/mandos/release : revision 237.7.81

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

73

*/

74

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

75

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

76

setgid(), pause() */

76

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

77

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

78

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

79

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

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

88

91

89

92

#ifdef __linux__

90

93

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

108

111

init_gnutls_session(),

109

112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

113

116

114

117

/* GPGME */

115

118

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

123

126

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

124

127

#define SECKEY "seckey.txt"

125

128

#define PUBKEY "pubkey.txt"

129

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

126

130

127

131

bool debug = false;

128

132

static const char mandos_protocol_version[] = "1";

129

133

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

130

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

134

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

131

135

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

132

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

133

138

134

139

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

135

140

typedef struct server{

170

175

perror(print_text);

171

176

}

172

177

178

__attribute__((format (gnu_printf, 2, 3)))

179

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

180

va_list ap;

181

va_start (ap, format);

182

183

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

184

program_invocation_short_name));

185

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

186

}

187

173

188

/*

174

189

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

175

190

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

176

191

* "buffer_length" is how much is already used.

177

192

*/

178

193

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

194

size_t buffer_capacity){

180

195

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

196

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

182

197

if(buffer == NULL){

187

202

return buffer_capacity;

188

203

}

189

204

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

205

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

206

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

207

int af){

193

208

int ret;

194

209

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

195

210

if(new_server == NULL){

196

211

perror_plus("malloc");

197

return -1;

212

return false;

198

213

}

199

214

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

200

.port = port,

201

.if_index = if_index,

202

.af = af };

215

.port = port,

216

.if_index = if_index,

217

.af = af };

203

218

if(new_server->ip == NULL){

204

219

perror_plus("strdup");

205

return -1;

220

return false;

206

221

}

207

/* unique case of first server */

222

/* Special case of first server */

208

223

if (mc.current_server == NULL){

209

224

new_server->next = new_server;

210

225

new_server->prev = new_server;

211

226

mc.current_server = new_server;

212

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

227

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

213

228

} else {

214

229

new_server->next = mc.current_server;

215

230

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

219

234

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

220

235

if(ret == -1){

221

236

perror_plus("clock_gettime");

222

return -1;

237

return false;

223

238

}

224

return 0;

239

return true;

225

240

}

226

241

227

242

/*

228

243

* Initialize GPGME.

229

244

*/

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

245

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

246

const char *tempdir){

232

247

gpgme_error_t rc;

233

248

gpgme_engine_info_t engine_info;

234

249

264

250

265

rc = gpgme_data_new_from_fd(&pgp_data, fd);

251

266

if(rc != GPG_ERR_NO_ERROR){

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

267

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

268

gpgme_strsource(rc), gpgme_strerror(rc));

254

269

return false;

255

270

}

256

271

257

272

rc = gpgme_op_import(mc.ctx, pgp_data);

258

273

if(rc != GPG_ERR_NO_ERROR){

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

274

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

275

gpgme_strsource(rc), gpgme_strerror(rc));

261

276

return false;

262

277

}

263

278

270

285

}

271

286

272

287

if(debug){

273

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

288

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

274

289

}

275

290

276

291

/* Init GPGME */

277

292

gpgme_check_version(NULL);

278

293

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

279

294

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

295

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

296

gpgme_strsource(rc), gpgme_strerror(rc));

282

297

return false;

283

298

}

284

299

285

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

300

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

286

301

rc = gpgme_get_engine_info(&engine_info);

287

302

if(rc != GPG_ERR_NO_ERROR){

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

290

305

return false;

291

306

}

292

307

while(engine_info != NULL){

298

313

engine_info = engine_info->next;

299

314

}

300

315

if(engine_info == NULL){

301

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

316

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

317

tempdir);

302

318

return false;

303

319

}

304

320

305

321

/* Create new GPGME "context" */

306

322

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

307

323

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

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

326

gpgme_strerror(rc));

310

327

return false;

311

328

}

312

329

331

348

ssize_t plaintext_length = 0;

332

349

333

350

if(debug){

334

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

351

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

335

352

}

336

353

337

354

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

338

355

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

356

0);

340

357

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

358

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

359

gpgme_strsource(rc), gpgme_strerror(rc));

343

360

return -1;

344

361

}

345

362

346

363

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

347

364

rc = gpgme_data_new(&dh_plain);

