/mandos/release : revision 237.23.1

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

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

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

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() */

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

setgid(), pause() */

77

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

87

88

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

91

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

92

#include <argz.h> /* argz_add_sep(), argz_next(),

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

97

EAI_SYSTEM, gai_strerror() */

90

98

91

99

#ifdef __linux__

92

100

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

134

142

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

135

143

char *connect_to = NULL;

136

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

137

148

138

149

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

139

150

typedef struct server{

140

151

const char *ip;

141

uint16_t port;

152

in_port_t port;

142

153

AvahiIfIndex if_index;

143

154

int af;

144

155

struct timespec last_seen;

148

159

149

160

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

150

161

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

162

AvahiServer *server;

153

163

gnutls_certificate_credentials_t cred;

154

164

unsigned int dh_bits;

156

166

const char *priority;

157

167

gpgme_ctx_t ctx;

158

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

159

171

} mandos_context;

160

172

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

166

175

167

176

sig_atomic_t quit_now = 0;

168

177

int signal_received = 0;

169

178

170

179

/* Function to use when printing errors */

171

180

void perror_plus(const char *print_text){

181

int e = errno;

172

182

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

173

183

program_invocation_short_name);

184

errno = e;

174

185

perror(print_text);

175

186

}

176

187

188

__attribute__((format (gnu_printf, 2, 3), nonnull))

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

177

198

/*

178

199

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

179

200

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

180

201

* "buffer_length" is how much is already used.

181

202

*/

203

__attribute__((nonnull, warn_unused_result))

182

204

size_t incbuffer(char **buffer, size_t buffer_length,

183

205

size_t buffer_capacity){

184

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

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

186

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

187

213

return 0;

188

214

}

215

*buffer = new_buf;

189

216

buffer_capacity += BUFFER_SIZE;

190

217

}

191

218

return buffer_capacity;

192

219

}

193

220

194

221

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

195

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

196

int af){

222

__attribute__((nonnull, warn_unused_result))

223

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

224

int af, server **current_server){

197

225

int ret;

198

226

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

199

227

if(new_server == NULL){

200

228

perror_plus("malloc");

201

return -1;

229

return false;

202

230

}

203

231

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

204

232

.port = port,

206

234

.af = af };

207

235

if(new_server->ip == NULL){

208

236

perror_plus("strdup");

209

return -1;

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

210

253

}

211

254

/* Special case of first server */

212

if (mc.current_server == NULL){

255

if(*current_server == NULL){

213

256

new_server->next = new_server;

214

257

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

258

*current_server = new_server;

217

259

} else {

218

new_server->next = mc.current_server;

219

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

260

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

261

new_server->next = *current_server;

262

new_server->prev = (*current_server)->prev;

220

263

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

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

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

264

(*current_server)->prev = new_server;

265

}

266

return true;

229

267

}

230

268

231

269

/*

232

270

* Initialize GPGME.

233

271

*/

234

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

235

const char *tempdir){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

236

277

gpgme_error_t rc;

237

278

gpgme_engine_info_t engine_info;

238

279

239

240

280

/*

241

281

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

242

282

*/

243

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

244

284

int ret;

245

285

int fd;

246

286

gpgme_data_t pgp_data;

253

293

254

294

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

295

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

258

gpgme_strsource(rc), gpgme_strerror(rc));

296

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

297

gpgme_strsource(rc), gpgme_strerror(rc));

259

298

return false;

260

299

}

261

300

262

rc = gpgme_op_import(mc.ctx, pgp_data);

301

rc = gpgme_op_import(mc->ctx, pgp_data);

263

302

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

267

305

return false;

268

306

}

269

307

276

314

}

277

315

278

316

if(debug){

279

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

280

"Initializing GPGME\n");

317

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

281

318

}

282

319

283

320

/* Init GPGME */

284

321

gpgme_check_version(NULL);

285

322

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

323

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

290

326

return false;

291

327

}

292

328

293

329

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

294

330

rc = gpgme_get_engine_info(&engine_info);

295

331

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

299

334

return false;

300

335

}

301

336

while(engine_info != NULL){

307

342

engine_info = engine_info->next;

308

343

}

309

344

if(engine_info == NULL){

310

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

311

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

345

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

346

tempdir);

312

347

return false;

313

348

}

314

349

315

350

/* Create new GPGME "context" */

316

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

351

rc = gpgme_new(&(mc->ctx));

317

352

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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

320

gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

321

356

return false;

322

357

}

323

358

332

367

* Decrypt OpenPGP data.

