/mandos/trunk : revision 530

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(), _exit() */

77

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

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

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() */

90

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

85

91

86

92

#ifdef __linux__

87

93

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

105

111

init_gnutls_session(),

106

112

GNUTLS_* */

107

113

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

110

116

111

117

/* GPGME */

112

118

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

120

126

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

121

127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

129

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

123

130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

127

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

134

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

135

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

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

143

AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

128

149

129

150

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

130

151

typedef struct {

135

156

gnutls_dh_params_t dh_params;

136

157

const char *priority;

137

158

gpgme_ctx_t ctx;

159

server *current_server;

138

160

} mandos_context;

139

161

140

162

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

141

163

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

142

164

.dh_bits = 1024, .priority = "SECURE256"

143

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

165

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

166

.current_server = NULL };

167

168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

144

186

145

187

/*

146

188

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

148

190

* "buffer_length" is how much is already used.

149

191

*/

150

192

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

193

size_t buffer_capacity){

152

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

195

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

154

196

if(buffer == NULL){

159

201

return buffer_capacity;

160

202

}

161

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

162

241

/*

163

242

* Initialize GPGME.

164

243

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

244

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

245

const char *tempdir){

168

246

gpgme_error_t rc;

169

247

gpgme_engine_info_t engine_info;

170

248

173

251

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

174

252

*/

175

253

bool import_key(const char *filename){

254

int ret;

176

255

int fd;

177

256

gpgme_data_t pgp_data;

178

257

179

258

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

180

259

if(fd == -1){

181

perror("open");

260

perror_plus("open");

182

261

return false;

183

262

}

184

263

185

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

265

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));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

189

268

return false;

190

269

}

191

270

192

271

rc = gpgme_op_import(mc.ctx, pgp_data);

193

272

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

196

275

return false;

197

276

}

198

277

199

278

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

200

279

if(ret == -1){

201

perror("close");

280

perror_plus("close");

202

281

}

203

282

gpgme_data_release(pgp_data);

204

283

return true;

205

284

}

206

285

207

286

if(debug){

208

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

287

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

209

288

}

210

289

211

290

/* Init GPGME */

212

291

gpgme_check_version(NULL);

213

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

293

if(rc != GPG_ERR_NO_ERROR){

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

217

296

return false;

218

297

}

219

298

220

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

299

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

221

300

rc = gpgme_get_engine_info(&engine_info);

222

301

if(rc != GPG_ERR_NO_ERROR){

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

225

304

return false;

226

305

}

227

306

while(engine_info != NULL){

233

312

engine_info = engine_info->next;

234

313

}

235

314

if(engine_info == NULL){

236

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

315

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

316

tempdir);

237

317

return false;

238

318

}

239

319

240

320

/* Create new GPGME "context" */

241

321

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

242

322

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

245

326

return false;

246

327

}

247

328

249

330

return false;

250

331

}

251

332

252

return true;

333

return true;

253

334

}

254

335

255

336

/*

266

347

ssize_t plaintext_length = 0;

267

348

268

349

if(debug){

269

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

350

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

270

351

}

271

352

272

353

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

273

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

355

0);

275

356

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));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

278

359

return -1;

279

360

}

280

361

281

362

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

282

363

rc = gpgme_data_new(&dh_plain);

283

364

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

286

368

gpgme_data_release(dh_crypto);

287

369

return -1;

288

370

}

291

373

data buffer */

292

374

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

293

375

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

296

378

plaintext_length = -1;

297

379

if(debug){

298

380

gpgme_decrypt_result_t result;

299

381

result = gpgme_op_decrypt_result(mc.ctx);

300

382

if(result == NULL){

301

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

383

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

302

384

} 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);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

307

389

if(result->file_name != NULL){

308

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

390

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

309

391

}

310

392

gpgme_recipient_t recipient;

311

393

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

}

394

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

402

recipient = recipient->next;

322

403

}

323

404

}

324

405

}

326

407

}

327

408

328

409

if(debug){

329

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

410

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

330

411

}

331

412

332

413

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

333

414

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

334

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

335

416

plaintext_length = -1;

336

417

goto decrypt_end;

337

418

}

339

420

*plaintext = NULL;

340

421

while(true){

341

422

plaintext_capacity = incbuffer(plaintext,

342

(size_t)plaintext_length,

343

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

344

425

if(plaintext_capacity == 0){

345

perror("incbuffer");

