/mandos/release : revision 237.16.10

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

107

110

init_gnutls_session(),

108

111

GNUTLS_* */

109

112

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

112

115

113

116

/* GPGME */

114

117

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

132

137

133

/* Doubly linked list that need to be circular linked when ever used */

138

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

134

139

typedef struct server{

135

140

const char *ip;

136

141

uint16_t port;

156

161

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

157

162

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

158

163

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

164

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

165

.current_server = NULL };

160

166

161

167

sig_atomic_t quit_now = 0;

162

168

int signal_received = 0;

163

169

164

170

/* Function to use when printing errors */

165

171

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

172

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

173

program_invocation_short_name);

167

174

perror(print_text);

168

175

}

169

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

170

186

/*

171

187

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

172

188

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

173

189

* "buffer_length" is how much is already used.

174

190

*/

175

191

size_t incbuffer(char **buffer, size_t buffer_length,

176

size_t buffer_capacity){

192

size_t buffer_capacity){

177

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

178

194

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

179

195

if(buffer == NULL){

184

200

return buffer_capacity;

185

201

}

186

202

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

203

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

204

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

205

int af){

190

206

int ret;

191

207

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

192

208

if(new_server == NULL){

194

210

return -1;

195

211

}

196

212

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

213

.port = port,

214

.if_index = if_index,

215

.af = af };

200

216

if(new_server->ip == NULL){

201

217

perror_plus("strdup");

202

return -1;

218

return -1;

203

219

}

204

/* uniqe case of first server */

220

/* Special case of first server */

205

221

if (mc.current_server == NULL){

206

222

new_server->next = new_server;

207

223

new_server->prev = new_server;

208

224

mc.current_server = new_server;

209

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

225

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

210

226

} else {

211

227

new_server->next = mc.current_server;

212

228

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

224

240

/*

225

241

* Initialize GPGME.

226

242

*/

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

229

245

gpgme_error_t rc;

230

246

gpgme_engine_info_t engine_info;

231

247

246

262

247

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

248

264

if(rc != GPG_ERR_NO_ERROR){

249

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

250

gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

251

267

return false;

252

268

}

253

269

254

270

rc = gpgme_op_import(mc.ctx, pgp_data);

255

271

if(rc != GPG_ERR_NO_ERROR){

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

258

274

return false;

259

275

}

260

276

267

283

}

268

284

269

285

if(debug){

270

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

286

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

271

287

}

272

288

273

289

/* Init GPGME */

274

290

gpgme_check_version(NULL);

275

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

276

292

if(rc != GPG_ERR_NO_ERROR){

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

279

295

return false;

280

296

}

281

297

282

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

298

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

283

299

rc = gpgme_get_engine_info(&engine_info);

284

300

if(rc != GPG_ERR_NO_ERROR){

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

287

303

return false;

288

304

}

289

305

while(engine_info != NULL){

295

311

engine_info = engine_info->next;

296

312

}

297

313

if(engine_info == NULL){

298

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

314

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

315

tempdir);

299

316

return false;

300

317

}

301

318

302

319

/* Create new GPGME "context" */

303

320

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

304

321

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

307

325

return false;

308

326

}

309

327

328

346

ssize_t plaintext_length = 0;

329

347

330

348

if(debug){

331

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

349

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

332

350

}

333

351

334

352

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

335

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

354

0);

337

355

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

340

358

return -1;

341

359

}

342

360

343

361

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

344

362

rc = gpgme_data_new(&dh_plain);

345

363

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

348

367

gpgme_data_release(dh_crypto);

349

368

return -1;

350

369

}

353

372

data buffer */

354

373

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

355

374

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

358

377

plaintext_length = -1;

359

378

if(debug){

360

379

gpgme_decrypt_result_t result;

361

380

result = gpgme_op_decrypt_result(mc.ctx);

362

381

if(result == NULL){

363

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

382

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

364

383

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

369

388

if(result->file_name != NULL){

370

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

389

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

371

390

}

372

391

gpgme_recipient_t recipient;

373

392

recipient = result->recipients;

374

393

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

381

401

recipient = recipient->next;

382

402

}

383

403

}

386

406

}

387

407

388

408

if(debug){

389

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

409

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

390

410

}

391

411

392

412

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

399

419

*plaintext = NULL;

