/mandos/trunk : revision 487

9

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

10

*

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* Everything else is

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13

12

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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*/

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32

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

53

sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

56

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

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

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

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inet_pton(), connect() */

59

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

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*/

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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(), _exit() */

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setgid(), pause() */

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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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raise() */

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

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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() */

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

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#ifdef __linux__

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90

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

111

108

init_gnutls_session(),

112

109

GNUTLS_* */

113

110

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

116

113

117

114

/* GPGME */

118

115

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

126

123

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

127

124

#define SECKEY "seckey.txt"

128

125

#define PUBKEY "pubkey.txt"

129

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

130

126

131

127

bool debug = false;

132

128

static const char mandos_protocol_version[] = "1";

133

129

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

134

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

130

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

135

131

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

136

132

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

133

139

134

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

140

135

typedef struct server{

170

165

171

166

/* Function to use when printing errors */

172

167

void perror_plus(const char *print_text){

173

int e = errno;

174

168

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

175

169

program_invocation_short_name);

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errno = e;

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170

perror(print_text);

178

171

}

179

172

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

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program_invocation_short_name));

187

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

188

}

189

190

173

/*

191

174

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

192

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

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* "buffer_length" is how much is already used.

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*/

195

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

197

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

181

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

199

182

if(buffer == NULL){

204

187

return buffer_capacity;

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188

}

206

189

207

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

208

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

209

int af){

190

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

210

193

int ret;

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194

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

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195

if(new_server == NULL){

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196

perror_plus("malloc");

214

return false;

197

return -1;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

220

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if(new_server->ip == NULL){

221

204

perror_plus("strdup");

222

return false;

205

return -1;

223

206

}

224

/* Special case of first server */

207

/* unique case of first server */

225

208

if (mc.current_server == NULL){

226

209

new_server->next = new_server;

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210

new_server->prev = new_server;

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211

mc.current_server = new_server;

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

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

230

213

} else {

231

214

new_server->next = mc.current_server;

232

215

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

236

219

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

237

220

if(ret == -1){

238

221

perror_plus("clock_gettime");

239

return false;

222

return -1;

240

223

}

241

return true;

224

return 0;

242

225

}

243

226

244

227

/*

245

228

* Initialize GPGME.

246

229

*/

247

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

248

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

249

232

gpgme_error_t rc;

250

233

gpgme_engine_info_t engine_info;

251

234

266

249

267

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

251

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

271

254

return false;

272

255

}

273

256

274

257

rc = gpgme_op_import(mc.ctx, pgp_data);

275

258

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

278

261

return false;

279

262

}

280

263

287

270

}

288

271

289

272

if(debug){

290

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

273

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

291

274

}

292

275

293

276

/* Init GPGME */

294

277

gpgme_check_version(NULL);

295

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

279

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

299

282

return false;

300

283

}

301

284

302

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

285

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

303

286

rc = gpgme_get_engine_info(&engine_info);

304

287

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

307

290

return false;

308

291

}

309

292

while(engine_info != NULL){

315

298

engine_info = engine_info->next;

316

299

}

317

300

if(engine_info == NULL){

318

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

319

tempdir);

301

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

320

302

return false;

321

303

}

322

304

323

305

/* Create new GPGME "context" */

324

306

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

325

307

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

329

310

return false;

330

311

}

331

312

350

331

ssize_t plaintext_length = 0;

351

332

352

333

if(debug){

353

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

334

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

354

335

}

355

336

356

337

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

357

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

339

0);

359

340

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

362

343

return -1;

363

344

}

364

345

365

346

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

366

347

rc = gpgme_data_new(&dh_plain);

367

348

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

371

351

gpgme_data_release(dh_crypto);

372

352

return -1;

373

353

}

376

356

data buffer */

377

357

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

378

358

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

381

361

plaintext_length = -1;

382

362

if(debug){

383

363

gpgme_decrypt_result_t result;

384

364

result = gpgme_op_decrypt_result(mc.ctx);

