/mandos/release : revision 237.7.13

9

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

10

*

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* Everything else is

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13

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*

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

16

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

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* along with this program. If not, see

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

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*

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

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

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*/

31

32

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

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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(), S_ISREG */

56

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

57

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

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inet_pton(), connect() */

59

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

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

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strtoimax() */

64

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

65

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

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program_invocation_short_name */

65

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

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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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68

SIOCSIFFLAGS, if_indextoname(),

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73

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

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74

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

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75

setgid(), pause() */

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

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

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

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78

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

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argp_state, struct argp,

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84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

87

91

88

#ifdef __linux__

92

89

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

110

107

init_gnutls_session(),

111

108

GNUTLS_* */

112

109

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

115

112

116

113

/* GPGME */

117

114

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

125

122

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

126

123

#define SECKEY "seckey.txt"

127

124

#define PUBKEY "pubkey.txt"

128

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

129

125

130

126

bool debug = false;

131

127

static const char mandos_protocol_version[] = "1";

132

128

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

133

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

129

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

134

130

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

135

131

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

148

132

149

133

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

150

134

typedef struct {

155

139

gnutls_dh_params_t dh_params;

156

140

const char *priority;

157

141

gpgme_ctx_t ctx;

158

server *current_server;

159

142

} mandos_context;

160

143

161

144

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

162

145

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

163

146

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

147

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

166

148

167

149

sig_atomic_t quit_now = 0;

168

150

int signal_received = 0;

169

151

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

186

152

/*

187

153

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

188

154

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

189

155

* "buffer_length" is how much is already used.

190

156

*/

191

157

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

158

size_t buffer_capacity){

193

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

160

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

195

161

if(buffer == NULL){

200

166

return buffer_capacity;

201

167

}

202

168

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

240

169

/*

241

170

* Initialize GPGME.

242

171

*/

243

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

244

const char *tempdir){

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

245

174

gpgme_error_t rc;

246

175

gpgme_engine_info_t engine_info;

247

176

256

185

257

186

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

258

187

if(fd == -1){

259

perror_plus("open");

188

perror("open");

260

189

return false;

261

190

}

262

191

263

192

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

193

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

267

196

return false;

268

197

}

269

198

270

199

rc = gpgme_op_import(mc.ctx, pgp_data);

271

200

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

274

203

return false;

275

204

}

276

205

277

206

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

278

207

if(ret == -1){

279

perror_plus("close");

208

perror("close");

280

209

}

281

210

gpgme_data_release(pgp_data);

282

211

return true;

283

212

}

284

213

285

214

if(debug){

286

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

215

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

287

216

}

288

217

289

218

/* Init GPGME */

290

219

gpgme_check_version(NULL);

291

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

221

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

295

224

return false;

296

225

}

297

226

298

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

227

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

299

228

rc = gpgme_get_engine_info(&engine_info);

300

229

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

303

232

return false;

304

233

}

305

234

while(engine_info != NULL){

311

240

engine_info = engine_info->next;

312

241

}

313

242

if(engine_info == NULL){

314

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

315

tempdir);

243

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

316

244

return false;

317

245

}

318

246

319

247

/* Create new GPGME "context" */

320

248

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

321

249

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

325

252

return false;

326

253

}

327

254

346

273

ssize_t plaintext_length = 0;

347

274

348

275

if(debug){

349

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

276

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

350

277

}

351

278

352

279

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

353

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

281

0);

355

282

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

358

285

return -1;

359

286

}

360

287

361

288

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

362

289

rc = gpgme_data_new(&dh_plain);

363

290

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

367

293

gpgme_data_release(dh_crypto);

368

294

return -1;

369

295

}

372

298

data buffer */

373

299

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

374

300

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

377

303

plaintext_length = -1;

378

304

if(debug){

379

305

gpgme_decrypt_result_t result;

380

306

result = gpgme_op_decrypt_result(mc.ctx);

