/mandos/trunk : revision 505.3.14

9

* "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 */

57

#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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#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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#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,

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raise() */

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

86

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

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92

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

107

110

init_gnutls_session(),

108

111

GNUTLS_* */

109

112

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

112

115

113

116

/* GPGME */

114

117

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

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typedef struct server{

140

const char *ip;

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uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

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} server;

132

148

133

149

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

134

150

typedef struct {

139

155

gnutls_dh_params_t dh_params;

140

156

const char *priority;

141

157

gpgme_ctx_t ctx;

158

server *current_server;

142

159

} mandos_context;

143

160

144

161

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

145

162

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

146

163

.dh_bits = 1024, .priority = "SECURE256"

147

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

164

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

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.current_server = NULL };

148

166

149

167

sig_atomic_t quit_now = 0;

150

168

int signal_received = 0;

151

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

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program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

152

186

/*

153

187

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

154

188

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

155

189

* "buffer_length" is how much is already used.

156

190

*/

157

191

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

192

size_t buffer_capacity){

159

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

194

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

161

195

if(buffer == NULL){

166

200

return buffer_capacity;

167

201

}

168

202

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

169

240

/*

170

241

* Initialize GPGME.

171

242

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

174

245

gpgme_error_t rc;

175

246

gpgme_engine_info_t engine_info;

176

247

185

256

186

257

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

187

258

if(fd == -1){

188

perror("open");

259

perror_plus("open");

189

260

return false;

190

261

}

191

262

192

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

264

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

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267

return false;

197

268

}

198

269

199

270

rc = gpgme_op_import(mc.ctx, pgp_data);

200

271

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

203

274

return false;

204

275

}

205

276

206

277

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

207

278

if(ret == -1){

208

perror("close");

279

perror_plus("close");

209

280

}

210

281

gpgme_data_release(pgp_data);

211

282

return true;

212

283

}

213

284

214

285

if(debug){

215

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

286

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

216

287

}

217

288

218

289

/* Init GPGME */

219

290

gpgme_check_version(NULL);

220

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

292

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

224

295

return false;

225

296

}

226

297

227

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

298

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

228

299

rc = gpgme_get_engine_info(&engine_info);

229

300

if(rc != GPG_ERR_NO_ERROR){

230

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

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gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

232

303

return false;

233

304

}

234

305

while(engine_info != NULL){

240

311

engine_info = engine_info->next;

241

312

}

242

313

if(engine_info == NULL){

243

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

314

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

315

tempdir);

244

316

return false;

245

317

}

246

318

247

319

/* Create new GPGME "context" */

248

320

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

249

321

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

252

325

return false;

253

326

}

254

327

273

346

ssize_t plaintext_length = 0;

274

347

275

348

if(debug){

276

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

349

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

277

350

}

278

351

279

352

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

280

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

354

0);

282

355

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

285

358

return -1;

286

359

}

287

360

288

361

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

289

362

rc = gpgme_data_new(&dh_plain);

290

363

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

293

367

gpgme_data_release(dh_crypto);

294

368

return -1;

295

369

}

298

372

data buffer */

299

373

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

300

374

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

303

377

plaintext_length = -1;

304

378

if(debug){

305

379

gpgme_decrypt_result_t result;

306

380

result = gpgme_op_decrypt_result(mc.ctx);

307

381

if(result == NULL){

308

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

382

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

309

383

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

314

388

if(result->file_name != NULL){

315

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

389

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

316

390

}

317

391

gpgme_recipient_t recipient;

318

392

recipient = result->recipients;

319

393

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

326

401

recipient = recipient->next;

327

402

}

328

403

}

331

406

}

332

407

333

408

if(debug){

334

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

409

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

335

410

}

336

411

337

412

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

338

413

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

339

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

340

415

plaintext_length = -1;

341

416

goto decrypt_end;

342

417

}

344

419

*plaintext = NULL;

345

420

while(true){

346

421

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

349

424

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

353

428

}

354

429

355

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

435

break;

361

436

}

362

437

if(ret < 0){

363

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

364

439

plaintext_length = -1;

365

440

goto decrypt_end;

