/mandos/release : revision 237.16.3

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;

132

136

137

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

138

typedef struct server{

139

const char *ip;

140

uint16_t port;

141

AvahiIfIndex if_index;

142

int af;

143

struct timespec last_seen;

144

struct server *next;

145

struct server *prev;

146

} server;

147

133

148

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

134

149

typedef struct {

135

150

AvahiSimplePoll *simple_poll;

139

154

gnutls_dh_params_t dh_params;

140

155

const char *priority;

141

156

gpgme_ctx_t ctx;

157

server *current_server;

142

158

} mandos_context;

143

159

144

160

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

145

161

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

146

162

.dh_bits = 1024, .priority = "SECURE256"

147

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

163

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

164

.current_server = NULL };

148

165

149

166

sig_atomic_t quit_now = 0;

150

167

int signal_received = 0;

151

168

169

/* Function to use when printing errors */

170

void perror_plus(const char *print_text){

171

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

172

program_invocation_short_name);

173

perror(print_text);

174

}

175

152

176

/*

153

177

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

154

178

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

166

190

return buffer_capacity;

167

191

}

168

192

193

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

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

197

int ret;

198

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

199

if(new_server == NULL){

200

perror_plus("malloc");

201

return -1;

202

}

203

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

207

if(new_server->ip == NULL){

208

perror_plus("strdup");

209

return -1;

210

}

211

/* Special case of first server */

212

if (mc.current_server == NULL){

213

new_server->next = new_server;

214

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

217

} else {

218

new_server->next = mc.current_server;

219

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

220

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

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

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

229

}

230

169

231

/*

170

232

* Initialize GPGME.

171

233

*/

185

247

186

248

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

187

249

if(fd == -1){

188

perror("open");

250

perror_plus("open");

189

251

return false;

190

252

}

191

253

192

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

255

if(rc != GPG_ERR_NO_ERROR){

194

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

256

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

257

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

195

258

gpgme_strsource(rc), gpgme_strerror(rc));

196

259

return false;

197

260

}

198

261

199

262

rc = gpgme_op_import(mc.ctx, pgp_data);

200

263

if(rc != GPG_ERR_NO_ERROR){

201

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

264

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

265

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

202

266

gpgme_strsource(rc), gpgme_strerror(rc));

203

267

return false;

204

268

}

205

269

206

270

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

207

271

if(ret == -1){

208

perror("close");

272

perror_plus("close");

209

273

}

210

274

gpgme_data_release(pgp_data);

211

275

return true;

212

276

}

213

277

214

278

if(debug){

215

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

279

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

280

"Initializing GPGME\n");

216

281

}

217

282

218

283

/* Init GPGME */

219

284

gpgme_check_version(NULL);

220

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

286

if(rc != GPG_ERR_NO_ERROR){

222

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

287

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

288

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

223

289

gpgme_strsource(rc), gpgme_strerror(rc));

224

290

return false;

225

291

}

226

292

227

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

293

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

228

294

rc = gpgme_get_engine_info(&engine_info);

229

295

if(rc != GPG_ERR_NO_ERROR){

230

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

296

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

297

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

231

298

gpgme_strsource(rc), gpgme_strerror(rc));

232

299

return false;

233

300

}

240

307

engine_info = engine_info->next;

241

308

}

242

309

if(engine_info == NULL){

243

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

310

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

311

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

244

312

return false;

245

313

}

246

314

247

315

/* Create new GPGME "context" */

248

316

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

249

317

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

318

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

319

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

320

gpgme_strerror(rc));

252

321

return false;

253

322

}

254

323

273

342

ssize_t plaintext_length = 0;

274

343

275

344

if(debug){

276

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

345

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

346

"Trying to decrypt OpenPGP data\n");

277

347

}

278

348

279

349

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

280

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

351

0);

282

352

if(rc != GPG_ERR_NO_ERROR){

283

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

353

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

354

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

284

355

gpgme_strsource(rc), gpgme_strerror(rc));

285

356

return -1;

286

357

}

288

359

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

289

360

rc = gpgme_data_new(&dh_plain);

290

361

if(rc != GPG_ERR_NO_ERROR){

291

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

362

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

363

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

292

364

gpgme_strsource(rc), gpgme_strerror(rc));

293

365

gpgme_data_release(dh_crypto);

294

366

return -1;

298

370

data buffer */

299

371

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

300

372

if(rc != GPG_ERR_NO_ERROR){

301

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

373

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

374

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

302

375

gpgme_strsource(rc), gpgme_strerror(rc));

303

376

plaintext_length = -1;

