/mandos/release : revision 237.2.173

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

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

87

91

88

#ifdef __linux__

92

89

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

125

122

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

126

123

#define SECKEY "seckey.txt"

127

124

#define PUBKEY "pubkey.txt"

128

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

129

125

130

126

bool debug = false;

131

127

static const char mandos_protocol_version[] = "1";

132

128

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

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

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;

129

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

147

130

148

131

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

149

132

typedef struct {

154

137

gnutls_dh_params_t dh_params;

155

138

const char *priority;

156

139

gpgme_ctx_t ctx;

157

server *current_server;

158

140

} mandos_context;

159

141

160

142

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

161

143

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

162

144

.dh_bits = 1024, .priority = "SECURE256"

163

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

164

.current_server = NULL };

145

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

165

146

166

147

sig_atomic_t quit_now = 0;

167

148

int signal_received = 0;

168

149

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

176

150

/*

177

151

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

178

152

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

190

164

return buffer_capacity;

191

165

}

192

166

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

231

167

/*

232

168

* Initialize GPGME.

233

169

*/

247

183

248

184

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

249

185

if(fd == -1){

250

perror_plus("open");

186

perror("open");

251

187

return false;

252

188

}

253

189

254

190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

191

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

192

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

258

193

gpgme_strsource(rc), gpgme_strerror(rc));

259

194

return false;

260

195

}

261

196

262

197

rc = gpgme_op_import(mc.ctx, pgp_data);

263

198

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

199

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

266

200

gpgme_strsource(rc), gpgme_strerror(rc));

267

201

return false;

268

202

}

269

203

270

204

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

271

205

if(ret == -1){

272

perror_plus("close");

206

perror("close");

273

207

}

274

208

gpgme_data_release(pgp_data);

275

209

return true;

276

210

}

277

211

278

212

if(debug){

279

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

280

"Initializing GPGME\n");

213

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

281

214

}

282

215

283

216

/* Init GPGME */

284

217

gpgme_check_version(NULL);

285

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

219

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

220

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

289

221

gpgme_strsource(rc), gpgme_strerror(rc));

290

222

return false;

291

223

}

292

224

293

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

225

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

294

226

rc = gpgme_get_engine_info(&engine_info);

295

227

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

228

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

298

229

gpgme_strsource(rc), gpgme_strerror(rc));

299

230

return false;

300

231

}

307

238

engine_info = engine_info->next;

308

239

}

309

240

if(engine_info == NULL){

310

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

311

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

241

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

312

242

return false;

313

243

}

314

244

315

245

/* Create new GPGME "context" */

316

246

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

317

247

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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

320

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

321

250

return false;

322

251

}

323

252

342

271

ssize_t plaintext_length = 0;

343

272

344

273

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

274

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

347

275

}

348

276

349

277

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

350

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

279

0);

352

280

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

281

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

355

282

gpgme_strsource(rc), gpgme_strerror(rc));

356

283

return -1;

357

284

}

359

286

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

360

287

rc = gpgme_data_new(&dh_plain);

361

288

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

289

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

364

290

gpgme_strsource(rc), gpgme_strerror(rc));

365

291

gpgme_data_release(dh_crypto);

366

292

return -1;

370

296

data buffer */

371

297

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

372

298

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

299

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

375

300

gpgme_strsource(rc), gpgme_strerror(rc));

376

301

plaintext_length = -1;

377

302

if(debug){

378

303

gpgme_decrypt_result_t result;

379

304

result = gpgme_op_decrypt_result(mc.ctx);

380

305

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

306

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

383

307

} else {

384

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

385

"Unsupported algorithm: %s\n",

308

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

386

309

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

310

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

389

311

result->wrong_key_usage);

390

312

if(result->file_name != NULL){

391

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

392

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

313

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

393

314

}

394

315

gpgme_recipient_t recipient;

395

316

recipient = result->recipients;

396

317

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

318

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

399

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

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",

320

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

321

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

404

322

recipient->status == GPG_ERR_NO_SECKEY

405

323

? "No" : "Yes");

406

324

recipient = recipient->next;

411

329

}

412

330

413

331

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

332

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

416

333

}

417

334

418

335

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

419

336

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

420

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

421

338

plaintext_length = -1;

