/mandos/release : revision 237.16.10

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

393

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

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");

319

401

recipient = recipient->next;

320

402

}

321

403

}

324

406

}

325

407

326

408

if(debug){

327

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

409

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

328

410

}

329

411

330

412

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

331

413

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

332

perror("gpgme_data_seek");

414

perror_plus("gpgme_data_seek");

333

415

plaintext_length = -1;

334

416

goto decrypt_end;

335

417

}

337

419

*plaintext = NULL;

338

420

while(true){

339

421

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

342

424

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

346

428

}

347

429

348

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

435

break;

354

436

}

355

437

if(ret < 0){

356

perror("gpgme_data_read");

438

perror_plus("gpgme_data_read");

357

439

plaintext_length = -1;

358

440

goto decrypt_end;

359

441

}

361

443

}

362

444

363

445

if(debug){

364

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

446

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

365

447

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

366

448

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

367

449

}

389

471

/* GnuTLS log function callback */

390

472

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

391

473

const char* string){

392

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

474

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

393

475

}

394

476

395

477

static int init_gnutls_global(const char *pubkeyfilename,

397

479

int ret;

398

480

399

481

if(debug){

400

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

482

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

401

483

}

402

484

403

485

ret = gnutls_global_init();

404

486

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

407

489

return -1;

408

490

}

409

491

416

498

}

417

499

418

500

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

502

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

426

505

gnutls_global_deinit();

427

506

return -1;

428

507

}

429

508

430

509

if(debug){

431

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

432

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

433

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);

434

514

}

435

515

436

516

ret = gnutls_certificate_set_openpgp_key_file

437

517

(mc.cred, pubkeyfilename, seckeyfilename,

438

518

GNUTLS_OPENPGP_FMT_BASE64);

439

519

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

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));

445

525

goto globalfail;

446

526

}

447

527

448

528

/* GnuTLS server initialization */

449

529

ret = gnutls_dh_params_init(&mc.dh_params);

450

530

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

453

534

goto globalfail;

454

535

}

455

536

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

456

537

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

459

540

goto globalfail;

460

541

}

461

542

474

555

static int init_gnutls_session(gnutls_session_t *session){

475

556

int ret;

476

557

/* GnuTLS session creation */

477

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);

478

564

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

481

568

}

482

569

483

570

{

484

571

const char *err;

485

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);

486

579

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

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));

490

583

gnutls_deinit(*session);

491

584

return -1;

492

585

}

493

586

}

494

587

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

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);

497

596

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

500

599

gnutls_deinit(*session);

501

600

return -1;

502

601

}

503

602

504

603

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

605

508

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

607

518

616

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

519

617

AvahiIfIndex if_index,

520

618

int af){

521

int ret, tcp_sd;

619

int ret, tcp_sd = -1;

522

620

ssize_t sret;

523

621

union {

524

622

struct sockaddr_in in;

525

623

struct sockaddr_in6 in6;

526

624

} to;

527

625

char *buffer = NULL;

528

char *decrypted_buffer;

626

char *decrypted_buffer = NULL;

529

627

size_t buffer_length = 0;

530

628

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

629

size_t written;

533

int retval = 0;

630

int retval = -1;

534

631

gnutls_session_t session;

535

632

int pf; /* Protocol family */

536

633

634

errno = 0;

635

636

if(quit_now){

637

errno = EINTR;

638

return -1;

639

}

640

537

641

switch(af){

538

642

case AF_INET6:

539

643

pf = PF_INET6;

542

646

pf = PF_INET;

543

647

break;

544

648

default:

545

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

649

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

650

errno = EINVAL;

546

651

return -1;

547

652

}

548

653

552

657

}

553

658

554

659

if(debug){

555

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

556

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

557

662

}

558

663

559

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

665

if(tcp_sd < 0){

561

perror("socket");

562

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;

563

675

}

564

676

565

677

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

571

683

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

572

684

}

573

685

if(ret < 0 ){

574

perror("inet_pton");

575

return -1;

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

689

goto mandos_end;

