/mandos/release : revision 237.16.13

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

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,

47

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() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

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() */

105

110

init_gnutls_session(),

106

111

GNUTLS_* */

107

112

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

110

115

111

116

/* GPGME */

112

117

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

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

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;

128

148

129

149

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

130

150

typedef struct {

135

155

gnutls_dh_params_t dh_params;

136

156

const char *priority;

137

157

gpgme_ctx_t ctx;

158

server *current_server;

138

159

} mandos_context;

139

160

140

161

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

141

162

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

142

163

.dh_bits = 1024, .priority = "SECURE256"

143

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

164

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

165

.current_server = NULL };

166

167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

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

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

144

185

145

186

/*

146

187

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

148

189

* "buffer_length" is how much is already used.

149

190

*/

150

191

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

192

size_t buffer_capacity){

152

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

194

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

154

195

if(buffer == NULL){

159

200

return buffer_capacity;

160

201

}

161

202

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

162

240

/*

163

241

* Initialize GPGME.

164

242

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

243

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

244

const char *tempdir){

168

245

gpgme_error_t rc;

169

246

gpgme_engine_info_t engine_info;

170

247

173

250

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

174

251

*/

175

252

bool import_key(const char *filename){

253

int ret;

176

254

int fd;

177

255

gpgme_data_t pgp_data;

178

256

179

257

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

180

258

if(fd == -1){

181

perror("open");

259

perror_plus("open");

182

260

return false;

183

261

}

184

262

185

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

264

if(rc != GPG_ERR_NO_ERROR){

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

189

267

return false;

190

268

}

191

269

192

270

rc = gpgme_op_import(mc.ctx, pgp_data);

193

271

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

196

274

return false;

197

275

}

198

276

199

277

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

200

278

if(ret == -1){

201

perror("close");

279

perror_plus("close");

202

280

}

203

281

gpgme_data_release(pgp_data);

204

282

return true;

205

283

}

206

284

207

285

if(debug){

208

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

286

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

209

287

}

210

288

211

289

/* Init GPGME */

212

290

gpgme_check_version(NULL);

213

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

292

if(rc != GPG_ERR_NO_ERROR){

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

217

295

return false;

218

296

}

219

297

220

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

298

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

221

299

rc = gpgme_get_engine_info(&engine_info);

222

300

if(rc != GPG_ERR_NO_ERROR){

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

225

303

return false;

226

304

}

227

305

while(engine_info != NULL){

233

311

engine_info = engine_info->next;

234

312

}

235

313

if(engine_info == NULL){

236

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

314

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

315

tempdir);

237

316

return false;

238

317

}

239

318

240

319

/* Create new GPGME "context" */

241

320

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

242

321

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

245

325

return false;

246

326

}

247

327

249

329

return false;

250

330

}

251

331

252

return true;

332

return true;

253

333

}

254

334

255

335

/*

266

346

ssize_t plaintext_length = 0;

267

347

268

348

if(debug){

269

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

349

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

270

350

}

271

351

272

352

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

273

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

354

0);

275

355

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

278

358

return -1;

279

359

}

280

360

281

361

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

282

362

rc = gpgme_data_new(&dh_plain);

283

363

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

286

367

gpgme_data_release(dh_crypto);

287

368

return -1;

288

369

}

291

372

data buffer */

292

373

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

293

374

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

296

377

plaintext_length = -1;

297

378

if(debug){

298

379

gpgme_decrypt_result_t result;

299

380

result = gpgme_op_decrypt_result(mc.ctx);

300

381

if(result == NULL){

301

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

382

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

302

383

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

307

388

if(result->file_name != NULL){

308

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

389

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

309

390

}

310

391

gpgme_recipient_t recipient;

311

392

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

}

393

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

401

recipient = recipient->next;

322

402

}

323

403

}

324

404

}

326

406

}

327

407

328

408

if(debug){

329

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

409

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

330

410

}

331

411

332

412

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

333

413

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

334

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

335

415

plaintext_length = -1;

336

416

goto decrypt_end;

337

417

}

339

419

*plaintext = NULL;

340

420

while(true){

341

421

plaintext_capacity = incbuffer(plaintext,

342

(size_t)plaintext_length,

343

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

344

424

if(plaintext_capacity == 0){

345

perror("incbuffer");

346

plaintext_length = -1;

347

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

348

428

}

349

429

350

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

355

435

break;