385

365

if(result == NULL){

386

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

366

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

387

367

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

392

372

if(result->file_name != NULL){

393

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

373

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

394

374

}

395

375

gpgme_recipient_t recipient;

396

376

recipient = result->recipients;

397

377

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

405

384

recipient = recipient->next;

406

385

}

407

386

}

410

389

}

411

390

412

391

if(debug){

413

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

392

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

414

393

}

415

394

416

395

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

423

402

*plaintext = NULL;

424

403

while(true){

425

404

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

428

407

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

432

411

}

433

412

434

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

447

426

}

448

427

449

428

if(debug){

450

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

429

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

451

430

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

452

431

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

453

432

}

475

454

/* GnuTLS log function callback */

476

455

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

477

456

const char* string){

478

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

457

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

479

458

}

480

459

481

460

static int init_gnutls_global(const char *pubkeyfilename,

483

462

int ret;

484

463

485

464

if(debug){

486

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

465

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

487

466

}

488

467

489

468

ret = gnutls_global_init();

490

469

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

493

472

return -1;

494

473

}

495

474

504

483

/* OpenPGP credentials */

505

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

485

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

509

488

gnutls_global_deinit();

510

489

return -1;

511

490

}

512

491

513

492

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

493

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

494

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

495

seckeyfilename);

518

496

}

519

497

520

498

ret = gnutls_certificate_set_openpgp_key_file

521

499

(mc.cred, pubkeyfilename, seckeyfilename,

522

500

GNUTLS_OPENPGP_FMT_BASE64);

523

501

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

529

507

goto globalfail;

530

508

}

531

509

532

510

/* GnuTLS server initialization */

533

511

ret = gnutls_dh_params_init(&mc.dh_params);

534

512

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

513

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

514

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

538

515

goto globalfail;

539

516

}

540

517

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

541

518

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

544

521

goto globalfail;

545

522

}

546

523

566

543

}

567

544

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

568

545

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

572

548

}

573

549

574

550

{

581

557

}

582

558

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

583

559

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

587

563

gnutls_deinit(*session);

588

564

return -1;

589

565

}

598

574

}

599

575

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

600

576

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

603

579

gnutls_deinit(*session);

604

580

return -1;

605

581

}

650

626

pf = PF_INET;

651

627

break;

652

628

default:

653

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

629

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

654

630

errno = EINVAL;

655

631

return -1;

656

632

}

661

637

}

662

638

663

639

if(debug){

664

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

665

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

666

642

}

667

643

668

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

694

670

}

695

671

if(ret == 0){

696

672

int e = errno;

697

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

673

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

698

674

errno = e;

699

675

goto mandos_end;

700

676

}

705

681

706

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

683

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

708

-Wunreachable-code*/

684

-Wunreachable-code*/

709

685

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

712

688

errno = EINVAL;

713

689

goto mandos_end;

714

690

}

732

708

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

733

709

perror_plus("if_indextoname");

734

710

} else {

735

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

736

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

711

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

712

ip, interface, port);

737

713

}

738

714

} else {

739

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

740

ip, port);

715

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

716

port);

741

717

}

742

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

753

729

perror_plus("inet_ntop");

754

730

} else {

755

731

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

756

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

732

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

757

733

}

758

734

}

759

735

}

787

763

while(true){

788

764

size_t out_size = strlen(out);

789

765

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

790

out_size - written));

766

out_size - written));

791

767

if(ret == -1){

792

768

int e = errno;

793

769

perror_plus("write");

813

789

}

814

790

815

791

if(debug){

816

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

792

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

817

793

}

818

794

819

795

if(quit_now){

839

815

840

816

if(ret != GNUTLS_E_SUCCESS){

841

817

if(debug){

842

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

818

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

843

819

gnutls_perror(ret);

844

820

}

845

821

errno = EPROTO;

849

825

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

850

826

851

827

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

828

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

829

ip);

854

830

}

855

831

856

832

while(true){

861

837

}

862

838

863

839

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

840

buffer_capacity);

865

841

if(buffer_capacity == 0){

866

842

int e = errno;

