/mandos/release : 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(),

73

72

*/

74

73

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

75

74

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

76

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

77

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

75

setgid(), pause() */

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

#include <grp.h> /* setgroups() */

91

87

92

88

#ifdef __linux__

93

89

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

111

107

init_gnutls_session(),

112

108

GNUTLS_* */

113

109

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

116

112

117

113

/* GPGME */

118

114

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

126

122

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

127

123

#define SECKEY "seckey.txt"

128

124

#define PUBKEY "pubkey.txt"

129

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

130

125

131

126

bool debug = false;

132

127

static const char mandos_protocol_version[] = "1";

133

128

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

134

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

129

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

135

130

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

136

131

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

132

139

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

133

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

140

134

typedef struct server{

141

135

const char *ip;

142

136

uint16_t port;

162

156

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

163

157

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

164

158

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

159

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

167

160

168

161

sig_atomic_t quit_now = 0;

169

162

int signal_received = 0;

170

163

171

164

/* Function to use when printing errors */

172

165

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

166

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

175

167

perror(print_text);

176

168

}

177

169

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

187

170

/*

188

171

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

189

172

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

190

173

* "buffer_length" is how much is already used.

191

174

*/

192

175

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

176

size_t buffer_capacity){

194

177

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

178

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

196

179

if(buffer == NULL){

201

184

return buffer_capacity;

202

185

}

203

186

204

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

205

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

206

int af){

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

207

190

int ret;

208

191

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

209

192

if(new_server == NULL){

211

194

return -1;

212

195

}

213

196

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

197

.port = port,

198

.if_index = if_index,

199

.af = af };

217

200

if(new_server->ip == NULL){

218

201

perror_plus("strdup");

219

return -1;

202

return -1;

220

203

}

221

/* Special case of first server */

204

/* uniqe case of first server */

222

205

if (mc.current_server == NULL){

223

206

new_server->next = new_server;

224

207

new_server->prev = new_server;

225

208

mc.current_server = new_server;

226

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

209

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

227

210

} else {

228

211

new_server->next = mc.current_server;

229

212

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

241

224

/*

242

225

* Initialize GPGME.

243

226

*/

244

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

245

const char *tempdir){

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

246

229

gpgme_error_t rc;

247

230

gpgme_engine_info_t engine_info;

248

231

263

246

264

247

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

248

if(rc != GPG_ERR_NO_ERROR){

266

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

267

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));

268

251

return false;

269

252

}

270

253

271

254

rc = gpgme_op_import(mc.ctx, pgp_data);

272

255

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

275

258

return false;

276

259

}

277

260

284

267

}

285

268

286

269

if(debug){

287

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

270

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

288

271

}

289

272

290

273

/* Init GPGME */

291

274

gpgme_check_version(NULL);

292

275

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

276

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

296

279

return false;

297

280

}

298

281

299

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

282

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

300

283

rc = gpgme_get_engine_info(&engine_info);

301

284

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

304

287

return false;

305

288

}

306

289

while(engine_info != NULL){

312

295

engine_info = engine_info->next;

313

296

}

314

297

if(engine_info == NULL){

315

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

316

tempdir);

298

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

317

299

return false;

318

300

}

319

301

320

302

/* Create new GPGME "context" */

321

303

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

322

304

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

326

307

return false;

327

308

}

328

309

347

328

ssize_t plaintext_length = 0;

348

329

349

330

if(debug){

350

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

331

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

351

332

}

352

333

353

334

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

354

335

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

336

0);

356

337

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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));

359

340

return -1;

360

341

}

361

342

362

343

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

363

344

rc = gpgme_data_new(&dh_plain);

364

345

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

368

348

gpgme_data_release(dh_crypto);

369

349

return -1;

370

350

}

373

353

data buffer */

374

354

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

375

355

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

378

358

plaintext_length = -1;

379

359

if(debug){

380

360

gpgme_decrypt_result_t result;

381

361

result = gpgme_op_decrypt_result(mc.ctx);

382

362

if(result == NULL){

383

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

363

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

384

364

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

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);

389

369

if(result->file_name != NULL){

390

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

370

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

391

371

}

392

372

gpgme_recipient_t recipient;

