/mandos/trunk : revision 287

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() */

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38

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

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stdout, ferror() */

39

stdout, ferror(), sscanf(),

40

remove() */

40

41

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

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

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43

#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(), DIR */

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

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DIR */

52

54

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

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55

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

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

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

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

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*/

61

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

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62

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

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63

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

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64

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

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

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setgid() */

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

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

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

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74

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

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argp_state, struct argp,

73

76

argp_parse(), ARGP_KEY_ARG,

90

93

gnutls_*

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init_gnutls_session(),

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95

GNUTLS_* */

93

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

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#include <gnutls/openpgp.h>

97

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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100

/* GPGME */

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*/

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size_t adjustbuffer(char **buffer, size_t buffer_length,

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135

size_t buffer_capacity){

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if (buffer_length + BUFFER_SIZE > buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if (buffer == NULL){

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if(buffer == NULL){

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return 0;

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}

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buffer_capacity += BUFFER_SIZE;

156

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int fd;

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gpgme_data_t pgp_data;

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162

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

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

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if(fd == -1){

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perror("open");

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return false;

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}

164

168

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if (rc != GPG_ERR_NO_ERROR){

170

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);

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if (rc != GPG_ERR_NO_ERROR){

177

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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}

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ret = TEMP_FAILURE_RETRY(close(fd));

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

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if(ret == -1){

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perror("close");

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}

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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);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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if (rc != GPG_ERR_NO_ERROR){

198

if(rc != GPG_ERR_NO_ERROR){

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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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}

199

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200

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

201

rc = gpgme_get_engine_info (&engine_info);

202

if (rc != GPG_ERR_NO_ERROR){

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rc = gpgme_get_engine_info(&engine_info);

206

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));

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if (rc != GPG_ERR_NO_ERROR){

226

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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}

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

232

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

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return false;

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}

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236

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* Decrypt OpenPGP data.

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* Returns -1 on error

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*/

239

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

240

const char *cryptotext,

241

size_t crypto_size,

242

char **plaintext){

243

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

244

const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

246

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size_t plaintext_capacity = 0;

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ssize_t plaintext_length = 0;

248

252

249

if (debug){

253

if(debug){

250

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

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255

}

252

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253

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

254

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

255

259

0);

256

if (rc != GPG_ERR_NO_ERROR){

260

if(rc != GPG_ERR_NO_ERROR){

257

261

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

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262

gpgme_strsource(rc), gpgme_strerror(rc));

259

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return -1;

261

265

262

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

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rc = gpgme_data_new(&dh_plain);

264

if (rc != GPG_ERR_NO_ERROR){

268

if(rc != GPG_ERR_NO_ERROR){

265

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

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270

gpgme_strsource(rc), gpgme_strerror(rc));

267

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gpgme_data_release(dh_crypto);

271

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

272

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data buffer */

273

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

274

if (rc != GPG_ERR_NO_ERROR){

278

if(rc != GPG_ERR_NO_ERROR){

275

279

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

276

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gpgme_strsource(rc), gpgme_strerror(rc));

277

281

plaintext_length = -1;

278

if (debug){

282

if(debug){

279

283

gpgme_decrypt_result_t result;

280

284

result = gpgme_op_decrypt_result(mc->ctx);

281

if (result == NULL){

285

if(result == NULL){

282

286

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

283

287

} else {

284

288

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

311

315

}

312

316

313

317

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

314

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

318

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

315

319

perror("gpgme_data_seek");

316

320

plaintext_length = -1;

317

321

goto decrypt_end;

322

326

plaintext_capacity = adjustbuffer(plaintext,

323

327

(size_t)plaintext_length,

324

328

plaintext_capacity);

325

if (plaintext_capacity == 0){

329

if(plaintext_capacity == 0){

326

330

perror("adjustbuffer");

327

331

plaintext_length = -1;

328

332

goto decrypt_end;

331

335

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

332

336

BUFFER_SIZE);

