/mandos/release : revision 237.7.79

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

10

*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

56

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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setgid(), pause() */

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

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

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

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

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

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argp_state, struct argp,

84

85

raise() */

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86

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

86

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

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WEXITSTATUS(), WTERMSIG() */

90

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

87

91

88

92

#ifdef __linux__

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(),

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GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

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/* GPGME */

114

118

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

122

126

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

123

127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

129

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

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130

126

131

bool debug = false;

127

132

static const char mandos_protocol_version[] = "1";

128

133

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

129

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

134

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

130

135

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

131

136

char *connect_to = NULL;

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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;

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AvahiIfIndex if_index;

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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",

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.current_server = NULL };

148

167

149

168

sig_atomic_t quit_now = 0;

150

169

int signal_received = 0;

151

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

152

187

/*

153

188

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

154

189

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

155

190

* "buffer_length" is how much is already used.

156

191

*/

157

192

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

193

size_t buffer_capacity){

159

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

195

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

161

196

if(buffer == NULL){

166

201

return buffer_capacity;

167

202

}

168

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return false;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return false;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return false;

237

}

238

return true;

239

}

240

169

241

/*

170

242

* Initialize GPGME.

171

243

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

174

246

gpgme_error_t rc;

175

247

gpgme_engine_info_t engine_info;

176

248

185

257

186

258

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

187

259

if(fd == -1){

188

perror("open");

260

perror_plus("open");

189

261

return false;

190

262

}

191

263

192

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

265

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

266

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

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gpgme_strsource(rc), gpgme_strerror(rc));

196

268

return false;

197

269

}

198

270

199

271

rc = gpgme_op_import(mc.ctx, pgp_data);

200

272

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

203

275

return false;

204

276

}

205

277

206

278

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

207

279

if(ret == -1){

208

perror("close");

280

perror_plus("close");

209

281

}

210

282

gpgme_data_release(pgp_data);

211

283

return true;

212

284

}

213

285

214

286

if(debug){

215

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

287

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

216

288

}

217

289

218

290

/* Init GPGME */

219

291

gpgme_check_version(NULL);

220

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

293

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

224

296

return false;

225

297

}

226

298

227

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

299

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

228

300

rc = gpgme_get_engine_info(&engine_info);

229

301

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

232

304

return false;

233

305

}

234

306

while(engine_info != NULL){

240

312

engine_info = engine_info->next;

241

313

}

242

314

if(engine_info == NULL){

243

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

315

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

316

tempdir);

244

317

return false;

245

318

}

246

319

247

320

/* Create new GPGME "context" */

248

321

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

249

322

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

252

326

return false;

253

327

}

254

328

273

347

ssize_t plaintext_length = 0;

274

348

275

349

if(debug){

276

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

350

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

277

351

}

278

352

279

353

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

280

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

355

0);

282

356

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

285

359

return -1;

286

360

}

287

361

288

362

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

289

363

rc = gpgme_data_new(&dh_plain);

290

364

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

293

368

gpgme_data_release(dh_crypto);

294

369

return -1;

295

370

}

298

373

data buffer */

299

374

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

300

375

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

303

378

plaintext_length = -1;

304

379

if(debug){

305

380

gpgme_decrypt_result_t result;

306

381

result = gpgme_op_decrypt_result(mc.ctx);

307

382

if(result == NULL){

308

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

383

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

309

384

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

314

389

if(result->file_name != NULL){

315

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

390

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

316

391

}

317

392

gpgme_recipient_t recipient;

318

393

recipient = result->recipients;

319

394

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

326

402

recipient = recipient->next;

327

403

}

328

404

}

331

407

}

332

408

333

409

if(debug){

334

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

410

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

335

411

}

336

412

337

413

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

338

414

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

339

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

340

416

plaintext_length = -1;

341

417

goto decrypt_end;

342

418

}

344

420

*plaintext = NULL;

345

421

while(true){

346

422

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

349

425

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

353

429

}

354

430

355

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

436

break;

361

437

}

362

438

if(ret < 0){

363

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

364

440

plaintext_length = -1;

365

441

goto decrypt_end;

