/mandos/release : revision 237.11.25

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

10

*

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* Everything else is

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*

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

16

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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73

*/

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

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

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setgid(), pause() */

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

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

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

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

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79

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

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80

argp_state, struct argp,

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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(),

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WEXITSTATUS(), WTERMSIG() */

90

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

87

91

88

92

#ifdef __linux__

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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(),

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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"

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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>";

135

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

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;

130

149

131

150

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

132

151

typedef struct {

137

156

gnutls_dh_params_t dh_params;

138

157

const char *priority;

139

158

gpgme_ctx_t ctx;

159

server *current_server;

140

160

} mandos_context;

141

161

142

162

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

143

163

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

144

164

.dh_bits = 1024, .priority = "SECURE256"

145

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

165

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

166

.current_server = NULL };

146

167

147

168

sig_atomic_t quit_now = 0;

148

169

int signal_received = 0;

149

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

150

187

/*

151

188

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

152

189

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

153

190

* "buffer_length" is how much is already used.

154

191

*/

155

192

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

193

size_t buffer_capacity){

157

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

195

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

159

196

if(buffer == NULL){

164

201

return buffer_capacity;

165

202

}

166

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

167

241

/*

168

242

* Initialize GPGME.

169

243

*/

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

172

246

gpgme_error_t rc;

173

247

gpgme_engine_info_t engine_info;

174

248

183

257

184

258

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

185

259

if(fd == -1){

186

perror("open");

260

perror_plus("open");

187

261

return false;

188

262

}

189

263

190

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

265

if(rc != GPG_ERR_NO_ERROR){

192

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

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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));

194

268

return false;

195

269

}

196

270

197

271

rc = gpgme_op_import(mc.ctx, pgp_data);

198

272

if(rc != GPG_ERR_NO_ERROR){

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

201

275

return false;

202

276

}

203

277

204

278

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

205

279

if(ret == -1){

206

perror("close");

280

perror_plus("close");

207

281

}

208

282

gpgme_data_release(pgp_data);

209

283

return true;

210

284

}

211

285

212

286

if(debug){

213

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

287

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

214

288

}

215

289

216

290

/* Init GPGME */

217

291

gpgme_check_version(NULL);

218

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

293

if(rc != GPG_ERR_NO_ERROR){

220

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

221

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));

222

296

return false;

223

297

}

224

298

225

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

299

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

226

300

rc = gpgme_get_engine_info(&engine_info);

227

301

if(rc != GPG_ERR_NO_ERROR){

228

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

229

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));

230

304

return false;

231

305

}

232

306

while(engine_info != NULL){

238

312

engine_info = engine_info->next;

239

313

}

240

314

if(engine_info == NULL){

241

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);

242

317

return false;

243

318

}

244

319

245

320

/* Create new GPGME "context" */

246

321

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

247

322

if(rc != GPG_ERR_NO_ERROR){

248

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

249

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));

250

326

return false;

251

327

}

252

328

271

347

ssize_t plaintext_length = 0;

272

348

273

349

if(debug){

274

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

350

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

275

351

}

276

352

277

353

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

278

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

355

0);

280

356

if(rc != GPG_ERR_NO_ERROR){

281

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

282

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));

283

359

return -1;

284

360

}

285

361

286

362

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

287

363

rc = gpgme_data_new(&dh_plain);

288

364

if(rc != GPG_ERR_NO_ERROR){

289

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

290

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));

291

368

gpgme_data_release(dh_crypto);

292

369

return -1;

293

370

}

296

373

data buffer */

297

374

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

298

375

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

301

378

plaintext_length = -1;

302

379

if(debug){

303

380

gpgme_decrypt_result_t result;

304

381

result = gpgme_op_decrypt_result(mc.ctx);

305

382

if(result == NULL){

306

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

383

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

307

384

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

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);

312

389

if(result->file_name != NULL){

313

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

390

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

314

391

}

315

392

gpgme_recipient_t recipient;

316

393

recipient = result->recipients;

317

394

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "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");

324

402

recipient = recipient->next;

325

403

}

326

404

}

329

407

}

330

408

331

409

if(debug){

332

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

410

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

333

411

}

334

412

335

413

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

336

414

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

337

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

338

416

plaintext_length = -1;

