/mandos/release : revision 237.16.3

9

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

10

*

11

* Everything else is

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13

12

13

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*

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

16

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

26

* along with this program. If not, see

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

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*

29

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

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

30

*/

31

32

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

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

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srand(), strtof() */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

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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,

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inet_pton(), connect() */

59

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

62

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

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strtoimax() */

64

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

65

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

66

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

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

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program_invocation_short_name */

67

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

67

68

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

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69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

getuid(), getgid(), setuid(),

75

setgid() */

76

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

75

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

76

setgid(), pause() */

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,

80

81

argp_parse(), ARGP_KEY_ARG,

81

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

83

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

84

sigaction(), SIGTERM, sig_atomic_t,

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

85

90

86

91

#ifdef __linux__

87

92

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

120

125

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

121

126

#define SECKEY "seckey.txt"

122

127

#define PUBKEY "pubkey.txt"

128

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

123

129

124

130

bool debug = false;

125

131

static const char mandos_protocol_version[] = "1";

126

132

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

127

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

133

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

134

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

135

char *connect_to = NULL;

136

137

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

138

typedef struct server{

139

const char *ip;

140

uint16_t port;

141

AvahiIfIndex if_index;

142

int af;

143

struct timespec last_seen;

144

struct server *next;

145

struct server *prev;

146

} server;

128

147

129

148

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

130

149

typedef struct {

135

154

gnutls_dh_params_t dh_params;

136

155

const char *priority;

137

156

gpgme_ctx_t ctx;

157

server *current_server;

138

158

} mandos_context;

139

159

140

160

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

141

161

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

142

162

.dh_bits = 1024, .priority = "SECURE256"

143

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

163

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

164

.current_server = NULL };

165

166

sig_atomic_t quit_now = 0;

167

int signal_received = 0;

168

169

/* Function to use when printing errors */

170

void perror_plus(const char *print_text){

171

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

172

program_invocation_short_name);

173

perror(print_text);

174

}

144

175

145

176

/*

146

177

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

159

190

return buffer_capacity;

160

191

}

161

192

193

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

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

197

int ret;

198

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

199

if(new_server == NULL){

200

perror_plus("malloc");

201

return -1;

202

}

203

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

207

if(new_server->ip == NULL){

208

perror_plus("strdup");

209

return -1;

210

}

211

/* Special case of first server */

212

if (mc.current_server == NULL){

213

new_server->next = new_server;

214

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

217

} else {

218

new_server->next = mc.current_server;

219

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

220

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

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

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

229

}

230

162

231

/*

163

232

* Initialize GPGME.

164

233

*/

165

234

static bool init_gpgme(const char *seckey,

166

235

const char *pubkey, const char *tempdir){

167

int ret;

168

236

gpgme_error_t rc;

169

237

gpgme_engine_info_t engine_info;

170

238

173

241

* Helper function to insert pub and seckey to the engine keyring.

174

242

*/

175

243

bool import_key(const char *filename){

244

int ret;

176

245

int fd;

177

246

gpgme_data_t pgp_data;

178

247

179

248

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

180

249

if(fd == -1){

181

perror("open");

250

perror_plus("open");

182

251

return false;

183

252

}

184

253

185

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

255

if(rc != GPG_ERR_NO_ERROR){

187

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",

188

258

gpgme_strsource(rc), gpgme_strerror(rc));

189

259

return false;

190

260

}

191

261

192

262

rc = gpgme_op_import(mc.ctx, pgp_data);

193

263

if(rc != GPG_ERR_NO_ERROR){

194

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

264

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

265

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

195

266

gpgme_strsource(rc), gpgme_strerror(rc));

196

267

return false;

197

268

}

198

269

199

270

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

200

271

if(ret == -1){

201

perror("close");

272

perror_plus("close");

202

273

}

203

274

gpgme_data_release(pgp_data);

204

275

return true;

205

276

}

206

277

207

278

if(debug){

208

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

279

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

280

"Initializing GPGME\n");

209

281

}

210

282

211

283

/* Init GPGME */

212

284

gpgme_check_version(NULL);

213

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

286

if(rc != GPG_ERR_NO_ERROR){

215

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",

216

289

gpgme_strsource(rc), gpgme_strerror(rc));

217

290

return false;

218

291

}

219

292

220

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

293

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

221

294

rc = gpgme_get_engine_info(&engine_info);

222

295

if(rc != GPG_ERR_NO_ERROR){

223

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",

224

298

gpgme_strsource(rc), gpgme_strerror(rc));

225

299

return false;

226

300

}

233

307

engine_info = engine_info->next;

234

308

}

235

309

if(engine_info == NULL){

236

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);

237

312

return false;

238

313

}

239

314

240

315

/* Create new GPGME "context" */

241

316

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

242

317

if(rc != GPG_ERR_NO_ERROR){

243

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

244

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));

245

321

return false;

246

322

}

247

323

249

325

return false;

250

326

}

251

327

252

return true;

328

return true;

253

329

}

254

330

255

331

/*

266

342

ssize_t plaintext_length = 0;

267

343

268

344

if(debug){

269

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

345

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

346

"Trying to decrypt OpenPGP data\n");

270

347

}

271

348

272

349

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

273

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

351

0);

275

352

if(rc != GPG_ERR_NO_ERROR){

276

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",

277

355

gpgme_strsource(rc), gpgme_strerror(rc));

278

356

return -1;

279

357

}

281

359

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

282

360

rc = gpgme_data_new(&dh_plain);

283

361

if(rc != GPG_ERR_NO_ERROR){

284

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

362

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

363

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

285

364

gpgme_strsource(rc), gpgme_strerror(rc));

286

365

gpgme_data_release(dh_crypto);