393

373

recipient = result->recipients;

394

374

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "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");

402

381

recipient = recipient->next;

403

382

}

404

383

}

407

386

}

408

387

409

388

if(debug){

410

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

389

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

411

390

}

412

391

413

392

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

420

399

*plaintext = NULL;

421

400

while(true){

422

401

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

402

(size_t)plaintext_length,

403

plaintext_capacity);

425

404

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

429

408

}

430

409

431

410

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

444

423

}

445

424

446

425

if(debug){

447

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

426

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

448

427

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

449

428

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

450

429

}

472

451

/* GnuTLS log function callback */

473

452

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

474

453

const char* string){

475

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

454

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

476

455

}

477

456

478

457

static int init_gnutls_global(const char *pubkeyfilename,

480

459

int ret;

481

460

482

461

if(debug){

483

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

462

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

484

463

}

485

464

486

465

ret = gnutls_global_init();

487

466

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

467

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

468

safer_gnutls_strerror(ret));

490

469

return -1;

491

470

}

492

471

499

478

}

500

479

501

480

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

481

gnutls_certificate_allocate_credentials(&mc.cred);

503

482

if(ret != GNUTLS_E_SUCCESS){

504

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

505

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));

506

488

gnutls_global_deinit();

507

489

return -1;

508

490

}

509

491

510

492

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

493

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

494

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

495

seckeyfilename);

515

496

}

516

497

517

498

ret = gnutls_certificate_set_openpgp_key_file

518

499

(mc.cred, pubkeyfilename, seckeyfilename,

519

500

GNUTLS_OPENPGP_FMT_BASE64);

520

501

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

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));

526

507

goto globalfail;

527

508

}

528

509

529

510

/* GnuTLS server initialization */

530

511

ret = gnutls_dh_params_init(&mc.dh_params);

531

512

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

513

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

514

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

535

515

goto globalfail;

536

516

}

537

517

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

538

518

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

541

521

goto globalfail;

542

522

}

543

523

563

543

}

564

544

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

565

545

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

569

548

}

570

549

571

550

{

578

557

}

579

558

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

580

559

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

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));

584

563

gnutls_deinit(*session);

585

564

return -1;

586

565

}

595

574

}

596

575

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

597

576

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

600

579

gnutls_deinit(*session);

601

580

return -1;

602

581

}

647

626

pf = PF_INET;

648

627

break;

649

628

default:

650

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

629

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

651

630

errno = EINVAL;

652

631

return -1;

653

632

}

658

637

}

659

638

660

639

if(debug){

661

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

662

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

663

642

}

664

643

665

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

691

670

}

692

671

if(ret == 0){

693

672

int e = errno;

694

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

673

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

695

674

errno = e;

696

675

goto mandos_end;

697

676

}

702

681

703

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

683

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

705

-Wunreachable-code*/

684

-Wunreachable-code*/

706

685

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

709

688

errno = EINVAL;

710

689

goto mandos_end;

711

690

}

729

708

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

730

709

perror_plus("if_indextoname");

731

710

} else {

732

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

733

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

711

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

712

ip, interface, port);

734

713

}

735

714

} else {

736

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

737

ip, port);

715

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

716

port);

738

717

}

739

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

729

perror_plus("inet_ntop");

751

730

} else {

752

731

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

753

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

732

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

754

733

}

755

734

}

756

735

}

784

763

while(true){

785

764

size_t out_size = strlen(out);

786

765

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

787

out_size - written));

766

out_size - written));

788

767

if(ret == -1){

789

768

int e = errno;

790

769

perror_plus("write");

810

789

}

811

790

812

791

if(debug){

813

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

792

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

814

793

}

815

794

816

795

if(quit_now){

817

796

errno = EINTR;

818

797

goto mandos_end;

819

798

}

820

821

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

799

800

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

822

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

802

824

803

if(quit_now){

836

815

837

816

if(ret != GNUTLS_E_SUCCESS){

838

817

if(debug){

839

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

818

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

840

819

gnutls_perror(ret);

841

820

}

842

821

errno = EPROTO;

846

825

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

847

826

848

827

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

828

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

829

ip);