346

plaintext_length = -1;

347

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

348

429

}

349

430

350

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

355

436

break;

356

437

}

357

438

if(ret < 0){

358

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

359

440

plaintext_length = -1;

360

441

goto decrypt_end;

361

442

}

363

444

}

364

445

365

446

if(debug){

366

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

447

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

367

448

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

368

449

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

369

450

}

391

472

/* GnuTLS log function callback */

392

473

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

393

474

const char* string){

394

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

475

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

395

476

}

396

477

397

478

static int init_gnutls_global(const char *pubkeyfilename,

399

480

int ret;

400

481

401

482

if(debug){

402

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

483

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

403

484

}

404

485

405

486

ret = gnutls_global_init();

406

487

if(ret != GNUTLS_E_SUCCESS){

407

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

408

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

409

490

return -1;

410

491

}

411

492

418

499

}

419

500

420

501

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

503

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));

504

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

505

safer_gnutls_strerror(ret));

428

506

gnutls_global_deinit();

429

507

return -1;

430

508

}

431

509

432

510

if(debug){

433

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

434

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

435

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

436

515

}

437

516

438

517

ret = gnutls_certificate_set_openpgp_key_file

439

518

(mc.cred, pubkeyfilename, seckeyfilename,

440

519

GNUTLS_OPENPGP_FMT_BASE64);

441

520

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));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

447

526

goto globalfail;

448

527

}

449

528

450

529

/* GnuTLS server initialization */

451

530

ret = gnutls_dh_params_init(&mc.dh_params);

452

531

if(ret != GNUTLS_E_SUCCESS){

453

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

454

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

455

535

goto globalfail;

456

536

}

457

537

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

458

538

if(ret != GNUTLS_E_SUCCESS){

459

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

460

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

461

541

goto globalfail;

462

542

}

463

543

476

556

static int init_gnutls_session(gnutls_session_t *session){

477

557

int ret;

478

558

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

559

do {

560

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

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

480

565

if(ret != GNUTLS_E_SUCCESS){

481

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

482

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

483

569

}

484

570

485

571

{

486

572

const char *err;

487

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

573

do {

574

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

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

488

580

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));

581

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

582

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

583

safer_gnutls_strerror(ret));

492

584

gnutls_deinit(*session);

493

585

return -1;

494

586

}

495

587

}

496

588

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

589

do {

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

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

499

597

if(ret != GNUTLS_E_SUCCESS){

500

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

501

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

502

600

gnutls_deinit(*session);

503

601

return -1;

504

602

}

505

603

506

604

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

606

510

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

608

520

617

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

521

618

AvahiIfIndex if_index,

522

619

int af){

523

int ret, tcp_sd;

620

int ret, tcp_sd = -1;

524

621

ssize_t sret;

525

622

union {

526

623

struct sockaddr_in in;

527

624

struct sockaddr_in6 in6;

528

625

} to;

529

626

char *buffer = NULL;

530

char *decrypted_buffer;

627

char *decrypted_buffer = NULL;

531

628

size_t buffer_length = 0;

532

629

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

630

size_t written;

535

int retval = 0;

631

int retval = -1;

536

632

gnutls_session_t session;

537

633

int pf; /* Protocol family */

538

634

635

errno = 0;

636

637

if(quit_now){

638

errno = EINTR;

639

return -1;

640

}

641

539

642

switch(af){

540

643

case AF_INET6:

541

644

pf = PF_INET6;

544

647

pf = PF_INET;

545

648

break;

546

649

default:

547

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

650

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

651

errno = EINVAL;

548

652

return -1;

549

653

}

550

654

554

658

}

555

659

556

660

if(debug){

557

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

558

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

559

663

}

560

664

561

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

666

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

errno = EINTR;

675

goto mandos_end;

565

676

}

566

677

567

678

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

573

684

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

574

685

}

575

686

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

690

goto mandos_end;

578

691

}

579

692

if(ret == 0){

580

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

581

return -1;

693

int e = errno;

694

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

695

errno = e;

696

goto mandos_end;

582

697

}

583

698

if(af == AF_INET6){

584

699

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

587

702

588

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

589

704

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

590

-Wunreachable-code*/

705

-Wunreachable-code*/

591

706

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;

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

710

goto mandos_end;

595

711

}

596

712

/* Set the network interface number as scope */

597

713

to.in6.sin6_scope_id = (uint32_t)if_index;

