/mandos/trunk : revision 24.1.174

26

* along with this program. If not, see

27

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

28

*

29

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

29

* Contact the authors at <mandos@fukt.bsnet.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(), S_ISREG */

56

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

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,

66

program_invocation_short_name */

65

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

67

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

87

91

88

#ifdef __linux__

92

89

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

110

107

init_gnutls_session(),

111

108

GNUTLS_* */

112

109

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

115

112

116

113

/* GPGME */

117

114

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

125

122

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

126

123

#define SECKEY "seckey.txt"

127

124

#define PUBKEY "pubkey.txt"

128

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

129

125

130

126

bool debug = false;

131

127

static const char mandos_protocol_version[] = "1";

132

128

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

133

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

129

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

134

130

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

135

131

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

132

138

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

133

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

139

134

typedef struct server{

140

135

const char *ip;

141

136

uint16_t port;

161

156

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

162

157

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

163

158

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

159

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

166

160

167

161

sig_atomic_t quit_now = 0;

168

162

int signal_received = 0;

169

163

170

164

/* Function to use when printing errors */

171

165

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

166

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

174

167

perror(print_text);

175

168

}

176

169

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

186

170

/*

187

171

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

188

172

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

189

173

* "buffer_length" is how much is already used.

190

174

*/

191

175

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

176

size_t buffer_capacity){

193

177

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

178

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

195

179

if(buffer == NULL){

200

184

return buffer_capacity;

201

185

}

202

186

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){

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

206

190

int ret;

207

191

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

208

192

if(new_server == NULL){

210

194

return -1;

211

195

}

212

196

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

197

.port = port,

198

.if_index = if_index,

199

.af = af };

216

200

if(new_server->ip == NULL){

217

201

perror_plus("strdup");

218

return -1;

202

return -1;

219

203

}

220

/* Special case of first server */

204

/* uniqe case of first server */

221

205

if (mc.current_server == NULL){

222

206

new_server->next = new_server;

223

207

new_server->prev = new_server;

224

208

mc.current_server = new_server;

225

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

209

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

226

210

} else {

227

211

new_server->next = mc.current_server;

228

212

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

240

224

/*

241

225

* Initialize GPGME.

242

226

*/

243

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

244

const char *tempdir){

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

245

229

gpgme_error_t rc;

246

230

gpgme_engine_info_t engine_info;

247

231

262

246

263

247

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

248

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

249

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

250

gpgme_strsource(rc), gpgme_strerror(rc));

267

251

return false;

268

252

}

269

253

270

254

rc = gpgme_op_import(mc.ctx, pgp_data);

271

255

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

274

258

return false;

275

259

}

276

260

283

267

}

284

268

285

269

if(debug){

286

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

270

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

287

271

}

288

272

289

273

/* Init GPGME */

290

274

gpgme_check_version(NULL);

291

275

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

276

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

295

279

return false;

296

280

}

297

281

298

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

282

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

299

283

rc = gpgme_get_engine_info(&engine_info);

300

284

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

303

287

return false;

304

288

}

305

289

while(engine_info != NULL){

311

295

engine_info = engine_info->next;

312

296

}

313

297

if(engine_info == NULL){

314

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

315

tempdir);

298

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

316

299

return false;

317

300

}

318

301

319

302

/* Create new GPGME "context" */

320

303

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

321

304

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

325

307

return false;

326

308

}

327

309

346

328

ssize_t plaintext_length = 0;

347

329

348

330

if(debug){

349

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

331

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

350

332

}

351

333

352

334

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

353

335

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

336

0);

355

337

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

358

340

return -1;

359

341

}

360

342

361

343

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

362

344

rc = gpgme_data_new(&dh_plain);

363

345

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

367

348

gpgme_data_release(dh_crypto);

368

349

return -1;

369

350

}

372

353

data buffer */

373

354

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

374

355

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

377

358

plaintext_length = -1;

378

359

if(debug){

379

360

gpgme_decrypt_result_t result;

380

361

result = gpgme_op_decrypt_result(mc.ctx);

381

362

if(result == NULL){

382

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

363

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

383

364

} else {

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);

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

388

369

if(result->file_name != NULL){

389

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

370

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

390

371

}

391

372

gpgme_recipient_t recipient;