366

442

}

368

444

}

369

445

370

446

if(debug){

371

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

447

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

372

448

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

373

449

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

374

450

}

396

472

/* GnuTLS log function callback */

397

473

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

398

474

const char* string){

399

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

475

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

400

476

}

401

477

402

478

static int init_gnutls_global(const char *pubkeyfilename,

404

480

int ret;

405

481

406

482

if(debug){

407

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

483

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

408

484

}

409

485

410

486

ret = gnutls_global_init();

411

487

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

414

490

return -1;

415

491

}

416

492

423

499

}

424

500

425

501

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

503

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

433

506

gnutls_global_deinit();

434

507

return -1;

435

508

}

436

509

437

510

if(debug){

438

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

439

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

440

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

441

515

}

442

516

443

517

ret = gnutls_certificate_set_openpgp_key_file

444

518

(mc.cred, pubkeyfilename, seckeyfilename,

445

519

GNUTLS_OPENPGP_FMT_BASE64);

446

520

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

452

526

goto globalfail;

453

527

}

454

528

455

529

/* GnuTLS server initialization */

456

530

ret = gnutls_dh_params_init(&mc.dh_params);

457

531

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

460

535

goto globalfail;

461

536

}

462

537

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

463

538

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

466

541

goto globalfail;

467

542

}

468

543

488

563

}

489

564

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

490

565

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

493

569

}

494

570

495

571

{

502

578

}

503

579

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

504

580

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

508

584

gnutls_deinit(*session);

509

585

return -1;

510

586

}

519

595

}

520

596

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

521

597

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

524

600

gnutls_deinit(*session);

525

601

return -1;

526

602

}

571

647

pf = PF_INET;

572

648

break;

573

649

default:

574

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

650

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

575

651

errno = EINVAL;

576

652

return -1;

577

653

}

582

658

}

583

659

584

660

if(debug){

585

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

586

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

587

663

}

588

664

589

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

666

if(tcp_sd < 0){

591

667

int e = errno;

592

perror("socket");

668

perror_plus("socket");

593

669

errno = e;

594

670

goto mandos_end;

595

671

}

609

685

}

610

686

if(ret < 0 ){

611

687

int e = errno;

612

perror("inet_pton");

688

perror_plus("inet_pton");

613

689

errno = e;

614

690

goto mandos_end;

615

691

}

616

692

if(ret == 0){

617

693

int e = errno;

618

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

694

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

619

695

errno = e;

620

696

goto mandos_end;

621

697

}

626

702

627

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

704

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

629

-Wunreachable-code*/

705

-Wunreachable-code*/

630

706

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

633

709

errno = EINVAL;

634

710

goto mandos_end;

635

711

}

651

727

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

652

728

char interface[IF_NAMESIZE];

653

729

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

654

perror("if_indextoname");

730

perror_plus("if_indextoname");

655

731

} else {

656

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

657

ip, interface, port);

732

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

733

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

658

734

}

659

735

} else {

660

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

661

port);

736

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

737

ip, port);

662

738

}

663

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

747

sizeof(addrstr));

672

748

}

673

749

if(pcret == NULL){

674

perror("inet_ntop");

750

perror_plus("inet_ntop");

675

751

} else {

676

752

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

677

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

753

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

678

754

}

679

755

}

680

756

}

692

768

if(ret < 0){

693

769

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

694

770

int e = errno;

695

perror("connect");

771

perror_plus("connect");

696

772

errno = e;

697

773

}

698

774

goto mandos_end;

708

784

while(true){

709

785

size_t out_size = strlen(out);

710

786

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

711

out_size - written));

787

out_size - written));

712

788

if(ret == -1){

713

789

int e = errno;

714

perror("write");

790

perror_plus("write");

715

791

errno = e;

716

792

goto mandos_end;

717

793

}

734

810

}

735

811

736

812

if(debug){

737

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

813

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

738

814

}

739

815

740

816

if(quit_now){

742

818

goto mandos_end;

743

819

}

744

820

821

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

745

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

823

747

824

if(quit_now){

759

836

760

837

if(ret != GNUTLS_E_SUCCESS){

761

838

if(debug){

762

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

839

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

763

840

gnutls_perror(ret);

764

841

}

765

842

errno = EPROTO;

769

846

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

770

847

771

848

if(debug){

772

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

773

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

774

851

}

775

852

776

853

while(true){

781

858

}

782

859

783

860

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

861

buffer_capacity);