867

843

perror_plus("incbuffer");

894

870

}

895

871

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

896

872

if(ret < 0){

897

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

898

"***\n");

873

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

899

874

gnutls_perror(ret);

900

875

errno = EPROTO;

901

876

goto mandos_end;

902

877

}

903

878

break;

904

879

default:

905

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

906

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

907

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

883

errno = EIO;

909

884

goto mandos_end;

914

889

}

915

890

916

891

if(debug){

917

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

892

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

918

893

}

919

894

920

895

if(quit_now){

932

907

933

908

if(buffer_length > 0){

934

909

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

936

912

&decrypted_buffer);

937

913

if(decrypted_buffer_size >= 0){

938

914

949

925

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

950

926

int e = errno;

951

927

if(debug){

952

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

953

strerror(errno));

928

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

929

strerror(errno));

954

930

}

955

931

errno = e;

956

932

goto mandos_end;

1013

989

switch(event){

1014

990

default:

1015

991

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1020

995

break;

1021

996

1022

997

case AVAHI_RESOLVER_FOUND:

1024

999

char ip[AVAHI_ADDRESS_STR_MAX];

1025

1000

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

1026

1001

if(debug){

1027

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

1028

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

1029

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1030

1005

}

1031

1006

int ret = start_mandos_communication(ip, port, interface,

1032

1007

avahi_proto_to_af(proto));

1033

1008

if(ret == 0){

1034

1009

avahi_simple_poll_quit(mc.simple_poll);

1035

1010

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1041

1013

}

1042

1014

}

1043

1015

}

1067

1039

default:

1068

1040

case AVAHI_BROWSER_FAILURE:

1069

1041

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1072

1044

avahi_simple_poll_quit(mc.simple_poll);

1073

1045

return;

1074

1046

1081

1053

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

1082

1054

name, type, domain, protocol, 0,

1083

1055

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1056

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

1057

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

1087

1058

break;

1088

1059

1089

1060

case AVAHI_BROWSER_REMOVE:

1092

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

1065

if(debug){

1095

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

1096

" searching...\n");

1066

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

1097

1067

}

1098

1068

break;

1099

1069

}

1114

1084

errno = old_errno;

1115

1085

}

1116

1086

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1128

1143

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1130

1146

}

1131

return false;

1147

free(flagstring);

1148

return 0;

1132

1149

}

1133

return true;

1134

}

1135

1136

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

1137

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1138

1152

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1140

1154

if(debug){

1141

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

1142

ifname);

1155

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

1156

if_entry->d_name);

1143

1157

}

1144

return false;

1158

return 0;

1145

1159

}

1146

1160

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

1147

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

1161

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

1148

1162

if(debug){

1149

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

1150

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

1163

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

1164

if_entry->d_name);

1151

1165

}

1152

return true;

1166

return 1;

1153

1167

}

1154

1168

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

1155

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

1169

if(not (flags & IFF_BROADCAST)){

1156

1170

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1171

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

1172

if_entry->d_name);

1159

1173

}

1160

return false;

1174

return 0;

1161

1175

}

1162

1176

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

1163

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1164

1178

if(debug){

1165

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

1166

ifname);

1179

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

1180

if_entry->d_name);

1167

1181

}

1168

return false;

1182

return 0;

1169

1183

}

1170

1171

1184

/* Accept this device */

1172

1185

if(debug){

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1186

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

1187

if_entry->d_name);

1242

1188

}

1243

1189

return 1;

1244

1190

}

1254

1200

return 1;

1255

1201

}

1256

1202

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

1204

int ret;

1320

1205

struct timespec now;

1321

1206

struct timespec waited_time;

1322

1207

intmax_t block_time;

1323

1208

1324

1209

while(true){

1325

1210

if(mc.current_server == NULL){

1326

1211

if (debug){

1327

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

1328

" No timeout!\n");

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1329

1214

}

1330

1215

ret = avahi_simple_poll_iterate(s, -1);