392

373

recipient = result->recipients;

393

374

while(recipient != NULL){

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");

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");

401

381

recipient = recipient->next;

402

382

}

403

383

}

406

386

}

407

387

408

388

if(debug){

409

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

389

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

410

390

}

411

391

412

392

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

419

399

*plaintext = NULL;

420

400

while(true){

421

401

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

402

(size_t)plaintext_length,

403

plaintext_capacity);

424

404

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

428

408

}

429

409

430

410

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

443

423

}

444

424

445

425

if(debug){

446

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

426

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

447

427

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

448

428

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

449

429

}

471

451

/* GnuTLS log function callback */

472

452

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

473

453

const char* string){

474

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

454

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

475

455

}

476

456

477

457

static int init_gnutls_global(const char *pubkeyfilename,

479

459

int ret;

480

460

481

461

if(debug){

482

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

462

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

483

463

}

484

464

485

465

ret = gnutls_global_init();

486

466

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

467

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

468

safer_gnutls_strerror(ret));

489

469

return -1;

490

470

}

491

471

498

478

}

499

479

500

480

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

481

gnutls_certificate_allocate_credentials(&mc.cred);

502

482

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

505

488

gnutls_global_deinit();

506

489

return -1;

507

490

}

508

491

509

492

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

493

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

494

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

495

seckeyfilename);

514

496

}

515

497

516

498

ret = gnutls_certificate_set_openpgp_key_file

517

499

(mc.cred, pubkeyfilename, seckeyfilename,

518

500

GNUTLS_OPENPGP_FMT_BASE64);

519

501

if(ret != GNUTLS_E_SUCCESS){

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));

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));

525

507

goto globalfail;

526

508

}

527

509

528

510

/* GnuTLS server initialization */

529

511

ret = gnutls_dh_params_init(&mc.dh_params);

530

512

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

513

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

514

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

534

515

goto globalfail;

535

516

}

536

517

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

537

518

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

540

521

goto globalfail;

541

522

}

542

523

562

543

}

563

544

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

564

545

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

568

548

}

569

549

570

550

{

577

557

}

578

558

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

579

559

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

583

563

gnutls_deinit(*session);

584

564

return -1;

585

565

}

594

574

}

595

575

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

596

576

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

599

579

gnutls_deinit(*session);

600

580

return -1;

601

581

}

646

626

pf = PF_INET;

647

627

break;

648

628

default:

649

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

629

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

650

630

errno = EINVAL;

651

631

return -1;

652

632

}

657

637

}

658

638

659

639

if(debug){

660

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

661

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

662

642

}

663

643

664

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

670

}

691

671

if(ret == 0){

692

672

int e = errno;

693

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

673

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

694

674

errno = e;

695

675

goto mandos_end;

696

676

}

701

681

702

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

683

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

704

-Wunreachable-code*/

684

-Wunreachable-code*/

705

685

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

708

688

errno = EINVAL;

709

689

goto mandos_end;

710

690

}

728

708

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

729

709

perror_plus("if_indextoname");

730

710

} else {

731

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

732

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

711

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

712

ip, interface, port);

733

713

}

734

714

} else {

735

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

736

ip, port);

715

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

716

port);

737

717

}

738

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

729

perror_plus("inet_ntop");

750

730

} else {

751

731

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

752

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

732

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

753

733

}

754

734

}

755

735

}

783

763

while(true){

784

764

size_t out_size = strlen(out);

785

765

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

786

out_size - written));

766

out_size - written));

787

767

if(ret == -1){

788

768

int e = errno;

789

769

perror_plus("write");

809

789

}

810

790

811

791

if(debug){

812

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

792

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

813

793

}

814

794

815

795

if(quit_now){

816

796

errno = EINTR;

817

797

goto mandos_end;

818

798

}

819

820

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

799

800

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

821

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

802

823

803

if(quit_now){

835

815

836

816

if(ret != GNUTLS_E_SUCCESS){

837

817

if(debug){

838

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

818

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

839

819

gnutls_perror(ret);

840

820

}

841

821

errno = EPROTO;

845

825

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

846

826

847

827

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

828

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

829

ip);