356

436

}

357

437

if(ret < 0){

358

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

359

439

plaintext_length = -1;

360

440

goto decrypt_end;

361

441

}

363

443

}

364

444

365

445

if(debug){

366

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

446

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

367

447

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

368

448

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

369

449

}

391

471

/* GnuTLS log function callback */

392

472

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

393

473

const char* string){

394

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

474

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

395

475

}

396

476

397

477

static int init_gnutls_global(const char *pubkeyfilename,

399

479

int ret;

400

480

401

481

if(debug){

402

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

482

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

403

483

}

404

484

405

485

ret = gnutls_global_init();

406

486

if(ret != GNUTLS_E_SUCCESS){

407

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

408

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

409

489

return -1;

410

490

}

411

491

418

498

}

419

499

420

500

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

502

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));

503

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

504

safer_gnutls_strerror(ret));

428

505

gnutls_global_deinit();

429

506

return -1;

430

507

}

431

508

432

509

if(debug){

433

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

434

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

435

seckeyfilename);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

436

514

}

437

515

438

516

ret = gnutls_certificate_set_openpgp_key_file

439

517

(mc.cred, pubkeyfilename, seckeyfilename,

440

518

GNUTLS_OPENPGP_FMT_BASE64);

441

519

if(ret != GNUTLS_E_SUCCESS){

442

fprintf(stderr,

443

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

444

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

445

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

446

safer_gnutls_strerror(ret));

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

447

525

goto globalfail;

448

526

}

449

527

450

528

/* GnuTLS server initialization */

451

529

ret = gnutls_dh_params_init(&mc.dh_params);

452

530

if(ret != GNUTLS_E_SUCCESS){

453

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

454

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

455

534

goto globalfail;

456

535

}

457

536

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

458

537

if(ret != GNUTLS_E_SUCCESS){

459

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

460

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

461

540

goto globalfail;

462

541

}

463

542

476

555

static int init_gnutls_session(gnutls_session_t *session){

477

556

int ret;

478

557

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

558

do {

559

ret = gnutls_init(session, GNUTLS_SERVER);

560

if(quit_now){

561

return -1;

562

}

563

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

480

564

if(ret != GNUTLS_E_SUCCESS){

481

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

482

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

483

568

}

484

569

485

570

{

486

571

const char *err;

487

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

572

do {

573

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

574

if(quit_now){

575

gnutls_deinit(*session);

576

return -1;

577

}

578

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

488

579

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));

580

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

581

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

582

safer_gnutls_strerror(ret));

492

583

gnutls_deinit(*session);

493

584

return -1;

494

585

}

495

586

}

496

587

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

588

do {

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

591

if(quit_now){

592

gnutls_deinit(*session);

593

return -1;

594

}

595

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

499

596

if(ret != GNUTLS_E_SUCCESS){

500

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

501

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

502

599

gnutls_deinit(*session);

503

600

return -1;

504

601

}

505

602

506

603

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

605

510

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

607

520

616

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

521

617

AvahiIfIndex if_index,

522

618

int af){

523

int ret, tcp_sd;

619

int ret, tcp_sd = -1;

524

620

ssize_t sret;

525

621

union {

526

622

struct sockaddr_in in;

527

623

struct sockaddr_in6 in6;

528

624

} to;

529

625

char *buffer = NULL;

530

char *decrypted_buffer;

626

char *decrypted_buffer = NULL;

531

627

size_t buffer_length = 0;

532

628

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

629

size_t written;

535

int retval = 0;

630

int retval = -1;

536

631

gnutls_session_t session;

537

632

int pf; /* Protocol family */

538

633

634

errno = 0;

635

636

if(quit_now){

637

errno = EINTR;

638

return -1;

639

}

640

539

641

switch(af){

540

642

case AF_INET6:

541

643

pf = PF_INET6;

544

646

pf = PF_INET;

545

647

break;

546

648

default:

547

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

649

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

650

errno = EINVAL;

548

651

return -1;

549

652

}

550

653

554

657

}

555

658

556

659

if(debug){

557

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

558

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

559

662

}

560

663

561

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

665

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

666

int e = errno;

667

perror_plus("socket");

668

errno = e;

669

goto mandos_end;

670

}

671

672

if(quit_now){

673

errno = EINTR;

674

goto mandos_end;

565

675

}

566

676

567

677

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

568

678

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

679

to.in6.sin6_family = (sa_family_t)af;