304

377

if(debug){

305

378

gpgme_decrypt_result_t result;

306

379

result = gpgme_op_decrypt_result(mc.ctx);

307

380

if(result == NULL){

308

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

381

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

382

"gpgme_op_decrypt_result failed\n");

309

383

} else {

310

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

384

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

385

"Unsupported algorithm: %s\n",

311

386

result->unsupported_algorithm);

312

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

387

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

388

"Wrong key usage: %u\n",

313

389

result->wrong_key_usage);

314

390

if(result->file_name != NULL){

315

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

391

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

392

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

316

393

}

317

394

gpgme_recipient_t recipient;

318

395

recipient = result->recipients;

319

396

while(recipient != NULL){

320

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

397

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

398

"Public key algorithm: %s\n",

321

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

400

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

401

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

402

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

403

"Secret key available: %s\n",

324

404

recipient->status == GPG_ERR_NO_SECKEY

325

405

? "No" : "Yes");

326

406

recipient = recipient->next;

331

411

}

332

412

333

413

if(debug){

334

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

335

416

}

336

417

337

418

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

338

419

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

339

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

340

421

plaintext_length = -1;

341

422

goto decrypt_end;

342

423

}

347

428

(size_t)plaintext_length,

348

429

plaintext_capacity);

349

430

if(plaintext_capacity == 0){

350

perror("incbuffer");

431

perror_plus("incbuffer");

351

432

plaintext_length = -1;

352

433

goto decrypt_end;

353

434

}

360

441

break;

361

442

}

362

443

if(ret < 0){

363

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

364

445

plaintext_length = -1;

365

446

goto decrypt_end;

366

447

}

368

449

}

369

450

370

451

if(debug){

371

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

452

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

453

"Decrypted password is: ");

372

454

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

373

455

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

374

456

}

396

478

/* GnuTLS log function callback */

397

479

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

398

480

const char* string){

399

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

481

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

400

482

}

401

483

402

484

static int init_gnutls_global(const char *pubkeyfilename,

404

486

int ret;

405

487

406

488

if(debug){

407

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

489

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

490

"Initializing GnuTLS\n");

408

491

}

409

492

410

493

ret = gnutls_global_init();

411

494

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

495

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

496

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

414

497

return -1;

415

498

}

416

499

423

506

}

424

507

425

508

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

510

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));

511

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

512

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

433

513

gnutls_global_deinit();

434

514

return -1;

435

515

}

436

516

437

517

if(debug){

438

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

518

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

519

"Attempting to use OpenPGP public key %s and"

439

520

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

440

521

seckeyfilename);

441

522

}

445

526

GNUTLS_OPENPGP_FMT_BASE64);

446

527

if(ret != GNUTLS_E_SUCCESS){

447

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

448

530

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

449

531

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

450

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

451

safer_gnutls_strerror(ret));

532

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

533

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

452

534

goto globalfail;

453

535

}

454

536

455

537

/* GnuTLS server initialization */

456

538

ret = gnutls_dh_params_init(&mc.dh_params);

457

539

if(ret != GNUTLS_E_SUCCESS){

458

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

540

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

541

"Error in GnuTLS DH parameter initialization:"

459

542

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

460

543

goto globalfail;

461

544

}

462

545

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

463

546

if(ret != GNUTLS_E_SUCCESS){

464

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

547

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

548

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

465

549

safer_gnutls_strerror(ret));

466

550

goto globalfail;

467

551

}

488

572

}

489

573

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

490

574

if(ret != GNUTLS_E_SUCCESS){

491

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

575

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

576

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

492

577

safer_gnutls_strerror(ret));

493

578

}

494

579

502

587

}

503

588

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

504

589

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));

590

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

591

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

592

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

593

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

508

594

gnutls_deinit(*session);

509

595

return -1;

510

596

}

519

605

}

520

606

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

521

607

if(ret != GNUTLS_E_SUCCESS){

522

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

608

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

609

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

523

610

safer_gnutls_strerror(ret));

524

611

gnutls_deinit(*session);

525

612

return -1;

571

658

pf = PF_INET;

572

659

break;

573

660

default:

574

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

661

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

662

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

575

663

errno = EINVAL;

576

664

return -1;

577

665

}

582

670

}

583

671

584

672

if(debug){

585

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

673

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

674

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

586

675

"\n", ip, port);

587

676

}

588

677

589

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

679

if(tcp_sd < 0){

591

680

int e = errno;

592

perror("socket");

681

perror_plus("socket");

593

682

errno = e;

594

683

goto mandos_end;

595

684

}

609

698

}

610

699

if(ret < 0 ){

611

700

int e = errno;

