/mandos/release : revision 237.2.182

9

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

10

*

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* Everything else is

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13

12

13

14

*

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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@recompile.se>.

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

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*/

31

32

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

53

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(), S_ISREG */

56

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

57

#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() */

64

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

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

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program_invocation_short_name */

67

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

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

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

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67

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

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68

SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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73

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

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74

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

76

75

setgid(), pause() */

77

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

76

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

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

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78

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

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79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

87

91

88

#ifdef __linux__

92

89

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

110

107

init_gnutls_session(),

111

108

GNUTLS_* */

112

109

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

115

112

116

113

/* GPGME */

117

114

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

125

122

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

126

123

#define SECKEY "seckey.txt"

127

124

#define PUBKEY "pubkey.txt"

128

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

129

125

130

126

bool debug = false;

131

127

static const char mandos_protocol_version[] = "1";

132

128

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

133

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

129

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

134

130

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

135

131

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

148

132

149

133

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

150

134

typedef struct {

155

139

gnutls_dh_params_t dh_params;

156

140

const char *priority;

157

141

gpgme_ctx_t ctx;

158

server *current_server;

159

142

} mandos_context;

160

143

161

144

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

162

145

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

163

146

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

147

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

166

148

167

149

sig_atomic_t quit_now = 0;

168

150

int signal_received = 0;

169

151

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

186

152

/*

187

153

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

188

154

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

189

155

* "buffer_length" is how much is already used.

190

156

*/

191

157

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

158

size_t buffer_capacity){

193

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

160

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

195

161

if(buffer == NULL){

200

166

return buffer_capacity;

201

167

}

202

168

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

240

169

/*

241

170

* Initialize GPGME.

242

171

*/

243

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

244

const char *tempdir){

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

245

174

gpgme_error_t rc;

246

175

gpgme_engine_info_t engine_info;

247

176

256

185

257

186

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

258

187

if(fd == -1){

259

perror_plus("open");

188

perror("open");

260

189

return false;

261

190

}

262

191

263

192

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

193

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

267

196

return false;

268

197

}

269

198

270

199

rc = gpgme_op_import(mc.ctx, pgp_data);

271

200

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

274

203

return false;

275

204

}

276

205

277

206

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

278

207

if(ret == -1){

279

perror_plus("close");

208

perror("close");

280

209

}

281

210

gpgme_data_release(pgp_data);

282

211

return true;

283

212

}

284

213

285

214

if(debug){

286

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

215

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

287

216

}

288

217

289

218

/* Init GPGME */

290

219

gpgme_check_version(NULL);

291

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

221

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

295

224

return false;

296

225

}

297

226

298

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

227

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

299

228

rc = gpgme_get_engine_info(&engine_info);

300

229

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

303

232

return false;

304

233

}

305

234

while(engine_info != NULL){

311

240

engine_info = engine_info->next;

312

241

}

313

242

if(engine_info == NULL){

314

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

315

tempdir);

243

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

316

244

return false;

317

245

}

318

246

319

247

/* Create new GPGME "context" */

320

248

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

321

249

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

325

252

return false;

326

253

}

327

254

346

273

ssize_t plaintext_length = 0;

347

274

348

275

if(debug){

349

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

276

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

350

277

}

351

278

352

279

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

353

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

281

0);

355

282

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

358

285

return -1;

359

286

}

360

287

361

288

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

362

289

rc = gpgme_data_new(&dh_plain);

363

290

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

367

293

gpgme_data_release(dh_crypto);

368

294

return -1;

369

295

}

372

298

data buffer */

373

299

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

374

300

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

377

303

plaintext_length = -1;

378

304

if(debug){

379

305

gpgme_decrypt_result_t result;

380

306

result = gpgme_op_decrypt_result(mc.ctx);

381

307

if(result == NULL){

382

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

308

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

383

309

} else {

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);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

388

314

if(result->file_name != NULL){

389

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

315

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

390

316

}

391

317

gpgme_recipient_t recipient;

392

318

recipient = result->recipients;

393

319

while(recipient != NULL){

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");

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");

401

326

recipient = recipient->next;