576

690

}

577

691

if(ret == 0){

578

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

579

return -1;

692

int e = errno;

693

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

694

errno = e;

695

goto mandos_end;

580

696

}

581

697

if(af == AF_INET6){

582

698

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

585

701

586

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

587

703

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

588

-Wunreachable-code*/

704

-Wunreachable-code*/

589

705

if(if_index == AVAHI_IF_UNSPEC){

590

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

591

" without a network interface\n");

592

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;

593

710

}

594

711

/* Set the network interface number as scope */

595

712

to.in6.sin6_scope_id = (uint32_t)if_index;

600

717

-Wunreachable-code */

601

718

}

602

719

720

if(quit_now){

721

errno = EINTR;

722

goto mandos_end;

723

}

724

603

725

if(debug){

604

726

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

605

727

char interface[IF_NAMESIZE];

606

728

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

607

perror("if_indextoname");

729

perror_plus("if_indextoname");

608

730

} else {

609

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

610

ip, interface, port);

731

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

732

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

611

733

}

612

734

} else {

613

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

614

port);

735

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

736

ip, port);

615

737

}

616

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

617

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

624

746

sizeof(addrstr));

625

747

}

626

748

if(pcret == NULL){

627

perror("inet_ntop");

749

perror_plus("inet_ntop");

628

750

} else {

629

751

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

630

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

752

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

631

753

}

632

754

}

633

755

}

634

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

635

762

if(af == AF_INET6){

636

763

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

637

764

} else {

638

765

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

639

766

}

640

767

if(ret < 0){

641

perror("connect");

642

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;

643

779

}

644

780

645

781

const char *out = mandos_protocol_version;

647

783

while(true){

648

784

size_t out_size = strlen(out);

649

785

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

650

out_size - written));

786

out_size - written));

651

787

if(ret == -1){

652

perror("write");

653

retval = -1;

788

int e = errno;

789

perror_plus("write");

790

errno = e;

654

791

goto mandos_end;

655

792

}

656

793

written += (size_t)ret;

664

801

break;

665

802

}

666

803

}

804

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

667

809

}

668

810

669

811

if(debug){

670

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

671

}

672

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 */

673

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

822

675

do{

823

if(quit_now){

824

errno = EINTR;

825

goto mandos_end;

826

}

827

828

do {

676

829

ret = gnutls_handshake(session);

830

if(quit_now){

831

errno = EINTR;

832

goto mandos_end;

833

}

677

834

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

678

835

679

836

if(ret != GNUTLS_E_SUCCESS){

680

837

if(debug){

681

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

838

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

682

839

gnutls_perror(ret);

683

840

}

684

retval = -1;

841

errno = EPROTO;

685

842

goto mandos_end;

686

843

}

687

844

688

845

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

689

846

690

847

if(debug){

691

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

692

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

693

850

}

694

851

695

852

while(true){

853

854

if(quit_now){

855

errno = EINTR;

856

goto mandos_end;

857

}

858

696

859

buffer_capacity = incbuffer(&buffer, buffer_length,

697

buffer_capacity);

860

buffer_capacity);

698

861

if(buffer_capacity == 0){

699

perror("incbuffer");

700

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;

701

870

goto mandos_end;

702

871

}

703

872

712

881

case GNUTLS_E_AGAIN:

713

882

break;

714

883

case GNUTLS_E_REHANDSHAKE:

715

do{

884

do {

716

885

ret = gnutls_handshake(session);

886

887

if(quit_now){

888

errno = EINTR;

889

goto mandos_end;

890

}

717

891

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

718

892

if(ret < 0){

719

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

893

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

894

"***\n");

720

895

gnutls_perror(ret);

721

retval = -1;

896

errno = EPROTO;

722

897

goto mandos_end;

723

898

}

724

899

break;

725

900

default:

726

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

727

" encrypted session with Mandos server\n");

728

retval = -1;

901

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

902

" encrypted session with Mandos server\n");

729

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

730

905

goto mandos_end;

731

906

}

732

907

} else {

735

910

}

736

911

737

912

if(debug){

738

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

739

}

740

741

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);

