/mandos/release : revision 237.16.5

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

132

148

133

149

/* Used for passing in values through the Avahi callback functions */

134

150

typedef struct {

139

155

gnutls_dh_params_t dh_params;

140

156

const char *priority;

141

157

gpgme_ctx_t ctx;

158

server *current_server;

142

159

} mandos_context;

143

160

144

161

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

145

162

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

146

163

.dh_bits = 1024, .priority = "SECURE256"

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

164

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

165

.current_server = NULL };

148

166

149

167

sig_atomic_t quit_now = 0;

150

168

int signal_received = 0;

151

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

152

177

/*

153

178

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

154

179

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

166

191

return buffer_capacity;

167

192

}

168

193

194

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

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

198

int ret;

199

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

200

if(new_server == NULL){

201

perror_plus("malloc");

202

return -1;

203

}

204

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

205

.port = port,

206

.if_index = if_index,

207

.af = af };

208

if(new_server->ip == NULL){

209

perror_plus("strdup");

210

return -1;

211

}

212

/* Special case of first server */

213

if (mc.current_server == NULL){

214

new_server->next = new_server;

215

new_server->prev = new_server;

216

mc.current_server = new_server;

217

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

218

} else {

219

new_server->next = mc.current_server;

220

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

221

new_server->prev->next = new_server;

222

mc.current_server->prev = new_server;

223

}

224

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

225

if(ret == -1){

226

perror_plus("clock_gettime");

227

return -1;

228

}

229

return 0;

230

}

231

169

232

/*

170

233

* Initialize GPGME.

171

234

*/

185

248

186

249

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

187

250

if(fd == -1){

188

perror("open");

251

perror_plus("open");

189

252

return false;

190

253

}

191

254

192

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

256

if(rc != GPG_ERR_NO_ERROR){

194

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

257

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

258

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

195

259

gpgme_strsource(rc), gpgme_strerror(rc));

196

260

return false;

197

261

}

198

262

199

263

rc = gpgme_op_import(mc.ctx, pgp_data);

200

264

if(rc != GPG_ERR_NO_ERROR){

201

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

265

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

266

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

202

267

gpgme_strsource(rc), gpgme_strerror(rc));

203

268

return false;

204

269

}

205

270

206

271

ret = (int)TEMP_FAILURE_RETRY(close(fd));

207

272

if(ret == -1){

208

perror("close");

273

perror_plus("close");

209

274

}

210

275

gpgme_data_release(pgp_data);

211

276

return true;

212

277

}

213

278

214

279

if(debug){

215

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

280

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

281

"Initializing GPGME\n");

216

282

}

217

283

218

284

/* Init GPGME */

219

285

gpgme_check_version(NULL);

220

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

287

if(rc != GPG_ERR_NO_ERROR){

222

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

288

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

289

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

223

290

gpgme_strsource(rc), gpgme_strerror(rc));

224

291

return false;

225

292

}

226

293

227

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

294

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

228

295

rc = gpgme_get_engine_info(&engine_info);

229

296

if(rc != GPG_ERR_NO_ERROR){

230

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

297

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

298

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

231

299

gpgme_strsource(rc), gpgme_strerror(rc));

232

300

return false;

233

301

}

240

308

engine_info = engine_info->next;

241

309

}

242

310

if(engine_info == NULL){

243

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

311

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

312

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

244

313

return false;

245

314

}

246

315

247

316

/* Create new GPGME "context" */

248

317

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

249

318

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

319

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

320

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

321

gpgme_strerror(rc));

252

322

return false;

253

323

}

254

324

273

343

ssize_t plaintext_length = 0;

274

344

275

345

if(debug){

276

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

346

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

347

"Trying to decrypt OpenPGP data\n");

277

348

}

278

349

279

350

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

280

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

352

0);

282

353

if(rc != GPG_ERR_NO_ERROR){

283

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

354

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

355

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

284

356

gpgme_strsource(rc), gpgme_strerror(rc));

285

357

return -1;

286

358

}

288

360

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

289

361

rc = gpgme_data_new(&dh_plain);

290

362

if(rc != GPG_ERR_NO_ERROR){

291

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

363

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

364

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

292

365

gpgme_strsource(rc), gpgme_strerror(rc));

293

366

gpgme_data_release(dh_crypto);

294

367

return -1;

298

371

data buffer */

299

372

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

300

373

if(rc != GPG_ERR_NO_ERROR){

301

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

374

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

375

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

302

376

gpgme_strsource(rc), gpgme_strerror(rc));

303

377

plaintext_length = -1;

304

378

if(debug){

305

379

gpgme_decrypt_result_t result;

306

380

result = gpgme_op_decrypt_result(mc.ctx);

307

381

if(result == NULL){

308

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

382

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

383

"gpgme_op_decrypt_result failed\n");