287

366

return -1;

291

370

data buffer */

292

371

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

293

372

if(rc != GPG_ERR_NO_ERROR){

294

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

373

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

374

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

295

375

gpgme_strsource(rc), gpgme_strerror(rc));

296

376

plaintext_length = -1;

297

377

if(debug){

298

378

gpgme_decrypt_result_t result;

299

379

result = gpgme_op_decrypt_result(mc.ctx);

300

380

if(result == NULL){

301

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

381

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

382

"gpgme_op_decrypt_result failed\n");

302

383

} else {

303

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

384

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

385

"Unsupported algorithm: %s\n",

304

386

result->unsupported_algorithm);

305

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

387

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

388

"Wrong key usage: %u\n",

306

389

result->wrong_key_usage);

307

390

if(result->file_name != NULL){

308

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

391

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

392

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

309

393

}

310

394

gpgme_recipient_t recipient;

311

395

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

396

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

406

recipient = recipient->next;

322

407

}

323

408

}

324

409

}

326

411

}

327

412

328

413

if(debug){

329

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

330

416

}

331

417

332

418

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

333

419

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

334

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

335

421

plaintext_length = -1;

336

422

goto decrypt_end;

337

423

}

342

428

(size_t)plaintext_length,

343

429

plaintext_capacity);

344

430

if(plaintext_capacity == 0){

345

perror("incbuffer");

431

perror_plus("incbuffer");

346

432

plaintext_length = -1;

347

433

goto decrypt_end;

348

434

}

355

441

break;

356

442

}

357

443

if(ret < 0){

358

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

359

445

plaintext_length = -1;

360

446

goto decrypt_end;

361

447

}

363

449

}

364

450

365

451

if(debug){

366

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

452

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

453

"Decrypted password is: ");

367

454

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

368

455

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

369

456

}

391

478

/* GnuTLS log function callback */

392

479

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

393

480

const char* string){

394

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

481

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

395

482

}

396

483

397

484

static int init_gnutls_global(const char *pubkeyfilename,

399

486

int ret;

400

487

401

488

if(debug){

402

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

489

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

490

"Initializing GnuTLS\n");

403

491

}

404

492

405

493

ret = gnutls_global_init();

406

494

if(ret != GNUTLS_E_SUCCESS){

407

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

408

safer_gnutls_strerror(ret));

495

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

496

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

409

497

return -1;

410

498

}

411

499

418

506

}

419

507

420

508

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

510

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

427

safer_gnutls_strerror(ret));

511

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

512

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

428

513

gnutls_global_deinit();

429

514

return -1;

430

515

}

431

516

432

517

if(debug){

433

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"

434

520

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

435

521

seckeyfilename);

436

522

}

440

526

GNUTLS_OPENPGP_FMT_BASE64);

441

527

if(ret != GNUTLS_E_SUCCESS){

442

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

443

530

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

444

531

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

445

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

446

safer_gnutls_strerror(ret));

532

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

533

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

447

534

goto globalfail;

448

535

}

449

536

450

537

/* GnuTLS server initialization */

451

538

ret = gnutls_dh_params_init(&mc.dh_params);

452

539

if(ret != GNUTLS_E_SUCCESS){

453

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

540

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

541

"Error in GnuTLS DH parameter initialization:"

454

542

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

455

543

goto globalfail;

456

544

}

457

545

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

458

546

if(ret != GNUTLS_E_SUCCESS){

459

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

547

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

548

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

460

549

safer_gnutls_strerror(ret));

461

550

goto globalfail;

462

551

}

476

565

static int init_gnutls_session(gnutls_session_t *session){

477

566

int ret;

478

567

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

568

do {

569

ret = gnutls_init(session, GNUTLS_SERVER);

570

if(quit_now){

571

return -1;

572

}

573

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

480

574

if(ret != GNUTLS_E_SUCCESS){

481

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

575

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

576

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

482

577

safer_gnutls_strerror(ret));

483

578

}

484

579

485

580

{

486

581

const char *err;

487

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

582

do {

583

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

584

if(quit_now){

585

gnutls_deinit(*session);

586

return -1;

587

}

588

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

488

589

if(ret != GNUTLS_E_SUCCESS){

489

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

490

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

491

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));

492

594

gnutls_deinit(*session);

493

595

return -1;

494

596

}

495

597

}

496

598

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

599

do {

600

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

601

mc.cred);

602

if(quit_now){

603

gnutls_deinit(*session);

604

return -1;

605

}

606

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

499

607

if(ret != GNUTLS_E_SUCCESS){

500

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

608

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

609

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

501

610

safer_gnutls_strerror(ret));

502

611

gnutls_deinit(*session);

503

612

return -1;

504

613

}

505

614

506

615

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

616

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

617

510

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

619

520

628

static int start_mandos_communication(const char *ip, uint16_t port,

521

629

AvahiIfIndex if_index,

522

630

int af){

523

int ret, tcp_sd;

631

int ret, tcp_sd = -1;

524

632

ssize_t sret;

525

633

union {

526

634

struct sockaddr_in in;

527

635

struct sockaddr_in6 in6;

528

636

} to;

529

637

char *buffer = NULL;

530

char *decrypted_buffer;

638

char *decrypted_buffer = NULL;

531

639

size_t buffer_length = 0;

532

640

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

641

size_t written;

535

int retval = 0;

642

int retval = -1;

536

643

gnutls_session_t session;

537

644

int pf; /* Protocol family */

538

645

646

errno = 0;

647

648

if(quit_now){

649

errno = EINTR;

650

return -1;

651

}

652

539

653

switch(af){

540

654

case AF_INET6:

541

655

pf = PF_INET6;