333

368

* Returns -1 on error

334

369

*/

370

__attribute__((nonnull, warn_unused_result))

335

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

336

372

size_t crypto_size,

337

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

338

375

gpgme_data_t dh_crypto, dh_plain;

339

376

gpgme_error_t rc;

340

377

ssize_t ret;

342

379

ssize_t plaintext_length = 0;

343

380

344

381

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

382

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

347

383

}

348

384

349

385

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

350

386

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

387

0);

352

388

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

356

391

return -1;

357

392

}

358

393

359

394

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

360

395

rc = gpgme_data_new(&dh_plain);

361

396

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

365

400

gpgme_data_release(dh_crypto);

366

401

return -1;

367

402

}

368

403

369

404

/* Decrypt data from the cryptotext data buffer to the plaintext

370

405

data buffer */

371

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

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

372

407

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

376

410

plaintext_length = -1;

377

411

if(debug){

378

412

gpgme_decrypt_result_t result;

379

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

380

414

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

415

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

383

416

} else {

384

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

385

"Unsupported algorithm: %s\n",

386

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

390

421

if(result->file_name != NULL){

391

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

392

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

422

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

393

423

}

394

424

gpgme_recipient_t recipient;

395

425

recipient = result->recipients;

396

426

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

406

434

recipient = recipient->next;

407

435

}

408

436

}

411

439

}

412

440

413

441

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

442

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

416

443

}

417

444

418

445

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

449

476

}

450

477

451

478

if(debug){

452

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

453

"Decrypted password is: ");

479

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

454

480

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

455

481

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

456

482

}

467

493

return plaintext_length;

468

494

}

469

495

470

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value); /* Spurious warning from

472

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

473

499

if(ret == NULL)

474

500

ret = "(unknown)";

475

501

return ret;

476

502

}

477

503

478

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

479

506

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

480

507

const char* string){

481

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

508

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

482

509

}

483

510

511

__attribute__((nonnull, warn_unused_result))

484

512

static int init_gnutls_global(const char *pubkeyfilename,

485

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

486

515

int ret;

487

516

488

517

if(debug){

489

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

490

"Initializing GnuTLS\n");

518

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

491

519

}

492

520

493

521

ret = gnutls_global_init();

494

522

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

523

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

524

safer_gnutls_strerror(ret));

497

525

return -1;

498

526

}

499

527

506

534

}

507

535

508

536

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

538

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

539

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

540

safer_gnutls_strerror(ret));

513

541

gnutls_global_deinit();

514

542

return -1;

515

543

}

516

544

517

545

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

520

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

521

seckeyfilename);

546

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

547

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

548

pubkeyfilename,

549

seckeyfilename);

522

550

}

523

551

524

552

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

526

554

GNUTLS_OPENPGP_FMT_BASE64);

527

555

if(ret != GNUTLS_E_SUCCESS){

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

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

531

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

532

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

533

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

556

fprintf_plus(stderr,

557

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

558

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

559

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

560

safer_gnutls_strerror(ret));

534

561

goto globalfail;

535

562

}

536

563

537

564

/* GnuTLS server initialization */

538

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

539

566

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

" initialization: %s\n",

569

safer_gnutls_strerror(ret));

543

570

goto globalfail;

544

571

}

545

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

572

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

546

573

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

549

safer_gnutls_strerror(ret));

574

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

575

safer_gnutls_strerror(ret));

550

576

goto globalfail;

551

577

}

552

578

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

554

580

555

581

return 0;

556

582

557

583

globalfail:

558

584

559

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

560

586

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

562

588

return -1;