366

441

}

368

443

}

369

444

370

445

if(debug){

371

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

446

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

372

447

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

373

448

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

374

449

}

396

471

/* GnuTLS log function callback */

397

472

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

398

473

const char* string){

399

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

474

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

400

475

}

401

476

402

477

static int init_gnutls_global(const char *pubkeyfilename,

404

479

int ret;

405

480

406

481

if(debug){

407

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

482

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

408

483

}

409

484

410

485

ret = gnutls_global_init();

411

486

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

414

489

return -1;

415

490

}

416

491

423

498

}

424

499

425

500

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

502

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

433

505

gnutls_global_deinit();

434

506

return -1;

435

507

}

436

508

437

509

if(debug){

438

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

439

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

440

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

441

514

}

442

515

443

516

ret = gnutls_certificate_set_openpgp_key_file

444

517

(mc.cred, pubkeyfilename, seckeyfilename,

445

518

GNUTLS_OPENPGP_FMT_BASE64);

446

519

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

452

525

goto globalfail;

453

526

}

454

527

455

528

/* GnuTLS server initialization */

456

529

ret = gnutls_dh_params_init(&mc.dh_params);

457

530

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

460

534

goto globalfail;

461

535

}

462

536

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

463

537

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

466

540

goto globalfail;

467

541

}

468

542

488

562

}

489

563

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

490

564

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

493

568

}

494

569

495

570

{

502

577

}

503

578

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

504

579

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

580

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

581

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

582

safer_gnutls_strerror(ret));

508

583

gnutls_deinit(*session);

509

584

return -1;

510

585

}

519

594

}

520

595

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

521

596

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

524

599

gnutls_deinit(*session);

525

600

return -1;

526

601

}

571

646

pf = PF_INET;

572

647

break;

573

648

default:

574

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

649

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

575

650

errno = EINVAL;

576

651

return -1;

577

652

}

582

657

}

583

658

584

659

if(debug){

585

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

586

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

587

662

}

588

663

589

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

665

if(tcp_sd < 0){

591

666

int e = errno;

592

perror("socket");

667

perror_plus("socket");

593

668

errno = e;

594

669

goto mandos_end;

595

670

}

609

684

}

610

685

if(ret < 0 ){

611

686

int e = errno;

612

perror("inet_pton");

687

perror_plus("inet_pton");

613

688

errno = e;

614

689

goto mandos_end;

615

690

}

616

691

if(ret == 0){

617

692

int e = errno;

618

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

693

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

619

694

errno = e;

620

695

goto mandos_end;

621

696

}

626

701

627

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

703

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

629

-Wunreachable-code*/

704

-Wunreachable-code*/

630

705

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

633

708

errno = EINVAL;

634

709

goto mandos_end;

635

710

}

651

726

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

652

727

char interface[IF_NAMESIZE];

653

728

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

654

perror("if_indextoname");

729

perror_plus("if_indextoname");

655

730

} else {

656

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

657

ip, interface, port);

731

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

732

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

658

733

}

659

734

} else {

660

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

661

port);

735

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

736

ip, port);

662

737

}

663

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

746

sizeof(addrstr));

672

747

}

673

748

if(pcret == NULL){

674

perror("inet_ntop");

749

perror_plus("inet_ntop");

675

750

} else {

676

751

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

677

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

752

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

678

753

}

679

754

}

680

755

}

692

767

if(ret < 0){

693

768

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

694

769

int e = errno;

695

perror("connect");

770

perror_plus("connect");

696

771

errno = e;

697

772

}

698

773

goto mandos_end;

708

783

while(true){

709

784

size_t out_size = strlen(out);

710

785

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

711

out_size - written));

786

out_size - written));

712

787

if(ret == -1){

713

788

int e = errno;

714

perror("write");

789

perror_plus("write");

715

790

errno = e;

716

791

goto mandos_end;

717

792

}

734

809

}

735

810

736

811

if(debug){

737

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

812

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

738

813

}

739

814

740

815

if(quit_now){

742

817

goto mandos_end;

743

818

}

744

819

820

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

745

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

822

747

823

if(quit_now){

759

835

760

836

if(ret != GNUTLS_E_SUCCESS){

761

837

if(debug){

762

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

838

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

763

839

gnutls_perror(ret);

764

840

}

765

841

errno = EPROTO;