400

420

while(true){

401

421

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

404

424

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

408

428

}

409

429

410

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

443

}

424

444

425

445

if(debug){

426

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

446

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

427

447

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

428

448

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

429

449

}

451

471

/* GnuTLS log function callback */

452

472

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

453

473

const char* string){

454

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

474

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

455

475

}

456

476

457

477

static int init_gnutls_global(const char *pubkeyfilename,

459

479

int ret;

460

480

461

481

if(debug){

462

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

482

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

463

483

}

464

484

465

485

ret = gnutls_global_init();

466

486

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

469

489

return -1;

470

490

}

471

491

478

498

}

479

499

480

500

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

482

502

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

488

505

gnutls_global_deinit();

489

506

return -1;

490

507

}

491

508

492

509

if(debug){

493

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

494

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

495

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

496

514

}

497

515

498

516

ret = gnutls_certificate_set_openpgp_key_file

499

517

(mc.cred, pubkeyfilename, seckeyfilename,

500

518

GNUTLS_OPENPGP_FMT_BASE64);

501

519

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

507

525

goto globalfail;

508

526

}

509

527

510

528

/* GnuTLS server initialization */

511

529

ret = gnutls_dh_params_init(&mc.dh_params);

512

530

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

515

534

goto globalfail;

516

535

}

517

536

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

518

537

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

521

540

goto globalfail;

522

541

}

523

542

543

562

}

544

563

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

545

564

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

548

568

}

549

569

550

570

{

557

577

}

558

578

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

559

579

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

580

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

581

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

582

safer_gnutls_strerror(ret));

563

583

gnutls_deinit(*session);

564

584

return -1;

565

585

}

574

594

}

575

595

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

576

596

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

579

599

gnutls_deinit(*session);

580

600

return -1;

581

601

}

626

646

pf = PF_INET;

627

647

break;

628

648

default:

629

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

649

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

630

650

errno = EINVAL;

631

651

return -1;

632

652

}

637

657

}

638

658

639

659

if(debug){

640

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

641

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

642

662

}

643

663

644

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

690

}

671

691

if(ret == 0){

672

692

int e = errno;

673

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

693

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

674

694

errno = e;

675

695

goto mandos_end;

676

696

}

681

701

682

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

703

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

684

-Wunreachable-code*/

704

-Wunreachable-code*/

685

705

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

688

708

errno = EINVAL;

689

709

goto mandos_end;

690

710

}

708

728

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

709

729

perror_plus("if_indextoname");

710

730

} else {

711

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

712

ip, interface, port);

731

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

732

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

713

733

}

714

734

} else {

715

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

716

port);

735

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

736

ip, port);

717

737

}

718

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

749

perror_plus("inet_ntop");

730

750

} else {

731

751

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

732

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

752

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

733

753

}

734

754

}

735

755

}

763

783

while(true){

764

784

size_t out_size = strlen(out);

765

785

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

766

out_size - written));

786

out_size - written));

767

787

if(ret == -1){

768

788

int e = errno;

769

789

perror_plus("write");

789

809

}

790

810

791

811

if(debug){

792

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

812

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

793

813

}

794

814

795

815

if(quit_now){

796

816

errno = EINTR;

797

817

goto mandos_end;

798

818

}

799

800

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

819

820

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

801

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

822

803

823

if(quit_now){

815

835

816

836

if(ret != GNUTLS_E_SUCCESS){

817

837

if(debug){

818

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

838

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

819

839

gnutls_perror(ret);

820

840

}

821

841

errno = EPROTO;

825

845

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

826

846

827

847

if(debug){

828

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

829

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

830

850

}

831

851

832

852

while(true){

837

857

}

838

858

839

859

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

860

buffer_capacity);

841

861

if(buffer_capacity == 0){

842

862

int e = errno;

843

863

perror_plus("incbuffer");

870

890

}

871

891

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

872

892

if(ret < 0){

873

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

893

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

894

"***\n");

874

895

gnutls_perror(ret);

875

896

errno = EPROTO;

876

897

goto mandos_end;

877

898

}

878

899

break;

879

900

default:

880

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

881

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

882

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

904

errno = EIO;

884

905

goto mandos_end;