850

830

}

851

831

852

832

while(true){

857

837

}

858

838

859

839

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

840

buffer_capacity);

861

841

if(buffer_capacity == 0){

862

842

int e = errno;

863

843

perror_plus("incbuffer");

890

870

}

891

871

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

892

872

if(ret < 0){

893

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

894

"***\n");

873

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

895

874

gnutls_perror(ret);

896

875

errno = EPROTO;

897

876

goto mandos_end;

898

877

}

899

878

break;

900

879

default:

901

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

902

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

903

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

883

errno = EIO;

905

884

goto mandos_end;

910

889

}

911

890

912

891

if(debug){

913

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

892

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

914

893

}

915

894

916

895

if(quit_now){

928

907

929

908

if(buffer_length > 0){

930

909

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

932

912

&decrypted_buffer);

933

913

if(decrypted_buffer_size >= 0){

934

914

945

925

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

946

926

int e = errno;

947

927

if(debug){

948

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

949

strerror(errno));

928

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

929

strerror(errno));

950

930

}

951

931

errno = e;

952

932

goto mandos_end;

1009

989

switch(event){

1010

990

default:

1011

991

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1016

995

break;

1017

996

1018

997

case AVAHI_RESOLVER_FOUND:

1020

999

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1000

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

1022

1001

if(debug){

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);

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);

1026

1005

}

1027

1006

int ret = start_mandos_communication(ip, port, interface,

1028

1007

avahi_proto_to_af(proto));

1060

1039

default:

1061

1040

case AVAHI_BROWSER_FAILURE:

1062

1041

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1065

1044

avahi_simple_poll_quit(mc.simple_poll);

1066

1045

return;

1067

1046

1074

1053

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

1075

1054

name, type, domain, protocol, 0,

1076

1055

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1056

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

1057

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

1080

1058

break;

1081

1059

1082

1060

case AVAHI_BROWSER_REMOVE:

1085

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1065

if(debug){

1088

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

1089

" searching...\n");

1066

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

1090

1067

}

1091

1068

break;

1092

1069

}

1093

1070

}

1094

1071

1095

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

1072

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

1096

1073

static void handle_sigterm(int sig){

1097

1074

if(quit_now){

1098

1075

return;

1107

1084

errno = old_errno;

1108

1085

}

1109

1086

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){

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){

1121

1143

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1123

1146

}

1124

return false;

1147

free(flagstring);

1148

return 0;

1125

1149

}

1126

return true;

1127

}

1128

1129

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

1130

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

1152

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1133

1154

if(debug){

1134

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

1135

ifname);

1155

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

1156

if_entry->d_name);

1136

1157

}

1137

return false;

1158

return 0;

1138

1159

}

1139

1160

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

1140

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

1161

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

1141

1162

if(debug){

1142

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

1143

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

1163

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

1164

if_entry->d_name);

1144

1165

}

1145

return true;

1166

return 1;

1146

1167

}

1147

1168

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

1148

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

1169

if(not (flags & IFF_BROADCAST)){

1149

1170

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1171

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

1172

if_entry->d_name);

1152

1173

}

1153

return false;

1174

return 0;

1154

1175

}

1155

1176

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1157

1178

if(debug){

1158

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

1159

ifname);

1179

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

1180

if_entry->d_name);

1160

1181

}

1161

return false;

1182

return 0;

1162

1183

}

1163

1164

1184

/* Accept this device */

1165

1185

if(debug){

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;

1186

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

1187

if_entry->d_name);

1235

1188

}

1236

1189

return 1;

1237

1190

}

1247

1200

return 1;

1248

1201

}

1249

1202

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

1307

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

1204

int ret;

1309

1205

struct timespec now;

1310

1206

struct timespec waited_time;

1311

1207

intmax_t block_time;

1312

1208

1313

1209

while(true){

1314

1210

if(mc.current_server == NULL){

1315

1211

if (debug){

1316

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

1317

" No timeout!\n");

1212

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

1318

1213

}

1319

1214

ret = avahi_simple_poll_iterate(s, -1);

1320

1215

} else {

1321

1216

if (debug){

1322

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

1323

" it, or wait\n");

