/mandos/trunk : revision 505.3.5

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

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 */

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

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>";

134

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

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;

130

148

131

149

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

132

150

typedef struct {

137

155

gnutls_dh_params_t dh_params;

138

156

const char *priority;

139

157

gpgme_ctx_t ctx;

158

server *current_server;

140

159

} mandos_context;

141

160

142

161

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

143

162

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

144

163

.dh_bits = 1024, .priority = "SECURE256"

145

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

164

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

165

.current_server = NULL };

146

166

147

167

sig_atomic_t quit_now = 0;

148

168

int signal_received = 0;

149

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

150

177

/*

151

178

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

152

179

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

164

191

return buffer_capacity;

165

192

}

166

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

167

232

/*

168

233

* Initialize GPGME.

169

234

*/

183

248

184

249

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

185

250

if(fd == -1){

186

perror("open");

251

perror_plus("open");

187

252

return false;

188

253

}

189

254

190

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

256

if(rc != GPG_ERR_NO_ERROR){

192

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",

193

259

gpgme_strsource(rc), gpgme_strerror(rc));

194

260

return false;

195

261

}

196

262

197

263

rc = gpgme_op_import(mc.ctx, pgp_data);

198

264

if(rc != GPG_ERR_NO_ERROR){

199

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

265

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

266

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

200

267

gpgme_strsource(rc), gpgme_strerror(rc));

201

268

return false;

202

269

}

203

270

204

271

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

205

272

if(ret == -1){

206

perror("close");

273

perror_plus("close");

207

274

}

208

275

gpgme_data_release(pgp_data);

209

276

return true;

210

277

}

211

278

212

279

if(debug){

213

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

280

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

281

"Initializing GPGME\n");

214

282

}

215

283

216

284

/* Init GPGME */

217

285

gpgme_check_version(NULL);

218

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

287

if(rc != GPG_ERR_NO_ERROR){

220

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",

221

290

gpgme_strsource(rc), gpgme_strerror(rc));

222

291

return false;

223

292

}

224

293

225

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

294

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

226

295

rc = gpgme_get_engine_info(&engine_info);

227

296

if(rc != GPG_ERR_NO_ERROR){

228

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",

229

299

gpgme_strsource(rc), gpgme_strerror(rc));

230

300

return false;

231

301

}

238

308

engine_info = engine_info->next;

239

309

}

240

310

if(engine_info == NULL){

241

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);

242

313

return false;

243

314

}

244

315

245

316

/* Create new GPGME "context" */

246

317

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

247

318

if(rc != GPG_ERR_NO_ERROR){

248

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

249

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));

250

322

return false;

251

323

}

252

324

271

343

ssize_t plaintext_length = 0;

272

344

273

345

if(debug){

274

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

346

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

347

"Trying to decrypt OpenPGP data\n");

275

348

}

276

349

277

350

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

278

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

352

0);

280

353

if(rc != GPG_ERR_NO_ERROR){

281

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",

282

356

gpgme_strsource(rc), gpgme_strerror(rc));

283

357

return -1;

284

358

}

286

360

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

287

361

rc = gpgme_data_new(&dh_plain);

288

362

if(rc != GPG_ERR_NO_ERROR){

289

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

363

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

364

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

290

365

gpgme_strsource(rc), gpgme_strerror(rc));

291

366

gpgme_data_release(dh_crypto);

292

367

return -1;

296

371

data buffer */

297

372

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

298

373

if(rc != GPG_ERR_NO_ERROR){

299

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

374

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

375

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

300

376

gpgme_strsource(rc), gpgme_strerror(rc));

301

377

plaintext_length = -1;

302

378

if(debug){

303

379

gpgme_decrypt_result_t result;

304

380

result = gpgme_op_decrypt_result(mc.ctx);

305

381

if(result == NULL){

306

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

382

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

383

"gpgme_op_decrypt_result failed\n");

307

384

} else {

308

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

385

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

386

"Unsupported algorithm: %s\n",

309

387

result->unsupported_algorithm);

310

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

388

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

389

"Wrong key usage: %u\n",

311

390

result->wrong_key_usage);

312

391

if(result->file_name != NULL){

313

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

392

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

393

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

314

394

}

315

395

gpgme_recipient_t recipient;

316

396

recipient = result->recipients;

