/mandos/trunk : revision 594.1.3

9

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

10

*

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* Everything else is

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13

12

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*

15

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

16

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

41

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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*/

74

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

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

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setgid(), pause() */

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

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

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

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

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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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91

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#ifdef __linux__

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93

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

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111

init_gnutls_session(),

109

112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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116

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/* GPGME */

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

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134

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

132

135

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

133

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

uid_t uid = 65534;

139

gid_t gid = 65534;

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140

135

141

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

136

142

typedef struct server{

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172

167

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/* Function to use when printing errors */

168

174

void perror_plus(const char *print_text){

175

int e = errno;

169

176

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

170

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program_invocation_short_name);

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errno = e;

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179

perror(print_text);

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180

}

173

181

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

183

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

184

va_list ap;

185

va_start (ap, format);

186

187

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

188

program_invocation_short_name));

189

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

190

}

191

174

192

/*

175

193

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

176

194

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

177

195

* "buffer_length" is how much is already used.

178

196

*/

179

197

size_t incbuffer(char **buffer, size_t buffer_length,

180

size_t buffer_capacity){

198

size_t buffer_capacity){

181

199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

200

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

183

201

if(buffer == NULL){

189

207

}

190

208

191

209

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

192

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

210

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

211

int af){

195

212

int ret;

196

213

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

197

214

if(new_server == NULL){

198

215

perror_plus("malloc");

199

return -1;

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return false;

200

217

}

201

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

202

.port = port,

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.if_index = if_index,

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.af = af };

219

.port = port,

220

.if_index = if_index,

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.af = af };

205

222

if(new_server->ip == NULL){

206

223

perror_plus("strdup");

207

return -1;

224

return false;

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225

}

209

226

/* Special case of first server */

210

227

if (mc.current_server == NULL){

221

238

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

222

239

if(ret == -1){

223

240

perror_plus("clock_gettime");

224

return -1;

241

return false;

225

242

}

226

return 0;

243

return true;

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244

}

228

245

229

246

/*

230

247

* Initialize GPGME.

231

248

*/

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

249

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

250

const char *tempdir){

234

251

gpgme_error_t rc;

235

252

gpgme_engine_info_t engine_info;

236

253

251

268

252

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

270

if(rc != GPG_ERR_NO_ERROR){

254

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

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gpgme_strsource(rc), gpgme_strerror(rc));

271

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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273

return false;

257

274

}

258

275

259

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rc = gpgme_op_import(mc.ctx, pgp_data);

260

277

if(rc != GPG_ERR_NO_ERROR){

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

263

280

return false;

264

281

}

265

282

272

289

}

273

290

274

291

if(debug){

275

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

292

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

276

293

}

277

294

278

295

/* Init GPGME */

279

296

gpgme_check_version(NULL);

280

297

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

298

if(rc != GPG_ERR_NO_ERROR){

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

284

301

return false;

285

302

}

286

303

287

304

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

288

305

rc = gpgme_get_engine_info(&engine_info);

289

306

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

292

309

return false;

293

310

}

294

311

while(engine_info != NULL){

300

317

engine_info = engine_info->next;

301

318

}

302

319

if(engine_info == NULL){

303

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

320

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

321

tempdir);

304

322

return false;

305

323

}

306

324

307

325

/* Create new GPGME "context" */

308

326

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

309

327

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

312

331

return false;

313

332

}

314

333

352

ssize_t plaintext_length = 0;

334

353

335

354

if(debug){

336

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

355

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

337

356

}

338

357

339

358

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

340

359

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

360

0);

342

361

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

345

364

return -1;

346

365

}

347

366

348

367

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

349

368

rc = gpgme_data_new(&dh_plain);

350

369

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

353

373

gpgme_data_release(dh_crypto);

354

374

return -1;

355

375

}

358

378

data buffer */

359

379

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

360

380

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

363

383

plaintext_length = -1;