889

910

}

890

911

891

912

if(debug){

892

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

913

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

893

914

}

894

915

895

916

if(quit_now){

907

928

908

929

if(buffer_length > 0){

909

930

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

932

&decrypted_buffer);

913

933

if(decrypted_buffer_size >= 0){

914

934

925

945

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

926

946

int e = errno;

927

947

if(debug){

928

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

929

strerror(errno));

948

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

949

strerror(errno));

930

950

}

931

951

errno = e;

932

952

goto mandos_end;

989

1009

switch(event){

990

1010

default:

991

1011

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

995

1016

break;

996

1017

997

1018

case AVAHI_RESOLVER_FOUND:

999

1020

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1021

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

1001

1022

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1023

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

1024

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

1025

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

1005

1026

}

1006

1027

int ret = start_mandos_communication(ip, port, interface,

1007

1028

avahi_proto_to_af(proto));

1039

1060

default:

1040

1061

case AVAHI_BROWSER_FAILURE:

1041

1062

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1044

1065

avahi_simple_poll_quit(mc.simple_poll);

1045

1066

return;

1046

1067

1053

1074

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

1054

1075

name, type, domain, protocol, 0,

1055

1076

resolve_callback, NULL) == NULL)

1056

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

1057

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

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1058

1080

break;

1059

1081

1060

1082

case AVAHI_BROWSER_REMOVE:

1063

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1087

if(debug){

1066

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

1088

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

1089

" searching...\n");

1067

1090

}

1068

1091

break;

1069

1092

}

1070

1093

}

1071

1094

1072

/* Signal handler that stops main loop after sigterm has been called */

1095

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

1073

1096

static void handle_sigterm(int sig){

1074

1097

if(quit_now){

1075

1098

return;

1084

1107

errno = old_errno;

1085

1108

}

1086

1109

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1143

1121

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1122

perror_plus("ioctl SIOCGIFFLAGS");

1146

1123

}

1147

free(flagstring);

1148

return 0;

1124

return false;

1149

1125

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1126

return true;

1127

}

1128

1129

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

1130

1152

1131

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1133

if(debug){

1155

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

1156

if_entry->d_name);

1134

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

1135

ifname);

1157

1136

}

1158

return 0;

1137

return false;

1159

1138

}

1160

1139

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

1161

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

1140

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

1162

1141

if(debug){

1163

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

1164

if_entry->d_name);

1142

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

1143

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

1165

1144

}

1166

return 1;

1145

return true;

1167

1146

}

1168

1147

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

1169

if(not (flags & IFF_BROADCAST)){

1148

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

1170

1149

if(debug){

1171

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

1172

if_entry->d_name);

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1173

1152

}

1174

return 0;

1153

return false;

1175

1154

}

1176

1155

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

1177

if(flags & IFF_NOARP){

1156

if(ifr->ifr_flags & IFF_NOARP){

1178

1157

if(debug){

1179

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

1180

if_entry->d_name);

1158

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

1159

ifname);

1181

1160

}

1182

return 0;

1161

return false;

1183

1162

}

1163

1184

1164

/* Accept this device */

1185

1165

if(debug){

1186

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

1187

if_entry->d_name);

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1188

1235

}

1189

1236

return 1;

1190

1237

}

1200

1247

return 1;

1201

1248

}

1202

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1203

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1308

int ret;

1205

1309

struct timespec now;

1206

1310

struct timespec waited_time;

1207

1311

intmax_t block_time;

1208

1312

1209

1313

while(true){

1210

1314

if(mc.current_server == NULL){

1211

1315

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1316

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

1317

" No timeout!\n");

1213

1318

}

1214

1319

ret = avahi_simple_poll_iterate(s, -1);

1215

1320

} else {

1216

1321

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1322

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

1323

" it, or wait\n");

1218

1324

}

1219

1325

/* the current time */

1220

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1330

}

1225

1331

/* Calculating in ms how long time between now and server

1226

1332

who we visted longest time ago. Now - last seen. */

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

/* total time is 10s/10,000ms.