785

862

if(buffer_capacity == 0){

786

863

int e = errno;

787

perror("incbuffer");

864

perror_plus("incbuffer");

788

865

errno = e;

789

866

goto mandos_end;

790

867

}

814

891

}

815

892

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

816

893

if(ret < 0){

817

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

894

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

895

"***\n");

818

896

gnutls_perror(ret);

819

897

errno = EPROTO;

820

898

goto mandos_end;

821

899

}

822

900

break;

823

901

default:

824

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

825

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

826

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

905

errno = EIO;

828

906

goto mandos_end;

833

911

}

834

912

835

913

if(debug){

836

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

914

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

837

915

}

838

916

839

917

if(quit_now){

851

929

852

930

if(buffer_length > 0){

853

931

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

933

&decrypted_buffer);

857

934

if(decrypted_buffer_size >= 0){

858

935

869

946

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

870

947

int e = errno;

871

948

if(debug){

872

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

873

strerror(errno));

949

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

950

strerror(errno));

874

951

}

875

952

errno = e;

876

953

goto mandos_end;

895

972

if(e == 0){

896

973

e = errno;

897

974

}

898

perror("close");

975

perror_plus("close");

899

976

}

900

977

gnutls_deinit(session);

978

errno = e;

901

979

if(quit_now){

902

e = EINTR;

980

errno = EINTR;

903

981

retval = -1;

904

982

}

905

errno = e;

906

983

}

907

984

return retval;

908

985

}

933

1010

switch(event){

934

1011

default:

935

1012

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

939

1017

break;

940

1018

941

1019

case AVAHI_RESOLVER_FOUND:

943

1021

char ip[AVAHI_ADDRESS_STR_MAX];

944

1022

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

945

1023

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1024

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

1025

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

1026

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

949

1027

}

950

1028

int ret = start_mandos_communication(ip, port, interface,

951

1029

avahi_proto_to_af(proto));

952

1030

if(ret == 0){

953

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

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

1036

" list\n", name);

1037

}

954

1038

}

955

1039

}

956

1040

}

980

1064

default:

981

1065

case AVAHI_BROWSER_FAILURE:

982

1066

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1067

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

985

1069

avahi_simple_poll_quit(mc.simple_poll);

986

1070

return;

987

1071

994

1078

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

995

1079

name, type, domain, protocol, 0,

996

1080

resolve_callback, NULL) == NULL)

997

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

998

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

1081

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

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

999

1084

break;

1000

1085

1001

1086

case AVAHI_BROWSER_REMOVE:

1004

1089

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1090

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1091

if(debug){

1007

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

1092

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

1093

" searching...\n");

1008

1094

}

1009

1095

break;

1010

1096

}

1011

1097

}

1012

1098

1013

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

1099

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

1014

1100

static void handle_sigterm(int sig){

1015

1101

if(quit_now){

1016

1102

return;

1018

1104

quit_now = 1;

1019

1105

signal_received = sig;

1020

1106

int old_errno = errno;

1107

/* set main loop to exit */

1021

1108

if(mc.simple_poll != NULL){

1022

1109

avahi_simple_poll_quit(mc.simple_poll);

1023

1110

}

1024

1111

errno = old_errno;

1025

1112

}

1026

1113

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){

1114

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

1115

int ret;

1116

1117

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

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1081

1125

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1126

perror_plus("ioctl SIOCGIFFLAGS");

1084

1127

}

1085

free(flagstring);

1086

return 0;

1128

return false;

1087

1129

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1130

return true;

1131

}

1132

1133

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

1134

1090

1135

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1137

if(debug){

1093

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

1094

if_entry->d_name);

1138

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

1139

ifname);

1095

1140

}

1096

return 0;

1141

return false;

1097

1142

}

1098

1143

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

1099

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

1144

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

1100

1145

if(debug){

1101

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

1102

if_entry->d_name);

1146

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

1147

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

1103

1148

}

1104

return 1;

1149

return true;

1105

1150

}

1106

1151

/* 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

}

1152

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

1153

if(debug){

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

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

1156

}

1157

return false;

1158

}

1159

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

1160

if(ifr->ifr_flags & IFF_NOARP){

1161

if(debug){

1162

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

1163

ifname);

1164

}

1165

return false;

1166

}

1167

1114

1168

/* Accept this device */

1115

1169

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1170

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

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

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

1177

* corresponds to an acceptable network device.