381

307

if(result == NULL){

382

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

308

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

383

309

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

388

314

if(result->file_name != NULL){

389

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

315

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

390

316

}

391

317

gpgme_recipient_t recipient;

392

318

recipient = result->recipients;

393

319

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

401

326

recipient = recipient->next;

402

327

}

403

328

}

406

331

}

407

332

408

333

if(debug){

409

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

334

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

410

335

}

411

336

412

337

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

413

338

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

414

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

415

340

plaintext_length = -1;

416

341

goto decrypt_end;

417

342

}

419

344

*plaintext = NULL;

420

345

while(true){

421

346

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

424

349

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

428

353

}

429

354

430

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

360

break;

436

361

}

437

362

if(ret < 0){

438

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

439

364

plaintext_length = -1;

440

365

goto decrypt_end;

441

366

}

443

368

}

444

369

445

370

if(debug){

446

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

371

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

447

372

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

448

373

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

449

374

}

471

396

/* GnuTLS log function callback */

472

397

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

473

398

const char* string){

474

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

399

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

475

400

}

476

401

477

402

static int init_gnutls_global(const char *pubkeyfilename,

479

404

int ret;

480

405

481

406

if(debug){

482

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

407

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

483

408

}

484

409

485

410

ret = gnutls_global_init();

486

411

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

489

414

return -1;

490

415

}

491

416

498

423

}

499

424

500

425

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

502

427

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

505

433

gnutls_global_deinit();

506

434

return -1;

507

435

}

508

436

509

437

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

438

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

439

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

440

seckeyfilename);

514

441

}

515

442

516

443

ret = gnutls_certificate_set_openpgp_key_file

517

444

(mc.cred, pubkeyfilename, seckeyfilename,

518

445

GNUTLS_OPENPGP_FMT_BASE64);

519

446

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

525

452

goto globalfail;

526

453

}

527

454

528

455

/* GnuTLS server initialization */

529

456

ret = gnutls_dh_params_init(&mc.dh_params);

530

457

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

458

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

459

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

534

460

goto globalfail;

535

461

}

536

462

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

537

463

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

540

466

goto globalfail;

541

467

}

542

468

562

488

}

563

489

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

564

490

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

568

493

}

569

494

570

495

{

577

502

}

578

503

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

579

504

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

583

508

gnutls_deinit(*session);

584

509

return -1;

585

510

}

594

519

}

595

520

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

596

521

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

599

524

gnutls_deinit(*session);

600

525

return -1;

601

526

}

646

571

pf = PF_INET;

647

572

break;

648

573

default:

649

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

574

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

650

575

errno = EINVAL;

651

576

return -1;

652

577

}

657

582

}

658

583

659

584

if(debug){

660

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

661

PRIu16 "\n", ip, port);

585

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

586

"\n", ip, port);

662

587

}

663

588

664

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

590

if(tcp_sd < 0){

666

591

int e = errno;

667

perror_plus("socket");

592

perror("socket");

668

593

errno = e;

669

594

goto mandos_end;

670

595

}

684

609

}

685

610

if(ret < 0 ){

686

611

int e = errno;

687

perror_plus("inet_pton");

612

perror("inet_pton");

688

613

errno = e;

689

614

goto mandos_end;

690

615

}

691

616

if(ret == 0){

692

617

int e = errno;

693

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

618

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

694

619

errno = e;

695

620

goto mandos_end;

696

621

}

701

626

702

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

628

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

704

-Wunreachable-code*/

629

-Wunreachable-code*/

705

630

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

708

633

errno = EINVAL;

709

634

goto mandos_end;

710

635

}

726

651

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

727

652

char interface[IF_NAMESIZE];

728

653

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

729

perror_plus("if_indextoname");

654

perror("if_indextoname");

730

655

} else {

731

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

732

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

656

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

657

ip, interface, port);

733

658

}

734

659

} else {

735

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

736

ip, port);

660

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

661

port);