364

384

if(debug){

365

385

gpgme_decrypt_result_t result;

366

386

result = gpgme_op_decrypt_result(mc.ctx);

367

387

if(result == NULL){

368

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

388

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

369

389

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

390

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

391

result->unsupported_algorithm);

392

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

393

result->wrong_key_usage);

374

394

if(result->file_name != NULL){

375

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

395

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

376

396

}

377

397

gpgme_recipient_t recipient;

378

398

recipient = result->recipients;

379

399

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

400

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

404

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

386

407

recipient = recipient->next;

387

408

}

388

409

}

391

412

}

392

413

393

414

if(debug){

394

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

415

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

395

416

}

396

417

397

418

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

404

425

*plaintext = NULL;

405

426

while(true){

406

427

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

409

430

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

413

434

}

414

435

415

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

449

}

429

450

430

451

if(debug){

431

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

452

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

432

453

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

433

454

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

434

455

}

456

477

/* GnuTLS log function callback */

457

478

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

458

479

const char* string){

459

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

480

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

460

481

}

461

482

462

483

static int init_gnutls_global(const char *pubkeyfilename,

464

485

int ret;

465

486

466

487

if(debug){

467

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

488

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

468

489

}

469

490

470

491

ret = gnutls_global_init();

471

492

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

474

495

return -1;

475

496

}

476

497

485

506

/* OpenPGP credentials */

486

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

487

508

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

490

511

gnutls_global_deinit();

491

512

return -1;

492

513

}

493

514

494

515

if(debug){

495

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

496

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

497

seckeyfilename);

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

498

520

}

499

521

500

522

ret = gnutls_certificate_set_openpgp_key_file

501

523

(mc.cred, pubkeyfilename, seckeyfilename,

502

524

GNUTLS_OPENPGP_FMT_BASE64);

503

525

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

509

531

goto globalfail;

510

532

}

511

533

512

534

/* GnuTLS server initialization */

513

535

ret = gnutls_dh_params_init(&mc.dh_params);

514

536

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

517

540

goto globalfail;

518

541

}

519

542

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

520

543

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

523

546

goto globalfail;

524

547

}

525

548

545

568

}

546

569

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

547

570

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

550

574

}

551

575

552

576

{

559

583

}

560

584

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

561

585

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

586

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

587

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

588

safer_gnutls_strerror(ret));

565

589

gnutls_deinit(*session);

566

590

return -1;

567

591

}

576

600

}

577

601

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

578

602

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

581

605

gnutls_deinit(*session);

582

606

return -1;

583

607

}

628

652

pf = PF_INET;

629

653

break;

630

654

default:

631

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

655

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

632

656

errno = EINVAL;

633

657

return -1;

634

658

}

639

663

}

640

664

641

665

if(debug){

642

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

643

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

644

668

}

645

669

646

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

696

}

673

697

if(ret == 0){

674

698

int e = errno;

675

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

699

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

676

700

errno = e;

677

701

goto mandos_end;

678

702

}

683

707

684

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

709

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

686

-Wunreachable-code*/

710

-Wunreachable-code*/

687

711

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

712

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

713

" incomplete without a network interface\n");

690

714

errno = EINVAL;

691

715

goto mandos_end;

692

716

}

710

734

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

711

735

perror_plus("if_indextoname");

712

736

} else {

713

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

714

ip, interface, port);

737

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

738

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

715

739

}

716

740

} else {

717

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

718

port);

741

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

742

ip, port);

719

743

}

720

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

755

perror_plus("inet_ntop");

732

756

} else {

733

757

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

734

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

758

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

735

759

}

736

760

}

737

761

}

765

789

while(true){

766

790

size_t out_size = strlen(out);

767

791

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

768

out_size - written));

792

out_size - written));

769

793

if(ret == -1){

770

794

int e = errno;

771

795

perror_plus("write");