1178

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

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

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

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

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

1187

if(debug){

1188

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

1189

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

1190

}

1191

return 0;

1192

}

1193

1194

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

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1243

int notdotentries(const struct dirent *direntry){

1244

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

1245

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

1246

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

1247

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

1248

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

1249

return 0;

1250

}

1251

return 1;

1252

}

1253

1254

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

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

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

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

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

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

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

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

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

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

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

1293

/* Not a regular file */

1294

if(debug){

1295

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

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not executable */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1316

int ret;

1317

struct timespec now;

1318

struct timespec waited_time;

1319

intmax_t block_time;

1320

1321

while(true){

1322

if(mc.current_server == NULL){

1323

if (debug){

1324

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

1325

" No timeout!\n");

1326

}

1327

ret = avahi_simple_poll_iterate(s, -1);

1328

} else {

1329

if (debug){

1330

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

1331

" it, or wait\n");

1332

}

1333

/* the current time */

1334

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1335

if(ret == -1){

1336

perror_plus("clock_gettime");

1337

return -1;

1338

}

1339

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

1340

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

1341

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1343

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1345

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

1346

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

1347

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

1348

block_time = ((retry_interval

1349

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

1350

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

1351

1352

if (debug){

1353

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

1354

block_time);

1355

}

1356

1357

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1362

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1364

return 0;

1365

}

1366

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1368

if(ret == -1){

1369

perror_plus("clock_gettime");

1370

return -1;

1371

}

1372

mc.current_server = mc.current_server->next;

1373

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

1374

servers, but don't block */

1375

}

1376

1377

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

1378

}

1379

if(ret != 0){

1380

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

1381

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

1382

}

1383

}

1384

}

1385

}

1386

1387

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

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1120

1512

}

1121

1513

1122

1514

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

1141

1533

bool gnutls_initialized = false;

1142

1534

bool gpgme_initialized = false;

1143

1535

float delay = 2.5f;

1536

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

1537

retrying the same server again */

1144

1538

1145

1539

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1540

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1546

errno = 0;

1153

1547

ret = setgid(gid);

1154

1548

if(ret == -1){

1155

perror("setgid");

1549

perror_plus("setgid");

1156

1550

}

1157

1551

1158

1552

/* Lower user privileges (temporarily) */

1159

1553

errno = 0;

1160

1554

ret = seteuid(uid);

1161

1555

if(ret == -1){

1162

perror("seteuid");

1556

perror_plus("seteuid");

1163

1557

}

1164

1558

1165

1559

if(quit_now){

1200

1594

.arg = "SECONDS",

1201

1595

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

1202

1596

.group = 2 },

1597

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

1598

.arg = "SECONDS",

1599

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

1600

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

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

1604

.group = 2 },

1203

1605

/*

1204

1606

* These reproduce what we would get without ARGP_NO_HELP

1205

1607

*/

1249

1651

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

1250

1652

argp_error(state, "Bad delay");

1251

1653

}

1654

case 132: /* --retry */

1655

errno = 0;

1656

retry_interval = strtod(arg, &tmp);

1657

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

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1660

argp_error(state, "Bad retry interval");

1661

}

1662

break;

1663

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

1664

hookdir = arg;

1252

1665

break;

1253

1666

/*

1254

1667

* These reproduce what we would get without ARGP_NO_HELP

1261

1674

argp_state_help(state, state->out_stream,

1262

1675

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1676

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

1264

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

1677

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

1265

1678

exit(argp_err_exit_status);

1266

1679

break;

1267

1680

default:

1282

1695

case ENOMEM:

1283

1696

default:

1284

1697

errno = ret;

1285

perror("argp_parse");

1698

perror_plus("argp_parse");

1286

1699

exitcode = EX_OSERR;

1287

1700

goto end;

1288

1701

case EINVAL:

1290

1703

goto end;

1291

1704

}

1292

1705

}

1706

1707

{

1708

/* Work around Debian bug #633582:

1709

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

1710

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

1716

} else {

1717

struct stat st;

