/mandos/release : revision 237.7.81

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

26

* 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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*/

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() */

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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() */

64

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

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

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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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73

*/

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74

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

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75

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

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setgid(), pause() */

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

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

77

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

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78

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

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79

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

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argp_state, struct argp,

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

87

91

88

92

#ifdef __linux__

89

93

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

107

111

init_gnutls_session(),

108

112

GNUTLS_* */

109

113

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

117

/* GPGME */

114

118

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

122

126

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

123

127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

129

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

125

130

126

131

bool debug = false;

127

132

static const char mandos_protocol_version[] = "1";

128

133

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

129

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

134

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

130

135

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

131

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

143

AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

132

149

133

150

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

134

151

typedef struct {

139

156

gnutls_dh_params_t dh_params;

140

157

const char *priority;

141

158

gpgme_ctx_t ctx;

159

server *current_server;

142

160

} mandos_context;

143

161

144

162

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

145

163

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

146

164

.dh_bits = 1024, .priority = "SECURE256"

147

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

165

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

166

.current_server = NULL };

148

167

149

168

sig_atomic_t quit_now = 0;

150

169

int signal_received = 0;

151

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

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

180

va_list ap;

181

va_start (ap, format);

182

183

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

184

program_invocation_short_name));

185

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

186

}

187

152

188

/*

153

189

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

154

190

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

155

191

* "buffer_length" is how much is already used.

156

192

*/

157

193

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

194

size_t buffer_capacity){

159

195

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

196

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

161

197

if(buffer == NULL){

166

202

return buffer_capacity;

167

203

}

168

204

205

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

206

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

207

int af){

208

int ret;

209

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

210

if(new_server == NULL){

211

perror_plus("malloc");

212

return false;

213

}

214

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

215

.port = port,

216

.if_index = if_index,

217

.af = af };

218

if(new_server->ip == NULL){

219

perror_plus("strdup");

220

return false;

221

}

222

/* Special case of first server */

223

if (mc.current_server == NULL){

224

new_server->next = new_server;

225

new_server->prev = new_server;

226

mc.current_server = new_server;

227

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

228

} else {

229

new_server->next = mc.current_server;

230

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

231

new_server->prev->next = new_server;

232

mc.current_server->prev = new_server;

233

}

234

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

238

}

239

return true;

240

}

241

169

242

/*

170

243

* Initialize GPGME.

171

244

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

245

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

246

const char *tempdir){

174

247

gpgme_error_t rc;

175

248

gpgme_engine_info_t engine_info;

176

249

185

258

186

259

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

187

260

if(fd == -1){

188

perror("open");

261

perror_plus("open");

189

262

return false;

190

263

}

191

264

192

265

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

266

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));

267

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

268

gpgme_strsource(rc), gpgme_strerror(rc));

196

269

return false;

197

270

}

198

271

199

272

rc = gpgme_op_import(mc.ctx, pgp_data);

200

273

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

274

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

275

gpgme_strsource(rc), gpgme_strerror(rc));

203

276

return false;

204

277

}

205

278

206

279

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

207

280

if(ret == -1){

208

perror("close");

281

perror_plus("close");

209

282

}

210

283

gpgme_data_release(pgp_data);

211

284

return true;

212

285

}

213

286

214

287

if(debug){

215

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

288

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

216

289

}

217

290

218

291

/* Init GPGME */

219

292

gpgme_check_version(NULL);

220

293

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

294

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

295

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

296

gpgme_strsource(rc), gpgme_strerror(rc));

224

297

return false;

225

298

}

226

299

227

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

300

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

228

301

rc = gpgme_get_engine_info(&engine_info);

229

302

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

232

305

return false;

233

306

}

234

307

while(engine_info != NULL){

240

313

engine_info = engine_info->next;

241

314

}

242

315

if(engine_info == NULL){

243

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

316

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

317

tempdir);

244

318

return false;

245

319

}

246

320

247

321

/* Create new GPGME "context" */

248

322

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

249

323

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

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

326

gpgme_strerror(rc));

252

327

return false;

253

328

}

254

329

273

348

ssize_t plaintext_length = 0;

274

349

275

350

if(debug){

276

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

351

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

277

352

}

278

353

279

354

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

280

355

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

356

0);

282

357

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));

358

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

359

gpgme_strsource(rc), gpgme_strerror(rc));

285

360

return -1;

286

361

}

287

362

288

363

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

289

364

rc = gpgme_data_new(&dh_plain);