612

perror("inet_pton");

701

perror_plus("inet_pton");

613

702

errno = e;

614

703

goto mandos_end;

615

704

}

616

705

if(ret == 0){

617

706

int e = errno;

618

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

707

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

708

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

619

709

errno = e;

620

710

goto mandos_end;

621

711

}

628

718

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

629

719

-Wunreachable-code*/

630

720

if(if_index == AVAHI_IF_UNSPEC){

631

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

721

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

722

"An IPv6 link-local address is incomplete"

632

723

" without a network interface\n");

633

724

errno = EINVAL;

634

725

goto mandos_end;

651

742

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

652

743

char interface[IF_NAMESIZE];

653

744

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

654

perror("if_indextoname");

745

perror_plus("if_indextoname");

655

746

} else {

656

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

747

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

748

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

657

749

ip, interface, port);

658

750

}

659

751

} else {

660

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

661

port);

752

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

753

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

662

754

}

663

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

763

sizeof(addrstr));

672

764

}

673

765

if(pcret == NULL){

674

perror("inet_ntop");

766

perror_plus("inet_ntop");

675

767

} else {

676

768

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

677

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

769

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

770

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

678

771

}

679

772

}

680

773

}

692

785

if(ret < 0){

693

786

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

694

787

int e = errno;

695

perror("connect");

788

perror_plus("connect");

696

789

errno = e;

697

790

}

698

791

goto mandos_end;

711

804

out_size - written));

712

805

if(ret == -1){

713

806

int e = errno;

714

perror("write");

807

perror_plus("write");

715

808

errno = e;

716

809

goto mandos_end;

717

810

}

734

827

}

735

828

736

829

if(debug){

737

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

830

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

831

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

738

832

}

739

833

740

834

if(quit_now){

742

836

goto mandos_end;

743

837

}

744

838

839

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

745

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

841

747

842

if(quit_now){

759

854

760

855

if(ret != GNUTLS_E_SUCCESS){

761

856

if(debug){

762

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

857

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

858

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

763

859

gnutls_perror(ret);

764

860

}

765

861

errno = EPROTO;

769

865

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

770

866

771

867

if(debug){

772

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

773

ip);

868

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

869

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

774

870

}

775

871

776

872

while(true){

784

880

buffer_capacity);

785

881

if(buffer_capacity == 0){

786

882

int e = errno;

787

perror("incbuffer");

883

perror_plus("incbuffer");

788

884

errno = e;

789

885

goto mandos_end;

790

886

}

814

910

}

815

911

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

816

912

if(ret < 0){

817

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

913

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

914

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

818

915

gnutls_perror(ret);

819

916

errno = EPROTO;

820

917

goto mandos_end;

821

918

}

822

919

break;

823

920

default:

824

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

921

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

922

"Unknown error while reading data from"

825

923

" encrypted session with Mandos server\n");

826

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

925

errno = EIO;

833

931

}

834

932

835

933

if(debug){

836

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

934

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

935

"Closing TLS session\n");

837

936

}

838

937

839

938

if(quit_now){

869

968

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

870

969

int e = errno;

871

970

if(debug){

872

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

971

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

972

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

873

973

strerror(errno));

874

974

}

875

975

errno = e;

895

995

if(e == 0){

896

996

e = errno;

897

997

}

898

perror("close");

998

perror_plus("close");

899

999

}

900

1000

gnutls_deinit(session);

1001

errno = e;

901

1002

if(quit_now){

902

e = EINTR;

1003

errno = EINTR;

903

1004

retval = -1;

904

1005

}

905

errno = e;

906

1006

}

907

1007

return retval;

908

1008

}

933

1033

switch(event){

934

1034

default:

935

1035

case AVAHI_RESOLVER_FAILURE:

936

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

1036

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

1037

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

937

1038

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

938

1039

avahi_strerror(avahi_server_errno(mc.server)));

939

1040

break;

943

1044

char ip[AVAHI_ADDRESS_STR_MAX];

944

1045

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

945

1046

if(debug){

946

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

1047

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

1048

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

947

1049

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

948

1050

ip, (intmax_t)interface, port);

949

1051

}

951

1053

avahi_proto_to_af(proto));

952

1054

if(ret == 0){

953

1055

avahi_simple_poll_quit(mc.simple_poll);

1056

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

954

1059

}

955

1060

}

956

1061

}

980

1085

default:

981

1086

case AVAHI_BROWSER_FAILURE:

982

1087

983

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

1088

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

1089

"(Avahi browser) %s\n",

984

1090

avahi_strerror(avahi_server_errno(mc.server)));