1718

1719

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

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

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

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode)

1750

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

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

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

1772

goto end;

1773

}

1293

1774

1294

1775

if(not debug){

1295

1776

avahi_set_log_function(empty_log);

1296

1777

}

1297

1778

1298

1779

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

1299

1780

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1302

1790

if(ret >= 1){

1303

/* Pick the first good interface */

1791

/* Pick the first interface returned */

1304

1792

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

1305

1793

if(debug){

1306

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

1794

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

1307

1795

}

1308

1796

if(interface == NULL){

1309

perror("malloc");

1797

perror_plus("malloc");

1310

1798

free(direntries);

1311

1799

exitcode = EXIT_FAILURE;

1312

1800

goto end;

1314

1802

free(direntries);

1315

1803

} else {

1316

1804

free(direntries);

1317

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

1805

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

1318

1806

exitcode = EXIT_FAILURE;

1319

1807

goto end;

1320

1808

}

1326

1814

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

1327

1815

mc.simple_poll = avahi_simple_poll_new();

1328

1816

if(mc.simple_poll == NULL){

1329

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

1817

fprintf_plus(stderr,

1818

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

1330

1819

exitcode = EX_UNAVAILABLE;

1331

1820

goto end;

1332

1821

}

1334

1823

sigemptyset(&sigterm_action.sa_mask);

1335

1824

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

1336

1825

if(ret == -1){

1337

perror("sigaddset");

1826

perror_plus("sigaddset");

1338

1827

exitcode = EX_OSERR;

1339

1828

goto end;

1340

1829

}

1341

1830

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

1342

1831

if(ret == -1){

1343

perror("sigaddset");

1832

perror_plus("sigaddset");

1344

1833

exitcode = EX_OSERR;

1345

1834

goto end;

1346

1835

}

1347

1836

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

1348

1837

if(ret == -1){

1349

perror("sigaddset");

1838

perror_plus("sigaddset");

1350

1839

exitcode = EX_OSERR;

1351

1840

goto end;

1352

1841

}

1356

1845

*/

1357

1846

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

1358

1847

if(ret == -1){

1359

perror("sigaction");

1848

perror_plus("sigaction");

1360

1849

return EX_OSERR;

1361

1850

}

1362

1851

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1852

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

1364

1853

if(ret == -1){

1365

perror("sigaction");

1854

perror_plus("sigaction");

1366

1855

exitcode = EX_OSERR;

1367

1856

goto end;

1368

1857

}

1369

1858

}

1370

1859

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

1371

1860

if(ret == -1){

1372

perror("sigaction");

1861

perror_plus("sigaction");

1373

1862

return EX_OSERR;

1374

1863

}

1375

1864

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1865

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

1377

1866

if(ret == -1){

1378

perror("sigaction");

1867

perror_plus("sigaction");

1379

1868

exitcode = EX_OSERR;

1380

1869

goto end;

1381

1870

}

1382

1871

}

1383

1872

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

1384

1873

if(ret == -1){

1385

perror("sigaction");

1874

perror_plus("sigaction");

1386

1875

return EX_OSERR;

1387

1876

}

1388

1877

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1878

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

1390

1879

if(ret == -1){

1391

perror("sigaction");

1880

perror_plus("sigaction");

1392

1881

exitcode = EX_OSERR;

1393

1882

goto end;

1394

1883

}

1398

1887

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

1399

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1889

if(if_index == 0){

1401

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

1890

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

1402

1891

exitcode = EX_UNAVAILABLE;

1403

1892

goto end;

1404

1893

}

1411

1900

errno = 0;

1412

1901

ret = seteuid(0);

1413

1902

if(ret == -1){

1414

perror("seteuid");

1903

perror_plus("seteuid");

1415

1904

}

1416

1905

1417

1906

#ifdef __linux__

1421

1910

bool restore_loglevel = true;

1422

1911

if(ret == -1){

1423

1912

restore_loglevel = false;

1424

perror("klogctl");

1913

perror_plus("klogctl");

1425

1914

}

1426

1915

#endif /* __linux__ */

1427

1916

1428

1917

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1918

if(sd < 0){

1430

perror("socket");

1919

perror_plus("socket");

1431

1920

exitcode = EX_OSERR;

