/mandos/release : revision 237.2.176

9

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

10

*

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* Everything else is

12

13

12

13

14

*

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

16

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

26

* along with this program. If not, see

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

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*

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

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

56

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

56

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

57

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

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inet_pton(), connect() */

59

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

62

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

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strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

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

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

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67

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

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68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

74

73

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

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74

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

76

75

setgid(), pause() */

77

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

76

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

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77

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

79

78

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

80

79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

87

91

88

#ifdef __linux__

92

89

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

110

107

init_gnutls_session(),

111

108

GNUTLS_* */

112

109

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

115

112

116

113

/* GPGME */

117

114

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

125

122

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

126

123

#define SECKEY "seckey.txt"

127

124

#define PUBKEY "pubkey.txt"

128

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

129

125

130

126

bool debug = false;

131

127

static const char mandos_protocol_version[] = "1";

132

128

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

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;

129

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

148

130

149

131

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

150

132

typedef struct {

155

137

gnutls_dh_params_t dh_params;

156

138

const char *priority;

157

139

gpgme_ctx_t ctx;

158

server *current_server;

159

140

} mandos_context;

160

141

161

142

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

162

143

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

163

144

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

145

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

166

146

167

147

sig_atomic_t quit_now = 0;

168

148

int signal_received = 0;

169

149

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

}

185

186

150

/*

187

151

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

188

152

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

189

153

* "buffer_length" is how much is already used.

190

154

*/

191

155

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

156

size_t buffer_capacity){

193

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

158

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

195

159

if(buffer == NULL){

200

164

return buffer_capacity;

201

165

}

202

166

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

240

167

/*

241

168

* Initialize GPGME.

242

169

*/

243

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

244

const char *tempdir){

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

245

172

gpgme_error_t rc;

246

173

gpgme_engine_info_t engine_info;

247

174

256

183

257

184

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

258

185

if(fd == -1){

259

perror_plus("open");

186

perror("open");

260

187

return false;

261

188

}

262

189

263

190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

191

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

192

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

193

gpgme_strsource(rc), gpgme_strerror(rc));

267

194

return false;

268

195

}

269

196

270

197

rc = gpgme_op_import(mc.ctx, pgp_data);

271

198

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

274

201

return false;

275

202

}

276

203

277

204

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

278

205

if(ret == -1){

279

perror_plus("close");

206

perror("close");

280

207

}

281

208

gpgme_data_release(pgp_data);

282

209

return true;

283

210

}

284

211

285

212

if(debug){

286

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

213

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

287

214

}

288

215

289

216

/* Init GPGME */

290

217

gpgme_check_version(NULL);

291

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

219

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

295

222

return false;

296

223

}

297

224

298

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

225

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

299

226

rc = gpgme_get_engine_info(&engine_info);

300

227

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

303

230

return false;

304

231

}

305

232

while(engine_info != NULL){

311

238

engine_info = engine_info->next;

312

239

}

313

240

if(engine_info == NULL){

314

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

315

tempdir);

241

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

316

242

return false;

317

243

}

318

244

319

245

/* Create new GPGME "context" */

320

246

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

321

247

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

325

250

return false;

326

251

}

327

252

346

271

ssize_t plaintext_length = 0;

347

272

348

273

if(debug){

349

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

274

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

350

275

}

351

276

352

277

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

353

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

279

0);

355

280

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

358

283

return -1;

359

284

}

360

285

361

286

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

362

287

rc = gpgme_data_new(&dh_plain);

363

288

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

367

291

gpgme_data_release(dh_crypto);

368

292

return -1;

369

293

}

372

296

data buffer */

373

297

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

374

298

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

377

301

plaintext_length = -1;

378

302

if(debug){

379

303

gpgme_decrypt_result_t result;

380

304

result = gpgme_op_decrypt_result(mc.ctx);

381

305

if(result == NULL){

382

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

306

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

383

307

} else {

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);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

388

312

if(result->file_name != NULL){

389

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

313

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

390

314

}

391

315

gpgme_recipient_t recipient;

392

316

recipient = result->recipients;

393

317

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

401

324

recipient = recipient->next;

402

325

}

403

326

}

406

329

}

407

330

408

331

if(debug){

409

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

332

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

410

333

}

411

334

412

335

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

413

336

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

414

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

415

338

plaintext_length = -1;

416

339

goto decrypt_end;

417

340

}

419

342

*plaintext = NULL;