348

365

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

366

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

367

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

368

gpgme_strsource(rc), gpgme_strerror(rc));

351

369

gpgme_data_release(dh_crypto);

352

370

return -1;

353

371

}

356

374

data buffer */

357

375

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

358

376

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

361

379

plaintext_length = -1;

362

380

if(debug){

363

381

gpgme_decrypt_result_t result;

364

382

result = gpgme_op_decrypt_result(mc.ctx);

365

383

if(result == NULL){

366

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

384

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

367

385

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

386

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

387

result->unsupported_algorithm);

388

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

389

result->wrong_key_usage);

372

390

if(result->file_name != NULL){

373

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

391

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

374

392

}

375

393

gpgme_recipient_t recipient;

376

394

recipient = result->recipients;

377

395

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

396

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

397

gpgme_pubkey_algo_name

398

(recipient->pubkey_algo));

399

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

400

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

401

recipient->status == GPG_ERR_NO_SECKEY

402

? "No" : "Yes");

384

403

recipient = recipient->next;

385

404

}

386

405

}

389

408

}

390

409

391

410

if(debug){

392

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

411

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

393

412

}

394

413

395

414

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

402

421

*plaintext = NULL;

403

422

while(true){

404

423

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

424

(size_t)plaintext_length,

425

plaintext_capacity);

407

426

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

427

perror_plus("incbuffer");

428

plaintext_length = -1;

429

goto decrypt_end;

411

430

}

412

431

413

432

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

445

}

427

446

428

447

if(debug){

429

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

448

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

430

449

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

431

450

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

432

451

}

454

473

/* GnuTLS log function callback */

455

474

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

456

475

const char* string){

457

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

476

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

458

477

}

459

478

460

479

static int init_gnutls_global(const char *pubkeyfilename,

462

481

int ret;

463

482

464

483

if(debug){

465

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

484

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

466

485

}

467

486

468

487

ret = gnutls_global_init();

469

488

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

472

491

return -1;

473

492

}

474

493

483

502

/* OpenPGP credentials */

484

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

485

504

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

505

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

506

safer_gnutls_strerror(ret));

488

507

gnutls_global_deinit();

489

508

return -1;

490

509

}

491

510

492

511

if(debug){

493

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

494

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

495

seckeyfilename);

512

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

513

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

514

pubkeyfilename,

515

seckeyfilename);

496

516

}

497

517

498

518

ret = gnutls_certificate_set_openpgp_key_file

499

519

(mc.cred, pubkeyfilename, seckeyfilename,

500

520

GNUTLS_OPENPGP_FMT_BASE64);

501

521

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

522

fprintf_plus(stderr,

523

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

524

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

525

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

526

safer_gnutls_strerror(ret));

507

527

goto globalfail;

508

528

}

509

529

510

530

/* GnuTLS server initialization */

511

531

ret = gnutls_dh_params_init(&mc.dh_params);

512

532

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

" initialization: %s\n",

535

safer_gnutls_strerror(ret));

515

536

goto globalfail;

516

537

}

517

538

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

518

539

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

540

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

541

safer_gnutls_strerror(ret));

521

542

goto globalfail;

522

543

}

523

544

543

564

}

544

565

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

545

566

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

567

fprintf_plus(stderr,

568

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

569

safer_gnutls_strerror(ret));

548

570

}

549

571

550

572

{

557

579

}

558

580

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

559

581

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

582

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

583

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

584

safer_gnutls_strerror(ret));

563

585

gnutls_deinit(*session);

564

586

return -1;

565

587

}

574

596

}

575

597

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

576

598

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

599

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

600

safer_gnutls_strerror(ret));

579

601

gnutls_deinit(*session);

580

602

return -1;

581

603

}

626

648

pf = PF_INET;

627

649

break;

628

650

default:

629

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

651

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

630

652

errno = EINVAL;

631

653

return -1;

632

654

}

637

659

}

638

660

639

661

if(debug){

640

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

641

"\n", ip, port);

662

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

663

PRIu16 "\n", ip, port);

642

664

}

643

665

644

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

692

}

671

693

if(ret == 0){

672

694

int e = errno;

673

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

695

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

674

696

errno = e;

675

697

goto mandos_end;

676

698

}

681

703

682

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

705

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

684

-Wunreachable-code*/

706

-Wunreachable-code*/

685

707

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

708

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

709

" incomplete without a network interface\n");