570

680

ret = inet_pton(af, ip, &to.in6.sin6_addr);

571

681

} else { /* IPv4 */

572

682

to.in.sin_family = (sa_family_t)af;

573

683

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

574

684

}

575

685

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

689

goto mandos_end;

578

690

}

579

691

if(ret == 0){

580

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

581

return -1;

692

int e = errno;

693

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

694

errno = e;

695

goto mandos_end;

582

696

}

583

697

if(af == AF_INET6){

584

698

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

587

701

588

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

589

703

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

590

-Wunreachable-code*/

704

-Wunreachable-code*/

591

705

if(if_index == AVAHI_IF_UNSPEC){

592

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

593

" without a network interface\n");

594

return -1;

706

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

707

" incomplete without a network interface\n");

708

errno = EINVAL;

709

goto mandos_end;

595

710

}

596

711

/* Set the network interface number as scope */

597

712

to.in6.sin6_scope_id = (uint32_t)if_index;

602

717

-Wunreachable-code */

603

718

}

604

719

720

if(quit_now){

721

errno = EINTR;

722

goto mandos_end;

723

}

724

605

725

if(debug){

606

726

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

607

727

char interface[IF_NAMESIZE];

608

728

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

609

perror("if_indextoname");

729

perror_plus("if_indextoname");

610

730

} else {

611

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

612

ip, interface, port);

731

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

732

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

613

733

}

614

734

} else {

615

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

616

port);

735

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

736

ip, port);

617

737

}

618

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

626

746

sizeof(addrstr));

627

747

}

628

748

if(pcret == NULL){

629

perror("inet_ntop");

749

perror_plus("inet_ntop");

630

750

} else {

631

751

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

632

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

752

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

633

753

}

634

754

}

635

755

}

636

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

637

762

if(af == AF_INET6){

638

763

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

639

764

} else {

640

765

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

641

766

}

642

767

if(ret < 0){

643

perror("connect");

644

return -1;

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

773

goto mandos_end;

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

645

779

}

646

780

647

781

const char *out = mandos_protocol_version;

649

783

while(true){

650

784

size_t out_size = strlen(out);

651

785

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

652

out_size - written));

786

out_size - written));

653

787

if(ret == -1){

654

perror("write");

655

retval = -1;

788

int e = errno;

789

perror_plus("write");

790

errno = e;

656

791

goto mandos_end;

657

792

}

658

793

written += (size_t)ret;

666

801

break;

667

802

}

668

803

}

804

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

669

809

}

670

810

671

811

if(debug){

672

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

673

}

674

812

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

813

}

814

815

if(quit_now){

816

errno = EINTR;

817

goto mandos_end;

818

}

819

820

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

675

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

822

677

do{

823

if(quit_now){

824

errno = EINTR;

825

goto mandos_end;

826

}

827

828

do {

678

829

ret = gnutls_handshake(session);

830

if(quit_now){

831

errno = EINTR;

832

goto mandos_end;

833

}

679

834

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

680

835

681

836

if(ret != GNUTLS_E_SUCCESS){

682

837

if(debug){

683

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

838

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

684

839

gnutls_perror(ret);

685

840

}

686

retval = -1;

841

errno = EPROTO;

687

842

goto mandos_end;

688

843

}

689

844

690

845

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

691

846

692

847

if(debug){

693

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

694

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

695

850

}

696

851

697

852

while(true){

853

854

if(quit_now){

855

errno = EINTR;

856

goto mandos_end;

857

}

858

698

859

buffer_capacity = incbuffer(&buffer, buffer_length,

699

buffer_capacity);

860

buffer_capacity);

700

861

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

862

int e = errno;

863

perror_plus("incbuffer");

864

errno = e;

865

goto mandos_end;

866

}

867

868

if(quit_now){

869

errno = EINTR;

703

870

goto mandos_end;

704

871

}

705

872

714

881

case GNUTLS_E_AGAIN:

715

882

break;

716

883

case GNUTLS_E_REHANDSHAKE:

717

do{

884

do {

718

885

ret = gnutls_handshake(session);

886

887

if(quit_now){

888

errno = EINTR;

889

goto mandos_end;

890

}

719

891

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

720

892

if(ret < 0){

721

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

893

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

894

"***\n");

722

895

gnutls_perror(ret);

723

retval = -1;

896

errno = EPROTO;

724

897

goto mandos_end;

725

898

}

726

899

break;

727

900

default:

728

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

729

" encrypted session with Mandos server\n");

730

retval = -1;

901

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

902

" encrypted session with Mandos server\n");

731

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

732

905

goto mandos_end;

733

906

}

734

907

} else {

737

910

}

738

911

739

912

if(debug){

740

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

741

}

742

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

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

914

}

915

916

if(quit_now){

917

errno = EINTR;

918

goto mandos_end;

919

}

920

921

do {

922

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

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

744

928

745

929

if(buffer_length > 0){

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

buffer_length,

930

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

748

932

&decrypted_buffer);

749

933

if(decrypted_buffer_size >= 0){

934

750

935

written = 0;

751

936

while(written < (size_t) decrypted_buffer_size){

937

if(quit_now){

938

errno = EINTR;

939

goto mandos_end;

940

}

941

752

942

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

753

943

(size_t)decrypted_buffer_size - written,

754

944

stdout);

755

945

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

946

int e = errno;

756

947

if(debug){

757

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

758

strerror(errno));

948

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

949

strerror(errno));

759

950

}

760

retval = -1;

761

break;

951

errno = e;

952

goto mandos_end;

762

953

}

763

954

written += (size_t)ret;

764

955

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

956

retval = 0;

768

957

}

769

} else {

770

retval = -1;

771

958

}

772

959

773

960

/* Shutdown procedure */

774

961

775

962

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

963

{

964

int e = errno;

965

free(decrypted_buffer);

966

free(buffer);

967

if(tcp_sd >= 0){

968

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

969

}

970

if(ret == -1){

971

if(e == 0){

972

e = errno;

973

}

974

perror_plus("close");

975

}

976

gnutls_deinit(session);

977

errno = e;

978

if(quit_now){

979

errno = EINTR;

980

retval = -1;

981

}

780

982

}

781

gnutls_deinit(session);

782

983

return retval;

783

984

}

784

985

801

1002

/* Called whenever a service has been resolved successfully or

802

1003

timed out */

803

1004

1005

if(quit_now){

1006

return;

1007

}

1008

804

1009

switch(event){

805

1010

default:

806

1011

case AVAHI_RESOLVER_FAILURE:

807

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

808

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

809

avahi_strerror(avahi_server_errno(mc.server)));

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

810

1016

break;

811

1017

812

1018

case AVAHI_RESOLVER_FOUND:

814

1020

char ip[AVAHI_ADDRESS_STR_MAX];

815

1021

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

816

1022

if(debug){

817

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

818

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

819

ip, (intmax_t)interface, port);

1023

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

1024

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

1025

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

820

1026

}

821

1027

int ret = start_mandos_communication(ip, port, interface,

822

1028

avahi_proto_to_af(proto));

823

1029

if(ret == 0){

824

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

825

1034

}

826

1035

}

827

1036

}

843

1052

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

844

1053

is removed from the LAN */

845

1054

1055

if(quit_now){

1056

return;

1057

}

1058

846

1059

switch(event){

847

1060

default:

848

1061

case AVAHI_BROWSER_FAILURE:

849

1062

850

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

851

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

852

1065

avahi_simple_poll_quit(mc.simple_poll);

853

1066

return;

854

1067

861

1074

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

862

1075

name, type, domain, protocol, 0,

863

1076

resolve_callback, NULL) == NULL)

864

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

865

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

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

866

1080

break;

867

1081

868

1082

case AVAHI_BROWSER_REMOVE:

871

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

872

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

873

1087

if(debug){

874

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

1088

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

1089

" searching...\n");

875

1090

}

876

1091

break;

877

1092

}

878

1093

}

879

1094

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){

1095

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

1096

static void handle_sigterm(int sig){

884

1097

if(quit_now){

885

1098

return;

886

1099

}

887

1100

quit_now = 1;

1101

signal_received = sig;

888

1102

int old_errno = errno;

1103

/* set main loop to exit */

889

1104

if(mc.simple_poll != NULL){

890

1105

avahi_simple_poll_quit(mc.simple_poll);

891

1106

}

892

1107

errno = old_errno;

893

1108

}

894

1109

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1121

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1123

}

1124

return false;

1125

}

1126

return true;

1127

}

1128

1129

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

1130

1131

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

if(debug){

1134

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

1135

ifname);

1136

}

1137

return false;

1138

}

1139

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

1140

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

1141

if(debug){

1142

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

1143

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

1144

}

1145

return true;