420

343

while(true){

421

344

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

424

347

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

428

351

}

429

352

430

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

358

break;

436

359

}

437

360

if(ret < 0){

438

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

439

362

plaintext_length = -1;

440

363

goto decrypt_end;

441

364

}

443

366

}

444

367

445

368

if(debug){

446

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

369

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

447

370

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

448

371

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

449

372

}

471

394

/* GnuTLS log function callback */

472

395

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

473

396

const char* string){

474

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

397

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

475

398

}

476

399

477

400

static int init_gnutls_global(const char *pubkeyfilename,

479

402

int ret;

480

403

481

404

if(debug){

482

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

405

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

483

406

}

484

407

485

408

ret = gnutls_global_init();

486

409

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

410

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

411

safer_gnutls_strerror(ret));

489

412

return -1;

490

413

}

491

414

498

421

}

499

422

500

423

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

502

425

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

505

431

gnutls_global_deinit();

506

432

return -1;

507

433

}

508

434

509

435

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

436

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

437

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

438

seckeyfilename);

514

439

}

515

440

516

441

ret = gnutls_certificate_set_openpgp_key_file

517

442

(mc.cred, pubkeyfilename, seckeyfilename,

518

443

GNUTLS_OPENPGP_FMT_BASE64);

519

444

if(ret != GNUTLS_E_SUCCESS){

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

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

525

450

goto globalfail;

526

451

}

527

452

528

453

/* GnuTLS server initialization */

529

454

ret = gnutls_dh_params_init(&mc.dh_params);

530

455

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

456

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

457

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

534

458

goto globalfail;

535

459

}

536

460

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

537

461

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

462

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

463

safer_gnutls_strerror(ret));

540

464

goto globalfail;

541

465

}

542

466

562

486

}

563

487

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

564

488

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

568

491

}

569

492

570

493

{

577

500

}

578

501

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

579

502

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

583

506

gnutls_deinit(*session);

584

507

return -1;

585

508

}

594

517

}

595

518

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

596

519

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

599

522

gnutls_deinit(*session);

600

523

return -1;

601

524

}

646

569

pf = PF_INET;

647

570

break;

648

571

default:

649

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

572

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

650

573

errno = EINVAL;

651

574

return -1;

652

575

}

657

580

}

658

581

659

582

if(debug){

660

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

661

PRIu16 "\n", ip, port);

583

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

584

"\n", ip, port);

662

585

}

663

586

664

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

588

if(tcp_sd < 0){

666

589

int e = errno;

667

perror_plus("socket");

590

perror("socket");

668

591

errno = e;

669

592

goto mandos_end;

670

593

}

684

607

}

685

608

if(ret < 0 ){

686

609

int e = errno;

687

perror_plus("inet_pton");

610

perror("inet_pton");

688

611

errno = e;

689

612

goto mandos_end;

690

613

}

691

614

if(ret == 0){

692

615

int e = errno;

693

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

616

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

694

617

errno = e;

695

618

goto mandos_end;

696

619

}

701

624

702

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

626

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

704

-Wunreachable-code*/

627

-Wunreachable-code*/

705

628

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

708

631

errno = EINVAL;

709

632

goto mandos_end;

710

633

}

726

649

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

727

650

char interface[IF_NAMESIZE];

728

651

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

729

perror_plus("if_indextoname");

652

perror("if_indextoname");

730

653

} else {

731

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

732

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

654

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

655

ip, interface, port);

733

656

}

734

657

} else {

735

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

736

ip, port);

658

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

659

port);

737

660

}

738

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

669

sizeof(addrstr));

747

670

}

748

671

if(pcret == NULL){

749

perror_plus("inet_ntop");

672

perror("inet_ntop");

750

673

} else {

751

674

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

752

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

675

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

753

676

}

754

677

}

755

678

}

765

688

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

766

689

}

767

690

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

691

int e = errno;

692

perror("connect");

693

errno = e;

773

694

goto mandos_end;

774

695

}

775

696

783

704

while(true){

784

705

size_t out_size = strlen(out);

785

706

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

786

out_size - written));

707

out_size - written));

787

708

if(ret == -1){

788

709

int e = errno;

789

perror_plus("write");

710

perror("write");

790

711

errno = e;

791

712

goto mandos_end;

792

713

}

809

730

}

810

731

811

732

if(debug){

812

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

733

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

813

734

}

814

735

815

736

if(quit_now){

817

738

goto mandos_end;

