/mandos/trunk : revision 237.4.16

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() */

73

*/

74

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

75

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

76

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

76

setgid(), pause() */

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() */

91

88

92

89

#ifdef __linux__

93

90

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

111

108

init_gnutls_session(),

112

109

GNUTLS_* */

113

110

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

116

113

117

114

/* GPGME */

118

115

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

126

123

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

127

124

#define SECKEY "seckey.txt"

128

125

#define PUBKEY "pubkey.txt"

129

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

130

126

131

127

bool debug = false;

132

128

static const char mandos_protocol_version[] = "1";

133

129

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

134

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

130

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

135

131

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

136

132

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

133

139

134

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

140

135

typedef struct server{

175

170

perror(print_text);

176

171

}

177

172

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

188

173

/*

189

174

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

190

175

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

191

176

* "buffer_length" is how much is already used.

192

177

*/

193

178

size_t incbuffer(char **buffer, size_t buffer_length,

194

size_t buffer_capacity){

179

size_t buffer_capacity){

195

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

196

181

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

197

182

if(buffer == NULL){

202

187

return buffer_capacity;

203

188

}

204

189

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){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

208

193

int ret;

209

194

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

210

195

if(new_server == NULL){

211

196

perror_plus("malloc");

212

return false;

197

return -1;

213

198

}

214

199

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

215

.port = port,

216

.if_index = if_index,

217

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

218

203

if(new_server->ip == NULL){

219

204

perror_plus("strdup");

220

return false;

205

return -1;

221

206

}

222

/* Special case of first server */

207

/* unique case of first server */

223

208

if (mc.current_server == NULL){

224

209

new_server->next = new_server;

225

210

new_server->prev = new_server;

226

211

mc.current_server = new_server;

227

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

212

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

228

213

} else {

229

214

new_server->next = mc.current_server;

230

215

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

234

219

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

235

220

if(ret == -1){

236

221

perror_plus("clock_gettime");

237

return false;

222

return -1;

238

223

}

239

return true;

224

return 0;

240

225

}

241

226

242

227

/*

243

228

* Initialize GPGME.

244

229

*/

245

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

246

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

247

232

gpgme_error_t rc;

248

233

gpgme_engine_info_t engine_info;

249

234

264

249

265

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

266

251

if(rc != GPG_ERR_NO_ERROR){

267

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

268

gpgme_strsource(rc), gpgme_strerror(rc));

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

269

254

return false;

270

255

}

271

256

272

257

rc = gpgme_op_import(mc.ctx, pgp_data);

273

258

if(rc != GPG_ERR_NO_ERROR){

274

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

275

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

276

261

return false;

277

262

}

278

263

285

270

}

286

271

287

272

if(debug){

288

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

273

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

289

274

}

290

275

291

276

/* Init GPGME */

292

277

gpgme_check_version(NULL);

293

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

294

279

if(rc != GPG_ERR_NO_ERROR){

295

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

296

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

297

282

return false;

298

283

}

299

284

300

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

285

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

301

286

rc = gpgme_get_engine_info(&engine_info);

302

287

if(rc != GPG_ERR_NO_ERROR){

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

305

290

return false;

306

291

}

307

292

while(engine_info != NULL){

313

298

engine_info = engine_info->next;

314

299

}

315

300

if(engine_info == NULL){

316

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

317

tempdir);

301

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

318

302

return false;

319

303

}

320

304

321

305

/* Create new GPGME "context" */

322

306

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

323

307

if(rc != GPG_ERR_NO_ERROR){

324

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

325

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

326

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

327

310

return false;

328

311

}

329

312

348

331

ssize_t plaintext_length = 0;

349

332

350

333

if(debug){

351

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

334

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

352

335

}

353

336

354

337

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

355

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

356

339

0);

357

340

if(rc != GPG_ERR_NO_ERROR){

358

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

359

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

360

343

return -1;

361

344

}

362

345

363

346

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

364

347

rc = gpgme_data_new(&dh_plain);

365

348

if(rc != GPG_ERR_NO_ERROR){

366

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

367

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

368

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

369

351

gpgme_data_release(dh_crypto);

370

352

return -1;

371

353

}

374

356

data buffer */

375

357

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

376

358

if(rc != GPG_ERR_NO_ERROR){

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

379

361

plaintext_length = -1;

380

362

if(debug){

381

363

gpgme_decrypt_result_t result;

382

364

result = gpgme_op_decrypt_result(mc.ctx);

