/mandos/trunk : revision 260

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos-client - get and decrypt data from a Mandos server

3

* Mandos client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

36

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

37

38

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

39

stdout, ferror(), sscanf(),

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remove() */

39

stdout, ferror() */

41

40

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

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41

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

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42

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

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(),

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DIR */

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uid_t, gid_t, open(), opendir(), DIR */

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52

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

55

53

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

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struct in6_addr, inet_pton(),

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connect() */

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56

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

61

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

57

#include <dirent.h> /* opendir(), struct dirent, readdir() */

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#include <inttypes.h> /* PRIu16 */

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59

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

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60

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

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#include <time.h> /* nanosleep(), time() */

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

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62

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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64

if_nametoindex(), IF_NAMESIZE */

70

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getuid(), getgid(), setuid(),

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68

setgid() */

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69

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

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

70

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

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71

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

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argp_state, struct argp,

76

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argp_parse(), ARGP_KEY_ARG,

77

74

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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

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75

80

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/* Avahi */

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/* All Avahi types, constants and functions

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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

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94

GNUTLS_OPENPGP_FMT_BASE64 */

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95

101

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/* GPGME */

134

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*/

135

130

size_t adjustbuffer(char **buffer, size_t buffer_length,

136

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size_t buffer_capacity){

137

if(buffer_length + BUFFER_SIZE > buffer_capacity){

132

if (buffer_length + BUFFER_SIZE > buffer_capacity){

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

139

if(buffer == NULL){

134

if (buffer == NULL){

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return 0;

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136

}

142

137

buffer_capacity += BUFFER_SIZE;

155

150

156

151

157

152

/*

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* Helper function to insert pub and seckey to the engine keyring.

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* Helper function to insert pub and seckey to the enigne keyring.

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*/

160

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bool import_key(const char *filename){

161

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int fd;

168

163

}

169

164

170

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

166

if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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rc = gpgme_op_import(mc->ctx, pgp_data);

178

if(rc != GPG_ERR_NO_ERROR){

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if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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return true;

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}

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if(debug){

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if (debug){

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fprintf(stderr, "Initialize gpgme\n");

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}

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/* Init GPGME */

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gpgme_check_version(NULL);

198

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

199

if(rc != GPG_ERR_NO_ERROR){

194

if (rc != GPG_ERR_NO_ERROR){

200

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

204

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

206

rc = gpgme_get_engine_info(&engine_info);

207

if(rc != GPG_ERR_NO_ERROR){

201

rc = gpgme_get_engine_info (&engine_info);

202

if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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/* Create new GPGME "context" */

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rc = gpgme_new(&(mc->ctx));

227

if(rc != GPG_ERR_NO_ERROR){

222

if (rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

232

227

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if(not import_key(pubkey) or not import_key(seckey)){

228

if (not import_key(pubkey) or not import_key(seckey)){

234

229

return false;

235

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}

236

231

241

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* Decrypt OpenPGP data.

242

237

* Returns -1 on error

243

238

*/

244

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

245

const char *cryptotext,

246

size_t crypto_size,

247

char **plaintext){

239

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

240

const char *cryptotext,

241

size_t crypto_size,

242

char **plaintext){

248

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gpgme_data_t dh_crypto, dh_plain;

249

244

gpgme_error_t rc;

250

245

ssize_t ret;

251

246

size_t plaintext_capacity = 0;

252

247

ssize_t plaintext_length = 0;

253

248

254

if(debug){

249

if (debug){

255

250

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

256

251

}

257

252

258

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

259

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

260

255

0);

261

if(rc != GPG_ERR_NO_ERROR){

256

if (rc != GPG_ERR_NO_ERROR){

262

257

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

263

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gpgme_strsource(rc), gpgme_strerror(rc));

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return -1;

266

261

267

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

268

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rc = gpgme_data_new(&dh_plain);