818

739

}

819

740

820

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

821

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

742

823

743

if(quit_now){

835

755

836

756

if(ret != GNUTLS_E_SUCCESS){

837

757

if(debug){

838

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

758

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

839

759

gnutls_perror(ret);

840

760

}

841

761

errno = EPROTO;

845

765

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

846

766

847

767

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

768

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

769

ip);

850

770

}

851

771

852

772

while(true){

857

777

}

858

778

859

779

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

780

buffer_capacity);

861

781

if(buffer_capacity == 0){

862

782

int e = errno;

863

perror_plus("incbuffer");

783

perror("incbuffer");

864

784

errno = e;

865

785

goto mandos_end;

866

786

}

890

810

}

891

811

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

892

812

if(ret < 0){

893

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

894

"***\n");

813

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

895

814

gnutls_perror(ret);

896

815

errno = EPROTO;

897

816

goto mandos_end;

898

817

}

899

818

break;

900

819

default:

901

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

902

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

903

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

823

errno = EIO;

905

824

goto mandos_end;

910

829

}

911

830

912

831

if(debug){

913

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

832

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

914

833

}

915

834

916

835

if(quit_now){

928

847

929

848

if(buffer_length > 0){

930

849

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

932

852

&decrypted_buffer);

933

853

if(decrypted_buffer_size >= 0){

934

854

945

865

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

946

866

int e = errno;

947

867

if(debug){

948

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

949

strerror(errno));

868

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

869

strerror(errno));

950

870

}

951

871

errno = e;

952

872

goto mandos_end;

971

891

if(e == 0){

972

892

e = errno;

973

893

}

974

perror_plus("close");

894

perror("close");

975

895

}

976

896

gnutls_deinit(session);

977

errno = e;

978

897

if(quit_now){

979

errno = EINTR;

898

e = EINTR;

980

899

retval = -1;

981

900

}

901

errno = e;

982

902

}

983

903

return retval;

984

904

}

1009

929

switch(event){

1010

930

default:

1011

931

case AVAHI_RESOLVER_FAILURE:

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)));

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1016

935

break;

1017

936

1018

937

case AVAHI_RESOLVER_FOUND:

1020

939

char ip[AVAHI_ADDRESS_STR_MAX];

1021

940

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

1022

941

if(debug){

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);

942

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

943

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

944

ip, (intmax_t)interface, port);

1026

945

}

1027

946

int ret = start_mandos_communication(ip, port, interface,

1028

947

avahi_proto_to_af(proto));

1029

948

if(ret == 0){

1030

949

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

950

}

1035

951

}

1036

952

}

1060

976

default:

1061

977

case AVAHI_BROWSER_FAILURE:

1062

978

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

1065

981

avahi_simple_poll_quit(mc.simple_poll);

1066

982

return;

1067

983

1074

990

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

1075

991

name, type, domain, protocol, 0,

1076

992

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

993

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

994

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

1080

995

break;

1081

996

1082

997

case AVAHI_BROWSER_REMOVE:

1085

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1002

if(debug){

1088

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

1089

" searching...\n");

1003

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

1090

1004

}

1091

1005

break;

1092

1006

}

1093

1007

}

1094

1008

1095

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

1009

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

1096

1010

static void handle_sigterm(int sig){

1097

1011

if(quit_now){

1098

1012

return;

1100

1014

quit_now = 1;

1101

1015

signal_received = sig;

1102

1016

int old_errno = errno;

1103

/* set main loop to exit */

1104

1017

if(mc.simple_poll != NULL){

1105

1018

avahi_simple_poll_quit(mc.simple_poll);

1106

1019

}

1107

1020

errno = old_errno;

1108

1021

}

1109

1022

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

1477

1023

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

1478

1024

AvahiSServiceBrowser *sb = NULL;

1479

1025

int error;

1481

1027

intmax_t tmpmax;

1482

1028

char *tmp;

1483

1029

int exitcode = EXIT_SUCCESS;

1484

const char *interface = "";

1030

const char *interface = "eth0";

1485

1031

struct ifreq network;

1486

1032

int sd = -1;

1487

1033

bool take_down_interface = false;

1488

1034

uid_t uid;

1489

1035

gid_t gid;

1036

char *connect_to = NULL;

1490

1037

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

1491

1038

bool tempdir_created = false;

1492

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1496

1043

bool gnutls_initialized = false;

1497

1044

bool gpgme_initialized = false;