290

365

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

366

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

367

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

368

gpgme_strsource(rc), gpgme_strerror(rc));

293

369

gpgme_data_release(dh_crypto);

294

370

return -1;

295

371

}

298

374

data buffer */

299

375

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

300

376

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

303

379

plaintext_length = -1;

304

380

if(debug){

305

381

gpgme_decrypt_result_t result;

306

382

result = gpgme_op_decrypt_result(mc.ctx);

307

383

if(result == NULL){

308

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

384

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

309

385

} 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);

386

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

387

result->unsupported_algorithm);

388

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

389

result->wrong_key_usage);

314

390

if(result->file_name != NULL){

315

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

391

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

316

392

}

317

393

gpgme_recipient_t recipient;

318

394

recipient = result->recipients;

319

395

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");

396

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

397

gpgme_pubkey_algo_name

398

(recipient->pubkey_algo));

399

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

400

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

401

recipient->status == GPG_ERR_NO_SECKEY

402

? "No" : "Yes");

326

403

recipient = recipient->next;

327

404

}

328

405

}

331

408

}

332

409

333

410

if(debug){

334

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

411

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

335

412

}

336

413

337

414

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

338

415

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

339

perror("gpgme_data_seek");

416

perror_plus("gpgme_data_seek");

340

417

plaintext_length = -1;

341

418

goto decrypt_end;

342

419

}

344

421

*plaintext = NULL;

345

422

while(true){

346

423

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

424

(size_t)plaintext_length,

425

plaintext_capacity);

349

426

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

427

perror_plus("incbuffer");

428

plaintext_length = -1;

429

goto decrypt_end;

353

430

}

354

431

355

432

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

437

break;

361

438

}

362

439

if(ret < 0){

363

perror("gpgme_data_read");

440

perror_plus("gpgme_data_read");

364

441

plaintext_length = -1;

365

442

goto decrypt_end;

366

443

}

368

445

}

369

446

370

447

if(debug){

371

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

448

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

372

449

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

373

450

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

374

451

}

396

473

/* GnuTLS log function callback */

397

474

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

398

475

const char* string){

399

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

476

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

400

477

}

401

478

402

479

static int init_gnutls_global(const char *pubkeyfilename,

404

481

int ret;

405

482

406

483

if(debug){

407

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

484

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

408

485

}

409

486

410

487

ret = gnutls_global_init();

411

488

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

414

491

return -1;

415

492

}

416

493

423

500

}

424

501

425

502

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

504

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));

505

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

506

safer_gnutls_strerror(ret));

433

507

gnutls_global_deinit();

434

508

return -1;

435

509

}

436

510

437

511

if(debug){

438

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

439

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

440

seckeyfilename);

512

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

513

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

514

pubkeyfilename,

515

seckeyfilename);

441

516

}

442

517

443

518

ret = gnutls_certificate_set_openpgp_key_file

444

519

(mc.cred, pubkeyfilename, seckeyfilename,

445

520

GNUTLS_OPENPGP_FMT_BASE64);

446

521

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));

522

fprintf_plus(stderr,

523

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

524

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

525

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

526

safer_gnutls_strerror(ret));

452

527

goto globalfail;

453

528

}

454

529

455

530

/* GnuTLS server initialization */

456

531

ret = gnutls_dh_params_init(&mc.dh_params);

457

532

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

" initialization: %s\n",

535

safer_gnutls_strerror(ret));

460

536

goto globalfail;

461

537

}

462

538

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

463

539

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

540

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

541

safer_gnutls_strerror(ret));

466

542

goto globalfail;

467

543

}

468

544

488

564

}

489

565

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

490

566

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

567

fprintf_plus(stderr,

568

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

569

safer_gnutls_strerror(ret));

493

570

}

494

571

495

572

{

502

579

}

503

580

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

504

581

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));

582

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

583

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

584

safer_gnutls_strerror(ret));

508

585

gnutls_deinit(*session);

509

586

return -1;

510

587

}

519

596

}

520

597

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

521

598

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

599

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

600

safer_gnutls_strerror(ret));

524

601

gnutls_deinit(*session);

525

602

return -1;

526

603

}

571

648

pf = PF_INET;

572

649

break;

573

650

default:

574

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

651

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

575

652

errno = EINVAL;

576

653

return -1;

577

654

}

582

659

}

583

660

584

661

if(debug){

585

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

586

"\n", ip, port);

662

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

663

PRIu16 "\n", ip, port);