339

417

goto decrypt_end;

340

418

}

342

420

*plaintext = NULL;

343

421

while(true){

344

422

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

347

425

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

351

429

}

352

430

353

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

436

break;

359

437

}

360

438

if(ret < 0){

361

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

362

440

plaintext_length = -1;

363

441

goto decrypt_end;

364

442

}

366

444

}

367

445

368

446

if(debug){

369

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

447

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

370

448

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

371

449

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

372

450

}

394

472

/* GnuTLS log function callback */

395

473

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

396

474

const char* string){

397

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

475

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

398

476

}

399

477

400

478

static int init_gnutls_global(const char *pubkeyfilename,

402

480

int ret;

403

481

404

482

if(debug){

405

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

483

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

406

484

}

407

485

408

486

ret = gnutls_global_init();

409

487

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

412

490

return -1;

413

491

}

414

492

421

499

}

422

500

423

501

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

503

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

431

506

gnutls_global_deinit();

432

507

return -1;

433

508

}

434

509

435

510

if(debug){

436

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

437

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

438

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);

439

515

}

440

516

441

517

ret = gnutls_certificate_set_openpgp_key_file

442

518

(mc.cred, pubkeyfilename, seckeyfilename,

443

519

GNUTLS_OPENPGP_FMT_BASE64);

444

520

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

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));

450

526

goto globalfail;

451

527

}

452

528

453

529

/* GnuTLS server initialization */

454

530

ret = gnutls_dh_params_init(&mc.dh_params);

455

531

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

458

535

goto globalfail;

459

536

}

460

537

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

461

538

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

464

541

goto globalfail;

465

542

}

466

543

486

563

}

487

564

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

488

565

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

491

569

}

492

570

493

571

{

500

578

}

501

579

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

502

580

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

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));

506

584

gnutls_deinit(*session);

507

585

return -1;

508

586

}

517

595

}

518

596

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

519

597

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

522

600

gnutls_deinit(*session);

523

601

return -1;

524

602

}

569

647

pf = PF_INET;

570

648

break;

571

649

default:

572

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

650

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

573

651

errno = EINVAL;

574

652

return -1;

575

653

}

580

658

}

581

659

582

660

if(debug){

583

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

584

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

585

663

}

586

664

587

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

666

if(tcp_sd < 0){

589

667

int e = errno;

590

perror("socket");

668

perror_plus("socket");

591

669

errno = e;

592

670

goto mandos_end;

593

671

}

607

685

}

608

686

if(ret < 0 ){

609

687

int e = errno;

610

perror("inet_pton");

688

perror_plus("inet_pton");

611

689

errno = e;

612

690

goto mandos_end;

613

691

}

614

692

if(ret == 0){

615

693

int e = errno;

616

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

694

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

617

695

errno = e;

618

696

goto mandos_end;

619

697

}

624

702

625

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

704

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

627

-Wunreachable-code*/

705

-Wunreachable-code*/

628

706

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

631

709

errno = EINVAL;

632

710

goto mandos_end;

633

711

}

649

727

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

650

728

char interface[IF_NAMESIZE];

651

729

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

652

perror("if_indextoname");

730

perror_plus("if_indextoname");

653

731

} else {

654

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

655

ip, interface, port);

732

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

733

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

656

734

}

657

735

} else {

658

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

659

port);

736

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

737

ip, port);

660

738

}

661

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

669

747

sizeof(addrstr));

670

748

}

671

749

if(pcret == NULL){

672

perror("inet_ntop");

750

perror_plus("inet_ntop");

673

751

} else {

674

752

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

675

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

753

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

676

754

}

677

755

}

678

756

}

688

766

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

689

767

}

690

768

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

694

774

goto mandos_end;

695

775

}

696

776

704

784

while(true){

705

785

size_t out_size = strlen(out);

706

786

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

707

out_size - written));

787

out_size - written));

708

788

if(ret == -1){

709

789

int e = errno;

710

perror("write");

790

perror_plus("write");

711

791

errno = e;

712

792

goto mandos_end;

713

793

}

730

810

}

731

811

732

812

if(debug){

733

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

813

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

734

814

}

735

815

736

816

if(quit_now){

738

818

goto mandos_end;