317

397

while(recipient != NULL){

318

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

398

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

399

"Public key algorithm: %s\n",

319

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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",

322

405

recipient->status == GPG_ERR_NO_SECKEY

323

406

? "No" : "Yes");

324

407

recipient = recipient->next;

329

412

}

330

413

331

414

if(debug){

332

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

415

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

416

"Decryption of OpenPGP data succeeded\n");

333

417

}

334

418

335

419

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

336

420

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

337

perror("gpgme_data_seek");

421

perror_plus("gpgme_data_seek");

338

422

plaintext_length = -1;

339

423

goto decrypt_end;

340

424

}

345

429

(size_t)plaintext_length,

346

430

plaintext_capacity);

347

431

if(plaintext_capacity == 0){

348

perror("incbuffer");

432

perror_plus("incbuffer");

349

433

plaintext_length = -1;

350

434

goto decrypt_end;

351

435

}

358

442

break;

359

443

}

360

444

if(ret < 0){

361

perror("gpgme_data_read");

445

perror_plus("gpgme_data_read");

362

446

plaintext_length = -1;

363

447

goto decrypt_end;

364

448

}

366

450

}

367

451

368

452

if(debug){

369

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

453

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

454

"Decrypted password is: ");

370

455

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

371

456

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

372

457

}

394

479

/* GnuTLS log function callback */

395

480

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

396

481

const char* string){

397

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

482

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

398

483

}

399

484

400

485

static int init_gnutls_global(const char *pubkeyfilename,

402

487

int ret;

403

488

404

489

if(debug){

405

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

490

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

491

"Initializing GnuTLS\n");

406

492

}

407

493

408

494

ret = gnutls_global_init();

409

495

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

496

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

497

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

412

498

return -1;

413

499

}

414

500

421

507

}

422

508

423

509

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

511

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

512

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

513

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

431

514

gnutls_global_deinit();

432

515

return -1;

433

516

}

434

517

435

518

if(debug){

436

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"

437

521

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

438

522

seckeyfilename);

439

523

}

443

527

GNUTLS_OPENPGP_FMT_BASE64);

444

528

if(ret != GNUTLS_E_SUCCESS){

445

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

446

531

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

447

532

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

448

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

449

safer_gnutls_strerror(ret));

533

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

534

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

450

535

goto globalfail;

451

536

}

452

537

453

538

/* GnuTLS server initialization */

454

539

ret = gnutls_dh_params_init(&mc.dh_params);

455

540

if(ret != GNUTLS_E_SUCCESS){

456

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

541

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

542

"Error in GnuTLS DH parameter initialization:"

457

543

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

458

544

goto globalfail;

459

545

}

460

546

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

461

547

if(ret != GNUTLS_E_SUCCESS){

462

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

548

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

549

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

463

550

safer_gnutls_strerror(ret));

464

551

goto globalfail;

465

552

}

486

573

}

487

574

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

488

575

if(ret != GNUTLS_E_SUCCESS){

489

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

576

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

577

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

490

578

safer_gnutls_strerror(ret));

491

579

}

492

580

500

588

}

501

589

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

502

590

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

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));

506

595

gnutls_deinit(*session);

507

596

return -1;

508

597

}

517

606

}

518

607

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

519

608

if(ret != GNUTLS_E_SUCCESS){

520

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

609

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

610

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

521

611

safer_gnutls_strerror(ret));

522

612

gnutls_deinit(*session);

523

613

return -1;

569

659

pf = PF_INET;

570

660

break;

571

661

default:

572

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

662

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

663

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

573

664

errno = EINVAL;

574

665

return -1;

575

666

}

580

671

}

581

672

582

673

if(debug){

583

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

584

676

"\n", ip, port);

585

677

}

586

678

587

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

680

if(tcp_sd < 0){

589

681

int e = errno;

590

perror("socket");

682

perror_plus("socket");

591

683

errno = e;

592

684

goto mandos_end;

593

685

}

607

699

}

608

700

if(ret < 0 ){

609

701

int e = errno;

610

perror("inet_pton");

702

perror_plus("inet_pton");

611

703

errno = e;

612

704

goto mandos_end;

613

705

}

614

706

if(ret == 0){

615

707

int e = errno;

616

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

708

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

709

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

617

710

errno = e;

618

711

goto mandos_end;