269

if(rc != GPG_ERR_NO_ERROR){

264

if (rc != GPG_ERR_NO_ERROR){

270

265

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

271

266

gpgme_strsource(rc), gpgme_strerror(rc));

272

267

gpgme_data_release(dh_crypto);

276

271

/* Decrypt data from the cryptotext data buffer to the plaintext

277

272

data buffer */

278

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rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

279

if(rc != GPG_ERR_NO_ERROR){

274

if (rc != GPG_ERR_NO_ERROR){

280

275

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

281

276

gpgme_strsource(rc), gpgme_strerror(rc));

282

277

plaintext_length = -1;

283

if(debug){

278

if (debug){

284

279

gpgme_decrypt_result_t result;

285

280

result = gpgme_op_decrypt_result(mc->ctx);

286

if(result == NULL){

281

if (result == NULL){

287

282

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

288

283

} else {

289

284

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

316

311

}

317

312

318

313

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

319

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

314

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

320

315

perror("gpgme_data_seek");

321

316

plaintext_length = -1;

322

317

goto decrypt_end;

327

322

plaintext_capacity = adjustbuffer(plaintext,

328

323

(size_t)plaintext_length,

329

324

plaintext_capacity);

330

if(plaintext_capacity == 0){

325

if (plaintext_capacity == 0){

331

326

perror("adjustbuffer");

332

327

plaintext_length = -1;

333

328

goto decrypt_end;

336

331

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

337

332

BUFFER_SIZE);

338

333

/* Print the data, if any */

339

if(ret == 0){

334

if (ret == 0){

340

335

/* EOF */

341

336

break;

342

337

}

366

361

return plaintext_length;

367

362

}

368

363

369

static const char * safer_gnutls_strerror(int value) {

370

const char *ret = gnutls_strerror(value); /* Spurious warning from

371

-Wunreachable-code */

372

if(ret == NULL)

364

static const char * safer_gnutls_strerror (int value) {

365

const char *ret = gnutls_strerror (value); /* Spurious warning */

366

if (ret == NULL)

373

367

ret = "(unknown)";

374

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return ret;

375

369

}

390

384

}

391

385

392

386

ret = gnutls_global_init();

393

if(ret != GNUTLS_E_SUCCESS) {

394

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

395

safer_gnutls_strerror(ret));

387

if (ret != GNUTLS_E_SUCCESS) {

388

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

389

safer_gnutls_strerror(ret));

396

390

return -1;

397

391

}

398

392

399

if(debug){

393

if (debug){

400

394

/* "Use a log level over 10 to enable all debugging options."

401

395

* - GnuTLS manual

402

396

*/

406

400

407

401

/* OpenPGP credentials */

408

402

gnutls_certificate_allocate_credentials(&mc->cred);

409

if(ret != GNUTLS_E_SUCCESS){

410

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

411

* from

412

* -Wunreachable-code

413

*/

414

safer_gnutls_strerror(ret));

415

gnutls_global_deinit();

403

if (ret != GNUTLS_E_SUCCESS){

404

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

405

warning */

406

safer_gnutls_strerror(ret));

407

gnutls_global_deinit ();

416

408

return -1;

417

409

}

418

410

425

417

ret = gnutls_certificate_set_openpgp_key_file

426

418

(mc->cred, pubkeyfilename, seckeyfilename,

427

419

GNUTLS_OPENPGP_FMT_BASE64);

428

if(ret != GNUTLS_E_SUCCESS) {

420

if (ret != GNUTLS_E_SUCCESS) {

429

421

fprintf(stderr,

430

422

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

431

423

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

436

428

437

429

/* GnuTLS server initialization */

438

430

ret = gnutls_dh_params_init(&mc->dh_params);

439

if(ret != GNUTLS_E_SUCCESS) {

440

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

441

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

431

if (ret != GNUTLS_E_SUCCESS) {

432

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

433

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

442

434

goto globalfail;