742

928

743

929

if(buffer_length > 0){

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

buffer_length,

930

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

746

932

&decrypted_buffer);

747

933

if(decrypted_buffer_size >= 0){

934

748

935

written = 0;

749

936

while(written < (size_t) decrypted_buffer_size){

937

if(quit_now){

938

errno = EINTR;

939

goto mandos_end;

940

}

941

750

942

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

751

943

(size_t)decrypted_buffer_size - written,

752

944

stdout);

753

945

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

946

int e = errno;

754

947

if(debug){

755

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

756

strerror(errno));

948

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

949

strerror(errno));

757

950

}

758

retval = -1;

759

break;

951

errno = e;

952

goto mandos_end;

760

953

}

761

954

written += (size_t)ret;

762

955

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

956

retval = 0;

766

957

}

767

} else {

768

retval = -1;

769

958

}

770

959

771

960

/* Shutdown procedure */

772

961

773

962

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

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

}

778

982

}

779

gnutls_deinit(session);

780

983

return retval;

781

984

}

782

985

799

1002

/* Called whenever a service has been resolved successfully or

800

1003

timed out */

801

1004

1005

if(quit_now){

1006

return;

1007

}

1008

802

1009

switch(event){

803

1010

default:

804

1011

case AVAHI_RESOLVER_FAILURE:

805

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

806

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

807

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)));

808

1016

break;

809

1017

810

1018

case AVAHI_RESOLVER_FOUND:

812

1020

char ip[AVAHI_ADDRESS_STR_MAX];

813

1021

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

814

1022

if(debug){

815

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

816

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

817

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);

818

1026

}

819

1027

int ret = start_mandos_communication(ip, port, interface,

820

1028

avahi_proto_to_af(proto));

821

1029

if(ret == 0){

822

1030

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

823

1034

}

824

1035

}

825

1036

}

841

1052

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

842

1053

is removed from the LAN */

843

1054

1055

if(quit_now){

1056

return;

1057

}

1058

844

1059

switch(event){

845

1060

default:

846

1061

case AVAHI_BROWSER_FAILURE:

847

1062

848

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

849

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

850

1065

avahi_simple_poll_quit(mc.simple_poll);

851

1066

return;

852

1067

859

1074

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

860

1075

name, type, domain, protocol, 0,

861

1076

resolve_callback, NULL) == NULL)

862

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

863

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)));

864

1080

break;

865

1081

866

1082

case AVAHI_BROWSER_REMOVE:

869

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

870

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

871

1087

if(debug){

872

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

1088

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

1089

" searching...\n");

873

1090

}

874

1091

break;

875

1092

}

876

1093

}

877

1094

878

sig_atomic_t quit_now = 0;

879

880

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

881

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

1095

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

1096

static void handle_sigterm(int sig){

882

1097

if(quit_now){

883

1098

return;

884

1099

}

885

1100

quit_now = 1;

1101

signal_received = sig;

886

1102

int old_errno = errno;

1103

/* set main loop to exit */

887

1104

if(mc.simple_poll != NULL){

888

1105

avahi_simple_poll_quit(mc.simple_poll);

889

1106

}

890

1107

errno = old_errno;

891

1108

}

892

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

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1436

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1475

}

1476

893

1477

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

894

1478

AvahiSServiceBrowser *sb = NULL;

895

1479

int error;

897

1481

intmax_t tmpmax;

898

1482

char *tmp;

899

1483

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1484

const char *interface = "";

901

1485

struct ifreq network;

902

1486

int sd = -1;

903

bool interface_taken_up = false;

1487

bool take_down_interface = false;

904

1488

uid_t uid;

905

1489

gid_t gid;

906

char *connect_to = NULL;

907

1490

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

908

1491

bool tempdir_created = false;

909

1492

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

913

1496

bool gnutls_initialized = false;

914

1497

bool gpgme_initialized = false;

915

1498

float delay = 2.5f;

1499

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

1500

retrying the same server again */

916

1501

917

struct sigaction old_sigterm_action;