791

815

}

792

816

793

817

if(debug){

794

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

818

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

795

819

}

796

820

797

821

if(quit_now){

799

823

goto mandos_end;

800

824

}

801

825

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

826

/* This casting via intptr_t is to eliminate warning about casting

827

an int to a pointer type. This is exactly how the GnuTLS Guile

828

function "set-session-transport-fd!" does it. */

829

gnutls_transport_set_ptr(session,

830

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

831

805

832

if(quit_now){

806

833

errno = EINTR;

817

844

818

845

if(ret != GNUTLS_E_SUCCESS){

819

846

if(debug){

820

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

847

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

821

848

gnutls_perror(ret);

822

849

}

823

850

errno = EPROTO;

827

854

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

828

855

829

856

if(debug){

830

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

831

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

832

859

}

833

860

834

861

while(true){

839

866

}

840

867

841

868

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

869

buffer_capacity);

843

870

if(buffer_capacity == 0){

844

871

int e = errno;

845

872

perror_plus("incbuffer");

872

899

}

873

900

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

874

901

if(ret < 0){

875

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

902

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

903

"***\n");

876

904

gnutls_perror(ret);

877

905

errno = EPROTO;

878

906

goto mandos_end;

879

907

}

880

908

break;

881

909

default:

882

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

883

" encrypted session with Mandos server\n");

910

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

911

" encrypted session with Mandos server\n");

884

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

913

errno = EIO;

886

914

goto mandos_end;

891

919

}

892

920

893

921

if(debug){

894

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

922

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

895

923

}

896

924

897

925

if(quit_now){

909

937

910

938

if(buffer_length > 0){

911

939

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

914

941

&decrypted_buffer);

915

942

if(decrypted_buffer_size >= 0){

916

943

927

954

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

928

955

int e = errno;

929

956

if(debug){

930

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

931

strerror(errno));

957

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

958

strerror(errno));

932

959

}

933

960

errno = e;

934

961

goto mandos_end;

991

1018

switch(event){

992

1019

default:

993

1020

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1021

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

1022

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

1023

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

997

1025

break;

998

1026

999

1027

case AVAHI_RESOLVER_FOUND:

1001

1029

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1030

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

1003

1031

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1032

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

1033

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

1034

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

1007

1035

}

1008

1036

int ret = start_mandos_communication(ip, port, interface,

1009

1037

avahi_proto_to_af(proto));

1010

1038

if(ret == 0){

1011

1039

avahi_simple_poll_quit(mc.simple_poll);

1012

1040

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

1015

1046

}

1016

1047

}

1017

1048

}

1041

1072

default:

1042

1073

case AVAHI_BROWSER_FAILURE:

1043

1074

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1046

1077

avahi_simple_poll_quit(mc.simple_poll);

1047

1078

return;

1048

1079

1055

1086

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

1056

1087

name, type, domain, protocol, 0,

1057

1088

resolve_callback, NULL) == NULL)

1058

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

1059

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

1089

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

1090

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1060

1092

break;

1061

1093

1062

1094

case AVAHI_BROWSER_REMOVE:

1065

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1099

if(debug){

1068

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

1100

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

1101

" searching...\n");

1069

1102

}

1070

1103

break;

1071

1104

}

1110

1143

/* Reject the loopback device */

1111

1144

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1145

if(debug){

1113

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

1114

ifname);

1146

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

1147

ifname);

1115

1148

}

1116

1149

return false;

1117

1150

}

1118

1151

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

1119

1152

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

1120

1153

if(debug){

1121

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

1122

ifname);

1154

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

1155

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

1123

1156

}

1124

1157

return true;

1125

1158

}

1126

1159

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

1127

1160

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

1128

1161

if(debug){

1129

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

1130

ifname);

1162

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1163

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

1131

1164

}

1132

1165

return false;

