/mandos/release : revision 237.16.7

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

107

110

init_gnutls_session(),

108

111

GNUTLS_* */

109

112

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

112

115

113

116

/* GPGME */

114

117

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

130

134

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

131

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

132

148

133

149

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

134

150

typedef struct {

139

155

gnutls_dh_params_t dh_params;

140

156

const char *priority;

141

157

gpgme_ctx_t ctx;

158

server *current_server;

142

159

} mandos_context;

143

160

144

161

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

145

162

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

146

163

.dh_bits = 1024, .priority = "SECURE256"

147

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

164

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

165

.current_server = NULL };

148

166

149

167

sig_atomic_t quit_now = 0;

150

168

int signal_received = 0;

151

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

152

177

/*

153

178

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

154

179

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

155

180

* "buffer_length" is how much is already used.

156

181

*/

157

182

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

183

size_t buffer_capacity){

159

184

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

185

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

161

186

if(buffer == NULL){

166

191

return buffer_capacity;

167

192

}

168

193

194

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

195

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

196

int af){

197

int ret;

198

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

199

if(new_server == NULL){

200

perror_plus("malloc");

201

return -1;

202

}

203

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

207

if(new_server->ip == NULL){

208

perror_plus("strdup");

209

return -1;

210

}

211

/* Special case of first server */

212

if (mc.current_server == NULL){

213

new_server->next = new_server;

214

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

217

} else {

218

new_server->next = mc.current_server;

219

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

220

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

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

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

229

}

230

169

231

/*

170

232

* Initialize GPGME.

171

233

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

234

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

235

const char *tempdir){

174

236

gpgme_error_t rc;

175

237

gpgme_engine_info_t engine_info;

176

238

185

247

186

248

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

187

249

if(fd == -1){

188

perror("open");

250

perror_plus("open");

189

251

return false;

190

252

}

191

253

192

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

255

if(rc != GPG_ERR_NO_ERROR){

194

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

256

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

257

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

195

258

gpgme_strsource(rc), gpgme_strerror(rc));

196

259

return false;

197

260

}

198

261

199

262

rc = gpgme_op_import(mc.ctx, pgp_data);

200

263

if(rc != GPG_ERR_NO_ERROR){

201

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

264

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

265

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

202

266

gpgme_strsource(rc), gpgme_strerror(rc));

203

267

return false;

204

268

}

205

269

206

270

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

207

271

if(ret == -1){

208

perror("close");

272

perror_plus("close");

209

273

}

210

274

gpgme_data_release(pgp_data);

211

275

return true;

212

276

}

213

277

214

278

if(debug){

215

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

279

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

280

"Initializing GPGME\n");

216

281

}

217

282

218

283

/* Init GPGME */

219

284

gpgme_check_version(NULL);

220

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

286

if(rc != GPG_ERR_NO_ERROR){

222

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

287

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

288

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

223

289

gpgme_strsource(rc), gpgme_strerror(rc));

224

290

return false;

225

291

}

226

292

227

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

293

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

228

294

rc = gpgme_get_engine_info(&engine_info);

229

295

if(rc != GPG_ERR_NO_ERROR){

230

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

296

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

297

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

231

298

gpgme_strsource(rc), gpgme_strerror(rc));

232

299

return false;

233

300

}

240

307

engine_info = engine_info->next;

241

308

}

242

309

if(engine_info == NULL){

243

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

310

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

311

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

244

312

return false;

245

313

}

246

314

247

315

/* Create new GPGME "context" */

248

316

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

249

317

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

318

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

319

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

320

gpgme_strerror(rc));

252

321

return false;

253

322

}

254

323

273

342

ssize_t plaintext_length = 0;

274

343

275

344

if(debug){

276

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

345

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

346

"Trying to decrypt OpenPGP data\n");

277

347

}

278

348

279

349

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

280

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

351

0);

282

352

if(rc != GPG_ERR_NO_ERROR){

283

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

353

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

354

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

284

355

gpgme_strsource(rc), gpgme_strerror(rc));

285

356

return -1;

286

357

}

288

359

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

289

360

rc = gpgme_data_new(&dh_plain);

290

361

if(rc != GPG_ERR_NO_ERROR){

291

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

362

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

363

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

292

364

gpgme_strsource(rc), gpgme_strerror(rc));

293

365

gpgme_data_release(dh_crypto);

294

366

return -1;

298

370

data buffer */

299

371

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

300

372

if(rc != GPG_ERR_NO_ERROR){

301

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

373

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

374

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

302

375

gpgme_strsource(rc), gpgme_strerror(rc));

303

376

plaintext_length = -1;

304

377

if(debug){

305

378

gpgme_decrypt_result_t result;

306

379

result = gpgme_op_decrypt_result(mc.ctx);

307

380

if(result == NULL){

308

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

381

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

382

"gpgme_op_decrypt_result failed\n");

309

383

} else {

310

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

384

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

385

"Unsupported algorithm: %s\n",

311

386

result->unsupported_algorithm);

312

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

387

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

388

"Wrong key usage: %u\n",

313

389

result->wrong_key_usage);

314

390

if(result->file_name != NULL){

315

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

391

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

392

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

316

393

}

317

394

gpgme_recipient_t recipient;

318

395

recipient = result->recipients;