587

664

}

588

665

589

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

667

if(tcp_sd < 0){

591

668

int e = errno;

592

perror("socket");

669

perror_plus("socket");

593

670

errno = e;

594

671

goto mandos_end;

595

672

}

609

686

}

610

687

if(ret < 0 ){

611

688

int e = errno;

612

perror("inet_pton");

689

perror_plus("inet_pton");

613

690

errno = e;

614

691

goto mandos_end;

615

692

}

616

693

if(ret == 0){

617

694

int e = errno;

618

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

695

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

619

696

errno = e;

620

697

goto mandos_end;

621

698

}

626

703

627

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

705

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

629

-Wunreachable-code*/

706

-Wunreachable-code*/

630

707

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

708

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

709

" incomplete without a network interface\n");

633

710

errno = EINVAL;

634

711

goto mandos_end;

635

712

}

651

728

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

652

729

char interface[IF_NAMESIZE];

653

730

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

654

perror("if_indextoname");

731

perror_plus("if_indextoname");

655

732

} else {

656

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

657

ip, interface, port);

733

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

734

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

658

735

}

659

736

} else {

660

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

661

port);

737

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

738

ip, port);

662

739

}

663

740

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

741

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

748

sizeof(addrstr));

672

749

}

673

750

if(pcret == NULL){

674

perror("inet_ntop");

751

perror_plus("inet_ntop");

675

752

} else {

676

753

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

677

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

754

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

678

755

}

679

756

}

680

757

}

692

769

if(ret < 0){

693

770

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

694

771

int e = errno;

695

perror("connect");

772

perror_plus("connect");

696

773

errno = e;

697

774

}

698

775

goto mandos_end;

708

785

while(true){

709

786

size_t out_size = strlen(out);

710

787

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

711

out_size - written));

788

out_size - written));

712

789

if(ret == -1){

713

790

int e = errno;

714

perror("write");

791

perror_plus("write");

715

792

errno = e;

716

793

goto mandos_end;

717

794

}

734

811

}

735

812

736

813

if(debug){

737

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

814

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

738

815

}

739

816

740

817

if(quit_now){

742

819

goto mandos_end;

743

820

}

744

821

822

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

745

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

824

747

825

if(quit_now){

759

837

760

838

if(ret != GNUTLS_E_SUCCESS){

761

839

if(debug){

762

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

840

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

763

841

gnutls_perror(ret);

764

842

}

765

843

errno = EPROTO;

769

847

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

770

848

771

849

if(debug){

772

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

773

ip);

850

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

851

" %s\n", ip);

774

852

}

775

853

776

854

while(true){

781

859

}

782

860

783

861

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

862

buffer_capacity);

785

863

if(buffer_capacity == 0){

786

864

int e = errno;

787

perror("incbuffer");

865

perror_plus("incbuffer");

788

866

errno = e;

789

867

goto mandos_end;

790

868

}

814

892

}

815

893

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

816

894

if(ret < 0){

817

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

895

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

896

"***\n");

818

897

gnutls_perror(ret);

819

898

errno = EPROTO;

820

899

goto mandos_end;

821

900

}

822

901

break;

823

902

default:

824

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

825

" encrypted session with Mandos server\n");

903

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

904

" encrypted session with Mandos server\n");

826

905

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

906

errno = EIO;

828

907

goto mandos_end;

833

912

}

834

913

835

914

if(debug){

836

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

915

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

837

916

}

838

917

839

918

if(quit_now){

851

930

852

931

if(buffer_length > 0){

853

932

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

934

&decrypted_buffer);

857

935

if(decrypted_buffer_size >= 0){

858

936

869

947

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

870

948

int e = errno;

871

949

if(debug){

872

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

873

strerror(errno));

950

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

951

strerror(errno));

874

952

}

875

953

errno = e;

876

954

goto mandos_end;

895

973

if(e == 0){

896

974

e = errno;

897

975

}

898

perror("close");

976

perror_plus("close");

899

977

}

900

978

gnutls_deinit(session);

979

errno = e;

901

980

if(quit_now){

902

e = EINTR;

981

errno = EINTR;

903

982

retval = -1;

904

983

}

905

errno = e;

906

984

}

907

985

return retval;

908

986

}

933

1011

switch(event){

934

1012

default:

935

1013

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1014

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

1015

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

1016

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

939

1018

break;

940

1019

941

1020

case AVAHI_RESOLVER_FOUND:

943

1022

char ip[AVAHI_ADDRESS_STR_MAX];

944

1023

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

945

1024

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1025

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

1026

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

1027

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

949

1028

}

950

1029

int ret = start_mandos_communication(ip, port, interface,

951

1030

avahi_proto_to_af(proto));

952

1031

if(ret == 0){

953

1032

avahi_simple_poll_quit(mc.simple_poll);

1033

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1036

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

1037

" list\n", name);

1038

}

954

1039

}

955

1040

}

956

1041

}

980

1065

default:

981

1066

case AVAHI_BROWSER_FAILURE:

982

1067

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1068

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

985

1070

avahi_simple_poll_quit(mc.simple_poll);

986

1071

return;

987

1072

994

1079

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

995

1080

name, type, domain, protocol, 0,

996

1081

resolve_callback, NULL) == NULL)

997

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

998

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

1082

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

1083

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

999

1085

break;

1000

1086

1001

1087

case AVAHI_BROWSER_REMOVE:

1004

1090

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1091

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1092

if(debug){

1007

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

1093

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

1094

" searching...\n");

1008

1095

}

1009

1096

break;

1010

1097

}

1011

1098

}

1012

1099

1013

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

1100

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

1014

1101

static void handle_sigterm(int sig){

1015

1102

if(quit_now){

1016

1103

return;

1018

1105

quit_now = 1;

1019

1106

signal_received = sig;

1020

1107

int old_errno = errno;

1108

/* set main loop to exit */

1021

1109

if(mc.simple_poll != NULL){

1022

1110

avahi_simple_poll_quit(mc.simple_poll);

1023

1111

}

1024

1112

errno = old_errno;

1025

1113

}

1026

1114

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1115

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

1116

int ret;

1117

1118

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

1119

if(s < 0){

1120

perror_plus("socket");

1121

return false;

1122

}

1123

strcpy(ifr->ifr_name, ifname);

1124

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

if(ret == -1){

1081

1126

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1127

perror_plus("ioctl SIOCGIFFLAGS");

1084

1128

}

1085

free(flagstring);

1086

return 0;

1129

return false;

1087

1130

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

return true;

1132

}

1133

1134

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

1135

1090

1136

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1137

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1138

if(debug){

1093

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

1094

if_entry->d_name);

1139

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

1140

ifname);

1095

1141

}

1096

return 0;

1142

return false;

1097

1143

}

1098

1144

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

1099

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

1145

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

1100

1146

if(debug){

1101

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

1102

if_entry->d_name);

1147

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

1148

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

1103

1149

}

1104

return 1;

1150

return true;

1105

1151

}

1106

1152

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1153

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

1154

if(debug){

1155

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1156

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

1157

}

1158

return false;

1159

}

1160

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

1161

if(ifr->ifr_flags & IFF_NOARP){

1162

if(debug){

1163

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

1164

ifname);

1165

}

1166

return false;

1167

}

1168

1114

1169

/* Accept this device */

1115

1170

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1171

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

1172

}

1173

return true;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device.

1179

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

1180

*/

1181

int good_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

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

1191

}

1192

return 0;

1193

}

1194

1195

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

1196

return 0;

1197

}

1198

return 1;

1199

}

1200

1201

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1244

int notdotentries(const struct dirent *direntry){

1245

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

1246

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

1247

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

1248

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

1249

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

1250

return 0;

1251

}

1252

return 1;

1253

}

1254

1255

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

1256

int runnable_hook(const struct dirent *direntry){

1257

int ret;

1258

size_t sret;

1259

struct stat st;

1260

1261

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

1262

/* Empty name? */

1263

return 0;

1264

}

1265

1266

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

1267

"abcdefghijklmnopqrstuvwxyz"

1268

"0123456789"

1269

"_-");

1270

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

1271

/* Contains non-allowed characters */

1272

if(debug){

1273

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

1274

direntry->d_name);

1275

}

1276

return 0;

1277

}

1278

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1287

if(ret == -1){

1288

if(debug){

1289

perror_plus("Could not stat hook");

1290

}

1291

return 0;

1292

}

1293

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

1294

/* Not a regular file */

1295

if(debug){

1296

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

1297

direntry->d_name);

1298

}

1299

return 0;

1300

}

1301

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

1302

/* Not executable */

1303

if(debug){

1304

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

1305

direntry->d_name);

1306

}

1307

return 0;

1308

}

1309

if(debug){

1310

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

1311

direntry->d_name);