1133

1166

}

1134

1167

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

1135

1168

if(ifr->ifr_flags & IFF_NOARP){

1136

1169

if(debug){

1137

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

1170

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

1171

ifname);

1138

1172

}

1139

1173

return false;

1140

1174

}

1141

1175

1142

1176

/* Accept this device */

1143

1177

if(debug){

1144

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

1178

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

1145

1179

}

1146

1180

return true;

1147

1181

}

1159

1193

struct ifreq ifr;

1160

1194

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

1161

1195

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1196

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

1197

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

1164

1198

}

1165

1199

return 0;

1166

1200

}

1184

1218

struct ifreq ifr;

1185

1219

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

1186

1220

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1221

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

1222

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

1189

1223

}

1190

1224

return 0;

1191

1225

}

1193

1227

/* Reject down interfaces */

1194

1228

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

1195

1229

if(debug){

1196

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

1197

if_entry->d_name);

1230

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

1231

if_entry->d_name);

1198

1232

}

1199

1233

return 0;

1200

1234

}

1202

1236

/* Reject non-running interfaces */

1203

1237

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

1204

1238

if(debug){

1205

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

1206

if_entry->d_name);

1239

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

1240

if_entry->d_name);

1207

1241

}

1208

1242

return 0;

1209

1243

}

1228

1262

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

1229

1263

int runnable_hook(const struct dirent *direntry){

1230

1264

int ret;

1265

size_t sret;

1231

1266

struct stat st;

1232

1267

1233

1268

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

1235

1270

return 0;

1236

1271

}

1237

1272

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1273

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

1274

"abcdefghijklmnopqrstuvwxyz"

1275

"0123456789"

1276

"_-");

1277

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

1278

/* Contains non-allowed characters */

1279

if(debug){

1280

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

1281

direntry->d_name);

1282

}

1283

return 0;

1284

}

1285

1286

char *fullname = NULL;

1287

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

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1255

1294

if(ret == -1){

1256

1295

if(debug){

1257

perror_plus("Could not stat plugin");

1296

perror_plus("Could not stat hook");

1258

1297

}

1259

1298

return 0;

1260

1299

}

1261

1300

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

1262

1301

/* Not a regular file */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1263

1306

return 0;

1264

1307

}

1265

1308

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

1266

1309

/* Not executable */

1310

if(debug){

1311

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

1312

direntry->d_name);

1313

}

1267

1314

return 0;

1268

1315

}

1316

if(debug){

1317

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

1318

direntry->d_name);

1319

}

1269

1320

return 1;

1270

1321

}

1271

1322

1278

1329

while(true){

1279

1330

if(mc.current_server == NULL){

1280

1331

if (debug){

1281

fprintf(stderr,

1282

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

1332

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

1333

" No timeout!\n");

1283

1334

}

1284

1335

ret = avahi_simple_poll_iterate(s, -1);

1285

1336

} else {

1286

1337

if (debug){

1287

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

1288

" or wait\n");

1338

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

1339

" it, or wait\n");

1289

1340

}

1290

1341

/* the current time */

1291

1342

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1307

1358

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

1308

1359

1309

1360

if (debug){

1310

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

1361

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

1362

block_time);

1311

1363

}

1312

1364

1313

1365

if(block_time <= 0){

1333

1385

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

1334

1386

}

1335

1387

if(ret != 0){

1336

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

1388

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

1337

1389

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

1338

1390

}

1339

1391

}

1340

1392

}

1341

1393

}

1342

1394

1395

/* Set effective uid to 0, return errno */

1396

error_t raise_privileges(void){

1397

error_t old_errno = errno;

1398

error_t ret_errno = 0;

1399

if(seteuid(0) == -1){

1400

ret_errno = errno;

1401

perror_plus("seteuid");

1402

}

1403

errno = old_errno;

1404

return ret_errno;

1405

}

1406

1407

/* Set effective and real user ID to 0. Return errno. */

1408

error_t raise_privileges_permanently(void){

1409

error_t old_errno = errno;

