/mandos/release : revision 237.16.10

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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

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* 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 */

56

#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() */

59

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

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

75

76

setgid(), pause() */

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

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

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argp_state, struct argp,

84

85

raise() */

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86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

107

110

init_gnutls_session(),

108

111

GNUTLS_* */

109

112

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

112

115

113

116

/* GPGME */

114

117

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

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struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

132

148

133

149

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

134

150

typedef struct {

139

155

gnutls_dh_params_t dh_params;

140

156

const char *priority;

141

157

gpgme_ctx_t ctx;

158

server *current_server;

142

159

} mandos_context;

143

160

144

161

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

145

162

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

146

163

.dh_bits = 1024, .priority = "SECURE256"

147

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

164

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

165

.current_server = NULL };

148

166

149

167

sig_atomic_t quit_now = 0;

150

168

int signal_received = 0;

151

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

152

186

/*

153

187

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

154

188

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

155

189

* "buffer_length" is how much is already used.

156

190

*/

157

191

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

192

size_t buffer_capacity){

159

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

194

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

161

195

if(buffer == NULL){

166

200

return buffer_capacity;

167

201

}

168

202

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

169

240

/*

170

241

* Initialize GPGME.

171

242

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

174

245

gpgme_error_t rc;

175

246

gpgme_engine_info_t engine_info;

176

247

185

256

186

257

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

187

258

if(fd == -1){

188

perror("open");

259

perror_plus("open");

189

260

return false;

190

261

}

191

262

192

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

264

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

196

267

return false;

197

268

}

198

269

199

270

rc = gpgme_op_import(mc.ctx, pgp_data);

200

271

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

203

274

return false;

204

275

}

205

276

206

277

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

207

278

if(ret == -1){

208

perror("close");

279

perror_plus("close");

209

280

}

210

281

gpgme_data_release(pgp_data);

211

282

return true;

212

283

}

213

284

214

285

if(debug){

215

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

286

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

216

287

}

217

288

218

289

/* Init GPGME */

219

290

gpgme_check_version(NULL);

220

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

292

if(rc != GPG_ERR_NO_ERROR){

222

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

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gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

224

295

return false;

225

296

}

226

297

227

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

298

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

228

299

rc = gpgme_get_engine_info(&engine_info);

229

300

if(rc != GPG_ERR_NO_ERROR){

230

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

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gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

232

303

return false;

233

304

}

234

305

while(engine_info != NULL){

240

311

engine_info = engine_info->next;

241

312

}

242

313

if(engine_info == NULL){

243

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

314

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

315

tempdir);

244

316

return false;

245

317

}

246

318

247

319

/* Create new GPGME "context" */

248

320

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

249

321

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

252

325

return false;

253

326

}

254

327

273

346

ssize_t plaintext_length = 0;

274

347

275

348

if(debug){

276

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

349

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

277

350

}

278

351

279

352

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

280

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

354

0);

282

355

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

285

358

return -1;

286

359

}

287

360

288

361

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

289

362

rc = gpgme_data_new(&dh_plain);

290

363

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

293

367

gpgme_data_release(dh_crypto);

294

368

return -1;

295

369

}

298

372

data buffer */

299

373

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

300

374

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

303

377

plaintext_length = -1;

304

378

if(debug){

305

379

gpgme_decrypt_result_t result;

306

380

result = gpgme_op_decrypt_result(mc.ctx);

307

381

if(result == NULL){

308

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

382

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

309

383

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

314

388

if(result->file_name != NULL){

315

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

389

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

316

390

}

317

391

gpgme_recipient_t recipient;

318

392

recipient = result->recipients;

319

393

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

326

401

recipient = recipient->next;

327

402

}

328

403

}

331

406

}

332

407

333

408

if(debug){

334

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

409

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

335

410

}

336

411

337

412

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

338

413

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

339

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

340

415

plaintext_length = -1;

341

416

goto decrypt_end;

342

417

}

344

419

*plaintext = NULL;

345

420

while(true){

346

421

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

349

424

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

353

428

}

354

429

355

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

435

break;

361

436

}

362

437

if(ret < 0){

363

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

364

439

plaintext_length = -1;