319

396

while(recipient != NULL){

320

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

397

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

398

"Public key algorithm: %s\n",

321

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

400

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

401

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

402

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

403

"Secret key available: %s\n",

324

404

recipient->status == GPG_ERR_NO_SECKEY

325

405

? "No" : "Yes");

326

406

recipient = recipient->next;

331

411

}

332

412

333

413

if(debug){

334

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

335

416

}

336

417

337

418

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

338

419

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

339

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

340

421

plaintext_length = -1;

341

422

goto decrypt_end;

342

423

}

344

425

*plaintext = NULL;

345

426

while(true){

346

427

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

349

430

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

353

434

}

354

435

355

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

441

break;

361

442

}

362

443

if(ret < 0){

363

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

364

445

plaintext_length = -1;

365

446

goto decrypt_end;

366

447

}

368

449

}

369

450

370

451

if(debug){

371

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

452

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

453

"Decrypted password is: ");

372

454

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

373

455

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

374

456

}

396

478

/* GnuTLS log function callback */

397

479

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

398

480

const char* string){

399

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

481

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

400

482

}

401

483

402

484

static int init_gnutls_global(const char *pubkeyfilename,

404

486

int ret;

405

487

406

488

if(debug){

407

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

489

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

490

"Initializing GnuTLS\n");

408

491

}

409

492

410

493

ret = gnutls_global_init();

411

494

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

495

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

496

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

414

497

return -1;

415

498

}

416

499

425

508

/* OpenPGP credentials */

426

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

510

if(ret != GNUTLS_E_SUCCESS){

428

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

429

safer_gnutls_strerror(ret));

511

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

512

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

430

513

gnutls_global_deinit();

431

514

return -1;

432

515

}

433

516

434

517

if(debug){

435

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

518

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

519

"Attempting to use OpenPGP public key %s and"

436

520

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

437

521

seckeyfilename);

438

522

}

442

526

GNUTLS_OPENPGP_FMT_BASE64);

443

527

if(ret != GNUTLS_E_SUCCESS){

444

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

445

530

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

446

531

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

447

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

448

safer_gnutls_strerror(ret));

532

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

533

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

449

534

goto globalfail;

450

535

}

451

536

452

537

/* GnuTLS server initialization */

453

538

ret = gnutls_dh_params_init(&mc.dh_params);

454

539

if(ret != GNUTLS_E_SUCCESS){

455

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

540

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

541

"Error in GnuTLS DH parameter initialization:"

456

542

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

457

543

goto globalfail;

458

544

}

459

545

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

460

546

if(ret != GNUTLS_E_SUCCESS){

461

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

547

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

548

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

462

549

safer_gnutls_strerror(ret));

463

550

goto globalfail;

464

551

}

485

572

}

486

573

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

487

574

if(ret != GNUTLS_E_SUCCESS){

488

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

575

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

576

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

489

577

safer_gnutls_strerror(ret));

490

578

}

491

579

499

587

}

500

588

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

501

589

if(ret != GNUTLS_E_SUCCESS){

502

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

503

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

504

safer_gnutls_strerror(ret));

590

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

591

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

592

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

593

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

505

594

gnutls_deinit(*session);

506

595

return -1;

507

596

}

516

605

}

517

606

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

518

607

if(ret != GNUTLS_E_SUCCESS){

519

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

608

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

609

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

520

610

safer_gnutls_strerror(ret));

521

611

gnutls_deinit(*session);

522

612

return -1;

568

658

pf = PF_INET;

569

659

break;

570

660

default:

571

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

661

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

662

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

572

663

errno = EINVAL;

573

664

return -1;

574

665

}

579

670

}

580

671

581

672

if(debug){

582

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

673

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

674

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

583

675

"\n", ip, port);

584

676

}

585

677

586

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

679

if(tcp_sd < 0){

588

680

int e = errno;

589

perror("socket");

681

perror_plus("socket");

590

682

errno = e;

591

683

goto mandos_end;

592

684

}

606

698

}

607

699

if(ret < 0 ){

608

700

int e = errno;

609

perror("inet_pton");

701

perror_plus("inet_pton");

610

702

errno = e;

611

703

goto mandos_end;

612

704

}

613

705

if(ret == 0){

614

706

int e = errno;

615

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

707

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

708

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

616

709

errno = e;

617

710

goto mandos_end;

618

711

}

623

716

624

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

625

718

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

626

-Wunreachable-code*/

719

-Wunreachable-code*/

627

720

if(if_index == AVAHI_IF_UNSPEC){

628

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

721

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

722

"An IPv6 link-local address is incomplete"

629

723

" without a network interface\n");

630

724

errno = EINVAL;

631

725

goto mandos_end;

648

742

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

649

743

char interface[IF_NAMESIZE];

650

744

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

651

perror("if_indextoname");

745

perror_plus("if_indextoname");

652

746

} else {

653

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

747

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

748

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

654

749

ip, interface, port);

655

750

}

656

751

} else {

657

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

658

port);

752

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

753

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

659

754

}

660

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

661

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

668

763

sizeof(addrstr));

669

764

}

670

765

if(pcret == NULL){

671

perror("inet_ntop");

766

perror_plus("inet_ntop");

672

767

} else {

673

768

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

674

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

769

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

770

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

675

771

}

676

772

}

677

773

}

689

785

if(ret < 0){

690

786

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

691

787

int e = errno;