443

435

}

444

436

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

445

if(ret != GNUTLS_E_SUCCESS) {

446

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

447

safer_gnutls_strerror(ret));

437

if (ret != GNUTLS_E_SUCCESS) {

438

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

439

safer_gnutls_strerror(ret));

448

440

goto globalfail;

449

441

}

450

442

465

457

int ret;

466

458

/* GnuTLS session creation */

467

459

ret = gnutls_init(session, GNUTLS_SERVER);

468

if(ret != GNUTLS_E_SUCCESS){

460

if (ret != GNUTLS_E_SUCCESS){

469

461

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

470

462

safer_gnutls_strerror(ret));

471

463

}

473

465

{

474

466

const char *err;

475

467

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

476

if(ret != GNUTLS_E_SUCCESS) {

468

if (ret != GNUTLS_E_SUCCESS) {

477

469

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

478

470

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

479

471

safer_gnutls_strerror(ret));

480

gnutls_deinit(*session);

472

gnutls_deinit (*session);

481

473

return -1;

482

474

}

483

475

}

484

476

485

477

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

486

478

mc->cred);

487

if(ret != GNUTLS_E_SUCCESS) {

479

if (ret != GNUTLS_E_SUCCESS) {

488

480

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

489

481

safer_gnutls_strerror(ret));

490

gnutls_deinit(*session);

482

gnutls_deinit (*session);

491

483

return -1;

492

484

}

493

485

494

486

/* ignore client certificate if any. */

495

gnutls_certificate_server_set_request(*session,

496

GNUTLS_CERT_IGNORE);

487

gnutls_certificate_server_set_request (*session,

488

GNUTLS_CERT_IGNORE);

497

489

498

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

490

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

499

491

500

492

return 0;

501

493

}

521

513

char interface[IF_NAMESIZE];

522

514

gnutls_session_t session;

523

515

524

ret = init_gnutls_session(mc, &session);

525

if(ret != 0){

516

ret = init_gnutls_session (mc, &session);

517

if (ret != 0){

526

518

return -1;

527

519

}

528

520

550

542

/* It would be nice to have a way to detect if we were passed an

551

543

IPv4 address here. Now we assume an IPv6 address. */

552

544

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

553

if(ret < 0 ){

545

if (ret < 0 ){

554

546

perror("inet_pton");

555

547

return -1;

556

548

}

558

550

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

559

551

return -1;

560

552

}

561

to.in6.sin6_port = htons(port); /* Spurious warnings from

562

-Wconversion and

563

-Wunreachable-code */

553

to.in6.sin6_port = htons(port); /* Spurious warning */

564

554

565

555

to.in6.sin6_scope_id = (uint32_t)if_index;

566

556

579

569

}

580

570

581

571

ret = connect(tcp_sd, &to.in, sizeof(to));

582

if(ret < 0){

572

if (ret < 0){

583

573

perror("connect");

584

574

return -1;

585

575

}

586

576

587

577

const char *out = mandos_protocol_version;

588

578

written = 0;

589

while(true){

579

while (true){

590

580

size_t out_size = strlen(out);

591

581

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

592

582

out_size - written));

593

if(ret == -1){

583

if (ret == -1){

594

584

perror("write");

595

585

retval = -1;

596

586

goto mandos_end;

599

589

if(written < out_size){

600

590

continue;

601

591

} else {

602

if(out == mandos_protocol_version){

592

if (out == mandos_protocol_version){

603

593

written = 0;

604

594

out = "\r\n";

605

595

} else {

612

602

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

613

603

}

614

604

615

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

605

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

616

606

617

607

do{

618

ret = gnutls_handshake(session);

608

ret = gnutls_handshake (session);

619

609

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

620

610

621

if(ret != GNUTLS_E_SUCCESS){

611

if (ret != GNUTLS_E_SUCCESS){

622

612

if(debug){

623

613

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

624

gnutls_perror(ret);