737

662

}

738

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

671

sizeof(addrstr));

747

672

}

748

673

if(pcret == NULL){

749

perror_plus("inet_ntop");

674

perror("inet_ntop");

750

675

} else {

751

676

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

752

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

677

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

753

678

}

754

679

}

755

680

}

767

692

if(ret < 0){

768

693

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

769

694

int e = errno;

770

perror_plus("connect");

695

perror("connect");

771

696

errno = e;

772

697

}

773

698

goto mandos_end;

783

708

while(true){

784

709

size_t out_size = strlen(out);

785

710

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

786

out_size - written));

711

out_size - written));

787

712

if(ret == -1){

788

713

int e = errno;

789

perror_plus("write");

714

perror("write");

790

715

errno = e;

791

716

goto mandos_end;

792

717

}

809

734

}

810

735

811

736

if(debug){

812

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

737

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

813

738

}

814

739

815

740

if(quit_now){

817

742

goto mandos_end;

818

743

}

819

744

820

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

821

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

746

823

747

if(quit_now){

835

759

836

760

if(ret != GNUTLS_E_SUCCESS){

837

761

if(debug){

838

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

762

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

839

763

gnutls_perror(ret);

840

764

}

841

765

errno = EPROTO;

845

769

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

846

770

847

771

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

772

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

773

ip);

850

774

}

851

775

852

776

while(true){

857

781

}

858

782

859

783

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

784

buffer_capacity);

861

785

if(buffer_capacity == 0){

862

786

int e = errno;

863

perror_plus("incbuffer");

787

perror("incbuffer");

864

788

errno = e;

865

789

goto mandos_end;

866

790

}

890

814

}

891

815

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

892

816

if(ret < 0){

893

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

894

"***\n");

817

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

895

818

gnutls_perror(ret);

896

819

errno = EPROTO;

897

820

goto mandos_end;

898

821

}

899

822

break;

900

823

default:

901

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

902

" encrypted session with Mandos server\n");

824

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

825

" encrypted session with Mandos server\n");

903

826

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

827

errno = EIO;

905

828

goto mandos_end;

910

833

}

911

834

912

835

if(debug){

913

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

836

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

914

837

}

915

838

916

839

if(quit_now){

928

851

929

852

if(buffer_length > 0){

930

853

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

932

856

&decrypted_buffer);

933

857

if(decrypted_buffer_size >= 0){

934

858

945

869

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

946

870

int e = errno;

947

871

if(debug){

948

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

949

strerror(errno));

872

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

873

strerror(errno));

950

874

}

951

875

errno = e;

952

876

goto mandos_end;

971

895

if(e == 0){

972

896

e = errno;

973

897

}

974

perror_plus("close");

898

perror("close");

975

899

}

976

900

gnutls_deinit(session);

977

errno = e;

978

901

if(quit_now){

979

errno = EINTR;

902

e = EINTR;

980

903

retval = -1;

981

904

}

905

errno = e;

982

906

}

983

907

return retval;

984

908

}

1009

933

switch(event){

1010

934

default:

1011

935

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

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)));

1016

939

break;

1017

940

1018

941

case AVAHI_RESOLVER_FOUND:

1020

943

char ip[AVAHI_ADDRESS_STR_MAX];

1021

944

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

1022

945

if(debug){

1023

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

1024

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

1025

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

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);

1026

949

}

1027

950

int ret = start_mandos_communication(ip, port, interface,

1028

951

avahi_proto_to_af(proto));

1029

952

if(ret == 0){

1030

953

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

954

}

1035

955

}

1036

956

}

1060

980

default:

1061

981

case AVAHI_BROWSER_FAILURE:

1062

982

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1065

985

avahi_simple_poll_quit(mc.simple_poll);

1066

986

return;

1067

987

1074

994

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

1075

995

name, type, domain, protocol, 0,

1076

996

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

997

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

998

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

1080

999

break;