365

440

goto decrypt_end;

366

441

}

368

443

}

369

444

370

445

if(debug){

371

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

446

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

372

447

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

373

448

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

374

449

}

396

471

/* GnuTLS log function callback */

397

472

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

398

473

const char* string){

399

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

474

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

400

475

}

401

476

402

477

static int init_gnutls_global(const char *pubkeyfilename,

404

479

int ret;

405

480

406

481

if(debug){

407

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

482

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

408

483

}

409

484

410

485

ret = gnutls_global_init();

411

486

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

414

489

return -1;

415

490

}

416

491

423

498

}

424

499

425

500

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

502

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

433

505

gnutls_global_deinit();

434

506

return -1;

435

507

}

436

508

437

509

if(debug){

438

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

439

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

440

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

441

514

}

442

515

443

516

ret = gnutls_certificate_set_openpgp_key_file

444

517

(mc.cred, pubkeyfilename, seckeyfilename,

445

518

GNUTLS_OPENPGP_FMT_BASE64);

446

519

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

452

525

goto globalfail;

453

526

}

454

527

455

528

/* GnuTLS server initialization */

456

529

ret = gnutls_dh_params_init(&mc.dh_params);

457

530

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

460

534

goto globalfail;

461

535

}

462

536

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

463

537

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

466

540

goto globalfail;

467

541

}

468

542

488

562

}

489

563

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

490

564

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

493

568

}

494

569

495

570

{

502

577

}

503

578

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

504

579

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

580

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

581

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

582

safer_gnutls_strerror(ret));

508

583

gnutls_deinit(*session);

509

584

return -1;

510

585

}

519

594

}

520

595

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

521

596

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

524

599

gnutls_deinit(*session);

525

600

return -1;

526

601

}

571

646

pf = PF_INET;

572

647

break;

573

648

default:

574

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

649

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

575

650

errno = EINVAL;

576

651

return -1;

577

652

}

582

657

}

583

658

584

659

if(debug){

585

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

586

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

587

662

}

588

663

589

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

665

if(tcp_sd < 0){

591

666

int e = errno;

592

perror("socket");

667

perror_plus("socket");

593

668

errno = e;

594

669

goto mandos_end;

595

670

}

609

684

}

610

685

if(ret < 0 ){

611

686

int e = errno;

612

perror("inet_pton");

687

perror_plus("inet_pton");

613

688

errno = e;

614

689

goto mandos_end;

615

690

}

616

691

if(ret == 0){

617

692

int e = errno;

618

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

693

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

619

694

errno = e;

620

695

goto mandos_end;

621

696

}

626

701

627

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

703

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

629

-Wunreachable-code*/

704

-Wunreachable-code*/

630

705

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

633

708

errno = EINVAL;

634

709

goto mandos_end;

635

710

}

651

726

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

652

727

char interface[IF_NAMESIZE];

653

728

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

654

perror("if_indextoname");

729

perror_plus("if_indextoname");

655

730

} else {

656

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

657

ip, interface, port);

731

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

732

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

658

733

}

659

734

} else {

660

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

661

port);

735

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

736

ip, port);

662

737

}

663

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

746

sizeof(addrstr));

672

747

}

673

748

if(pcret == NULL){

674

perror("inet_ntop");

749

perror_plus("inet_ntop");

675

750

} else {

676

751

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

677

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

752

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

678

753

}

679

754

}

680

755

}

690

765

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

691

766

}

692

767

if(ret < 0){

693

int e = errno;

694

perror("connect");

695

errno = e;

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

696

773

goto mandos_end;

697

774

}

698

775

706

783

while(true){

707

784

size_t out_size = strlen(out);

708

785

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

709

out_size - written));

786

out_size - written));

710

787

if(ret == -1){

711

788

int e = errno;

712

perror("write");

789

perror_plus("write");

713

790

errno = e;

714

791

goto mandos_end;

715

792

}

732

809

}

733

810

734

811

if(debug){

735

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

812

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

736

813

}

737

814

738

815

if(quit_now){

740

817

goto mandos_end;