422

339

goto decrypt_end;

423

340

}

428

345

(size_t)plaintext_length,

429

346

plaintext_capacity);

430

347

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

348

perror("incbuffer");

432

349

plaintext_length = -1;

433

350

goto decrypt_end;

434

351

}

441

358

break;

442

359

}

443

360

if(ret < 0){

444

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

445

362

plaintext_length = -1;

446

363

goto decrypt_end;

447

364

}

449

366

}

450

367

451

368

if(debug){

452

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

453

"Decrypted password is: ");

369

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

454

370

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

455

371

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

456

372

}

478

394

/* GnuTLS log function callback */

479

395

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

480

396

const char* string){

481

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

397

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

482

398

}

483

399

484

400

static int init_gnutls_global(const char *pubkeyfilename,

486

402

int ret;

487

403

488

404

if(debug){

489

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

490

"Initializing GnuTLS\n");

405

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

491

406

}

492

407

493

408

ret = gnutls_global_init();

494

409

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

410

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

411

safer_gnutls_strerror(ret));

497

412

return -1;

498

413

}

499

414

506

421

}

507

422

508

423

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

510

425

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

513

431

gnutls_global_deinit();

514

432

return -1;

515

433

}

516

434

517

435

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

436

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

520

437

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

521

438

seckeyfilename);

522

439

}

526

443

GNUTLS_OPENPGP_FMT_BASE64);

527

444

if(ret != GNUTLS_E_SUCCESS){

528

445

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

446

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

531

447

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

532

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

533

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

448

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

449

safer_gnutls_strerror(ret));

534

450

goto globalfail;

535

451

}

536

452

537

453

/* GnuTLS server initialization */

538

454

ret = gnutls_dh_params_init(&mc.dh_params);

539

455

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

456

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

542

457

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

543

458

goto globalfail;

544

459

}

545

460

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

546

461

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

462

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

549

463

safer_gnutls_strerror(ret));

550

464

goto globalfail;

551

465

}

572

486

}

573

487

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

574

488

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

489

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

577

490

safer_gnutls_strerror(ret));

578

491

}

579

492

587

500

}

588

501

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

589

502

if(ret != GNUTLS_E_SUCCESS){

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));

503

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

504

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

505

safer_gnutls_strerror(ret));

594

506

gnutls_deinit(*session);

595

507

return -1;

596

508

}

605

517

}

606

518

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

607

519

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

520

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

610

521

safer_gnutls_strerror(ret));

611

522

gnutls_deinit(*session);

612

523

return -1;

658

569

pf = PF_INET;

659

570

break;

660

571

default:

661

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

662

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

572

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

663

573

errno = EINVAL;

664

574

return -1;

665

575

}

670

580

}

671

581

672

582

if(debug){

673

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

674

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

583

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

675

584

"\n", ip, port);

676

585

}

677

586

678

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

679

588

if(tcp_sd < 0){

680

589

int e = errno;

681

perror_plus("socket");

590

perror("socket");

682

591

errno = e;

683

592

goto mandos_end;

684

593

}

698

607

}

699

608

if(ret < 0 ){

700

609

int e = errno;

701

perror_plus("inet_pton");

610

perror("inet_pton");

702

611

errno = e;

703

612

goto mandos_end;

704

613

}

705

614

if(ret == 0){

706

615

int e = errno;

707

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

708

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

616

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

709

617

errno = e;

710

618

goto mandos_end;

711

619

}

718

626

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

719

627

-Wunreachable-code*/

720

628

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

629

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

723

630

" without a network interface\n");

724

631

errno = EINVAL;

725

632

goto mandos_end;

742

649

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

743

650

char interface[IF_NAMESIZE];

744

651

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

745

perror_plus("if_indextoname");

652

perror("if_indextoname");

746

653

} else {

747

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

748

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

654

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

749

655

ip, interface, port);

750

656

}

751

657

} else {

752

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

753

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

658

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

659

port);

754

660

}

755

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

763

669

sizeof(addrstr));

764

670

}

765

671

if(pcret == NULL){

766

perror_plus("inet_ntop");

672

perror("inet_ntop");

767

673

} else {

768

674

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

769

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

770

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

675

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

771

676

}

772

677

}

773

678

}

783

688

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

784

689

}

785

690

if(ret < 0){

786

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

787

int e = errno;