333

337

/* Print the data, if any */

334

if (ret == 0){

338

if(ret == 0){

335

339

/* EOF */

336

340

break;

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341

}

361

365

return plaintext_length;

362

366

}

363

367

364

static const char * safer_gnutls_strerror (int value) {

365

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

366

if (ret == NULL)

368

static const char * safer_gnutls_strerror(int value) {

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

370

-Wunreachable-code */

371

if(ret == NULL)

367

372

ret = "(unknown)";

368

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return ret;

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374

}

384

389

}

385

390

386

391

ret = gnutls_global_init();

387

if (ret != GNUTLS_E_SUCCESS) {

388

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

389

safer_gnutls_strerror(ret));

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

390

395

return -1;

391

396

}

392

397

393

if (debug){

398

if(debug){

394

399

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

395

400

* - GnuTLS manual

396

401

*/

400

405

401

406

/* OpenPGP credentials */

402

407

gnutls_certificate_allocate_credentials(&mc->cred);

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 ();

408

if(ret != GNUTLS_E_SUCCESS){

409

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

410

* from

411

* -Wunreachable-code

412

*/

413

safer_gnutls_strerror(ret));

414

gnutls_global_deinit();

408

415

return -1;

409

416

}

410

417

424

ret = gnutls_certificate_set_openpgp_key_file

418

425

(mc->cred, pubkeyfilename, seckeyfilename,

419

426

GNUTLS_OPENPGP_FMT_BASE64);

420

if (ret != GNUTLS_E_SUCCESS) {

427

if(ret != GNUTLS_E_SUCCESS) {

421

428

fprintf(stderr,

422

429

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

423

430

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

428

435

429

436

/* GnuTLS server initialization */

430

437

ret = gnutls_dh_params_init(&mc->dh_params);

431

if (ret != GNUTLS_E_SUCCESS) {

432

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

433

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

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

434

441

goto globalfail;

435

442

}

436

443

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

437

if (ret != GNUTLS_E_SUCCESS) {

438

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

439

safer_gnutls_strerror(ret));

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

440

447

goto globalfail;

441

448

}

442

449

457

464

int ret;

458

465

/* GnuTLS session creation */

459

466

ret = gnutls_init(session, GNUTLS_SERVER);

460

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

461

468

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

462

469

safer_gnutls_strerror(ret));

463

470

}

465

472

{

466

473

const char *err;

467

474

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

468

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

469

476

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

470

477

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

471

478

safer_gnutls_strerror(ret));

472

gnutls_deinit (*session);

479

gnutls_deinit(*session);

473

480

return -1;

474

481

}

475

482

}

476

483

477

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

478

485

mc->cred);

479

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

480

487

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

481

488

safer_gnutls_strerror(ret));

482

gnutls_deinit (*session);

489

gnutls_deinit(*session);

483

490

return -1;

484

491

}

485

492

486

493

/* ignore client certificate if any. */

487

gnutls_certificate_server_set_request (*session,

488

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

489

496

490

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

491

498

492

499

return 0;

493

500

}

501

508

AvahiIfIndex if_index,

502

509

mandos_context *mc){

503

510

int ret, tcp_sd;

511

ssize_t sret;

504

512

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

505

513

char *buffer = NULL;

506

514

char *decrypted_buffer;

512

520

char interface[IF_NAMESIZE];

513

521

gnutls_session_t session;

514

522

515

ret = init_gnutls_session (mc, &session);

516

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

517

525

return -1;

518

526

}

519

527

541

549

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

542

550

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

543

551

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

544

if (ret < 0 ){

552

if(ret < 0 ){

545

553

perror("inet_pton");

546

554

return -1;

547

555

}

549

557

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

550

558

return -1;

551

559

}

552

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

560

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

561

-Wconversion and

562

-Wunreachable-code */

553

563

554

564

to.in6.sin6_scope_id = (uint32_t)if_index;

555

565

568

578

}

569

579

570

580

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

571

if (ret < 0){

581

if(ret < 0){

572

582

perror("connect");