851

830

}

852

831

853

832

while(true){

858

837

}

859

838

860

839

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

840

buffer_capacity);

862

841

if(buffer_capacity == 0){

863

842

int e = errno;

864

843

perror_plus("incbuffer");

891

870

}

892

871

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

893

872

if(ret < 0){

894

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

895

"***\n");

873

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

896

874

gnutls_perror(ret);

897

875

errno = EPROTO;

898

876

goto mandos_end;

899

877

}

900

878

break;

901

879

default:

902

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

903

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

904

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

883

errno = EIO;

906

884

goto mandos_end;

911

889

}

912

890

913

891

if(debug){

914

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

892

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

915

893

}

916

894

917

895

if(quit_now){

929

907

930

908

if(buffer_length > 0){

931

909

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

933

912

&decrypted_buffer);

934

913

if(decrypted_buffer_size >= 0){

935

914

946

925

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

947

926

int e = errno;

948

927

if(debug){

949

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

950

strerror(errno));

928

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

929

strerror(errno));

951

930

}

952

931

errno = e;

953

932

goto mandos_end;

1010

989

switch(event){

1011

990

default:

1012

991

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

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)));

1017

995

break;

1018

996

1019

997

case AVAHI_RESOLVER_FOUND:

1021

999

char ip[AVAHI_ADDRESS_STR_MAX];

1022

1000

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

1023

1001

if(debug){

1024

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

1025

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

1026

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);

1027

1005

}

1028

1006

int ret = start_mandos_communication(ip, port, interface,

1029

1007

avahi_proto_to_af(proto));

1061

1039

default:

1062

1040

case AVAHI_BROWSER_FAILURE:

1063

1041

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1066

1044

avahi_simple_poll_quit(mc.simple_poll);

1067

1045

return;

1068

1046

1075

1053

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

1076

1054

name, type, domain, protocol, 0,

1077

1055

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

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)));

1081

1058

break;

1082

1059

1083

1060

case AVAHI_BROWSER_REMOVE:

1086

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

1065

if(debug){

1089

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

1090

" searching...\n");

1066

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

1091

1067

}

1092

1068

break;

1093

1069

}

1094

1070

}

1095

1071

1096

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

1072

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

1097

1073

static void handle_sigterm(int sig){

1098

1074

if(quit_now){

1099

1075

return;

1108

1084

errno = old_errno;

1109

1085

}

1110

1086

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

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){

1122

1143

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1124

1146

}

1125

return false;

1147

free(flagstring);

1148

return 0;

1126

1149

}

1127

return true;

1128

}

1129

1130

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

1131

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1132

1152

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1134

1154

if(debug){

1135

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

1136

ifname);

1155

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

1156

if_entry->d_name);

1137

1157

}

1138

return false;

1158

return 0;

1139

1159

}

1140

1160

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

1141

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

1161

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

1142

1162

if(debug){

1143

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

1144

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

1163

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

1164

if_entry->d_name);

1145

1165

}

1146

return true;

1166

return 1;

1147

1167

}

1148

1168

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

1149

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

1169

if(not (flags & IFF_BROADCAST)){

1150

1170

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1171

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

1172

if_entry->d_name);

1153

1173

}

1154

return false;

1174

return 0;

1155

1175

}

1156

1176

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1158

1178

if(debug){

1159

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

1160

ifname);

1179

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

1180

if_entry->d_name);

1161

1181

}

1162

return false;

1182

return 0;

1163

1183

}

1164

1165

1184

/* Accept this device */

1166

1185

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1186

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

1187

if_entry->d_name);

1236

1188

}

1237

1189

return 1;

1238

1190

}

1248

1200

return 1;

1249

1201

}

1250

1202

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

1204

int ret;

1314

1205

struct timespec now;

1315

1206

struct timespec waited_time;

1316

1207

intmax_t block_time;

1317

1208

1318

1209

while(true){

1319

1210

if(mc.current_server == NULL){

1320

1211

if (debug){

1321

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

1322

" No timeout!\n");

1212

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

1323

1213

}

1324

1214

ret = avahi_simple_poll_iterate(s, -1);

1325

1215

} else {

1326

1216

if (debug){

1327

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

1328

" it, or wait\n");