692

perror("connect");

788

perror_plus("connect");

693

789

errno = e;

694

790

}

695

791

goto mandos_end;

705

801

while(true){

706

802

size_t out_size = strlen(out);

707

803

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

708

out_size - written));

804

out_size - written));

709

805

if(ret == -1){

710

806

int e = errno;

711

perror("write");

807

perror_plus("write");

712

808

errno = e;

713

809

goto mandos_end;

714

810

}

731

827

}

732

828

733

829

if(debug){

734

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

830

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

831

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

735

832

}

736

833

737

834

if(quit_now){

739

836

goto mandos_end;

740

837

}

741

838

839

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

742

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

841

744

842

if(quit_now){

756

854

757

855

if(ret != GNUTLS_E_SUCCESS){

758

856

if(debug){

759

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

857

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

858

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

760

859

gnutls_perror(ret);

761

860

}

762

861

errno = EPROTO;

766

865

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

767

866

768

867

if(debug){

769

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

770

ip);

868

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

869

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

771

870

}

772

871

773

872

while(true){

778

877

}

779

878

780

879

buffer_capacity = incbuffer(&buffer, buffer_length,

781

buffer_capacity);

880

buffer_capacity);

782

881

if(buffer_capacity == 0){

783

882

int e = errno;

784

perror("incbuffer");

883

perror_plus("incbuffer");

785

884

errno = e;

786

885

goto mandos_end;

787

886

}

811

910

}

812

911

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

813

912

if(ret < 0){

814

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

913

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

914

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

815

915

gnutls_perror(ret);

816

916

errno = EPROTO;

817

917

goto mandos_end;

818

918

}

819

919

break;

820

920

default:

821

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

921

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

922

"Unknown error while reading data from"

822

923

" encrypted session with Mandos server\n");

823

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

824

925

errno = EIO;

830

931

}

831

932

832

933

if(debug){

833

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

934

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

935

"Closing TLS session\n");

834

936

}

835

937

836

938

if(quit_now){

848

950

849

951

if(buffer_length > 0){

850

952

ssize_t decrypted_buffer_size;

851

decrypted_buffer_size = pgp_packet_decrypt(buffer,

852

buffer_length,

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

853

954

&decrypted_buffer);

854

955

if(decrypted_buffer_size >= 0){

855

956

866

967

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

867

968

int e = errno;

868

969

if(debug){

869

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

970

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

971

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

870

972

strerror(errno));

871

973

}

872

974

errno = e;

892

994

if(e == 0){

893

995

e = errno;

894

996

}

895

perror("close");

997

perror_plus("close");

896

998

}

897

999

gnutls_deinit(session);

1000

errno = e;

898

1001

if(quit_now){

899

e = EINTR;

1002

errno = EINTR;

900

1003

retval = -1;

901

1004

}

902

errno = e;

903

1005

}

904

1006

return retval;

905

1007

}

930

1032

switch(event){

931

1033

default:

932

1034

case AVAHI_RESOLVER_FAILURE:

933

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

1035

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

1036

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

934

1037

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

935

1038

avahi_strerror(avahi_server_errno(mc.server)));

936

1039

break;

940

1043

char ip[AVAHI_ADDRESS_STR_MAX];

941

1044

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

942

1045

if(debug){

943

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

1046

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

1047

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

944

1048

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

945

1049

ip, (intmax_t)interface, port);

946

1050

}

948

1052

avahi_proto_to_af(proto));

949

1053

if(ret == 0){

950

1054

avahi_simple_poll_quit(mc.simple_poll);

1055

} else {

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

951

1058

}

952

1059

}

953

1060

}

977

1084

default:

978

1085

case AVAHI_BROWSER_FAILURE:

979

1086

980

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

1087

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

1088

"(Avahi browser) %s\n",

981

1089

avahi_strerror(avahi_server_errno(mc.server)));

982

1090

avahi_simple_poll_quit(mc.simple_poll);

983

1091

return;

991

1099

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

992

1100

name, type, domain, protocol, 0,

993

1101

resolve_callback, NULL) == NULL)

994

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

1102

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

1103

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

995

1104

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

996

1105

break;

997

1106

1001

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1002

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1003

1112

if(debug){

1004

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

1113

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

1114

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

1005

1115

}

1006

1116

break;

1007

1117

}

1008

1118

}

1009

1119

1010

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

1120

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

1011

1121

static void handle_sigterm(int sig){

1012

1122

if(quit_now){

1013

1123

return;

1015

1125

quit_now = 1;

1016

1126

signal_received = sig;

1017

1127

int old_errno = errno;

1128

/* set main loop to exit */

1018

1129

if(mc.simple_poll != NULL){

1019

1130

avahi_simple_poll_quit(mc.simple_poll);

1020

1131

}

1021

1132

errno = old_errno;

1022

1133

}

1023

1134

1024

/*

1025

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

1026

* corresponds to an acceptable network device.