309

384

} else {

310

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

385

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

386

"Unsupported algorithm: %s\n",

311

387

result->unsupported_algorithm);

312

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

388

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

389

"Wrong key usage: %u\n",

313

390

result->wrong_key_usage);

314

391

if(result->file_name != NULL){

315

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

392

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

393

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

316

394

}

317

395

gpgme_recipient_t recipient;

318

396

recipient = result->recipients;

319

397

while(recipient != NULL){

320

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

398

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

399

"Public key algorithm: %s\n",

321

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

401

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

402

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

403

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

404

"Secret key available: %s\n",

324

405

recipient->status == GPG_ERR_NO_SECKEY

325

406

? "No" : "Yes");

326

407

recipient = recipient->next;

331

412

}

332

413

333

414

if(debug){

334

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

415

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

416

"Decryption of OpenPGP data succeeded\n");

335

417

}

336

418

337

419

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

338

420

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

421

perror_plus("gpgme_data_seek");

340

422

plaintext_length = -1;

341

423

goto decrypt_end;

342

424

}

347

429

(size_t)plaintext_length,

348

430

plaintext_capacity);

349

431

if(plaintext_capacity == 0){

350

perror("incbuffer");

432

perror_plus("incbuffer");

351

433

plaintext_length = -1;

352

434

goto decrypt_end;

353

435

}

360

442

break;

361

443

}

362

444

if(ret < 0){

363

perror("gpgme_data_read");

445

perror_plus("gpgme_data_read");

364

446

plaintext_length = -1;

365

447

goto decrypt_end;

366

448

}

368

450

}

369

451

370

452

if(debug){

371

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

453

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

454

"Decrypted password is: ");

372

455

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

373

456

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

374

457

}

396

479

/* GnuTLS log function callback */

397

480

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

398

481

const char* string){

399

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

482

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

400

483

}

401

484

402

485

static int init_gnutls_global(const char *pubkeyfilename,

404

487

int ret;

405

488

406

489

if(debug){

407

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

490

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

491

"Initializing GnuTLS\n");

408

492

}

409

493

410

494

ret = gnutls_global_init();

411

495

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

496

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

497

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

414

498

return -1;

415

499

}

416

500

423

507

}

424

508

425

509

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

511

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

512

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

513

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

433

514

gnutls_global_deinit();

434

515

return -1;

435

516

}

436

517

437

518

if(debug){

438

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

519

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

520

"Attempting to use OpenPGP public key %s and"

439

521

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

440

522

seckeyfilename);

441

523

}

445

527

GNUTLS_OPENPGP_FMT_BASE64);

446

528

if(ret != GNUTLS_E_SUCCESS){

447

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

448

531

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

449

532

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

450

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

451

safer_gnutls_strerror(ret));

533

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

534

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

452

535

goto globalfail;

453

536

}

454

537

455

538

/* GnuTLS server initialization */

456

539

ret = gnutls_dh_params_init(&mc.dh_params);

457

540

if(ret != GNUTLS_E_SUCCESS){

458

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

541

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

542

"Error in GnuTLS DH parameter initialization:"

459

543

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

460

544

goto globalfail;

461

545

}

462

546

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

463

547

if(ret != GNUTLS_E_SUCCESS){

464

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

548

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

549

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

465

550

safer_gnutls_strerror(ret));

466

551

goto globalfail;

467

552

}

488

573

}

489

574

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

490

575

if(ret != GNUTLS_E_SUCCESS){

491

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

576

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

577

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

492

578

safer_gnutls_strerror(ret));

493

579

}

494

580

502

588

}

503

589

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

504

590

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

591

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

592

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

593

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

594

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

508

595

gnutls_deinit(*session);

509

596

return -1;

510

597

}

519

606

}

520

607

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

521

608

if(ret != GNUTLS_E_SUCCESS){

522

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

609

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

610

"Error setting GnuTLS credentials: %s\n",

523

611

safer_gnutls_strerror(ret));

524

612

gnutls_deinit(*session);

525

613

return -1;

571

659

pf = PF_INET;

572

660

break;

573

661

default:

574

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

662

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

663

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

575

664

errno = EINVAL;

576

665

return -1;

577

666

}

582

671

}

583

672

584

673

if(debug){

585

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

674

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

675

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

586

676

"\n", ip, port);

587

677

}

588

678

589

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

680

if(tcp_sd < 0){

591

681

int e = errno;

592

perror("socket");

682

perror_plus("socket");

593

683

errno = e;

594

684

goto mandos_end;

595

685

}

609

699

}

610

700

if(ret < 0 ){

611

701

int e = errno;

612

perror("inet_pton");

702

perror_plus("inet_pton");

613

703

errno = e;

614

704

goto mandos_end;

615

705

}

616

706

if(ret == 0){

617

707

int e = errno;