602

718

-Wunreachable-code */

603

719

}

604

720

721

if(quit_now){

722

errno = EINTR;

723

goto mandos_end;

724

}

725

605

726

if(debug){

606

727

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

607

728

char interface[IF_NAMESIZE];

608

729

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

609

perror("if_indextoname");

730

perror_plus("if_indextoname");

610

731

} else {

611

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

612

ip, interface, port);

732

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

733

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

613

734

}

614

735

} else {

615

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

616

port);

736

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

737

ip, port);

617

738

}

618

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

626

747

sizeof(addrstr));

627

748

}

628

749

if(pcret == NULL){

629

perror("inet_ntop");

750

perror_plus("inet_ntop");

630

751

} else {

631

752

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

632

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

753

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

633

754

}

634

755

}

635

756

}

636

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

637

763

if(af == AF_INET6){

638

764

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

639

765

} else {

640

766

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

641

767

}

642

768

if(ret < 0){

643

perror("connect");

644

return -1;

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

645

780

}

646

781

647

782

const char *out = mandos_protocol_version;

649

784

while(true){

650

785

size_t out_size = strlen(out);

651

786

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

652

out_size - written));

787

out_size - written));

653

788

if(ret == -1){

654

perror("write");

655

retval = -1;

789

int e = errno;

790

perror_plus("write");

791

errno = e;

656

792

goto mandos_end;

657

793

}

658

794

written += (size_t)ret;

666

802

break;

667

803

}

668

804

}

805

806

if(quit_now){

807

errno = EINTR;

808

goto mandos_end;

809

}

669

810

}

670

811

671

812

if(debug){

672

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

673

}

674

813

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

814

}

815

816

if(quit_now){

817

errno = EINTR;

818

goto mandos_end;

819

}

820

821

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

675

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

823

677

do{

824

if(quit_now){

825

errno = EINTR;

826

goto mandos_end;

827

}

828

829

do {

678

830

ret = gnutls_handshake(session);

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

834

}

679

835

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

680

836

681

837

if(ret != GNUTLS_E_SUCCESS){

682

838

if(debug){

683

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

839

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

684

840

gnutls_perror(ret);

685

841

}

686

retval = -1;

842

errno = EPROTO;

687

843

goto mandos_end;

688

844

}

689

845

690

846

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

691

847

692

848

if(debug){

693

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

694

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

695

851

}

696

852

697

853

while(true){

854

855

if(quit_now){

856

errno = EINTR;

857

goto mandos_end;

858

}

859

698

860

buffer_capacity = incbuffer(&buffer, buffer_length,

699

buffer_capacity);

861

buffer_capacity);

700

862

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

866

goto mandos_end;

867

}

868

869

if(quit_now){

870

errno = EINTR;

703

871

goto mandos_end;

704

872

}

705

873

714

882

case GNUTLS_E_AGAIN:

715

883

break;

716

884

case GNUTLS_E_REHANDSHAKE:

717

do{

885

do {

718

886

ret = gnutls_handshake(session);

887

888

if(quit_now){

889

errno = EINTR;

890

goto mandos_end;

891

}

719

892

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

720

893

if(ret < 0){

721

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

894

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

895

"***\n");

722

896

gnutls_perror(ret);

723

retval = -1;

897

errno = EPROTO;

724

898

goto mandos_end;

725

899

}

726

900

break;

727

901

default:

728

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

729

" encrypted session with Mandos server\n");

730

retval = -1;

902

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

903

" encrypted session with Mandos server\n");

731

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

732

906

goto mandos_end;

733

907

}

734

908

} else {

737

911

}

738

912

739

913

if(debug){

740

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

741

}

742

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

914

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

915

}

916

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

do {

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

924

if(quit_now){

925

errno = EINTR;

926

goto mandos_end;

927

}

928

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

744

929

745

930

if(buffer_length > 0){

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

buffer_length,

931

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

748

933

&decrypted_buffer);

749

934

if(decrypted_buffer_size >= 0){

935

750

936

written = 0;

751

937

while(written < (size_t) decrypted_buffer_size){

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

752

943

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

753

944

(size_t)decrypted_buffer_size - written,

754

945

stdout);

755

946

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

947

int e = errno;

756

948

if(debug){

757

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

758

strerror(errno));

949

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

950

strerror(errno));

759

951

}

760

retval = -1;