1410

error_t ret_errno = raise_privileges();

1411

if(ret_errno != 0){

1412

errno = old_errno;

1413

return ret_errno;

1414

}

1415

if(setuid(0) == -1){

1416

ret_errno = errno;

1417

perror_plus("seteuid");

1418

}

1419

errno = old_errno;

1420

return ret_errno;

1421

}

1422

1423

/* Set effective user ID to unprivileged saved user ID */

1424

error_t lower_privileges(void){

1425

error_t old_errno = errno;

1426

error_t ret_errno = 0;

1427

if(seteuid(uid) == -1){

1428

ret_errno = errno;

1429

perror_plus("seteuid");

1430

}

1431

errno = old_errno;

1432

return ret_errno;

1433

}

1434

1435

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

1436

const float delay){

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1442

if(numhooks == -1){

1443

perror_plus("scandir");

1444

} else {

1445

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

1446

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

1447

direntry = direntries[i];

1448

char *fullname = NULL;

1449

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

1450

if(ret < 0){

1451

perror_plus("asprintf");

1452

continue;

1453

}

1454

if(debug){

1455

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

1456

direntry->d_name);

1457

}

1458

pid_t hook_pid = fork();

1459

if(hook_pid == 0){

1460

/* Child */

1461

/* Raise privileges */

1462

raise_privileges_permanently();

1463

/* Set group */

1464

errno = 0;

1465

ret = setgid(0);

1466

if(ret == -1){

1467

perror_plus("setgid");

1468

}

1469

/* Reset supplementary groups */

1470

errno = 0;

1471

ret = setgroups(0, NULL);

1472

if(ret == -1){

1473

perror_plus("setgroups");

1474

}

1475

dup2(devnull, STDIN_FILENO);

1476

close(devnull);

1477

dup2(STDERR_FILENO, STDOUT_FILENO);

1478

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

1479

if(ret == -1){

1480

perror_plus("setenv");

1481

_exit(EX_OSERR);

1482

}

1483

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

1484

if(ret == -1){

1485

perror_plus("setenv");

1486

_exit(EX_OSERR);

1487

}

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

char *delaystring;

1499

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

1500

if(ret == -1){

1501

perror_plus("asprintf");

1502

_exit(EX_OSERR);

1503

}

1504

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

1505

if(ret == -1){

1506

free(delaystring);

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

free(delaystring);

1511

if(connect_to != NULL){

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

}

1518

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

1519

perror_plus("execl");

1520

_exit(EXIT_FAILURE);

1521

}

1522

} else {

1523

int status;

1524

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

1525

perror_plus("waitpid");

1526

free(fullname);

1527

continue;

1528

}

1529

if(WIFEXITED(status)){

1530

if(WEXITSTATUS(status) != 0){

1531

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

1532

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

1533

WEXITSTATUS(status));

1534

free(fullname);

1535

continue;

1536

}

1537

} else if(WIFSIGNALED(status)){

1538

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

1539

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

1540

WTERMSIG(status));

1541

free(fullname);

1542

continue;

1543

} else {

1544

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

1545

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

1546

free(fullname);

1547

continue;

1548

}

1549

}

1550

free(fullname);

1551

if(debug){

1552

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

1553

direntry->d_name);

1554

}

1555

}

1556

close(devnull);

1557

}

1558

return true;

1559

}

1560

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1563

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1566

int ret;

1567

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1569

if(if_index == 0){

1570

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

1571

errno = old_errno;

1572

return ENXIO;

1573

}

1574

1575

if(quit_now){

1576

errno = old_errno;

1577

return EINTR;

1578

}

1579

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

messages about the network interface to mess up the prompt */

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

if((network.ifr_flags & IFF_UP) == 0){

1630

network.ifr_flags |= IFF_UP;

1631

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

1632

if(ret == -1){

1633

ret_errno = errno;

1634

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

errno = old_errno;

1646

return ret_errno;

1647

}

1648

}

1649

/* Sleep checking until interface is running.