1338

Converting to s from ms by dividing by 1,000,

1339

and ns to ms by dividing by 1,000,000. */

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1232

1344

if (debug){

1233

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

1345

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

1346

block_time);

1234

1347

}

1235

1348

1236

1349

if(block_time <= 0){

1237

1350

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1241

1354

if(ret == 0){

1242

1355

avahi_simple_poll_quit(mc.simple_poll);

1243

1356

return 0;

1244

1357

}

1245

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

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1246

1360

if(ret == -1){

1247

1361

perror_plus("clock_gettime");

1248

1362

return -1;

1249

1363

}

1250

1364

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1365

block_time = 0; /* Call avahi to find new Mandos

1366

servers, but don't block */

1252

1367

}

1253

1368

1254

1369

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

1255

1370

}

1256

1371

if(ret != 0){

1257

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

1372

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

1258

1373

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

1259

1374

}

1260

1375

}

1261

1376

}

1262

1377

}

1263

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1436

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1475

}

1476

1264

1477

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

1265

1478

AvahiSServiceBrowser *sb = NULL;

1266

1479

int error;

1283

1496

bool gnutls_initialized = false;

1284

1497

bool gpgme_initialized = false;

1285

1498

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1499

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

1500

retrying the same server again */

1287

1501

1288

1502

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1503

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1347

1561

.arg = "SECONDS",

1348

1562

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

1349

1563

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1350

1568

/*

1351

1569

* These reproduce what we would get without ARGP_NO_HELP

1352

1570

*/

1400

1618

errno = 0;

1401

1619

retry_interval = strtod(arg, &tmp);

1402

1620

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

1403

or (retry_interval * 1000) > INT_MAX){

1621

or (retry_interval * 1000) > INT_MAX

1622

or retry_interval < 0){

1404

1623

argp_error(state, "Bad retry interval");

1405

1624

}

1406

1625

break;

1626

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

1627

hookdir = arg;

1628

break;

1407

1629

/*

1408

1630

* These reproduce what we would get without ARGP_NO_HELP

1409

1631

*/

1415

1637

argp_state_help(state, state->out_stream,

1416

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

1639

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

1418

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1419

1643

exit(argp_err_exit_status);

1420

1644

break;

1421

1645

default:

1444

1668

goto end;

1445

1669

}

1446

1670

}

1671

1672

{

1673

/* Work around Debian bug #633582:

1674

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

}

1732

}

1733

1734

/* Run network hooks */

1735

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

1751

}

1447

1752

1448

1753

if(not debug){

1449

1754

avahi_set_log_function(empty_log);

1450

1755

}

1451

1756

1452

1757

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

1453

1758

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1455

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1456

1768

if(ret >= 1){

1457

/* Pick the first good interface */

1769

/* Pick the first interface returned */

1458

1770

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

1459

1771

if(debug){

1460

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

1772

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

1461

1773

}

1462

1774

if(interface == NULL){

1463

1775

perror_plus("malloc");

1468

1780

free(direntries);

1469

1781

} else {

1470

1782

free(direntries);

1471

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

1783

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

1472

1784

exitcode = EXIT_FAILURE;

1473

1785

goto end;

1474

1786

}

1480

1792

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

1481

1793

mc.simple_poll = avahi_simple_poll_new();

1482

1794

if(mc.simple_poll == NULL){

1483

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

1795

fprintf_plus(stderr,

1796

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

1484

1797

exitcode = EX_UNAVAILABLE;

1485

1798

goto end;

1486

1799

}

1552

1865

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

1553

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

1867

if(if_index == 0){

1555

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

1868

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

1556

1869

exitcode = EX_UNAVAILABLE;

1557

1870

goto end;

1558

1871

}

1645

1958

goto end;

1646

1959

}

1647

1960

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1961

/* Sleep checking until interface is running.

1962

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

1649

1963

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

1650

1964

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

1651

1965

if(ret == -1){

1677

1991

#endif /* __linux__ */

1678

1992

/* Lower privileges */

1679

1993

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1692

1998

}

1693

1999

}

1694

2000

1698

2004

1699

2005

ret = init_gnutls_global(pubkey, seckey);

1700

2006

if(ret == -1){

1701

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

2007

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

1702

2008

exitcode = EX_UNAVAILABLE;

1703

2009

goto end;

1704

2010

} else {

1720

2026

}

1721

2027

1722

2028

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

1723

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

2029

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

1724

2030

exitcode = EX_UNAVAILABLE;

1725

2031

goto end;