1498

1045

float delay = 2.5f;

1499

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

1500

retrying the same server again */

1501

1046

1502

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1503

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1509

1054

errno = 0;

1510

1055

ret = setgid(gid);

1511

1056

if(ret == -1){

1512

perror_plus("setgid");

1057

perror("setgid");

1513

1058

}

1514

1059

1515

1060

/* Lower user privileges (temporarily) */

1516

1061

errno = 0;

1517

1062

ret = seteuid(uid);

1518

1063

if(ret == -1){

1519

perror_plus("seteuid");

1064

perror("seteuid");

1520

1065

}

1521

1066

1522

1067

if(quit_now){

1557

1102

.arg = "SECONDS",

1558

1103

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

1559

1104

.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

1105

/*

1569

1106

* These reproduce what we would get without ARGP_NO_HELP

1570

1107

*/

1614

1151

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

1615

1152

argp_error(state, "Bad delay");

1616

1153

}

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

1154

break;

1629

1155

/*

1630

1156

* These reproduce what we would get without ARGP_NO_HELP

1637

1163

argp_state_help(state, state->out_stream,

1638

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

1165

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);

1166

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

1643

1167

exit(argp_err_exit_status);

1644

1168

break;

1645

1169

default:

1660

1184

case ENOMEM:

1661

1185

default:

1662

1186

errno = ret;

1663

perror_plus("argp_parse");

1187

perror("argp_parse");

1664

1188

exitcode = EX_OSERR;

1665

1189

goto end;

1666

1190

case EINVAL:

1668

1192

goto end;

1669

1193

}

1670

1194

}

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");

1750

}

1751

}

1752

1195

1753

1196

if(not debug){

1754

1197

avahi_set_log_function(empty_log);

1755

1198

}

1756

1199

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

1789

1200

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

1790

1201

from the signal handler */

1791

1202

/* Initialize the pseudo-RNG for Avahi */

1792

1203

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

1793

1204

mc.simple_poll = avahi_simple_poll_new();

1794

1205

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1206

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

1797

1207

exitcode = EX_UNAVAILABLE;

1798

1208

goto end;

1799

1209

}

1801

1211

sigemptyset(&sigterm_action.sa_mask);

1802

1212

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

1803

1213

if(ret == -1){

1804

perror_plus("sigaddset");

1214

perror("sigaddset");

1805

1215

exitcode = EX_OSERR;

1806

1216

goto end;

1807

1217

}

1808

1218

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

1809

1219

if(ret == -1){

1810

perror_plus("sigaddset");

1220

perror("sigaddset");

1811

1221

exitcode = EX_OSERR;

1812

1222

goto end;

1813

1223

}

1814

1224

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

1815

1225

if(ret == -1){

1816

perror_plus("sigaddset");

1226

perror("sigaddset");

1817

1227

exitcode = EX_OSERR;

1818

1228

goto end;

1819

1229

}

1823

1233

*/

1824

1234

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

1825

1235

if(ret == -1){

1826

perror_plus("sigaction");

1236

perror("sigaction");

1827

1237

return EX_OSERR;

1828

1238

}

1829

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1830

1240

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

1831

1241

if(ret == -1){

1832

perror_plus("sigaction");

1242

perror("sigaction");

1833

1243

exitcode = EX_OSERR;

1834

1244

goto end;

1835

1245

}

1836

1246

}

1837

1247

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

1838

1248

if(ret == -1){

1839

perror_plus("sigaction");

1249

perror("sigaction");

1840

1250

return EX_OSERR;

1841

1251

}

1842

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1843

1253

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

1844

1254

if(ret == -1){

1845

perror_plus("sigaction");

1255

perror("sigaction");

1846

1256

exitcode = EX_OSERR;

1847

1257

goto end;

1848

1258

}

1849

1259

}

1850

1260

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

1851

1261

if(ret == -1){

1852

perror_plus("sigaction");

1262

perror("sigaction");

1853

1263

return EX_OSERR;

1854

1264

}

1855

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1856

1266

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

1857

1267

if(ret == -1){

1858

perror_plus("sigaction");

1268

perror("sigaction");

1859

1269

exitcode = EX_OSERR;

1860

1270

goto end;

1861

1271

}

1862

1272

}

1863

1273

1864

1274

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

1865

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

1275

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

1866

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

1277

if(if_index == 0){

1868

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

1278

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

1869

1279

exitcode = EX_UNAVAILABLE;