618

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

708

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

709

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

619

710

errno = e;

620

711

goto mandos_end;

621

712

}

628

719

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

629

720

-Wunreachable-code*/

630

721

if(if_index == AVAHI_IF_UNSPEC){

631

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

722

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

723

"An IPv6 link-local address is incomplete"

632

724

" without a network interface\n");

633

725

errno = EINVAL;

634

726

goto mandos_end;

651

743

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

744

char interface[IF_NAMESIZE];

653

745

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

654

perror("if_indextoname");

746

perror_plus("if_indextoname");

655

747

} else {

656

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

748

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

749

"Connection to: %s%%%s, port %" PRIu16 "\n",

657

750

ip, interface, port);

658

751

}

659

752

} else {

660

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

661

port);

753

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

754

"Connection to: %s, port %" PRIu16 "\n", ip, port);

662

755

}

663

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

764

sizeof(addrstr));

672

765

}

673

766

if(pcret == NULL){

674

perror("inet_ntop");

767

perror_plus("inet_ntop");

675

768

} else {

676

769

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

677

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

770

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

771

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

678

772

}

679

773

}

680

774

}

692

786

if(ret < 0){

693

787

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

788

int e = errno;

695

perror("connect");

789

perror_plus("connect");

696

790

errno = e;

697

791

}

698

792

goto mandos_end;

711

805

out_size - written));

712

806

if(ret == -1){

713

807

int e = errno;

714

perror("write");

808

perror_plus("write");

715

809

errno = e;

716

810

goto mandos_end;

717

811

}

734

828

}

735

829

736

830

if(debug){

737

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

831

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

832

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

738

833

}

739

834

740

835

if(quit_now){

742

837

goto mandos_end;

743

838

}

744

839

840

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

745

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

842

747

843

if(quit_now){

759

855

760

856

if(ret != GNUTLS_E_SUCCESS){

761

857

if(debug){

762

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

858

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

859

"*** GnuTLS Handshake failed ***\n");

763

860

gnutls_perror(ret);

764

861

}

765

862

errno = EPROTO;

769

866

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

770

867

771

868

if(debug){

772

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

773

ip);

869

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

870

"Retrieving OpenPGP encrypted password from %s\n", ip);

774

871

}

775

872

776

873

while(true){

784

881

buffer_capacity);

785

882

if(buffer_capacity == 0){

786

883

int e = errno;

787

perror("incbuffer");

884

perror_plus("incbuffer");

788

885

errno = e;

789

886

goto mandos_end;

790

887

}

814

911

}

815

912

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

816

913

if(ret < 0){

817

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

914

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

915

"*** GnuTLS Re-handshake failed ***\n");

818

916

gnutls_perror(ret);

819

917

errno = EPROTO;

820

918

goto mandos_end;

821

919

}

822

920

break;

823

921

default:

824

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

922

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

923

"Unknown error while reading data from"

825

924

" encrypted session with Mandos server\n");

826

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

926

errno = EIO;

833

932

}

834

933

835

934

if(debug){

836

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

935

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

936

"Closing TLS session\n");

837

937

}

838

938

839

939

if(quit_now){

869

969

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

870

970

int e = errno;

871

971

if(debug){

872

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

972

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

973

"Error writing encrypted data: %s\n",

873

974

strerror(errno));

874

975

}

875

976

errno = e;

895

996

if(e == 0){

896

997

e = errno;

897

998

}

898

perror("close");

999

perror_plus("close");

899

1000

}

900

1001

gnutls_deinit(session);

1002

errno = e;

901

1003

if(quit_now){

902

e = EINTR;

1004

errno = EINTR;

903

1005

retval = -1;

904

1006

}

905

errno = e;

906

1007

}

907

1008

return retval;

908

1009

}

933

1034

switch(event){

934

1035

default:

935

1036

case AVAHI_RESOLVER_FAILURE:

936

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

1037

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

1038

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

937

1039

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

938

1040

avahi_strerror(avahi_server_errno(mc.server)));

939

1041

break;

943

1045

char ip[AVAHI_ADDRESS_STR_MAX];

944

1046

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

945

1047

if(debug){

946

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

1048

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

1049

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

947

1050

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

948

1051

ip, (intmax_t)interface, port);

949

1052

}

951

1054

avahi_proto_to_af(proto));

952

1055

if(ret == 0){

953

1056

avahi_simple_poll_quit(mc.simple_poll);

1057

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

954

1060

}

955

1061

}

956

1062

}

980

1086

default:

981

1087

case AVAHI_BROWSER_FAILURE:

982

1088

983

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

1089

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

1090

"(Avahi browser) %s\n",

984

1091

avahi_strerror(avahi_server_errno(mc.server)));

985

1092

avahi_simple_poll_quit(mc.simple_poll);

986

1093

return;