985

1091

avahi_simple_poll_quit(mc.simple_poll);

986

1092

return;

994

1100

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

995

1101

name, type, domain, protocol, 0,

996

1102

resolve_callback, NULL) == NULL)

997

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

1103

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

1104

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

998

1105

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

999

1106

break;

1000

1107

1004

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1113

if(debug){

1007

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

1114

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

1115

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

1008

1116

}

1009

1117

break;

1010

1118

}

1011

1119

}

1012

1120

1013

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

1121

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

1014

1122

static void handle_sigterm(int sig){

1015

1123

if(quit_now){

1016

1124

return;

1018

1126

quit_now = 1;

1019

1127

signal_received = sig;

1020

1128

int old_errno = errno;

1129

/* set main loop to exit */

1021

1130

if(mc.simple_poll != NULL){

1022

1131

avahi_simple_poll_quit(mc.simple_poll);

1023

1132

}

1024

1133

errno = old_errno;

1025

1134

}

1026

1135

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){

1136

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

1137

int ret;

1138

1139

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

1140

if(s < 0){

1141

perror_plus("socket");

1142

return false;

1143

}

1144

strcpy(ifr->ifr_name, ifname);

1145

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1146

if(ret == -1){

1081

1147

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1148

perror_plus("ioctl SIOCGIFFLAGS");

1084

1149

}

1085

free(flagstring);

1086

return 0;

1150

return false;

1087

1151

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

return true;

1153

}

1154

1155

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

1156

1090

1157

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1159

if(debug){

1093

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

1094

if_entry->d_name);

1160

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

1161

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

1095

1162

}

1096

return 0;

1163

return false;

1097

1164

}

1098

1165

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

1099

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

1166

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

1100

1167

if(debug){

1101

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

1102

if_entry->d_name);

1168

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

1169

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

1103

1170

}

1104

return 1;

1171

return true;

1105

1172

}

1106

1173

/* 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

}

1174

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

1175

if(debug){

1176

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

1177

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

1178

}

1179

return false;

1180

}

1181

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

1182

if(ifr->ifr_flags & IFF_NOARP){

1183

if(debug){

1184

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

1185

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

1186

}

1187

return false;

1188

}

1189

1114

1190

/* Accept this device */

1115

1191

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1192

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

1193

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

1194

}

1195

return true;

1196

}

1197

1198

/*

1199

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

1200

* corresponds to an acceptable network device.

1201

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

1202

*/

1203

int good_interface(const struct dirent *if_entry){

1204

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

1205

return 0;

1206

}

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

if_entry->d_name);

1214

}

1215

return 0;

1216

}

1217

1218

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

1219

return 0;

1220

}

1221

return 1;

1222

}

1223

1224

/*

1225

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

1226

* corresponds to an acceptable network device which is up.

1227

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

1228

*/

1229

int up_interface(const struct dirent *if_entry){

1230

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

1231

return 0;

1232

}

1233

1234

struct ifreq ifr;

1235

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

1236

if(debug){

1237

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

1238

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

1239

if_entry->d_name);

1240

}

1241

return 0;

1242

}

1243

1244

/* Reject down interfaces */

1245

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

1246

if(debug){

1247

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

1248

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

1249

if_entry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

/* Reject non-running interfaces */

1255

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

1256

if(debug){

1257

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

1258

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

1259

if_entry->d_name);

1260

}

1261

return 0;

1262

}

1263

1264

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

1265

return 0;

1266

}

1267

return 1;

1268

}

1269

1270

int notdotentries(const struct dirent *direntry){

1271

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

1272

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

1273

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

1274

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

1275

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

1276

return 0;

1277

}

1278

return 1;

1279

}

1280

1281

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

1282

int runnable_hook(const struct dirent *direntry){

1283

int ret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

/* Save pointer to last character */

1292

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

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

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

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

ret = stat(direntry->d_name, &st);

1308

if(ret == -1){

1309

if(debug){

1310

perror_plus("Could not stat plugin");

1311

}

1312

return 0;

1313

}

1314

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

1315

/* Not a regular file */

1316

return 0;

1317

}

1318

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

1319

/* Not executable */

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1326

int ret;

1327

struct timespec now;

1328

struct timespec waited_time;

1329

intmax_t block_time;

1330

1331

while(true){

1332

if(mc.current_server == NULL){

1333

if (debug){

1334

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

1335

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

1336

}

1337

ret = avahi_simple_poll_iterate(s, -1);

1338

} else {

1339

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1343

}

1344

/* the current time */

1345

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1346

if(ret == -1){

1347

perror_plus("clock_gettime");