788

perror_plus("connect");

789

errno = e;

790

}

691

int e = errno;

692

perror("connect");

693

errno = e;

791

694

goto mandos_end;

792

695

}

793

696

804

707

out_size - written));

805

708

if(ret == -1){

806

709

int e = errno;

807

perror_plus("write");

710

perror("write");

808

711

errno = e;

809

712

goto mandos_end;

810

713

}

827

730

}

828

731

829

732

if(debug){

830

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

831

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

733

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

832

734

}

833

735

834

736

if(quit_now){

836

738

goto mandos_end;

837

739

}

838

740

839

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

840

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

841

742

842

743

if(quit_now){

854

755

855

756

if(ret != GNUTLS_E_SUCCESS){

856

757

if(debug){

857

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

858

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

758

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

859

759

gnutls_perror(ret);

860

760

}

861

761

errno = EPROTO;

865

765

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

866

766

867

767

if(debug){

868

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

869

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

768

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

769

ip);

870

770

}

871

771

872

772

while(true){

880

780

buffer_capacity);

881

781

if(buffer_capacity == 0){

882

782

int e = errno;

883

perror_plus("incbuffer");

783

perror("incbuffer");

884

784

errno = e;

885

785

goto mandos_end;

886

786

}

910

810

}

911

811

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

912

812

if(ret < 0){

913

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

914

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

813

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

915

814

gnutls_perror(ret);

916

815

errno = EPROTO;

917

816

goto mandos_end;

918

817

}

919

818

break;

920

819

default:

921

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

922

"Unknown error while reading data from"

820

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

923

821

" encrypted session with Mandos server\n");

924

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

823

errno = EIO;

931

829

}

932

830

933

831

if(debug){

934

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

935

"Closing TLS session\n");

832

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

936

833

}

937

834

938

835

if(quit_now){

968

865

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

969

866

int e = errno;

970

867

if(debug){

971

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

972

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

868

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

973

869

strerror(errno));

974

870

}

975

871

errno = e;

995

891

if(e == 0){

996

892

e = errno;

997

893

}

998

perror_plus("close");

894

perror("close");

999

895

}

1000

896

gnutls_deinit(session);

1001

errno = e;

1002

897

if(quit_now){

1003

errno = EINTR;

898

e = EINTR;

1004

899

retval = -1;

1005

900

}

901

errno = e;

1006

902

}

1007

903

return retval;

1008

904

}

1033

929

switch(event){

1034

930

default:

1035

931

case AVAHI_RESOLVER_FAILURE:

1036

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

1037

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

932

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

1038

933

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

1039

934

avahi_strerror(avahi_server_errno(mc.server)));

1040

935

break;

1044

939

char ip[AVAHI_ADDRESS_STR_MAX];

1045

940

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

1046

941

if(debug){

1047

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

1048

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

942

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

1049

943

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

1050

944

ip, (intmax_t)interface, port);

1051

945

}

1053

947

avahi_proto_to_af(proto));

1054

948

if(ret == 0){

1055

949

avahi_simple_poll_quit(mc.simple_poll);

1056

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

1059

950

}

1060

951

}

1061

952

}

1085

976

default:

1086

977

case AVAHI_BROWSER_FAILURE:

1087

978

1088

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

1089

"(Avahi browser) %s\n",

979

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

1090

980

avahi_strerror(avahi_server_errno(mc.server)));

1091

981

avahi_simple_poll_quit(mc.simple_poll);

1092

982

return;

1100

990

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

1101

991

name, type, domain, protocol, 0,

1102

992

resolve_callback, NULL) == NULL)

1103

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

1104

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

993

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

1105

994

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

1106

995

break;

1107

996

1111

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1112

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1113

1002

if(debug){

1114

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

1115

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

1003

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

1116

1004

}

1117

1005

break;

1118

1006

}

1119

1007

}

1120

1008

1121

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

1009

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

1122

1010

static void handle_sigterm(int sig){

1123

1011

if(quit_now){

1124

1012

return;

1126

1014

quit_now = 1;

1127

1015

signal_received = sig;

1128

1016

int old_errno = errno;

1129

/* set main loop to exit */

1130

1017

if(mc.simple_poll != NULL){

1131

1018

avahi_simple_poll_quit(mc.simple_poll);