688

710

errno = EINVAL;

689

711

goto mandos_end;

690

712

}

708

730

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

709

731

perror_plus("if_indextoname");

710

732

} else {

711

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

712

ip, interface, port);

733

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

734

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

713

735

}

714

736

} else {

715

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

716

port);

737

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

738

ip, port);

717

739

}

718

740

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

741

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

751

perror_plus("inet_ntop");

730

752

} else {

731

753

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

732

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

754

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

733

755

}

734

756

}

735

757

}

763

785

while(true){

764

786

size_t out_size = strlen(out);

765

787

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

766

out_size - written));

788

out_size - written));

767

789

if(ret == -1){

768

790

int e = errno;

769

791

perror_plus("write");

789

811

}

790

812

791

813

if(debug){

792

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

814

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

793

815

}

794

816

795

817

if(quit_now){

815

837

816

838

if(ret != GNUTLS_E_SUCCESS){

817

839

if(debug){

818

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

840

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

819

841

gnutls_perror(ret);

820

842

}

821

843

errno = EPROTO;

825

847

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

826

848

827

849

if(debug){

828

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

829

ip);

850

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

851

" %s\n", ip);

830

852

}

831

853

832

854

while(true){

837

859

}

838

860

839

861

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

862

buffer_capacity);

841

863

if(buffer_capacity == 0){

842

864

int e = errno;

843

865

perror_plus("incbuffer");

870

892

}

871

893

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

872

894

if(ret < 0){

873

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

895

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

896

"***\n");

874

897

gnutls_perror(ret);

875

898

errno = EPROTO;

876

899

goto mandos_end;

877

900

}

878

901

break;

879

902

default:

880

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

881

" encrypted session with Mandos server\n");

903

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

904

" encrypted session with Mandos server\n");

882

905

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

906

errno = EIO;

884

907

goto mandos_end;

889

912

}

890

913

891

914

if(debug){

892

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

915

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

893

916

}

894

917

895

918

if(quit_now){

907

930

908

931

if(buffer_length > 0){

909

932

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

934

&decrypted_buffer);

913

935

if(decrypted_buffer_size >= 0){

914

936

925

947

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

926

948

int e = errno;

927

949

if(debug){

928

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

929

strerror(errno));

950

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

951

strerror(errno));

930

952

}

931

953

errno = e;

932

954

goto mandos_end;

989

1011

switch(event){

990

1012

default:

991

1013

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1014

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

1015

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

1016

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

995

1018

break;

996

1019

997

1020

case AVAHI_RESOLVER_FOUND:

999

1022

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1023

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

1001

1024

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1025

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

1026

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

1027

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

1005

1028

}

1006

1029

int ret = start_mandos_communication(ip, port, interface,

1007

1030

avahi_proto_to_af(proto));

1008

1031

if(ret == 0){

1009

1032

avahi_simple_poll_quit(mc.simple_poll);

1010

1033

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1036

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1037

" list\n", name);

1038

}

1013

1039

}

1014

1040

}

1015

1041

}

1039

1065

default:

1040

1066

case AVAHI_BROWSER_FAILURE:

1041

1067

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1068

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

1044

1070

avahi_simple_poll_quit(mc.simple_poll);

1045

1071

return;

1046

1072

1053

1079

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

1054

1080

name, type, domain, protocol, 0,

1055

1081

resolve_callback, NULL) == NULL)

1056

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

1057

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

1082

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

1083

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

1058

1085

break;

1059

1086

1060

1087

case AVAHI_BROWSER_REMOVE:

1063

1090

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1091

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1092

if(debug){

1066

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

1093

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

1094

" searching...\n");

1067

1095

}

1068

1096

break;

1069

1097

}

1084

1112

errno = old_errno;

1085

1113

}

1086

1114

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 = 2+(sizeof(ifreq_flags)*2)+1; /* "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){

1115

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

1116

int ret;

1117

1118

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

1119

if(s < 0){

1120

perror_plus("socket");

1121

return false;

1122

}

1123

strcpy(ifr->ifr_name, ifname);

1124

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

if(ret == -1){

1143

1126

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1127

perror_plus("ioctl SIOCGIFFLAGS");

1146

1128

}

1147

free(flagstring);

1148

return 0;

1129

return false;

1149

1130

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

return true;