1348

return -1;

1349

}

1350

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

1351

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

1352

waited_time.tv_sec = (now.tv_sec

1353

- mc.current_server->last_seen.tv_sec);

1354

waited_time.tv_nsec = (now.tv_nsec

1355

- mc.current_server->last_seen.tv_nsec);

1356

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

1357

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

1358

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

1359

block_time = ((retry_interval

1360

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

1361

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

1362

1363

if (debug){

1364

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

1365

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

1366

}

1367

1368

if(block_time <= 0){

1369

ret = start_mandos_communication(mc.current_server->ip,

1370

mc.current_server->port,

1371

mc.current_server->if_index,

1372

mc.current_server->af);

1373

if(ret == 0){

1374

avahi_simple_poll_quit(mc.simple_poll);

1375

return 0;

1376

}

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1378

&mc.current_server->last_seen);

1379

if(ret == -1){

1380

perror_plus("clock_gettime");

1381

return -1;

1382

}

1383

mc.current_server = mc.current_server->next;

1384

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

1385

servers, but don't block */

1386

}

1387

1388

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

1389

}

1390

if(ret != 0){

1391

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

1392

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

1393

}

1394

}

1395

}

1120

1396

}

1121

1397

1122

1398

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

1141

1417

bool gnutls_initialized = false;

1142

1418

bool gpgme_initialized = false;

1143

1419

float delay = 2.5f;

1420

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

1421

retrying the same server again */

1144

1422

1145

1423

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1424

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1430

errno = 0;

1153

1431

ret = setgid(gid);

1154

1432

if(ret == -1){

1155

perror("setgid");

1433

perror_plus("setgid");

1156

1434

}

1157

1435

1158

1436

/* Lower user privileges (temporarily) */

1159

1437

errno = 0;

1160

1438

ret = seteuid(uid);

1161

1439

if(ret == -1){

1162

perror("seteuid");

1440

perror_plus("seteuid");

1163

1441

}

1164

1442

1165

1443

if(quit_now){

1200

1478

.arg = "SECONDS",

1201

1479

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

1202

1480

.group = 2 },

1481

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

1482

.arg = "SECONDS",

1483

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

1484

.group = 2 },

1203

1485

/*

1204

1486

* These reproduce what we would get without ARGP_NO_HELP

1205

1487

*/

1249

1531

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

1250

1532

argp_error(state, "Bad delay");

1251

1533

}

1534

case 132: /* --retry */

1535

errno = 0;

1536

retry_interval = strtod(arg, &tmp);

1537

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

1538

or (retry_interval * 1000) > INT_MAX

1539

or retry_interval < 0){

1540

argp_error(state, "Bad retry interval");

1541

}

1252

1542

break;

1253

1543

/*

1254

1544

* These reproduce what we would get without ARGP_NO_HELP

1261

1551

argp_state_help(state, state->out_stream,

1262

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1553

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

1554

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

1264

1555

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

1265

1556

exit(argp_err_exit_status);

1266

1557

break;

1282

1573

case ENOMEM:

1283

1574

default:

1284

1575

errno = ret;

1285

perror("argp_parse");

1576

perror_plus("argp_parse");

1286

1577

exitcode = EX_OSERR;

1287

1578

goto end;

1288

1579

case EINVAL:

1290

1581

goto end;

1291

1582

}

1292

1583

}

1584

1585

{

1586

/* Work around Debian bug #633582:

1587

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

1588

struct stat st;

1589

1590

/* Re-raise priviliges */

1591

errno = 0;

1592

ret = seteuid(0);

1593

if(ret == -1){

1594

perror_plus("seteuid");

1595

}

1596

1597

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

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

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

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

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

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

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

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

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

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

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

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

} else {

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

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

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

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

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

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

1711

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

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1719

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

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

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

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1737

}

1738

}

1293

1739

1294

1740

if(not debug){

1295

1741

avahi_set_log_function(empty_log);

1296

1742

}

1297

1743

1298

1744

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

1299

1745

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1748

alphasort);

1749

if(ret == 0){

1750

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

1751

free(direntries);

1752

ret = scandir(sys_class_net, &direntries, good_interface,

1753

alphasort);

1754

}

1302

1755

if(ret >= 1){

1303

/* Pick the first good interface */

1756

/* Pick the first interface returned */

1304

1757

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

1305

1758

if(debug){

1306

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

1759

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

1760

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

1307

1761

}

1308

1762

if(interface == NULL){

1309

perror("malloc");

1763

perror_plus("malloc");