1650

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

1651

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1656

break;

1657

}

1658

struct timespec sleeptime = { .tv_nsec = 250000000 };

1659

ret = nanosleep(&sleeptime, NULL);

1660

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

1661

perror_plus("nanosleep");

1662

}

1663

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1680

errno = old_errno;

1681

return 0;

1682

}

1683

1343

1684

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

1344

1685

AvahiSServiceBrowser *sb = NULL;

1345

1686

int error;

1351

1692

struct ifreq network;

1352

1693

int sd = -1;

1353

1694

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

1695

char tempdir[] = "/tmp/mandosXXXXXX";

1357

1696

bool tempdir_created = false;

1358

1697

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1425

1764

.group = 2 },

1426

1765

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

1427

1766

.arg = "SECONDS",

1428

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

1767

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

1768

.group = 2 },

1769

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

1770

.arg = "DIR",

1771

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

1429

1772

.group = 2 },

1430

1773

/*

1431

1774

* These reproduce what we would get without ARGP_NO_HELP

1485

1828

argp_error(state, "Bad retry interval");

1486

1829

}

1487

1830

break;

1831

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

1832

hookdir = arg;

1833

break;

1488

1834

/*

1489

1835

* These reproduce what we would get without ARGP_NO_HELP

1490

1836

*/

1496

1842

argp_state_help(state, state->out_stream,

1497

1843

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1844

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

1499

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

1845

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

1500

1846

exit(argp_err_exit_status);

1501

1847

break;

1502

1848

default:

1529

1875

{

1530

1876

/* Work around Debian bug #633582:

1531

1877

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

1532

struct stat st;

1533

1878

1534

1879

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1880

if(raise_privileges() == 0){

1881

struct stat st;

1882

1883

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

1884

int seckey_fd = open(seckey, O_RDONLY);

1885

if(seckey_fd == -1){

1886

perror_plus("open");

1887

} else {

1888

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

1889

if(ret == -1){

1890

perror_plus("fstat");

1891

} else {

1892

if(S_ISREG(st.st_mode)

1893

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

1894

ret = fchown(seckey_fd, uid, gid);

1895

if(ret == -1){

1896

perror_plus("fchown");

1897

}

1898

}

1899

}

1900

TEMP_FAILURE_RETRY(close(seckey_fd));

1901

}

1902

}

1903

1904

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

1905

int pubkey_fd = open(pubkey, O_RDONLY);

1906

if(pubkey_fd == -1){

1907

perror_plus("open");

1908

} else {

1909

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

1910

if(ret == -1){

1911

perror_plus("fstat");

1912

} else {

1913

if(S_ISREG(st.st_mode)

1914

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

1915

ret = fchown(pubkey_fd, uid, gid);

1916

if(ret == -1){

1917

perror_plus("fchown");

1918

}

1919

}

1920

}

1921

TEMP_FAILURE_RETRY(close(pubkey_fd));

1922

}

1923

}

1924

1925

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

1930

}

1586

1931

}

1587

1932

}

1588

1933

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

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

1613

setenv("MODE", "start", 1);

1614

/* setenv( XXX more here */

1615

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

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

1620

goto end;

1621

}

1622

}

1623

close(devnull);

1934

/* Run network hooks */

1935

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

1936

goto end;

1624

1937

}

1625

1938

1626

1939

if(not debug){

1642

1955

/* Pick the first interface returned */

1643

1956

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

1644

1957

if(debug){

1645

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

1958

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

1646

1959

}

1647

1960

if(interface == NULL){

1648

1961

perror_plus("malloc");

1653

1966

free(direntries);

1654

1967

} else {

1655

1968

free(direntries);

1656

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

1969

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

1657

1970

exitcode = EXIT_FAILURE;