402

327

}

403

328

}

406

331

}

407

332

408

333

if(debug){

409

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

334

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

410

335

}

411

336

412

337

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

413

338

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

414

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

415

340

plaintext_length = -1;

416

341

goto decrypt_end;

417

342

}

419

344

*plaintext = NULL;

420

345

while(true){

421

346

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

424

349

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

428

353

}

429

354

430

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

360

break;

436

361

}

437

362

if(ret < 0){

438

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

439

364

plaintext_length = -1;

440

365

goto decrypt_end;

441

366

}

443

368

}

444

369

445

370

if(debug){

446

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

371

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

447

372

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

448

373

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

449

374

}

471

396

/* GnuTLS log function callback */

472

397

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

473

398

const char* string){

474

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

399

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

475

400

}

476

401

477

402

static int init_gnutls_global(const char *pubkeyfilename,

479

404

int ret;

480

405

481

406

if(debug){

482

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

407

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

483

408

}

484

409

485

410

ret = gnutls_global_init();

486

411

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

489

414

return -1;

490

415

}

491

416

498

423

}

499

424

500

425

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

502

427

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

505

433

gnutls_global_deinit();

506

434

return -1;

507

435

}

508

436

509

437

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

438

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

439

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

440

seckeyfilename);

514

441

}

515

442

516

443

ret = gnutls_certificate_set_openpgp_key_file

517

444

(mc.cred, pubkeyfilename, seckeyfilename,

518

445

GNUTLS_OPENPGP_FMT_BASE64);

519

446

if(ret != GNUTLS_E_SUCCESS){

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));

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));

525

452

goto globalfail;

526

453

}

527

454

528

455

/* GnuTLS server initialization */

529

456

ret = gnutls_dh_params_init(&mc.dh_params);

530

457

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

458

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

459

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

534

460

goto globalfail;

535

461

}

536

462

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

537

463

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

540

466

goto globalfail;

541

467

}

542

468

562

488

}

563

489

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

564

490

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

568

493

}

569

494

570

495

{

577

502

}

578

503

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

579

504

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

583

508

gnutls_deinit(*session);

584

509

return -1;

585

510

}

594

519

}

595

520

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

596

521

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

599

524

gnutls_deinit(*session);

600

525

return -1;

601

526

}

646

571

pf = PF_INET;

647

572

break;

648

573

default:

649

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

574

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

650

575

errno = EINVAL;

651

576

return -1;

652

577

}

657

582

}

658

583

659

584

if(debug){

660

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

661

PRIu16 "\n", ip, port);

585

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

586

"\n", ip, port);

662

587

}

663

588

664

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

590

if(tcp_sd < 0){

666

591

int e = errno;

667

perror_plus("socket");

592

perror("socket");

668

593

errno = e;

669

594

goto mandos_end;

670

595

}

684

609

}

685

610

if(ret < 0 ){

686

611

int e = errno;

687

perror_plus("inet_pton");

612

perror("inet_pton");

688

613

errno = e;

689

614

goto mandos_end;

690

615

}

691

616

if(ret == 0){

692

617

int e = errno;

693

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

618

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

694

619

errno = e;

695

620

goto mandos_end;

696

621

}

701

626

702

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

628

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

704

-Wunreachable-code*/

629

-Wunreachable-code*/

705

630

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

708

633

errno = EINVAL;

709

634

goto mandos_end;

710

635

}

726

651

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

727

652

char interface[IF_NAMESIZE];

728

653

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

729

perror_plus("if_indextoname");

654

perror("if_indextoname");

730

655

} else {

731

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

732

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

656

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

657

ip, interface, port);

733

658

}

734

659

} else {

735

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

736

ip, port);

660

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

661

port);

737

662

}

738

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

671

sizeof(addrstr));

747

672

}

748

673

if(pcret == NULL){

749

perror_plus("inet_ntop");

674

perror("inet_ntop");

750

675

} else {

751

676

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

752

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

677

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

753

678

}

754

679

}

755

680

}

765

690

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

766

691

}

767

692

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

693

int e = errno;

694

perror("connect");

695

errno = e;

773

696

goto mandos_end;

774

697

}

775

698

783

706

while(true){

784

707

size_t out_size = strlen(out);

785

708

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

786

out_size - written));