1217

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

1329

1218

}

1330

1219

/* the current time */

1331

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1335

1224

}

1336

1225

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

1337

1226

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

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

1349

1232

if (debug){

1350

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

1351

block_time);

1233

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

1352

1234

}

1353

1235

1354

1236

if(block_time <= 0){

1355

1237

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1359

1241

if(ret == 0){

1360

1242

avahi_simple_poll_quit(mc.simple_poll);

1361

1243

return 0;

1362

1244

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1245

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

1365

1246

if(ret == -1){

1366

1247

perror_plus("clock_gettime");

1367

1248

return -1;

1368

1249

}

1369

1250

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1251

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

1372

1252

}

1373

1253

1374

1254

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

1375

1255

}

1376

1256

if(ret != 0){

1377

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

1257

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

1378

1258

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

1379

1259

}

1380

1260

}

1381

1261

}

1382

1262

}

1383

1263

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1511

1264

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

1512

1265

AvahiSServiceBrowser *sb = NULL;

1513

1266

int error;

1530

1283

bool gnutls_initialized = false;

1531

1284

bool gpgme_initialized = false;

1532

1285

float delay = 2.5f;

1533

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

1534

retrying the same server again */

1286

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

1535

1287

1536

1288

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1537

1289

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1595

1347

.arg = "SECONDS",

1596

1348

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

1597

1349

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

1350

/*

1603

1351

* These reproduce what we would get without ARGP_NO_HELP

1604

1352

*/

1652

1400

errno = 0;

1653

1401

retry_interval = strtod(arg, &tmp);

1654

1402

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1403

or (retry_interval * 1000) > INT_MAX){

1657

1404

argp_error(state, "Bad retry interval");

1658

1405

}

1659

1406

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

1407

/*

1664

1408

* These reproduce what we would get without ARGP_NO_HELP

1665

1409

*/

1671

1415

argp_state_help(state, state->out_stream,

1672

1416

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1417

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1418

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

1677

1419

exit(argp_err_exit_status);

1678

1420

break;

1679

1421

default:

1702

1444

goto end;

1703

1445

}

1704

1446

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1772

}

1773

1447

1774

1448

if(not debug){

1775

1449

avahi_set_log_function(empty_log);

1776

1450

}

1777

1451

1778

1452

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

1779

1453

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1782

1455

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

1456

if(ret >= 1){

1790

/* Pick the first interface returned */

1457

/* Pick the first good interface */

1791

1458

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

1792

1459

if(debug){

1793

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

1460

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

1794

1461

}

1795

1462

if(interface == NULL){

1796

1463

perror_plus("malloc");

1801

1468

free(direntries);

1802

1469

} else {

1803

1470

free(direntries);

1804

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

1471

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

1805

1472

exitcode = EXIT_FAILURE;

1806

1473

goto end;

1807

1474

}

1813

1480

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

1814

1481

mc.simple_poll = avahi_simple_poll_new();

1815

1482

if(mc.simple_poll == NULL){

1816

fprintf_plus(stderr,

1817

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

1483

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

1818

1484

exitcode = EX_UNAVAILABLE;

1819

1485

goto end;

1820

1486

}

1886

1552

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

1887

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

1554

if(if_index == 0){

1889

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

1555

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

1890

1556

exitcode = EX_UNAVAILABLE;

1891

1557

goto end;

1892

1558

}

1979

1645

goto end;

1980

1646

}

1981

1647

}

1982

/* Sleep checking until interface is running.

1983

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 */

1984

1649

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

1985

1650

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

1986

1651

if(ret == -1){

2012

1677

#endif /* __linux__ */

2013

1678

/* Lower privileges */

2014

1679

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

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

}

2019

1692

}

2020

1693

}

2021

1694

2025

1698

2026

1699

ret = init_gnutls_global(pubkey, seckey);

2027

1700

if(ret == -1){

2028

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

1701

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

2029

1702

exitcode = EX_UNAVAILABLE;

2030

1703

goto end;

2031

1704

} else {

2047

1720

}

2048

1721

2049

1722

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

2050

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

1723

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

2051

1724

exitcode = EX_UNAVAILABLE;