1027

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

1028

*/

1029

int good_interface(const struct dirent *if_entry){

1030

ssize_t ssret;

1031

char *flagname = NULL;

1032

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

1033

return 0;

1034

}

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

if(flags_fd == -1){

1043

perror("open");

1044

free(flagname);

1045

return 0;

1046

}

1047

free(flagname);

1048

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

1049

/* read line from flags_fd */

1050

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

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

1052

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

1053

if(flagstring == NULL){

1054

perror("malloc");

1055

close(flags_fd);

1056

return 0;

1057

}

1058

while(to_read > 0){

1059

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

1060

(size_t)to_read));

1061

if(ssret == -1){

1062

perror("read");

1063

free(flagstring);

1064

close(flags_fd);

1065

return 0;

1066

}

1067

to_read -= ssret;

1068

if(ssret == 0){

1069

break;

1070

}

1071

}

1072

close(flags_fd);

1073

intmax_t tmpmax;

1074

char *tmp;

1075

errno = 0;

1076

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

1077

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

1078

and not (isspace(*tmp)))

1079

or tmpmax != (ifreq_flags)tmpmax){

1135

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

1136

int ret;

1137

1138

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

1139

if(s < 0){

1140

perror_plus("socket");

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1080

1146

if(debug){

1081

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

1082

flagstring, if_entry->d_name);

1147

perror_plus("ioctl SIOCGIFFLAGS");

1083

1148

}

1084

free(flagstring);

1085

return 0;

1149

return false;

1086

1150

}

1087

free(flagstring);

1088

ifreq_flags flags = (ifreq_flags)tmpmax;

1151

return true;

1152

}

1153

1154

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

1155

1089

1156

/* Reject the loopback device */

1090

if(flags & IFF_LOOPBACK){

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1091

1158

if(debug){

1092

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

1093

if_entry->d_name);

1159

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

1160

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

1094

1161

}

1095

return 0;

1162

return false;

1096

1163

}

1097

1164

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

1098

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

1165

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

1099

1166

if(debug){

1100

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

1101

if_entry->d_name);

1167

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

1168

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

1102

1169

}

1103

return 1;

1170

return true;

1104

1171

}

1105

1172

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

1106

if(not (flags & IFF_BROADCAST)){

1173

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

1107

1174

if(debug){

1108

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

1109

if_entry->d_name);

1175

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

1176

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

1110

1177

}

1111

return 0;

1178

return false;

1112

1179

}

1113

1180

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

1114

if(flags & IFF_NOARP){

1181

if(ifr->ifr_flags & IFF_NOARP){

1115

1182

if(debug){

1116

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

1117

if_entry->d_name);

1183

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

1184

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

1118

1185

}

1119

return 0;

1186

return false;

1120

1187

}

1188

1121

1189

/* Accept this device */

1122

1190

if(debug){

1123

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

1124

if_entry->d_name);

1125

}

1126

return 1;

1191

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

1192

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

1193

}

1194

return true;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device.

1200

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

1201

*/

1202

int good_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

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

1245

if(debug){

1246

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

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

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

1255

if(debug){

1256

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

1257

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

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1265

}

1266

return 1;

1267

}

1268

1269

int notdotentries(const struct dirent *direntry){

1270

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

1271

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

1272

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

1273

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

1274

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

1275

return 0;

1276

}

1277

return 1;

1278

}

1279

1280

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

1281

int runnable_hook(const struct dirent *direntry){

1282

int ret;

1283

size_t sret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

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

1292

"abcdefghijklmnopqrstuvwxyz"

1293

"0123456789"

1294

"_-");

1295

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

1296

/* Contains non-allowed characters */

1297

if(debug){

1298

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

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1313

if(ret == -1){

1314

if(debug){

1315

perror_plus("Could not stat hook");

1316

}

1317

return 0;

1318

}

1319

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

1320

/* Not a regular file */

1321

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1325

}

1326

return 0;

1327

}

1328

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

1329

/* Not executable */

1330

if(debug){

1331

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

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1334

}

1335

return 0;

1336

}

1337

return 1;

1338

}

1339

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1341

int ret;

1342

struct timespec now;

1343

struct timespec waited_time;

1344

intmax_t block_time;

1345

1346

while(true){

1347

if(mc.current_server == NULL){

1348

if (debug){

1349

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

1350

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

1351

}

1352

ret = avahi_simple_poll_iterate(s, -1);

1353

} else {

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1358

}

1359

/* the current time */

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1361

if(ret == -1){

1362

perror_plus("clock_gettime");

1363

return -1;

1364

}

1365

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

1366

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

1367

waited_time.tv_sec = (now.tv_sec

1368

- mc.current_server->last_seen.tv_sec);

1369

waited_time.tv_nsec = (now.tv_nsec

1370

- mc.current_server->last_seen.tv_nsec);

1371

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

1372

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

1373

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

1374

block_time = ((retry_interval

1375

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

1376

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

1377

1378

if (debug){

1379

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

1380

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

1381

}

1382

1383

if(block_time <= 0){

1384

ret = start_mandos_communication(mc.current_server->ip,

1385

mc.current_server->port,

1386

mc.current_server->if_index,

1387

mc.current_server->af);

1388

if(ret == 0){

1389

avahi_simple_poll_quit(mc.simple_poll);

1390

return 0;

1391

}

1392

ret = clock_gettime(CLOCK_MONOTONIC,

1393

&mc.current_server->last_seen);

1394

if(ret == -1){

1395

perror_plus("clock_gettime");

1396

return -1;

1397

}

1398

mc.current_server = mc.current_server->next;