619

712

}

626

719

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

627

720

-Wunreachable-code*/

628

721

if(if_index == AVAHI_IF_UNSPEC){

629

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

722

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

723

"An IPv6 link-local address is incomplete"

630

724

" without a network interface\n");

631

725

errno = EINVAL;

632

726

goto mandos_end;

649

743

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

650

744

char interface[IF_NAMESIZE];

651

745

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

652

perror("if_indextoname");

746

perror_plus("if_indextoname");

653

747

} else {

654

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

748

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

749

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

655

750

ip, interface, port);

656

751

}

657

752

} else {

658

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

659

port);

753

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

754

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

660

755

}

661

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

669

764

sizeof(addrstr));

670

765

}

671

766

if(pcret == NULL){

672

perror("inet_ntop");

767

perror_plus("inet_ntop");

673

768

} else {

674

769

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

675

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

770

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

771

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

676

772

}

677

773

}

678

774

}

688

784

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

689

785

}

690

786

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

787

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

788

int e = errno;

789

perror_plus("connect");

790

errno = e;

791

}

694

792

goto mandos_end;

695

793

}

696

794

707

805

out_size - written));

708

806

if(ret == -1){

709

807

int e = errno;

710

perror("write");

808

perror_plus("write");

711

809

errno = e;

712

810

goto mandos_end;

713

811

}

730

828

}

731

829

732

830

if(debug){

733

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

831

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

832

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

734

833

}

735

834

736

835

if(quit_now){

738

837

goto mandos_end;

739

838

}

740

839

840

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

741

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

842

743

843

if(quit_now){

755

855

756

856

if(ret != GNUTLS_E_SUCCESS){

757

857

if(debug){

758

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

858

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

859

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

759

860

gnutls_perror(ret);

760

861

}

761

862

errno = EPROTO;

765

866

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

766

867

767

868

if(debug){

768

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

769

ip);

869

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

870

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

770

871

}

771

872

772

873

while(true){

780

881

buffer_capacity);

781

882

if(buffer_capacity == 0){

782

883

int e = errno;

783

perror("incbuffer");

884

perror_plus("incbuffer");

784

885

errno = e;

785

886

goto mandos_end;

786

887

}

810

911

}

811

912

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

812

913

if(ret < 0){

813

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

914

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

915

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

814

916

gnutls_perror(ret);

815

917

errno = EPROTO;

816

918

goto mandos_end;

817

919

}

818

920

break;

819

921

default:

820

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

922

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

923

"Unknown error while reading data from"

821

924

" encrypted session with Mandos server\n");

822

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

926

errno = EIO;

829

932

}

830

933

831

934

if(debug){

832

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

935

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

936

"Closing TLS session\n");

833

937

}

834

938

835

939

if(quit_now){

865

969

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

866

970

int e = errno;

867

971

if(debug){

868

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

972

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

973

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

869

974

strerror(errno));

870

975

}

871

976

errno = e;

891

996

if(e == 0){

892

997

e = errno;

893

998

}

894

perror("close");

999

perror_plus("close");

895

1000

}

896

1001

gnutls_deinit(session);

1002

errno = e;

897

1003

if(quit_now){

898

e = EINTR;

1004

errno = EINTR;

899

1005

retval = -1;

900

1006

}

901

errno = e;

902

1007

}

903

1008

return retval;

904

1009

}

929

1034

switch(event){

930

1035

default:

931

1036

case AVAHI_RESOLVER_FAILURE:

932

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

1037

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

1038

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

933

1039

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

934

1040

avahi_strerror(avahi_server_errno(mc.server)));

935

1041

break;

939

1045

char ip[AVAHI_ADDRESS_STR_MAX];

940

1046

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

941

1047

if(debug){

942

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

1048

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

1049

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

943

1050

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

944

1051

ip, (intmax_t)interface, port);

945

1052

}

947

1054

avahi_proto_to_af(proto));

948

1055

if(ret == 0){

949

1056

avahi_simple_poll_quit(mc.simple_poll);

1057

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

950

1060

}

951

1061

}

952

1062

}

976

1086

default:

977

1087

case AVAHI_BROWSER_FAILURE:

978

1088

979

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

1089

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

1090

"(Avahi browser) %s\n",

980

1091

avahi_strerror(avahi_server_errno(mc.server)));