739

819

}

740

820

821

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

741

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

823

743

824

if(quit_now){

755

836

756

837

if(ret != GNUTLS_E_SUCCESS){

757

838

if(debug){

758

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

839

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

759

840

gnutls_perror(ret);

760

841

}

761

842

errno = EPROTO;

765

846

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

766

847

767

848

if(debug){

768

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

769

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

770

851

}

771

852

772

853

while(true){

777

858

}

778

859

779

860

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

861

buffer_capacity);

781

862

if(buffer_capacity == 0){

782

863

int e = errno;

783

perror("incbuffer");

864

perror_plus("incbuffer");

784

865

errno = e;

785

866

goto mandos_end;

786

867

}

810

891

}

811

892

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

812

893

if(ret < 0){

813

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

894

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

895

"***\n");

814

896

gnutls_perror(ret);

815

897

errno = EPROTO;

816

898

goto mandos_end;

817

899

}

818

900

break;

819

901

default:

820

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

821

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

822

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

905

errno = EIO;

824

906

goto mandos_end;

829

911

}

830

912

831

913

if(debug){

832

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

914

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

833

915

}

834

916

835

917

if(quit_now){

847

929

848

930

if(buffer_length > 0){

849

931

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

852

933

&decrypted_buffer);

853

934

if(decrypted_buffer_size >= 0){

854

935

865

946

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

866

947

int e = errno;

867

948

if(debug){

868

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

869

strerror(errno));

949

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

950

strerror(errno));

870

951

}

871

952

errno = e;

872

953

goto mandos_end;

891

972

if(e == 0){

892

973

e = errno;

893

974

}

894

perror("close");

975

perror_plus("close");

895

976

}

896

977

gnutls_deinit(session);

978

errno = e;

897

979

if(quit_now){

898

e = EINTR;

980

errno = EINTR;

899

981

retval = -1;

900

982

}

901

errno = e;

902

983

}

903

984

return retval;

904

985

}

929

1010

switch(event){

930

1011

default:

931

1012

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

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)));

935

1017

break;

936

1018

937

1019

case AVAHI_RESOLVER_FOUND:

939

1021

char ip[AVAHI_ADDRESS_STR_MAX];

940

1022

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

941

1023

if(debug){

942

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

943

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

944

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);

945

1027

}

946

1028

int ret = start_mandos_communication(ip, port, interface,

947

1029

avahi_proto_to_af(proto));

948

1030

if(ret == 0){

949

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

950

1035

}

951

1036

}

952

1037

}

976

1061

default:

977

1062

case AVAHI_BROWSER_FAILURE:

978

1063

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

981

1066

avahi_simple_poll_quit(mc.simple_poll);

982

1067

return;

983

1068

990

1075

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

991

1076

name, type, domain, protocol, 0,

992

1077

resolve_callback, NULL) == NULL)

993

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

994

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)));

995

1081

break;

996

1082

997

1083

case AVAHI_BROWSER_REMOVE:

1000

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1088

if(debug){

1003

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

1089

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

1090

" searching...\n");

1004

1091

}

1005

1092

break;

1006

1093

}

1007

1094

}

1008

1095

1009

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

1096

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

1010

1097

static void handle_sigterm(int sig){

1011

1098

if(quit_now){

1012

1099

return;

1014

1101

quit_now = 1;

1015

1102

signal_received = sig;

1016

1103

int old_errno = errno;

1104

/* set main loop to exit */

1017

1105

if(mc.simple_poll != NULL){

1018

1106

avahi_simple_poll_quit(mc.simple_poll);

1019

1107

}

1020

1108

errno = old_errno;

1021

1109

}

1022

1110

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){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

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

1165

/* Accept this device */

1166

if(debug){

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

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1023

1511

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

1024

1512

AvahiSServiceBrowser *sb = NULL;

1025

1513

int error;

1027

1515

intmax_t tmpmax;

1028

1516

char *tmp;

1029

1517

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1518

const char *interface = "";

1031

1519

struct ifreq network;

1032

1520

int sd = -1;

1033

1521

bool take_down_interface = false;

1034

1522

uid_t uid;

1035

1523

gid_t gid;

1036

char *connect_to = NULL;

1037

1524

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

1038

1525

bool tempdir_created = false;

1039

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1043

1530

bool gnutls_initialized = false;