1081

1000

1082

1001

case AVAHI_BROWSER_REMOVE:

1085

1004

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1005

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1006

if(debug){

1088

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

1089

" searching...\n");

1007

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

1090

1008

}

1091

1009

break;

1092

1010

}

1093

1011

}

1094

1012

1095

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

1013

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

1096

1014

static void handle_sigterm(int sig){

1097

1015

if(quit_now){

1098

1016

return;

1100

1018

quit_now = 1;

1101

1019

signal_received = sig;

1102

1020

int old_errno = errno;

1103

/* set main loop to exit */

1104

1021

if(mc.simple_poll != NULL){

1105

1022

avahi_simple_poll_quit(mc.simple_poll);

1106

1023

}

1107

1024

errno = old_errno;

1108

1025

}

1109

1026

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){

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){

1121

1081

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1082

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

1083

flagstring, if_entry->d_name);

1123

1084

}

1124

return false;

1085

free(flagstring);

1086

return 0;

1125

1087

}

1126

return true;

1127

}

1128

1129

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

1130

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

1090

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1091

if(flags & IFF_LOOPBACK){

1133

1092

if(debug){

1134

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

1135

ifname);

1093

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

1094

if_entry->d_name);

1136

1095

}

1137

return false;

1096

return 0;

1138

1097

}

1139

1098

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

1140

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

1099

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

1141

1100

if(debug){

1142

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

1143

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

1101

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

1102

if_entry->d_name);

1144

1103

}

1145

return true;

1104

return 1;

1146

1105

}

1147

1106

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

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

}

1164

1114

/* Accept this device */

1165

1115

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

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;

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1484

1120

}

1485

1121

1486

1122

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

1505

1141

bool gnutls_initialized = false;

1506

1142

bool gpgme_initialized = false;

1507

1143

float delay = 2.5f;

1508

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

1509

retrying the same server again */

1510

1144

1511

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1512

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1518

1152

errno = 0;

1519

1153

ret = setgid(gid);

1520

1154

if(ret == -1){

1521

perror_plus("setgid");

1155

perror("setgid");

1522

1156

}

1523

1157

1524

1158

/* Lower user privileges (temporarily) */

1525

1159

errno = 0;

1526

1160

ret = seteuid(uid);

1527

1161

if(ret == -1){

1528

perror_plus("seteuid");

1162

perror("seteuid");

1529

1163

}

1530

1164

1531

1165

if(quit_now){

1566

1200

.arg = "SECONDS",

1567

1201

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

1568

1202

.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 },

1577

1203

/*

1578

1204

* These reproduce what we would get without ARGP_NO_HELP

1579

1205

*/

1623

1249

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

1624

1250

argp_error(state, "Bad delay");

1625

1251

}

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;

1637

1252

break;

1638

1253

/*

1639

1254

* These reproduce what we would get without ARGP_NO_HELP

1646

1261

argp_state_help(state, state->out_stream,

1647

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

1263

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

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

1264

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

1652

1265

exit(argp_err_exit_status);

1653

1266

break;

1654

1267

default:

1669

1282

case ENOMEM:

1670

1283

default:

1671

1284

errno = ret;

1672

perror_plus("argp_parse");

1285

perror("argp_parse");

1673

1286

exitcode = EX_OSERR;

1674

1287

goto end;

1675

1288

case EINVAL:

1677

1290

goto end;

1678

1291

}

1679

1292

}

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

}

1765

1293

1766

1294

if(not debug){

1767

1295

avahi_set_log_function(empty_log);

1768

1296

}

1769

1297

1770

1298

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

1771

1299

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1774

1301

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

}

1781

1302

if(ret >= 1){

1782

/* Pick the first interface returned */

1303

/* Pick the first good interface */

1783

1304

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

1784

1305

if(debug){

1785

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

1306

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

1786

1307

}

1787

1308

if(interface == NULL){

1788

perror_plus("malloc");