1132

1019

}

1133

1020

errno = old_errno;

1134

1021

}

1135

1022

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){

1147

if(debug){

1148

perror_plus("ioctl SIOCGIFFLAGS");

1149

}

1150

return false;

1151

}

1152

return true;

1153

}

1154

1155

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

1156

1157

/* Reject the loopback device */

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

if(debug){

1160

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

1161

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

1162

}

1163

return false;

1164

}

1165

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

1166

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

1167

if(debug){

1168

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

1169

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

1170

}

1171

return true;

1172

}

1173

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

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

1190

/* Accept this device */

1191

if(debug){

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

}

1396

}

1397

1398

1023

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

1399

1024

AvahiSServiceBrowser *sb = NULL;

1400

1025

int error;

1402

1027

intmax_t tmpmax;

1403

1028

char *tmp;

1404

1029

int exitcode = EXIT_SUCCESS;

1405

const char *interface = "";

1030

const char *interface = "eth0";

1406

1031

struct ifreq network;

1407

1032

int sd = -1;

1408

1033

bool take_down_interface = false;

1409

1034

uid_t uid;

1410

1035

gid_t gid;

1036

char *connect_to = NULL;

1411

1037

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

1412

1038

bool tempdir_created = false;

1413

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1417

1043

bool gnutls_initialized = false;

1418

1044

bool gpgme_initialized = false;

1419

1045

float delay = 2.5f;

1420

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

1421

retrying the same server again */

1422

1046

1423

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1424

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1430

1054

errno = 0;

1431

1055

ret = setgid(gid);

1432

1056

if(ret == -1){

1433

perror_plus("setgid");

1057

perror("setgid");

1434

1058

}

1435

1059

1436

1060

/* Lower user privileges (temporarily) */

1437

1061

errno = 0;

1438

1062

ret = seteuid(uid);

1439

1063

if(ret == -1){

1440

perror_plus("seteuid");

1064

perror("seteuid");

1441

1065

}

1442

1066

1443

1067

if(quit_now){

1478

1102

.arg = "SECONDS",

1479

1103

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

1480

1104

.group = 2 },

1481

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

1482

.arg = "SECONDS",

1483

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

1484

.group = 2 },

1485

1105

/*

1486

1106

* These reproduce what we would get without ARGP_NO_HELP

1487

1107

*/

1531

1151

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

1532

1152

argp_error(state, "Bad delay");

1533

1153

}

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

}

1542

1154

break;

1543

1155

/*

1544

1156

* These reproduce what we would get without ARGP_NO_HELP

1551

1163

argp_state_help(state, state->out_stream,

1552

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

1165

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

1554

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

1555

1166

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

1556

1167

exit(argp_err_exit_status);

1557

1168

break;

1573

1184

case ENOMEM:

1574

1185

default:

1575

1186

errno = ret;

1576

perror_plus("argp_parse");

1187

perror("argp_parse");

1577

1188

exitcode = EX_OSERR;

1578

1189

goto end;

1579

1190

case EINVAL:

1581

1192

goto end;

1582

1193

}

1583

1194

}

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

}

1739

1195

1740

1196

if(not debug){

1741

1197

avahi_set_log_function(empty_log);

1742

1198

}

1743

1199

1744

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

1745

struct dirent **direntries;

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

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

}

1755

if(ret >= 1){

1756

/* Pick the first interface returned */

1757

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

1758

if(debug){

1759

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

1760

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

1761

}

1762

if(interface == NULL){

1763

perror_plus("malloc");

1764

free(direntries);

1765

exitcode = EXIT_FAILURE;

1766

goto end;

1767

}

1768

free(direntries);

1769

} else {

1770

free(direntries);

1771

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

1772

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

1773

exitcode = EXIT_FAILURE;

1774

goto end;

1775

}

1776

}

1777

1778

1200

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

1779

1201

from the signal handler */

1780

1202

/* Initialize the pseudo-RNG for Avahi */

1781

1203

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

1782

1204

mc.simple_poll = avahi_simple_poll_new();

1783

1205

if(mc.simple_poll == NULL){

1784

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

1785

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

1206

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

1786

1207

exitcode = EX_UNAVAILABLE;