563

589

}

564

590

565

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

566

594

int ret;

567

595

/* GnuTLS session creation */

568

596

do {

572

600

}

573

601

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

574

602

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

577

safer_gnutls_strerror(ret));

603

fprintf_plus(stderr,

604

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

605

safer_gnutls_strerror(ret));

578

606

}

579

607

580

608

{

581

609

const char *err;

582

610

do {

583

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

611

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

584

612

if(quit_now){

585

613

gnutls_deinit(*session);

586

614

return -1;

587

615

}

588

616

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

589

617

if(ret != GNUTLS_E_SUCCESS){

590

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

591

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

592

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

593

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

618

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

619

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

620

safer_gnutls_strerror(ret));

594

621

gnutls_deinit(*session);

595

622

return -1;

596

623

}

598

625

599

626

do {

600

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

601

mc.cred);

628

mc->cred);

602

629

if(quit_now){

603

630

gnutls_deinit(*session);

604

631

return -1;

605

632

}

606

633

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

607

634

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

635

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

636

safer_gnutls_strerror(ret));

611

637

gnutls_deinit(*session);

612

638

return -1;

613

639

}

615

641

/* ignore client certificate if any. */

616

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

617

643

618

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

619

645

620

646

return 0;

621

647

}

625

651

__attribute__((unused)) const char *txt){}

626

652

627

653

/* Called when a Mandos server is found */

628

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

654

__attribute__((nonnull, warn_unused_result))

655

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

629

656

AvahiIfIndex if_index,

630

int af){

657

int af, mandos_context *mc){

631

658

int ret, tcp_sd = -1;

632

659

ssize_t sret;

633

union {

634

struct sockaddr_in in;

635

struct sockaddr_in6 in6;

636

} to;

660

struct sockaddr_storage to;

637

661

char *buffer = NULL;

638

662

char *decrypted_buffer = NULL;

639

663

size_t buffer_length = 0;

658

682

pf = PF_INET;

659

683

break;

660

684

default:

661

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

662

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

685

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

663

686

errno = EINVAL;

664

687

return -1;

665

688

}

666

689

667

ret = init_gnutls_session(&session);

690

/* If the interface is specified and we have a list of interfaces */

691

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

692

/* Check if the interface is one of the interfaces we are using */

693

bool match = false;

694

{

695

char *interface = NULL;

696

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

697

interface))){

698

if(if_nametoindex(interface) == (unsigned int)if_index){

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

/* This interface does not match any in the list, so we don't

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

fprintf_plus(stderr, "Skipping server on non-used interface"

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

668

723

if(ret != 0){

669

724

return -1;

670

725

}

671

726

672

727

if(debug){

673

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

674

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

675

"\n", ip, port);

728

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

729

PRIuMAX "\n", ip, (uintmax_t)port);

676

730

}

677

731

678

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

744

691

745

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

692

746

if(af == AF_INET6){

693

to.in6.sin6_family = (sa_family_t)af;

694

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

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

695

749

} else { /* IPv4 */

696

to.in.sin_family = (sa_family_t)af;

697

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

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

698

752

}

699

753

if(ret < 0 ){

700

754

int e = errno;

704

758

}

705

759

if(ret == 0){

706

760

int e = errno;

707

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

708

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

761

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

709

762

errno = e;

710

763

goto mandos_end;

711

764

}

712

765

if(af == AF_INET6){

713

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

714

-Wconversion and

715

-Wunreachable-code */

716

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

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

719

-Wunreachable-code*/

766

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

767

if(IN6_IS_ADDR_LINKLOCAL

768

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

720

769

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

770

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

771

" incomplete without a network interface\n");

724

772

errno = EINVAL;

725

773

goto mandos_end;

726

774

}

727

775

/* Set the network interface number as scope */

728

to.in6.sin6_scope_id = (uint32_t)if_index;

776

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

729

777

}

730

778

} else {

731

to.in.sin_port = htons(port); /* Spurious warnings from

732

-Wconversion and

733

-Wunreachable-code */

779

((struct sockaddr_in *)&to)->sin_port = htons(port);