1309

perror("malloc");

1789

1310

free(direntries);

1790

1311

exitcode = EXIT_FAILURE;

1791

1312

goto end;

1793

1314

free(direntries);

1794

1315

} else {

1795

1316

free(direntries);

1796

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

1317

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

1797

1318

exitcode = EXIT_FAILURE;

1798

1319

goto end;

1799

1320

}

1805

1326

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

1806

1327

mc.simple_poll = avahi_simple_poll_new();

1807

1328

if(mc.simple_poll == NULL){

1808

fprintf_plus(stderr,

1809

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

1329

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

1810

1330

exitcode = EX_UNAVAILABLE;

1811

1331

goto end;

1812

1332

}

1814

1334

sigemptyset(&sigterm_action.sa_mask);

1815

1335

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

1816

1336

if(ret == -1){

1817

perror_plus("sigaddset");

1337

perror("sigaddset");

1818

1338

exitcode = EX_OSERR;

1819

1339

goto end;

1820

1340

}

1821

1341

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

1822

1342

if(ret == -1){

1823

perror_plus("sigaddset");

1343

perror("sigaddset");

1824

1344

exitcode = EX_OSERR;

1825

1345

goto end;

1826

1346

}

1827

1347

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

1828

1348

if(ret == -1){

1829

perror_plus("sigaddset");

1349

perror("sigaddset");

1830

1350

exitcode = EX_OSERR;

1831

1351

goto end;

1832

1352

}

1836

1356

*/

1837

1357

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

1838

1358

if(ret == -1){

1839

perror_plus("sigaction");

1359

perror("sigaction");

1840

1360

return EX_OSERR;

1841

1361

}

1842

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1843

1363

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

1844

1364

if(ret == -1){

1845

perror_plus("sigaction");

1365

perror("sigaction");

1846

1366

exitcode = EX_OSERR;

1847

1367

goto end;

1848

1368

}

1849

1369

}

1850

1370

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

1851

1371

if(ret == -1){

1852

perror_plus("sigaction");

1372

perror("sigaction");

1853

1373

return EX_OSERR;

1854

1374

}

1855

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1856

1376

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

1857

1377

if(ret == -1){

1858

perror_plus("sigaction");

1378

perror("sigaction");

1859

1379

exitcode = EX_OSERR;

1860

1380

goto end;

1861

1381

}

1862

1382

}

1863

1383

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

1864

1384

if(ret == -1){

1865

perror_plus("sigaction");

1385

perror("sigaction");

1866

1386

return EX_OSERR;

1867

1387

}

1868

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1869

1389

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

1870

1390

if(ret == -1){

1871

perror_plus("sigaction");

1391

perror("sigaction");

1872

1392

exitcode = EX_OSERR;

1873

1393

goto end;

1874

1394

}

1878

1398

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

1879

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

1400

if(if_index == 0){

1881

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

1401

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

1882

1402

exitcode = EX_UNAVAILABLE;

1883

1403

goto end;

1884

1404

}

1891

1411

errno = 0;

1892

1412

ret = seteuid(0);

1893

1413

if(ret == -1){

1894

perror_plus("seteuid");

1414

perror("seteuid");

1895

1415

}

1896

1416

1897

1417

#ifdef __linux__

1901

1421

bool restore_loglevel = true;

1902

1422

if(ret == -1){

1903

1423

restore_loglevel = false;

1904

perror_plus("klogctl");

1424

perror("klogctl");

1905

1425

}

1906

1426

#endif /* __linux__ */

1907

1427

1908

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

1429

if(sd < 0){

1910

perror_plus("socket");

1430

perror("socket");

1911

1431

exitcode = EX_OSERR;

1912

1432

#ifdef __linux__

1913

1433

if(restore_loglevel){

1914

1434

ret = klogctl(7, NULL, 0);

1915

1435

if(ret == -1){

1916

perror_plus("klogctl");

1436

perror("klogctl");