1044

1531

bool gpgme_initialized = false;

1045

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

1046

1535

1047

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1543

errno = 0;

1055

1544

ret = setgid(gid);

1056

1545

if(ret == -1){

1057

perror("setgid");

1546

perror_plus("setgid");

1058

1547

}

1059

1548

1060

1549

/* Lower user privileges (temporarily) */

1061

1550

errno = 0;

1062

1551

ret = seteuid(uid);

1063

1552

if(ret == -1){

1064

perror("seteuid");

1553

perror_plus("seteuid");

1065

1554

}

1066

1555

1067

1556

if(quit_now){

1102

1591

.arg = "SECONDS",

1103

1592

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

1104

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1105

1602

/*

1106

1603

* These reproduce what we would get without ARGP_NO_HELP

1107

1604

*/

1151

1648

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

1152

1649

argp_error(state, "Bad delay");

1153

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1154

1662

break;

1155

1663

/*

1156

1664

* These reproduce what we would get without ARGP_NO_HELP

1163

1671

argp_state_help(state, state->out_stream,

1164

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

1673

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

1166

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1167

1677

exit(argp_err_exit_status);

1168

1678

break;

1169

1679

default:

1184

1694

case ENOMEM:

1185

1695

default:

1186

1696

errno = ret;

1187

perror("argp_parse");

1697

perror_plus("argp_parse");

1188

1698

exitcode = EX_OSERR;

1189

1699

goto end;

1190

1700

case EINVAL:

1192

1702

goto end;

1193

1703

}

1194

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1772

}

1195

1773

1196

1774

if(not debug){

1197

1775

avahi_set_log_function(empty_log);

1198

1776

}

1199

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1200

1810

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

1201

1811

from the signal handler */

1202

1812

/* Initialize the pseudo-RNG for Avahi */

1203

1813

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

1204

1814

mc.simple_poll = avahi_simple_poll_new();

1205

1815

if(mc.simple_poll == NULL){

1206

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

1816

fprintf_plus(stderr,

1817

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

1207

1818

exitcode = EX_UNAVAILABLE;

1208

1819

goto end;

1209

1820

}

1211

1822

sigemptyset(&sigterm_action.sa_mask);

1212

1823

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

1213

1824

if(ret == -1){

1214

perror("sigaddset");

1825

perror_plus("sigaddset");

1215

1826

exitcode = EX_OSERR;

1216

1827

goto end;

1217

1828

}

1218

1829

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

1219

1830

if(ret == -1){

1220

perror("sigaddset");

1831

perror_plus("sigaddset");

1221

1832

exitcode = EX_OSERR;

1222

1833

goto end;

1223

1834

}

1224

1835

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

1225

1836

if(ret == -1){

1226

perror("sigaddset");

1837

perror_plus("sigaddset");

1227

1838

exitcode = EX_OSERR;

1228

1839

goto end;

1229

1840

}

1233

1844

*/

1234

1845

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

1235

1846

if(ret == -1){

1236

perror("sigaction");

1847

perror_plus("sigaction");

1237

1848

return EX_OSERR;

1238

1849

}

1239

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1851

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

1241

1852

if(ret == -1){

1242

perror("sigaction");

1853

perror_plus("sigaction");

1243

1854

exitcode = EX_OSERR;

1244

1855

goto end;

1245

1856

}

1246

1857

}

1247

1858

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

1248

1859

if(ret == -1){

1249

perror("sigaction");

1860

perror_plus("sigaction");

1250

1861

return EX_OSERR;

1251

1862

}

1252

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1864

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

1254

1865

if(ret == -1){

1255

perror("sigaction");

1866

perror_plus("sigaction");

1256

1867

exitcode = EX_OSERR;

1257

1868

goto end;

1258

1869

}

1259

1870

}

1260

1871

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

1261

1872

if(ret == -1){

1262

perror("sigaction");

1873

perror_plus("sigaction");

1263

1874

return EX_OSERR;

1264

1875

}

1265

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1877

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

1267

1878

if(ret == -1){

1268

perror("sigaction");

1879

perror_plus("sigaction");

1269

1880

exitcode = EX_OSERR;

1270

1881

goto end;

