/mandos/release : revision 237.7.104

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, program_invocation_short_name */

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

72

73

*/

73

74

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

74

75

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

75

setgid(), pause() */

76

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

76

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

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() */

90

#include <grp.h> /* setgroups() */

87

91

88

92

#ifdef __linux__

89

93

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

107

111

init_gnutls_session(),

108

112

GNUTLS_* */

109

113

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

117

/* GPGME */

114

118

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

122

126

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

123

127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

129

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

125

130

126

131

bool debug = false;

127

132

static const char mandos_protocol_version[] = "1";

128

133

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

129

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

134

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

130

135

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

131

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

132

138

133

/* Doubly linked list that need to be circular linked when ever used */

139

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

134

140

typedef struct server{

135

141

const char *ip;

136

142

uint16_t port;

156

162

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

157

163

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

158

164

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

165

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

166

.current_server = NULL };

160

167

161

168

sig_atomic_t quit_now = 0;

162

169

int signal_received = 0;

163

170

164

171

/* Function to use when printing errors */

165

172

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

173

int e = errno;

174

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

175

program_invocation_short_name);

176

errno = e;

167

177

perror(print_text);

168

178

}

169

179

180

__attribute__((format (gnu_printf, 2, 3)))

181

int fprintf_plus(FILE *stream, const char *format, ...){

182

va_list ap;

183

va_start (ap, format);

184

185

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

186

program_invocation_short_name));

187

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

188

}

189

170

190

/*

171

191

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

172

192

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

173

193

* "buffer_length" is how much is already used.

174

194

*/

175

195

size_t incbuffer(char **buffer, size_t buffer_length,

176

size_t buffer_capacity){

196

size_t buffer_capacity){

177

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

178

198

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

179

199

if(buffer == NULL){

184

204

return buffer_capacity;

185

205

}

186

206

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

207

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

208

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

209

int af){

190

210

int ret;

191

211

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

192

212

if(new_server == NULL){

193

213

perror_plus("malloc");

194

return -1;

214

return false;

195

215

}

196

216

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

217

.port = port,

218

.if_index = if_index,

219

.af = af };

200

220

if(new_server->ip == NULL){

201

221

perror_plus("strdup");

202

return -1;

222

return false;

203

223

}

204

/* uniqe case of first server */

224

/* Special case of first server */

205

225

if (mc.current_server == NULL){

206

226

new_server->next = new_server;

207

227

new_server->prev = new_server;

208

228

mc.current_server = new_server;

209

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

229

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

210

230

} else {

211

231

new_server->next = mc.current_server;

212

232

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

216

236

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

217

237

if(ret == -1){

218

238

perror_plus("clock_gettime");

219

return -1;

239

return false;

220

240

}

221

return 0;

241

return true;

222

242

}

223

243

224

244

/*

225

245

* Initialize GPGME.

226

246

*/

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

229

249

gpgme_error_t rc;

230

250

gpgme_engine_info_t engine_info;

231

251

246

266

247

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

248

268

if(rc != GPG_ERR_NO_ERROR){

249

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

250

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

251

271

return false;

252

272

}

253

273

254

274

rc = gpgme_op_import(mc.ctx, pgp_data);

255

275

if(rc != GPG_ERR_NO_ERROR){

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

258

278

return false;

259

279

}

260

280

267

287

}

268

288

269

289

if(debug){

270

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

290

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

271

291

}

272

292

273

293

/* Init GPGME */

274

294

gpgme_check_version(NULL);

275

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

276

296

if(rc != GPG_ERR_NO_ERROR){

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

279

299

return false;

280

300

}

281

301

282

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

302

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

283

303

rc = gpgme_get_engine_info(&engine_info);

284

304

if(rc != GPG_ERR_NO_ERROR){

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

287

307

return false;

288

308

}

289

309

while(engine_info != NULL){

295

315

engine_info = engine_info->next;

296

316

}

297

317

if(engine_info == NULL){

298

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

318

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

319

tempdir);

299

320

return false;

300

321

}

301

322

302

323

/* Create new GPGME "context" */

303

324

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

304

325

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

307

329

return false;

308

330

}

309

331

328

350

ssize_t plaintext_length = 0;

329

351

330

352

if(debug){

331

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

353

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

332

354

}

333

355

334

356

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

335

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

358

0);

337

359

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

340

362

return -1;

341

363

}

342

364

343

365

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

344

366

rc = gpgme_data_new(&dh_plain);

345

367

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

348

371

gpgme_data_release(dh_crypto);

349

372

return -1;

350

373

}

353

376

data buffer */

354

377

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

355

378

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

358

381

plaintext_length = -1;