1917

1437

}

1918

1438

}

1919

1439

#endif /* __linux__ */

1921

1441

errno = 0;

1922

1442

ret = seteuid(uid);

1923

1443

if(ret == -1){

1924

perror_plus("seteuid");

1444

perror("seteuid");

1925

1445

}

1926

1446

goto end;

1927

1447

}

1928

1448

strcpy(network.ifr_name, interface);

1929

1449

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

1930

1450

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1932

1452

#ifdef __linux__

1933

1453

if(restore_loglevel){

1934

1454

ret = klogctl(7, NULL, 0);

1935

1455

if(ret == -1){

1936

perror_plus("klogctl");

1456

perror("klogctl");

1937

1457

}

1938

1458

}

1939

1459

#endif /* __linux__ */

1942

1462

errno = 0;

1943

1463

ret = seteuid(uid);

1944

1464

if(ret == -1){

1945

perror_plus("seteuid");

1465

perror("seteuid");

1946

1466

}

1947

1467

goto end;

1948

1468

}

1952

1472

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

1953

1473

if(ret == -1){

1954

1474

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1956

1476

exitcode = EX_OSERR;

1957

1477

#ifdef __linux__

1958

1478

if(restore_loglevel){

1959

1479

ret = klogctl(7, NULL, 0);

1960

1480

if(ret == -1){

1961

perror_plus("klogctl");

1481

perror("klogctl");

1962

1482

}

1963

1483

}

1964

1484

#endif /* __linux__ */

1966

1486

errno = 0;

1967

1487

ret = seteuid(uid);

1968

1488

if(ret == -1){

1969

perror_plus("seteuid");

1489

perror("seteuid");

1970

1490

}

1971

1491

goto end;

1972

1492

}

1973

1493

}

1974

/* Sleep checking until interface is running.

1975

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

1494

/* sleep checking until interface is running */

1976

1495

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

1977

1496

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

1978

1497

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1980

1499

} else if(network.ifr_flags & IFF_RUNNING){

1981

1500

break;

1982

1501

}

1983

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

1503

ret = nanosleep(&sleeptime, NULL);

1985

1504

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

1986

perror_plus("nanosleep");

1505

perror("nanosleep");

1987

1506

}

1988

1507

}

1989

1508

if(not take_down_interface){

1990

1509

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

1991

1510

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

1992

1511

if(ret == -1){

1993

perror_plus("close");

1512

perror("close");

1994

1513

}

1995

1514

}

1996

1515

#ifdef __linux__

1998

1517

/* Restores kernel loglevel to default */

1999

1518

ret = klogctl(7, NULL, 0);

2000

1519

if(ret == -1){

2001

perror_plus("klogctl");

1520

perror("klogctl");

2002

1521

}

2003

1522

}

2004

1523

#endif /* __linux__ */

2005

1524

/* Lower privileges */

2006

1525

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

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

}

2011

1538

}

2012

1539

}

2013

1540

2017

1544

2018

1545

ret = init_gnutls_global(pubkey, seckey);

2019

1546

if(ret == -1){

2020

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

1547

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

2021

1548

exitcode = EX_UNAVAILABLE;

2022

1549

goto end;

2023

1550

} else {

2028

1555

goto end;

2029

1556

}

2030

1557

1558

tempdir_created = true;

2031

1559

if(mkdtemp(tempdir) == NULL){

2032

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

2033

1562

goto end;

2034

1563

}

2035

tempdir_created = true;

2036

1564

2037

1565

if(quit_now){

2038

1566

goto end;

2039

1567

}

2040

1568

2041

1569

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

2042

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

1570

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

2043

1571

exitcode = EX_UNAVAILABLE;

2044

1572

goto end;

2045

1573

} else {

2055

1583

/* (Mainly meant for debugging) */

2056

1584

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

2057

1585

if(address == NULL){

2058

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

1586

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

2059

1587

exitcode = EX_USAGE;