709

out_size - written));

787

710

if(ret == -1){

788

711

int e = errno;

789

perror_plus("write");

712

perror("write");

790

713

errno = e;

791

714

goto mandos_end;

792

715

}

809

732

}

810

733

811

734

if(debug){

812

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

735

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

813

736

}

814

737

815

738

if(quit_now){

817

740

goto mandos_end;

818

741

}

819

742

820

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

821

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

744

823

745

if(quit_now){

835

757

836

758

if(ret != GNUTLS_E_SUCCESS){

837

759

if(debug){

838

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

760

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

839

761

gnutls_perror(ret);

840

762

}

841

763

errno = EPROTO;

845

767

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

846

768

847

769

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

770

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

771

ip);

850

772

}

851

773

852

774

while(true){

857

779

}

858

780

859

781

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

782

buffer_capacity);

861

783

if(buffer_capacity == 0){

862

784

int e = errno;

863

perror_plus("incbuffer");

785

perror("incbuffer");

864

786

errno = e;

865

787

goto mandos_end;

866

788

}

890

812

}

891

813

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

892

814

if(ret < 0){

893

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

894

"***\n");

815

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

895

816

gnutls_perror(ret);

896

817

errno = EPROTO;

897

818

goto mandos_end;

898

819

}

899

820

break;

900

821

default:

901

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

902

" encrypted session with Mandos server\n");

822

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

823

" encrypted session with Mandos server\n");

903

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

825

errno = EIO;

905

826

goto mandos_end;

910

831

}

911

832

912

833

if(debug){

913

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

834

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

914

835

}

915

836

916

837

if(quit_now){

928

849

929

850

if(buffer_length > 0){

930

851

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

932

854

&decrypted_buffer);

933

855

if(decrypted_buffer_size >= 0){

934

856

945

867

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

946

868

int e = errno;

947

869

if(debug){

948

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

949

strerror(errno));

870

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

871

strerror(errno));

950

872

}

951

873

errno = e;

952

874

goto mandos_end;

971

893

if(e == 0){

972

894

e = errno;

973

895

}

974

perror_plus("close");

896

perror("close");

975

897

}

976

898

gnutls_deinit(session);

977

errno = e;

978

899

if(quit_now){

979

errno = EINTR;

900

e = EINTR;

980

901

retval = -1;

981

902

}

903

errno = e;

982

904

}

983

905

return retval;

984

906

}

1009

931

switch(event){

1010

932

default:

1011

933

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1016

937

break;

1017

938

1018

939

case AVAHI_RESOLVER_FOUND:

1020

941

char ip[AVAHI_ADDRESS_STR_MAX];

1021

942

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

1022

943

if(debug){

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);

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);

1026

947

}

1027

948

int ret = start_mandos_communication(ip, port, interface,

1028

949

avahi_proto_to_af(proto));

1029

950

if(ret == 0){

1030

951

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

952

}

1035

953

}

1036

954

}

1060

978

default:

1061

979

case AVAHI_BROWSER_FAILURE:

1062

980

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1065

983

avahi_simple_poll_quit(mc.simple_poll);

1066

984

return;

1067

985

1074

992

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

1075

993

name, type, domain, protocol, 0,

1076

994

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

995

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

996

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

1080

997

break;

1081

998

1082

999

case AVAHI_BROWSER_REMOVE:

1085

1002

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1003

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1004

if(debug){

1088

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

1089

" searching...\n");

1005

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

1090

1006

}

1091

1007

break;

1092

1008

}

1093

1009

}

1094

1010

1095

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

1011

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

1096

1012

static void handle_sigterm(int sig){

1097

1013

if(quit_now){

1098

1014

return;

1100

1016

quit_now = 1;

1101

1017

signal_received = sig;

1102

1018

int old_errno = errno;

1103

/* set main loop to exit */

1104

1019

if(mc.simple_poll != NULL){

1105

1020

avahi_simple_poll_quit(mc.simple_poll);

1106

1021

}

1107

1022

errno = old_errno;

1108

1023

}

1109

1024

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){

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){

1121

1079

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1080

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

1081

flagstring, if_entry->d_name);

1123

1082

}

1124

return false;

1083

free(flagstring);