734

780

}

735

781

736

782

if(quit_now){

744

790

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

745

791

perror_plus("if_indextoname");

746

792

} else {

747

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

748

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

749

ip, interface, port);

793

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

794

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

750

795

}

751

796

} else {

752

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

753

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

797

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

798

ip, (uintmax_t)port);

754

799

}

755

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

757

const char *pcret;

758

802

if(af == AF_INET6){

759

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

760

sizeof(addrstr));

803

ret = getnameinfo((struct sockaddr *)&to,

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

761

807

} else {

762

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

763

sizeof(addrstr));

808

ret = getnameinfo((struct sockaddr *)&to,

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

764

812

}

765

if(pcret == NULL){

766

perror_plus("inet_ntop");

767

} else {

768

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

769

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

770

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

771

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

817

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

818

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

772

819

}

773

820

}

774

821

778

825

}

779

826

780

827

if(af == AF_INET6){

781

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

828

ret = connect(tcp_sd, (struct sockaddr *)&to,

829

sizeof(struct sockaddr_in6));

782

830

} else {

783

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

831

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

832

sizeof(struct sockaddr_in));

784

833

}

785

834

if(ret < 0){

786

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

835

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

787

836

int e = errno;

788

837

perror_plus("connect");

789

838

errno = e;

827

876

}

828

877

829

878

if(debug){

830

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

831

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

879

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

832

880

}

833

881

834

882

if(quit_now){

836

884

goto mandos_end;

837

885

}

838

886

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

/* This casting via intptr_t is to eliminate warning about casting

888

an int to a pointer type. This is exactly how the GnuTLS Guile

889

function "set-session-transport-fd!" does it. */

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

841

892

842

893

if(quit_now){

843

894

errno = EINTR;

854

905

855

906

if(ret != GNUTLS_E_SUCCESS){

856

907

if(debug){

857

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

858

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

908

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

859

909

gnutls_perror(ret);

860

910

}

861

911

errno = EPROTO;

865

915

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

866

916

867

917

if(debug){

868

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

869

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

918

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

919

" %s\n", ip);

870

920

}

871

921

872

922

while(true){

910

960

}

911

961

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

912

962

if(ret < 0){

913

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

914

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

963

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

964

"***\n");

915

965

gnutls_perror(ret);

916

966

errno = EPROTO;

917

967

goto mandos_end;

918

968

}

919

969

break;

920

970

default:

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

971

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

972

" encrypted session with Mandos server\n");

924

973

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

974

errno = EIO;

926

975

goto mandos_end;

931

980

}

932

981

933

982

if(debug){

934

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

935

"Closing TLS session\n");

983

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

936

984

}

937

985

938

986

if(quit_now){

951

999

if(buffer_length > 0){

952

1000

ssize_t decrypted_buffer_size;

953

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

954

&decrypted_buffer);

1002

&decrypted_buffer, mc);

955

1003

if(decrypted_buffer_size >= 0){

956

1004

957

1005

written = 0;

967

1015

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

968

1016

int e = errno;

969

1017

if(debug){

970

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

971

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

972

strerror(errno));

1018

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

1019

strerror(errno));

973

1020

}

974

1021

errno = e;

975

1022

goto mandos_end;

1006

1053

return retval;

1007

1054

}

1008

1055

1056

__attribute__((nonnull))

1009

1057

static void resolve_callback(AvahiSServiceResolver *r,

1010

1058

AvahiIfIndex interface,

1011

1059

AvahiProtocol proto,

1019

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1020

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1021

1069

flags,

1022

AVAHI_GCC_UNUSED void* userdata){

1023

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1024

1074

1025

1075

/* Called whenever a service has been resolved successfully or

1026

1076

timed out */

1027

1077

1028

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1029

1080

return;

1030

1081

}

1031

1082

1032

1083

switch(event){

1033

1084

default:

1034

1085

case AVAHI_RESOLVER_FAILURE:

1035

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

1036

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

1037

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

1038

avahi_strerror(avahi_server_errno(mc.server)));