359

382

if(debug){

360

383

gpgme_decrypt_result_t result;

361

384

result = gpgme_op_decrypt_result(mc.ctx);

362

385

if(result == NULL){

363

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

386

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

364

387

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

369

392

if(result->file_name != NULL){

370

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

393

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

371

394

}

372

395

gpgme_recipient_t recipient;

373

396

recipient = result->recipients;

374

397

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

381

405

recipient = recipient->next;

382

406

}

383

407

}

386

410

}

387

411

388

412

if(debug){

389

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

413

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

390

414

}

391

415

392

416

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

399

423

*plaintext = NULL;

400

424

while(true){

401

425

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

404

428

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

408

432

}

409

433

410

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

447

}

424

448

425

449

if(debug){

426

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

450

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

427

451

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

428

452

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

429

453

}

451

475

/* GnuTLS log function callback */

452

476

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

453

477

const char* string){

454

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

478

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

455

479

}

456

480

457

481

static int init_gnutls_global(const char *pubkeyfilename,

459

483

int ret;

460

484

461

485

if(debug){

462

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

486

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

463

487

}

464

488

465

489

ret = gnutls_global_init();

466

490

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

469

493

return -1;

470

494

}

471

495

478

502

}

479

503

480

504

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

482

506

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

488

509

gnutls_global_deinit();

489

510

return -1;

490

511

}

491

512

492

513

if(debug){

493

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

494

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

495

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

496

518

}

497

519

498

520

ret = gnutls_certificate_set_openpgp_key_file

499

521

(mc.cred, pubkeyfilename, seckeyfilename,

500

522

GNUTLS_OPENPGP_FMT_BASE64);

501

523

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

507

529

goto globalfail;

508

530

}

509

531

510

532

/* GnuTLS server initialization */

511

533

ret = gnutls_dh_params_init(&mc.dh_params);

512

534

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

515

538

goto globalfail;

516

539

}

517

540

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

518

541

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

521

544

goto globalfail;

522

545

}

523

546

543

566

}

544

567

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

545

568

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

548

572

}

549

573

550

574

{

557

581

}

558

582

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

559

583

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

563

587

gnutls_deinit(*session);

564

588

return -1;

565

589

}

574

598

}

575

599

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

576

600

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

579

603

gnutls_deinit(*session);

580

604

return -1;

581

605

}

626

650

pf = PF_INET;

627

651

break;

628

652

default:

629

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

653

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

630

654

errno = EINVAL;

631

655

return -1;

632

656

}

637

661

}

638

662

639

663

if(debug){

640

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

641

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

642

666

}

643

667

644

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

694

}

671

695

if(ret == 0){

672

696

int e = errno;

673

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

697

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

674

698

errno = e;

675

699

goto mandos_end;

676

700

}

681

705

682

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

707

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

684

-Wunreachable-code*/

708

-Wunreachable-code*/

685

709

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

688

712

errno = EINVAL;

689

713

goto mandos_end;

690

714

}

708

732

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

709

733

perror_plus("if_indextoname");

710

734

} else {

711

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

712

ip, interface, port);

735

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

736

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

713

737

}

714

738

} else {

715

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

716

port);

739

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

740

ip, port);

717

741

}

718

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

753

perror_plus("inet_ntop");

730

754

} else {

731

755

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

732

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

756

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

733

757

}

734

758

}

735

759

}

763

787

while(true){

764

788

size_t out_size = strlen(out);

765

789

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

766

out_size - written));

790

out_size - written));

767

791

if(ret == -1){

768

792

int e = errno;

769

793

perror_plus("write");

789

813

}

790

814

791

815

if(debug){

792

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

816

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

793

817

}

794

818

795

819

if(quit_now){

796

820

errno = EINTR;

797

821

goto mandos_end;

798

822

}

799

800

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

823

824

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

801

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

826

803

827

if(quit_now){

815

839

816

840

if(ret != GNUTLS_E_SUCCESS){

817

841

if(debug){

818

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

842

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

819

843

gnutls_perror(ret);

820

844

}

821

845

errno = EPROTO;

825

849

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

826

850

827

851

if(debug){

828

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

829

ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

830

854

}

831

855

832

856

while(true){

837

861

}

838

862

839

863

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

864

buffer_capacity);

841

865

if(buffer_capacity == 0){

842

866

int e = errno;

843

867

perror_plus("incbuffer");

870

894

}

871

895

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

872

896

if(ret < 0){

873

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

897

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

898

"***\n");

874

899

gnutls_perror(ret);

875

900

errno = EPROTO;