383

365

if(result == NULL){

384

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

366

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

385

367

} else {

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);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

390

372

if(result->file_name != NULL){

391

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

373

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

392

374

}

393

375

gpgme_recipient_t recipient;

394

376

recipient = result->recipients;

395

377

while(recipient != NULL){

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");

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");

403

384

recipient = recipient->next;

404

385

}

405

386

}

408

389

}

409

390

410

391

if(debug){

411

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

392

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

412

393

}

413

394

414

395

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

421

402

*plaintext = NULL;

422

403

while(true){

423

404

plaintext_capacity = incbuffer(plaintext,

424

(size_t)plaintext_length,

425

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

426

407

if(plaintext_capacity == 0){

427

perror_plus("incbuffer");

428

plaintext_length = -1;

429

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

430

411

}

431

412

432

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

445

426

}

446

427

447

428

if(debug){

448

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

429

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

449

430

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

450

431

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

451

432

}

473

454

/* GnuTLS log function callback */

474

455

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

475

456

const char* string){

476

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

457

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

477

458

}

478

459

479

460

static int init_gnutls_global(const char *pubkeyfilename,

481

462

int ret;

482

463

483

464

if(debug){

484

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

465

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

485

466

}

486

467

487

468

ret = gnutls_global_init();

488

469

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

491

472

return -1;

492

473

}

493

474

502

483

/* OpenPGP credentials */

503

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

504

485

if(ret != GNUTLS_E_SUCCESS){

505

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

506

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

507

488

gnutls_global_deinit();

508

489

return -1;

509

490

}

510

491

511

492

if(debug){

512

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

513

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

514

pubkeyfilename,

515

seckeyfilename);

493

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

494

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

495

seckeyfilename);

516

496

}

517

497

518

498

ret = gnutls_certificate_set_openpgp_key_file

519

499

(mc.cred, pubkeyfilename, seckeyfilename,

520

500

GNUTLS_OPENPGP_FMT_BASE64);

521

501

if(ret != GNUTLS_E_SUCCESS){

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));

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));

527

507

goto globalfail;

528

508

}

529

509

530

510

/* GnuTLS server initialization */

531

511

ret = gnutls_dh_params_init(&mc.dh_params);

532

512

if(ret != GNUTLS_E_SUCCESS){

533

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

" initialization: %s\n",

535

safer_gnutls_strerror(ret));

513

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

514

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

536

515

goto globalfail;

537

516

}

538

517

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

539

518

if(ret != GNUTLS_E_SUCCESS){

540

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

541

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

542

521

goto globalfail;

543

522

}

544

523

564

543

}

565

544

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

566

545

if(ret != GNUTLS_E_SUCCESS){

567

fprintf_plus(stderr,

568

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

569

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

570

548

}

571

549

572

550

{

579

557

}

580

558

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

581

559

if(ret != GNUTLS_E_SUCCESS){

582

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

583

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

584

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));

585

563

gnutls_deinit(*session);

586

564

return -1;

587

565

}

596

574

}

597

575

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

598

576

if(ret != GNUTLS_E_SUCCESS){

599

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

600

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

601

579

gnutls_deinit(*session);

602

580

return -1;

603

581

}

648

626

pf = PF_INET;

649

627

break;

650

628

default:

651

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

629

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

652

630

errno = EINVAL;

653

631

return -1;

654

632

}

659

637

}

660

638

661

639

if(debug){

662

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

663

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

664

642

}

665

643

666

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

692

670

}

693

671

if(ret == 0){

694

672

int e = errno;

695

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

673

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

696

674

errno = e;

697

675

goto mandos_end;

698

676

}

703

681

704

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

683

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

706

-Wunreachable-code*/

684

-Wunreachable-code*/

707

685

if(if_index == AVAHI_IF_UNSPEC){

708

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

709

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

710

688

errno = EINVAL;

711

689

goto mandos_end;

712

690

}

730

708

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

731

709

perror_plus("if_indextoname");

732

710

} else {

733

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

734

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

711

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

712

ip, interface, port);

735

713

}

736

714

} else {

737

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

738

ip, port);

715

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

716

port);

739

717

}

740

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

741

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

751

729

perror_plus("inet_ntop");

752

730

} else {

753

731

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

754

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

732

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

755

733

}

756

734

}

757

735

}

785

763

while(true){

786

764

size_t out_size = strlen(out);

787

765

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

788

out_size - written));

766

out_size - written));

789

767

if(ret == -1){

790

768

int e = errno;