544

658

pf = PF_INET;

545

659

break;

546

660

default:

547

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

661

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

662

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

663

errno = EINVAL;

548

664

return -1;

549

665

}

550

666

554

670

}

555

671

556

672

if(debug){

557

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

558

675

"\n", ip, port);

559

676

}

560

677

561

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

679

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

680

int e = errno;

681

perror_plus("socket");

682

errno = e;

683

goto mandos_end;

684

}

685

686

if(quit_now){

687

errno = EINTR;

688

goto mandos_end;

565

689

}

566

690

567

691

memset(&to, 0, sizeof(to));

573

697

ret = inet_pton(af, ip, &to.in.sin_addr);

574

698

}

575

699

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

700

int e = errno;

701

perror_plus("inet_pton");

702

errno = e;

703

goto mandos_end;

578

704

}

579

705

if(ret == 0){

580

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

581

return -1;

706

int e = errno;

707

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

708

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

709

errno = e;

710

goto mandos_end;

582

711

}

583

712

if(af == AF_INET6){

584

713

to.in6.sin6_port = htons(port); /* Spurious warnings from

589

718

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

590

719

-Wunreachable-code*/

591

720

if(if_index == AVAHI_IF_UNSPEC){

592

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

721

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

722

"An IPv6 link-local address is incomplete"

593

723

" without a network interface\n");

594

return -1;

724

errno = EINVAL;

725

goto mandos_end;

595

726

}

596

727

/* Set the network interface number as scope */

597

728

to.in6.sin6_scope_id = (uint32_t)if_index;

602

733

-Wunreachable-code */

603

734

}

604

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

605

741

if(debug){

606

742

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

607

743

char interface[IF_NAMESIZE];

608

744

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

609

perror("if_indextoname");

745

perror_plus("if_indextoname");

610

746

} else {

611

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

747

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

748

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

612

749

ip, interface, port);

613

750

}

614

751

} else {

615

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

616

port);

752

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

753

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

617

754

}

618

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

626

763

sizeof(addrstr));

627

764

}

628

765

if(pcret == NULL){

629

perror("inet_ntop");

766

perror_plus("inet_ntop");

630

767

} else {

631

768

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

632

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

769

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

770

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

633

771

}

634

772

}

635

773

}

636

774

775

if(quit_now){

776

errno = EINTR;

777

goto mandos_end;

778

}

779

637

780

if(af == AF_INET6){

638

781

ret = connect(tcp_sd, &to.in6, sizeof(to));

639

782

} else {

640

783

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

641

784

}

642

785

if(ret < 0){

643

perror("connect");

644

return -1;

786

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

787

int e = errno;

788

perror_plus("connect");

789

errno = e;

790

}

791

goto mandos_end;

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

645

797

}

646

798

647

799

const char *out = mandos_protocol_version;

651

803

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

652

804

out_size - written));

653

805

if(ret == -1){

654

perror("write");

655

retval = -1;

806

int e = errno;

807

perror_plus("write");

808

errno = e;

656

809

goto mandos_end;

657

810

}

658

811

written += (size_t)ret;

666

819

break;

667

820

}

668

821

}

822

823

if(quit_now){

824

errno = EINTR;

825

goto mandos_end;

826

}

669

827

}

670

828

671

829

if(debug){

672

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

673

}

674

830

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

831

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

832

}

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

839

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

675

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

841

677

do{

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

847

do {

678

848

ret = gnutls_handshake(session);

849

if(quit_now){

850

errno = EINTR;

851

goto mandos_end;

852

}

679

853

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

680

854

681

855

if(ret != GNUTLS_E_SUCCESS){

682

856

if(debug){

683

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

857

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

858

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

684

859

gnutls_perror(ret);

685

860

}

686

retval = -1;

861

errno = EPROTO;

687

862

goto mandos_end;

688

863

}

689

864

690

865

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

691

866

692

867

if(debug){

693

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

694

ip);

868

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

869

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

695

870

}

696

871

697

872

while(true){

873

874

if(quit_now){

875

errno = EINTR;

876

goto mandos_end;

877

}

878

698

879

buffer_capacity = incbuffer(&buffer, buffer_length,

699

880

buffer_capacity);

700

881

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

882

int e = errno;

883

perror_plus("incbuffer");

884

errno = e;

885

goto mandos_end;

886

}

887

888

if(quit_now){

889

errno = EINTR;

703

890

goto mandos_end;

704

891

}

705

892

714

901

case GNUTLS_E_AGAIN:

715

902

break;

716

903

case GNUTLS_E_REHANDSHAKE:

717

do{

904

do {

718

905

ret = gnutls_handshake(session);

906

907

if(quit_now){

908

errno = EINTR;

909

goto mandos_end;

910

}

719

911

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

720

912

if(ret < 0){

721

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

913

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

914

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

722

915

gnutls_perror(ret);

723

retval = -1;

916

errno = EPROTO;

724

917

goto mandos_end;

725

918

}

726

919

break;

727

920

default:

728

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

921

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

922

"Unknown error while reading data from"

729

923

" encrypted session with Mandos server\n");

730

retval = -1;

731

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

errno = EIO;

732

926

goto mandos_end;

733

927

}

734

928

} else {

737

931

}

738

932

739

933

if(debug){

740

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

741

}

742

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

934

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

935

"Closing TLS session\n");

936

}

937

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

943

do {

944

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

945

if(quit_now){

946

errno = EINTR;

947

goto mandos_end;

948

}

949

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

744

950

745

951

if(buffer_length > 0){

952

ssize_t decrypted_buffer_size;

746

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

954

buffer_length,

748

955

&decrypted_buffer);