1271

1882

}

1272

1883

}

1273

1884

1274

1885

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

1275

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

1886

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

1276

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1888

if(if_index == 0){

1278

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

1889

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

1279

1890

exitcode = EX_UNAVAILABLE;

1280

1891

goto end;

1281

1892

}

1288

1899

errno = 0;

1289

1900

ret = seteuid(0);

1290

1901

if(ret == -1){

1291

perror("seteuid");

1902

perror_plus("seteuid");

1292

1903

}

1293

1904

1294

1905

#ifdef __linux__

1298

1909

bool restore_loglevel = true;

1299

1910

if(ret == -1){

1300

1911

restore_loglevel = false;

1301

perror("klogctl");

1912

perror_plus("klogctl");

1302

1913

}

1303

1914

#endif /* __linux__ */

1304

1915

1305

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1917

if(sd < 0){

1307

perror("socket");

1918

perror_plus("socket");

1308

1919

exitcode = EX_OSERR;

1309

1920

#ifdef __linux__

1310

1921

if(restore_loglevel){

1311

1922

ret = klogctl(7, NULL, 0);

1312

1923

if(ret == -1){

1313

perror("klogctl");

1924

perror_plus("klogctl");

1314

1925

}

1315

1926

}

1316

1927

#endif /* __linux__ */

1318

1929

errno = 0;

1319

1930

ret = seteuid(uid);

1320

1931

if(ret == -1){

1321

perror("seteuid");

1932

perror_plus("seteuid");

1322

1933

}

1323

1934

goto end;

1324

1935

}

1325

1936

strcpy(network.ifr_name, interface);

1326

1937

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

1327

1938

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1329

1940

#ifdef __linux__

1330

1941

if(restore_loglevel){

1331

1942

ret = klogctl(7, NULL, 0);

1332

1943

if(ret == -1){

1333

perror("klogctl");

1944

perror_plus("klogctl");

1334

1945

}

1335

1946

}

1336

1947

#endif /* __linux__ */

1339

1950

errno = 0;

1340

1951

ret = seteuid(uid);

1341

1952

if(ret == -1){

1342

perror("seteuid");

1953

perror_plus("seteuid");

1343

1954

}

1344

1955

goto end;

1345

1956

}

1349

1960

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

1350

1961

if(ret == -1){

1351

1962

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1353

1964

exitcode = EX_OSERR;

1354

1965

#ifdef __linux__

1355

1966

if(restore_loglevel){

1356

1967

ret = klogctl(7, NULL, 0);

1357

1968

if(ret == -1){

1358

perror("klogctl");

1969

perror_plus("klogctl");

1359

1970

}

1360

1971

}

1361

1972

#endif /* __linux__ */

1363

1974

errno = 0;

1364

1975

ret = seteuid(uid);

1365

1976

if(ret == -1){

1366

perror("seteuid");

1977

perror_plus("seteuid");

1367

1978

}

1368

1979

goto end;

1369

1980

}

1370

1981

}

1371

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1372

1984

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

1373

1985

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

1374

1986

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1376

1988

} else if(network.ifr_flags & IFF_RUNNING){

1377

1989

break;

1378

1990

}

1379

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

1992

ret = nanosleep(&sleeptime, NULL);

1381

1993

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

1382

perror("nanosleep");

1994

perror_plus("nanosleep");

1383

1995

}

1384

1996

}

1385

1997

if(not take_down_interface){

1386

1998

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

1387

1999

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

1388

2000

if(ret == -1){

1389

perror("close");

2001

perror_plus("close");

1390

2002

}

1391

2003

}

1392

2004

#ifdef __linux__

1394

2006

/* Restores kernel loglevel to default */

1395

2007

ret = klogctl(7, NULL, 0);

1396

2008

if(ret == -1){

1397

perror("klogctl");

2009

perror_plus("klogctl");

1398

2010

}

1399

2011

}

1400

2012

#endif /* __linux__ */

1401

2013

/* Lower privileges */

1402

2014

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1415

2019

}

1416

2020

}

1417

2021

1421

2025

1422

2026

ret = init_gnutls_global(pubkey, seckey);

1423

2027

if(ret == -1){

1424

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

2028

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

1425

2029

exitcode = EX_UNAVAILABLE;

1426

2030

goto end;

1427

2031

} else {

1432

2036

goto end;