1312

}

1313

return 1;

1314

}

1315

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1317

int ret;

1318

struct timespec now;

1319

struct timespec waited_time;

1320

intmax_t block_time;

1321

1322

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1325

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

1326

" No timeout!\n");

1327

}

1328

ret = avahi_simple_poll_iterate(s, -1);

1329

} else {

1330

if (debug){

1331

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

1332

" it, or wait\n");

1333

}

1334

/* the current time */

1335

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1336

if(ret == -1){

1337

perror_plus("clock_gettime");

1338

return -1;

1339

}

1340

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

1341

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

1342

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1344

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1346

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

1347

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

1348

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

1349

block_time = ((retry_interval

1350

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

1351

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

1352

1353

if (debug){

1354

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

1355

block_time);

1356

}

1357

1358

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

1363

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1365

return 0;

1366

}

1367

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1369

if(ret == -1){

1370

perror_plus("clock_gettime");

1371

return -1;

1372

}

1373

mc.current_server = mc.current_server->next;

1374

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

1375

servers, but don't block */

1376

}

1377

1378

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

1379

}

1380

if(ret != 0){

1381

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

1382

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

1383

}

1384

}

1385

}

1386

}

1387

1388

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

1389

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1395

if(numhooks == -1){

1396

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1404

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1473

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1120

1515

}

1121

1516

1122

1517

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

1141

1536

bool gnutls_initialized = false;

1142

1537

bool gpgme_initialized = false;

1143

1538

float delay = 2.5f;

1539

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

1540

retrying the same server again */

1144

1541

1145

1542

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1543

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1549

errno = 0;

1153

1550

ret = setgid(gid);

1154

1551

if(ret == -1){

1155

perror("setgid");

1552

perror_plus("setgid");

1156

1553

}

1157

1554

1158

1555

/* Lower user privileges (temporarily) */

1159

1556

errno = 0;

1160

1557

ret = seteuid(uid);

1161

1558

if(ret == -1){

1162

perror("seteuid");

1559

perror_plus("seteuid");

1163

1560

}

1164

1561

1165

1562

if(quit_now){

1200

1597

.arg = "SECONDS",

1201

1598

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

1202

1599

.group = 2 },

1600

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

1601

.arg = "SECONDS",

1602

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

1603

.group = 2 },

1604

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

1605

.arg = "DIR",

1606

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

1607

.group = 2 },

1203

1608

/*

1204

1609

* These reproduce what we would get without ARGP_NO_HELP

1205

1610

*/

1249

1654

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

1250

1655

argp_error(state, "Bad delay");

1251

1656

}

1657

case 132: /* --retry */

1658

errno = 0;

1659

retry_interval = strtod(arg, &tmp);

1660

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

1661

or (retry_interval * 1000) > INT_MAX

1662

or retry_interval < 0){

1663

argp_error(state, "Bad retry interval");

1664

}

1665

break;

1666

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

1667

hookdir = arg;

1252

1668

break;

1253

1669

/*

1254

1670

* These reproduce what we would get without ARGP_NO_HELP

1261

1677

argp_state_help(state, state->out_stream,

1262

1678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1679

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

1264

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

1680

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

1265

1681

exit(argp_err_exit_status);

1266

1682

break;

1267

1683

default:

1282

1698

case ENOMEM:

1283

1699

default:

1284

1700

errno = ret;

1285

perror("argp_parse");

1701

perror_plus("argp_parse");

1286

1702

exitcode = EX_OSERR;

1287

1703

goto end;

1288

1704

case EINVAL:

1290

1706

goto end;

1291

1707

}

1292

1708

}

1709

1710

{

1711

/* Work around Debian bug #633582:

1712

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

1713

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

1719

} else {

1720

struct stat st;

1721

1722

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

1723

int seckey_fd = open(seckey, O_RDONLY);

1724

if(seckey_fd == -1){

1725

perror_plus("open");

1726

} else {

1727

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

1728

if(ret == -1){

1729

perror_plus("fstat");

1730

} else {

1731

if(S_ISREG(st.st_mode)

1732

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

1733

ret = fchown(seckey_fd, uid, gid);

1734

if(ret == -1){

1735

perror_plus("fchown");

1736

}

1737

}

1738

}

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

1740

}

1741

}

1742

1743

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

1744

int pubkey_fd = open(pubkey, O_RDONLY);

1745

if(pubkey_fd == -1){

1746

perror_plus("open");