1146

}

1147

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1164

/* Accept this device */

1165

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

if(debug){

1305

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

1306

direntry->d_name);

1307

}

1308

return 1;

1309

}

1310

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1312

int ret;

1313

struct timespec now;

1314

struct timespec waited_time;

1315

intmax_t block_time;

1316

1317

while(true){

1318

if(mc.current_server == NULL){

1319

if (debug){

1320

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

1321

" No timeout!\n");

1322

}

1323

ret = avahi_simple_poll_iterate(s, -1);

1324

} else {

1325

if (debug){

1326

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

1327

" it, or wait\n");

1328

}

1329

/* the current time */

1330

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1331

if(ret == -1){

1332

perror_plus("clock_gettime");

1333

return -1;

1334

}

1335

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

1336

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

1337

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1339

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1341

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

1342

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

1343

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

1344

block_time = ((retry_interval

1345

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

1346

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

1347

1348

if (debug){

1349

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

1350

block_time);

1351

}

1352

1353

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1358

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1360

return 0;

1361

}

1362

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1364

if(ret == -1){

1365

perror_plus("clock_gettime");

1366

return -1;

1367

}

1368

mc.current_server = mc.current_server->next;

1369

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

1370

servers, but don't block */

1371

}

1372

1373

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

1374

}

1375

if(ret != 0){

1376

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

1377

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

1378

}

1379

}

1380

}

1381

}

1382

1383

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

1384

const float delay){

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1390

if(numhooks == -1){

1391

perror_plus("scandir");

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1399

perror_plus("asprintf");

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1444

free(delaystring);

1445

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

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

1484

}

1485

895

1486

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

896

1487

AvahiSServiceBrowser *sb = NULL;

897

1488

int error;

899

1490

intmax_t tmpmax;

900

1491

char *tmp;

901

1492

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1493

const char *interface = "";

903

1494

struct ifreq network;

904

int sd;

1495

int sd = -1;

1496

bool take_down_interface = false;

905

1497

uid_t uid;

906

1498

gid_t gid;

907

char *connect_to = NULL;

908

1499

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

909

1500

bool tempdir_created = false;

910

1501

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1505

bool gnutls_initialized = false;

915

1506

bool gpgme_initialized = false;

916

1507

float delay = 2.5f;

1508

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

1509

retrying the same server again */

917

1510

918

struct sigaction old_sigterm_action;

1511

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1512

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1513

1514

uid = getuid();

1515

gid = getgid();

1516

1517

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

1518

errno = 0;

1519

ret = setgid(gid);

1520

if(ret == -1){

1521

perror_plus("setgid");

1522

}

1523

1524

/* Lower user privileges (temporarily) */

1525

errno = 0;

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror_plus("seteuid");

1529

}

1530

1531

if(quit_now){

1532

goto end;

1533

}

1534

921

1535

{

922

1536

struct argp_option options[] = {

923

1537

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

952

1566

.arg = "SECONDS",

953

1567

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

954

1568

.group = 2 },

1569

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

1570

.arg = "SECONDS",

1571

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

1572

.group = 2 },

1573

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

1574

.arg = "DIR",

1575

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

1576

.group = 2 },

1577

/*

1578

* These reproduce what we would get without ARGP_NO_HELP

1579

*/

1580

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

1581

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

1582

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

1583

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

1584

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

1585

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

955

1586

{ .name = NULL }

956

1587

};

957

1588

958

1589

error_t parse_opt(int key, char *arg,

959

1590

struct argp_state *state){

1591

errno = 0;

960

1592

switch(key){

961

1593

case 128: /* --debug */

962

1594

debug = true;

978

1610

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

979

1611

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

980

1612

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

981

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

982

exit(EXIT_FAILURE);

1613

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

983

1614

}

984

1615

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

985

1616

break;

990

1621

errno = 0;

991

1622

delay = strtof(arg, &tmp);

992

1623

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

993

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

994

exit(EXIT_FAILURE);

995

}

996

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1624

argp_error(state, "Bad delay");

1625

}

1626

case 132: /* --retry */

1627

errno = 0;

1628

retry_interval = strtod(arg, &tmp);

1629

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

1630

or (retry_interval * 1000) > INT_MAX

1631

or retry_interval < 0){

1632

argp_error(state, "Bad retry interval");

1633

}

1634

break;

1635

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

1636

hookdir = arg;

1637

break;