769

845

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

770

846

771

847

if(debug){

772

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

773

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

774

850

}

775

851

776

852

while(true){

781

857

}

782

858

783

859

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

860

buffer_capacity);

785

861

if(buffer_capacity == 0){

786

862

int e = errno;

787

perror("incbuffer");

863

perror_plus("incbuffer");

788

864

errno = e;

789

865

goto mandos_end;

790

866

}

814

890

}

815

891

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

816

892

if(ret < 0){

817

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

893

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

894

"***\n");

818

895

gnutls_perror(ret);

819

896

errno = EPROTO;

820

897

goto mandos_end;

821

898

}

822

899

break;

823

900

default:

824

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

825

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

826

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

904

errno = EIO;

828

905

goto mandos_end;

833

910

}

834

911

835

912

if(debug){

836

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

913

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

837

914

}

838

915

839

916

if(quit_now){

851

928

852

929

if(buffer_length > 0){

853

930

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

932

&decrypted_buffer);

857

933

if(decrypted_buffer_size >= 0){

858

934

869

945

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

870

946

int e = errno;

871

947

if(debug){

872

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

873

strerror(errno));

948

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

949

strerror(errno));

874

950

}

875

951

errno = e;

876

952

goto mandos_end;

895

971

if(e == 0){

896

972

e = errno;

897

973

}

898

perror("close");

974

perror_plus("close");

899

975

}

900

976

gnutls_deinit(session);

977

errno = e;

901

978

if(quit_now){

902

e = EINTR;

979

errno = EINTR;

903

980

retval = -1;

904

981

}

905

errno = e;

906

982

}

907

983

return retval;

908

984

}

933

1009

switch(event){

934

1010

default:

935

1011

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)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

939

1016

break;

940

1017

941

1018

case AVAHI_RESOLVER_FOUND:

943

1020

char ip[AVAHI_ADDRESS_STR_MAX];

944

1021

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

945

1022

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);

1023

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

1024

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

1025

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

949

1026

}

950

1027

int ret = start_mandos_communication(ip, port, interface,

951

1028

avahi_proto_to_af(proto));

952

1029

if(ret == 0){

953

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

954

1034

}

955

1035

}

956

1036

}

980

1060

default:

981

1061

case AVAHI_BROWSER_FAILURE:

982

1062

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

985

1065

avahi_simple_poll_quit(mc.simple_poll);

986

1066

return;

987

1067

994

1074

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

995

1075

name, type, domain, protocol, 0,

996

1076

resolve_callback, NULL) == NULL)

997

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

998

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

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

999

1080

break;

1000

1081

1001

1082

case AVAHI_BROWSER_REMOVE:

1004

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1087

if(debug){

1007

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

1088

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

1089

" searching...\n");

1008

1090

}

1009

1091

break;

1010

1092

}

1011

1093

}

1012

1094

1013

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

1095

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

1014

1096

static void handle_sigterm(int sig){

1015

1097

if(quit_now){

1016

1098

return;

1018

1100

quit_now = 1;

1019

1101

signal_received = sig;

1020

1102

int old_errno = errno;

1103

/* set main loop to exit */

1021

1104

if(mc.simple_poll != NULL){

1022

1105

avahi_simple_poll_quit(mc.simple_poll);

1023

1106

}

1024

1107

errno = old_errno;

1025

1108

}

1026

1109

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){

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1081

1121

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1122

perror_plus("ioctl SIOCGIFFLAGS");

1084

1123

}

1085

free(flagstring);

1086

return 0;

1124

return false;

1087

1125

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1126

return true;

1127

}

1128

1129

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

1130

1090

1131

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1133

if(debug){

1093

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

1094

if_entry->d_name);

1134

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

1135

ifname);

1095

1136

}

1096

return 0;

1137

return false;

1097

1138

}

1098

1139

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

1099

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

1140

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

1100

1141

if(debug){

1101

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

1102

if_entry->d_name);

1142

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

1143

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

1103

1144

}

1104

return 1;

1145

return true;

1105

1146

}

1106

1147

/* 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

}

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1114

1164

/* Accept this device */

1115

1165

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

if(debug){

1305

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

1306

direntry->d_name);

1307

}

1308

return 1;

1309

}

1310

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1312

int ret;