1399

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

1400

servers, but don't block */

1401

}

1402

1403

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

1404

}

1405

if(ret != 0){

1406

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

1407

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

1408

}

1409

}

1410

}

1127

1411

}

1128

1412

1129

1413

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

1148

1432

bool gnutls_initialized = false;

1149

1433

bool gpgme_initialized = false;

1150

1434

float delay = 2.5f;

1435

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

1436

retrying the same server again */

1151

1437

1152

1438

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1153

1439

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1159

1445

errno = 0;

1160

1446

ret = setgid(gid);

1161

1447

if(ret == -1){

1162

perror("setgid");

1448

perror_plus("setgid");

1163

1449

}

1164

1450

1165

1451

/* Lower user privileges (temporarily) */

1166

1452

errno = 0;

1167

1453

ret = seteuid(uid);

1168

1454

if(ret == -1){

1169

perror("seteuid");

1455

perror_plus("seteuid");

1170

1456

}

1171

1457

1172

1458

if(quit_now){

1207

1493

.arg = "SECONDS",

1208

1494

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

1209

1495

.group = 2 },

1496

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

1497

.arg = "SECONDS",

1498

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

1499

.group = 2 },

1500

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

1501

.arg = "DIR",

1502

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

1503

.group = 2 },

1210

1504

/*

1211

1505

* These reproduce what we would get without ARGP_NO_HELP

1212

1506

*/

1256

1550

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

1257

1551

argp_error(state, "Bad delay");

1258

1552

}

1553

case 132: /* --retry */

1554

errno = 0;

1555

retry_interval = strtod(arg, &tmp);

1556

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

1557

or (retry_interval * 1000) > INT_MAX

1558

or retry_interval < 0){

1559

argp_error(state, "Bad retry interval");

1560

}

1561

break;

1562

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

1563

hookdir = arg;

1259

1564

break;

1260

1565

/*

1261

1566

* These reproduce what we would get without ARGP_NO_HELP

1268

1573

argp_state_help(state, state->out_stream,

1269

1574

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1270

1575

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

1576

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

1271

1577

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

1272

1578

exit(argp_err_exit_status);

1273

1579

break;

1289

1595

case ENOMEM:

1290

1596

default:

1291

1597

errno = ret;

1292

perror("argp_parse");

1598

perror_plus("argp_parse");

1293

1599

exitcode = EX_OSERR;

1294

1600

goto end;

1295

1601

case EINVAL:

1297

1603

goto end;

1298

1604

}

1299

1605

}

1606

1607

{

1608

/* Work around Debian bug #633582:

1609

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

1610

struct stat st;

1611

1612

/* Re-raise priviliges */

1613

errno = 0;

1614

ret = seteuid(0);

1615

if(ret == -1){

1616

perror_plus("seteuid");

1617

}

1618

1619

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

1620

int seckey_fd = open(seckey, O_RDONLY);

1621

if(seckey_fd == -1){

1622

perror_plus("open");

1623

} else {

1624

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

1625

if(ret == -1){

1626

perror_plus("fstat");

1627

} else {

1628

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

1629

ret = fchown(seckey_fd, uid, gid);

1630

if(ret == -1){

1631

perror_plus("fchown");

1632

}

1633

}

1634

}

1635

TEMP_FAILURE_RETRY(close(seckey_fd));

1636

}

1637

}

1638

1639

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

1640

int pubkey_fd = open(pubkey, O_RDONLY);

1641

if(pubkey_fd == -1){

1642

perror_plus("open");

1643

} else {

1644

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

1645

if(ret == -1){

1646

perror_plus("fstat");

1647

} else {

1648

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

1649

ret = fchown(pubkey_fd, uid, gid);

1650

if(ret == -1){

1651

perror_plus("fchown");

1652

}

1653

}

1654

}

1655

TEMP_FAILURE_RETRY(close(pubkey_fd));

1656

}

1657

}

1658

1659

/* Lower privileges */

1660

errno = 0;

1661

ret = seteuid(uid);

1662

if(ret == -1){

1663

perror_plus("seteuid");

1664

}

1665

}

1666

1667

/* Find network hooks and run them */

1668

{

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

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

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

1675

} else {

1676

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

1677

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

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

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

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

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

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

perror_plus("setenv");

1709

exit(1);

1710

}

1711

char *delaystring;

1712

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

1713

if(ret == -1){

1714

perror_plus("asprintf");

1715

exit(1);

1716

}

1717

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

1718

if(ret == -1){

1719

free(delaystring);

1720

perror_plus("setenv");

1721

exit(1);

1722

}

1723

free(delaystring);

1724

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

1725

perror_plus("execl");

1726

} else {

1727

int status;

1728

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

1729

perror_plus("waitpid");

1730

free(fullname);

1731

continue;

1732

}

1733

if(WIFEXITED(status)){

1734

if(WEXITSTATUS(status) != 0){

1735

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

1736

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

1737

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

1738

WEXITSTATUS(status));

1739

free(fullname);

1740

continue;

1741

}

1742

} else if(WIFSIGNALED(status)){

1743

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

1744

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

1745

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

1746

WTERMSIG(status));

1747

free(fullname);

1748

continue;

1749

} else {

1750

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

1751

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

1752

direntry->d_name);

1753

free(fullname);

1754

continue;

1755

}

1756

}

1757

free(fullname);

1758

if(quit_now){

1759

goto end;