1502

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

1503

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

919

1504

1505

uid = getuid();

1506

gid = getgid();

1507

1508

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

1509

errno = 0;

1510

ret = setgid(gid);

1511

if(ret == -1){

1512

perror_plus("setgid");

1513

}

1514

1515

/* Lower user privileges (temporarily) */

1516

errno = 0;

1517

ret = seteuid(uid);

1518

if(ret == -1){

1519

perror_plus("seteuid");

1520

}

1521

1522

if(quit_now){

1523

goto end;

1524

}

1525

920

1526

{

921

1527

struct argp_option options[] = {

922

1528

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

951

1557

.arg = "SECONDS",

952

1558

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

953

1559

.group = 2 },

1560

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

1561

.arg = "SECONDS",

1562

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

1563

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1568

/*

1569

* These reproduce what we would get without ARGP_NO_HELP

1570

*/

1571

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

1572

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

1573

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

1574

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

1575

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

1576

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

954

1577

{ .name = NULL }

955

1578

};

956

1579

957

1580

error_t parse_opt(int key, char *arg,

958

1581

struct argp_state *state){

1582

errno = 0;

959

1583

switch(key){

960

1584

case 128: /* --debug */

961

1585

debug = true;

977

1601

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

978

1602

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

979

1603

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

980

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

981

exit(EXIT_FAILURE);

1604

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

982

1605

}

983

1606

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

984

1607

break;

989

1612

errno = 0;

990

1613

delay = strtof(arg, &tmp);

991

1614

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

992

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

993

exit(EXIT_FAILURE);

994

}

995

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1615

argp_error(state, "Bad delay");

1616

}

1617

case 132: /* --retry */

1618

errno = 0;

1619

retry_interval = strtod(arg, &tmp);

1620

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

1621

or (retry_interval * 1000) > INT_MAX

1622

or retry_interval < 0){

1623

argp_error(state, "Bad retry interval");

1624

}

1625

break;

1626

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

1627

hookdir = arg;

1628

break;

1629

/*

1630

* These reproduce what we would get without ARGP_NO_HELP

1631

*/

1632

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

1633

argp_state_help(state, state->out_stream,

1634

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1635

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1636

case -3: /* --usage */

1637

argp_state_help(state, state->out_stream,

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1643

exit(argp_err_exit_status);

999

1644

break;

1000

1645

default:

1001

1646

return ARGP_ERR_UNKNOWN;

1002

1647

}

1003

return 0;

1648

return errno;

1004

1649

}

1005

1650

1006

1651

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

1007

1652

.args_doc = "",

1008

1653

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

1009

1654

" passwords from a Mandos server" };

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

1014

goto end;

1655

ret = argp_parse(&argp, argc, argv,

1656

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1657

switch(ret){

1658

case 0:

1659

break;

1660

case ENOMEM:

1661

default:

1662

errno = ret;

1663

perror_plus("argp_parse");

1664

exitcode = EX_OSERR;

1665

goto end;

1666

case EINVAL:

1667

exitcode = EX_USAGE;

1668

goto end;

1669

}

1670

}

1671

1672

{

1673

/* Work around Debian bug #633582:

1674

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

}

1732

}

1733

1734

/* Run network hooks */

1735

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1015

1750

}

1016

1751

}

1017

1752

1019

1754

avahi_set_log_function(empty_log);

1020

1755

}

1021

1756

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

1022

1789

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

1023

1790

from the signal handler */

1024

1791

/* Initialize the pseudo-RNG for Avahi */

1025

1792

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

1026

1793

mc.simple_poll = avahi_simple_poll_new();

1027

1794

if(mc.simple_poll == NULL){

1028

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

1029

exitcode = EXIT_FAILURE;

1795

fprintf_plus(stderr,

1796

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

1797

exitcode = EX_UNAVAILABLE;

1030

1798

goto end;

1031

1799

}

1032

1800

1033

1801

sigemptyset(&sigterm_action.sa_mask);