1870

1280

goto end;

1871

1281

}

1878

1288

errno = 0;

1879

1289

ret = seteuid(0);

1880

1290

if(ret == -1){

1881

perror_plus("seteuid");

1291

perror("seteuid");

1882

1292

}

1883

1293

1884

1294

#ifdef __linux__

1888

1298

bool restore_loglevel = true;

1889

1299

if(ret == -1){

1890

1300

restore_loglevel = false;

1891

perror_plus("klogctl");

1301

perror("klogctl");

1892

1302

}

1893

1303

#endif /* __linux__ */

1894

1304

1895

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

1306

if(sd < 0){

1897

perror_plus("socket");

1307

perror("socket");

1898

1308

exitcode = EX_OSERR;

1899

1309

#ifdef __linux__

1900

1310

if(restore_loglevel){

1901

1311

ret = klogctl(7, NULL, 0);

1902

1312

if(ret == -1){

1903

perror_plus("klogctl");

1313

perror("klogctl");

1904

1314

}

1905

1315

}

1906

1316

#endif /* __linux__ */

1908

1318

errno = 0;

1909

1319

ret = seteuid(uid);

1910

1320

if(ret == -1){

1911

perror_plus("seteuid");

1321

perror("seteuid");

1912

1322

}

1913

1323

goto end;

1914

1324

}

1915

1325

strcpy(network.ifr_name, interface);

1916

1326

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

1917

1327

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1328

perror("ioctl SIOCGIFFLAGS");

1919

1329

#ifdef __linux__

1920

1330

if(restore_loglevel){

1921

1331

ret = klogctl(7, NULL, 0);

1922

1332

if(ret == -1){

1923

perror_plus("klogctl");

1333

perror("klogctl");

1924

1334

}

1925

1335

}

1926

1336

#endif /* __linux__ */

1929

1339

errno = 0;

1930

1340

ret = seteuid(uid);

1931

1341

if(ret == -1){

1932

perror_plus("seteuid");

1342

perror("seteuid");

1933

1343

}

1934

1344

goto end;

1935

1345

}

1939

1349

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

1940

1350

if(ret == -1){

1941

1351

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1352

perror("ioctl SIOCSIFFLAGS");

1943

1353

exitcode = EX_OSERR;

1944

1354

#ifdef __linux__

1945

1355

if(restore_loglevel){

1946

1356

ret = klogctl(7, NULL, 0);

1947

1357

if(ret == -1){

1948

perror_plus("klogctl");

1358

perror("klogctl");

1949

1359

}

1950

1360

}

1951

1361

#endif /* __linux__ */

1953

1363

errno = 0;

1954

1364

ret = seteuid(uid);

1955

1365

if(ret == -1){

1956

perror_plus("seteuid");

1366

perror("seteuid");

1957

1367

}

1958

1368

goto end;

1959

1369

}

1960

1370

}

1961

/* Sleep checking until interface is running.

1962

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

1371

/* sleep checking until interface is running */

1963

1372

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

1964

1373

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

1965

1374

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1375

perror("ioctl SIOCGIFFLAGS");

1967

1376

} else if(network.ifr_flags & IFF_RUNNING){

1968

1377

break;

1969

1378

}

1970

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

1380

ret = nanosleep(&sleeptime, NULL);

1972

1381

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

1973

perror_plus("nanosleep");

1382

perror("nanosleep");

1974

1383

}

1975

1384

}

1976

1385

if(not take_down_interface){

1977

1386

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

1978

1387

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

1979

1388

if(ret == -1){

1980

perror_plus("close");

1389

perror("close");

1981

1390

}

1982

1391

}

1983

1392

#ifdef __linux__

1985

1394

/* Restores kernel loglevel to default */

1986

1395

ret = klogctl(7, NULL, 0);

1987

1396

if(ret == -1){

1988

perror_plus("klogctl");

1397

perror("klogctl");

1989

1398

}

1990

1399

}

1991

1400

#endif /* __linux__ */

1992

1401

/* Lower privileges */

1993

1402

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1998

1415

}

1999

1416

}

2000

1417

2004

1421

2005

1422

ret = init_gnutls_global(pubkey, seckey);

2006

1423

if(ret == -1){

2007

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

1424

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

2008

1425

exitcode = EX_UNAVAILABLE;

2009

1426

goto end;

2010

1427

} else {

2015

1432

goto end;