876

901

goto mandos_end;

877

902

}

878

903

break;

879

904

default:

880

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

881

" encrypted session with Mandos server\n");

905

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

906

" encrypted session with Mandos server\n");

882

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

908

errno = EIO;

884

909

goto mandos_end;

889

914

}

890

915

891

916

if(debug){

892

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

917

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

893

918

}

894

919

895

920

if(quit_now){

907

932

908

933

if(buffer_length > 0){

909

934

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

936

&decrypted_buffer);

913

937

if(decrypted_buffer_size >= 0){

914

938

925

949

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

926

950

int e = errno;

927

951

if(debug){

928

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

929

strerror(errno));

952

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

953

strerror(errno));

930

954

}

931

955

errno = e;

932

956

goto mandos_end;

989

1013

switch(event){

990

1014

default:

991

1015

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1016

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

995

1020

break;

996

1021

997

1022

case AVAHI_RESOLVER_FOUND:

999

1024

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1025

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

1001

1026

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1027

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

1028

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

1029

host_name, ip, (intmax_t)interface, port);

1005

1030

}

1006

1031

int ret = start_mandos_communication(ip, port, interface,

1007

1032

avahi_proto_to_af(proto));

1008

1033

if(ret == 0){

1009

1034

avahi_simple_poll_quit(mc.simple_poll);

1010

1035

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1039

" list\n", name);

1040

}

1013

1041

}

1014

1042

}

1015

1043

}

1039

1067

default:

1040

1068

case AVAHI_BROWSER_FAILURE:

1041

1069

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1044

1072

avahi_simple_poll_quit(mc.simple_poll);

1045

1073

return;

1046

1074

1053

1081

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

1054

1082

name, type, domain, protocol, 0,

1055

1083

resolve_callback, NULL) == NULL)

1056

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

1057

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

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1058

1087

break;

1059

1088

1060

1089

case AVAHI_BROWSER_REMOVE:

1063

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1094

if(debug){

1066

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

1095

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

1096

" searching...\n");

1067

1097

}

1068

1098

break;

1069

1099

}

1070

1100

}

1071

1101

1072

/* Signal handler that stops main loop after sigterm has been called */

1102

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

1073

1103

static void handle_sigterm(int sig){

1074

1104

if(quit_now){

1075

1105

return;

1084

1114

errno = old_errno;

1085

1115

}

1086

1116

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1143

1128

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1129

perror_plus("ioctl SIOCGIFFLAGS");

1146

1130

}

1147

free(flagstring);

1148

return 0;

1131

return false;

1149

1132

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1133

return true;

1134

}

1135

1136

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

1137

1152

1138

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1140

if(debug){

1155

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

1156

if_entry->d_name);

1141

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

1142

ifname);

1157

1143

}

1158

return 0;

1144

return false;

1159

1145

}

1160

1146

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

1161

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

1147

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

1162

1148

if(debug){

1163

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

1164

if_entry->d_name);

1149

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

1150

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

1165

1151

}

1166

return 1;

1152

return true;

1167

1153

}

1168

1154

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

1169

if(not (flags & IFF_BROADCAST)){

1155

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

1170

1156

if(debug){

1171

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

1172

if_entry->d_name);

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1173

1159

}

1174

return 0;

1160

return false;

1175

1161

}

1176

1162

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

1177

if(flags & IFF_NOARP){

1163

if(ifr->ifr_flags & IFF_NOARP){

1178

1164

if(debug){

1179

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

1180

if_entry->d_name);

1165

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

1166

ifname);

1181

1167

}

1182

return 0;

1168

return false;

1183

1169

}

1170

1184

1171

/* Accept this device */

1185

1172

if(debug){

1186

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

1187

if_entry->d_name);

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

fprintf_plus(stderr, "Failed to get flags for interface "

1192

"\"%s\"\n", if_entry->d_name);

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

fprintf_plus(stderr, "Failed to get flags for interface "

1217

"\"%s\"\n", if_entry->d_name);

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1188

1242

}

1189

1243

return 1;

1190

1244

}

1200

1254

return 1;

1201

1255

}

1202

1256

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1203

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1319

int ret;

1205

1320

struct timespec now;

1206

1321

struct timespec waited_time;

1207

1322

intmax_t block_time;

1208

1323

1209

1324

while(true){

1210

1325

if(mc.current_server == NULL){

1211

1326

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1327

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

1328

" No timeout!\n");

1213

1329

}

1214

1330

ret = avahi_simple_poll_iterate(s, -1);

1215

1331

} else {

1216

1332

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1333

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

1334

" it, or wait\n");