1787

1208

goto end;

1788

1209

}

1790

1211

sigemptyset(&sigterm_action.sa_mask);

1791

1212

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

1792

1213

if(ret == -1){

1793

perror_plus("sigaddset");

1214

perror("sigaddset");

1794

1215

exitcode = EX_OSERR;

1795

1216

goto end;

1796

1217

}

1797

1218

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

1798

1219

if(ret == -1){

1799

perror_plus("sigaddset");

1220

perror("sigaddset");

1800

1221

exitcode = EX_OSERR;

1801

1222

goto end;

1802

1223

}

1803

1224

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

1804

1225

if(ret == -1){

1805

perror_plus("sigaddset");

1226

perror("sigaddset");

1806

1227

exitcode = EX_OSERR;

1807

1228

goto end;

1808

1229

}

1812

1233

*/

1813

1234

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

1814

1235

if(ret == -1){

1815

perror_plus("sigaction");

1236

perror("sigaction");

1816

1237

return EX_OSERR;

1817

1238

}

1818

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1819

1240

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

1820

1241

if(ret == -1){

1821

perror_plus("sigaction");

1242

perror("sigaction");

1822

1243

exitcode = EX_OSERR;

1823

1244

goto end;

1824

1245

}

1825

1246

}

1826

1247

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

1827

1248

if(ret == -1){

1828

perror_plus("sigaction");

1249

perror("sigaction");

1829

1250

return EX_OSERR;

1830

1251

}

1831

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1832

1253

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

1833

1254

if(ret == -1){

1834

perror_plus("sigaction");

1255

perror("sigaction");

1835

1256

exitcode = EX_OSERR;

1836

1257

goto end;

1837

1258

}

1838

1259

}

1839

1260

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

1840

1261

if(ret == -1){

1841

perror_plus("sigaction");

1262

perror("sigaction");

1842

1263

return EX_OSERR;

1843

1264

}

1844

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1845

1266

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

1846

1267

if(ret == -1){

1847

perror_plus("sigaction");

1268

perror("sigaction");

1848

1269

exitcode = EX_OSERR;

1849

1270

goto end;

1850

1271

}

1851

1272

}

1852

1273

1853

1274

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

1854

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

1275

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

1855

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

1277

if(if_index == 0){

1857

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

1858

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

1278

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

1859

1279

exitcode = EX_UNAVAILABLE;

1860

1280

goto end;

1861

1281

}

1868

1288

errno = 0;

1869

1289

ret = seteuid(0);

1870

1290

if(ret == -1){

1871

perror_plus("seteuid");

1291

perror("seteuid");

1872

1292

}

1873

1293

1874

1294

#ifdef __linux__

1878

1298

bool restore_loglevel = true;

1879

1299

if(ret == -1){

1880

1300

restore_loglevel = false;

1881

perror_plus("klogctl");

1301

perror("klogctl");

1882

1302

}

1883

1303

#endif /* __linux__ */

1884

1304

1885

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1886

1306

if(sd < 0){

1887

perror_plus("socket");

1307

perror("socket");

1888

1308

exitcode = EX_OSERR;

1889

1309

#ifdef __linux__

1890

1310

if(restore_loglevel){

1891

1311

ret = klogctl(7, NULL, 0);

1892

1312

if(ret == -1){

1893

perror_plus("klogctl");

1313

perror("klogctl");

1894

1314

}

1895

1315

}

1896

1316

#endif /* __linux__ */

1898

1318

errno = 0;

1899

1319

ret = seteuid(uid);

1900

1320

if(ret == -1){

1901

perror_plus("seteuid");

1321

perror("seteuid");

1902

1322

}

1903

1323

goto end;

1904

1324

}

1905

1325

strcpy(network.ifr_name, interface);

1906

1326

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

1907

1327

if(ret == -1){

1908

perror_plus("ioctl SIOCGIFFLAGS");

1328

perror("ioctl SIOCGIFFLAGS");

1909

1329

#ifdef __linux__

1910

1330

if(restore_loglevel){

1911

1331

ret = klogctl(7, NULL, 0);

1912

1332

if(ret == -1){

1913

perror_plus("klogctl");

1333

perror("klogctl");