994

1101

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

995

1102

name, type, domain, protocol, 0,

996

1103

resolve_callback, NULL) == NULL)

997

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

1104

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

1105

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

998

1106

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

999

1107

break;

1000

1108

1004

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1114

if(debug){

1007

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

1115

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

1116

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

1008

1117

}

1009

1118

break;

1010

1119

}

1011

1120

}

1012

1121

1013

/* stop main loop after sigterm has been called */

1122

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

1014

1123

static void handle_sigterm(int sig){

1015

1124

if(quit_now){

1016

1125

return;

1018

1127

quit_now = 1;

1019

1128

signal_received = sig;

1020

1129

int old_errno = errno;

1130

/* set main loop to exit */

1021

1131

if(mc.simple_poll != NULL){

1022

1132

avahi_simple_poll_quit(mc.simple_poll);

1023

1133

}

1024

1134

errno = old_errno;

1025

1135

}

1026

1136

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1137

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

1138

int ret;

1139

1140

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

1141

if(s < 0){

1142

perror_plus("socket");

1143

return false;

1144

}

1145

strcpy(ifr->ifr_name, ifname);

1146

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1147

if(ret == -1){

1081

1148

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1149

perror_plus("ioctl SIOCGIFFLAGS");

1084

1150

}

1085

free(flagstring);

1086

return 0;

1151

return false;

1087

1152

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

return true;

1154

}

1155

1156

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

1157

1090

1158

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1160

if(debug){

1093

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

1094

if_entry->d_name);

1161

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

1162

"Rejecting loopback interface \"%s\"\n", ifname);

1095

1163

}

1096

return 0;

1164

return false;

1097

1165

}

1098

1166

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

1099

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

1167

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

1100

1168

if(debug){

1101

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

1102

if_entry->d_name);

1169

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

1170

"Accepting point-to-point interface \"%s\"\n", ifname);

1103

1171

}

1104

return 1;

1172

return true;

1105

1173

}

1106

1174

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1175

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

1176

if(debug){

1177

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

1178

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1179

}

1180

return false;

1181

}

1182

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

1183

if(ifr->ifr_flags & IFF_NOARP){

1184

if(debug){

1185

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

1186

"Rejecting non-ARP interface \"%s\"\n", ifname);

1187

}

1188

return false;

1189

}

1190

1114

1191

/* Accept this device */

1115

1192

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1193

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

1194

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

1195

}

1196

return true;

1197

}

1198

1199

/*

1200

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

1201

* corresponds to an acceptable network device.

1202

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

1203

*/

1204

int good_interface(const struct dirent *if_entry){

1205

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

1206

return 0;

1207

}

1208

1209

struct ifreq ifr;

1210

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

1211

if(debug){

1212

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

1213

"Failed to get flags for interface \"%s\"\n",

1214

if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

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

1220

return 0;

1221

}

1222

return 1;

1223

}

1224

1225

/*

1226

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

1227

* corresponds to an acceptable network device which is up.

1228

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

1229

*/

1230

int up_interface(const struct dirent *if_entry){

1231

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

1232

return 0;

1233

}

1234

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

"Failed to get flags for interface \"%s\"\n",

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

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

1247

if(debug){

1248

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

1249

"Rejecting down interface \"%s\"\n",

1250

if_entry->d_name);

1251

}

1252

return 0;

1253

}

1254

1255

/* Reject non-running interfaces */

1256

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

1257

if(debug){

1258

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

1259

"Rejecting non-running interface \"%s\"\n",

1260

if_entry->d_name);

1261

}

1262

return 0;

1263

}

1264

1265

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

1266

return 0;

1267

}

1268

return 1;

1269

}

1270

1271

int notdotentries(const struct dirent *direntry){

1272

/* Skip "." and ".." */

1273

if(direntry->d_name[0] == '.'

1274

and (direntry->d_name[1] == '\0'

1275

or (direntry->d_name[1] == '.'

1276

and direntry->d_name[2] == '\0'))){

1277

return 0;

1278

}

1279

return 1;

1280

}

1281

1282

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

1283

int runnable_hook(const struct dirent *direntry){

1284

int ret;

1285

struct stat st;

1286

1287

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

1288

/* Empty name? */

1289

return 0;

1290

}

1291

1292

/* Save pointer to last character */

1293

char *end = strchr(direntry->d_name, '\0')-1;

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

and (*end == '#')){

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1307

1308

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1311

if(ret < 0){

1312

perror_plus("asprintf");

1313

return 0;

1314

}

1315

1316

ret = stat(fullname, &st);

1317

if(ret == -1){

1318

if(debug){

1319

perror_plus("Could not stat plugin");

1320

}

1321

return 0;

1322

}

1323

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

1324

/* Not a regular file */

1325

return 0;

1326

}

1327

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

1328

/* Not executable */

1329

return 0;