749

956

if(decrypted_buffer_size >= 0){

957

750

958

written = 0;

751

959

while(written < (size_t) decrypted_buffer_size){

960

if(quit_now){

961

errno = EINTR;

962

goto mandos_end;

963

}

964

752

965

ret = (int)fwrite(decrypted_buffer + written, 1,

753

966

(size_t)decrypted_buffer_size - written,

754

967

stdout);

755

968

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

969

int e = errno;

756

970

if(debug){

757

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

971

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

972

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

758

973

strerror(errno));

759

974

}

760

retval = -1;

761

break;

975

errno = e;

976

goto mandos_end;

762

977

}

763

978

written += (size_t)ret;

764

979

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

980

retval = 0;

768

981

}

769

} else {

770

retval = -1;

771

982

}

772

983

773

984

/* Shutdown procedure */

774

985

775

986

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

987

{

988

int e = errno;

989

free(decrypted_buffer);

990

free(buffer);

991

if(tcp_sd >= 0){

992

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

993

}

994

if(ret == -1){

995

if(e == 0){

996

e = errno;

997

}

998

perror_plus("close");

999

}

1000

gnutls_deinit(session);

1001

errno = e;

1002

if(quit_now){

1003

errno = EINTR;

1004

retval = -1;

1005

}

780

1006

}

781

gnutls_deinit(session);

782

1007

return retval;

783

1008

}

784

1009

801

1026

/* Called whenever a service has been resolved successfully or

802

1027

timed out */

803

1028

1029

if(quit_now){

1030

return;

1031

}

1032

804

1033

switch(event){

805

1034

default:

806

1035

case AVAHI_RESOLVER_FAILURE:

807

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

1036

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

1037

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

808

1038

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

809

1039

avahi_strerror(avahi_server_errno(mc.server)));

810

1040

break;

814

1044

char ip[AVAHI_ADDRESS_STR_MAX];

815

1045

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

816

1046

if(debug){

817

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

1047

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

1048

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

818

1049

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

819

1050

ip, (intmax_t)interface, port);

820

1051

}

822

1053

avahi_proto_to_af(proto));

823

1054

if(ret == 0){

824

1055

avahi_simple_poll_quit(mc.simple_poll);

1056

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

825

1059

}

826

1060

}

827

1061

}

843

1077

/* Called whenever a new services becomes available on the LAN or

844

1078

is removed from the LAN */

845

1079

1080

if(quit_now){

1081

return;

1082

}

1083

846

1084

switch(event){

847

1085

default:

848

1086

case AVAHI_BROWSER_FAILURE:

849

1087

850

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

1088

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

1089

"(Avahi browser) %s\n",

851

1090

avahi_strerror(avahi_server_errno(mc.server)));

852

1091

avahi_simple_poll_quit(mc.simple_poll);

853

1092

return;

861

1100

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

862

1101

name, type, domain, protocol, 0,

863

1102

resolve_callback, NULL) == NULL)

864

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

1103

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

1104

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

865

1105

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

866

1106

break;

867

1107

871

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

872

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

873

1113

if(debug){

874

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

1114

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

1115

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

875

1116

}

876

1117

break;

877

1118

}

878

1119

}

879

1120

880

sig_atomic_t quit_now = 0;

881

882

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

883

static void handle_sigterm(__attribute__((unused)) int sig){

1121

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

1122

static void handle_sigterm(int sig){

884

1123

if(quit_now){

885

1124

return;

886

1125

}

887

1126

quit_now = 1;

1127

signal_received = sig;

888

1128

int old_errno = errno;

1129

/* set main loop to exit */

889

1130

if(mc.simple_poll != NULL){

890

1131

avahi_simple_poll_quit(mc.simple_poll);

891

1132

}

892

1133

errno = old_errno;

893

1134

}

894

1135

1136

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

1137

int ret;

1138

1139

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

1140

if(s < 0){

1141

perror_plus("socket");

1142

return false;

1143

}

1144

strcpy(ifr->ifr_name, ifname);

1145

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1146

if(ret == -1){

1147

if(debug){

1148

perror_plus("ioctl SIOCGIFFLAGS");

1149

}

1150

return false;

1151

}

1152

return true;

1153

}

1154

1155

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

1156

1157

/* Reject the loopback device */

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

if(debug){

1160

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

1161

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

1162

}

1163

return false;

1164

}

1165

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

1166

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

1167

if(debug){

1168

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

1169

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

1170

}

1171

return true;

1172

}

1173

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

1174

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

1175

if(debug){

1176

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

1177

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

1178

}

1179

return false;

1180

}

1181

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

1182

if(ifr->ifr_flags & IFF_NOARP){

1183

if(debug){

1184

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

1185

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

1186

}

1187

return false;

1188

}

1189

1190

/* Accept this device */

1191

if(debug){

1192

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

1193

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

1194

}

1195

return true;

1196

}

1197

1198

/*

1199

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

1200

* corresponds to an acceptable network device.

1201

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

1202

*/

1203

int good_interface(const struct dirent *if_entry){

1204

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

1205

return 0;

1206

}

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

if_entry->d_name);

1214

}

1215

return 0;

1216

}

1217

1218

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

1219

return 0;

1220

}

1221

return 1;

1222

}

1223

1224

/*

1225

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

1226

* corresponds to an acceptable network device which is up.