1217

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

1324

1218

}

1325

1219

/* the current time */

1326

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1330

1224

}

1331

1225

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

1332

1226

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

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

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

1344

1232

if (debug){

1345

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

1346

block_time);

1233

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

1347

1234

}

1348

1235

1349

1236

if(block_time <= 0){

1350

1237

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1354

1241

if(ret == 0){

1355

1242

avahi_simple_poll_quit(mc.simple_poll);

1356

1243

return 0;

1357

1244

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1245

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

1360

1246

if(ret == -1){

1361

1247

perror_plus("clock_gettime");

1362

1248

return -1;

1363

1249

}

1364

1250

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1251

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

1367

1252

}

1368

1253

1369

1254

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

1370

1255

}

1371

1256

if(ret != 0){

1372

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

1257

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

1373

1258

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

1374

1259

}

1375

1260

}

1376

1261

}

1377

1262

}

1378

1263

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

1477

1264

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

1478

1265

AvahiSServiceBrowser *sb = NULL;

1479

1266

int error;

1496

1283

bool gnutls_initialized = false;

1497

1284

bool gpgme_initialized = false;

1498

1285

float delay = 2.5f;

1499

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

1500

retrying the same server again */

1286

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

1501

1287

1502

1288

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1503

1289

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1561

1347

.arg = "SECONDS",

1562

1348

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

1563

1349

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1568

1350

/*

1569

1351

* These reproduce what we would get without ARGP_NO_HELP

1570

1352

*/

1618

1400

errno = 0;

1619

1401

retry_interval = strtod(arg, &tmp);

1620

1402

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

1621

or (retry_interval * 1000) > INT_MAX

1622

or retry_interval < 0){

1403

or (retry_interval * 1000) > INT_MAX){

1623

1404

argp_error(state, "Bad retry interval");

1624

1405

}

1625

1406

break;

1626

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

1627

hookdir = arg;

1628

break;

1629

1407

/*

1630

1408

* These reproduce what we would get without ARGP_NO_HELP

1631

1409

*/

1637

1415

argp_state_help(state, state->out_stream,

1638

1416

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

1417

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1418

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

1643

1419

exit(argp_err_exit_status);

1644

1420

break;

1645

1421

default:

1668

1444

goto end;

1669

1445

}

1670

1446

}

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

}

1752

1447

1753

1448

if(not debug){

1754

1449

avahi_set_log_function(empty_log);

1755

1450

}

1756

1451

1757

1452

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

1758

1453

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1761

1455

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

}

1768

1456

if(ret >= 1){

1769

/* Pick the first interface returned */

1457

/* Pick the first good interface */

1770

1458

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

1771

1459

if(debug){

1772

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

1460

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

1773

1461

}

1774

1462

if(interface == NULL){

1775

1463

perror_plus("malloc");

1780

1468

free(direntries);

1781

1469

} else {

1782

1470

free(direntries);

1783

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

1471

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

1784

1472

exitcode = EXIT_FAILURE;

1785

1473

goto end;

1786

1474

}

1792

1480

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

1793

1481

mc.simple_poll = avahi_simple_poll_new();

1794

1482

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1483

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

1797

1484

exitcode = EX_UNAVAILABLE;

1798

1485

goto end;

1799

1486

}

1865

1552

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

1866

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

1554

if(if_index == 0){

1868

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

1555

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

1869

1556

exitcode = EX_UNAVAILABLE;

1870

1557

goto end;

1871

1558

}

1958

1645

goto end;

1959

1646

}

1960

1647

}

1961

/* Sleep checking until interface is running.

1962

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

1648

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

1963

1649

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

1964

1650

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

1965

1651

if(ret == -1){

1991

1677

#endif /* __linux__ */

1992

1678

/* Lower privileges */

1993

1679

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

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

}

1998

1692

}

1999

1693

}

2000

1694

2004

1698

2005

1699

ret = init_gnutls_global(pubkey, seckey);

2006

1700

if(ret == -1){

2007

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

1701

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

2008

1702

exitcode = EX_UNAVAILABLE;

2009

1703

goto end;

2010

1704

} else {

2026

1720

}

2027

1721

2028

1722

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

2029

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

1723

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

2030

1724

exitcode = EX_UNAVAILABLE;