1432

1921

#ifdef __linux__

1433

1922

if(restore_loglevel){

1434

1923

ret = klogctl(7, NULL, 0);

1435

1924

if(ret == -1){

1436

perror("klogctl");

1925

perror_plus("klogctl");

1437

1926

}

1438

1927

}

1439

1928

#endif /* __linux__ */

1441

1930

errno = 0;

1442

1931

ret = seteuid(uid);

1443

1932

if(ret == -1){

1444

perror("seteuid");

1933

perror_plus("seteuid");

1445

1934

}

1446

1935

goto end;

1447

1936

}

1448

1937

strcpy(network.ifr_name, interface);

1449

1938

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

1450

1939

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1940

perror_plus("ioctl SIOCGIFFLAGS");

1452

1941

#ifdef __linux__

1453

1942

if(restore_loglevel){

1454

1943

ret = klogctl(7, NULL, 0);

1455

1944

if(ret == -1){

1456

perror("klogctl");

1945

perror_plus("klogctl");

1457

1946

}

1458

1947

}

1459

1948

#endif /* __linux__ */

1462

1951

errno = 0;

1463

1952

ret = seteuid(uid);

1464

1953

if(ret == -1){

1465

perror("seteuid");

1954

perror_plus("seteuid");

1466

1955

}

1467

1956

goto end;

1468

1957

}

1472

1961

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

1473

1962

if(ret == -1){

1474

1963

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1965

exitcode = EX_OSERR;

1477

1966

#ifdef __linux__

1478

1967

if(restore_loglevel){

1479

1968

ret = klogctl(7, NULL, 0);

1480

1969

if(ret == -1){

1481

perror("klogctl");

1970

perror_plus("klogctl");

1482

1971

}

1483

1972

}

1484

1973

#endif /* __linux__ */

1486

1975

errno = 0;

1487

1976

ret = seteuid(uid);

1488

1977

if(ret == -1){

1489

perror("seteuid");

1978

perror_plus("seteuid");

1490

1979

}

1491

1980

goto end;

1492

1981

}

1493

1982

}

1494

/* sleep checking until interface is running */

1983

/* Sleep checking until interface is running.

1984

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

1495

1985

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

1496

1986

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

1497

1987

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1988

perror_plus("ioctl SIOCGIFFLAGS");

1499

1989

} else if(network.ifr_flags & IFF_RUNNING){

1500

1990

break;

1501

1991

}

1502

1992

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1993

ret = nanosleep(&sleeptime, NULL);

1504

1994

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

1505

perror("nanosleep");

1995

perror_plus("nanosleep");

1506

1996

}

1507

1997

}

1508

1998

if(not take_down_interface){

1509

1999

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

1510

2000

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

1511

2001

if(ret == -1){

1512

perror("close");

2002

perror_plus("close");

1513

2003

}

1514

2004

}

1515

2005

#ifdef __linux__

1517

2007

/* Restores kernel loglevel to default */

1518

2008

ret = klogctl(7, NULL, 0);

1519

2009

if(ret == -1){

1520

perror("klogctl");

2010

perror_plus("klogctl");

1521

2011

}

1522

2012

}

1523

2013

#endif /* __linux__ */

1524

2014

/* Lower privileges */

1525

2015

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

}

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

1538

2020

}

1539

2021

}

1540

2022

1544

2026

1545

2027

ret = init_gnutls_global(pubkey, seckey);

1546

2028

if(ret == -1){

1547

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

2029

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

1548

2030

exitcode = EX_UNAVAILABLE;

1549

2031

goto end;

1550

2032

} else {

1555

2037

goto end;

1556

2038

}

1557

2039

2040

if(mkdtemp(tempdir) == NULL){

2041

perror_plus("mkdtemp");

2042

goto end;

2043

}

1558

2044

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2045

1565

2046

if(quit_now){

1566

2047

goto end;

1567

2048

}

1568

2049

1569

2050

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

1570

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

2051

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

1571

2052

exitcode = EX_UNAVAILABLE;

1572

2053

goto end;

1573

2054

} else {

1583

2064

/* (Mainly meant for debugging) */

1584

2065

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

1585

2066

if(address == NULL){

1586

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

2067

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

1587

2068

exitcode = EX_USAGE;