1638

/*

1639

* These reproduce what we would get without ARGP_NO_HELP

1640

*/

1641

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

1642

argp_state_help(state, state->out_stream,

1643

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1644

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1645

case -3: /* --usage */

1646

argp_state_help(state, state->out_stream,

1647

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

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

1652

exit(argp_err_exit_status);

1000

1653

break;

1001

1654

default:

1002

1655

return ARGP_ERR_UNKNOWN;

1003

1656

}

1004

return 0;

1657

return errno;

1005

1658

}

1006

1659

1007

1660

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

1008

1661

.args_doc = "",

1009

1662

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

1010

1663

" 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;

1664

ret = argp_parse(&argp, argc, argv,

1665

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1666

switch(ret){

1667

case 0:

1668

break;

1669

case ENOMEM:

1670

default:

1671

errno = ret;

1672

perror_plus("argp_parse");

1673

exitcode = EX_OSERR;

1674

goto end;

1675

case EINVAL:

1676

exitcode = EX_USAGE;

1677

goto end;

1678

}

1679

}

1680

1681

if(getuid() == 0){

1682

/* Work around Debian bug #633582:

1683

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

1684

struct stat st;

1685

1686

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

1740

}

1741

}

1742

1743

/* Run network hooks */

1744

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

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

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1016

1763

}

1017

1764

}

1018

1765

1020

1767

avahi_set_log_function(empty_log);

1021

1768

}

1022

1769

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

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

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

1023

1802

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

1024

1803

from the signal handler */

1025

1804

/* Initialize the pseudo-RNG for Avahi */

1026

1805

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

1027

1806

mc.simple_poll = avahi_simple_poll_new();

1028

1807

if(mc.simple_poll == NULL){

1029

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

1030

exitcode = EXIT_FAILURE;

1808

fprintf_plus(stderr,

1809

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

1810

exitcode = EX_UNAVAILABLE;

1031

1811

goto end;

1032

1812

}

1033

1813

1034

1814

sigemptyset(&sigterm_action.sa_mask);

1035

1815

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

1036

1816

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1817

perror_plus("sigaddset");

1818

exitcode = EX_OSERR;

1039

1819

goto end;

1040

1820

}

1041

1821

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

1042

1822

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1823

perror_plus("sigaddset");

1824

exitcode = EX_OSERR;

1045

1825

goto end;

1046

1826

}

1047

1827

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

1048

1828

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

}

1829

perror_plus("sigaddset");

1830

exitcode = EX_OSERR;

1831

goto end;

1832

}

1833

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

1834

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

1835

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

1836

*/

1837

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

1838

if(ret == -1){

1839

perror_plus("sigaction");

1840

return EX_OSERR;

1841

}

1842

if(old_sigterm_action.sa_handler != SIG_IGN){

1843

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

1844

if(ret == -1){

1845

perror_plus("sigaction");

1846

exitcode = EX_OSERR;

1847

goto end;

1848

}

1849

}

1850

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

1851

if(ret == -1){

1852

perror_plus("sigaction");

1853

return EX_OSERR;

1854

}

1855

if(old_sigterm_action.sa_handler != SIG_IGN){

1856

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

1857

if(ret == -1){

1858

perror_plus("sigaction");

1859

exitcode = EX_OSERR;

1860

goto end;

1861

}

1862

}

1863

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

1864

if(ret == -1){

1865

perror_plus("sigaction");

1866

return EX_OSERR;

1867

}

1868

if(old_sigterm_action.sa_handler != SIG_IGN){

1869

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

1870

if(ret == -1){

1871

perror_plus("sigaction");

1872

exitcode = EX_OSERR;

1873

goto end;

1874

}

1875

}

1059

1876

1060

1877

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

1061

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

1878

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

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

if(if_index == 0){

1881

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

1882

exitcode = EX_UNAVAILABLE;

1883

goto end;

1884

}

1885

1886

if(quit_now){

1887

goto end;

1888

}

1889

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1062

1897

#ifdef __linux__

1063

1898

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1899

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

1065

1900

ret = klogctl(8, NULL, 5);

1066

1901

bool restore_loglevel = true;

1067

1902

if(ret == -1){

1068

1903

restore_loglevel = false;

1069

perror("klogctl");

1904

perror_plus("klogctl");

1070

1905

}

1071

1906

#endif /* __linux__ */

1072

1907

1073

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1909

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1077

1912

#ifdef __linux__

1078

1913

if(restore_loglevel){

1079

1914

ret = klogctl(7, NULL, 0);