761

break;

952

errno = e;

953

goto mandos_end;

762

954

}

763

955

written += (size_t)ret;

764

956

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

957

retval = 0;

768

958

}

769

} else {

770

retval = -1;

771

959

}

772

960

773

961

/* Shutdown procedure */

774

962

775

963

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

780

983

}

781

gnutls_deinit(session);

782

984

return retval;

783

985

}

784

986

801

1003

/* Called whenever a service has been resolved successfully or

802

1004

timed out */

803

1005

1006

if(quit_now){

1007

return;

1008

}

1009

804

1010

switch(event){

805

1011

default:

806

1012

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)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

810

1017

break;

811

1018

812

1019

case AVAHI_RESOLVER_FOUND:

814

1021

char ip[AVAHI_ADDRESS_STR_MAX];

815

1022

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

816

1023

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);

1024

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

1025

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

1026

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

820

1027

}

821

1028

int ret = start_mandos_communication(ip, port, interface,

822

1029

avahi_proto_to_af(proto));

823

1030

if(ret == 0){

824

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

825

1035

}

826

1036

}

827

1037

}

843

1053

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

844

1054

is removed from the LAN */

845

1055

1056

if(quit_now){

1057

return;

1058

}

1059

846

1060

switch(event){

847

1061

default:

848

1062

case AVAHI_BROWSER_FAILURE:

849

1063

850

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

851

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

852

1066

avahi_simple_poll_quit(mc.simple_poll);

853

1067

return;

854

1068

861

1075

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

862

1076

name, type, domain, protocol, 0,

863

1077

resolve_callback, NULL) == NULL)

864

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

865

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

866

1081

break;

867

1082

868

1083

case AVAHI_BROWSER_REMOVE:

871

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

872

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

873

1088

if(debug){

874

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

1089

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

1090

" searching...\n");

875

1091

}

876

1092

break;

877

1093

}

878

1094

}

879

1095

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){

1096

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

1097

static void handle_sigterm(int sig){

884

1098

if(quit_now){

885

1099

return;

886

1100

}

887

1101

quit_now = 1;

1102

signal_received = sig;

888

1103

int old_errno = errno;

1104

/* set main loop to exit */

889

1105

if(mc.simple_poll != NULL){

890

1106

avahi_simple_poll_quit(mc.simple_poll);

891

1107

}

892

1108

errno = old_errno;

893

1109

}

894

1110

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

895

1511

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

896

1512

AvahiSServiceBrowser *sb = NULL;

897

1513

int error;

899

1515

intmax_t tmpmax;

900

1516

char *tmp;

901

1517

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1518

const char *interface = "";

903

1519

struct ifreq network;

904

int sd;

1520

int sd = -1;

1521

bool take_down_interface = false;

905

1522

uid_t uid;

906

1523

gid_t gid;

907

char *connect_to = NULL;

908

1524

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

909

1525

bool tempdir_created = false;

910

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1530

bool gnutls_initialized = false;

915

1531

bool gpgme_initialized = false;

916

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

917

1535

918

struct sigaction old_sigterm_action;

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1538

1539

uid = getuid();

1540

gid = getgid();

1541

1542

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

1543

errno = 0;

1544

ret = setgid(gid);

1545

if(ret == -1){

1546

perror_plus("setgid");

1547

}

1548

1549

/* Lower user privileges (temporarily) */

1550

errno = 0;

1551

ret = seteuid(uid);

1552

if(ret == -1){

1553

perror_plus("seteuid");

1554

}

1555

1556

if(quit_now){

1557

goto end;

1558

}

1559

921

1560

{

922

1561

struct argp_option options[] = {

923

1562

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

952

1591

.arg = "SECONDS",

953

1592

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

954

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

955

1611

{ .name = NULL }

956

1612

};

957

1613

958

1614

error_t parse_opt(int key, char *arg,

959

1615

struct argp_state *state){

1616

errno = 0;

960

1617

switch(key){

961

1618

case 128: /* --debug */

962

1619

debug = true;

978

1635

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

979

1636

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

980

1637

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

981

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

982

exit(EXIT_FAILURE);

1638

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

983

1639

}

984

1640

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

985

1641

break;

990

1646

errno = 0;

991

1647

delay = strtof(arg, &tmp);

992

1648

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:

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

1000

1678

break;

1001

1679

default:

1002

1680

return ARGP_ERR_UNKNOWN;