614

gnutls_perror (ret);

625

615

}

626

616

retval = -1;

627

617

goto mandos_end;

637

627

while(true){

638

628

buffer_capacity = adjustbuffer(&buffer, buffer_length,

639

629

buffer_capacity);

640

if(buffer_capacity == 0){

630

if (buffer_capacity == 0){

641

631

perror("adjustbuffer");

642

632

retval = -1;

643

633

goto mandos_end;

645

635

646

636

sret = gnutls_record_recv(session, buffer+buffer_length,

647

637

BUFFER_SIZE);

648

if(sret == 0){

638

if (sret == 0){

649

639

break;

650

640

}

651

if(sret < 0){

641

if (sret < 0){

652

642

switch(sret){

653

643

case GNUTLS_E_INTERRUPTED:

654

644

case GNUTLS_E_AGAIN:

655

645

break;

656

646

case GNUTLS_E_REHANDSHAKE:

657

647

do{

658

ret = gnutls_handshake(session);

648

ret = gnutls_handshake (session);

659

649

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

660

if(ret < 0){

650

if (ret < 0){

661

651

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

662

gnutls_perror(ret);

652

gnutls_perror (ret);

663

653

retval = -1;

664

654

goto mandos_end;

665

655

}

668

658

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

669

659

" encrypted session with Mandos server\n");

670

660

retval = -1;

671

gnutls_bye(session, GNUTLS_SHUT_RDWR);

661

gnutls_bye (session, GNUTLS_SHUT_RDWR);

672

662

goto mandos_end;

673

663

}

674

664

} else {

680

670

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

681

671

}

682

672

683

gnutls_bye(session, GNUTLS_SHUT_RDWR);

673

gnutls_bye (session, GNUTLS_SHUT_RDWR);

684

674

685

if(buffer_length > 0){

675

if (buffer_length > 0){

686

676

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

687

677

buffer_length,

688

678

&decrypted_buffer);

689

if(decrypted_buffer_size >= 0){

679

if (decrypted_buffer_size >= 0){

690

680

written = 0;

691

681

while(written < (size_t) decrypted_buffer_size){

692

ret = (int)fwrite(decrypted_buffer + written, 1,

693

(size_t)decrypted_buffer_size - written,

694

stdout);

682

ret = (int)fwrite (decrypted_buffer + written, 1,

683

(size_t)decrypted_buffer_size - written,

684

stdout);

695

685

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

696

686

if(debug){

697

687

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

718

708

if(ret == -1){

719

709

perror("close");

720

710

}

721

gnutls_deinit(session);

711

gnutls_deinit (session);

722

712

return retval;

723

713

}

724

714

742

732

/* Called whenever a service has been resolved successfully or

743

733

timed out */

744

734

745

switch(event) {

735

switch (event) {

746

736

default:

747

737

case AVAHI_RESOLVER_FAILURE:

748

738

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

756

746

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

757

747

if(debug){

758

748

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

759

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

760

ip, (intmax_t)interface, port);

749

PRIu16 ") on port %d\n", name, host_name, ip,

750

interface, port);

761

751

}

762

752

int ret = start_mandos_communication(ip, port, interface, mc);

763

if(ret == 0){

753

if (ret == 0){

764

754

avahi_simple_poll_quit(mc->simple_poll);

765

755

}

766

756

}

784

774

/* Called whenever a new services becomes available on the LAN or

785

775

is removed from the LAN */

786

776

787

switch(event) {

777

switch (event) {

788

778

default:

789

779

case AVAHI_BROWSER_FAILURE:

790

780

799

789

the callback function is called the Avahi server will free the

800

790

resolver for us. */

801

791

802

if(!(avahi_s_service_resolver_new(mc->server, interface,

792

if (!(avahi_s_service_resolver_new(mc->server, interface,

803

793

protocol, name, type, domain,

804

794

AVAHI_PROTO_INET6, 0,

805

795

resolve_callback, mc)))