741

818

}

742

819

820

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

743

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

744

822

745

823

if(quit_now){

757

835

758

836

if(ret != GNUTLS_E_SUCCESS){

759

837

if(debug){

760

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

838

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

761

839

gnutls_perror(ret);

762

840

}

763

841

errno = EPROTO;

767

845

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

768

846

769

847

if(debug){

770

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

771

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

772

850

}

773

851

774

852

while(true){

779

857

}

780

858

781

859

buffer_capacity = incbuffer(&buffer, buffer_length,

782

buffer_capacity);

860

buffer_capacity);

783

861

if(buffer_capacity == 0){

784

862

int e = errno;

785

perror("incbuffer");

863

perror_plus("incbuffer");

786

864

errno = e;

787

865

goto mandos_end;

788

866

}

812

890

}

813

891

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

814

892

if(ret < 0){

815

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

893

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

894

"***\n");

816

895

gnutls_perror(ret);

817

896

errno = EPROTO;

818

897

goto mandos_end;

819

898

}

820

899

break;

821

900

default:

822

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

823

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

824

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

904

errno = EIO;

826

905

goto mandos_end;

831

910

}

832

911

833

912

if(debug){

834

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

913

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

835

914

}

836

915

837

916

if(quit_now){

849

928

850

929

if(buffer_length > 0){

851

930

ssize_t decrypted_buffer_size;

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

854

932

&decrypted_buffer);

855

933

if(decrypted_buffer_size >= 0){

856

934

867

945

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

868

946

int e = errno;

869

947

if(debug){

870

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

871

strerror(errno));

948

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

949

strerror(errno));

872

950

}

873

951

errno = e;

874

952

goto mandos_end;

893

971

if(e == 0){

894

972

e = errno;

895

973

}

896

perror("close");

974

perror_plus("close");

897

975

}

898

976

gnutls_deinit(session);

977

errno = e;

899

978

if(quit_now){

900

e = EINTR;

979

errno = EINTR;

901

980

retval = -1;

902

981

}

903

errno = e;

904

982

}

905

983

return retval;

906

984

}

931

1009

switch(event){

932

1010

default:

933

1011

case AVAHI_RESOLVER_FAILURE:

934

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

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

937

1016

break;

938

1017

939

1018

case AVAHI_RESOLVER_FOUND:

941

1020

char ip[AVAHI_ADDRESS_STR_MAX];

942

1021

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

943

1022

if(debug){

944

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

945

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

946

ip, (intmax_t)interface, port);

1023

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

1024

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

1025

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

947

1026

}

948

1027

int ret = start_mandos_communication(ip, port, interface,

949

1028

avahi_proto_to_af(proto));

950

1029

if(ret == 0){

951

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

952

1034

}

953

1035

}

954

1036

}

978

1060

default:

979

1061

case AVAHI_BROWSER_FAILURE:

980

1062

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

983

1065

avahi_simple_poll_quit(mc.simple_poll);

984

1066

return;

985

1067

992

1074

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

993

1075

name, type, domain, protocol, 0,

994

1076

resolve_callback, NULL) == NULL)

995

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

996

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

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

997

1080

break;

998

1081

999

1082

case AVAHI_BROWSER_REMOVE:

1002

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1003

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1004

1087

if(debug){

1005

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

1088

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

1089

" searching...\n");

1006

1090

}

1007

1091

break;

1008

1092

}

1009

1093

}

1010

1094

1011

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

1095

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

1012

1096

static void handle_sigterm(int sig){

1013

1097

if(quit_now){

1014

1098

return;

1016

1100

quit_now = 1;

1017

1101

signal_received = sig;

1018

1102

int old_errno = errno;

1103

/* set main loop to exit */

1019

1104

if(mc.simple_poll != NULL){

1020

1105

avahi_simple_poll_quit(mc.simple_poll);

1021

1106

}

1022

1107

errno = old_errno;

1023

1108

}

1024

1109

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

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

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

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

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

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

1048

/* read line from flags_fd */

1049

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

1050

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

1051

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

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

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

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

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

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1079

1121

if(debug){

1080

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

1081

flagstring, if_entry->d_name);

1122

perror_plus("ioctl SIOCGIFFLAGS");