1310

1764

free(direntries);

1311

1765

exitcode = EXIT_FAILURE;

1312

1766

goto end;

1314

1768

free(direntries);

1315

1769

} else {

1316

1770

free(direntries);

1317

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

1771

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

1772

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

1318

1773

exitcode = EXIT_FAILURE;

1319

1774

goto end;

1320

1775

}

1326

1781

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

1327

1782

mc.simple_poll = avahi_simple_poll_new();

1328

1783

if(mc.simple_poll == NULL){

1329

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

1784

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

1785

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

1330

1786

exitcode = EX_UNAVAILABLE;

1331

1787

goto end;

1332

1788

}

1334

1790

sigemptyset(&sigterm_action.sa_mask);

1335

1791

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

1336

1792

if(ret == -1){

1337

perror("sigaddset");

1793

perror_plus("sigaddset");

1338

1794

exitcode = EX_OSERR;

1339

1795

goto end;

1340

1796

}

1341

1797

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

1342

1798

if(ret == -1){

1343

perror("sigaddset");

1799

perror_plus("sigaddset");

1344

1800

exitcode = EX_OSERR;

1345

1801

goto end;

1346

1802

}

1347

1803

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

1348

1804

if(ret == -1){

1349

perror("sigaddset");

1805

perror_plus("sigaddset");

1350

1806

exitcode = EX_OSERR;

1351

1807

goto end;

1352

1808

}

1356

1812

*/

1357

1813

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

1358

1814

if(ret == -1){

1359

perror("sigaction");

1815

perror_plus("sigaction");

1360

1816

return EX_OSERR;

1361

1817

}

1362

1818

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1819

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

1364

1820

if(ret == -1){

1365

perror("sigaction");

1821

perror_plus("sigaction");

1366

1822

exitcode = EX_OSERR;

1367

1823

goto end;

1368

1824

}

1369

1825

}

1370

1826

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

1371

1827

if(ret == -1){

1372

perror("sigaction");

1828

perror_plus("sigaction");

1373

1829

return EX_OSERR;

1374

1830

}

1375

1831

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1832

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

1377

1833

if(ret == -1){

1378

perror("sigaction");

1834

perror_plus("sigaction");

1379

1835

exitcode = EX_OSERR;

1380

1836

goto end;

1381

1837

}

1382

1838

}

1383

1839

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

1384

1840

if(ret == -1){

1385

perror("sigaction");

1841

perror_plus("sigaction");

1386

1842

return EX_OSERR;

1387

1843

}

1388

1844

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1845

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

1390

1846

if(ret == -1){

1391

perror("sigaction");

1847

perror_plus("sigaction");

1392

1848

exitcode = EX_OSERR;

1393

1849

goto end;

1394

1850

}

1398

1854

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

1399

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1856

if(if_index == 0){

1401

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

1857

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

1858

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

1402

1859

exitcode = EX_UNAVAILABLE;

1403

1860

goto end;

1404

1861

}

1411

1868

errno = 0;

1412

1869

ret = seteuid(0);

1413

1870

if(ret == -1){

1414

perror("seteuid");

1871

perror_plus("seteuid");

1415

1872

}

1416

1873

1417

1874

#ifdef __linux__

1421

1878

bool restore_loglevel = true;

1422

1879

if(ret == -1){

1423

1880

restore_loglevel = false;

1424

perror("klogctl");

1881

perror_plus("klogctl");

1425

1882

}

1426

1883

#endif /* __linux__ */

1427

1884

1428

1885

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1886

if(sd < 0){

1430

perror("socket");

1887

perror_plus("socket");

1431

1888

exitcode = EX_OSERR;

1432

1889

#ifdef __linux__

1433

1890

if(restore_loglevel){

1434

1891

ret = klogctl(7, NULL, 0);

1435

1892

if(ret == -1){

1436

perror("klogctl");

1893

perror_plus("klogctl");

1437

1894

}

1438

1895

}

1439

1896

#endif /* __linux__ */

1441

1898

errno = 0;

1442

1899

ret = seteuid(uid);

1443

1900

if(ret == -1){

1444

perror("seteuid");

1901

perror_plus("seteuid");

1445

1902

}

1446

1903

goto end;

1447

1904

}

1448

1905

strcpy(network.ifr_name, interface);

1449

1906

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

1450

1907

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1908

perror_plus("ioctl SIOCGIFFLAGS");

1452

1909

#ifdef __linux__

1453

1910

if(restore_loglevel){

1454

1911

ret = klogctl(7, NULL, 0);

1455

1912

if(ret == -1){

1456

perror("klogctl");