1760

}

1761

}

1762

close(devnull);

1763

}

1764

}

1300

1765

1301

1766

if(not debug){

1302

1767

avahi_set_log_function(empty_log);

1303

1768

}

1304

1769

1305

1770

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

1306

1771

struct dirent **direntries;

1307

ret = scandir(sys_class_net, &direntries, good_interface,

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1308

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1309

1781

if(ret >= 1){

1310

/* Pick the first good interface */

1782

/* Pick the first interface returned */

1311

1783

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

1312

1784

if(debug){

1313

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

1785

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

1786

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

1314

1787

}

1315

1788

if(interface == NULL){

1316

perror("malloc");

1789

perror_plus("malloc");

1317

1790

free(direntries);

1318

1791

exitcode = EXIT_FAILURE;

1319

1792

goto end;

1321

1794

free(direntries);

1322

1795

} else {

1323

1796

free(direntries);

1324

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

1797

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

1798

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

1325

1799

exitcode = EXIT_FAILURE;

1326

1800

goto end;

1327

1801

}

1333

1807

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

1334

1808

mc.simple_poll = avahi_simple_poll_new();

1335

1809

if(mc.simple_poll == NULL){

1336

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

1810

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

1811

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

1337

1812

exitcode = EX_UNAVAILABLE;

1338

1813

goto end;

1339

1814

}

1341

1816

sigemptyset(&sigterm_action.sa_mask);

1342

1817

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

1343

1818

if(ret == -1){

1344

perror("sigaddset");

1819

perror_plus("sigaddset");

1345

1820

exitcode = EX_OSERR;

1346

1821

goto end;

1347

1822

}

1348

1823

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

1349

1824

if(ret == -1){

1350

perror("sigaddset");

1825

perror_plus("sigaddset");

1351

1826

exitcode = EX_OSERR;

1352

1827

goto end;

1353

1828

}

1354

1829

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

1355

1830

if(ret == -1){

1356

perror("sigaddset");

1831

perror_plus("sigaddset");

1357

1832

exitcode = EX_OSERR;

1358

1833

goto end;

1359

1834

}

1363

1838

*/

1364

1839

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

1365

1840

if(ret == -1){

1366

perror("sigaction");

1841

perror_plus("sigaction");

1367

1842

return EX_OSERR;

1368

1843

}

1369

1844

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

1845

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

1371

1846

if(ret == -1){

1372

perror("sigaction");

1847

perror_plus("sigaction");

1373

1848

exitcode = EX_OSERR;

1374

1849

goto end;

1375

1850

}

1376

1851

}

1377

1852

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

1378

1853

if(ret == -1){

1379

perror("sigaction");

1854

perror_plus("sigaction");

1380

1855

return EX_OSERR;

1381

1856

}

1382

1857

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

1858

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

1384

1859

if(ret == -1){

1385

perror("sigaction");

1860

perror_plus("sigaction");

1386

1861

exitcode = EX_OSERR;

1387

1862

goto end;

1388

1863

}

1389

1864

}

1390

1865

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

1391

1866

if(ret == -1){

1392

perror("sigaction");

1867

perror_plus("sigaction");

1393

1868

return EX_OSERR;

1394

1869

}

1395

1870

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

1871

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

1397

1872

if(ret == -1){

1398

perror("sigaction");

1873

perror_plus("sigaction");

1399

1874

exitcode = EX_OSERR;

1400

1875

goto end;

1401

1876

}

1405

1880

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

1406

1881

if_index = (AvahiIfIndex) if_nametoindex(interface);

1407

1882

if(if_index == 0){

1408

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

1883

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

1884

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

1409

1885

exitcode = EX_UNAVAILABLE;

1410

1886

goto end;

1411

1887

}

1418

1894

errno = 0;

1419

1895

ret = seteuid(0);

1420

1896

if(ret == -1){

1421

perror("seteuid");

1897

perror_plus("seteuid");

1422

1898

}

1423

1899

1424

1900

#ifdef __linux__

1428

1904

bool restore_loglevel = true;

1429

1905

if(ret == -1){

1430

1906

restore_loglevel = false;

1431

perror("klogctl");

1907

perror_plus("klogctl");

1432

1908

}

1433

1909

#endif /* __linux__ */

1434

1910

1435

1911

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1912

if(sd < 0){

1437

perror("socket");

1913

perror_plus("socket");

1438

1914

exitcode = EX_OSERR;

1439

1915

#ifdef __linux__

1440

1916

if(restore_loglevel){

1441

1917

ret = klogctl(7, NULL, 0);

1442

1918

if(ret == -1){

1443

perror("klogctl");

1919

perror_plus("klogctl");

1444

1920

}

1445

1921

}

1446

1922

#endif /* __linux__ */

1448

1924

errno = 0;

1449

1925

ret = seteuid(uid);

1450

1926

if(ret == -1){

1451

perror("seteuid");

1927

perror_plus("seteuid");

1452

1928

}

1453

1929

goto end;

1454

1930

}

1455

1931

strcpy(network.ifr_name, interface);

1456

1932

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

1457

1933

if(ret == -1){

1458

perror("ioctl SIOCGIFFLAGS");

1934

perror_plus("ioctl SIOCGIFFLAGS");

1459

1935

#ifdef __linux__

1460

1936

if(restore_loglevel){

1461

1937

ret = klogctl(7, NULL, 0);