981

1092

avahi_simple_poll_quit(mc.simple_poll);

982

1093

return;

990

1101

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

991

1102

name, type, domain, protocol, 0,

992

1103

resolve_callback, NULL) == NULL)

993

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",

994

1106

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

995

1107

break;

996

1108

1000

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1114

if(debug){

1003

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

1115

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

1116

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

1004

1117

}

1005

1118

break;

1006

1119

}

1007

1120

}

1008

1121

1009

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

1122

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

1010

1123

static void handle_sigterm(int sig){

1011

1124

if(quit_now){

1012

1125

return;

1014

1127

quit_now = 1;

1015

1128

signal_received = sig;

1016

1129

int old_errno = errno;

1130

/* set main loop to exit */

1017

1131

if(mc.simple_poll != NULL){

1018

1132

avahi_simple_poll_quit(mc.simple_poll);

1019

1133

}

1020

1134

errno = old_errno;

1021

1135

}

1022

1136

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){

1148

if(debug){

1149

perror_plus("ioctl SIOCGIFFLAGS");

1150

}

1151

return false;

1152

}

1153

return true;

1154

}

1155

1156

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

1157

1158

/* Reject the loopback device */

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

if(debug){

1161

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

1162

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

1163

}

1164

return false;

1165

}

1166

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

1167

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

1168

if(debug){

1169

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

1170

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

1171

}

1172

return true;

1173

}

1174

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

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

1191

/* Accept this device */

1192

if(debug){

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

}

1405

}

1406

1023

1407

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

1024

1408

AvahiSServiceBrowser *sb = NULL;

1025

1409

int error;

1027

1411

intmax_t tmpmax;

1028

1412

char *tmp;

1029

1413

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1414

const char *interface = "";

1031

1415

struct ifreq network;

1032

1416

int sd = -1;

1033

1417

bool take_down_interface = false;

1034

1418

uid_t uid;

1035

1419

gid_t gid;

1036

char *connect_to = NULL;

1037

1420

char tempdir[] = "/tmp/mandosXXXXXX";

1038

1421

bool tempdir_created = false;

1039

1422

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1043

1426

bool gnutls_initialized = false;

1044

1427

bool gpgme_initialized = false;

1045

1428

float delay = 2.5f;

1429

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

1430

retrying the same server again */

1046

1431

1047

1432

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1433

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1439

errno = 0;

1055

1440

ret = setgid(gid);

1056

1441

if(ret == -1){

1057

perror("setgid");

1442

perror_plus("setgid");

1058

1443

}

1059

1444

1060

1445

/* Lower user privileges (temporarily) */

1061

1446

errno = 0;

1062

1447

ret = seteuid(uid);

1063

1448

if(ret == -1){

1064

perror("seteuid");

1449

perror_plus("seteuid");

1065

1450

}

1066

1451

1067

1452

if(quit_now){

1102

1487

.arg = "SECONDS",

1103

1488

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

1104

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 },

1105

1498

/*

1106

1499

* These reproduce what we would get without ARGP_NO_HELP

1107

1500

*/

1151

1544

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

1152

1545

argp_error(state, "Bad delay");

1153

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;

1154

1558

break;

1155

1559

/*

1156

1560

* These reproduce what we would get without ARGP_NO_HELP

1163

1567

argp_state_help(state, state->out_stream,

1164

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

1569

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

1570

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

1166

1571

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

1167

1572

exit(argp_err_exit_status);

1168

1573

break;

1184

1589

case ENOMEM:

1185

1590

default:

1186

1591

errno = ret;

1187

perror("argp_parse");

1592

perror_plus("argp_parse");

1188

1593

exitcode = EX_OSERR;

1189

1594

goto end;

1190

1595

case EINVAL:

1192

1597

goto end;

1193

1598

}

1194

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

}

1195

1754

1196

1755

if(not debug){

1197

1756

avahi_set_log_function(empty_log);

1198

1757

}

1199

1758

1759

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

1760

struct dirent **direntries;

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

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

}

1770

if(ret >= 1){

1771

/* Pick the first interface returned */

1772

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

1773

if(debug){

1774

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

1775

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

1776

}

1777

if(interface == NULL){

1778

perror_plus("malloc");

1779

free(direntries);