1227

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

1228

*/

1229

int up_interface(const struct dirent *if_entry){

1230

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

1231

return 0;

1232

}

1233

1234

struct ifreq ifr;

1235

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

1236

if(debug){

1237

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

1238

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

1239

if_entry->d_name);

1240

}

1241

return 0;

1242

}

1243

1244

/* Reject down interfaces */

1245

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

1246

if(debug){

1247

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

1248

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

1249

if_entry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

/* Reject non-running interfaces */

1255

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

1256

if(debug){

1257

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

1258

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

1259

if_entry->d_name);

1260

}

1261

return 0;

1262

}

1263

1264

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

1265

return 0;

1266

}

1267

return 1;

1268

}

1269

1270

int notdotentries(const struct dirent *direntry){

1271

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

1272

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

1273

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

1274

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

1275

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

1276

return 0;

1277

}

1278

return 1;

1279

}

1280

1281

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

1282

int runnable_hook(const struct dirent *direntry){

1283

int ret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

/* Save pointer to last character */

1292

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

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

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

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

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

1308

if(ret == -1){

1309

if(debug){

1310

perror_plus("Could not stat plugin");

1311

}

1312

return 0;

1313

}

1314

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

1315

/* Not a regular file */

1316

return 0;

1317

}

1318

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

1319

/* Not executable */

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1326

int ret;

1327

struct timespec now;

1328

struct timespec waited_time;

1329

intmax_t block_time;

1330

1331

while(true){

1332

if(mc.current_server == NULL){

1333

if (debug){

1334

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

1335

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

1336

}

1337

ret = avahi_simple_poll_iterate(s, -1);

1338

} else {

1339

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1343

}

1344

/* the current time */

1345

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1346

if(ret == -1){

1347

perror_plus("clock_gettime");

1348

return -1;

1349

}

1350

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

1351

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

1352

waited_time.tv_sec = (now.tv_sec

1353

- mc.current_server->last_seen.tv_sec);

1354

waited_time.tv_nsec = (now.tv_nsec

1355

- mc.current_server->last_seen.tv_nsec);

1356

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

1357

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

1358

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

1359

block_time = ((retry_interval

1360

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

1361

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

1362

1363

if (debug){

1364

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

1365

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

1366

}

1367

1368

if(block_time <= 0){

1369

ret = start_mandos_communication(mc.current_server->ip,

1370

mc.current_server->port,

1371

mc.current_server->if_index,

1372

mc.current_server->af);

1373

if(ret == 0){

1374

avahi_simple_poll_quit(mc.simple_poll);

1375

return 0;

1376

}

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1378

&mc.current_server->last_seen);

1379

if(ret == -1){

1380

perror_plus("clock_gettime");

1381

return -1;

1382

}

1383

mc.current_server = mc.current_server->next;

1384

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

1385

servers, but don't block */

1386

}

1387

1388

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

1389

}

1390

if(ret != 0){

1391

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

1392

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

1393

}

1394

}

1395

}

1396

}

1397

895

1398

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

896

1399

AvahiSServiceBrowser *sb = NULL;

897

1400

int error;

899

1402

intmax_t tmpmax;

900

1403

char *tmp;

901

1404

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1405

const char *interface = "";

903

1406

struct ifreq network;

904

int sd;

1407

int sd = -1;

1408

bool take_down_interface = false;

905

1409

uid_t uid;

906

1410

gid_t gid;

907

char *connect_to = NULL;

908

1411

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

909

1412

bool tempdir_created = false;

910

1413

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1417

bool gnutls_initialized = false;

915

1418

bool gpgme_initialized = false;

916

1419

float delay = 2.5f;

1420

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

1421

retrying the same server again */

917

1422

918

struct sigaction old_sigterm_action;

1423

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1424

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1425

1426

uid = getuid();

1427

gid = getgid();

1428

1429

/* Lower any group privileges we might have, just to be safe */

1430

errno = 0;

1431

ret = setgid(gid);

1432

if(ret == -1){

1433

perror_plus("setgid");

1434

}

1435

1436

/* Lower user privileges (temporarily) */

1437

errno = 0;

1438

ret = seteuid(uid);

1439

if(ret == -1){

1440

perror_plus("seteuid");

1441

}

1442

1443

if(quit_now){

1444

goto end;

1445

}

1446

921

1447

{

922

1448

struct argp_option options[] = {

923

1449

{ .name = "debug", .key = 128,

952

1478

.arg = "SECONDS",

953

1479

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

954

1480

.group = 2 },

1481

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

1482

.arg = "SECONDS",

1483

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

1484

.group = 2 },

1485

/*

1486

* These reproduce what we would get without ARGP_NO_HELP

1487

*/

1488

{ .name = "help", .key = '?',

1489

.doc = "Give this help list", .group = -1 },

1490

{ .name = "usage", .key = -3,

1491

.doc = "Give a short usage message", .group = -1 },

1492

{ .name = "version", .key = 'V',

1493

.doc = "Print program version", .group = -1 },

955

1494

{ .name = NULL }

956

1495

};

957

1496

958

1497

error_t parse_opt(int key, char *arg,

959

1498

struct argp_state *state){

1499

errno = 0;

960

1500

switch(key){

961

1501

case 128: /* --debug */

962

1502

debug = true;

978

1518

tmpmax = strtoimax(arg, &tmp, 10);

979

1519

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

980

1520

or tmpmax != (typeof(mc.dh_bits))tmpmax){

981

fprintf(stderr, "Bad number of DH bits\n");

982

exit(EXIT_FAILURE);

1521

argp_error(state, "Bad number of DH bits");

983

1522

}

984

1523

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

985

1524

break;

990

1529

errno = 0;

991

1530

delay = strtof(arg, &tmp);

992

1531

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

993

fprintf(stderr, "Bad delay\n");

994

exit(EXIT_FAILURE);

1532

argp_error(state, "Bad delay");

1533

}

1534

case 132: /* --retry */

1535

errno = 0;

1536

retry_interval = strtod(arg, &tmp);