1132

}

1133

1134

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

1135

1152

1136

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1137

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1138

if(debug){

1155

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

1156

if_entry->d_name);

1139

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

1140

ifname);

1157

1141

}

1158

return 0;

1142

return false;

1159

1143

}

1160

1144

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

1161

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

1145

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

1162

1146

if(debug){

1163

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

1164

if_entry->d_name);

1147

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

1148

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

1165

1149

}

1166

return 1;

1150

return true;

1167

1151

}

1168

1152

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

1169

if(not (flags & IFF_BROADCAST)){

1153

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

1170

1154

if(debug){

1171

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

1172

if_entry->d_name);

1155

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1156

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

1173

1157

}

1174

return 0;

1158

return false;

1175

1159

}

1176

1160

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

1177

if(flags & IFF_NOARP){

1161

if(ifr->ifr_flags & IFF_NOARP){

1178

1162

if(debug){

1179

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

1180

if_entry->d_name);

1163

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

1164

ifname);

1181

1165

}

1182

return 0;

1166

return false;

1183

1167

}

1168

1184

1169

/* Accept this device */

1185

1170

if(debug){

1186

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

1187

if_entry->d_name);

1171

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

1172

}

1173

return true;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device.

1179

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

1180

*/

1181

int good_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

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

1191

}

1192

return 0;

1193

}

1194

1195

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

1196

return 0;

1197

}

1198

return 1;

1199

}

1200

1201

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1188

1240

}

1189

1241

return 1;

1190

1242

}

1200

1252

return 1;

1201

1253

}

1202

1254

1255

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

1256

int runnable_hook(const struct dirent *direntry){

1257

int ret;

1258

size_t sret;

1259

struct stat st;

1260

1261

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

1262

/* Empty name? */

1263

return 0;

1264

}

1265

1266

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

1267

"abcdefghijklmnopqrstuvwxyz"

1268

"0123456789"

1269

"_-");

1270

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

1271

/* Contains non-allowed characters */

1272

if(debug){

1273

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

1274

direntry->d_name);

1275

}

1276

return 0;

1277

}

1278

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1287

if(ret == -1){

1288

if(debug){

1289

perror_plus("Could not stat hook");

1290

}

1291

return 0;

1292

}

1293

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

1294

/* Not a regular file */

1295

if(debug){

1296

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

1297

direntry->d_name);

1298

}

1299

return 0;

1300

}

1301

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

1302

/* Not executable */

1303

if(debug){

1304

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

1305

direntry->d_name);

1306

}

1307

return 0;

1308

}

1309

if(debug){

1310

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

1311

direntry->d_name);

1312

}

1313

return 1;

1314

}

1315

1203

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1317

int ret;

1205

1318

struct timespec now;

1206

1319

struct timespec waited_time;

1207

1320

intmax_t block_time;

1208

1321

1209

1322

while(true){

1210

1323

if(mc.current_server == NULL){

1211

1324

if (debug){

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1325

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

1326

" No timeout!\n");

1214

1327

}

1215

1328

ret = avahi_simple_poll_iterate(s, -1);

1216

1329

} else {

1217

1330

if (debug){

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1331

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

1332

" it, or wait\n");

1220

1333

}

1221

1334

/* the current time */

1222

1335

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1236

1349

block_time = ((retry_interval

1237

1350

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

1238

1351

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

1239

1352

1240

1353

if (debug){

1241

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

1354

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

1355

block_time);

1242

1356

}

1243

1357

1244

1358

if(block_time <= 0){

1245

1359

ret = start_mandos_communication(mc.current_server->ip,

1246

1360

mc.current_server->port,

1264

1378

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

1265

1379

}

1266

1380

if(ret != 0){

1267

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

1381

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

1268

1382

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

1269

1383

}

1270

1384

}

1271

1385

}

1272

1386

}

1273

1387

1388

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

1389

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1395

if(numhooks == -1){

1396

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1404

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1473

free(delaystring);

1474

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1515

}

1516

1274

1517

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

1275

1518

AvahiSServiceBrowser *sb = NULL;

1276

1519

int error;

1358

1601

.arg = "SECONDS",

1359

1602

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

1360

1603

.group = 2 },

1604

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

1605

.arg = "DIR",

1606

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

1607

.group = 2 },

1361

1608

/*

1362

1609

* These reproduce what we would get without ARGP_NO_HELP

1363

1610

*/

1411

1658

errno = 0;