2031

1725

goto end;

2032

1726

} else {

2042

1736

/* (Mainly meant for debugging) */

2043

1737

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

2044

1738

if(address == NULL){

2045

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

1739

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

2046

1740

exitcode = EX_USAGE;

2047

1741

goto end;

2048

1742

}

2056

1750

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

2057

1751

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

2058

1752

or tmpmax != (uint16_t)tmpmax){

2059

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

1753

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

2060

1754

exitcode = EX_USAGE;

2061

1755

goto end;

2062

1756

}

2067

1761

2068

1762

port = (uint16_t)tmpmax;

2069

1763

*address = '\0';

1764

address = connect_to;

2070

1765

/* Colon in address indicates IPv6 */

2071

1766

int af;

2072

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

1767

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

2073

1768

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

}

2080

1769

} else {

2081

1770

af = AF_INET;

2082

1771

}

2083

address = connect_to;

2084

1772

2085

1773

if(quit_now){

2086

1774

goto end;

2087

1775

}

2088

1776

2089

1777

while(not quit_now){

2090

1778

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

2091

1779

if(quit_now or ret == 0){

2092

1780

break;

2093

1781

}

2094

if(debug){

2095

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

2096

(int)retry_interval);

2097

}

2098

sleep((int)retry_interval);

2099

}

2100

1782

sleep((int)retry_interval or 1);

1783

};

1784

2101

1785

if (not quit_now){

2102

1786

exitcode = EXIT_SUCCESS;

2103

1787

}

2104

1788

2105

1789

goto end;

2106

1790

}

2107

1791

2129

1813

2130

1814

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

2131

1815

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

1816

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

1817

avahi_strerror(error));

2134

1818

exitcode = EX_UNAVAILABLE;

2135

1819

goto end;

2136

1820

}

2144

1828

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

1829

NULL, 0, browse_callback, NULL);

2146

1830

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2149

1833

exitcode = EX_UNAVAILABLE;

2150

1834

goto end;

2151

1835

}

2157

1841

/* Run the main loop */

2158

1842

2159

1843

if(debug){

2160

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

1844

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

2161

1845

}

2162

1846

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

1847

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

2165

1848

if(debug){

2166

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

2167

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

1849

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

1850

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

2168

1851

}

2169

1852

2170

1853

end:

2171

1854

2172

1855

if(debug){

2173

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

1856

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

2174

1857

}

2175

1858

2176

1859

/* Cleanup things */

2193

1876

gpgme_release(mc.ctx);

2194

1877

}

2195

1878

2196

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

2197

has seen */

1879

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

2198

1880

if(mc.current_server != NULL){

2199

1881

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

2200

1882

while(mc.current_server != NULL){

2204

1886

}

2205

1887

}

2206

1888

2207

/* Re-raise priviliges */

2208

{

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

2209

1892

errno = 0;

2210

1893

ret = seteuid(0);

2211

1894

if(ret == -1){

2212

1895

perror_plus("seteuid");

2213

1896

}

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){

1897

if(geteuid() == 0){

2221

1898

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

2222

1899

if(ret == -1){

2223

1900

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

1901

} else if(network.ifr_flags & IFF_UP) {

2225

1902

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

2226

1903

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

2227

1904

if(ret == -1){

2232

1909

if(ret == -1){

2233

1910

perror_plus("close");

2234

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

2235

1918

}

2236

1919

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

1920

2244

1921

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

2245

1922

if(tempdir_created){

2246

1923

struct dirent **direntries = NULL;

2247

1924

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

1925

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

1926

if (ret > 0){

1927

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

2252

1928

direntry = direntries[i];

2253

1929

char *fullname = NULL;

2254

1930

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

2259

1935

}

2260

1936

ret = remove(fullname);

2261

1937

if(ret == -1){

2262

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

2263

strerror(errno));

1938

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

1939

strerror(errno));

2264

1940

}

2265

1941

free(fullname);

2266

1942

}

2267

1943

}

2268

1944

2269

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

1945

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

2270

1946

free(direntries);

2271

if (numentries == -1){

1947

if (ret == -1){

2272

1948

perror_plus("scandir");

2273

1949

}

2274

1950

ret = rmdir(tempdir);