1080

1915

if(ret == -1){

1081

perror("klogctl");

1916

perror_plus("klogctl");

1082

1917

}

1083

1918

}

1084

1919

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1085

1926

goto end;

1086

1927

}

1087

1928

strcpy(network.ifr_name, interface);

1088

1929

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

1089

1930

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1931

perror_plus("ioctl SIOCGIFFLAGS");

1091

1932

#ifdef __linux__

1092

1933

if(restore_loglevel){

1093

1934

ret = klogctl(7, NULL, 0);

1094

1935

if(ret == -1){

1095

perror("klogctl");

1936

perror_plus("klogctl");

1096

1937

}

1097

1938

}

1098

1939

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1100

1947

goto end;

1101

1948

}

1102

1949

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

1103

1950

network.ifr_flags |= IFF_UP;

1951

take_down_interface = true;

1104

1952

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

1105

1953

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1954

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1108

1957

#ifdef __linux__

1109

1958

if(restore_loglevel){

1110

1959

ret = klogctl(7, NULL, 0);

1111

1960

if(ret == -1){

1112

perror("klogctl");

1961

perror_plus("klogctl");

1113

1962

}

1114

1963

}

1115

1964

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1116

1971

goto end;

1117

1972

}

1118

1973

}

1119

/* sleep checking until interface is running */

1974

/* Sleep checking until interface is running.

1975

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

1120

1976

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

1121

1977

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

1122

1978

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1979

perror_plus("ioctl SIOCGIFFLAGS");

1124

1980

} else if(network.ifr_flags & IFF_RUNNING){

1125

1981

break;

1126

1982

}

1127

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1984

ret = nanosleep(&sleeptime, NULL);

1129

1985

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

1130

perror("nanosleep");

1986

perror_plus("nanosleep");

1131

1987

}

1132

1988

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1989

if(not take_down_interface){

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("close");

1994

}

1136

1995

}

1137

1996

#ifdef __linux__

1138

1997

if(restore_loglevel){

1139

1998

/* Restores kernel loglevel to default */

1140

1999

ret = klogctl(7, NULL, 0);

1141

2000

if(ret == -1){

1142

perror("klogctl");

2001

perror_plus("klogctl");

1143

2002

}

1144

2003

}

1145

2004

#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");

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2012

}

2013

2014

if(quit_now){

2015

goto end;

1160

2016

}

1161

2017

1162

2018

ret = init_gnutls_global(pubkey, seckey);

1163

2019

if(ret == -1){

1164

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

1165

exitcode = EXIT_FAILURE;

2020

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

2021

exitcode = EX_UNAVAILABLE;

1166

2022

goto end;

1167

2023

} else {

1168

2024

gnutls_initialized = true;

1169

2025

}

1170

2026

2027

if(quit_now){

2028

goto end;

2029

}

2030

1171

2031

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

2032

perror_plus("mkdtemp");

1173

2033

goto end;

1174

2034

}

1175

2035

tempdir_created = true;

1176

2036

2037

if(quit_now){

2038

goto end;

2039

}

2040

1177

2041

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

1178

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

1179

exitcode = EXIT_FAILURE;

2042

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

2043

exitcode = EX_UNAVAILABLE;

1180

2044

goto end;

1181

2045

} else {

1182

2046

gpgme_initialized = true;

1183

2047

}

1184

2048

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

}

2049

if(quit_now){

2050

goto end;

1192

2051

}

1193

2052

1194

2053

if(connect_to != NULL){

1196

2055

/* (Mainly meant for debugging) */

1197

2056

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

1198

2057

if(address == NULL){

1199

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

2058

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

2059

exitcode = EX_USAGE;

2060

goto end;

2061

}

2062

2063

if(quit_now){

2064

goto end;

2065

}

2066

1203

2067

uint16_t port;

1204

2068

errno = 0;

1205

2069

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

1206

2070

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

1207

2071

or tmpmax != (uint16_t)tmpmax){

1208

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2072

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

2073

exitcode = EX_USAGE;

2074

goto end;

2075

}

2076

2077

if(quit_now){

2078

goto end;

2079

}

2080

1212

2081

port = (uint16_t)tmpmax;

1213

2082

*address = '\0';

1214

address = connect_to;

1215

2083

/* Colon in address indicates IPv6 */

1216

2084

int af;

1217

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

2085

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

1218

2086

af = AF_INET6;