1313

struct timespec now;

1314

struct timespec waited_time;

1315

intmax_t block_time;

1316

1317

while(true){

1318

if(mc.current_server == NULL){

1319

if (debug){

1320

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

1321

" No timeout!\n");

1322

}

1323

ret = avahi_simple_poll_iterate(s, -1);

1324

} else {

1325

if (debug){

1326

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

1327

" it, or wait\n");

1328

}

1329

/* the current time */

1330

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1331

if(ret == -1){

1332

perror_plus("clock_gettime");

1333

return -1;

1334

}

1335

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

1336

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

1337

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1339

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1341

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

1342

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

1343

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

1344

block_time = ((retry_interval

1345

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

1346

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

1347

1348

if (debug){

1349

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

1350

block_time);

1351

}

1352

1353

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1358

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1360

return 0;

1361

}

1362

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1364

if(ret == -1){

1365

perror_plus("clock_gettime");

1366

return -1;

1367

}

1368

mc.current_server = mc.current_server->next;

1369

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

1370

servers, but don't block */

1371

}

1372

1373

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

1374

}

1375

if(ret != 0){

1376

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

1377

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

1378

}

1379

}

1380

}

1381

}

1382

1383

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

1384

const float delay){

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1390

if(numhooks == -1){

1391

perror_plus("scandir");

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1399

perror_plus("asprintf");

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1444

free(delaystring);

1445

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

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

1120

1484

}

1121

1485

1122

1486

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

1141

1505

bool gnutls_initialized = false;

1142

1506

bool gpgme_initialized = false;

1143

1507

float delay = 2.5f;

1508

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

1509

retrying the same server again */

1144

1510

1145

1511

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1512

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1518

errno = 0;

1153

1519

ret = setgid(gid);

1154

1520

if(ret == -1){

1155

perror("setgid");

1521

perror_plus("setgid");

1156

1522

}

1157

1523

1158

1524

/* Lower user privileges (temporarily) */

1159

1525

errno = 0;

1160

1526

ret = seteuid(uid);

1161

1527

if(ret == -1){

1162

perror("seteuid");

1528

perror_plus("seteuid");

1163

1529

}

1164

1530

1165

1531

if(quit_now){

1200

1566

.arg = "SECONDS",

1201

1567

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

1202

1568

.group = 2 },

1569

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

1570

.arg = "SECONDS",

1571

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

1572

.group = 2 },

1573

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

1574

.arg = "DIR",

1575

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

1576

.group = 2 },

1203

1577

/*

1204

1578

* These reproduce what we would get without ARGP_NO_HELP

1205

1579

*/

1249

1623

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

1250

1624

argp_error(state, "Bad delay");

1251

1625

}

1626

case 132: /* --retry */

1627

errno = 0;

1628

retry_interval = strtod(arg, &tmp);

1629

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

1630

or (retry_interval * 1000) > INT_MAX

1631

or retry_interval < 0){

1632

argp_error(state, "Bad retry interval");

1633

}

1634

break;

1635

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

1636

hookdir = arg;

1252

1637

break;

1253

1638

/*

1254

1639

* These reproduce what we would get without ARGP_NO_HELP

1261

1646

argp_state_help(state, state->out_stream,

1262

1647

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1648

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

1264

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

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

1265

1652

exit(argp_err_exit_status);

1266

1653

break;

1267

1654

default:

1282

1669

case ENOMEM:

1283

1670

default:

1284

1671

errno = ret;

1285

perror("argp_parse");

1672

perror_plus("argp_parse");

1286

1673

exitcode = EX_OSERR;

1287

1674

goto end;

1288

1675

case EINVAL:

1290

1677

goto end;

1291

1678

}

1292

1679

}

1680

1681

if(getuid() == 0){

1682

/* Work around Debian bug #633582:

1683

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

1684

struct stat st;

1685

1686

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

1740

}

1741

}

1742

1743

/* Run network hooks */

1744

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

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

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

1764

}

1293

1765

1294

1766

if(not debug){

1295

1767

avahi_set_log_function(empty_log);

1296

1768

}

1297

1769

1298

1770

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

1299

1771

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1302

1781

if(ret >= 1){

1303

/* Pick the first good interface */

1782

/* Pick the first interface returned */

1304

1783

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

1305

1784

if(debug){

1306

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

1785

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

1307

1786

}

1308

1787

if(interface == NULL){

1309

perror("malloc");