1331

1216

} else {

1332

1217

if (debug){

1333

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

1334

" it, or wait\n");

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1335

1220

}

1336

1221

/* the current time */

1337

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1351

1236

block_time = ((retry_interval

1352

1237

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

1353

1238

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

1354

1239

1355

1240

if (debug){

1356

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

1357

block_time);

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1358

1242

}

1359

1243

1360

1244

if(block_time <= 0){

1361

1245

ret = start_mandos_communication(mc.current_server->ip,

1362

1246

mc.current_server->port,

1380

1264

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

1381

1265

}

1382

1266

if(ret != 0){

1383

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

1267

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

1384

1268

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

1385

1269

}

1386

1270

}

1387

1271

}

1388

1272

}

1389

1273

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

ret = setenv("CONNECT", connect_to, 1);

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1526

1274

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

1527

1275

AvahiSServiceBrowser *sb = NULL;

1528

1276

int error;

1608

1356

.group = 2 },

1609

1357

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

1610

1358

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1359

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

1616

1360

.group = 2 },

1617

1361

/*

1618

1362

* These reproduce what we would get without ARGP_NO_HELP

1667

1411

errno = 0;

1668

1412

retry_interval = strtod(arg, &tmp);

1669

1413

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

1670

or (retry_interval * 1000) > INT_MAX

1671

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1672

1415

argp_error(state, "Bad retry interval");

1673

1416

}

1674

1417

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

1418

/*

1679

1419

* These reproduce what we would get without ARGP_NO_HELP

1680

1420

*/

1686

1426

argp_state_help(state, state->out_stream,

1687

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

1428

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

1689

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

1429

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

1690

1430

exit(argp_err_exit_status);

1691

1431

break;

1692

1432

default:

1719

1459

{

1720

1460

/* Work around Debian bug #633582:

1721

1461

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

1462

struct stat st;

1722

1463

1723

1464

/* Re-raise priviliges */

1724

1465

errno = 0;

1725

1466

ret = seteuid(0);

1726

1467

if(ret == -1){

1727

1468

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

1785

1513

}

1786

1514

1787

1515

if(not debug){

1788

1516

avahi_set_log_function(empty_log);

1789

1517

}

1790

1518

1791

1519

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

1792

1520

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1522

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

1523

if(ret >= 1){

1803

/* Pick the first interface returned */

1524

/* Pick the first good interface */

1804

1525

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

1805

1526

if(debug){

1806

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

1527

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

1807

1528

}

1808

1529

if(interface == NULL){

1809

1530

perror_plus("malloc");

1814

1535

free(direntries);

1815

1536

} else {

1816

1537

free(direntries);

1817

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

1538

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

1818

1539

exitcode = EXIT_FAILURE;

1819

1540

goto end;

1820

1541

}

1826

1547

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

1827

1548

mc.simple_poll = avahi_simple_poll_new();

1828

1549

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1550

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

1831

1551

exitcode = EX_UNAVAILABLE;

1832

1552

goto end;

1833

1553

}

1899

1619

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

1900

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1621

if(if_index == 0){

1902

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

1622

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

1903

1623

exitcode = EX_UNAVAILABLE;

1904

1624

goto end;

1905

1625

}

2025

1745

#endif /* __linux__ */

2026

1746

/* Lower privileges */

2027

1747

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

2032

1760

}

2033

1761

}

2034

1762

2038

1766

2039

1767

ret = init_gnutls_global(pubkey, seckey);

2040

1768

if(ret == -1){

2041

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

1769

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

2042

1770

exitcode = EX_UNAVAILABLE;

2043

1771

goto end;

2044

1772

} else {

2060

1788

}

2061

1789

2062

1790

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

2063

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

1791

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

2064

1792

exitcode = EX_UNAVAILABLE;

2065

1793

goto end;

2066

1794

} else {

2076

1804

/* (Mainly meant for debugging) */

2077

1805

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

2078

1806

if(address == NULL){

2079

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

1807

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

2080

1808

exitcode = EX_USAGE;

2081

1809

goto end;