1658

1971

goto end;

1659

1972

}

1665

1978

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

1666

1979

mc.simple_poll = avahi_simple_poll_new();

1667

1980

if(mc.simple_poll == NULL){

1668

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

1981

fprintf_plus(stderr,

1982

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

1669

1983

exitcode = EX_UNAVAILABLE;

1670

1984

goto end;

1671

1985

}

1734

2048

}

1735

2049

1736

2050

/* If the interface is down, bring it up */

1737

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

1738

if_index = (AvahiIfIndex) if_nametoindex(interface);

1739

if(if_index == 0){

1740

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

1741

exitcode = EX_UNAVAILABLE;

1742

goto end;

1743

}

1744

1745

if(quit_now){

1746

goto end;

1747

}

1748

1749

/* Re-raise priviliges */

1750

errno = 0;

1751

ret = seteuid(0);

1752

if(ret == -1){

1753

perror_plus("seteuid");

1754

}

1755

1756

#ifdef __linux__

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

messages about the network interface to mess up the prompt */

1759

ret = klogctl(8, NULL, 5);

1760

bool restore_loglevel = true;

1761

if(ret == -1){

1762

restore_loglevel = false;

1763

perror_plus("klogctl");

1764

}

1765

#endif /* __linux__ */

1766

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1768

if(sd < 0){

1769

perror_plus("socket");

1770

exitcode = EX_OSERR;

1771

#ifdef __linux__

1772

if(restore_loglevel){

1773

ret = klogctl(7, NULL, 0);

1774

if(ret == -1){

1775

perror_plus("klogctl");

1776

}

1777

}

1778

#endif /* __linux__ */

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1785

goto end;

1786

}

1787

strcpy(network.ifr_name, interface);

1788

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

1789

if(ret == -1){

1790

perror_plus("ioctl SIOCGIFFLAGS");

1791

#ifdef __linux__

1792

if(restore_loglevel){

1793

ret = klogctl(7, NULL, 0);

1794

if(ret == -1){

1795

perror_plus("klogctl");

1796

}

1797

}

1798

#endif /* __linux__ */

1799

exitcode = EX_OSERR;

1800

/* Lower privileges */

1801

errno = 0;

1802

ret = seteuid(uid);

1803

if(ret == -1){

1804

perror_plus("seteuid");

1805

}

1806

goto end;

1807

}

1808

if((network.ifr_flags & IFF_UP) == 0){

1809

network.ifr_flags |= IFF_UP;

1810

take_down_interface = true;

1811

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

1812

if(ret == -1){

1813

take_down_interface = false;

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1815

exitcode = EX_OSERR;

1816

#ifdef __linux__

1817

if(restore_loglevel){

1818

ret = klogctl(7, NULL, 0);

1819

if(ret == -1){

1820

perror_plus("klogctl");

1821

}

1822

}

1823

#endif /* __linux__ */

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

}

1833

/* Sleep checking until interface is running.

1834

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

1835

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

1836

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

1837

if(ret == -1){

1838

perror_plus("ioctl SIOCGIFFLAGS");

1839

} else if(network.ifr_flags & IFF_RUNNING){

1840

break;

1841

}

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1843

ret = nanosleep(&sleeptime, NULL);

1844

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

1845

perror_plus("nanosleep");

1846

}

1847

}

1848

if(not take_down_interface){

1849

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

1850

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

1851

if(ret == -1){

1852

perror_plus("close");

1853

}

1854

}

1855

#ifdef __linux__

1856

if(restore_loglevel){

1857

/* Restores kernel loglevel to default */

1858

ret = klogctl(7, NULL, 0);

1859

if(ret == -1){

1860

perror_plus("klogctl");

1861

}

1862

}

1863

#endif /* __linux__ */

1864

/* Lower privileges */

1865

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

} else {

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

2051

if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

1878

2056

}

1879

2057

}

1880

2058

1884

2062

1885

2063

ret = init_gnutls_global(pubkey, seckey);