823

813

AvahiSServiceBrowser *sb = NULL;

824

814

int error;

825

815

int ret;

826

intmax_t tmpmax;

827

int numchars;

828

816

int exitcode = EXIT_SUCCESS;

829

817

const char *interface = "eth0";

830

818

struct ifreq network;

833

821

gid_t gid;

834

822

char *connect_to = NULL;

835

823

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

836

bool tempdir_created = false;

837

824

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

838

825

const char *seckey = PATHDIR "/" SECKEY;

839

826

const char *pubkey = PATHDIR "/" PUBKEY;

841

828

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

842

829

.dh_bits = 1024, .priority = "SECURE256"

843

830

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

844

bool gnutls_initialized = false;

845

bool gpgme_initialized = false;

846

double delay = 2.5;

831

bool gnutls_initalized = false;

832

bool gpgme_initalized = false;

847

833

848

834

{

849

835

struct argp_option options[] = {

875

861

.arg = "STRING",

876

862

.doc = "GnuTLS priority string for the TLS handshake",

877

863

.group = 1 },

878

{ .name = "delay", .key = 131,

879

.arg = "SECONDS",

880

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

881

.group = 2 },

882

864

{ .name = NULL }

883

865

};

884

866

885

error_t parse_opt(int key, char *arg,

886

struct argp_state *state) {

887

switch(key) {

867

error_t parse_opt (int key, char *arg,

868

struct argp_state *state) {

869

/* Get the INPUT argument from `argp_parse', which we know is

870

a pointer to our plugin list pointer. */

871

switch (key) {

888

872

case 128: /* --debug */

889

873

debug = true;

890

874

break;

901

885

pubkey = arg;

902

886

break;

903

887

case 129: /* --dh-bits */

904

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

905

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

906

or arg[numchars] != '\0'){

907

fprintf(stderr, "Bad number of DH bits\n");

888

errno = 0;

889

mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);

890

if (errno){

891

perror("strtol");

908

892

exit(EXIT_FAILURE);

909

893

}

910

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

911

894

break;

912

895

case 130: /* --priority */

913

896

mc.priority = arg;

914

897

break;

915

case 131: /* --delay */

916

ret = sscanf(arg, "%lf%n", &delay, &numchars);

917

if(ret < 1 or arg[numchars] != '\0'){

918

fprintf(stderr, "Bad delay\n");

919

exit(EXIT_FAILURE);

920

}

921

break;

922

898

case ARGP_KEY_ARG:

923

argp_usage(state);

899

argp_usage (state);

924

900

case ARGP_KEY_END:

925

901

break;

926

902

default:

933

909

.args_doc = "",

934

910

.doc = "Mandos client -- Get and decrypt"

935

911

" passwords from a Mandos server" };

936

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

937

if(ret == ARGP_ERR_UNKNOWN){

912

ret = argp_parse (&argp, argc, argv, 0, 0, NULL);

913

if (ret == ARGP_ERR_UNKNOWN){

938

914

fprintf(stderr, "Unknown error while parsing arguments\n");

939

915

exitcode = EXIT_FAILURE;

940

916

goto end;

943

919

944

920

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

945

921

{

946

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

947

messages to mess up the prompt */

948

ret = klogctl(8, NULL, 5);

949

if(ret == -1){

950

perror("klogctl");

951

}

952

953

922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

954

923

if(sd < 0) {

955

924

perror("socket");

956

925

exitcode = EXIT_FAILURE;

957

ret = klogctl(7, NULL, 0);

958

if(ret == -1){

959

perror("klogctl");

960

}

961

926

goto end;

962

927

}

963

928

strcpy(network.ifr_name, interface);

964

929

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

965

930

if(ret == -1){

966

931

perror("ioctl SIOCGIFFLAGS");

967

ret = klogctl(7, NULL, 0);