1034

1802

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

1035

1803

if(ret == -1){

1036

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1804

perror_plus("sigaddset");

1805

exitcode = EX_OSERR;

1038

1806

goto end;

1039

1807

}

1040

1808

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

1041

1809

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1810

perror_plus("sigaddset");

1811

exitcode = EX_OSERR;

1044

1812

goto end;

1045

1813

}

1046

1814

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

1047

1815

if(ret == -1){

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1816

perror_plus("sigaddset");

1817

exitcode = EX_OSERR;

1818

goto end;

1819

}

1820

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

1821

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

1822

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

1823

*/

1824

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

1825

if(ret == -1){

1826

perror_plus("sigaction");

1827

return EX_OSERR;

1828

}

1829

if(old_sigterm_action.sa_handler != SIG_IGN){

1830

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

1831

if(ret == -1){

1832

perror_plus("sigaction");

1833

exitcode = EX_OSERR;

1834

goto end;

1835

}

1836

}

1837

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

1844

if(ret == -1){

1845

perror_plus("sigaction");

1846

exitcode = EX_OSERR;

1847

goto end;

1848

}

1849

}

1850

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

1857

if(ret == -1){

1858

perror_plus("sigaction");

1859

exitcode = EX_OSERR;

1860

goto end;

1861

}

1862

}

1058

1863

1059

1864

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

1060

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1061

1884

#ifdef __linux__

1062

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1886

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

1064

1887

ret = klogctl(8, NULL, 5);

1065

1888

bool restore_loglevel = true;

1066

1889

if(ret == -1){

1067

1890

restore_loglevel = false;

1068

perror("klogctl");

1891

perror_plus("klogctl");

1069

1892

}

1070

1893

#endif /* __linux__ */

1071

1894

1072

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

1896

if(sd < 0){

1074

perror("socket");

1075

exitcode = EXIT_FAILURE;

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1076

1899

#ifdef __linux__

1077

1900

if(restore_loglevel){

1078

1901

ret = klogctl(7, NULL, 0);

1079

1902

if(ret == -1){

1080

perror("klogctl");

1903

perror_plus("klogctl");

1081

1904

}

1082

1905

}

1083

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1084

1913

goto end;

1085

1914

}

1086

1915

strcpy(network.ifr_name, interface);

1087

1916

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

1088

1917

if(ret == -1){

1089

perror("ioctl SIOCGIFFLAGS");

1918

perror_plus("ioctl SIOCGIFFLAGS");

1090

1919

#ifdef __linux__

1091

1920

if(restore_loglevel){

1092

1921

ret = klogctl(7, NULL, 0);

1093

1922

if(ret == -1){

1094

perror("klogctl");

1923

perror_plus("klogctl");

1095

1924

}

1096

1925

}

1097

1926

#endif /* __linux__ */

1098

exitcode = EXIT_FAILURE;

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1099

1934

goto end;

1100

1935

}

1101

1936

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

1102

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1103

1939

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

1104

1940

if(ret == -1){

1105

perror("ioctl SIOCSIFFLAGS");

1106

exitcode = EXIT_FAILURE;

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1107

1944

#ifdef __linux__

1108

1945

if(restore_loglevel){

1109

1946

ret = klogctl(7, NULL, 0);

1110

1947

if(ret == -1){

1111

perror("klogctl");

1948

perror_plus("klogctl");

1112

1949

}

1113

1950

}

1114

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1115

1958

goto end;

1116

1959

}

1117

interface_taken_up = true;

1118

1960

}

1119

/* sleep checking until interface is running */

1961

/* Sleep checking until interface is running.