1913

perror_plus("klogctl");

1457

1914

}

1458

1915

}

1459

1916

#endif /* __linux__ */

1462

1919

errno = 0;

1463

1920

ret = seteuid(uid);

1464

1921

if(ret == -1){

1465

perror("seteuid");

1922

perror_plus("seteuid");

1466

1923

}

1467

1924

goto end;

1468

1925

}

1472

1929

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

1473

1930

if(ret == -1){

1474

1931

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1932

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1933

exitcode = EX_OSERR;

1477

1934

#ifdef __linux__

1478

1935

if(restore_loglevel){

1479

1936

ret = klogctl(7, NULL, 0);

1480

1937

if(ret == -1){

1481

perror("klogctl");

1938

perror_plus("klogctl");

1482

1939

}

1483

1940

}

1484

1941

#endif /* __linux__ */

1486

1943

errno = 0;

1487

1944

ret = seteuid(uid);

1488

1945

if(ret == -1){

1489

perror("seteuid");

1946

perror_plus("seteuid");

1490

1947

}

1491

1948

goto end;

1492

1949

}

1493

1950

}

1494

/* sleep checking until interface is running */

1951

/* Sleep checking until interface is running.

1952

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

1495

1953

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

1496

1954

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

1497

1955

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1956

perror_plus("ioctl SIOCGIFFLAGS");

1499

1957

} else if(network.ifr_flags & IFF_RUNNING){

1500

1958

break;

1501

1959

}

1502

1960

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1961

ret = nanosleep(&sleeptime, NULL);

1504

1962

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

1505

perror("nanosleep");

1963

perror_plus("nanosleep");

1506

1964

}

1507

1965

}

1508

1966

if(not take_down_interface){

1509

1967

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

1510

1968

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

1511

1969

if(ret == -1){

1512

perror("close");

1970

perror_plus("close");

1513

1971

}

1514

1972

}

1515

1973

#ifdef __linux__

1517

1975

/* Restores kernel loglevel to default */

1518

1976

ret = klogctl(7, NULL, 0);

1519

1977

if(ret == -1){

1520

perror("klogctl");

1978

perror_plus("klogctl");

1521

1979

}

1522

1980

}

1523

1981

#endif /* __linux__ */

1527

1985

/* Lower privileges */

1528

1986

ret = seteuid(uid);

1529

1987

if(ret == -1){

1530

perror("seteuid");

1988

perror_plus("seteuid");

1531

1989

}

1532

1990

} else {

1533

1991

/* Lower privileges permanently */

1534

1992

ret = setuid(uid);

1535

1993

if(ret == -1){

1536

perror("setuid");

1994

perror_plus("setuid");

1537

1995

}

1538

1996

}

1539

1997

}

1544

2002

1545

2003

ret = init_gnutls_global(pubkey, seckey);

1546

2004

if(ret == -1){

1547

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

2005

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

2006

"init_gnutls_global failed\n");

1548

2007

exitcode = EX_UNAVAILABLE;

1549

2008

goto end;

1550

2009

} else {

1555

2014

goto end;

1556

2015

}

1557

2016

2017

if(mkdtemp(tempdir) == NULL){

2018

perror_plus("mkdtemp");

2019

goto end;

2020

}

1558

2021

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2022

1565

2023

if(quit_now){

1566

2024

goto end;

1567

2025

}

1568

2026

1569

2027

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

1570

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

2028

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

2029

"init_gpgme failed\n");

1571

2030

exitcode = EX_UNAVAILABLE;

1572

2031

goto end;

1573

2032

} else {

1583

2042

/* (Mainly meant for debugging) */

1584

2043

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

1585

2044

if(address == NULL){

1586

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

2045

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

2046

"No colon in address\n");

1587

2047

exitcode = EX_USAGE;

1588

2048

goto end;

1589

2049

}

1597

2057

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

1598

2058

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

1599

2059

or tmpmax != (uint16_t)tmpmax){

1600

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

2060

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

2061

"Bad port number\n");

1601

2062

exitcode = EX_USAGE;

1602

2063

goto end;

1603

2064

}

1608

2069

1609

2070

port = (uint16_t)tmpmax;

1610

2071

*address = '\0';

1611

address = connect_to;

1612

2072

/* Colon in address indicates IPv6 */

1613

2073

int af;

1614

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

2074

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

1615

2075

af = AF_INET6;

2076

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

2077

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

2078

{

2079

connect_to++;

2080

address[-1] = '\0';

2081

}

1616

2082

} else {

1617

2083

af = AF_INET;

1618

2084

}

2085

address = connect_to;