1886

2064

if(ret == -1){

1887

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

2065

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

1888

2066

exitcode = EX_UNAVAILABLE;

1889

2067

goto end;

1890

2068

} else {

1906

2084

}

1907

2085

1908

2086

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

1909

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

2087

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

1910

2088

exitcode = EX_UNAVAILABLE;

1911

2089

goto end;

1912

2090

} else {

1921

2099

/* Connect directly, do not use Zeroconf */

1922

2100

/* (Mainly meant for debugging) */

1923

2101

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

2102

1924

2103

if(address == NULL){

1925

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

2104

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

1926

2105

exitcode = EX_USAGE;

1927

2106

goto end;

1928

2107

}

1936

2115

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

1937

2116

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

1938

2117

or tmpmax != (uint16_t)tmpmax){

1939

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

2118

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

1940

2119

exitcode = EX_USAGE;

1941

2120

goto end;

1942

2121

}

1972

2151

break;

1973

2152

}

1974

2153

if(debug){

1975

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

1976

(int)retry_interval);

2154

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

2155

(int)retry_interval);

1977

2156

}

1978

2157

sleep((int)retry_interval);

1979

2158

}

2009

2188

2010

2189

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

2011

2190

if(mc.server == NULL){

2012

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

2013

avahi_strerror(error));

2191

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

2192

avahi_strerror(error));

2014

2193

exitcode = EX_UNAVAILABLE;

2015

2194

goto end;

2016

2195

}

2024

2203

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2025

2204

NULL, 0, browse_callback, NULL);

2026

2205

if(sb == NULL){

2027

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

2028

avahi_strerror(avahi_server_errno(mc.server)));

2206

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

2207

avahi_strerror(avahi_server_errno(mc.server)));

2029

2208

exitcode = EX_UNAVAILABLE;

2030

2209

goto end;

2031

2210

}

2037

2216

/* Run the main loop */

2038

2217

2039

2218

if(debug){

2040

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

2219

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

2041

2220

}

2042

2221

2043

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

2223

(int)(retry_interval * 1000));

2045

2224

if(debug){

2046

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

2047

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

2225

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

2226

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

2048

2227

}

2049

2228

2050

2229

end:

2051

2230

2052

2231

if(debug){

2053

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

2232

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

2054

2233

}

2055

2234

2056

2235

/* Cleanup things */

2072

2251

if(gpgme_initialized){

2073

2252

gpgme_release(mc.ctx);

2074

2253

}

2075

2254

2076

2255

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

2077

2256

has seen */

2078

2257

if(mc.current_server != NULL){

2084

2263

}

2085

2264

}

2086

2265

2087

/* XXX run network hooks "stop" here */

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2088

2268

2089

/* Take down the network interface */

2090

if(take_down_interface){

2091

/* Re-raise priviliges */

2092

errno = 0;

2093

ret = seteuid(0);

2094

if(ret == -1){

2095

perror_plus("seteuid");

2096

}

2097

if(geteuid() == 0){

2269

/* Re-raise priviliges */

2270

{

2271

raise_privileges();

2272

2273

/* Take down the network interface */

2274

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

2098

2275

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

2099

2276

if(ret == -1){

2100

2277

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2278

} else if(network.ifr_flags & IFF_UP){

2102

2279

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

2103

2280

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

2104

2281

if(ret == -1){

2109

2286

if(ret == -1){

2110

2287

perror_plus("close");

2111

2288

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2117

}

2118

2289

}

2119

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2120

2297

2121

2298

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

2122

2299

if(tempdir_created){

2136

2313

}

2137

2314

ret = remove(fullname);

2138

2315

if(ret == -1){

2139

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

2140

strerror(errno));

2316

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

2317

strerror(errno));

2141

2318

}

2142

2319

free(fullname);

2143

2320

}