1082

1123

}

1083

free(flagstring);

1084

return 0;

1124

return false;

1085

1125

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1126

return true;

1127

}

1128

1129

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

1130

1088

1131

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1090

1133

if(debug){

1091

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

1092

if_entry->d_name);

1134

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

1135

ifname);

1093

1136

}

1094

return 0;

1137

return false;

1095

1138

}

1096

1139

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

1097

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

1140

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

1098

1141

if(debug){

1099

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

1100

if_entry->d_name);

1142

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

1143

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

1101

1144

}

1102

return 1;

1145

return true;

1103

1146

}

1104

1147

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

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1112

1164

/* Accept this device */

1113

1165

if(debug){

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1436

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1118

1475

}

1119

1476

1120

1477

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

1139

1496

bool gnutls_initialized = false;

1140

1497

bool gpgme_initialized = false;

1141

1498

float delay = 2.5f;

1499

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

1500

retrying the same server again */

1142

1501

1143

1502

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1144

1503

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1150

1509

errno = 0;

1151

1510

ret = setgid(gid);

1152

1511

if(ret == -1){

1153

perror("setgid");

1512

perror_plus("setgid");

1154

1513

}

1155

1514

1156

1515

/* Lower user privileges (temporarily) */

1157

1516

errno = 0;

1158

1517

ret = seteuid(uid);

1159

1518

if(ret == -1){

1160

perror("seteuid");

1519

perror_plus("seteuid");

1161

1520

}

1162

1521

1163

1522

if(quit_now){

1198

1557

.arg = "SECONDS",

1199

1558

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

1200

1559

.group = 2 },

1560

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

1561

.arg = "SECONDS",

1562

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

1563

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1201

1568

/*

1202

1569

* These reproduce what we would get without ARGP_NO_HELP

1203

1570

*/

1247

1614

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

1248

1615

argp_error(state, "Bad delay");

1249

1616

}

1617

case 132: /* --retry */

1618

errno = 0;

1619

retry_interval = strtod(arg, &tmp);

1620

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

1621

or (retry_interval * 1000) > INT_MAX

1622

or retry_interval < 0){

1623

argp_error(state, "Bad retry interval");

1624

}

1625

break;

1626

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

1627

hookdir = arg;

1250

1628

break;

1251

1629

/*

1252

1630

* These reproduce what we would get without ARGP_NO_HELP

1259

1637

argp_state_help(state, state->out_stream,

1260

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

1639

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

1262

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1263

1643

exit(argp_err_exit_status);

1264

1644

break;

1265

1645

default:

1280

1660

case ENOMEM:

1281

1661

default:

1282

1662

errno = ret;

1283

perror("argp_parse");

1663

perror_plus("argp_parse");

1284

1664

exitcode = EX_OSERR;

1285

1665

goto end;

1286

1666

case EINVAL:

1288

1668

goto end;

1289

1669

}

1290

1670

}

1671

1672

{

1673

/* Work around Debian bug #633582:

1674

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

}

1732

}

1733

1734

/* Run network hooks */

1735

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

1751

}

1291

1752

1292

1753

if(not debug){

1293

1754

avahi_set_log_function(empty_log);

1294

1755

}

1295

1756

1296

1757

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

1297

1758

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1299

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1300

1768

if(ret >= 1){

1301

/* Pick the first good interface */

1769

/* Pick the first interface returned */

1302

1770

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

1303

1771

if(debug){

1304

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

1772

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

1305

1773

}

1306

1774

if(interface == NULL){

1307

perror("malloc");

1775

perror_plus("malloc");

1308

1776

free(direntries);

1309

1777

exitcode = EXIT_FAILURE;

1310

1778

goto end;

1312

1780

free(direntries);

1313

1781

} else {

1314

1782

free(direntries);

1315

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

1783

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

1316

1784

exitcode = EXIT_FAILURE;

1317

1785

goto end;

1318

1786

}

1324

1792

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

1325

1793

mc.simple_poll = avahi_simple_poll_new();

1326

1794

if(mc.simple_poll == NULL){

1327

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

1795

fprintf_plus(stderr,

1796

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

1328

1797

exitcode = EX_UNAVAILABLE;