1084

return 0;

1125

1085

}

1126

return true;

1127

}

1128

1129

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

1130

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

1088

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1089

if(flags & IFF_LOOPBACK){

1133

1090

if(debug){

1134

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

1135

ifname);

1091

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

1092

if_entry->d_name);

1136

1093

}

1137

return false;

1094

return 0;

1138

1095

}

1139

1096

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

1140

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

1097

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

1141

1098

if(debug){

1142

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

1143

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

1099

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

1100

if_entry->d_name);

1144

1101

}

1145

return true;

1102

return 1;

1146

1103

}

1147

1104

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

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

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

}

1164

1112

/* Accept this device */

1165

1113

if(debug){

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[i];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

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

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1479

1118

}

1480

1119

1481

1120

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

1500

1139

bool gnutls_initialized = false;

1501

1140

bool gpgme_initialized = false;

1502

1141

float delay = 2.5f;

1503

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

1504

retrying the same server again */

1505

1142

1506

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1507

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1513

1150

errno = 0;

1514

1151

ret = setgid(gid);

1515

1152

if(ret == -1){

1516

perror_plus("setgid");

1153

perror("setgid");

1517

1154

}

1518

1155

1519

1156

/* Lower user privileges (temporarily) */

1520

1157

errno = 0;

1521

1158

ret = seteuid(uid);

1522

1159

if(ret == -1){

1523

perror_plus("seteuid");

1160

perror("seteuid");

1524

1161

}

1525

1162

1526

1163

if(quit_now){

1561

1198

.arg = "SECONDS",

1562

1199

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

1563

1200

.group = 2 },

1564

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

1565

.arg = "SECONDS",

1566

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

1567

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

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

1571

.group = 2 },

1572

1201

/*

1573

1202

* These reproduce what we would get without ARGP_NO_HELP

1574

1203

*/

1618

1247

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

1619

1248

argp_error(state, "Bad delay");

1620

1249

}

1621

case 132: /* --retry */

1622

errno = 0;

1623

retry_interval = strtod(arg, &tmp);

1624

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

1625

or (retry_interval * 1000) > INT_MAX

1626

or retry_interval < 0){

1627

argp_error(state, "Bad retry interval");

1628

}

1629

break;

1630

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

1631

hookdir = arg;

1632

1250

break;

1633

1251

/*

1634

1252

* These reproduce what we would get without ARGP_NO_HELP

1641

1259

argp_state_help(state, state->out_stream,

1642

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1643

1261

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1262

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

1647

1263

exit(argp_err_exit_status);

1648

1264

break;

1649

1265

default:

1664

1280

case ENOMEM:

1665

1281

default:

1666

1282

errno = ret;

1667

perror_plus("argp_parse");

1283

perror("argp_parse");

1668

1284

exitcode = EX_OSERR;

1669

1285

goto end;

1670

1286

case EINVAL:

1672

1288

goto end;

1673

1289

}

1674

1290

}

1675

1676

if(getuid() == 0){

1677

/* Work around Debian bug #633582:

1678

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

1679

struct stat st;

1680

1681

/* Re-raise priviliges */

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

1735

}

1736

}

1737

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

1759

}

1760

1291

1761

1292

if(not debug){

1762

1293

avahi_set_log_function(empty_log);

1763

1294

}

1764

1295

1765

1296

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

1766

1297

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1769

1299

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

1300

if(ret >= 1){

1777

/* Pick the first interface returned */

1301

/* Pick the first good interface */

1778

1302

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

1779

1303

if(debug){

1780

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

1304

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

1781

1305

}

1782

1306

if(interface == NULL){

1783

perror_plus("malloc");

1307

perror("malloc");

1784

1308

free(direntries);

1785

1309

exitcode = EXIT_FAILURE;

1786

1310

goto end;

1788

1312

free(direntries);

1789

1313

} else {

1790

1314

free(direntries);

1791

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

1315

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

1792

1316

exitcode = EXIT_FAILURE;

1793

1317

goto end;

1794

1318

}

1800

1324

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

1801

1325

mc.simple_poll = avahi_simple_poll_new();