1588

2069

goto end;

1589

2070

}

1597

2078

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

1598

2079

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

1599

2080

or tmpmax != (uint16_t)tmpmax){

1600

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

2081

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

1601

2082

exitcode = EX_USAGE;

1602

2083

goto end;

1603

2084

}

1608

2089

1609

2090

port = (uint16_t)tmpmax;

1610

2091

*address = '\0';

1611

address = connect_to;

1612

2092

/* Colon in address indicates IPv6 */

1613

2093

int af;

1614

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

2094

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

1615

2095

af = AF_INET6;

2096

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

2097

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

2098

{

2099

connect_to++;

2100

address[-1] = '\0';

2101

}

1616

2102

} else {

1617

2103

af = AF_INET;

1618

2104

}

2105

address = connect_to;

1619

2106

1620

2107

if(quit_now){

1621

2108

goto end;

1622

2109

}

1623

2110

1624

2111

while(not quit_now){

1625

2112

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

1626

2113

if(quit_now or ret == 0){

1627

2114

break;

1628

2115

}

1629

sleep(15);

1630

};

1631

2116

if(debug){

2117

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

2118

(int)retry_interval);

2119

}

2120

sleep((int)retry_interval);

2121

}

2122

1632

2123

if (not quit_now){

1633

2124

exitcode = EXIT_SUCCESS;

1634

2125

}

1635

2126

1636

2127

goto end;

1637

2128

}

1638

2129

1660

2151

1661

2152

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

1662

2153

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2154

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

2155

avahi_strerror(error));

1665

2156

exitcode = EX_UNAVAILABLE;

1666

2157

goto end;

1667

2158

}

1675

2166

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2167

NULL, 0, browse_callback, NULL);

1677

2168

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

1680

2171

exitcode = EX_UNAVAILABLE;

1681

2172

goto end;

1682

2173

}

1688

2179

/* Run the main loop */

1689

2180

1690

2181

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2182

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

2183

}

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2187

if(debug){

2188

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

2189

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

2190

}

1695

2191

1696

2192

end:

1697

2193

1698

2194

if(debug){

1699

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

2195

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

1700

2196

}

1701

2197

1702

2198

/* Cleanup things */

1719

2215

gpgme_release(mc.ctx);

1720

2216

}

1721

2217

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

2218

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

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

1725

2234

errno = 0;

1726

2235

ret = seteuid(0);

1727

2236

if(ret == -1){

1728

perror("seteuid");

2237

perror_plus("seteuid");

1729

2238

}

1730

if(geteuid() == 0){

2239

2240

/* Take down the network interface */

2241

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

1731

2242

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

1732

2243

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

1735

2246

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

1736

2247

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

1737

2248

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2250

}

1740

2251

}

1741

2252

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

1742

2253

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");

2254

perror_plus("close");

1750

2255

}

1751

2256

}

1752

2257

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

1753

2264

1754

/* Removes the temp directory used by GPGME */

2265

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

1755

2266

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

}

2267

struct dirent **direntries = NULL;

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

1776

2274

char *fullname = NULL;

1777

2275

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

1778

2276

direntry->d_name);

1779

2277

if(ret < 0){

1780

perror("asprintf");

2278

perror_plus("asprintf");

1781

2279

continue;

1782

2280

}

1783

2281

ret = remove(fullname);

1784

2282

if(ret == -1){

1785

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

1786

strerror(errno));

2283

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

2284

strerror(errno));

1787

2285

}

1788

2286

free(fullname);

1789

2287

}

1790

closedir(d);

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

1791

2294

}

1792

2295

ret = rmdir(tempdir);

1793

2296

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

1794

perror("rmdir");

2297

perror_plus("rmdir");

1795

2298

}

1796

2299

}

1797

2300

1802

2305

&old_sigterm_action,

1803

2306

NULL));

1804

2307

if(ret == -1){

1805

perror("sigaction");

2308

perror_plus("sigaction");

1806

2309

}

1807

2310

do {

1808

2311

ret = raise(signal_received);

1809

2312

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

1810

2313

if(ret != 0){

1811

perror("raise");

2314

perror_plus("raise");

1812

2315

abort();

1813

2316

}

1814

2317

TEMP_FAILURE_RETRY(pause());