2082

1810

}

2090

1818

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

2091

1819

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

2092

1820

or tmpmax != (uint16_t)tmpmax){

2093

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

1821

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

2094

1822

exitcode = EX_USAGE;

2095

1823

goto end;

2096

1824

}

2101

1829

2102

1830

port = (uint16_t)tmpmax;

2103

1831

*address = '\0';

1832

address = connect_to;

2104

1833

/* Colon in address indicates IPv6 */

2105

1834

int af;

2106

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

1835

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

2107

1836

af = AF_INET6;

2108

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

2109

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

2110

{

2111

connect_to++;

2112

address[-1] = '\0';

2113

}

2114

1837

} else {

2115

1838

af = AF_INET;

2116

1839

}

2117

address = connect_to;

2118

1840

2119

1841

if(quit_now){

2120

1842

goto end;

2121

1843

}

2122

1844

2123

1845

while(not quit_now){

2124

1846

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

2125

1847

if(quit_now or ret == 0){

2126

1848

break;

2127

1849

}

2128

if(debug){

2129

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

2130

(int)retry_interval);

2131

}

2132

sleep((int)retry_interval);

2133

}

2134

1850

sleep((int)retry_interval or 1);

1851

};

1852

2135

1853

if (not quit_now){

2136

1854

exitcode = EXIT_SUCCESS;

2137

1855

}

2138

1856

2139

1857

goto end;

2140

1858

}

2141

1859

2163

1881

2164

1882

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

2165

1883

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

1884

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

1885

avahi_strerror(error));

2168

1886

exitcode = EX_UNAVAILABLE;

2169

1887

goto end;

2170

1888

}

2178

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

1897

NULL, 0, browse_callback, NULL);

2180

1898

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2183

1901

exitcode = EX_UNAVAILABLE;

2184

1902

goto end;

2185

1903

}

2191

1909

/* Run the main loop */

2192

1910

2193

1911

if(debug){

2194

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

1912

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

2195

1913

}

2196

1914

2197

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

1916

(int)(retry_interval * 1000));

2199

1917

if(debug){

2200

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

2201

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

1918

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

1919

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

2202

1920

}

2203

1921

2204

1922

end:

2205

1923

2206

1924

if(debug){

2207

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

1925

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

2208

1926

}

2209

1927

2210

1928

/* Cleanup things */

2226

1944

if(gpgme_initialized){

2227

1945

gpgme_release(mc.ctx);

2228

1946

}

2229

1947

2230

1948

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

2231

1949

has seen */

2232

1950

if(mc.current_server != NULL){

2238

1956

}

2239

1957

}

2240

1958

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2245

{

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

2246

1962

errno = 0;

2247

1963

ret = seteuid(0);

2248

1964

if(ret == -1){

2249

1965

perror_plus("seteuid");

2250

1966

}

2251

2252

/* Take down the network interface */

2253

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

1967

if(geteuid() == 0){

2254

1968

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

2255

1969

if(ret == -1){

2256

1970

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

1971

} else if(network.ifr_flags & IFF_UP) {

2258

1972

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

2259

1973

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

2260

1974

if(ret == -1){

2265

1979

if(ret == -1){

2266

1980

perror_plus("close");

2267

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

2268

1988

}

2269

1989

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

1990

2277

1991

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

2278

1992

if(tempdir_created){

2279

1993

struct dirent **direntries = NULL;

2280

1994

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2285

1998

direntry = direntries[i];

2286

1999

char *fullname = NULL;

2287

2000

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

2292

2005

}

2293

2006

ret = remove(fullname);

2294

2007

if(ret == -1){

2295

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

2296

strerror(errno));

2008

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

2009

strerror(errno));

2297

2010

}

2298

2011

free(fullname);

2299

2012

}

2300

2013

}

2301

2014

2302

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

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2303

2017

free(direntries);

2304

if (numentries == -1){

2018

if (ret == -1){

2305

2019

perror_plus("scandir");

2306

2020

}

2307

2021

ret = rmdir(tempdir);