1802

1326

if(mc.simple_poll == NULL){

1803

fprintf_plus(stderr,

1804

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

1327

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

1805

1328

exitcode = EX_UNAVAILABLE;

1806

1329

goto end;

1807

1330

}

1809

1332

sigemptyset(&sigterm_action.sa_mask);

1810

1333

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

1811

1334

if(ret == -1){

1812

perror_plus("sigaddset");

1335

perror("sigaddset");

1813

1336

exitcode = EX_OSERR;

1814

1337

goto end;

1815

1338

}

1816

1339

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

1817

1340

if(ret == -1){

1818

perror_plus("sigaddset");

1341

perror("sigaddset");

1819

1342

exitcode = EX_OSERR;

1820

1343

goto end;

1821

1344

}

1822

1345

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

1823

1346

if(ret == -1){

1824

perror_plus("sigaddset");

1347

perror("sigaddset");

1825

1348

exitcode = EX_OSERR;

1826

1349

goto end;

1827

1350

}

1831

1354

*/

1832

1355

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

1833

1356

if(ret == -1){

1834

perror_plus("sigaction");

1357

perror("sigaction");

1835

1358

return EX_OSERR;

1836

1359

}

1837

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1838

1361

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

1839

1362

if(ret == -1){

1840

perror_plus("sigaction");

1363

perror("sigaction");

1841

1364

exitcode = EX_OSERR;

1842

1365

goto end;

1843

1366

}

1844

1367

}

1845

1368

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

1846

1369

if(ret == -1){

1847

perror_plus("sigaction");

1370

perror("sigaction");

1848

1371

return EX_OSERR;

1849

1372

}

1850

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

1374

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

1852

1375

if(ret == -1){

1853

perror_plus("sigaction");

1376

perror("sigaction");

1854

1377

exitcode = EX_OSERR;

1855

1378

goto end;

1856

1379

}

1857

1380

}

1858

1381

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

1859

1382

if(ret == -1){

1860

perror_plus("sigaction");

1383

perror("sigaction");

1861

1384

return EX_OSERR;

1862

1385

}

1863

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

1387

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

1865

1388

if(ret == -1){

1866

perror_plus("sigaction");

1389

perror("sigaction");

1867

1390

exitcode = EX_OSERR;

1868

1391

goto end;

1869

1392

}

1873

1396

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

1874

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

1398

if(if_index == 0){

1876

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

1399

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

1877

1400

exitcode = EX_UNAVAILABLE;

1878

1401

goto end;

1879

1402

}

1886

1409

errno = 0;

1887

1410

ret = seteuid(0);

1888

1411

if(ret == -1){

1889

perror_plus("seteuid");

1412

perror("seteuid");

1890

1413

}

1891

1414

1892

1415

#ifdef __linux__

1896

1419

bool restore_loglevel = true;

1897

1420

if(ret == -1){

1898

1421

restore_loglevel = false;

1899

perror_plus("klogctl");

1422

perror("klogctl");

1900

1423

}

1901

1424

#endif /* __linux__ */

1902

1425

1903

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1904

1427

if(sd < 0){

1905

perror_plus("socket");

1428

perror("socket");

1906

1429

exitcode = EX_OSERR;

1907

1430

#ifdef __linux__

1908

1431

if(restore_loglevel){

1909

1432

ret = klogctl(7, NULL, 0);

1910

1433

if(ret == -1){

1911

perror_plus("klogctl");

1434

perror("klogctl");

1912

1435

}

1913

1436

}

1914

1437

#endif /* __linux__ */

1916

1439

errno = 0;

1917

1440

ret = seteuid(uid);

1918

1441

if(ret == -1){

1919

perror_plus("seteuid");

1442

perror("seteuid");

1920

1443

}

1921

1444

goto end;

1922

1445

}

1923

1446

strcpy(network.ifr_name, interface);

1924

1447

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

1925

1448

if(ret == -1){

1926

perror_plus("ioctl SIOCGIFFLAGS");

1449

perror("ioctl SIOCGIFFLAGS");

1927

1450

#ifdef __linux__

1928

1451

if(restore_loglevel){

1929

1452

ret = klogctl(7, NULL, 0);

1930

1453

if(ret == -1){

1931

perror_plus("klogctl");