2087

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

2088

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

2089

{

2090

connect_to++;

2091

address[-1] = '\0';

2092

}

1219

2093

} else {

1220

2094

af = AF_INET;

1221

2095

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2096

address = connect_to;

2097

2098

if(quit_now){

2099

goto end;

2100

}

2101

2102

while(not quit_now){

2103

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

2104

if(quit_now or ret == 0){

2105

break;

2106

}

2107

if(debug){

2108

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

2109

(int)retry_interval);

2110

}

2111

sleep((int)retry_interval);

2112

}

2113

2114

if (not quit_now){

1226

2115

exitcode = EXIT_SUCCESS;

1227

2116

}

1228

goto end;

1229

}

1230

2117

2118

goto end;

2119

}

2120

2121

if(quit_now){

2122

goto end;

2123

}

2124

1231

2125

{

1232

2126

AvahiServerConfig config;

1233

2127

/* Do not publish any local Zeroconf records */

1248

2142

1249

2143

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

1250

2144

if(mc.server == NULL){

1251

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

1252

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2145

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

2146

avahi_strerror(error));

2147

exitcode = EX_UNAVAILABLE;

2148

goto end;

2149

}

2150

2151

if(quit_now){

1254

2152

goto end;

1255

2153

}

1256

2154

1259

2157

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

2158

NULL, 0, browse_callback, NULL);

1261

2159

if(sb == NULL){

1262

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

1263

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2160

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

2161

avahi_strerror(avahi_server_errno(mc.server)));

2162

exitcode = EX_UNAVAILABLE;

2163

goto end;

2164

}

2165

2166

if(quit_now){

1265

2167

goto end;

1266

2168

}

1267

2169

1268

2170

/* Run the main loop */

1269

2171

1270

2172

if(debug){

1271

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

1272

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2173

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

2174

}

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2178

if(debug){

2179

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

2180

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

2181

}

1275

2182

1276

2183

end:

1277

2184

1278

2185

if(debug){

1279

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

2186

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

1280

2187

}

1281

2188

1282

2189

/* Cleanup things */

1299

2206

gpgme_release(mc.ctx);

1300

2207

}

1301

2208

1302

/* Removes the temp directory used by GPGME */

2209

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

2210

has seen */

2211

if(mc.current_server != NULL){

2212

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

2213

while(mc.current_server != NULL){

2214

server *next = mc.current_server->next;

2215

free(mc.current_server);

2216

mc.current_server = next;

2217

}

2218

}

2219

2220

/* Re-raise priviliges */

2221

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

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

2235

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

2236

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2243

}

2244

}

2245

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

2246

if(ret == -1){

2247

perror_plus("close");

2248

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

2257

}

2258

}

2259

2260

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

1303

2261

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

}

2262

struct dirent **direntries = NULL;

2263

struct dirent *direntry = NULL;

2264

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

2265

alphasort);

2266

if (numentries > 0){

2267

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

2268

direntry = direntries[i];

1324

2269

char *fullname = NULL;

1325

2270

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

1326

2271

direntry->d_name);

1327

2272

if(ret < 0){

1328

perror("asprintf");

2273

perror_plus("asprintf");

1329

2274

continue;

1330

2275

}

1331

2276

ret = remove(fullname);

1332

2277

if(ret == -1){

1333

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

1334

strerror(errno));

2278

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

2279

strerror(errno));

1335

2280

}

1336

2281

free(fullname);

1337

2282

}

1338

closedir(d);

2283

}

2284

2285

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

2286

free(direntries);

2287

if (numentries == -1){

2288

perror_plus("scandir");

1339

2289

}

1340

2290

ret = rmdir(tempdir);

1341

2291

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

1342

perror("rmdir");

1343

}

2292

perror_plus("rmdir");

2293

}

2294

}

2295

2296

if(quit_now){

2297

sigemptyset(&old_sigterm_action.sa_mask);

2298

old_sigterm_action.sa_handler = SIG_DFL;

2299

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2300

&old_sigterm_action,

2301

NULL));

2302

if(ret == -1){

2303

perror_plus("sigaction");

2304

}

2305

do {

2306

ret = raise(signal_received);

2307

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

2308

if(ret != 0){

2309

perror_plus("raise");

2310

abort();

2311

}

2312

TEMP_FAILURE_RETRY(pause());

1344

2313

}

1345

2314

1346

2315

return exitcode;