791

769

perror_plus("write");

811

789

}

812

790

813

791

if(debug){

814

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

792

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

815

793

}

816

794

817

795

if(quit_now){

837

815

838

816

if(ret != GNUTLS_E_SUCCESS){

839

817

if(debug){

840

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

818

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

841

819

gnutls_perror(ret);

842

820

}

843

821

errno = EPROTO;

847

825

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

848

826

849

827

if(debug){

850

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

851

" %s\n", ip);

828

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

829

ip);

852

830

}

853

831

854

832

while(true){

859

837

}

860

838

861

839

buffer_capacity = incbuffer(&buffer, buffer_length,

862

buffer_capacity);

840

buffer_capacity);

863

841

if(buffer_capacity == 0){

864

842

int e = errno;

865

843

perror_plus("incbuffer");

892

870

}

893

871

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

894

872

if(ret < 0){

895

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

896

"***\n");

873

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

897

874

gnutls_perror(ret);

898

875

errno = EPROTO;

899

876

goto mandos_end;

900

877

}

901

878

break;

902

879

default:

903

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

904

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

905

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

906

883

errno = EIO;

907

884

goto mandos_end;

912

889

}

913

890

914

891

if(debug){

915

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

892

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

916

893

}

917

894

918

895

if(quit_now){

930

907

931

908

if(buffer_length > 0){

932

909

ssize_t decrypted_buffer_size;

933

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

934

912

&decrypted_buffer);

935

913

if(decrypted_buffer_size >= 0){

936

914

947

925

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

948

926

int e = errno;

949

927

if(debug){

950

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

951

strerror(errno));

928

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

929

strerror(errno));

952

930

}

953

931

errno = e;

954

932

goto mandos_end;

1011

989

switch(event){

1012

990

default:

1013

991

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1018

995

break;

1019

996

1020

997

case AVAHI_RESOLVER_FOUND:

1022

999

char ip[AVAHI_ADDRESS_STR_MAX];

1023

1000

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

1024

1001

if(debug){

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);

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);

1028

1005

}

1029

1006

int ret = start_mandos_communication(ip, port, interface,

1030

1007

avahi_proto_to_af(proto));

1031

1008

if(ret == 0){

1032

1009

avahi_simple_poll_quit(mc.simple_poll);

1033

1010

} else {

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

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1039

1013

}

1040

1014

}

1041

1015

}

1065

1039

default:

1066

1040

case AVAHI_BROWSER_FAILURE:

1067

1041

1068

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1070

1044

avahi_simple_poll_quit(mc.simple_poll);

1071

1045

return;

1072

1046

1079

1053

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

1080

1054

name, type, domain, protocol, 0,

1081

1055

resolve_callback, NULL) == NULL)

1082

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

1083

" %s\n", name,

1084

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)));

1085

1058

break;

1086

1059

1087

1060

case AVAHI_BROWSER_REMOVE:

1090

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1091

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1092

1065

if(debug){

1093

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

1094

" searching...\n");

1066

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

1095

1067

}

1096

1068

break;

1097

1069

}

1112

1084

errno = old_errno;

1113

1085

}

1114

1086

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){

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){

1126

1143

if(debug){

1127

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1128

1146

}

1129

return false;

1147

free(flagstring);

1148

return 0;

1130

1149

}

1131

return true;

1132

}

1133

1134

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

1135

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1136

1152

/* Reject the loopback device */

1137

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1138

1154

if(debug){

1139

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

1140

ifname);

1155

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

1156

if_entry->d_name);

1141

1157

}

1142

return false;

1158

return 0;

1143

1159

}

1144

1160

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

1145

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

1161

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

1146

1162

if(debug){

1147

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

1148

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

1163

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

1164

if_entry->d_name);

1149

1165

}

1150

return true;

1166

return 1;

1151

1167

}

1152

1168

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

1153

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

1169

if(not (flags & IFF_BROADCAST)){

1154

1170

if(debug){

1155

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1156

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

1171

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

1172

if_entry->d_name);

1157

1173

}

1158

return false;

1174

return 0;

1159

1175

}

1160

1176

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

1161

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1162

1178

if(debug){

1163

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

1164

ifname);

1179

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

1180

if_entry->d_name);

1165

1181

}

1166

return false;

1182

return 0;

1167

1183

}

1168

1169

1184

/* Accept this device */

1170

1185

if(debug){

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;

1186

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

1187

if_entry->d_name);

1240

1188

}

1241

1189

return 1;