1412

1659

retry_interval = strtod(arg, &tmp);

1413

1660

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

1414

or (retry_interval * 1000) > INT_MAX){

1661

or (retry_interval * 1000) > INT_MAX

1662

or retry_interval < 0){

1415

1663

argp_error(state, "Bad retry interval");

1416

1664

}

1417

1665

break;

1666

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

1667

hookdir = arg;

1668

break;

1418

1669

/*

1419

1670

* These reproduce what we would get without ARGP_NO_HELP

1420

1671

*/

1426

1677

argp_state_help(state, state->out_stream,

1427

1678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

1679

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

1429

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

1680

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

1430

1681

exit(argp_err_exit_status);

1431

1682

break;

1432

1683

default:

1455

1706

goto end;

1456

1707

}

1457

1708

}

1709

1710

{

1711

/* Work around Debian bug #633582:

1712

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

1713

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

1719

} else {

1720

struct stat st;

1721

1722

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

1723

int seckey_fd = open(seckey, O_RDONLY);

1724

if(seckey_fd == -1){

1725

perror_plus("open");

1726

} else {

1727

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

1728

if(ret == -1){

1729

perror_plus("fstat");

1730

} else {

1731

if(S_ISREG(st.st_mode)

1732

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

1733

ret = fchown(seckey_fd, uid, gid);

1734

if(ret == -1){

1735

perror_plus("fchown");

1736

}

1737

}

1738

}

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

1740

}

1741

}

1742

1743

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

1744

int pubkey_fd = open(pubkey, O_RDONLY);

1745

if(pubkey_fd == -1){

1746

perror_plus("open");

1747

} else {

1748

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

1749

if(ret == -1){

1750

perror_plus("fstat");

1751

} else {

1752

if(S_ISREG(st.st_mode)

1753

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

1754

ret = fchown(pubkey_fd, uid, gid);

1755

if(ret == -1){

1756

perror_plus("fchown");

1757

}

1758

}

1759

}

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

1764

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

1769

}

1770

}

1771

}

1772

1773

/* Run network hooks */

1774

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

1775

goto end;

1776

}

1458

1777

1459

1778

if(not debug){

1460

1779

avahi_set_log_function(empty_log);

1461

1780

}

1462

1781

1463

1782

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

1464

1783

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1466

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1467

1793

if(ret >= 1){

1468

/* Pick the first good interface */

1794

/* Pick the first interface returned */

1469

1795

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

1470

1796

if(debug){

1471

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

1797

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

1472

1798

}

1473

1799

if(interface == NULL){

1474

1800

perror_plus("malloc");

1479

1805

free(direntries);

1480

1806

} else {

1481

1807

free(direntries);

1482

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

1808

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

1483

1809

exitcode = EXIT_FAILURE;

1484

1810

goto end;

1485

1811

}

1491

1817

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

1492

1818

mc.simple_poll = avahi_simple_poll_new();

1493

1819

if(mc.simple_poll == NULL){

1494

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

1820

fprintf_plus(stderr,

1821

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

1495

1822

exitcode = EX_UNAVAILABLE;

1496

1823

goto end;

1497

1824

}

1563

1890

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

1564

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

1892

if(if_index == 0){

1566

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

1893

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

1567

1894

exitcode = EX_UNAVAILABLE;

1568

1895

goto end;

1569

1896

}

1689

2016

#endif /* __linux__ */

1690

2017

/* Lower privileges */

1691

2018

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

1698

} else {

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

1704

2023

}

1705

2024

}

1706

2025

1710

2029

1711

2030

ret = init_gnutls_global(pubkey, seckey);

1712

2031

if(ret == -1){

1713

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

2032

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

1714

2033

exitcode = EX_UNAVAILABLE;

1715

2034

goto end;

1716

2035

} else {

1732

2051

}

1733

2052

1734

2053

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

1735

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

2054

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

1736

2055

exitcode = EX_UNAVAILABLE;

1737

2056

goto end;

1738

2057

} else {

1748

2067

/* (Mainly meant for debugging) */

1749

2068

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

1750

2069

if(address == NULL){

1751

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

2070

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

1752

2071

exitcode = EX_USAGE;

1753

2072

goto end;