573

583

return -1;

574

584

}

575

585

576

586

const char *out = mandos_protocol_version;

577

587

written = 0;

578

while (true){

588

while(true){

579

589

size_t out_size = strlen(out);

580

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

590

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

581

591

out_size - written));

582

if (ret == -1){

592

if(ret == -1){

583

593

perror("write");

584

594

retval = -1;

585

595

goto mandos_end;

588

598

if(written < out_size){

589

599

continue;

590

600

} else {

591

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

592

602

written = 0;

593

603

out = "\r\n";

594

604

} else {

601

611

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

602

612

}

603

613

604

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

605

615

606

616

do{

607

ret = gnutls_handshake (session);

617

ret = gnutls_handshake(session);

608

618

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

609

619

610

if (ret != GNUTLS_E_SUCCESS){

620

if(ret != GNUTLS_E_SUCCESS){

611

621

if(debug){

612

622

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

613

gnutls_perror (ret);

623

gnutls_perror(ret);

614

624

}

615

625

retval = -1;

616

626

goto mandos_end;

626

636

while(true){

627

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

628

638

buffer_capacity);

629

if (buffer_capacity == 0){

639

if(buffer_capacity == 0){

630

640

perror("adjustbuffer");

631

641

retval = -1;

632

642

goto mandos_end;

633

643

}

634

644

635

ret = gnutls_record_recv(session, buffer+buffer_length,

636

BUFFER_SIZE);

637

if (ret == 0){

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

638

648

break;

639

649

}

640

if (ret < 0){

641

switch(ret){

650

if(sret < 0){

651

switch(sret){

642

652

case GNUTLS_E_INTERRUPTED:

643

653

case GNUTLS_E_AGAIN:

644

654

break;

645

655

case GNUTLS_E_REHANDSHAKE:

646

656

do{

647

ret = gnutls_handshake (session);

657

ret = gnutls_handshake(session);

648

658

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

649

if (ret < 0){

659

if(ret < 0){

650

660

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

651

gnutls_perror (ret);

661

gnutls_perror(ret);

652

662

retval = -1;

653

663

goto mandos_end;

654

664

}

657

667

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

658

668

" encrypted session with Mandos server\n");

659

669

retval = -1;

660

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

661

671

goto mandos_end;

662

672

}

663

673

} else {

664

buffer_length += (size_t) ret;

674

buffer_length += (size_t) sret;

665

675

}

666

676

}

667

677

669

679

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

670

680

}

671

681

672

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

673

683

674

if (buffer_length > 0){

684

if(buffer_length > 0){

675

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

676

686

buffer_length,

677

687

&decrypted_buffer);

678

if (decrypted_buffer_size >= 0){

688

if(decrypted_buffer_size >= 0){

679

689

written = 0;

680

690

while(written < (size_t) decrypted_buffer_size){

681

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

682

(size_t)decrypted_buffer_size - written,

683

stdout);

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

684

694

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

685

695

if(debug){

686

696

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

703

713

704

714

mandos_end:

705

715

free(buffer);

706

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

716

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

707

717

if(ret == -1){

708

718

perror("close");

709

719

}

710

gnutls_deinit (session);

720

gnutls_deinit(session);

711

721

return retval;

712

722

}

713

723

731

741

/* Called whenever a service has been resolved successfully or

732

742

timed out */

733

743

734

switch (event) {

744

switch(event) {

735

745

default:

736

746

case AVAHI_RESOLVER_FAILURE:

737

747

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

745

755

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

746

756

if(debug){

747

757

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

748

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

749

interface, port);

758

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

759

ip, (intmax_t)interface, port);

750

760

}

751

761

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

752

if (ret == 0){

762

if(ret == 0){

753

763

avahi_simple_poll_quit(mc->simple_poll);

754

764

}

755

765

}

773

783

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

774

784

is removed from the LAN */

775

785

776

switch (event) {

786

switch(event) {

777

787

default:

778

788

case AVAHI_BROWSER_FAILURE:

779

789

788

798

the callback function is called the Avahi server will free the

789

799

resolver for us. */

790

800

791

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

801

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

792

802

protocol, name, type, domain,

793

803

AVAHI_PROTO_INET6, 0,

794

804

resolve_callback, mc)))

812

822

AvahiSServiceBrowser *sb = NULL;

813

823

int error;

814

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

815

827

int exitcode = EXIT_SUCCESS;

816

828

const char *interface = "eth0";

817

829

struct ifreq network;

827

839

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

828

840

.dh_bits = 1024, .priority = "SECURE256"

829

841

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

830

bool gnutls_initalized = false;

831

bool gpgme_initalized = false;

842

bool gnutls_initialized = false;

843

bool gpgme_initialized = false;

832

844

833

845

{

834

846

struct argp_option options[] = {

863

875

{ .name = NULL }

864

876

};

865

877

866

error_t parse_opt (int key, char *arg,

867

struct argp_state *state) {

868

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

869

a pointer to our plugin list pointer. */

870

switch (key) {

878

error_t parse_opt(int key, char *arg,

879

struct argp_state *state) {

880

switch(key) {

871

881

case 128: /* --debug */

872

882

debug = true;

873

883

break;

884

894

pubkey = arg;

885

895

break;

886

896

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

887

errno = 0;

888

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

889

if (errno){

890

perror("strtol");

897

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

898

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

899

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

900

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

891

901

exit(EXIT_FAILURE);

892

902

}

903

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

893

904

break;

894

905

case 130: /* --priority */

895

906

mc.priority = arg;

896

907

break;

897

908

case ARGP_KEY_ARG:

898

argp_usage (state);

909

argp_usage(state);

899

910

case ARGP_KEY_END:

900

911

break;

901

912

default:

908

919

.args_doc = "",

909

920

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

910

921

" passwords from a Mandos server" };

911

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

912

if (ret == ARGP_ERR_UNKNOWN){

922

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

923

if(ret == ARGP_ERR_UNKNOWN){

913

924

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

914

925

exitcode = EXIT_FAILURE;

915

926

goto end;

940

951

goto end;

941

952

}

942

953

}

943

ret = TEMP_FAILURE_RETRY(close(sd));

954

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

944

955

if(ret == -1){

945

956

perror("close");

946

957

}

950

961

gid = getgid();

951

962

952

963

ret = setuid(uid);

953

if (ret == -1){

964

if(ret == -1){

954

965

perror("setuid");

955

966

}

956

967

957

968

setgid(gid);

958

if (ret == -1){

969

if(ret == -1){

959

970

perror("setgid");

960

971

}

961

972

962

973

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

963

if (ret == -1){

974

if(ret == -1){

964

975

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

965

976

exitcode = EXIT_FAILURE;

966

977

goto end;

967

978

} else {

968

gnutls_initalized = true;

979

gnutls_initialized = true;

969

980

}

970

981

971

982

if(mkdtemp(tempdir) == NULL){

975

986

}

976

987

977

988

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

978

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

989

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

979

990

exitcode = EXIT_FAILURE;

980

991

goto end;

981

992

} else {

982

gpgme_initalized = true;

993

gpgme_initialized = true;

983

994

}

984

995

985

996

if_index = (AvahiIfIndex) if_nametoindex(interface);

997

1008

exitcode = EXIT_FAILURE;

998

1009

goto end;

999

1010

}

1000

errno = 0;

1001

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

1002

if(errno){

1003

perror("Bad port number");

1011

uint16_t port;

1012

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

1013

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

1014

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

1015

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

1004

1016

exitcode = EXIT_FAILURE;

1005

1017

goto end;

1006

1018

}

1019

port = (uint16_t)tmpmax;

1007

1020

*address = '\0';

1008

1021

address = connect_to;

1009

1022

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

1015

1028

goto end;