2052

1725

goto end;

2053

1726

} else {

2063

1736

/* (Mainly meant for debugging) */

2064

1737

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

2065

1738

if(address == NULL){

2066

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

1739

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

2067

1740

exitcode = EX_USAGE;

2068

1741

goto end;

2069

1742

}

2077

1750

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

2078

1751

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

2079

1752

or tmpmax != (uint16_t)tmpmax){

2080

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

1753

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

2081

1754

exitcode = EX_USAGE;

2082

1755

goto end;

2083

1756

}

2088

1761

2089

1762

port = (uint16_t)tmpmax;

2090

1763

*address = '\0';

1764

address = connect_to;

2091

1765

/* Colon in address indicates IPv6 */

2092

1766

int af;

2093

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

1767

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

2094

1768

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

2101

1769

} else {

2102

1770

af = AF_INET;

2103

1771

}

2104

address = connect_to;

2105

1772

2106

1773

if(quit_now){

2107

1774

goto end;

2108

1775

}

2109

1776

2110

1777

while(not quit_now){

2111

1778

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

2112

1779

if(quit_now or ret == 0){

2113

1780

break;

2114

1781

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

1782

sleep((int)retry_interval or 1);

1783

};

1784

2122

1785

if (not quit_now){

2123

1786

exitcode = EXIT_SUCCESS;

2124

1787

}

2125

1788

2126

1789

goto end;

2127

1790

}

2128

1791

2150

1813

2151

1814

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

2152

1815

if(mc.server == NULL){

2153

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

2154

avahi_strerror(error));

1816

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

1817

avahi_strerror(error));

2155

1818

exitcode = EX_UNAVAILABLE;

2156

1819

goto end;

2157

1820

}

2165

1828

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

1829

NULL, 0, browse_callback, NULL);

2167

1830

if(sb == NULL){

2168

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

2169

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)));

2170

1833

exitcode = EX_UNAVAILABLE;

2171

1834

goto end;

2172

1835

}

2178

1841

/* Run the main loop */

2179

1842

2180

1843

if(debug){

2181

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

1844

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

2182

1845

}

2183

1846

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

1847

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

2186

1848

if(debug){

2187

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

2188

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

1849

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

1850

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

2189

1851

}

2190

1852

2191

1853

end:

2192

1854

2193

1855

if(debug){

2194

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

1856

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

2195

1857

}

2196

1858

2197

1859

/* Cleanup things */

2213

1875

if(gpgme_initialized){

2214

1876

gpgme_release(mc.ctx);

2215

1877

}

2216

2217

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

2218

has seen */

1878

1879

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

2219

1880

if(mc.current_server != NULL){

2220

1881

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

2221

1882

while(mc.current_server != NULL){

2225

1886

}

2226

1887

}

2227

1888

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

2233

1892

errno = 0;

2234

1893

ret = seteuid(0);

2235

1894

if(ret == -1){

2236

1895

perror_plus("seteuid");

2237

1896

}

2238

2239

/* Take down the network interface */

2240

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

1897

if(geteuid() == 0){

2241

1898

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

2242

1899

if(ret == -1){

2243

1900

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

1901

} else if(network.ifr_flags & IFF_UP) {

2245

1902

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

2246

1903

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

2247

1904

if(ret == -1){

2252

1909

if(ret == -1){

2253

1910

perror_plus("close");

2254

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

2255

1918

}

2256

1919

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

1920

2264

1921

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

2265

1922

if(tempdir_created){

2266

1923

struct dirent **direntries = NULL;

2267

1924

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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++){

2272

1928

direntry = direntries[i];

2273

1929

char *fullname = NULL;

2274

1930

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

2279

1935

}

2280

1936

ret = remove(fullname);

2281

1937

if(ret == -1){

2282

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

2283

strerror(errno));

1938

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

1939

strerror(errno));

2284

1940

}

2285

1941

free(fullname);

2286

1942

}

2287

1943

}

2288

1944

2289

/* 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 */

2290

1946

free(direntries);

2291

if (numentries == -1){

1947

if (ret == -1){

2292

1948

perror_plus("scandir");

2293

1949

}

2294

1950

ret = rmdir(tempdir);