1962

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

1120

1963

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

1121

1964

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

1122

1965

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1966

perror_plus("ioctl SIOCGIFFLAGS");

1124

1967

} else if(network.ifr_flags & IFF_RUNNING){

1125

1968

break;

1126

1969

}

1127

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1971

ret = nanosleep(&sleeptime, NULL);

1129

1972

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

1130

perror("nanosleep");

1973

perror_plus("nanosleep");

1131

1974

}

1132

1975

}

1133

if(not interface_taken_up){

1976

if(not take_down_interface){

1977

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

1134

1978

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

1135

1979

if(ret == -1){

1136

perror("close");

1980

perror_plus("close");

1137

1981

}

1138

1982

}

1139

1983

#ifdef __linux__

1141

1985

/* Restores kernel loglevel to default */

1142

1986

ret = klogctl(7, NULL, 0);

1143

1987

if(ret == -1){

1144

perror("klogctl");

1988

perror_plus("klogctl");

1145

1989

}

1146

1990

}

1147

1991

#endif /* __linux__ */

1148

}

1149

1150

uid = getuid();

1151

gid = getgid();

1152

1153

errno = 0;

1154

setgid(gid);

1155

if(ret == -1){

1156

perror("setgid");

1157

}

1158

1159

ret = setuid(uid);

1160

if(ret == -1){

1161

perror("setuid");

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

1999

}

2000

2001

if(quit_now){

2002

goto end;

1162

2003

}

1163

2004

1164

2005

ret = init_gnutls_global(pubkey, seckey);

1165

2006

if(ret == -1){

1166

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

1167

exitcode = EXIT_FAILURE;

2007

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

2008

exitcode = EX_UNAVAILABLE;

1168

2009

goto end;

1169

2010

} else {

1170

2011

gnutls_initialized = true;

1171

2012

}

1172

2013

2014

if(quit_now){

2015

goto end;

2016

}

2017

1173

2018

if(mkdtemp(tempdir) == NULL){

1174

perror("mkdtemp");

2019

perror_plus("mkdtemp");

1175

2020

goto end;

1176

2021

}

1177

2022

tempdir_created = true;

1178

2023

2024

if(quit_now){

2025

goto end;

2026

}

2027

1179

2028

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

1180

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

1181

exitcode = EXIT_FAILURE;

2029

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

2030

exitcode = EX_UNAVAILABLE;

1182

2031

goto end;

1183

2032

} else {

1184

2033

gpgme_initialized = true;

1185

2034

}

1186

2035

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

2036

if(quit_now){

2037

goto end;

1194

2038

}

1195

2039

1196

2040

if(connect_to != NULL){

1198

2042

/* (Mainly meant for debugging) */

1199

2043

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

1200

2044

if(address == NULL){

1201

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

1202

exitcode = EXIT_FAILURE;

1203

goto end;

1204

}

2045

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

2046

exitcode = EX_USAGE;

2047

goto end;

2048

}

2049

2050

if(quit_now){

2051

goto end;

2052

}

2053

1205

2054

uint16_t port;

1206

2055

errno = 0;

1207

2056

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

1208

2057

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

1209

2058

or tmpmax != (uint16_t)tmpmax){

1210

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

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

2059

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

2060

exitcode = EX_USAGE;

2061

goto end;

2062

}

2063

2064

if(quit_now){

2065

goto end;

2066

}

2067

1214

2068

port = (uint16_t)tmpmax;

1215

2069

*address = '\0';

1216

address = connect_to;

1217

2070

/* Colon in address indicates IPv6 */

1218

2071

int af;

1219

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

2072

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

1220

2073

af = AF_INET6;

2074

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

2075

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

2076

{

2077

connect_to++;

2078

address[-1] = '\0';

2079

}

1221

2080

} else {

1222

2081

af = AF_INET;

1223

2082

}

1224

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

1225

if(ret < 0){

1226

exitcode = EXIT_FAILURE;

1227

} else {

2083

address = connect_to;

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

2089

while(not quit_now){

2090

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

2091

if(quit_now or ret == 0){

2092

break;

2093

}

2094

if(debug){

2095

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

2096

(int)retry_interval);

2097

}

2098

sleep((int)retry_interval);

2099

}

2100

2101

if (not quit_now){

1228

2102

exitcode = EXIT_SUCCESS;

1229

2103

}

1230

goto end;

1231

}

1232

2104

2105

goto end;

2106

}

2107

2108

if(quit_now){

2109

goto end;