1726

2032

} else {

1736

2042

/* (Mainly meant for debugging) */

1737

2043

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

1738

2044

if(address == NULL){

1739

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

2045

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

1740

2046

exitcode = EX_USAGE;

1741

2047

goto end;

1742

2048

}

1750

2056

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

1751

2057

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

1752

2058

or tmpmax != (uint16_t)tmpmax){

1753

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

2059

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

1754

2060

exitcode = EX_USAGE;

1755

2061

goto end;

1756

2062

}

1761

2067

1762

2068

port = (uint16_t)tmpmax;

1763

2069

*address = '\0';

1764

address = connect_to;

1765

2070

/* Colon in address indicates IPv6 */

1766

2071

int af;

1767

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

2072

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

1768

2073

af = AF_INET6;

2074

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

2075

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

2076

{

2077

connect_to++;

2078

address[-1] = '\0';

2079

}

1769

2080

} else {

1770

2081

af = AF_INET;

1771

2082

}

2083

address = connect_to;

1772

2084

1773

2085

if(quit_now){

1774

2086

goto end;

1775

2087

}

1776

2088

1777

2089

while(not quit_now){

1778

2090

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

1779

2091

if(quit_now or ret == 0){

1780

2092

break;

1781

2093

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

2094

if(debug){

2095

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

2096

(int)retry_interval);

2097

}

2098

sleep((int)retry_interval);

2099

}

2100

1785

2101

if (not quit_now){

1786

2102

exitcode = EXIT_SUCCESS;

1787

2103

}

1788

2104

1789

2105

goto end;

1790

2106

}

1791

2107

1813

2129

1814

2130

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

1815

2131

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2132

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

2133

avahi_strerror(error));

1818

2134

exitcode = EX_UNAVAILABLE;

1819

2135

goto end;

1820

2136

}

1828

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

2145

NULL, 0, browse_callback, NULL);

1830

2146

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

1833

2149

exitcode = EX_UNAVAILABLE;

1834

2150

goto end;

1835

2151

}

1841

2157

/* Run the main loop */

1842

2158

1843

2159

if(debug){

1844

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

2160

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

1845

2161

}

1846

2162

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

1848

2165

if(debug){

1849

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

1850

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

2166

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

2167

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

1851

2168

}

1852

2169

1853

2170

end:

1854

2171

1855

2172

if(debug){

1856

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

2173

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

1857

2174

}

1858

2175

1859

2176

/* Cleanup things */

1876

2193

gpgme_release(mc.ctx);

1877

2194

}

1878

2195

1879

/* cleans up the circular linked list of mandos servers the client has seen */

2196

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

2197

has seen */

1880

2198

if(mc.current_server != NULL){

1881

2199

mc.current_server->prev->next = NULL;

1882

2200

while(mc.current_server != NULL){

1886

2204

}

1887

2205

}

1888

2206

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

2207

/* Re-raise priviliges */

2208

{

1892

2209

errno = 0;

1893

2210

ret = seteuid(0);

1894

2211

if(ret == -1){

1895

2212

perror_plus("seteuid");

1896

2213

}

1897

if(geteuid() == 0){

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

1898

2221

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

1899

2222

if(ret == -1){

1900

2223

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

2224

} else if(network.ifr_flags & IFF_UP){

1902

2225

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

1903

2226

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

1904

2227

if(ret == -1){

1909

2232

if(ret == -1){

1910

2233

perror_plus("close");

1911

2234

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

2235

}

1919

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

1920

2243

1921

2244

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

1922

2245

if(tempdir_created){

1923

2246

struct dirent **direntries = NULL;

1924

2247

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

1928

2252

direntry = direntries[i];

1929

2253

char *fullname = NULL;

1930

2254

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

1935

2259

}

1936

2260

ret = remove(fullname);

1937

2261

if(ret == -1){

1938

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

1939

strerror(errno));

2262

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

2263

strerror(errno));

1940

2264

}

1941

2265

free(fullname);

1942

2266

}

1943

2267

}

1944

2268

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

2269

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

1946

2270

free(direntries);

1947

if (ret == -1){

2271

if (numentries == -1){

1948

2272

perror_plus("scandir");

1949

2273

}

1950

2274

ret = rmdir(tempdir);