968

if(ret == -1){

969

perror("klogctl");

970

}

971

932

exitcode = EXIT_FAILURE;

972

933

goto end;

973

934

}

977

938

if(ret == -1){

978

939

perror("ioctl SIOCSIFFLAGS");

979

940

exitcode = EXIT_FAILURE;

980

ret = klogctl(7, NULL, 0);

981

if(ret == -1){

982

perror("klogctl");

983

}

984

941

goto end;

985

942

}

986

943

}

987

/* sleep checking until interface is running */

988

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

989

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

990

if(ret == -1){

991

perror("ioctl SIOCGIFFLAGS");

992

} else if(network.ifr_flags & IFF_RUNNING){

993

break;

994

}

995

struct timespec sleeptime = { .tv_nsec = 250000000 };

996

nanosleep(&sleeptime, NULL);

997

}

998

944

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

999

945

if(ret == -1){

1000

946

perror("close");

1001

947

}

1002

/* Restores kernel loglevel to default */

1003

ret = klogctl(7, NULL, 0);

1004

if(ret == -1){

1005

perror("klogctl");

1006

}

1007

948

}

1008

949

1009

950

uid = getuid();

1010

951

gid = getgid();

1011

952

953

ret = setuid(uid);

954

if (ret == -1){

955

perror("setuid");

956

}

957

1012

958

setgid(gid);

1013

if(ret == -1){

959

if (ret == -1){

1014

960

perror("setgid");

1015

961

}

1016

962

1017

ret = setuid(uid);

1018

if(ret == -1){

1019

perror("setuid");

1020

}

1021

1022

963

ret = init_gnutls_global(&mc, pubkey, seckey);

1023

if(ret == -1){

964

if (ret == -1){

1024

965

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

1025

966

exitcode = EXIT_FAILURE;

1026

967

goto end;

1027

968

} else {

1028

gnutls_initialized = true;

969

gnutls_initalized = true;

1029

970

}

1030

971

1031

972

if(mkdtemp(tempdir) == NULL){

1032

973

perror("mkdtemp");

974

tempdir[0] = '\0';

1033

975

goto end;

1034

976

}

1035

tempdir_created = true;

1036

977

1037

978

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

1038

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

979

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

1039

980

exitcode = EXIT_FAILURE;

1040

981

goto end;

1041

982

} else {

1042

gpgme_initialized = true;

983

gpgme_initalized = true;

1043

984

}

1044

985

1045

986

if_index = (AvahiIfIndex) if_nametoindex(interface);

1046

987

if(if_index == 0){

1047

988

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

1048

exitcode = EXIT_FAILURE;

1049

goto end;

989

exit(EXIT_FAILURE);

1050

990

}

1051

991

1052

992

if(connect_to != NULL){

1058

998

exitcode = EXIT_FAILURE;

1059

999

goto end;

1060

1000

}

1061

uint16_t port;

1062

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1063

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1064

or address[numchars+1] != '\0'){

1065

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

1001

errno = 0;

1002

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

1003

if(errno){

1004

perror("Bad port number");

1066

1005

exitcode = EXIT_FAILURE;

1067

1006

goto end;

1068

1007

}

1069

port = (uint16_t)tmpmax;

1070

1008

*address = '\0';

1071

1009

address = connect_to;

1072

1010

ret = start_mandos_communication(address, port, if_index, &mc);

1078

1016

goto end;

1079

1017

}

1080

1018

1081

if(not debug){

1019

if (not debug){

1082

1020

avahi_set_log_function(empty_log);

1083

1021

}

1084

1022

1087

1025

1088

1026

/* Allocate main Avahi loop object */

1089

1027

mc.simple_poll = avahi_simple_poll_new();

1090

if(mc.simple_poll == NULL) {

1028

if (mc.simple_poll == NULL) {

1091

1029

fprintf(stderr, "Avahi: Failed to create simple poll"