2016

1433

}

2017

1434

1435

tempdir_created = true;

2018

1436

if(mkdtemp(tempdir) == NULL){

2019

perror_plus("mkdtemp");

1437

tempdir_created = false;

1438

perror("mkdtemp");

2020

1439

goto end;

2021

1440

}

2022

tempdir_created = true;

2023

1441

2024

1442

if(quit_now){

2025

1443

goto end;

2026

1444

}

2027

1445

2028

1446

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

2029

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

1447

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

2030

1448

exitcode = EX_UNAVAILABLE;

2031

1449

goto end;

2032

1450

} else {

2042

1460

/* (Mainly meant for debugging) */

2043

1461

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

2044

1462

if(address == NULL){

2045

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

1463

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

2046

1464

exitcode = EX_USAGE;

2047

1465

goto end;

2048

1466

}

2056

1474

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

2057

1475

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

2058

1476

or tmpmax != (uint16_t)tmpmax){

2059

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

1477

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

2060

1478

exitcode = EX_USAGE;

2061

1479

goto end;

2062

1480

}

2067

1485

2068

1486

port = (uint16_t)tmpmax;

2069

1487

*address = '\0';

1488

address = connect_to;

2070

1489

/* Colon in address indicates IPv6 */

2071

1490

int af;

2072

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

1491

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

2073

1492

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

}

2080

1493

} else {

2081

1494

af = AF_INET;

2082

1495

}

2083

address = connect_to;

2084

1496

2085

1497

if(quit_now){

2086

1498

goto end;

2087

1499

}

2088

1500

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){

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2102

1523

exitcode = EXIT_SUCCESS;

2103

1524

}

2104

2105

1525

goto end;

2106

1526

}

2107

1527

2129

1549

2130

1550

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

2131

1551

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

1552

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

1553

avahi_strerror(error));

2134

1554

exitcode = EX_UNAVAILABLE;

2135

1555

goto end;

2136

1556

}

2144

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

1565

NULL, 0, browse_callback, NULL);

2146

1566

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2149

1569

exitcode = EX_UNAVAILABLE;

2150

1570

goto end;

2151

1571

}

2157

1577

/* Run the main loop */

2158

1578

2159

1579

if(debug){

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

}

1580

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

1581

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2169

1584

2170

1585

end:

2171

1586

2172

1587

if(debug){

2173

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

1588

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

2174

1589

}

2175

1590

2176

1591

/* Cleanup things */

2192

1607

if(gpgme_initialized){

2193

1608

gpgme_release(mc.ctx);

2194

1609

}

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

1610

2207

/* Re-raise priviliges */

2208

{

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

2209

1614

errno = 0;

2210

1615

ret = seteuid(0);

2211

1616

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){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

2221

1620

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

2222

1621

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

2225

1624

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

2226

1625

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

2227

1626

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1627

perror("ioctl SIOCSIFFLAGS");

2229

1628

}

2230

1629

}

2231

1630

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

2232

1631

if(ret == -1){

2233

perror_plus("close");

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

2234

1639

}

2235

1640

}

2236

1641

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

1642

2244

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

1643

/* Removes the temp directory used by GPGME */

2245

1644

if(tempdir_created){

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];

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2253

1665

char *fullname = NULL;

2254

1666

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

2255

1667

direntry->d_name);

2256

1668

if(ret < 0){

2257

perror_plus("asprintf");

1669

perror("asprintf");

2258

1670

continue;

2259

1671

}

2260

1672

ret = remove(fullname);

2261

1673

if(ret == -1){

2262

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

2263

strerror(errno));

1674

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

1675

strerror(errno));

2264

1676

}

2265

1677

free(fullname);

2266

1678

}

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");

1679

closedir(d);

2273

1680

}

2274

1681

ret = rmdir(tempdir);

2275

1682

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

2276

perror_plus("rmdir");

1683

perror("rmdir");

2277

1684

}

2278

1685

}

2279

1686

2284

1691

&old_sigterm_action,

2285

1692

NULL));

2286

1693

if(ret == -1){

2287

perror_plus("sigaction");

1694

perror("sigaction");

2288

1695

}

2289

1696

do {

2290

1697

ret = raise(signal_received);

2291

1698

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

2292

1699

if(ret != 0){

2293

perror_plus("raise");

1700

perror("raise");

2294

1701

abort();

2295

1702

}

2296

1703

TEMP_FAILURE_RETRY(pause());