1329

1798

goto end;

1330

1799

}

1332

1801

sigemptyset(&sigterm_action.sa_mask);

1333

1802

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

1334

1803

if(ret == -1){

1335

perror("sigaddset");

1804

perror_plus("sigaddset");

1336

1805

exitcode = EX_OSERR;

1337

1806

goto end;

1338

1807

}

1339

1808

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

1340

1809

if(ret == -1){

1341

perror("sigaddset");

1810

perror_plus("sigaddset");

1342

1811

exitcode = EX_OSERR;

1343

1812

goto end;

1344

1813

}

1345

1814

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

1346

1815

if(ret == -1){

1347

perror("sigaddset");

1816

perror_plus("sigaddset");

1348

1817

exitcode = EX_OSERR;

1349

1818

goto end;

1350

1819

}

1354

1823

*/

1355

1824

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

1356

1825

if(ret == -1){

1357

perror("sigaction");

1826

perror_plus("sigaction");

1358

1827

return EX_OSERR;

1359

1828

}

1360

1829

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

1830

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

1362

1831

if(ret == -1){

1363

perror("sigaction");

1832

perror_plus("sigaction");

1364

1833

exitcode = EX_OSERR;

1365

1834

goto end;

1366

1835

}

1367

1836

}

1368

1837

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

1369

1838

if(ret == -1){

1370

perror("sigaction");

1839

perror_plus("sigaction");

1371

1840

return EX_OSERR;

1372

1841

}

1373

1842

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

1843

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

1375

1844

if(ret == -1){

1376

perror("sigaction");

1845

perror_plus("sigaction");

1377

1846

exitcode = EX_OSERR;

1378

1847

goto end;

1379

1848

}

1380

1849

}

1381

1850

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

1382

1851

if(ret == -1){

1383

perror("sigaction");

1852

perror_plus("sigaction");

1384

1853

return EX_OSERR;

1385

1854

}

1386

1855

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

1856

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

1388

1857

if(ret == -1){

1389

perror("sigaction");

1858

perror_plus("sigaction");

1390

1859

exitcode = EX_OSERR;

1391

1860

goto end;

1392

1861

}

1396

1865

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

1397

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

1867

if(if_index == 0){

1399

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

1868

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

1400

1869

exitcode = EX_UNAVAILABLE;

1401

1870

goto end;

1402

1871

}

1409

1878

errno = 0;

1410

1879

ret = seteuid(0);

1411

1880

if(ret == -1){

1412

perror("seteuid");

1881

perror_plus("seteuid");

1413

1882

}

1414

1883

1415

1884

#ifdef __linux__

1419

1888

bool restore_loglevel = true;

1420

1889

if(ret == -1){

1421

1890

restore_loglevel = false;

1422

perror("klogctl");

1891

perror_plus("klogctl");

1423

1892

}

1424

1893

#endif /* __linux__ */

1425

1894

1426

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1427

1896

if(sd < 0){

1428

perror("socket");

1897

perror_plus("socket");

1429

1898

exitcode = EX_OSERR;

1430

1899

#ifdef __linux__

1431

1900

if(restore_loglevel){

1432

1901

ret = klogctl(7, NULL, 0);

1433

1902

if(ret == -1){

1434

perror("klogctl");

1903

perror_plus("klogctl");

1435

1904

}

1436

1905

}

1437

1906

#endif /* __linux__ */

1439

1908

errno = 0;

1440

1909

ret = seteuid(uid);

1441

1910

if(ret == -1){

1442

perror("seteuid");

1911

perror_plus("seteuid");

1443

1912

}

1444

1913

goto end;

1445

1914

}

1446

1915

strcpy(network.ifr_name, interface);

1447

1916

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

1448

1917

if(ret == -1){

1449

perror("ioctl SIOCGIFFLAGS");

1918

perror_plus("ioctl SIOCGIFFLAGS");

1450

1919

#ifdef __linux__

1451

1920

if(restore_loglevel){

1452

1921

ret = klogctl(7, NULL, 0);

1453

1922

if(ret == -1){

1454

perror("klogctl");