1086

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

1087

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

1088

domain,

1089

avahi_strerror(avahi_server_errno

1090

(((mandos_context*)mc)->server)));

1039

1091

break;

1040

1092

1041

1093

case AVAHI_RESOLVER_FOUND:

1043

1095

char ip[AVAHI_ADDRESS_STR_MAX];

1044

1096

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

1045

1097

if(debug){

1046

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

1047

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

1048

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

1049

ip, (intmax_t)interface, port);

1098

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

1099

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

1100

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

1050

1101

}

1051

int ret = start_mandos_communication(ip, port, interface,

1052

avahi_proto_to_af(proto));

1102

int ret = start_mandos_communication(ip, (in_port_t)port,

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1053

1106

if(ret == 0){

1054

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1055

1108

} else {

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1109

if(not add_server(ip, (in_port_t)port, interface,

1110

avahi_proto_to_af(proto),

1111

&((mandos_context*)mc)->current_server)){

1112

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1113

" list\n", name);

1114

}

1058

1115

}

1059

1116

}

1060

1117

}

1070

1127

const char *domain,

1071

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1072

1129

flags,

1073

AVAHI_GCC_UNUSED void* userdata){

1074

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1075

1134

1076

1135

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

1077

1136

is removed from the LAN */

1084

1143

default:

1085

1144

case AVAHI_BROWSER_FAILURE:

1086

1145

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1090

avahi_simple_poll_quit(mc.simple_poll);

1146

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

1147

avahi_strerror(avahi_server_errno

1148

(((mandos_context*)mc)->server)));

1149

avahi_simple_poll_quit(simple_poll);

1091

1150

return;

1092

1151

1093

1152

case AVAHI_BROWSER_NEW:

1096

1155

the callback function is called the Avahi server will free the

1097

1156

resolver for us. */

1098

1157

1099

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

1100

name, type, domain, protocol, 0,

1101

resolve_callback, NULL) == NULL)

1102

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

1103

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

1104

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

1158

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1162

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

1163

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

(((mandos_context*)mc)->server)));

1105

1166

break;

1106

1167

1107

1168

case AVAHI_BROWSER_REMOVE:

1110

1171

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

1172

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

1173

if(debug){

1113

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

1114

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

1174

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

1175

" searching...\n");

1115

1176

}

1116

1177

break;

1117

1178

}

1126

1187

signal_received = sig;

1127

1188

int old_errno = errno;

1128

1189

/* set main loop to exit */

1129

if(mc.simple_poll != NULL){

1130

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1131

1192

}

1132

1193

errno = old_errno;

1133

1194

}

1134

1195

1196

__attribute__((nonnull, warn_unused_result))

1135

1197

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

1136

1198

int ret;

1199

error_t ret_errno;

1137

1200

1138

1201

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

1139

1202

if(s < 0){

1203

ret_errno = errno;

1140

1204

perror_plus("socket");

1205

errno = ret_errno;

1141

1206

return false;

1142

1207

}

1143

1208

strcpy(ifr->ifr_name, ifname);

1144

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

1210

if(ret == -1){

1146

1211

if(debug){

1212

ret_errno = errno;

1147

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1148

1215

}

1149

1216

return false;

1150

1217

}

1151

1218

return true;

1152

1219

}

1153

1220

1221

__attribute__((nonnull, warn_unused_result))

1154

1222

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

1155

1223

1156

1224

/* Reject the loopback device */

1157

1225

if(ifr->ifr_flags & IFF_LOOPBACK){

1158

1226

if(debug){

1159

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

1160

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

1227

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

1228

ifname);

1161

1229

}

1162

1230

return false;

1163

1231

}

1164

1232

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

1165

1233

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

1166

1234

if(debug){

1167

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

1168

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

1235

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

1236

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

1169

1237

}

1170

1238

return true;

1171

1239

}

1172

1240

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

1173

1241

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

1174

1242

if(debug){

1175

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

1176

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

1243

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1244

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

1177

1245

}

1178

1246

return false;

1179

1247

}

1180

1248

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

1181

1249

if(ifr->ifr_flags & IFF_NOARP){

1182

1250

if(debug){

1183

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

1184

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

1251

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

1252

ifname);

1185

1253

}

1186

1254

return false;

1187

1255

}

1188

1256

1189

1257

/* Accept this device */

1190

1258

if(debug){

1191

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

1192

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

1259

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

1193

1260

}

1194

1261

return true;

1195

1262

}

1199

1266

* corresponds to an acceptable network device.