1016

1029

}

1017

1030

1018

if (not debug){

1031

if(not debug){

1019

1032

avahi_set_log_function(empty_log);

1020

1033

}

1021

1034

1024

1037

1025

1038

/* Allocate main Avahi loop object */

1026

1039

mc.simple_poll = avahi_simple_poll_new();

1027

if (mc.simple_poll == NULL) {

1040

if(mc.simple_poll == NULL) {

1028

1041

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

1029

1042

" object.\n");

1030

1043

exitcode = EXIT_FAILURE;

1050

1063

}

1051

1064

1052

1065

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

1053

if (mc.server == NULL) {

1066

if(mc.server == NULL) {

1054

1067

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

1055

1068

avahi_strerror(error));

1056

1069

exitcode = EXIT_FAILURE;

1062

1075

AVAHI_PROTO_INET6,

1063

1076

"_mandos._tcp", NULL, 0,

1064

1077

browse_callback, &mc);

1065

if (sb == NULL) {

1078

if(sb == NULL) {

1066

1079

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

1067

1080

avahi_strerror(avahi_server_errno(mc.server)));

1068

1081

exitcode = EXIT_FAILURE;

1071

1084

1072

1085

/* Run the main loop */

1073

1086

1074

if (debug){

1087

if(debug){

1075

1088

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

1076

1089

}

1077

1090

1079

1092

1080

1093

end:

1081

1094

1082

if (debug){

1095

if(debug){

1083

1096

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

1084

1097

}

1085

1098

1086

1099

/* Cleanup things */

1087

if (sb != NULL)

1100

if(sb != NULL)

1088

1101

avahi_s_service_browser_free(sb);

1089

1102

1090

if (mc.server != NULL)

1103

if(mc.server != NULL)

1091

1104

avahi_server_free(mc.server);

1092

1105

1093

if (mc.simple_poll != NULL)

1106

if(mc.simple_poll != NULL)

1094

1107

avahi_simple_poll_free(mc.simple_poll);

1095

1108

1096

if (gnutls_initalized){

1109

if(gnutls_initialized){

1097

1110

gnutls_certificate_free_credentials(mc.cred);

1098

gnutls_global_deinit ();

1111

gnutls_global_deinit();

1099

1112

gnutls_dh_params_deinit(mc.dh_params);

1100

1113

}

1101

1114

1102

if(gpgme_initalized){

1115

if(gpgme_initialized){

1103

1116

gpgme_release(mc.ctx);

1104

1117

}

1105

1118

1109

1122

struct dirent *direntry;

1110

1123

d = opendir(tempdir);

1111

1124

if(d == NULL){

1112

perror("opendir");

1125

if(errno != ENOENT){

1126

perror("opendir");

1127

}

1113

1128

} else {

1114

1129

while(true){

1115

1130

direntry = readdir(d);

1116

1131

if(direntry == NULL){

1117

1132

break;

1118

1133

}

1119

if (direntry->d_type == DT_REG){

1120

char *fullname = NULL;

1121

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

1122

direntry->d_name);

1123

if(ret < 0){

1124

perror("asprintf");

1125

continue;

1126

}

1127

ret = unlink(fullname);

1128

if(ret == -1){

1129

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

1130

fullname, strerror(errno));

1131

}

1132

free(fullname);

1133

}

1134

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

1135

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

1136

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

1137

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

1138

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

1139

continue;

1140

}

1141

char *fullname = NULL;

1142

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

1143

direntry->d_name);

1144

if(ret < 0){

1145

perror("asprintf");

1146

continue;

1147

}

1148

ret = remove(fullname);

1149

if(ret == -1){

1150

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

1151

strerror(errno));

1152

}

1153

free(fullname);

1134

1154

}

1135

1155

closedir(d);

1136

1156

}

1137

1157

ret = rmdir(tempdir);

1138

if(ret == -1){

1158

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

1139

1159

perror("rmdir");

1140

1160

}

1141

1161

}

1142

1162

1143

1163

return exitcode;

1144

1164

}