1433

2037

}

1434

2038

2039

if(mkdtemp(tempdir) == NULL){

2040

perror_plus("mkdtemp");

2041

goto end;

2042

}

1435

2043

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

1439

goto end;

1440

}

1441

2044

1442

2045

if(quit_now){

1443

2046

goto end;

1444

2047

}

1445

2048

1446

2049

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

1447

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

2050

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

1448

2051

exitcode = EX_UNAVAILABLE;

1449

2052

goto end;

1450

2053

} else {

1460

2063

/* (Mainly meant for debugging) */

1461

2064

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

1462

2065

if(address == NULL){

1463

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

2066

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

1464

2067

exitcode = EX_USAGE;

1465

2068

goto end;

1466

2069

}

1474

2077

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

1475

2078

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

1476

2079

or tmpmax != (uint16_t)tmpmax){

1477

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

2080

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

1478

2081

exitcode = EX_USAGE;

1479

2082

goto end;

1480

2083

}

1485

2088

1486

2089

port = (uint16_t)tmpmax;

1487

2090

*address = '\0';

1488

address = connect_to;

1489

2091

/* Colon in address indicates IPv6 */

1490

2092

int af;

1491

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

2093

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

1492

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1493

2101

} else {

1494

2102

af = AF_INET;

1495

2103

}

2104

address = connect_to;

1496

2105

1497

2106

if(quit_now){

1498

2107

goto end;

1499

2108

}

1500

2109

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1523

2123

exitcode = EXIT_SUCCESS;

1524

2124

}

2125

1525

2126

goto end;

1526

2127

}

1527

2128

1549

2150

1550

2151

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

1551

2152

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2153

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

2154

avahi_strerror(error));

1554

2155

exitcode = EX_UNAVAILABLE;

1555

2156

goto end;

1556

2157

}

1564

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

2166

NULL, 0, browse_callback, NULL);

1566

2167

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

1569

2170

exitcode = EX_UNAVAILABLE;

1570

2171

goto end;

1571

2172

}

1577

2178

/* Run the main loop */

1578

2179

1579

2180

if(debug){

1580

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

1581

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1584

2190

1585

2191

end:

1586

2192

1587

2193

if(debug){

1588

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

2194

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

1589

2195

}

1590

2196

1591

2197

/* Cleanup things */

1608

2214

gpgme_release(mc.ctx);

1609

2215

}

1610

2216

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

1614

2233

errno = 0;

1615

2234

ret = seteuid(0);

1616

2235

if(ret == -1){

1617

perror("seteuid");

2236

perror_plus("seteuid");

1618

2237

}

1619

if(geteuid() == 0){

2238

2239

/* Take down the network interface */

2240

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

1620

2241

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

1621

2242

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

1624

2245

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

1625

2246

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

1626

2247

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1628

2249

}

1629

2250

}

1630

2251

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

1631

2252

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

2253

perror_plus("close");

1639

2254

}

1640

2255

}

1641

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

1642

2263

1643

/* Removes the temp directory used by GPGME */

2264

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

1644

2265

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1665

2273

char *fullname = NULL;

1666

2274

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

1667

2275

direntry->d_name);

1668

2276

if(ret < 0){

1669

perror("asprintf");

2277

perror_plus("asprintf");

1670

2278

continue;

1671

2279

}

1672

2280

ret = remove(fullname);

1673

2281

if(ret == -1){

1674

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

1675

strerror(errno));

2282

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

2283

strerror(errno));

1676

2284

}

1677

2285

free(fullname);

1678

2286

}

1679

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1680

2293

}

1681

2294

ret = rmdir(tempdir);

1682

2295

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

1683

perror("rmdir");

2296

perror_plus("rmdir");

1684

2297

}

1685

2298

}

1686

2299

1691

2304

&old_sigterm_action,

1692

2305

NULL));

1693

2306

if(ret == -1){

1694

perror("sigaction");

2307

perror_plus("sigaction");

1695

2308

}

1696

2309

do {

1697

2310

ret = raise(signal_received);

1698

2311

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

1699

2312

if(ret != 0){

1700

perror("raise");

2313

perror_plus("raise");

1701

2314

abort();

1702

2315

}

1703

2316

TEMP_FAILURE_RETRY(pause());