2110

}

2111

1233

2112

{

1234

2113

AvahiServerConfig config;

1235

2114

/* Do not publish any local Zeroconf records */

1250

2129

1251

2130

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

1252

2131

if(mc.server == NULL){

1253

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

1254

avahi_strerror(error));

1255

exitcode = EXIT_FAILURE;

2132

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

2133

avahi_strerror(error));

2134

exitcode = EX_UNAVAILABLE;

2135

goto end;

2136

}

2137

2138

if(quit_now){

1256

2139

goto end;

1257

2140

}

1258

2141

1261

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1262

2145

NULL, 0, browse_callback, NULL);

1263

2146

if(sb == NULL){

1264

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

1265

avahi_strerror(avahi_server_errno(mc.server)));

1266

exitcode = EXIT_FAILURE;

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2149

exitcode = EX_UNAVAILABLE;

2150

goto end;

2151

}

2152

2153

if(quit_now){

1267

2154

goto end;

1268

2155

}

1269

2156

1270

2157

/* Run the main loop */

1271

2158

1272

2159

if(debug){

1273

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

1274

}

1275

1276

avahi_simple_poll_loop(mc.simple_poll);

2160

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

2161

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2165

if(debug){

2166

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

2167

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

2168

}

1277

2169

1278

2170

end:

1279

2171

1280

2172

if(debug){

1281

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

2173

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

1282

2174

}

1283

2175

1284

2176

/* Cleanup things */

1300

2192

if(gpgme_initialized){

1301

2193

gpgme_release(mc.ctx);

1302

2194

}

1303

1304

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1307

if(ret == -1){

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1315

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1319

}

1320

}

1321

1322

/* Removes the temp directory used by GPGME */

2195

2196

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

2197

has seen */

2198

if(mc.current_server != NULL){

2199

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

2200

while(mc.current_server != NULL){

2201

server *next = mc.current_server->next;

2202

free(mc.current_server);

2203

mc.current_server = next;

2204

}

2205

}

2206

2207

/* Re-raise priviliges */

2208

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2235

}

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

2244

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

1323

2245

if(tempdir_created){

1324

DIR *d;

1325

struct dirent *direntry;

1326

d = opendir(tempdir);

1327

if(d == NULL){

1328

if(errno != ENOENT){

1329

perror("opendir");

1330

}

1331

} else {

1332

while(true){

1333

direntry = readdir(d);

1334

if(direntry == NULL){

1335

break;

1336

}

1337

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

1338

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

1339

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

1340

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

1341

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

1342

continue;

1343

}

2246

struct dirent **direntries = NULL;

2247

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

2252

direntry = direntries[i];

1344

2253

char *fullname = NULL;

1345

2254

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

1346

2255

direntry->d_name);

1347

2256

if(ret < 0){

1348

perror("asprintf");

2257

perror_plus("asprintf");

1349

2258

continue;

1350

2259

}

1351

2260

ret = remove(fullname);

1352

2261

if(ret == -1){

1353

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

1354

strerror(errno));

2262

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

2263

strerror(errno));

1355

2264

}

1356

2265

free(fullname);

1357

2266

}

1358

closedir(d);

2267

}

2268

2269

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

2270

free(direntries);

2271

if (numentries == -1){

2272

perror_plus("scandir");

1359

2273

}

1360

2274

ret = rmdir(tempdir);

1361

2275

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

1362

perror("rmdir");

1363

}

2276

perror_plus("rmdir");

2277

}

2278

}

2279

2280

if(quit_now){

2281

sigemptyset(&old_sigterm_action.sa_mask);

2282

old_sigterm_action.sa_handler = SIG_DFL;

2283

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2284

&old_sigterm_action,

2285

NULL));

2286

if(ret == -1){

2287

perror_plus("sigaction");

2288

}

2289

do {

2290

ret = raise(signal_received);

2291

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

2292

if(ret != 0){

2293

perror_plus("raise");

2294

abort();

2295

}

2296

TEMP_FAILURE_RETRY(pause());

1364

2297

}

1365

2298

1366

2299

return exitcode;