1242

1190

}

1252

1200

return 1;

1253

1201

}

1254

1202

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

1316

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1317

1204

int ret;

1318

1205

struct timespec now;

1319

1206

struct timespec waited_time;

1320

1207

intmax_t block_time;

1321

1208

1322

1209

while(true){

1323

1210

if(mc.current_server == NULL){

1324

1211

if (debug){

1325

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

1326

" No timeout!\n");

1212

fprintf(stderr,

1213

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

1327

1214

}

1328

1215

ret = avahi_simple_poll_iterate(s, -1);

1329

1216

} else {

1330

1217

if (debug){

1331

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

1332

" it, or wait\n");

1218

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

1219

" or wait\n");

1333

1220

}

1334

1221

/* the current time */

1335

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1349

1236

block_time = ((retry_interval

1350

1237

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

1351

1238

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

1352

1239

1353

1240

if (debug){

1354

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

1355

block_time);

1241

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

1356

1242

}

1357

1243

1358

1244

if(block_time <= 0){

1359

1245

ret = start_mandos_communication(mc.current_server->ip,

1360

1246

mc.current_server->port,

1378

1264

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

1379

1265

}

1380

1266

if(ret != 0){

1381

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

1267

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

1382

1268

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

1383

1269

}

1384

1270

}

1385

1271

}

1386

1272

}

1387

1273

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

1517

1274

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

1518

1275

AvahiSServiceBrowser *sb = NULL;

1519

1276

int error;

1601

1358

.arg = "SECONDS",

1602

1359

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

1603

1360

.group = 2 },

1604

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

1605

.arg = "DIR",

1606

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

1607

.group = 2 },

1608

1361

/*

1609

1362

* These reproduce what we would get without ARGP_NO_HELP

1610

1363

*/

1658

1411

errno = 0;

1659

1412

retry_interval = strtod(arg, &tmp);

1660

1413

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

1661

or (retry_interval * 1000) > INT_MAX

1662

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1663

1415

argp_error(state, "Bad retry interval");

1664

1416

}

1665

1417

break;

1666

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

1667

hookdir = arg;

1668

break;

1669

1418

/*

1670

1419

* These reproduce what we would get without ARGP_NO_HELP

1671

1420

*/

1677

1426

argp_state_help(state, state->out_stream,

1678

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1679

1428

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

1680

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

1429

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

1681

1430

exit(argp_err_exit_status);

1682

1431

break;

1683

1432

default:

1710

1459

{

1711

1460

/* Work around Debian bug #633582:

1712

1461

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

1462

struct stat st;

1713

1463

1714

1464

/* Re-raise priviliges */

1715

1465

errno = 0;

1716

1466

ret = seteuid(0);

1717

1467

if(ret == -1){

1718

1468

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;

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

1776

1513

}

1777

1514

1778

1515

if(not debug){

1779

1516

avahi_set_log_function(empty_log);

1780

1517

}

1781

1518

1782

1519

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

1783

1520

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1786

1522

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

}

1793

1523

if(ret >= 1){

1794

/* Pick the first interface returned */

1524

/* Pick the first good interface */

1795

1525

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

1796

1526

if(debug){

1797

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

1527

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

1798

1528

}

1799

1529

if(interface == NULL){

1800

1530

perror_plus("malloc");

1805

1535

free(direntries);

1806

1536

} else {

1807

1537

free(direntries);

1808

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

1538

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

1809

1539

exitcode = EXIT_FAILURE;

1810

1540

goto end;

1811

1541

}

1817

1547

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

1818

1548

mc.simple_poll = avahi_simple_poll_new();

1819

1549

if(mc.simple_poll == NULL){

1820

fprintf_plus(stderr,

1821

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

1550

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

1822

1551

exitcode = EX_UNAVAILABLE;

1823

1552

goto end;

1824

1553

}

1890

1619

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

1891

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

1621

if(if_index == 0){

1893

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

1622

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

1894

1623

exitcode = EX_UNAVAILABLE;

1895

1624

goto end;

1896

1625

}

2016

1745

#endif /* __linux__ */

2017

1746

/* Lower privileges */

2018

1747

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

2023

1760

}

2024

1761

}

2025

1762

2029

1766

2030

1767

ret = init_gnutls_global(pubkey, seckey);

2031

1768

if(ret == -1){

2032

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

1769

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

2033

1770

exitcode = EX_UNAVAILABLE;

2034

1771

goto end;