1462

1938

if(ret == -1){

1463

perror("klogctl");

1939

perror_plus("klogctl");

1464

1940

}

1465

1941

}

1466

1942

#endif /* __linux__ */

1469

1945

errno = 0;

1470

1946

ret = seteuid(uid);

1471

1947

if(ret == -1){

1472

perror("seteuid");

1948

perror_plus("seteuid");

1473

1949

}

1474

1950

goto end;

1475

1951

}

1479

1955

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

1480

1956

if(ret == -1){

1481

1957

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1958

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1483

1959

exitcode = EX_OSERR;

1484

1960

#ifdef __linux__

1485

1961

if(restore_loglevel){

1486

1962

ret = klogctl(7, NULL, 0);

1487

1963

if(ret == -1){

1488

perror("klogctl");

1964

perror_plus("klogctl");

1489

1965

}

1490

1966

}

1491

1967

#endif /* __linux__ */

1493

1969

errno = 0;

1494

1970

ret = seteuid(uid);

1495

1971

if(ret == -1){

1496

perror("seteuid");

1972

perror_plus("seteuid");

1497

1973

}

1498

1974

goto end;

1499

1975

}

1500

1976

}

1501

/* sleep checking until interface is running */

1977

/* Sleep checking until interface is running.

1978

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

1502

1979

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

1503

1980

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

1504

1981

if(ret == -1){

1505

perror("ioctl SIOCGIFFLAGS");

1982

perror_plus("ioctl SIOCGIFFLAGS");

1506

1983

} else if(network.ifr_flags & IFF_RUNNING){

1507

1984

break;

1508

1985

}

1509

1986

struct timespec sleeptime = { .tv_nsec = 250000000 };

1510

1987

ret = nanosleep(&sleeptime, NULL);

1511

1988

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

1512

perror("nanosleep");

1989

perror_plus("nanosleep");

1513

1990

}

1514

1991

}

1515

1992

if(not take_down_interface){

1516

1993

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

1517

1994

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

1518

1995

if(ret == -1){

1519

perror("close");

1996

perror_plus("close");

1520

1997

}

1521

1998

}

1522

1999

#ifdef __linux__

1524

2001

/* Restores kernel loglevel to default */

1525

2002

ret = klogctl(7, NULL, 0);

1526

2003

if(ret == -1){

1527

perror("klogctl");

2004

perror_plus("klogctl");

1528

2005

}

1529

2006

}

1530

2007

#endif /* __linux__ */

1534

2011

/* Lower privileges */

1535

2012

ret = seteuid(uid);

1536

2013

if(ret == -1){

1537

perror("seteuid");

2014

perror_plus("seteuid");

1538

2015

}

1539

2016

} else {

1540

2017

/* Lower privileges permanently */

1541

2018

ret = setuid(uid);

1542

2019

if(ret == -1){

1543

perror("setuid");

2020

perror_plus("setuid");

1544

2021

}

1545

2022

}

1546

2023

}

1551

2028

1552

2029

ret = init_gnutls_global(pubkey, seckey);

1553

2030

if(ret == -1){

1554

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

2031

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

2032

"init_gnutls_global failed\n");

1555

2033

exitcode = EX_UNAVAILABLE;

1556

2034

goto end;

1557

2035

} else {

1562

2040

goto end;

1563

2041

}

1564

2042

2043

if(mkdtemp(tempdir) == NULL){

2044

perror_plus("mkdtemp");

2045

goto end;

2046

}

1565

2047

tempdir_created = true;

1566

if(mkdtemp(tempdir) == NULL){

1567

tempdir_created = false;

1568

perror("mkdtemp");

1569

goto end;

1570

}

1571

2048

1572

2049

if(quit_now){

1573

2050

goto end;

1574

2051

}

1575

2052

1576

2053

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

1577

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

2054

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

2055

"init_gpgme failed\n");

1578

2056

exitcode = EX_UNAVAILABLE;

1579

2057

goto end;

1580

2058

} else {

1590

2068

/* (Mainly meant for debugging) */

1591

2069

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

1592

2070

if(address == NULL){

1593

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

2071

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

2072

"No colon in address\n");

1594

2073

exitcode = EX_USAGE;

1595

2074

goto end;

1596

2075

}

1604

2083

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

1605

2084

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

1606

2085

or tmpmax != (uint16_t)tmpmax){

1607

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

2086

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

2087

"Bad port number\n");

1608

2088

exitcode = EX_USAGE;

1609

2089

goto end;

1610

2090

}

1615

2095

1616

2096

port = (uint16_t)tmpmax;

1617

2097

*address = '\0';

1618

address = connect_to;

1619

2098

/* Colon in address indicates IPv6 */

1620

2099

int af;

1621

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

2100

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

1622

2101

af = AF_INET6;

2102

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

2103

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

2104

{

2105

connect_to++;

2106

address[-1] = '\0';

2107

}

1623

2108

} else {

1624

2109

af = AF_INET;

1625

2110

}

2111

address = connect_to;

1626

2112

1627

2113

if(quit_now){

1628

2114

goto end;

1629

2115

}

1630

2116

1631

2117

while(not quit_now){

1632

2118

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

1633

2119

if(quit_now or ret == 0){

1634

2120

break;