1788

perror_plus("malloc");

1310

1789

free(direntries);

1311

1790

exitcode = EXIT_FAILURE;

1312

1791

goto end;

1314

1793

free(direntries);

1315

1794

} else {

1316

1795

free(direntries);

1317

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

1796

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

1318

1797

exitcode = EXIT_FAILURE;

1319

1798

goto end;

1320

1799

}

1326

1805

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

1327

1806

mc.simple_poll = avahi_simple_poll_new();

1328

1807

if(mc.simple_poll == NULL){

1329

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

1808

fprintf_plus(stderr,

1809

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

1330

1810

exitcode = EX_UNAVAILABLE;

1331

1811

goto end;

1332

1812

}

1334

1814

sigemptyset(&sigterm_action.sa_mask);

1335

1815

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

1336

1816

if(ret == -1){

1337

perror("sigaddset");

1817

perror_plus("sigaddset");

1338

1818

exitcode = EX_OSERR;

1339

1819

goto end;

1340

1820

}

1341

1821

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

1342

1822

if(ret == -1){

1343

perror("sigaddset");

1823

perror_plus("sigaddset");

1344

1824

exitcode = EX_OSERR;

1345

1825

goto end;

1346

1826

}

1347

1827

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

1348

1828

if(ret == -1){

1349

perror("sigaddset");

1829

perror_plus("sigaddset");

1350

1830

exitcode = EX_OSERR;

1351

1831

goto end;

1352

1832

}

1356

1836

*/

1357

1837

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

1358

1838

if(ret == -1){

1359

perror("sigaction");

1839

perror_plus("sigaction");

1360

1840

return EX_OSERR;

1361

1841

}

1362

1842

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1843

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

1364

1844

if(ret == -1){

1365

perror("sigaction");

1845

perror_plus("sigaction");

1366

1846

exitcode = EX_OSERR;

1367

1847

goto end;

1368

1848

}

1369

1849

}

1370

1850

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

1371

1851

if(ret == -1){

1372

perror("sigaction");

1852

perror_plus("sigaction");

1373

1853

return EX_OSERR;

1374

1854

}

1375

1855

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1856

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

1377

1857

if(ret == -1){

1378

perror("sigaction");

1858

perror_plus("sigaction");

1379

1859

exitcode = EX_OSERR;

1380

1860

goto end;

1381

1861

}

1382

1862

}

1383

1863

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

1384

1864

if(ret == -1){

1385

perror("sigaction");

1865

perror_plus("sigaction");

1386

1866

return EX_OSERR;

1387

1867

}

1388

1868

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1869

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

1390

1870

if(ret == -1){

1391

perror("sigaction");

1871

perror_plus("sigaction");

1392

1872

exitcode = EX_OSERR;

1393

1873

goto end;

1394

1874

}

1398

1878

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

1399

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1880

if(if_index == 0){

1401

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

1881

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

1402

1882

exitcode = EX_UNAVAILABLE;

1403

1883

goto end;

1404

1884

}

1411

1891

errno = 0;

1412

1892

ret = seteuid(0);

1413

1893

if(ret == -1){

1414

perror("seteuid");

1894

perror_plus("seteuid");

1415

1895

}

1416

1896

1417

1897

#ifdef __linux__

1421

1901

bool restore_loglevel = true;

1422

1902

if(ret == -1){

1423

1903

restore_loglevel = false;

1424

perror("klogctl");

1904

perror_plus("klogctl");

1425

1905

}

1426

1906

#endif /* __linux__ */

1427

1907

1428

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1909

if(sd < 0){

1430

perror("socket");

1910

perror_plus("socket");

1431

1911

exitcode = EX_OSERR;

1432

1912

#ifdef __linux__

1433

1913

if(restore_loglevel){

1434

1914

ret = klogctl(7, NULL, 0);

1435

1915

if(ret == -1){

1436

perror("klogctl");

1916

perror_plus("klogctl");

1437

1917

}

1438

1918

}

1439

1919

#endif /* __linux__ */

1441

1921

errno = 0;

1442

1922

ret = seteuid(uid);