2060

1588

goto end;

2061

1589

}

2069

1597

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

2070

1598

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

2071

1599

or tmpmax != (uint16_t)tmpmax){

2072

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

1600

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

2073

1601

exitcode = EX_USAGE;

2074

1602

goto end;

2075

1603

}

2080

1608

2081

1609

port = (uint16_t)tmpmax;

2082

1610

*address = '\0';

1611

address = connect_to;

2083

1612

/* Colon in address indicates IPv6 */

2084

1613

int af;

2085

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

1614

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

2086

1615

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

}

2093

1616

} else {

2094

1617

af = AF_INET;

2095

1618

}

2096

address = connect_to;

2097

1619

2098

1620

if(quit_now){

2099

1621

goto end;

2100

1622

}

2101

1623

2102

1624

while(not quit_now){

2103

1625

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

2104

1626

if(quit_now or ret == 0){

2105

1627

break;

2106

1628

}

2107

if(debug){

2108

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

2109

(int)retry_interval);

2110

}

2111

sleep((int)retry_interval);

2112

}

2113

1629

sleep(15);

1630

};

1631

2114

1632

if (not quit_now){

2115

1633

exitcode = EXIT_SUCCESS;

2116

1634

}

2117

1635

2118

1636

goto end;

2119

1637

}

2120

1638

2142

1660

2143

1661

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

2144

1662

if(mc.server == NULL){

2145

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

2146

avahi_strerror(error));

1663

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

1664

avahi_strerror(error));

2147

1665

exitcode = EX_UNAVAILABLE;

2148

1666

goto end;

2149

1667

}

2157

1675

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

1676

NULL, 0, browse_callback, NULL);

2159

1677

if(sb == NULL){

2160

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

2161

avahi_strerror(avahi_server_errno(mc.server)));

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2162

1680

exitcode = EX_UNAVAILABLE;

2163

1681

goto end;

2164

1682

}

2170

1688

/* Run the main loop */

2171

1689

2172

1690

if(debug){

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

}

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2182

1695

2183

1696

end:

2184

1697

2185

1698

if(debug){

2186

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

1699

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

2187

1700

}

2188

1701

2189

1702

/* Cleanup things */

2206

1719

gpgme_release(mc.ctx);

2207

1720

}

2208

1721

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){

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){

2235

1731

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

2236

1732

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2239

1735

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

2240

1736

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

2241

1737

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2243

1739

}

2244

1740

}

2245

1741

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

2246

1742

if(ret == -1){

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");

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

2257

1751

}

2258

1752

}

2259

1753

2260

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

1754

/* Removes the temp directory used by GPGME */

2261

1755

if(tempdir_created){

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];

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

}

2269

1776

char *fullname = NULL;

2270

1777

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

2271

1778

direntry->d_name);

2272

1779

if(ret < 0){

2273

perror_plus("asprintf");

1780

perror("asprintf");

2274

1781

continue;

2275

1782

}

2276

1783

ret = remove(fullname);

2277

1784

if(ret == -1){

2278

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

2279

strerror(errno));

1785

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

1786

strerror(errno));

2280

1787

}

2281

1788

free(fullname);

2282

1789

}

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");

1790

closedir(d);

2289

1791

}

2290

1792

ret = rmdir(tempdir);

2291

1793

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

2292

perror_plus("rmdir");

1794

perror("rmdir");

2293

1795

}

2294

1796

}

2295

1797

2300

1802

&old_sigterm_action,

2301

1803

NULL));

2302

1804

if(ret == -1){

2303

perror_plus("sigaction");

1805

perror("sigaction");

2304

1806

}

2305

1807

do {

2306

1808

ret = raise(signal_received);

2307

1809

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

2308

1810

if(ret != 0){

2309

perror_plus("raise");

1811

perror("raise");

2310

1812

abort();

2311

1813

}

2312

1814

TEMP_FAILURE_RETRY(pause());