1092

1030

" object.\n");

1093

1031

exitcode = EXIT_FAILURE;

1113

1051

}

1114

1052

1115

1053

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

1116

if(mc.server == NULL) {

1054

if (mc.server == NULL) {

1117

1055

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

1118

1056

avahi_strerror(error));

1119

1057

exitcode = EXIT_FAILURE;

1125

1063

AVAHI_PROTO_INET6,

1126

1064

"_mandos._tcp", NULL, 0,

1127

1065

browse_callback, &mc);

1128

if(sb == NULL) {

1066

if (sb == NULL) {

1129

1067

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

1130

1068

avahi_strerror(avahi_server_errno(mc.server)));

1131

1069

exitcode = EXIT_FAILURE;

1134

1072

1135

1073

/* Run the main loop */

1136

1074

1137

if(debug){

1075

if (debug){

1138

1076

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

1139

1077

}

1140

1078

1141

1079

avahi_simple_poll_loop(mc.simple_poll);

1142

1080

1143

1081

end:

1144

1082

1145

if(debug){

1083

if (debug){

1146

1084

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

1147

1085

}

1148

1086

1149

1087

/* Cleanup things */

1150

if(sb != NULL)

1088

if (sb != NULL)

1151

1089

avahi_s_service_browser_free(sb);

1152

1090

1153

if(mc.server != NULL)

1091

if (mc.server != NULL)

1154

1092

avahi_server_free(mc.server);

1155

1093

1156

if(mc.simple_poll != NULL)

1094

if (mc.simple_poll != NULL)

1157

1095

avahi_simple_poll_free(mc.simple_poll);

1158

1096

1159

if(gnutls_initialized){

1097

if (gnutls_initalized){

1160

1098

gnutls_certificate_free_credentials(mc.cred);

1161

gnutls_global_deinit();

1099

gnutls_global_deinit ();

1162

1100

gnutls_dh_params_deinit(mc.dh_params);

1163

1101

}

1164

1102

1165

if(gpgme_initialized){

1103

if(gpgme_initalized){

1166

1104

gpgme_release(mc.ctx);

1167

1105

}

1168

1106

1169

1107

/* Removes the temp directory used by GPGME */

1170

if(tempdir_created){

1108

if(tempdir[0] != '\0'){

1171

1109

DIR *d;

1172

1110

struct dirent *direntry;

1173

1111

d = opendir(tempdir);

1174

1112

if(d == NULL){

1175

if(errno != ENOENT){

1176

perror("opendir");

1177

}

1113

perror("opendir");

1178

1114

} else {

1179

1115

while(true){

1180

1116

direntry = readdir(d);

1181

1117

if(direntry == NULL){

1182

1118

break;

1183

1119

}

1184

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

1185

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

1186

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

1187

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

1188

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

1189

continue;

1190

}

1191

char *fullname = NULL;

1192

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

1193

direntry->d_name);

1194

if(ret < 0){

1195

perror("asprintf");

1196

continue;

1197

}

1198

ret = remove(fullname);

1199

if(ret == -1){

1200

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

1201

strerror(errno));

1202

}

1203

free(fullname);

1120

if (direntry->d_type == DT_REG){

1121

char *fullname = NULL;

1122

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

1123

direntry->d_name);

1124

if(ret < 0){

1125

perror("asprintf");

1126

continue;

1127

}

1128

ret = unlink(fullname);

1129

if(ret == -1){

1130

fprintf(stderr, "unlink(\"%s\"): %s",

1131

fullname, strerror(errno));

1132

}

1133

free(fullname);

1134

}

1204

1135

}

1205

1136

closedir(d);

1206

1137

}

1207

1138

ret = rmdir(tempdir);

1208

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

1139

if(ret == -1){

1209

1140

perror("rmdir");

1210

1141

}

1211

1142

}

1212

1143

1213

1144

return exitcode;

1214

1145

}