1218

1335

}

1219

1336

/* the current time */

1220

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1341

}

1225

1342

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

1226

1343

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1344

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1346

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1348

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

1349

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

1350

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

1351

block_time = ((retry_interval

1352

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

1353

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

1354

1232

1355

if (debug){

1233

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

1356

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

1357

block_time);

1234

1358

}

1235

1359

1236

1360

if(block_time <= 0){

1237

1361

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1241

1365

if(ret == 0){

1242

1366

avahi_simple_poll_quit(mc.simple_poll);

1243

1367

return 0;

1244

1368

}

1245

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

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1246

1371

if(ret == -1){

1247

1372

perror_plus("clock_gettime");

1248

1373

return -1;

1249

1374

}

1250

1375

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1376

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

1377

servers, but don't block */

1252

1378

}

1253

1379

1254

1380

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

1255

1381

}

1256

1382

if(ret != 0){

1257

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

1383

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

1258

1384

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

1259

1385

}

1260

1386

}

1261

1387

}

1262

1388

}

1263

1389

1390

bool run_network_hooks(const char *mode, const char *interface,

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

ret = setenv("CONNECT", connect_to, 1);

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

fprintf_plus(stderr, "Warning: network hook \"%s\""

1510

" crashed\n", direntry->d_name);

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1264

1526

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

1265

1527

AvahiSServiceBrowser *sb = NULL;

1266

1528

int error;

1283

1545

bool gnutls_initialized = false;

1284

1546

bool gpgme_initialized = false;

1285

1547

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1548

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

1549

retrying the same server again */

1287

1550

1288

1551

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1552

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1345

1608

.group = 2 },

1346

1609

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

1347

1610

.arg = "SECONDS",

1348

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

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1349

1616

.group = 2 },

1350

1617

/*

1351

1618

* These reproduce what we would get without ARGP_NO_HELP

1400

1667

errno = 0;

1401

1668

retry_interval = strtod(arg, &tmp);

1402

1669

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

1403

or (retry_interval * 1000) > INT_MAX){

1670

or (retry_interval * 1000) > INT_MAX

1671

or retry_interval < 0){

1404

1672

argp_error(state, "Bad retry interval");

1405

1673

}

1406

1674

break;

1675

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

1676

hookdir = arg;

1677

break;

1407

1678

/*

1408

1679

* These reproduce what we would get without ARGP_NO_HELP

1409

1680

*/

1415

1686

argp_state_help(state, state->out_stream,

1416

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

1688

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

1418

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

1689

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

1419

1690

exit(argp_err_exit_status);

1420

1691

break;

1421

1692

default:

1444

1715

goto end;

1445

1716

}

1446

1717

}

1718

1719

{

1720

/* Work around Debian bug #633582:

1721

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

1722

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

and st.st_uid == 0 and st.st_gid == 0){

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

and st.st_uid == 0 and st.st_gid == 0){

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

if(not run_network_hooks("start", interface, delay)){

1784

goto end;

1785

}

1447

1786

1448

1787

if(not debug){

1449

1788

avahi_set_log_function(empty_log);

1450

1789

}

1451

1790

1452

1791

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

1453

1792

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1455

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1456

1802

if(ret >= 1){

1457

/* Pick the first good interface */

1803

/* Pick the first interface returned */

1458

1804

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

1459

1805

if(debug){

1460

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

1806

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

1461

1807

}

1462

1808

if(interface == NULL){

1463

1809

perror_plus("malloc");

1468

1814

free(direntries);

1469

1815

} else {

1470

1816

free(direntries);

1471

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

1817

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

1472

1818

exitcode = EXIT_FAILURE;

1473

1819

goto end;

1474

1820

}

1480

1826

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

1481

1827

mc.simple_poll = avahi_simple_poll_new();

1482

1828

if(mc.simple_poll == NULL){

1483

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

1829

fprintf_plus(stderr,

1830

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

1484

1831

exitcode = EX_UNAVAILABLE;

1485

1832

goto end;

1486

1833

}

1552

1899

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

1553

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

1901

if(if_index == 0){

1555

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

1902

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

1556

1903

exitcode = EX_UNAVAILABLE;

1557

1904

goto end;

1558

1905

}

1645

1992

goto end;

1646

1993

}

1647

1994

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1995

/* Sleep checking until interface is running.