1635

2121

}

1636

sleep(15);

1637

};

1638

2122

if(debug){

2123

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

2124

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

2125

}

2126

sleep((int)retry_interval);

2127

}

2128

1639

2129

if (not quit_now){

1640

2130

exitcode = EXIT_SUCCESS;

1641

2131

}

1642

2132

1643

2133

goto end;

1644

2134

}

1645

2135

1667

2157

1668

2158

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

1669

2159

if(mc.server == NULL){

1670

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

2160

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

2161

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

1671

2162

avahi_strerror(error));

1672

2163

exitcode = EX_UNAVAILABLE;

1673

2164

goto end;

1682

2173

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1683

2174

NULL, 0, browse_callback, NULL);

1684

2175

if(sb == NULL){

1685

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

2176

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

2177

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

1686

2178

avahi_strerror(avahi_server_errno(mc.server)));

1687

2179

exitcode = EX_UNAVAILABLE;

1688

2180

goto end;

1695

2187

/* Run the main loop */

1696

2188

1697

2189

if(debug){

1698

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

1699

}

1700

1701

avahi_simple_poll_loop(mc.simple_poll);

2190

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

2191

"Starting Avahi loop search\n");

2192

}

2193

2194

ret = avahi_loop_with_timeout(mc.simple_poll,

2195

(int)(retry_interval * 1000));

2196

if(debug){

2197

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

2198

"avahi_loop_with_timeout exited %s\n",

2199

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

2200

}

1702

2201

1703

2202

end:

1704

2203

1705

2204

if(debug){

1706

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

2205

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

2206

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

1707

2207

}

1708

2208

1709

2209

/* Cleanup things */

1725

2225

if(gpgme_initialized){

1726

2226

gpgme_release(mc.ctx);

1727

2227

}

2228

2229

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

2230

has seen */

2231

if(mc.current_server != NULL){

2232

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

2233

while(mc.current_server != NULL){

2234

server *next = mc.current_server->next;

2235

free(mc.current_server);

2236

mc.current_server = next;

2237

}

2238

}

2239

2240

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

1728

2241

1729

2242

/* Take down the network interface */

1730

2243

if(take_down_interface){

1732

2245

errno = 0;

1733

2246

ret = seteuid(0);

1734

2247

if(ret == -1){

1735

perror("seteuid");

2248

perror_plus("seteuid");

1736

2249

}

1737

2250

if(geteuid() == 0){

1738

2251

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

1739

2252

if(ret == -1){

1740

perror("ioctl SIOCGIFFLAGS");

1741

} else if(network.ifr_flags & IFF_UP) {

2253

perror_plus("ioctl SIOCGIFFLAGS");

2254

} else if(network.ifr_flags & IFF_UP){

1742

2255

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

1743

2256

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

1744

2257

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2258

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1746

2259

}

1747

2260

}

1748

2261

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

1749

2262

if(ret == -1){

1750

perror("close");

2263

perror_plus("close");

1751

2264

}

1752

2265

/* Lower privileges permanently */

1753

2266

errno = 0;

1754

2267

ret = setuid(uid);

1755

2268

if(ret == -1){

1756

perror("setuid");

2269

perror_plus("setuid");

1757

2270

}

1758

2271

}

1759

2272

}

1760

2273

1761

/* Removes the temp directory used by GPGME */

2274

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

1762

2275

if(tempdir_created){

1763

DIR *d;

1764

struct dirent *direntry;

1765

d = opendir(tempdir);

1766

if(d == NULL){

1767

if(errno != ENOENT){

1768

perror("opendir");

1769

}

1770

} else {

1771

while(true){

1772

direntry = readdir(d);

1773

if(direntry == NULL){

1774

break;

1775

}

1776

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

1777

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

1778

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

1779

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

1780

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

1781

continue;

1782

}

2276

struct dirent **direntries = NULL;

2277

struct dirent *direntry = NULL;

2278

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

2279

alphasort);

2280

if (numentries > 0){

2281

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

2282

direntry = direntries[i];

1783

2283

char *fullname = NULL;

1784

2284

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

1785

2285

direntry->d_name);

1786

2286

if(ret < 0){

1787

perror("asprintf");

2287

perror_plus("asprintf");

1788

2288

continue;

1789

2289

}

1790

2290

ret = remove(fullname);

1791

2291

if(ret == -1){

1792

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

1793

strerror(errno));

2292

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

2293

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

1794

2294

}

1795

2295

free(fullname);

1796

2296

}

1797

closedir(d);

2297

}

2298

2299

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

2300

free(direntries);

2301

if (numentries == -1){

2302

perror_plus("scandir");

1798

2303

}

1799

2304

ret = rmdir(tempdir);

1800

2305

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

1801

perror("rmdir");

2306

perror_plus("rmdir");

1802

2307

}

1803

2308

}

1804

2309

1809

2314

&old_sigterm_action,

1810

2315

NULL));

1811

2316

if(ret == -1){

1812

perror("sigaction");

2317

perror_plus("sigaction");

1813

2318

}

1814

2319

do {

1815

2320

ret = raise(signal_received);

1816

2321

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

1817

2322

if(ret != 0){

1818

perror("raise");

2323

perror_plus("raise");

1819

2324

abort();

1820

2325

}

1821

2326

TEMP_FAILURE_RETRY(pause());