1454

perror("klogctl");

1932

1455

}

1933

1456

}

1934

1457

#endif /* __linux__ */

1937

1460

errno = 0;

1938

1461

ret = seteuid(uid);

1939

1462

if(ret == -1){

1940

perror_plus("seteuid");

1463

perror("seteuid");

1941

1464

}

1942

1465

goto end;

1943

1466

}

1947

1470

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

1948

1471

if(ret == -1){

1949

1472

take_down_interface = false;

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1951

1474

exitcode = EX_OSERR;

1952

1475

#ifdef __linux__

1953

1476

if(restore_loglevel){

1954

1477

ret = klogctl(7, NULL, 0);

1955

1478

if(ret == -1){

1956

perror_plus("klogctl");

1479

perror("klogctl");

1957

1480

}

1958

1481

}

1959

1482

#endif /* __linux__ */

1961

1484

errno = 0;

1962

1485

ret = seteuid(uid);

1963

1486

if(ret == -1){

1964

perror_plus("seteuid");

1487

perror("seteuid");

1965

1488

}

1966

1489

goto end;

1967

1490

}

1968

1491

}

1969

/* Sleep checking until interface is running.

1970

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

1492

/* sleep checking until interface is running */

1971

1493

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

1972

1494

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

1973

1495

if(ret == -1){

1974

perror_plus("ioctl SIOCGIFFLAGS");

1496

perror("ioctl SIOCGIFFLAGS");

1975

1497

} else if(network.ifr_flags & IFF_RUNNING){

1976

1498

break;

1977

1499

}

1978

1500

struct timespec sleeptime = { .tv_nsec = 250000000 };

1979

1501

ret = nanosleep(&sleeptime, NULL);

1980

1502

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

1981

perror_plus("nanosleep");

1503

perror("nanosleep");

1982

1504

}

1983

1505

}

1984

1506

if(not take_down_interface){

1985

1507

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

1986

1508

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

1987

1509

if(ret == -1){

1988

perror_plus("close");

1510

perror("close");

1989

1511

}

1990

1512

}

1991

1513

#ifdef __linux__

1993

1515

/* Restores kernel loglevel to default */

1994

1516

ret = klogctl(7, NULL, 0);

1995

1517

if(ret == -1){

1996

perror_plus("klogctl");

1518

perror("klogctl");

1997

1519

}

1998

1520

}

1999

1521

#endif /* __linux__ */

2000

1522

/* Lower privileges */

2001

1523

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

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

}

2006

1536

}

2007

1537

}

2008

1538

2012

1542

2013

1543

ret = init_gnutls_global(pubkey, seckey);

2014

1544

if(ret == -1){

2015

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

1545

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

2016

1546

exitcode = EX_UNAVAILABLE;

2017

1547

goto end;

2018

1548

} else {

2023

1553

goto end;

2024

1554

}

2025

1555

1556

tempdir_created = true;

2026

1557

if(mkdtemp(tempdir) == NULL){

2027

perror_plus("mkdtemp");

1558

tempdir_created = false;

1559

perror("mkdtemp");

2028

1560

goto end;

2029

1561

}

2030

tempdir_created = true;

2031

1562

2032

1563

if(quit_now){

2033

1564

goto end;

2034

1565

}

2035

1566

2036

1567

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

2037

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

1568

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

2038

1569

exitcode = EX_UNAVAILABLE;

2039

1570

goto end;

2040

1571

} else {

2050

1581

/* (Mainly meant for debugging) */

2051

1582

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

2052

1583

if(address == NULL){

2053

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

1584

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

2054

1585

exitcode = EX_USAGE;

2055

1586

goto end;

2056

1587

}

2064

1595

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

2065

1596

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

2066

1597

or tmpmax != (uint16_t)tmpmax){

2067

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

1598

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

2068

1599

exitcode = EX_USAGE;

2069

1600

goto end;

2070

1601

}

2075

1606

2076

1607

port = (uint16_t)tmpmax;

2077

1608

*address = '\0';

1609

address = connect_to;

2078

1610

/* Colon in address indicates IPv6 */

2079

1611

int af;

2080

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

1612

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

2081

1613

af = AF_INET6;