1330

}

1331

return 1;

1332

}

1333

1334

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1335

int ret;

1336

struct timespec now;

1337

struct timespec waited_time;

1338

intmax_t block_time;

1339

1340

while(true){

1341

if(mc.current_server == NULL){

1342

if (debug){

1343

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

1344

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

1345

}

1346

ret = avahi_simple_poll_iterate(s, -1);

1347

} else {

1348

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1352

}

1353

/* the current time */

1354

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1355

if(ret == -1){

1356

perror_plus("clock_gettime");

1357

return -1;

1358

}

1359

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

1360

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

1361

waited_time.tv_sec = (now.tv_sec

1362

- mc.current_server->last_seen.tv_sec);

1363

waited_time.tv_nsec = (now.tv_nsec

1364

- mc.current_server->last_seen.tv_nsec);

1365

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

1366

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

1367

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

1368

block_time = ((retry_interval

1369

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

1370

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

1371

1372

if (debug){

1373

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

1374

"Blocking for %" PRIdMAX " ms\n", block_time);

1375

}

1376

1377

if(block_time <= 0){

1378

ret = start_mandos_communication(mc.current_server->ip,

1379

mc.current_server->port,

1380

mc.current_server->if_index,

1381

mc.current_server->af);

1382

if(ret == 0){

1383

avahi_simple_poll_quit(mc.simple_poll);

1384

return 0;

1385

}

1386

ret = clock_gettime(CLOCK_MONOTONIC,

1387

&mc.current_server->last_seen);

1388

if(ret == -1){

1389

perror_plus("clock_gettime");

1390

return -1;

1391

}

1392

mc.current_server = mc.current_server->next;

1393

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

1394

servers, but don't block */

1395

}

1396

1397

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

1398

}

1399

if(ret != 0){

1400

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

1401

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

1402

}

1403

}

1404

}

1120

1405

}

1121

1406

1122

1407

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

1141

1426

bool gnutls_initialized = false;

1142

1427

bool gpgme_initialized = false;

1143

1428

float delay = 2.5f;

1429

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

1430

retrying the same server again */

1144

1431

1145

1432

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1433

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1439

errno = 0;

1153

1440

ret = setgid(gid);

1154

1441

if(ret == -1){

1155

perror("setgid");

1442

perror_plus("setgid");

1156

1443

}

1157

1444

1158

1445

/* Lower user privileges (temporarily) */

1159

1446

errno = 0;

1160

1447

ret = seteuid(uid);

1161

1448

if(ret == -1){

1162

perror("seteuid");

1449

perror_plus("seteuid");

1163

1450

}

1164

1451

1165

1452

if(quit_now){

1200

1487

.arg = "SECONDS",

1201

1488

.doc = "Maximum delay to wait for interface startup",

1202

1489

.group = 2 },

1490

{ .name = "retry", .key = 132,

1491

.arg = "SECONDS",

1492

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

1493

.group = 2 },

1494

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

1495

.arg = "DIR",

1496

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

1497

.group = 2 },

1203

1498

/*

1204

1499

* These reproduce what we would get without ARGP_NO_HELP

1205

1500

*/

1249

1544

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

1250

1545

argp_error(state, "Bad delay");

1251

1546

}

1547

case 132: /* --retry */

1548

errno = 0;

1549

retry_interval = strtod(arg, &tmp);

1550

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

1551

or (retry_interval * 1000) > INT_MAX

1552

or retry_interval < 0){

1553

argp_error(state, "Bad retry interval");

1554

}

1555

break;

1556

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

1557

hookdir = arg;

1252

1558

break;

1253

1559

/*

1254

1560

* These reproduce what we would get without ARGP_NO_HELP

1261

1567

argp_state_help(state, state->out_stream,

1262

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1569

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

1570

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1264

1571

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

1265

1572

exit(argp_err_exit_status);

1266

1573

break;

1282

1589

case ENOMEM:

1283

1590

default:

1284

1591

errno = ret;

1285

perror("argp_parse");

1592

perror_plus("argp_parse");

1286

1593

exitcode = EX_OSERR;

1287

1594

goto end;

1288

1595

case EINVAL:

1290

1597

goto end;

1291

1598

}

1292

1599

}

1600

1601

{

1602

/* Work around Debian bug #633582:

1603

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

1604

struct stat st;

1605

1606

/* Re-raise priviliges */

1607

errno = 0;

1608

ret = seteuid(0);

1609

if(ret == -1){

1610

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

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

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

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

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

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

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

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

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

"Warning: network hook \"%s\" exited"

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

"Warning: network hook \"%s\" died by"

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

"Warning: network hook \"%s\" crashed\n",

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1752

}

1753

}

1293

1754

1294

1755

if(not debug){

1295

1756

avahi_set_log_function(empty_log);