1914

1334

}

1915

1335

}

1916

1336

#endif /* __linux__ */

1919

1339

errno = 0;

1920

1340

ret = seteuid(uid);

1921

1341

if(ret == -1){

1922

perror_plus("seteuid");

1342

perror("seteuid");

1923

1343

}

1924

1344

goto end;

1925

1345

}

1929

1349

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

1930

1350

if(ret == -1){

1931

1351

take_down_interface = false;

1932

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1352

perror("ioctl SIOCSIFFLAGS");

1933

1353

exitcode = EX_OSERR;

1934

1354

#ifdef __linux__

1935

1355

if(restore_loglevel){

1936

1356

ret = klogctl(7, NULL, 0);

1937

1357

if(ret == -1){

1938

perror_plus("klogctl");

1358

perror("klogctl");

1939

1359

}

1940

1360

}

1941

1361

#endif /* __linux__ */

1943

1363

errno = 0;

1944

1364

ret = seteuid(uid);

1945

1365

if(ret == -1){

1946

perror_plus("seteuid");

1366

perror("seteuid");

1947

1367

}

1948

1368

goto end;

1949

1369

}

1950

1370

}

1951

/* Sleep checking until interface is running.

1952

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

1371

/* sleep checking until interface is running */

1953

1372

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

1954

1373

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

1955

1374

if(ret == -1){

1956

perror_plus("ioctl SIOCGIFFLAGS");

1375

perror("ioctl SIOCGIFFLAGS");

1957

1376

} else if(network.ifr_flags & IFF_RUNNING){

1958

1377

break;

1959

1378

}

1960

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1961

1380

ret = nanosleep(&sleeptime, NULL);

1962

1381

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

1963

perror_plus("nanosleep");

1382

perror("nanosleep");

1964

1383

}

1965

1384

}

1966

1385

if(not take_down_interface){

1967

1386

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

1968

1387

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

1969

1388

if(ret == -1){

1970

perror_plus("close");

1389

perror("close");

1971

1390

}

1972

1391

}

1973

1392

#ifdef __linux__

1975

1394

/* Restores kernel loglevel to default */

1976

1395

ret = klogctl(7, NULL, 0);

1977

1396

if(ret == -1){

1978

perror_plus("klogctl");

1397

perror("klogctl");

1979

1398

}

1980

1399

}

1981

1400

#endif /* __linux__ */

1985

1404

/* Lower privileges */

1986

1405

ret = seteuid(uid);

1987

1406

if(ret == -1){

1988

perror_plus("seteuid");

1407

perror("seteuid");

1989

1408

}

1990

1409

} else {

1991

1410

/* Lower privileges permanently */

1992

1411

ret = setuid(uid);

1993

1412

if(ret == -1){

1994

perror_plus("setuid");

1413

perror("setuid");

1995

1414

}

1996

1415

}

1997

1416

}

2002

1421

2003

1422

ret = init_gnutls_global(pubkey, seckey);

2004

1423

if(ret == -1){

2005

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

2006

"init_gnutls_global failed\n");

1424

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

2007

1425

exitcode = EX_UNAVAILABLE;

2008

1426

goto end;

2009

1427

} else {

2014

1432

goto end;

2015

1433

}

2016

1434

1435

tempdir_created = true;

2017

1436

if(mkdtemp(tempdir) == NULL){

2018

perror_plus("mkdtemp");

1437

tempdir_created = false;

1438

perror("mkdtemp");

2019

1439

goto end;

2020

1440

}

2021

tempdir_created = true;

2022

1441

2023

1442

if(quit_now){

2024

1443

goto end;

2025

1444

}

2026

1445

2027

1446

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

2028

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

2029

"init_gpgme failed\n");

1447

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

2030

1448

exitcode = EX_UNAVAILABLE;

2031

1449

goto end;

2032

1450

} else {

2042

1460

/* (Mainly meant for debugging) */

2043

1461

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

2044

1462

if(address == NULL){

2045

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

2046

"No colon in address\n");

1463

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

2047

1464

exitcode = EX_USAGE;

2048

1465

goto end;

2049

1466

}

2057

1474

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

2058

1475

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

2059

1476

or tmpmax != (uint16_t)tmpmax){

2060

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

2061

"Bad port number\n");

1477

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

2062

1478

exitcode = EX_USAGE;