2035

1772

} else {

2051

1788

}

2052

1789

2053

1790

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

2054

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

1791

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

2055

1792

exitcode = EX_UNAVAILABLE;

2056

1793

goto end;

2057

1794

} else {

2067

1804

/* (Mainly meant for debugging) */

2068

1805

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

2069

1806

if(address == NULL){

2070

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

1807

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

2071

1808

exitcode = EX_USAGE;

2072

1809

goto end;

2073

1810

}

2081

1818

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

2082

1819

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

2083

1820

or tmpmax != (uint16_t)tmpmax){

2084

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

1821

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

2085

1822

exitcode = EX_USAGE;

2086

1823

goto end;

2087

1824

}

2092

1829

2093

1830

port = (uint16_t)tmpmax;

2094

1831

*address = '\0';

1832

address = connect_to;

2095

1833

/* Colon in address indicates IPv6 */

2096

1834

int af;

2097

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

1835

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

2098

1836

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

}

2105

1837

} else {

2106

1838

af = AF_INET;

2107

1839

}

2108

address = connect_to;

2109

1840

2110

1841

if(quit_now){

2111

1842

goto end;

2112

1843

}

2113

1844

2114

1845

while(not quit_now){

2115

1846

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

2116

1847

if(quit_now or ret == 0){

2117

1848

break;

2118

1849

}

2119

if(debug){

2120

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

2121

(int)retry_interval);

2122

}

2123

sleep((int)retry_interval);

2124

}

2125

1850

sleep((int)retry_interval or 1);

1851

};

1852

2126

1853

if (not quit_now){

2127

1854

exitcode = EXIT_SUCCESS;

2128

1855

}

2129

1856

2130

1857

goto end;

2131

1858

}

2132

1859

2154

1881

2155

1882

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

2156

1883

if(mc.server == NULL){

2157

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

2158

avahi_strerror(error));

1884

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

1885

avahi_strerror(error));

2159

1886

exitcode = EX_UNAVAILABLE;

2160

1887

goto end;

2161

1888

}

2169

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2170

1897

NULL, 0, browse_callback, NULL);

2171

1898

if(sb == NULL){

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2174

1901

exitcode = EX_UNAVAILABLE;

2175

1902

goto end;

2176

1903

}

2182

1909

/* Run the main loop */

2183

1910

2184

1911

if(debug){

2185

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

1912

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

2186

1913

}

2187

1914

2188

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

1916

(int)(retry_interval * 1000));

2190

1917

if(debug){

2191

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

2192

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

1918

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

1919

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

2193

1920

}

2194

1921

2195

1922

end:

2196

1923

2197

1924

if(debug){

2198

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

1925

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

2199

1926

}

2200

1927

2201

1928

/* Cleanup things */

2217

1944

if(gpgme_initialized){

2218

1945

gpgme_release(mc.ctx);

2219

1946

}

2220

1947

2221

1948

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

2222

1949

has seen */

2223

1950

if(mc.current_server != NULL){

2229

1956

}

2230

1957

}

2231

1958

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2236

{

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

2237

1962

errno = 0;

2238

1963

ret = seteuid(0);

2239

1964

if(ret == -1){

2240

1965

perror_plus("seteuid");

2241

1966

}

2242

2243

/* Take down the network interface */

2244

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

1967

if(geteuid() == 0){

2245

1968

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

2246

1969

if(ret == -1){

2247

1970

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

1971

} else if(network.ifr_flags & IFF_UP) {

2249

1972

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

2250

1973

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

2251

1974

if(ret == -1){

2256

1979

if(ret == -1){

2257

1980

perror_plus("close");

2258

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

2259

1988

}

2260

1989

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2267

1990

2268

1991

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

2269

1992

if(tempdir_created){

2270

1993

struct dirent **direntries = NULL;

2271

1994

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

1995

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

1996

if (ret > 0){

1997

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

2276

1998

direntry = direntries[i];

2277

1999

char *fullname = NULL;

2278

2000

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

2283

2005

}

2284

2006

ret = remove(fullname);

2285

2007

if(ret == -1){

2286

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

2287

strerror(errno));

2008

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

2009

strerror(errno));

2288

2010

}

2289

2011

free(fullname);

2290

2012

}

2291

2013

}

2292

2014

2293

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

2015

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

2016

specify */

2294

2017

free(direntries);

2295

if (numentries == -1){

2018

if (ret == -1){

2296

2019

perror_plus("scandir");

2297

2020

}

2298

2021

ret = rmdir(tempdir);