1296

1757

}

1297

1758

1298

1759

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

1299

1760

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1763

alphasort);

1764

if(ret == 0){

1765

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

1766

free(direntries);

1767

ret = scandir(sys_class_net, &direntries, good_interface,

1768

alphasort);

1769

}

1302

1770

if(ret >= 1){

1303

/* Pick the first good interface */

1771

/* Pick the first interface returned */

1304

1772

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

1305

1773

if(debug){

1306

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

1774

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

1775

"Using interface \"%s\"\n", interface);

1307

1776

}

1308

1777

if(interface == NULL){

1309

perror("malloc");

1778

perror_plus("malloc");

1310

1779

free(direntries);

1311

1780

exitcode = EXIT_FAILURE;

1312

1781

goto end;

1314

1783

free(direntries);

1315

1784

} else {

1316

1785

free(direntries);

1317

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

1786

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

1787

"Could not find a network interface\n");

1318

1788

exitcode = EXIT_FAILURE;

1319

1789

goto end;

1320

1790

}

1326

1796

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

1327

1797

mc.simple_poll = avahi_simple_poll_new();

1328

1798

if(mc.simple_poll == NULL){

1329

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

1799

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

1800

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

1330

1801

exitcode = EX_UNAVAILABLE;

1331

1802

goto end;

1332

1803

}

1334

1805

sigemptyset(&sigterm_action.sa_mask);

1335

1806

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

1807

if(ret == -1){

1337

perror("sigaddset");

1808

perror_plus("sigaddset");

1338

1809

exitcode = EX_OSERR;

1339

1810

goto end;

1340

1811

}

1341

1812

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

1813

if(ret == -1){

1343

perror("sigaddset");

1814

perror_plus("sigaddset");

1344

1815

exitcode = EX_OSERR;

1345

1816

goto end;

1346

1817

}

1347

1818

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

1819

if(ret == -1){

1349

perror("sigaddset");

1820

perror_plus("sigaddset");

1350

1821

exitcode = EX_OSERR;

1351

1822

goto end;

1352

1823

}

1356

1827

*/

1357

1828

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

1829

if(ret == -1){

1359

perror("sigaction");

1830

perror_plus("sigaction");

1360

1831

return EX_OSERR;

1361

1832

}

1362

1833

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1834

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

1835

if(ret == -1){

1365

perror("sigaction");

1836

perror_plus("sigaction");

1366

1837

exitcode = EX_OSERR;

1367

1838

goto end;

1368

1839

}

1369

1840

}

1370

1841

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

1842

if(ret == -1){

1372

perror("sigaction");

1843

perror_plus("sigaction");

1373

1844

return EX_OSERR;

1374

1845

}

1375

1846

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1847

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

1848

if(ret == -1){

1378

perror("sigaction");

1849

perror_plus("sigaction");

1379

1850

exitcode = EX_OSERR;

1380

1851

goto end;

1381

1852

}

1382

1853

}

1383

1854

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

1855

if(ret == -1){

1385

perror("sigaction");

1856

perror_plus("sigaction");

1386

1857

return EX_OSERR;

1387

1858

}

1388

1859

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1860

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

1861

if(ret == -1){

1391

perror("sigaction");

1862

perror_plus("sigaction");

1392

1863

exitcode = EX_OSERR;

1393

1864

goto end;

1394

1865

}

1398

1869

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

1399

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1871

if(if_index == 0){

1401

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

1872

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

1873

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

1402

1874

exitcode = EX_UNAVAILABLE;

1403

1875

goto end;

1404

1876

}

1411

1883

errno = 0;

1412

1884

ret = seteuid(0);

1413

1885

if(ret == -1){

1414

perror("seteuid");

1886

perror_plus("seteuid");

1415

1887

}

1416

1888

1417

1889

#ifdef __linux__

1421

1893

bool restore_loglevel = true;

1422

1894

if(ret == -1){

1423

1895

restore_loglevel = false;

1424

perror("klogctl");

1896

perror_plus("klogctl");

1425

1897

}

1426

1898

#endif /* __linux__ */

1427

1899

1428

1900

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1901

if(sd < 0){

1430

perror("socket");

1902

perror_plus("socket");

1431

1903

exitcode = EX_OSERR;

1432

1904

#ifdef __linux__

1433

1905

if(restore_loglevel){

1434

1906

ret = klogctl(7, NULL, 0);

1435

1907

if(ret == -1){

1436

perror("klogctl");

1908

perror_plus("klogctl");

1437

1909

}

1438

1910

}

1439

1911

#endif /* __linux__ */

1441

1913

errno = 0;

1442

1914

ret = seteuid(uid);

1443

1915

if(ret == -1){

1444

perror("seteuid");

1916

perror_plus("seteuid");

1445

1917

}

1446

1918

goto end;

1447

1919

}

1448

1920

strcpy(network.ifr_name, interface);