1537

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

1538

or (retry_interval * 1000) > INT_MAX

1539

or retry_interval < 0){

1540

argp_error(state, "Bad retry interval");

995

1541

}

996

1542

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1543

/*

1544

* These reproduce what we would get without ARGP_NO_HELP

1545

*/

1546

case '?': /* --help */

1547

argp_state_help(state, state->out_stream,

1548

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1549

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1550

case -3: /* --usage */

1551

argp_state_help(state, state->out_stream,

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

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

1554

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

1555

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

1556

exit(argp_err_exit_status);

1000

1557

break;

1001

1558

default:

1002

1559

return ARGP_ERR_UNKNOWN;

1003

1560

}

1004

return 0;

1561

return errno;

1005

1562

}

1006

1563

1007

1564

struct argp argp = { .options = options, .parser = parse_opt,

1008

1565

.args_doc = "",

1009

1566

.doc = "Mandos client -- Get and decrypt"

1010

1567

" passwords from a Mandos server" };

1011

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

fprintf(stderr, "Unknown error while parsing arguments\n");

1014

exitcode = EXIT_FAILURE;

1015

goto end;

1568

ret = argp_parse(&argp, argc, argv,

1569

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1570

switch(ret){

1571

case 0:

1572

break;

1573

case ENOMEM:

1574

default:

1575

errno = ret;

1576

perror_plus("argp_parse");

1577

exitcode = EX_OSERR;

1578

goto end;

1579

case EINVAL:

1580

exitcode = EX_USAGE;

1581

goto end;

1582

}

1583

}

1584

1585

{

1586

/* Work around Debian bug #633582:

1587

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

1588

struct stat st;

1589

1590

/* Re-raise priviliges */

1591

errno = 0;

1592

ret = seteuid(0);

1593

if(ret == -1){

1594

perror_plus("seteuid");

1595

}

1596

1597

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

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

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

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

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

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

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

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

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

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

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

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

} else {

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

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

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

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

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

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

1711

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

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1719

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

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

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

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1016

1737

}

1017

1738

}

1018

1739

1020

1741

avahi_set_log_function(empty_log);

1021

1742

}

1022

1743

1744

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

1745

struct dirent **direntries;

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1748

alphasort);

1749

if(ret == 0){

1750

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

1751

free(direntries);

1752

ret = scandir(sys_class_net, &direntries, good_interface,

1753

alphasort);

1754

}

1755

if(ret >= 1){

1756

/* Pick the first interface returned */

1757

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

1758

if(debug){

1759

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

1760

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

1761

}

1762

if(interface == NULL){

1763

perror_plus("malloc");

1764

free(direntries);

1765

exitcode = EXIT_FAILURE;

1766

goto end;

1767

}

1768

free(direntries);

1769

} else {

1770

free(direntries);

1771

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

1772

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

1773

exitcode = EXIT_FAILURE;

1774

goto end;

1775

}

1776

}

1777

1023

1778

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

1024

1779

from the signal handler */

1025

1780

/* Initialize the pseudo-RNG for Avahi */

1026

1781

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

1027

1782

mc.simple_poll = avahi_simple_poll_new();

1028

1783

if(mc.simple_poll == NULL){

1029

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

1030

exitcode = EXIT_FAILURE;

1784

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

1785

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

1786

exitcode = EX_UNAVAILABLE;

1031

1787

goto end;

1032

1788

}

1033

1789

1034

1790

sigemptyset(&sigterm_action.sa_mask);

1035

1791

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

1036

1792

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1793

perror_plus("sigaddset");

1794

exitcode = EX_OSERR;

1039

1795

goto end;

1040

1796

}

1041

1797

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

1042

1798

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1799

perror_plus("sigaddset");

1800

exitcode = EX_OSERR;

1045

1801

goto end;

1046

1802

}

1047

1803

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

1048

1804

if(ret == -1){

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1805

perror_plus("sigaddset");

1806

exitcode = EX_OSERR;

1807

goto end;

1808

}

1809

/* Need to check if the handler is SIG_IGN before handling:

1810

| [[info:libc:Initial Signal Actions]] |

1811

| [[info:libc:Basic Signal Handling]] |

1812

*/

1813

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

1814

if(ret == -1){

1815

perror_plus("sigaction");

1816

return EX_OSERR;

1817

}

1818

if(old_sigterm_action.sa_handler != SIG_IGN){

1819

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

1820

if(ret == -1){

1821

perror_plus("sigaction");

1822

exitcode = EX_OSERR;

1823

goto end;

1824

}

1825

}

1826

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

1827

if(ret == -1){

1828

perror_plus("sigaction");

1829

return EX_OSERR;

1830

}

1831

if(old_sigterm_action.sa_handler != SIG_IGN){

1832

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

1833

if(ret == -1){

1834

perror_plus("sigaction");

1835

exitcode = EX_OSERR;

1836

goto end;

1837

}

1838

}

1839

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

1840

if(ret == -1){

1841

perror_plus("sigaction");

1842

return EX_OSERR;

1843

}

1844

if(old_sigterm_action.sa_handler != SIG_IGN){

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

exitcode = EX_OSERR;

1849

goto end;

1850

}

1851

}

1059

1852

1060

1853

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

1061

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

1854

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

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

if(if_index == 0){

1857

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

1858

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

1859

exitcode = EX_UNAVAILABLE;

1860

goto end;

1861

}

1862

1863

if(quit_now){

1864

goto end;

1865

}

1866

1867

/* Re-raise priviliges */

1868

errno = 0;

1869

ret = seteuid(0);

1870

if(ret == -1){

1871

perror_plus("seteuid");

1872

}

1873

1062

1874

#ifdef __linux__

1063

1875

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1876

messages about the network interface to mess up the prompt */

1065

1877

ret = klogctl(8, NULL, 5);