1619

2086

1620

2087

if(quit_now){

1621

2088

goto end;

1622

2089

}

1623

2090

1624

2091

while(not quit_now){

1625

2092

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

1626

2093

if(quit_now or ret == 0){

1627

2094

break;

1628

2095

}

1629

sleep(15);

1630

};

1631

2096

if(debug){

2097

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

2098

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

2099

}

2100

sleep((int)retry_interval);

2101

}

2102

1632

2103

if (not quit_now){

1633

2104

exitcode = EXIT_SUCCESS;

1634

2105

}

1635

2106

1636

2107

goto end;

1637

2108

}

1638

2109

1660

2131

1661

2132

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

1662

2133

if(mc.server == NULL){

1663

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

2134

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

2135

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

1664

2136

avahi_strerror(error));

1665

2137

exitcode = EX_UNAVAILABLE;

1666

2138

goto end;

1675

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2148

NULL, 0, browse_callback, NULL);

1677

2149

if(sb == NULL){

1678

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

2150

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

2151

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

1679

2152

avahi_strerror(avahi_server_errno(mc.server)));

1680

2153

exitcode = EX_UNAVAILABLE;

1681

2154

goto end;

1688

2161

/* Run the main loop */

1689

2162

1690

2163

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2164

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

2165

"Starting Avahi loop search\n");

2166

}

2167

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

(int)(retry_interval * 1000));

2170

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2174

}

1695

2175

1696

2176

end:

1697

2177

1698

2178

if(debug){

1699

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

2179

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

2180

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

1700

2181

}

1701

2182

1702

2183

/* Cleanup things */

1718

2199

if(gpgme_initialized){

1719

2200

gpgme_release(mc.ctx);

1720

2201

}

2202

2203

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

2204

has seen */

2205

if(mc.current_server != NULL){

2206

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

2207

while(mc.current_server != NULL){

2208

server *next = mc.current_server->next;

2209

free(mc.current_server);

2210

mc.current_server = next;

2211

}

2212

}

2213

2214

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

1721

2215

1722

2216

/* Take down the network interface */

1723

2217

if(take_down_interface){

1725

2219

errno = 0;

1726

2220

ret = seteuid(0);

1727

2221

if(ret == -1){

1728

perror("seteuid");

2222

perror_plus("seteuid");

1729

2223

}

1730

2224

if(geteuid() == 0){

1731

2225

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

1732

2226

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2227

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

1735

2229

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

1736

2230

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

1737

2231

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2232

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2233

}

1740

2234

}

1741

2235

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

1742

2236

if(ret == -1){

1743

perror("close");

2237

perror_plus("close");

1744

2238

}

1745

2239

/* Lower privileges permanently */

1746

2240

errno = 0;

1747

2241

ret = setuid(uid);

1748

2242

if(ret == -1){

1749

perror("setuid");

2243

perror_plus("setuid");

1750

2244

}

1751

2245

}

1752

2246

}

1753

2247

1754

/* Removes the temp directory used by GPGME */

2248

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

1755

2249

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

}

2250

struct dirent **direntries = NULL;

2251

struct dirent *direntry = NULL;

2252

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

2253

alphasort);

2254

if (numentries > 0){

2255

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

2256

direntry = direntries[i];

1776

2257

char *fullname = NULL;

1777

2258

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

1778

2259

direntry->d_name);

1779

2260

if(ret < 0){

1780

perror("asprintf");

2261

perror_plus("asprintf");

1781

2262

continue;

1782

2263

}

1783

2264

ret = remove(fullname);

1784

2265

if(ret == -1){

1785

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

1786

strerror(errno));

2266

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

2267

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

1787

2268

}

1788

2269

free(fullname);

1789

2270

}

1790

closedir(d);

2271

}

2272

2273

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

2274

free(direntries);

2275

if (numentries == -1){

2276

perror_plus("scandir");

1791

2277

}

1792

2278

ret = rmdir(tempdir);

1793

2279

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

1794

perror("rmdir");

2280

perror_plus("rmdir");

1795

2281

}

1796

2282

}

1797

2283

1802

2288

&old_sigterm_action,

1803

2289

NULL));

1804

2290

if(ret == -1){

1805

perror("sigaction");

2291

perror_plus("sigaction");

1806

2292

}

1807

2293

do {

1808

2294

ret = raise(signal_received);

1809

2295

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

1810

2296

if(ret != 0){

1811

perror("raise");

2297

perror_plus("raise");

1812

2298

abort();

1813

2299

}

1814

2300

TEMP_FAILURE_RETRY(pause());