2063

1479

goto end;

2064

1480

}

2069

1485

2070

1486

port = (uint16_t)tmpmax;

2071

1487

*address = '\0';

1488

address = connect_to;

2072

1489

/* Colon in address indicates IPv6 */

2073

1490

int af;

2074

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

1491

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

2075

1492

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

}

2082

1493

} else {

2083

1494

af = AF_INET;

2084

1495

}

2085

address = connect_to;

2086

1496

2087

1497

if(quit_now){

2088

1498

goto end;

2089

1499

}

2090

1500

2091

while(not quit_now){

2092

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

2093

if(quit_now or ret == 0){

2094

break;

2095

}

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

2103

if (not quit_now){

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 {

2104

1523

exitcode = EXIT_SUCCESS;

2105

1524

}

2106

2107

1525

goto end;

2108

1526

}

2109

1527

2131

1549

2132

1550

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

2133

1551

if(mc.server == NULL){

2134

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

2135

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

1552

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

2136

1553

avahi_strerror(error));

2137

1554

exitcode = EX_UNAVAILABLE;

2138

1555

goto end;

2147

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2148

1565

NULL, 0, browse_callback, NULL);

2149

1566

if(sb == NULL){

2150

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

2151

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

1567

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

2152

1568

avahi_strerror(avahi_server_errno(mc.server)));

2153

1569

exitcode = EX_UNAVAILABLE;

2154

1570

goto end;

2161

1577

/* Run the main loop */

2162

1578

2163

1579

if(debug){

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

}

1580

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

1581

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2175

1584

2176

1585

end:

2177

1586

2178

1587

if(debug){

2179

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

2180

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

1588

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

2181

1589

}

2182

1590

2183

1591

/* Cleanup things */

2199

1607

if(gpgme_initialized){

2200

1608

gpgme_release(mc.ctx);

2201

1609

}

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 */

2215

1610

2216

1611

/* Take down the network interface */

2217

1612

if(take_down_interface){

2219

1614

errno = 0;

2220

1615

ret = seteuid(0);

2221

1616

if(ret == -1){

2222

perror_plus("seteuid");

1617

perror("seteuid");

2223

1618

}

2224

1619

if(geteuid() == 0){

2225

1620

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

2226

1621

if(ret == -1){

2227

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

2229

1624

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

2230

1625

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

2231

1626

if(ret == -1){

2232

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1627

perror("ioctl SIOCSIFFLAGS");

2233

1628

}

2234

1629

}

2235

1630

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

2236

1631

if(ret == -1){

2237

perror_plus("close");

1632

perror("close");

2238

1633

}

2239

1634

/* Lower privileges permanently */

2240

1635

errno = 0;

2241

1636

ret = setuid(uid);

2242

1637

if(ret == -1){

2243

perror_plus("setuid");

1638

perror("setuid");

2244

1639

}

2245

1640

}

2246

1641

}

2247

1642

2248

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

1643

/* Removes the temp directory used by GPGME */

2249

1644

if(tempdir_created){

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];

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

}

2257

1665

char *fullname = NULL;

2258

1666

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

2259

1667

direntry->d_name);

2260

1668

if(ret < 0){

2261

perror_plus("asprintf");

1669

perror("asprintf");

2262

1670

continue;

2263

1671

}

2264

1672

ret = remove(fullname);

2265

1673

if(ret == -1){

2266

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

2267

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

1674

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

1675

strerror(errno));

2268

1676

}

2269

1677

free(fullname);

2270

1678

}

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");

1679

closedir(d);

2277

1680

}

2278

1681

ret = rmdir(tempdir);

2279

1682

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

2280

perror_plus("rmdir");

1683

perror("rmdir");

2281

1684

}

2282

1685

}

2283

1686

2288

1691

&old_sigterm_action,

2289

1692

NULL));

2290

1693

if(ret == -1){

2291

perror_plus("sigaction");

1694

perror("sigaction");

2292

1695

}

2293

1696

do {

2294

1697

ret = raise(signal_received);

2295

1698

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

2296

1699

if(ret != 0){

2297

perror_plus("raise");

1700

perror("raise");

2298

1701

abort();

2299

1702

}

2300

1703

TEMP_FAILURE_RETRY(pause());