1066

1878

bool restore_loglevel = true;

1067

1879

if(ret == -1){

1068

1880

restore_loglevel = false;

1069

perror("klogctl");

1881

perror_plus("klogctl");

1070

1882

}

1071

1883

#endif /* __linux__ */

1072

1884

1073

1885

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1886

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1887

perror_plus("socket");

1888

exitcode = EX_OSERR;

1077

1889

#ifdef __linux__

1078

1890

if(restore_loglevel){

1079

1891

ret = klogctl(7, NULL, 0);

1080

1892

if(ret == -1){

1081

perror("klogctl");

1893

perror_plus("klogctl");

1082

1894

}

1083

1895

}

1084

1896

#endif /* __linux__ */

1897

/* Lower privileges */

1898

errno = 0;

1899

ret = seteuid(uid);

1900

if(ret == -1){

1901

perror_plus("seteuid");

1902

}

1085

1903

goto end;

1086

1904

}

1087

1905

strcpy(network.ifr_name, interface);

1088

1906

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

1089

1907

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1908

perror_plus("ioctl SIOCGIFFLAGS");

1091

1909

#ifdef __linux__

1092

1910

if(restore_loglevel){

1093

1911

ret = klogctl(7, NULL, 0);

1094

1912

if(ret == -1){

1095

perror("klogctl");

1913

perror_plus("klogctl");

1096

1914

}

1097

1915

}

1098

1916

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1917

exitcode = EX_OSERR;

1918

/* Lower privileges */

1919

errno = 0;

1920

ret = seteuid(uid);

1921

if(ret == -1){

1922

perror_plus("seteuid");

1923

}

1100

1924

goto end;

1101

1925

}

1102

1926

if((network.ifr_flags & IFF_UP) == 0){

1103

1927

network.ifr_flags |= IFF_UP;

1928

take_down_interface = true;

1104

1929

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

1105

1930

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1931

take_down_interface = false;

1932

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1933

exitcode = EX_OSERR;

1108

1934

#ifdef __linux__

1109

1935

if(restore_loglevel){

1110

1936

ret = klogctl(7, NULL, 0);

1111

1937

if(ret == -1){

1112

perror("klogctl");

1938

perror_plus("klogctl");

1113

1939

}

1114

1940

}

1115

1941

#endif /* __linux__ */

1942

/* Lower privileges */

1943

errno = 0;

1944

ret = seteuid(uid);

1945

if(ret == -1){

1946

perror_plus("seteuid");

1947

}

1116

1948

goto end;

1117

1949

}

1118

1950

}

1119

/* sleep checking until interface is running */

1951

/* Sleep checking until interface is running.

1952

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

1120

1953

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

1121

1954

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

1122

1955

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1956

perror_plus("ioctl SIOCGIFFLAGS");

1124

1957

} else if(network.ifr_flags & IFF_RUNNING){

1125

1958

break;

1126

1959

}

1127

1960

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1961

ret = nanosleep(&sleeptime, NULL);

1129

1962

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

1130

perror("nanosleep");

1963

perror_plus("nanosleep");

1131

1964

}

1132

1965

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1966

if(not take_down_interface){

1967

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

1968

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

1969

if(ret == -1){

1970

perror_plus("close");

1971

}

1136

1972

}

1137

1973

#ifdef __linux__

1138

1974

if(restore_loglevel){

1139

1975

/* Restores kernel loglevel to default */

1140

1976

ret = klogctl(7, NULL, 0);

1141

1977

if(ret == -1){

1142

perror("klogctl");

1978

perror_plus("klogctl");

1143

1979

}

1144

1980

}

1145

1981

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1982

/* Lower privileges */

1983

errno = 0;

1984

if(take_down_interface){

1985

/* Lower privileges */

1986

ret = seteuid(uid);

1987

if(ret == -1){

1988

perror_plus("seteuid");

1989

}

1990

} else {

1991

/* Lower privileges permanently */

1992

ret = setuid(uid);

1993

if(ret == -1){

1994

perror_plus("setuid");

1995

}

1996

}

1997

}

1998

1999

if(quit_now){

2000

goto end;

1160

2001

}

1161

2002

1162

2003

ret = init_gnutls_global(pubkey, seckey);

1163

2004

if(ret == -1){

1164

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

1165

exitcode = EXIT_FAILURE;

2005

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

2006

"init_gnutls_global failed\n");

2007

exitcode = EX_UNAVAILABLE;

1166

2008

goto end;

1167

2009

} else {

1168

2010

gnutls_initialized = true;

1169

2011

}

1170

2012

2013

if(quit_now){

2014

goto end;

2015

}

2016

1171

2017

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

2018

perror_plus("mkdtemp");

1173

2019

goto end;

1174

2020

}

1175

2021

tempdir_created = true;

1176

2022

2023

if(quit_now){

2024

goto end;

2025

}

2026

1177

2027

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

1178

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

1179

exitcode = EXIT_FAILURE;

2028

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

2029

"init_gpgme failed\n");

2030

exitcode = EX_UNAVAILABLE;

1180

2031

goto end;

1181

2032

} else {

1182

2033

gpgme_initialized = true;

1183

2034

}

1184

2035

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

2036

if(quit_now){

2037

goto end;

1192

2038

}

1193

2039

1194

2040

if(connect_to != NULL){

1196

2042

/* (Mainly meant for debugging) */

1197

2043

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

1198

2044

if(address == NULL){

1199

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

2045

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

2046

"No colon in address\n");

2047

exitcode = EX_USAGE;

2048

goto end;

2049

}

2050

2051

if(quit_now){

2052

goto end;