1923

perror_plus("klogctl");

1455

1924

}

1456

1925

}

1457

1926

#endif /* __linux__ */

1460

1929

errno = 0;

1461

1930

ret = seteuid(uid);

1462

1931

if(ret == -1){

1463

perror("seteuid");

1932

perror_plus("seteuid");

1464

1933

}

1465

1934

goto end;

1466

1935

}

1470

1939

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

1471

1940

if(ret == -1){

1472

1941

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1474

1943

exitcode = EX_OSERR;

1475

1944

#ifdef __linux__

1476

1945

if(restore_loglevel){

1477

1946

ret = klogctl(7, NULL, 0);

1478

1947

if(ret == -1){

1479

perror("klogctl");

1948

perror_plus("klogctl");

1480

1949

}

1481

1950

}

1482

1951

#endif /* __linux__ */

1484

1953

errno = 0;

1485

1954

ret = seteuid(uid);

1486

1955

if(ret == -1){

1487

perror("seteuid");

1956

perror_plus("seteuid");

1488

1957

}

1489

1958

goto end;

1490

1959

}

1491

1960

}

1492

/* sleep checking until interface is running */

1961

/* Sleep checking until interface is running.

1962

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

1493

1963

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

1494

1964

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

1495

1965

if(ret == -1){

1496

perror("ioctl SIOCGIFFLAGS");

1966

perror_plus("ioctl SIOCGIFFLAGS");

1497

1967

} else if(network.ifr_flags & IFF_RUNNING){

1498

1968

break;

1499

1969

}

1500

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1501

1971

ret = nanosleep(&sleeptime, NULL);

1502

1972

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

1503

perror("nanosleep");

1973

perror_plus("nanosleep");

1504

1974

}

1505

1975

}

1506

1976

if(not take_down_interface){

1507

1977

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

1508

1978

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

1509

1979

if(ret == -1){

1510

perror("close");

1980

perror_plus("close");

1511

1981

}

1512

1982

}

1513

1983

#ifdef __linux__

1515

1985

/* Restores kernel loglevel to default */

1516

1986

ret = klogctl(7, NULL, 0);

1517

1987

if(ret == -1){

1518

perror("klogctl");

1988

perror_plus("klogctl");

1519

1989

}

1520

1990

}

1521

1991

#endif /* __linux__ */

1522

1992

/* Lower privileges */

1523

1993

errno = 0;

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1536

1998

}

1537

1999

}

1538

2000

1542

2004

1543

2005

ret = init_gnutls_global(pubkey, seckey);

1544

2006

if(ret == -1){

1545

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

2007

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

1546

2008

exitcode = EX_UNAVAILABLE;

1547

2009

goto end;

1548

2010

} else {

1553

2015

goto end;

1554

2016

}

1555

2017

2018

if(mkdtemp(tempdir) == NULL){

2019

perror_plus("mkdtemp");

2020

goto end;

2021

}

1556

2022

tempdir_created = true;

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1559

perror("mkdtemp");

1560

goto end;

1561

}

1562

2023

1563

2024

if(quit_now){

1564

2025

goto end;

1565

2026

}

1566

2027

1567

2028

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

1568

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

2029

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

1569

2030

exitcode = EX_UNAVAILABLE;

1570

2031

goto end;

1571

2032

} else {

1581

2042

/* (Mainly meant for debugging) */

1582

2043

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

1583

2044

if(address == NULL){

1584

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

2045

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

1585

2046

exitcode = EX_USAGE;

1586

2047

goto end;

1587

2048

}

1595

2056

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

1596

2057

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

1597

2058

or tmpmax != (uint16_t)tmpmax){

1598

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

2059

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

1599

2060

exitcode = EX_USAGE;

1600

2061

goto end;

1601

2062

}

1606

2067

1607

2068

port = (uint16_t)tmpmax;

1608

2069

*address = '\0';

1609

address = connect_to;

1610

2070

/* Colon in address indicates IPv6 */

1611

2071

int af;

1612

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

2072

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

1613

2073

af = AF_INET6;

2074

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

2075

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

2076

{

2077

connect_to++;