2082

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

2083

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

2084

{

2085

connect_to++;

2086

address[-1] = '\0';

2087

}

2088

1614

} else {

2089

1615

af = AF_INET;

2090

1616

}

2091

address = connect_to;

2092

1617

2093

1618

if(quit_now){

2094

1619

goto end;

2095

1620

}

2096

1621

2097

while(not quit_now){

2098

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

2099

if(quit_now or ret == 0){

2100

break;

2101

}

2102

if(debug){

2103

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

2104

(int)retry_interval);

2105

}

2106

sleep((int)retry_interval);

2107

}

2108

2109

if (not quit_now){

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 {

2110

1644

exitcode = EXIT_SUCCESS;

2111

1645

}

2112

2113

1646

goto end;

2114

1647

}

2115

1648

2137

1670

2138

1671

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

2139

1672

if(mc.server == NULL){

2140

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

2141

avahi_strerror(error));

1673

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

1674

avahi_strerror(error));

2142

1675

exitcode = EX_UNAVAILABLE;

2143

1676

goto end;

2144

1677

}

2152

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2153

1686

NULL, 0, browse_callback, NULL);

2154

1687

if(sb == NULL){

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2157

1690

exitcode = EX_UNAVAILABLE;

2158

1691

goto end;

2159

1692

}

2165

1698

/* Run the main loop */

2166

1699

2167

1700

if(debug){

2168

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

2169

}

2170

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2173

if(debug){

2174

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

2175

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

2176

}

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2177

1705

2178

1706

end:

2179

1707

2180

1708

if(debug){

2181

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

1709

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

2182

1710

}

2183

1711

2184

1712

/* Cleanup things */

2200

1728

if(gpgme_initialized){

2201

1729

gpgme_release(mc.ctx);

2202

1730

}

2203

2204

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

2205

has seen */

2206

if(mc.current_server != NULL){

2207

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

2208

while(mc.current_server != NULL){

2209

server *next = mc.current_server->next;

2210

free(mc.current_server);

2211

mc.current_server = next;

2212

}

2213

}

2214

1731

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1737

if(ret == -1){

1738

perror("seteuid");

1739

}

1740

if(geteuid() == 0){

2231

1741

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

2232

1742

if(ret == -1){

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2235

1745

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

2236

1746

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

2237

1747

if(ret == -1){

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2239

1749

}

2240

1750

}

2241

1751

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

2242

1752

if(ret == -1){

2243

perror_plus("close");

2244

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

1760

}

2253

1761

}

2254

1762

}

2255

1763

2256

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

1764

/* Removes the temp directory used by GPGME */

2257

1765

if(tempdir_created){

2258

struct dirent **direntries = NULL;

2259

struct dirent *direntry = NULL;

2260

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

2261

alphasort);

2262

if (numentries > 0){

2263

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

2264

direntry = direntries[i];

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

}

2265

1786

char *fullname = NULL;

2266

1787

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

2267

1788

direntry->d_name);

2268

1789

if(ret < 0){

2269

perror_plus("asprintf");

1790

perror("asprintf");

2270

1791

continue;

2271

1792

}

2272

1793

ret = remove(fullname);

2273

1794

if(ret == -1){

2274

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

2275

strerror(errno));

1795

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

1796

strerror(errno));

2276

1797

}

2277

1798

free(fullname);

2278

1799

}

2279

}

2280

2281

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

2282

free(direntries);

2283

if (numentries == -1){

2284

perror_plus("scandir");

1800

closedir(d);

2285

1801

}

2286

1802

ret = rmdir(tempdir);

2287

1803

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

2288

perror_plus("rmdir");

1804

perror("rmdir");

2289

1805

}

2290

1806

}

2291

1807

2296

1812

&old_sigterm_action,

2297

1813

NULL));

2298

1814

if(ret == -1){

2299

perror_plus("sigaction");

1815

perror("sigaction");

2300

1816

}

2301

1817

do {

2302

1818

ret = raise(signal_received);

2303

1819

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

2304

1820

if(ret != 0){

2305

perror_plus("raise");

1821

perror("raise");

2306

1822

abort();

2307

1823

}

2308

1824

TEMP_FAILURE_RETRY(pause());