1003

1681

}

1004

return 0;

1682

return errno;

1005

1683

}

1006

1684

1007

1685

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

1008

1686

.args_doc = "",

1009

1687

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

1010

1688

" 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;

1016

}

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1017

1772

}

1018

1773

1019

1774

if(not debug){

1020

1775

avahi_set_log_function(empty_log);

1021

1776

}

1022

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1023

1810

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

1024

1811

from the signal handler */

1025

1812

/* Initialize the pseudo-RNG for Avahi */

1026

1813

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

1027

1814

mc.simple_poll = avahi_simple_poll_new();

1028

1815

if(mc.simple_poll == NULL){

1029

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

1030

exitcode = EXIT_FAILURE;

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1031

1819

goto end;

1032

1820

}

1033

1821

1034

1822

sigemptyset(&sigterm_action.sa_mask);

1035

1823

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

1036

1824

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1039

1827

goto end;

1040

1828

}

1041

1829

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

1042

1830

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1045

1833

goto end;

1046

1834

}

1047

1835

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

1048

1836

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

}

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1839

goto end;

1840

}

1841

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

1842

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

1843

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

1844

*/

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1849

}

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

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

1852

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1855

goto end;

1856

}

1857

}

1858

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

1859

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1862

}

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

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

1865

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

}

1870

}

1871

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

1872

if(ret == -1){

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1875

}

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

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

1878

if(ret == -1){

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1881

goto end;

1882

}

1883

}

1059

1884

1060

1885

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

1061

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1062

1905

#ifdef __linux__

1063

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1907

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

1065

1908

ret = klogctl(8, NULL, 5);

1066

1909

bool restore_loglevel = true;

1067

1910

if(ret == -1){

1068

1911

restore_loglevel = false;

1069

perror("klogctl");

1912

perror_plus("klogctl");

1070

1913

}

1071

1914

#endif /* __linux__ */

1072

1915

1073

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1917

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1077

1920

#ifdef __linux__

1078

1921

if(restore_loglevel){

1079

1922

ret = klogctl(7, NULL, 0);

1080

1923

if(ret == -1){

1081

perror("klogctl");

1924

perror_plus("klogctl");

1082

1925

}

1083

1926

}

1084

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1085

1934

goto end;

1086

1935

}

1087

1936

strcpy(network.ifr_name, interface);

1088

1937

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

1089

1938

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1091

1940

#ifdef __linux__

1092

1941

if(restore_loglevel){

1093

1942

ret = klogctl(7, NULL, 0);

1094

1943

if(ret == -1){

1095

perror("klogctl");

1944

perror_plus("klogctl");

1096

1945

}

1097

1946

}

1098

1947

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1100

1955

goto end;

1101

1956

}

1102

1957

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

1103

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1104

1960

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

1105

1961

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1108

1965

#ifdef __linux__

1109

1966

if(restore_loglevel){

1110

1967

ret = klogctl(7, NULL, 0);

1111

1968

if(ret == -1){

1112

perror("klogctl");

1969

perror_plus("klogctl");

1113

1970

}

1114

1971

}

1115

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1116

1979

goto end;

1117

1980

}

1118

1981

}

1119

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1120

1984

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

1121

1985

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

1122

1986

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1124

1988

} else if(network.ifr_flags & IFF_RUNNING){

1125

1989

break;

1126

1990

}

1127

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1992

ret = nanosleep(&sleeptime, NULL);

1129

1993

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

1130

perror("nanosleep");

1994

perror_plus("nanosleep");

1131

1995

}

1132

1996

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

1136

2003

}

1137

2004

#ifdef __linux__

1138

2005

if(restore_loglevel){

1139

2006

/* Restores kernel loglevel to default */

1140

2007

ret = klogctl(7, NULL, 0);

1141

2008

if(ret == -1){

1142

perror("klogctl");

2009

perror_plus("klogctl");

1143

2010

}

1144

2011

}

1145

2012

#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");

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2020

}

2021

2022

if(quit_now){

2023

goto end;

1160

2024

}

1161

2025

1162

2026

ret = init_gnutls_global(pubkey, seckey);

1163

2027

if(ret == -1){

1164

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

1165

exitcode = EXIT_FAILURE;

2028

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

2029

exitcode = EX_UNAVAILABLE;

1166

2030

goto end;

1167

2031

} else {

1168

2032

gnutls_initialized = true;