1449

1921

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

1450

1922

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1923

perror_plus("ioctl SIOCGIFFLAGS");

1452

1924

#ifdef __linux__

1453

1925

if(restore_loglevel){

1454

1926

ret = klogctl(7, NULL, 0);

1455

1927

if(ret == -1){

1456

perror("klogctl");

1928

perror_plus("klogctl");

1457

1929

}

1458

1930

}

1459

1931

#endif /* __linux__ */

1462

1934

errno = 0;

1463

1935

ret = seteuid(uid);

1464

1936

if(ret == -1){

1465

perror("seteuid");

1937

perror_plus("seteuid");

1466

1938

}

1467

1939

goto end;

1468

1940

}

1472

1944

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

1473

1945

if(ret == -1){

1474

1946

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1947

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1948

exitcode = EX_OSERR;

1477

1949

#ifdef __linux__

1478

1950

if(restore_loglevel){

1479

1951

ret = klogctl(7, NULL, 0);

1480

1952

if(ret == -1){

1481

perror("klogctl");

1953

perror_plus("klogctl");

1482

1954

}

1483

1955

}

1484

1956

#endif /* __linux__ */

1486

1958

errno = 0;

1487

1959

ret = seteuid(uid);

1488

1960

if(ret == -1){

1489

perror("seteuid");

1961

perror_plus("seteuid");

1490

1962

}

1491

1963

goto end;

1492

1964

}

1493

1965

}

1494

/* sleep checking until interface is running */

1966

/* Sleep checking until interface is running.

1967

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

1495

1968

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

1496

1969

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

1497

1970

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1971

perror_plus("ioctl SIOCGIFFLAGS");

1499

1972

} else if(network.ifr_flags & IFF_RUNNING){

1500

1973

break;

1501

1974

}

1502

1975

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1976

ret = nanosleep(&sleeptime, NULL);

1504

1977

if(ret == -1 and errno != EINTR){

1505

perror("nanosleep");

1978

perror_plus("nanosleep");

1506

1979

}

1507

1980

}

1508

1981

if(not take_down_interface){

1509

1982

/* We won't need the socket anymore */

1510

1983

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1511

1984

if(ret == -1){

1512

perror("close");

1985

perror_plus("close");

1513

1986

}

1514

1987

}

1515

1988

#ifdef __linux__

1517

1990

/* Restores kernel loglevel to default */

1518

1991

ret = klogctl(7, NULL, 0);

1519

1992

if(ret == -1){

1520

perror("klogctl");

1993

perror_plus("klogctl");

1521

1994

}

1522

1995

}

1523

1996

#endif /* __linux__ */

1527

2000

/* Lower privileges */

1528

2001

ret = seteuid(uid);

1529

2002

if(ret == -1){

1530

perror("seteuid");

2003

perror_plus("seteuid");

1531

2004

}

1532

2005

} else {

1533

2006

/* Lower privileges permanently */

1534

2007

ret = setuid(uid);

1535

2008

if(ret == -1){

1536

perror("setuid");

2009

perror_plus("setuid");

1537

2010

}

1538

2011

}

1539

2012

}

1544

2017

1545

2018

ret = init_gnutls_global(pubkey, seckey);

1546

2019

if(ret == -1){

1547

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

2020

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

2021

"init_gnutls_global failed\n");

1548

2022

exitcode = EX_UNAVAILABLE;

1549

2023

goto end;

1550

2024

} else {

1555

2029

goto end;

1556

2030

}

1557

2031

2032

if(mkdtemp(tempdir) == NULL){

2033

perror_plus("mkdtemp");

2034

goto end;

2035

}

1558

2036

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2037

1565

2038

if(quit_now){

1566

2039

goto end;

1567

2040

}

1568

2041

1569

2042

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

1570

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

2043

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

2044

"init_gpgme failed\n");

1571

2045

exitcode = EX_UNAVAILABLE;

1572

2046

goto end;

1573

2047

} else {

1583

2057

/* (Mainly meant for debugging) */

1584

2058

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

1585

2059

if(address == NULL){

1586

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

2060

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

2061

"No colon in address\n");

1587

2062

exitcode = EX_USAGE;

1588

2063

goto end;

1589

2064

}

1597

2072

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

1598

2073

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

1599

2074

or tmpmax != (uint16_t)tmpmax){

1600

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

2075

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

2076

"Bad port number\n");

1601

2077

exitcode = EX_USAGE;

1602

2078

goto end;

1603

2079

}

1608

2084

1609

2085

port = (uint16_t)tmpmax;

1610

2086

*address = '\0';

1611

address = connect_to;

1612

2087

/* Colon in address indicates IPv6 */

1613

2088

int af;

1614

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

2089

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

1615

2090

af = AF_INET6;