1996

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

1649

1997

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

1650

1998

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

1651

1999

if(ret == -1){

1677

2025

#endif /* __linux__ */

1678

2026

/* Lower privileges */

1679

2027

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1692

2032

}

1693

2033

}

1694

2034

1698

2038

1699

2039

ret = init_gnutls_global(pubkey, seckey);

1700

2040

if(ret == -1){

1701

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

2041

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

1702

2042

exitcode = EX_UNAVAILABLE;

1703

2043

goto end;

1704

2044

} else {

1720

2060

}

1721

2061

1722

2062

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

1723

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

2063

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

1724

2064

exitcode = EX_UNAVAILABLE;

1725

2065

goto end;

1726

2066

} else {

1736

2076

/* (Mainly meant for debugging) */

1737

2077

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

1738

2078

if(address == NULL){

1739

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

2079

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

1740

2080

exitcode = EX_USAGE;

1741

2081

goto end;

1742

2082

}

1750

2090

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

1751

2091

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

1752

2092

or tmpmax != (uint16_t)tmpmax){

1753

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

2093

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

1754

2094

exitcode = EX_USAGE;

1755

2095

goto end;

1756

2096

}

1761

2101

1762

2102

port = (uint16_t)tmpmax;

1763

2103

*address = '\0';

1764

address = connect_to;

1765

2104

/* Colon in address indicates IPv6 */

1766

2105

int af;

1767

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

2106

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

1768

2107

af = AF_INET6;

2108

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

2109

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

2110

{

2111

connect_to++;

2112

address[-1] = '\0';

2113

}

1769

2114

} else {

1770

2115

af = AF_INET;

1771

2116

}

2117

address = connect_to;

1772

2118

1773

2119

if(quit_now){

1774

2120

goto end;

1775

2121

}

1776

2122

1777

2123

while(not quit_now){

1778

2124

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

1779

2125

if(quit_now or ret == 0){

1780

2126

break;

1781

2127

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

2128

if(debug){

2129

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

2130

(int)retry_interval);

2131

}

2132

sleep((int)retry_interval);

2133

}

2134

1785

2135

if (not quit_now){

1786

2136

exitcode = EXIT_SUCCESS;

1787

2137

}

1788

2138

1789

2139

goto end;

1790

2140

}

1791

2141

1813

2163

1814

2164

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

1815

2165

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2166

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

2167

avahi_strerror(error));

1818

2168

exitcode = EX_UNAVAILABLE;

1819

2169

goto end;

1820

2170

}

1828

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

2179

NULL, 0, browse_callback, NULL);

1830

2180

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

1833

2183

exitcode = EX_UNAVAILABLE;

1834

2184

goto end;

1835

2185

}

1841

2191

/* Run the main loop */

1842

2192

1843

2193

if(debug){

1844

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

2194

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

1845

2195

}

1846

2196

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

1848

2199

if(debug){

1849

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

1850

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

2200

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

2201

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

1851

2202

}

1852

2203

1853

2204

end:

1854

2205

1855

2206

if(debug){

1856

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

2207

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

1857

2208

}

1858

2209

1859

2210

/* Cleanup things */

1875

2226

if(gpgme_initialized){

1876

2227

gpgme_release(mc.ctx);

1877

2228

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

2229

2230

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

2231

has seen */

1880

2232

if(mc.current_server != NULL){

1881

2233

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

1882

2234

while(mc.current_server != NULL){

1886

2238

}

1887

2239

}

1888

2240

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2245

{

1892

2246

errno = 0;

1893

2247

ret = seteuid(0);

1894

2248

if(ret == -1){

1895

2249

perror_plus("seteuid");

1896

2250

}

1897

if(geteuid() == 0){

2251

2252

/* Take down the network interface */

2253

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

1898

2254

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

1899

2255

if(ret == -1){

1900

2256

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

2257

} else if(network.ifr_flags & IFF_UP){

1902

2258

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

1903

2259

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

1904

2260

if(ret == -1){

1909

2265

if(ret == -1){

1910

2266

perror_plus("close");

1911

2267

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

2268

}

1919

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

1920

2276

1921

2277

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

1922

2278

if(tempdir_created){

1923

2279

struct dirent **direntries = NULL;

1924

2280

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

1928

2285

direntry = direntries[i];

1929

2286

char *fullname = NULL;

1930

2287

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

1935

2292

}

1936

2293

ret = remove(fullname);

1937

2294

if(ret == -1){

1938

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

1939

strerror(errno));

2295

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

2296

strerror(errno));

1940

2297

}

1941

2298

free(fullname);

1942

2299

}

1943

2300

}

1944

2301

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

2302

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

1946

2303

free(direntries);

1947

if (ret == -1){

2304

if (numentries == -1){

1948

2305

perror_plus("scandir");

1949

2306

}

1950

2307

ret = rmdir(tempdir);