1780

exitcode = EXIT_FAILURE;

1781

goto end;

1782

}

1783

free(direntries);

1784

} else {

1785

free(direntries);

1786

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

1787

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

1788

exitcode = EXIT_FAILURE;

1789

goto end;

1790

}

1791

}

1792

1200

1793

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1201

1794

from the signal handler */

1202

1795

/* Initialize the pseudo-RNG for Avahi */

1203

1796

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

1204

1797

mc.simple_poll = avahi_simple_poll_new();

1205

1798

if(mc.simple_poll == NULL){

1206

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");

1207

1801

exitcode = EX_UNAVAILABLE;

1208

1802

goto end;

1209

1803

}

1211

1805

sigemptyset(&sigterm_action.sa_mask);

1212

1806

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

1213

1807

if(ret == -1){

1214

perror("sigaddset");

1808

perror_plus("sigaddset");

1215

1809

exitcode = EX_OSERR;

1216

1810

goto end;

1217

1811

}

1218

1812

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

1219

1813

if(ret == -1){

1220

perror("sigaddset");

1814

perror_plus("sigaddset");

1221

1815

exitcode = EX_OSERR;

1222

1816

goto end;

1223

1817

}

1224

1818

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

1225

1819

if(ret == -1){

1226

perror("sigaddset");

1820

perror_plus("sigaddset");

1227

1821

exitcode = EX_OSERR;

1228

1822

goto end;

1229

1823

}

1233

1827

*/

1234

1828

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

1235

1829

if(ret == -1){

1236

perror("sigaction");

1830

perror_plus("sigaction");

1237

1831

return EX_OSERR;

1238

1832

}

1239

1833

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1834

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

1241

1835

if(ret == -1){

1242

perror("sigaction");

1836

perror_plus("sigaction");

1243

1837

exitcode = EX_OSERR;

1244

1838

goto end;

1245

1839

}

1246

1840

}

1247

1841

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

1248

1842

if(ret == -1){

1249

perror("sigaction");

1843

perror_plus("sigaction");

1250

1844

return EX_OSERR;

1251

1845

}

1252

1846

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1847

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

1254

1848

if(ret == -1){

1255

perror("sigaction");

1849

perror_plus("sigaction");

1256

1850

exitcode = EX_OSERR;

1257

1851

goto end;

1258

1852

}

1259

1853

}

1260

1854

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

1261

1855

if(ret == -1){

1262

perror("sigaction");

1856

perror_plus("sigaction");

1263

1857

return EX_OSERR;

1264

1858

}

1265

1859

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1860

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

1267

1861

if(ret == -1){

1268

perror("sigaction");

1862

perror_plus("sigaction");

1269

1863

exitcode = EX_OSERR;

1270

1864

goto end;

1271

1865

}

1272

1866

}

1273

1867

1274

1868

/* If the interface is down, bring it up */

1275

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

1869

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

1276

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1871

if(if_index == 0){

1278

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

1872

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

1873

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

1279

1874

exitcode = EX_UNAVAILABLE;

1280

1875

goto end;

1281

1876

}

1288

1883

errno = 0;

1289

1884

ret = seteuid(0);

1290

1885

if(ret == -1){

1291

perror("seteuid");

1886

perror_plus("seteuid");

1292

1887

}

1293

1888

1294

1889

#ifdef __linux__

1298

1893

bool restore_loglevel = true;

1299

1894

if(ret == -1){

1300

1895

restore_loglevel = false;

1301

perror("klogctl");

1896

perror_plus("klogctl");

1302

1897

}

1303

1898

#endif /* __linux__ */

1304

1899

1305

1900

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1901

if(sd < 0){

1307

perror("socket");

1902

perror_plus("socket");

1308

1903

exitcode = EX_OSERR;

1309

1904

#ifdef __linux__

1310

1905

if(restore_loglevel){

1311

1906

ret = klogctl(7, NULL, 0);

1312

1907

if(ret == -1){

1313

perror("klogctl");

1908

perror_plus("klogctl");

1314

1909

}

1315

1910

}

1316

1911

#endif /* __linux__ */

1318

1913

errno = 0;

1319

1914

ret = seteuid(uid);

1320

1915

if(ret == -1){

1321

perror("seteuid");

1916

perror_plus("seteuid");

1322

1917

}

1323

1918

goto end;