2091

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

2092

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

2093

{

2094

connect_to++;

2095

address[-1] = '\0';

2096

}

1616

2097

} else {

1617

2098

af = AF_INET;

1618

2099

}

2100

address = connect_to;

1619

2101

1620

2102

if(quit_now){

1621

2103

goto end;

1622

2104

}

1623

2105

1624

2106

while(not quit_now){

1625

2107

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

1626

2108

if(quit_now or ret == 0){

1627

2109

break;

1628

2110

}

1629

sleep(15);

1630

};

1631

2111

if(debug){

2112

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

2113

"Retrying in %d seconds\n", (int)retry_interval);

2114

}

2115

sleep((int)retry_interval);

2116

}

2117

1632

2118

if (not quit_now){

1633

2119

exitcode = EXIT_SUCCESS;

1634

2120

}

1635

2121

1636

2122

goto end;

1637

2123

}

1638

2124

1660

2146

1661

2147

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

1662

2148

if(mc.server == NULL){

1663

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

2149

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

2150

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

1664

2151

avahi_strerror(error));

1665

2152

exitcode = EX_UNAVAILABLE;

1666

2153

goto end;

1675

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2163

NULL, 0, browse_callback, NULL);

1677

2164

if(sb == NULL){

1678

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

2165

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

2166

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

1679

2167

avahi_strerror(avahi_server_errno(mc.server)));

1680

2168

exitcode = EX_UNAVAILABLE;

1681

2169

goto end;

1688

2176

/* Run the main loop */

1689

2177

1690

2178

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2179

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

2180

"Starting Avahi loop search\n");

2181

}

2182

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

(int)(retry_interval * 1000));

2185

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2189

}

1695

2190

1696

2191

end:

1697

2192

1698

2193

if(debug){

1699

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

2194

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

2195

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

1700

2196

}

1701

2197

1702

2198

/* Cleanup things */

1718

2214

if(gpgme_initialized){

1719

2215

gpgme_release(mc.ctx);

1720

2216

}

2217

2218

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

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* XXX run network hooks "stop" here */

1721

2230

1722

2231

/* Take down the network interface */

1723

2232

if(take_down_interface){

1725

2234

errno = 0;

1726

2235

ret = seteuid(0);

1727

2236

if(ret == -1){

1728

perror("seteuid");

2237

perror_plus("seteuid");

1729

2238

}

1730

2239

if(geteuid() == 0){

1731

2240

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

1732

2241

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2242

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

1735

2244

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

1736

2245

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

1737

2246

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2247

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2248

}

1740

2249

}

1741

2250

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1742

2251

if(ret == -1){

1743

perror("close");

2252

perror_plus("close");

1744

2253

}

1745

2254

/* Lower privileges permanently */

1746

2255

errno = 0;

1747

2256

ret = setuid(uid);

1748

2257

if(ret == -1){

1749

perror("setuid");

2258

perror_plus("setuid");

1750

2259

}

1751

2260

}

1752

2261

}

1753

2262

1754

/* Removes the temp directory used by GPGME */

2263

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

1755

2264

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

/* Skip "." and ".." */

1770

if(direntry->d_name[0] == '.'

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

2265

struct dirent **direntries = NULL;

2266

struct dirent *direntry = NULL;

2267

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

2268

alphasort);

2269

if (numentries > 0){

2270

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

2271

direntry = direntries[i];

1776

2272

char *fullname = NULL;

1777

2273

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

1778

2274

direntry->d_name);

1779

2275

if(ret < 0){

1780

perror("asprintf");

2276

perror_plus("asprintf");

1781

2277

continue;

1782

2278

}

1783

2279

ret = remove(fullname);

1784

2280

if(ret == -1){

1785

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

1786

strerror(errno));

2281

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

2282

"remove(\"%s\"): %s\n", fullname, strerror(errno));

1787

2283

}

1788

2284

free(fullname);

1789

2285

}

1790

closedir(d);

2286

}

2287

2288

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

2289

free(direntries);

2290

if (numentries == -1){

2291

perror_plus("scandir");

1791

2292

}

1792

2293

ret = rmdir(tempdir);

1793

2294

if(ret == -1 and errno != ENOENT){

1794

perror("rmdir");

2295

perror_plus("rmdir");

1795

2296

}

1796

2297

}

1797

2298

1802

2303

&old_sigterm_action,

1803

2304

NULL));

1804

2305

if(ret == -1){

1805

perror("sigaction");

2306

perror_plus("sigaction");

1806

2307

}

1807

2308

do {

1808

2309

ret = raise(signal_received);

1809

2310

} while(ret != 0 and errno == EINTR);

1810

2311

if(ret != 0){

1811

perror("raise");

2312

perror_plus("raise");

1812

2313

abort();

1813

2314

}

1814

2315

TEMP_FAILURE_RETRY(pause());