2078

address[-1] = '\0';

2079

}

1614

2080

} else {

1615

2081

af = AF_INET;

1616

2082

}

2083

address = connect_to;

1617

2084

1618

2085

if(quit_now){

1619

2086

goto end;

1620

2087

}

1621

2088

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1643

} else {

2089

while(not quit_now){

2090

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

2091

if(quit_now or ret == 0){

2092

break;

2093

}

2094

if(debug){

2095

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

2096

(int)retry_interval);

2097

}

2098

sleep((int)retry_interval);

2099

}

2100

2101

if (not quit_now){

1644

2102

exitcode = EXIT_SUCCESS;

1645

2103

}

2104

1646

2105

goto end;

1647

2106

}

1648

2107

1670

2129

1671

2130

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

1672

2131

if(mc.server == NULL){

1673

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

1674

avahi_strerror(error));

2132

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

2133

avahi_strerror(error));

1675

2134

exitcode = EX_UNAVAILABLE;

1676

2135

goto end;

1677

2136

}

1685

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

2145

NULL, 0, browse_callback, NULL);

1687

2146

if(sb == NULL){

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

1690

2149

exitcode = EX_UNAVAILABLE;

1691

2150

goto end;

1692

2151

}

1698

2157

/* Run the main loop */

1699

2158

1700

2159

if(debug){

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2160

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

2161

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2165

if(debug){

2166

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

2167

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

2168

}

1705

2169

1706

2170

end:

1707

2171

1708

2172

if(debug){

1709

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

2173

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

1710

2174

}

1711

2175

1712

2176

/* Cleanup things */

1728

2192

if(gpgme_initialized){

1729

2193

gpgme_release(mc.ctx);

1730

2194

}

2195

2196

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

2197

has seen */

2198

if(mc.current_server != NULL){

2199

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

2200

while(mc.current_server != NULL){

2201

server *next = mc.current_server->next;

2202

free(mc.current_server);

2203

mc.current_server = next;

2204

}

2205

}

1731

2206

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2207

/* Re-raise priviliges */

2208

{

1735

2209

errno = 0;

1736

2210

ret = seteuid(0);

1737

2211

if(ret == -1){

1738

perror("seteuid");

1739

}

1740

if(geteuid() == 0){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

1741

2221

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

1742

2222

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

1745

2225

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

1746

2226

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

1747

2227

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

2229

}

1750

2230

}

1751

2231

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

1752

2232

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2233

perror_plus("close");

1760

2234

}

1761

2235

}

1762

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

1763

2243

1764

/* Removes the temp directory used by GPGME */

2244

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

1765

2245

if(tempdir_created){

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

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

1782

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

1783

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

1784

continue;

1785

}

2246

struct dirent **direntries = NULL;

2247

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

2252

direntry = direntries[i];

1786

2253

char *fullname = NULL;

1787

2254

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

1788

2255

direntry->d_name);

1789

2256

if(ret < 0){

1790

perror("asprintf");

2257

perror_plus("asprintf");

1791

2258

continue;

1792

2259

}

1793

2260

ret = remove(fullname);

1794

2261

if(ret == -1){

1795

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

1796

strerror(errno));

2262

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

2263

strerror(errno));

1797

2264

}

1798

2265

free(fullname);

1799

2266

}

1800

closedir(d);

2267

}

2268

2269

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

2270

free(direntries);

2271

if (numentries == -1){

2272

perror_plus("scandir");

1801

2273

}

1802

2274

ret = rmdir(tempdir);

1803

2275

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

1804

perror("rmdir");

2276

perror_plus("rmdir");

1805

2277

}

1806

2278

}

1807

2279

1812

2284

&old_sigterm_action,

1813

2285

NULL));

1814

2286

if(ret == -1){

1815

perror("sigaction");

2287

perror_plus("sigaction");

1816

2288

}

1817

2289

do {

1818

2290

ret = raise(signal_received);

1819

2291

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

1820

2292

if(ret != 0){

1821

perror("raise");

2293

perror_plus("raise");

1822

2294

abort();

1823

2295

}

1824

2296

TEMP_FAILURE_RETRY(pause());