1443

1923

if(ret == -1){

1444

perror("seteuid");

1924

perror_plus("seteuid");

1445

1925

}

1446

1926

goto end;

1447

1927

}

1448

1928

strcpy(network.ifr_name, interface);

1449

1929

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

1450

1930

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1931

perror_plus("ioctl SIOCGIFFLAGS");

1452

1932

#ifdef __linux__

1453

1933

if(restore_loglevel){

1454

1934

ret = klogctl(7, NULL, 0);

1455

1935

if(ret == -1){

1456

perror("klogctl");

1936

perror_plus("klogctl");

1457

1937

}

1458

1938

}

1459

1939

#endif /* __linux__ */

1462

1942

errno = 0;

1463

1943

ret = seteuid(uid);

1464

1944

if(ret == -1){

1465

perror("seteuid");

1945

perror_plus("seteuid");

1466

1946

}

1467

1947

goto end;

1468

1948

}

1472

1952

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

1473

1953

if(ret == -1){

1474

1954

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1956

exitcode = EX_OSERR;

1477

1957

#ifdef __linux__

1478

1958

if(restore_loglevel){

1479

1959

ret = klogctl(7, NULL, 0);

1480

1960

if(ret == -1){

1481

perror("klogctl");

1961

perror_plus("klogctl");

1482

1962

}

1483

1963

}

1484

1964

#endif /* __linux__ */

1486

1966

errno = 0;

1487

1967

ret = seteuid(uid);

1488

1968

if(ret == -1){

1489

perror("seteuid");

1969

perror_plus("seteuid");

1490

1970

}

1491

1971

goto end;

1492

1972

}

1493

1973

}

1494

/* sleep checking until interface is running */

1974

/* Sleep checking until interface is running.

1975

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

1495

1976

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

1496

1977

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

1497

1978

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1979

perror_plus("ioctl SIOCGIFFLAGS");

1499

1980

} else if(network.ifr_flags & IFF_RUNNING){

1500

1981

break;

1501

1982

}

1502

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1984

ret = nanosleep(&sleeptime, NULL);

1504

1985

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

1505

perror("nanosleep");

1986

perror_plus("nanosleep");

1506

1987

}

1507

1988

}

1508

1989

if(not take_down_interface){

1509

1990

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

1510

1991

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

1511

1992

if(ret == -1){

1512

perror("close");

1993

perror_plus("close");

1513

1994

}

1514

1995

}

1515

1996

#ifdef __linux__

1517

1998

/* Restores kernel loglevel to default */

1518

1999

ret = klogctl(7, NULL, 0);

1519

2000

if(ret == -1){

1520

perror("klogctl");

2001

perror_plus("klogctl");

1521

2002

}

1522

2003

}

1523

2004

#endif /* __linux__ */

1524

2005

/* Lower privileges */

1525

2006

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

}

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

1538

2011

}

1539

2012

}

1540

2013

1544

2017

1545

2018

ret = init_gnutls_global(pubkey, seckey);

1546

2019

if(ret == -1){

1547

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

2020

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

1548

2021

exitcode = EX_UNAVAILABLE;

1549

2022

goto end;

1550

2023

} else {

1555

2028

goto end;

1556

2029

}

1557

2030

2031

if(mkdtemp(tempdir) == NULL){

2032

perror_plus("mkdtemp");

2033

goto end;

2034

}

1558

2035

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2036

1565

2037

if(quit_now){

1566

2038

goto end;

1567

2039

}

1568

2040

1569

2041

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

1570

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

2042

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

1571

2043

exitcode = EX_UNAVAILABLE;

1572

2044

goto end;

1573

2045

} else {

1583

2055

/* (Mainly meant for debugging) */

1584

2056

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

1585

2057

if(address == NULL){

1586

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

2058

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

1587

2059

exitcode = EX_USAGE;

1588

2060

goto end;

1589

2061

}

1597

2069

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

1598

2070

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

1599

2071

or tmpmax != (uint16_t)tmpmax){

1600

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

2072

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

1601

2073

exitcode = EX_USAGE;

1602

2074

goto end;

1603

2075

}

1608

2080

1609

2081

port = (uint16_t)tmpmax;

1610

2082

*address = '\0';