1747

} else {

1748

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

1749

if(ret == -1){

1750

perror_plus("fstat");

1751

} else {

1752

if(S_ISREG(st.st_mode)

1753

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

1754

ret = fchown(pubkey_fd, uid, gid);

1755

if(ret == -1){

1756

perror_plus("fchown");

1757

}

1758

}

1759

}

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

1764

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

1769

}

1770

}

1771

}

1772

1773

/* Run network hooks */

1774

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

1775

goto end;

1776

}

1293

1777

1294

1778

if(not debug){

1295

1779

avahi_set_log_function(empty_log);

1296

1780

}

1297

1781

1298

1782

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

1299

1783

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1302

1793

if(ret >= 1){

1303

/* Pick the first good interface */

1794

/* Pick the first interface returned */

1304

1795

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

1305

1796

if(debug){

1306

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

1797

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

1307

1798

}

1308

1799

if(interface == NULL){

1309

perror("malloc");

1800

perror_plus("malloc");

1310

1801

free(direntries);

1311

1802

exitcode = EXIT_FAILURE;

1312

1803

goto end;

1314

1805

free(direntries);

1315

1806

} else {

1316

1807

free(direntries);

1317

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

1808

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

1318

1809

exitcode = EXIT_FAILURE;

1319

1810

goto end;

1320

1811

}

1326

1817

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

1327

1818

mc.simple_poll = avahi_simple_poll_new();

1328

1819

if(mc.simple_poll == NULL){

1329

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

1820

fprintf_plus(stderr,

1821

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

1330

1822

exitcode = EX_UNAVAILABLE;

1331

1823

goto end;

1332

1824

}

1334

1826

sigemptyset(&sigterm_action.sa_mask);

1335

1827

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

1336

1828

if(ret == -1){

1337

perror("sigaddset");

1829

perror_plus("sigaddset");

1338

1830

exitcode = EX_OSERR;

1339

1831

goto end;

1340

1832

}

1341

1833

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

1342

1834

if(ret == -1){

1343

perror("sigaddset");

1835

perror_plus("sigaddset");

1344

1836

exitcode = EX_OSERR;

1345

1837

goto end;

1346

1838

}

1347

1839

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

1348

1840

if(ret == -1){

1349

perror("sigaddset");

1841

perror_plus("sigaddset");

1350

1842

exitcode = EX_OSERR;

1351

1843

goto end;

1352

1844

}

1356

1848

*/

1357

1849

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

1358

1850

if(ret == -1){

1359

perror("sigaction");

1851

perror_plus("sigaction");

1360

1852

return EX_OSERR;

1361

1853

}

1362

1854

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1855

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

1364

1856

if(ret == -1){

1365

perror("sigaction");

1857

perror_plus("sigaction");

1366

1858

exitcode = EX_OSERR;

1367

1859

goto end;

1368

1860

}

1369

1861

}

1370

1862

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

1371

1863

if(ret == -1){

1372

perror("sigaction");

1864

perror_plus("sigaction");

1373

1865

return EX_OSERR;

1374

1866

}

1375

1867

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1868

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

1377

1869

if(ret == -1){

1378

perror("sigaction");

1870

perror_plus("sigaction");

1379

1871

exitcode = EX_OSERR;

1380

1872

goto end;

1381

1873

}

1382

1874

}

1383

1875

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

1384

1876

if(ret == -1){

1385

perror("sigaction");

1877

perror_plus("sigaction");

1386

1878

return EX_OSERR;

1387

1879

}

1388

1880

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1881

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

1390

1882

if(ret == -1){

1391

perror("sigaction");

1883

perror_plus("sigaction");

1392

1884

exitcode = EX_OSERR;

1393

1885

goto end;

1394

1886

}

1398

1890

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

1399

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1892

if(if_index == 0){

1401

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

1893

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

1402

1894

exitcode = EX_UNAVAILABLE;

1403

1895

goto end;

1404

1896

}

1411

1903

errno = 0;

1412

1904

ret = seteuid(0);

1413

1905

if(ret == -1){

1414

perror("seteuid");

1906

perror_plus("seteuid");

1415

1907

}

1416

1908

1417

1909

#ifdef __linux__

1421

1913

bool restore_loglevel = true;

1422

1914

if(ret == -1){

1423

1915

restore_loglevel = false;

1424

perror("klogctl");

1916

perror_plus("klogctl");

1425

1917

}

1426

1918

#endif /* __linux__ */

1427

1919

1428

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1921

if(sd < 0){

1430

perror("socket");