1754

2073

}

1762

2081

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

1763

2082

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

1764

2083

or tmpmax != (uint16_t)tmpmax){

1765

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

2084

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

1766

2085

exitcode = EX_USAGE;

1767

2086

goto end;

1768

2087

}

1773

2092

1774

2093

port = (uint16_t)tmpmax;

1775

2094

*address = '\0';

1776

address = connect_to;

1777

2095

/* Colon in address indicates IPv6 */

1778

2096

int af;

1779

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

2097

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

1780

2098

af = AF_INET6;

2099

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

2100

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

2101

{

2102

connect_to++;

2103

address[-1] = '\0';

2104

}

1781

2105

} else {

1782

2106

af = AF_INET;

1783

2107

}

2108

address = connect_to;

1784

2109

1785

2110

if(quit_now){

1786

2111

goto end;

1787

2112

}

1788

2113

1789

2114

while(not quit_now){

1790

2115

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

1791

2116

if(quit_now or ret == 0){

1792

2117

break;

1793

2118

}

1794

sleep((int)retry_interval or 1);

1795

};

1796

2119

if(debug){

2120

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

2121

(int)retry_interval);

2122

}

2123

sleep((int)retry_interval);

2124

}

2125

1797

2126

if (not quit_now){

1798

2127

exitcode = EXIT_SUCCESS;

1799

2128

}

1800

2129

1801

2130

goto end;

1802

2131

}

1803

2132

1825

2154

1826

2155

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

1827

2156

if(mc.server == NULL){

1828

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

1829

avahi_strerror(error));

2157

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

2158

avahi_strerror(error));

1830

2159

exitcode = EX_UNAVAILABLE;

1831

2160

goto end;

1832

2161

}

1840

2169

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1841

2170

NULL, 0, browse_callback, NULL);

1842

2171

if(sb == NULL){

1843

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

1844

avahi_strerror(avahi_server_errno(mc.server)));

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

1845

2174

exitcode = EX_UNAVAILABLE;

1846

2175

goto end;

1847

2176

}

1853

2182

/* Run the main loop */

1854

2183

1855

2184

if(debug){

1856

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

2185

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

1857

2186

}

1858

2187

1859

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

2189

(int)(retry_interval * 1000));

1861

2190

if(debug){

1862

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

1863

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

2191

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

2192

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

1864

2193

}

1865

2194

1866

2195

end:

1867

2196

1868

2197

if(debug){

1869

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

2198

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

1870

2199

}

1871

2200

1872

2201

/* Cleanup things */

1888

2217

if(gpgme_initialized){

1889

2218

gpgme_release(mc.ctx);

1890

2219

}

1891

2220

1892

2221

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

1893

2222

has seen */

1894

2223

if(mc.current_server != NULL){

1900

2229

}

1901

2230

}

1902

2231

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2236

{

1906

2237

errno = 0;

1907

2238

ret = seteuid(0);

1908

2239

if(ret == -1){

1909

2240

perror_plus("seteuid");

1910

2241

}

1911

if(geteuid() == 0){

2242

2243

/* Take down the network interface */

2244

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

1912

2245

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

1913

2246

if(ret == -1){

1914

2247

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

2248

} else if(network.ifr_flags & IFF_UP){

1916

2249

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

1917

2250

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

1918

2251

if(ret == -1){

1923

2256

if(ret == -1){

1924

2257

perror_plus("close");

1925

2258

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

1932

2259

}

1933

2260

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

1934

2267

1935

2268

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

1936

2269

if(tempdir_created){

1937

2270

struct dirent **direntries = NULL;

1938

2271

struct dirent *direntry = NULL;

1939

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

1940

if (ret > 0){

1941

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

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

1942

2276

direntry = direntries[i];

1943

2277

char *fullname = NULL;

1944

2278

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

1949

2283

}

1950

2284

ret = remove(fullname);

1951

2285

if(ret == -1){

1952

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

1953

strerror(errno));

2286

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

2287

strerror(errno));

1954

2288

}

1955

2289

free(fullname);

1956

2290

}

1957

2291

}

1958

2292

1959

/* need to be cleaned even if ret == 0 because man page doesn't

1960

specify */

2293

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

1961

2294

free(direntries);

1962

if (ret == -1){

2295

if (numentries == -1){

1963

2296

perror_plus("scandir");

1964

2297

}

1965

2298

ret = rmdir(tempdir);