1611

address = connect_to;

1612

2083

/* Colon in address indicates IPv6 */

1613

2084

int af;

1614

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

2085

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

1615

2086

af = AF_INET6;

2087

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

2088

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

2089

{

2090

connect_to++;

2091

address[-1] = '\0';

2092

}

1616

2093

} else {

1617

2094

af = AF_INET;

1618

2095

}

2096

address = connect_to;

1619

2097

1620

2098

if(quit_now){

1621

2099

goto end;

1622

2100

}

1623

2101

1624

2102

while(not quit_now){

1625

2103

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

1626

2104

if(quit_now or ret == 0){

1627

2105

break;

1628

2106

}

1629

sleep(15);

1630

};

1631

2107

if(debug){

2108

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

2109

(int)retry_interval);

2110

}

2111

sleep((int)retry_interval);

2112

}

2113

1632

2114

if (not quit_now){

1633

2115

exitcode = EXIT_SUCCESS;

1634

2116

}

1635

2117

1636

2118

goto end;

1637

2119

}

1638

2120

1660

2142

1661

2143

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

1662

2144

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2145

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

2146

avahi_strerror(error));

1665

2147

exitcode = EX_UNAVAILABLE;

1666

2148

goto end;

1667

2149

}

1675

2157

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2158

NULL, 0, browse_callback, NULL);

1677

2159

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2160

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

2161

avahi_strerror(avahi_server_errno(mc.server)));

1680

2162

exitcode = EX_UNAVAILABLE;

1681

2163

goto end;

1682

2164

}

1688

2170

/* Run the main loop */

1689

2171

1690

2172

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2173

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

2174

}

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2178

if(debug){

2179

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

2180

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

2181

}

1695

2182

1696

2183

end:

1697

2184

1698

2185

if(debug){

1699

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

2186

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

1700

2187

}

1701

2188

1702

2189

/* Cleanup things */

1719

2206

gpgme_release(mc.ctx);

1720

2207

}

1721

2208

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

2209

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

2210

has seen */

2211

if(mc.current_server != NULL){

2212

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

2213

while(mc.current_server != NULL){

2214

server *next = mc.current_server->next;

2215

free(mc.current_server);

2216

mc.current_server = next;

2217

}

2218

}

2219

2220

/* Re-raise priviliges */

2221

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

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

1731

2235

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

1732

2236

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

1735

2239

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

1736

2240

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

1737

2241

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2243

}

1740

2244

}

1741

2245

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

1742

2246

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");

1750

}

2247

perror_plus("close");

2248

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

1751

2257

}

1752

2258

}

1753

2259

1754

/* Removes the temp directory used by GPGME */

2260

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

1755

2261

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

}

2262

struct dirent **direntries = NULL;

2263

struct dirent *direntry = NULL;

2264

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

2265

alphasort);

2266

if (numentries > 0){

2267

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

2268

direntry = direntries[i];

1776

2269

char *fullname = NULL;

1777

2270

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

1778

2271

direntry->d_name);

1779

2272

if(ret < 0){

1780

perror("asprintf");

2273

perror_plus("asprintf");

1781

2274

continue;

1782

2275

}

1783

2276

ret = remove(fullname);

1784

2277

if(ret == -1){

1785

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

1786

strerror(errno));

2278

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

2279

strerror(errno));

1787

2280

}

1788

2281

free(fullname);

1789

2282

}

1790

closedir(d);

2283

}

2284

2285

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

2286

free(direntries);

2287

if (numentries == -1){

2288

perror_plus("scandir");

1791

2289

}

1792

2290

ret = rmdir(tempdir);

1793

2291

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

1794

perror("rmdir");

2292

perror_plus("rmdir");

1795

2293

}

1796

2294

}

1797

2295

1802

2300

&old_sigterm_action,

1803

2301

NULL));

1804

2302

if(ret == -1){

1805

perror("sigaction");

2303

perror_plus("sigaction");

1806

2304

}

1807

2305

do {

1808

2306

ret = raise(signal_received);

1809

2307

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

1810

2308

if(ret != 0){

1811

perror("raise");

2309

perror_plus("raise");

1812

2310

abort();

1813

2311

}

1814

2312

TEMP_FAILURE_RETRY(pause());