1922

perror_plus("socket");

1431

1923

exitcode = EX_OSERR;

1432

1924

#ifdef __linux__

1433

1925

if(restore_loglevel){

1434

1926

ret = klogctl(7, NULL, 0);

1435

1927

if(ret == -1){

1436

perror("klogctl");

1928

perror_plus("klogctl");

1437

1929

}

1438

1930

}

1439

1931

#endif /* __linux__ */

1441

1933

errno = 0;

1442

1934

ret = seteuid(uid);

1443

1935

if(ret == -1){

1444

perror("seteuid");

1936

perror_plus("seteuid");

1445

1937

}

1446

1938

goto end;

1447

1939

}

1448

1940

strcpy(network.ifr_name, interface);

1449

1941

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

1450

1942

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1943

perror_plus("ioctl SIOCGIFFLAGS");

1452

1944

#ifdef __linux__

1453

1945

if(restore_loglevel){

1454

1946

ret = klogctl(7, NULL, 0);

1455

1947

if(ret == -1){

1456

perror("klogctl");

1948

perror_plus("klogctl");

1457

1949

}

1458

1950

}

1459

1951

#endif /* __linux__ */

1462

1954

errno = 0;

1463

1955

ret = seteuid(uid);

1464

1956

if(ret == -1){

1465

perror("seteuid");

1957

perror_plus("seteuid");

1466

1958

}

1467

1959

goto end;

1468

1960

}

1472

1964

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

1473

1965

if(ret == -1){

1474

1966

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1968

exitcode = EX_OSERR;

1477

1969

#ifdef __linux__

1478

1970

if(restore_loglevel){

1479

1971

ret = klogctl(7, NULL, 0);

1480

1972

if(ret == -1){

1481

perror("klogctl");

1973

perror_plus("klogctl");

1482

1974

}

1483

1975

}

1484

1976

#endif /* __linux__ */

1486

1978

errno = 0;

1487

1979

ret = seteuid(uid);

1488

1980

if(ret == -1){

1489

perror("seteuid");

1981

perror_plus("seteuid");

1490

1982

}

1491

1983

goto end;

1492

1984

}

1493

1985

}

1494

/* sleep checking until interface is running */

1986

/* Sleep checking until interface is running.

1987

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

1495

1988

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

1496

1989

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

1497

1990

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1991

perror_plus("ioctl SIOCGIFFLAGS");

1499

1992

} else if(network.ifr_flags & IFF_RUNNING){

1500

1993

break;

1501

1994

}

1502

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1996

ret = nanosleep(&sleeptime, NULL);

1504

1997

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

1505

perror("nanosleep");

1998

perror_plus("nanosleep");

1506

1999

}

1507

2000

}

1508

2001

if(not take_down_interface){

1509

2002

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

1510

2003

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

1511

2004

if(ret == -1){

1512

perror("close");

2005

perror_plus("close");

1513

2006

}

1514

2007

}

1515

2008

#ifdef __linux__

1517

2010

/* Restores kernel loglevel to default */

1518

2011

ret = klogctl(7, NULL, 0);

1519

2012

if(ret == -1){

1520

perror("klogctl");

2013

perror_plus("klogctl");

1521

2014

}

1522

2015

}

1523

2016

#endif /* __linux__ */

1524

2017

/* Lower privileges */

1525

2018

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

1538

2023

}

1539

2024

}

1540

2025

1544

2029

1545

2030

ret = init_gnutls_global(pubkey, seckey);

1546

2031

if(ret == -1){

1547

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

2032

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

1548

2033

exitcode = EX_UNAVAILABLE;

1549

2034

goto end;

1550

2035

} else {

1555

2040

goto end;

1556

2041

}

1557

2042

2043

if(mkdtemp(tempdir) == NULL){

2044

perror_plus("mkdtemp");

2045

goto end;

2046

}

1558

2047

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2048

1565

2049

if(quit_now){

1566

2050

goto end;

1567

2051

}

1568

2052

1569

2053

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

1570

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

2054

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

1571

2055

exitcode = EX_UNAVAILABLE;

1572

2056

goto end;

1573

2057

} else {

1583

2067

/* (Mainly meant for debugging) */

1584

2068

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

1585

2069

if(address == NULL){

1586

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

2070

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

1587

2071

exitcode = EX_USAGE;

1588

2072

goto end;