1324

1919

}

1325

1920

strcpy(network.ifr_name, interface);

1326

1921

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

1327

1922

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1923

perror_plus("ioctl SIOCGIFFLAGS");

1329

1924

#ifdef __linux__

1330

1925

if(restore_loglevel){

1331

1926

ret = klogctl(7, NULL, 0);

1332

1927

if(ret == -1){

1333

perror("klogctl");

1928

perror_plus("klogctl");

1334

1929

}

1335

1930

}

1336

1931

#endif /* __linux__ */

1339

1934

errno = 0;

1340

1935

ret = seteuid(uid);

1341

1936

if(ret == -1){

1342

perror("seteuid");

1937

perror_plus("seteuid");

1343

1938

}

1344

1939

goto end;

1345

1940

}

1349

1944

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

1350

1945

if(ret == -1){

1351

1946

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1947

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1353

1948

exitcode = EX_OSERR;

1354

1949

#ifdef __linux__

1355

1950

if(restore_loglevel){

1356

1951

ret = klogctl(7, NULL, 0);

1357

1952

if(ret == -1){

1358

perror("klogctl");

1953

perror_plus("klogctl");

1359

1954

}

1360

1955

}

1361

1956

#endif /* __linux__ */

1363

1958

errno = 0;

1364

1959

ret = seteuid(uid);

1365

1960

if(ret == -1){

1366

perror("seteuid");

1961

perror_plus("seteuid");

1367

1962

}

1368

1963

goto end;

1369

1964

}

1370

1965

}

1371

/* sleep checking until interface is running */

1966

/* Sleep checking until interface is running.

1967

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

1372

1968

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

1373

1969

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

1374

1970

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1971

perror_plus("ioctl SIOCGIFFLAGS");

1376

1972

} else if(network.ifr_flags & IFF_RUNNING){

1377

1973

break;

1378

1974

}

1379

1975

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

1976

ret = nanosleep(&sleeptime, NULL);

1381

1977

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

1382

perror("nanosleep");

1978

perror_plus("nanosleep");

1383

1979

}

1384

1980

}

1385

1981

if(not take_down_interface){

1386

1982

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

1387

1983

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

1388

1984

if(ret == -1){

1389

perror("close");

1985

perror_plus("close");

1390

1986

}

1391

1987

}

1392

1988

#ifdef __linux__

1394

1990

/* Restores kernel loglevel to default */

1395

1991

ret = klogctl(7, NULL, 0);

1396

1992

if(ret == -1){

1397

perror("klogctl");

1993

perror_plus("klogctl");

1398

1994

}

1399

1995

}

1400

1996

#endif /* __linux__ */

1404

2000

/* Lower privileges */

1405

2001

ret = seteuid(uid);

1406

2002

if(ret == -1){

1407

perror("seteuid");

2003

perror_plus("seteuid");

1408

2004

}

1409

2005

} else {

1410

2006

/* Lower privileges permanently */

1411

2007

ret = setuid(uid);

1412

2008

if(ret == -1){

1413

perror("setuid");

2009

perror_plus("setuid");

1414

2010

}

1415

2011

}

1416

2012

}

1421

2017

1422

2018

ret = init_gnutls_global(pubkey, seckey);

1423

2019

if(ret == -1){

1424

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

2020

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

2021

"init_gnutls_global failed\n");

1425

2022

exitcode = EX_UNAVAILABLE;

1426

2023

goto end;

1427

2024

} else {

1432

2029

goto end;

1433

2030

}

1434

2031

2032

if(mkdtemp(tempdir) == NULL){

2033

perror_plus("mkdtemp");

2034

goto end;

2035

}

1435

2036

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

1439

goto end;

1440

}

1441

2037

1442

2038

if(quit_now){

1443

2039

goto end;

1444

2040

}

1445

2041

1446

2042

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

1447

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

2043

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

2044

"init_gpgme failed\n");

1448

2045

exitcode = EX_UNAVAILABLE;

1449

2046

goto end;

1450

2047

} else {

1460

2057

/* (Mainly meant for debugging) */

1461

2058

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

1462

2059

if(address == NULL){

1463

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

2060

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

2061

"No colon in address\n");

1464

2062

exitcode = EX_USAGE;

1465

2063

goto end;