2053

}

2054

1203

2055

uint16_t port;

1204

2056

errno = 0;

1205

2057

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

1206

2058

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

1207

2059

or tmpmax != (uint16_t)tmpmax){

1208

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2060

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

2061

"Bad port number\n");

2062

exitcode = EX_USAGE;

2063

goto end;

2064

}

2065

2066

if(quit_now){

2067

goto end;

2068

}

2069

1212

2070

port = (uint16_t)tmpmax;

1213

2071

*address = '\0';

1214

address = connect_to;

1215

2072

/* Colon in address indicates IPv6 */

1216

2073

int af;

1217

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

2074

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

1218

2075

af = AF_INET6;

2076

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

2077

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

2078

{

2079

connect_to++;

2080

address[-1] = '\0';

2081

}

1219

2082

} else {

1220

2083

af = AF_INET;

1221

2084

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2085

address = connect_to;

2086

2087

if(quit_now){

2088

goto end;

2089

}

2090

2091

while(not quit_now){

2092

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

2093

if(quit_now or ret == 0){

2094

break;

2095

}

2096

if(debug){

2097

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

2098

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

2099

}

2100

sleep((int)retry_interval);

2101

}

2102

2103

if (not quit_now){

1226

2104

exitcode = EXIT_SUCCESS;

1227

2105

}

1228

goto end;

1229

}

1230

2106

2107

goto end;

2108

}

2109

2110

if(quit_now){

2111

goto end;

2112

}

2113

1231

2114

{

1232

2115

AvahiServerConfig config;

1233

2116

/* Do not publish any local Zeroconf records */

1248

2131

1249

2132

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

1250

2133

if(mc.server == NULL){

1251

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

2134

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

2135

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

1252

2136

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2137

exitcode = EX_UNAVAILABLE;

2138

goto end;

2139

}

2140

2141

if(quit_now){

1254

2142

goto end;

1255

2143

}

1256

2144

1259

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

2148

NULL, 0, browse_callback, NULL);

1261

2149

if(sb == NULL){

1262

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

2150

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

2151

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

1263

2152

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2153

exitcode = EX_UNAVAILABLE;

2154

goto end;

2155

}

2156

2157

if(quit_now){

1265

2158

goto end;

1266

2159

}

1267

2160

1268

2161

/* Run the main loop */

1269

2162

1270

2163

if(debug){

1271

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

1272

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2164

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

2165

"Starting Avahi loop search\n");

2166

}

2167

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

(int)(retry_interval * 1000));

2170

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2174

}

1275

2175

1276

2176

end:

1277

2177

1278

2178

if(debug){

1279

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

2179

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

2180

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

1280

2181

}

1281

2182

1282

2183

/* Cleanup things */

1298

2199

if(gpgme_initialized){

1299

2200

gpgme_release(mc.ctx);

1300

2201

}

1301

1302

/* Removes the temp directory used by GPGME */

2202

2203

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

2204

has seen */

2205

if(mc.current_server != NULL){

2206

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

2207

while(mc.current_server != NULL){

2208

server *next = mc.current_server->next;

2209

free(mc.current_server);

2210

mc.current_server = next;

2211

}

2212

}

2213

2214

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

2215

2216

/* Take down the network interface */

2217

if(take_down_interface){

2218

/* Re-raise priviliges */

2219

errno = 0;

2220

ret = seteuid(0);

2221

if(ret == -1){

2222

perror_plus("seteuid");

2223

}

2224

if(geteuid() == 0){

2225

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

2226

if(ret == -1){

2227

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

2229

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

2230

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

2231

if(ret == -1){

2232

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2233

}

2234

}

2235

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

2236

if(ret == -1){

2237

perror_plus("close");

2238

}

2239

/* Lower privileges permanently */

2240

errno = 0;

2241

ret = setuid(uid);

2242

if(ret == -1){

2243

perror_plus("setuid");

2244

}

2245

}

2246

}

2247

2248

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

1303

2249

if(tempdir_created){

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

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

1318

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

1319

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

1320

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

1321

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

1322

continue;

1323

}

2250

struct dirent **direntries = NULL;

2251

struct dirent *direntry = NULL;

2252

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

2253

alphasort);

2254

if (numentries > 0){

2255

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

2256

direntry = direntries[i];

1324

2257

char *fullname = NULL;

1325

2258

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

1326

2259

direntry->d_name);

1327

2260

if(ret < 0){

1328

perror("asprintf");

2261

perror_plus("asprintf");

1329

2262

continue;

1330

2263

}

1331

2264

ret = remove(fullname);

1332

2265

if(ret == -1){

1333

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

1334

strerror(errno));

2266

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

2267

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

1335

2268

}

1336

2269

free(fullname);

1337

2270

}

1338

closedir(d);

2271

}

2272

2273

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

2274

free(direntries);

2275

if (numentries == -1){

2276

perror_plus("scandir");

1339

2277

}

1340

2278

ret = rmdir(tempdir);

1341

2279

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

1342

perror("rmdir");

1343

}

2280

perror_plus("rmdir");

2281

}

2282

}

2283

2284

if(quit_now){

2285

sigemptyset(&old_sigterm_action.sa_mask);

2286

old_sigterm_action.sa_handler = SIG_DFL;

2287

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2288

&old_sigterm_action,

2289

NULL));

2290

if(ret == -1){

2291

perror_plus("sigaction");

2292

}

2293

do {

2294

ret = raise(signal_received);

2295

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

2296

if(ret != 0){

2297

perror_plus("raise");

2298

abort();

2299

}

2300

TEMP_FAILURE_RETRY(pause());

1344

2301

}

1345

2302

1346

2303

return exitcode;