1169

2033

}

1170

2034

2035

if(quit_now){

2036

goto end;

2037

}

2038

1171

2039

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

2040

perror_plus("mkdtemp");

1173

2041

goto end;

1174

2042

}

1175

2043

tempdir_created = true;

1176

2044

2045

if(quit_now){

2046

goto end;

2047

}

2048

1177

2049

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

1178

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

1179

exitcode = EXIT_FAILURE;

2050

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

2051

exitcode = EX_UNAVAILABLE;

1180

2052

goto end;

1181

2053

} else {

1182

2054

gpgme_initialized = true;

1183

2055

}

1184

2056

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

}

2057

if(quit_now){

2058

goto end;

1192

2059

}

1193

2060

1194

2061

if(connect_to != NULL){

1196

2063

/* (Mainly meant for debugging) */

1197

2064

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

1198

2065

if(address == NULL){

1199

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

2066

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

2067

exitcode = EX_USAGE;

2068

goto end;

2069

}

2070

2071

if(quit_now){

2072

goto end;

2073

}

2074

1203

2075

uint16_t port;

1204

2076

errno = 0;

1205

2077

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

1206

2078

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

1207

2079

or tmpmax != (uint16_t)tmpmax){

1208

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2080

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

2081

exitcode = EX_USAGE;

2082

goto end;

2083

}

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

1212

2089

port = (uint16_t)tmpmax;

1213

2090

*address = '\0';

1214

address = connect_to;

1215

2091

/* Colon in address indicates IPv6 */

1216

2092

int af;

1217

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

2093

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

1218

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1219

2101

} else {

1220

2102

af = AF_INET;

1221

2103

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2104

address = connect_to;

2105

2106

if(quit_now){

2107

goto end;

2108

}

2109

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1226

2123

exitcode = EXIT_SUCCESS;

1227

2124

}

1228

goto end;

1229

}

1230

2125

2126

goto end;

2127

}

2128

2129

if(quit_now){

2130

goto end;

2131

}

2132

1231

2133

{

1232

2134

AvahiServerConfig config;

1233

2135

/* Do not publish any local Zeroconf records */

1248

2150

1249

2151

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

1250

2152

if(mc.server == NULL){

1251

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

1252

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

2156

goto end;

2157

}

2158

2159

if(quit_now){

1254

2160

goto end;

1255

2161

}

1256

2162

1259

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

2166

NULL, 0, browse_callback, NULL);

1261

2167

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;

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

2171

goto end;

2172

}

2173

2174

if(quit_now){

1265

2175

goto end;

1266

2176

}

1267

2177

1268

2178

/* Run the main loop */

1269

2179

1270

2180

if(debug){

1271

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

1272

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1275

2190

1276

2191

end:

1277

2192

1278

2193

if(debug){

1279

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

2194

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

1280

2195

}

1281

2196

1282

2197

/* Cleanup things */

1299

2214

gpgme_release(mc.ctx);

1300

2215

}

1301

2216

1302

/* Removes the temp directory used by GPGME */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2264

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

1303

2265

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

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1324

2273

char *fullname = NULL;

1325

2274

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

1326

2275

direntry->d_name);

1327

2276

if(ret < 0){

1328

perror("asprintf");

2277

perror_plus("asprintf");

1329

2278

continue;

1330

2279

}

1331

2280

ret = remove(fullname);

1332

2281

if(ret == -1){

1333

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

1334

strerror(errno));

2282

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

2283

strerror(errno));

1335

2284

}

1336

2285

free(fullname);

1337

2286

}

1338

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1339

2293

}

1340

2294

ret = rmdir(tempdir);

1341

2295

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

1342

perror("rmdir");

1343

}

2296

perror_plus("rmdir");

2297

}

2298

}

2299

2300

if(quit_now){

2301

sigemptyset(&old_sigterm_action.sa_mask);

2302

old_sigterm_action.sa_handler = SIG_DFL;

2303

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2304

&old_sigterm_action,

2305

NULL));

2306

if(ret == -1){

2307

perror_plus("sigaction");

2308

}

2309

do {

2310

ret = raise(signal_received);

2311

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

2312

if(ret != 0){

2313

perror_plus("raise");

2314

abort();

2315

}

2316

TEMP_FAILURE_RETRY(pause());

1344

2317

}

1345

2318

1346

2319

return exitcode;