1466

2064

}

1474

2072

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

1475

2073

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

1476

2074

or tmpmax != (uint16_t)tmpmax){

1477

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

2075

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

2076

"Bad port number\n");

1478

2077

exitcode = EX_USAGE;

1479

2078

goto end;

1480

2079

}

1485

2084

1486

2085

port = (uint16_t)tmpmax;

1487

2086

*address = '\0';

1488

address = connect_to;

1489

2087

/* Colon in address indicates IPv6 */

1490

2088

int af;

1491

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

2089

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

1492

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

}

1493

2097

} else {

1494

2098

af = AF_INET;

1495

2099

}

2100

address = connect_to;

1496

2101

1497

2102

if(quit_now){

1498

2103

goto end;

1499

2104

}

1500

2105

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2106

while(not quit_now){

2107

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

2108

if(quit_now or ret == 0){

2109

break;

2110

}

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

2118

if (not quit_now){

1523

2119

exitcode = EXIT_SUCCESS;

1524

2120

}

2121

1525

2122

goto end;

1526

2123

}

1527

2124

1549

2146

1550

2147

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

1551

2148

if(mc.server == NULL){

1552

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

2149

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

2150

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

1553

2151

avahi_strerror(error));

1554

2152

exitcode = EX_UNAVAILABLE;

1555

2153

goto end;

1564

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

2163

NULL, 0, browse_callback, NULL);

1566

2164

if(sb == NULL){

1567

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

2165

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

2166

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

1568

2167

avahi_strerror(avahi_server_errno(mc.server)));

1569

2168

exitcode = EX_UNAVAILABLE;

1570

2169

goto end;

1577

2176

/* Run the main loop */

1578

2177

1579

2178

if(debug){

1580

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

1581

}

1582

1583

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

}

1584

2190

1585

2191

end:

1586

2192

1587

2193

if(debug){

1588

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

2194

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

2195

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

1589

2196

}

1590

2197

1591

2198

/* Cleanup things */

1607

2214

if(gpgme_initialized){

1608

2215

gpgme_release(mc.ctx);

1609

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 */

1610

2230

1611

2231

/* Take down the network interface */

1612

2232

if(take_down_interface){

1614

2234

errno = 0;

1615

2235

ret = seteuid(0);

1616

2236

if(ret == -1){

1617

perror("seteuid");

2237

perror_plus("seteuid");

1618

2238

}

1619

2239

if(geteuid() == 0){

1620

2240

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

1621

2241

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

2242

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

1624

2244

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

1625

2245

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

1626

2246

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

2247

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1628

2248

}

1629

2249

}

1630

2250

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

1631

2251

if(ret == -1){

1632

perror("close");

2252

perror_plus("close");

1633

2253

}

1634

2254

/* Lower privileges permanently */

1635

2255

errno = 0;

1636

2256

ret = setuid(uid);

1637

2257

if(ret == -1){

1638

perror("setuid");

2258

perror_plus("setuid");

1639

2259

}

1640

2260

}

1641

2261

}

1642

2262

1643

/* Removes the temp directory used by GPGME */

2263

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

1644

2264

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

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];

1665

2272

char *fullname = NULL;

1666

2273

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

1667

2274

direntry->d_name);

1668

2275

if(ret < 0){

1669

perror("asprintf");

2276

perror_plus("asprintf");

1670

2277

continue;

1671

2278

}

1672

2279

ret = remove(fullname);

1673

2280

if(ret == -1){

1674

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

1675

strerror(errno));

2281

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

2282

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

1676

2283

}

1677

2284

free(fullname);

1678

2285

}

1679

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");

1680

2292

}

1681

2293

ret = rmdir(tempdir);

1682

2294

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

1683

perror("rmdir");

2295

perror_plus("rmdir");

1684

2296

}

1685

2297

}

1686

2298

1691

2303

&old_sigterm_action,

1692

2304

NULL));

1693

2305

if(ret == -1){

1694

perror("sigaction");

2306

perror_plus("sigaction");

1695

2307

}

1696

2308

do {

1697

2309

ret = raise(signal_received);

1698

2310

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

1699

2311

if(ret != 0){

1700

perror("raise");

2312

perror_plus("raise");

1701

2313

abort();

1702

2314

}

1703

2315

TEMP_FAILURE_RETRY(pause());