1589

2073

}

1597

2081

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

1598

2082

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

1599

2083

or tmpmax != (uint16_t)tmpmax){

1600

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

2084

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

1601

2085

exitcode = EX_USAGE;

1602

2086

goto end;

1603

2087

}

1608

2092

1609

2093

port = (uint16_t)tmpmax;

1610

2094

*address = '\0';

1611

address = connect_to;

1612

2095

/* Colon in address indicates IPv6 */

1613

2096

int af;

1614

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

2097

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

1615

2098

af = AF_INET6;

2099

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

2100

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

2101

{

2102

connect_to++;

2103

address[-1] = '\0';

2104

}

1616

2105

} else {

1617

2106

af = AF_INET;

1618

2107

}

2108

address = connect_to;

1619

2109

1620

2110

if(quit_now){

1621

2111

goto end;

1622

2112

}

1623

2113

1624

2114

while(not quit_now){

1625

2115

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

1626

2116

if(quit_now or ret == 0){

1627

2117

break;

1628

2118

}

1629

sleep(15);

1630

};

1631

2119

if(debug){

2120

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

2121

(int)retry_interval);

2122

}

2123

sleep((int)retry_interval);

2124

}

2125

1632

2126

if (not quit_now){

1633

2127

exitcode = EXIT_SUCCESS;

1634

2128

}

1635

2129

1636

2130

goto end;

1637

2131

}

1638

2132

1660

2154

1661

2155

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

1662

2156

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2157

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

2158

avahi_strerror(error));

1665

2159

exitcode = EX_UNAVAILABLE;

1666

2160

goto end;

1667

2161

}

1675

2169

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2170

NULL, 0, browse_callback, NULL);

1677

2171

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

1680

2174

exitcode = EX_UNAVAILABLE;

1681

2175

goto end;

1682

2176

}

1688

2182

/* Run the main loop */

1689

2183

1690

2184

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2185

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

2186

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2190

if(debug){

2191

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

2192

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

2193

}

1695

2194

1696

2195

end:

1697

2196

1698

2197

if(debug){

1699

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

2198

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

1700

2199

}

1701

2200

1702

2201

/* Cleanup things */

1719

2218

gpgme_release(mc.ctx);

1720

2219

}

1721

2220

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

2221

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

2222

has seen */

2223

if(mc.current_server != NULL){

2224

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

2225

while(mc.current_server != NULL){

2226

server *next = mc.current_server->next;

2227

free(mc.current_server);

2228

mc.current_server = next;

2229

}

2230

}

2231

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2236

{

1725

2237

errno = 0;

1726

2238

ret = seteuid(0);

1727

2239

if(ret == -1){

1728

perror("seteuid");

2240

perror_plus("seteuid");

1729

2241

}

1730

if(geteuid() == 0){

2242

2243

/* Take down the network interface */

2244

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

1731

2245

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

1732

2246

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

1735

2249

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

1736

2250

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

1737

2251

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2253

}

1740

2254

}

1741

2255

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

1742

2256

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2257

perror_plus("close");

1750

2258

}

1751

2259

}

1752

2260

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

1753

2267

1754

/* Removes the temp directory used by GPGME */

2268

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

1755

2269

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2270

struct dirent **direntries = NULL;

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

2276

direntry = direntries[i];

1776

2277

char *fullname = NULL;

1777

2278

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

1778

2279

direntry->d_name);

1779

2280

if(ret < 0){

1780

perror("asprintf");

2281

perror_plus("asprintf");

1781

2282

continue;

1782

2283

}

1783

2284

ret = remove(fullname);

1784

2285

if(ret == -1){

1785

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

1786

strerror(errno));

2286

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

2287

strerror(errno));

1787

2288

}

1788

2289

free(fullname);

1789

2290

}

1790

closedir(d);

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

1791

2297

}

1792

2298

ret = rmdir(tempdir);

1793

2299

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

1794

perror("rmdir");

2300

perror_plus("rmdir");

1795

2301

}

1796

2302

}

1797

2303

1802

2308

&old_sigterm_action,

1803

2309

NULL));

1804

2310

if(ret == -1){

1805

perror("sigaction");

2311

perror_plus("sigaction");

1806

2312

}

1807

2313

do {

1808

2314

ret = raise(signal_received);

1809

2315

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

1810

2316

if(ret != 0){

1811

perror("raise");

2317

perror_plus("raise");

1812

2318

abort();

1813

2319

}

1814

2320

TEMP_FAILURE_RETRY(pause());