1200

1267

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

1201

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1202

1270

int good_interface(const struct dirent *if_entry){

1203

1271

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

1204

1272

return 0;

1207

1275

struct ifreq ifr;

1208

1276

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

1209

1277

if(debug){

1210

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

1211

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

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

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

1245

if(debug){

1246

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

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

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

1255

if(debug){

1256

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

1257

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

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1265

}

1266

return 1;

1267

}

1268

1278

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

1279

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

1280

}

1281

return 0;

1282

}

1283

1284

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

1285

return 0;

1286

}

1287

return 1;

1288

}

1289

1290

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

if(not get_flags(interface, &ifr)){

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

return (bool)(ifr.ifr_flags & IFF_UP);

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

if(not get_flags(interface, &ifr)){

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1269

1325

int notdotentries(const struct dirent *direntry){

1270

1326

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

1271

1327

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

1278

1334

}

1279

1335

1280

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1281

1338

int runnable_hook(const struct dirent *direntry){

1282

1339

int ret;

1283

1340

size_t sret;

1291

1348

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

1292

1349

"abcdefghijklmnopqrstuvwxyz"

1293

1350

"0123456789"

1294

"_-");

1351

"_.-");

1295

1352

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

1296

1353

/* Contains non-allowed characters */

1297

1354

if(debug){

1298

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

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1355

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

1356

direntry->d_name);

1301

1357

}

1302

1358

return 0;

1303

1359

}

1304

1360

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1361

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1313

1362

if(ret == -1){

1314

1363

if(debug){

1315

1364

perror_plus("Could not stat hook");

1319

1368

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

1320

1369

/* Not a regular file */

1321

1370

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1371

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

1372

direntry->d_name);

1325

1373

}

1326

1374

return 0;

1327

1375

}

1328

1376

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

1329

1377

/* Not executable */

1330

1378

if(debug){

1331

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

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1379

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

1380

direntry->d_name);

1334

1381

}

1335

1382

return 0;

1336

1383

}

1384

if(debug){

1385

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

1386

direntry->d_name);

1387

}

1337

1388

return 1;

1338

1389

}

1339

1390

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1341

1394

int ret;

1342

1395

struct timespec now;

1343

1396

struct timespec waited_time;

1344

1397

intmax_t block_time;

1345

1398

1346

1399

while(true){

1347

if(mc.current_server == NULL){

1348

if (debug){

1349

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

1350

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

1400

if(mc->current_server == NULL){

1401

if(debug){

1402

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

1403

" No timeout!\n");

1351

1404

}

1352

1405

ret = avahi_simple_poll_iterate(s, -1);

1353

1406

} else {

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1407

if(debug){

1408

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

1409

" it, or wait\n");

1358

1410

}

1359

1411

/* the current time */

1360

1412

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

1417

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

1366

1418

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

1367

1419

waited_time.tv_sec = (now.tv_sec

1368

- mc.current_server->last_seen.tv_sec);

1420

- mc->current_server->last_seen.tv_sec);

1369

1421

waited_time.tv_nsec = (now.tv_nsec

1370

- mc.current_server->last_seen.tv_nsec);

1422

- mc->current_server->last_seen.tv_nsec);

1371

1423

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

1372

1424

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

1373

1425

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

1375

1427

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

1376

1428

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

1377

1429

1378

if (debug){

1379

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

1380

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

1430

if(debug){

1431

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

1432

block_time);

1381

1433

}

1382

1434

1383

1435

if(block_time <= 0){

1384

ret = start_mandos_communication(mc.current_server->ip,

1385

mc.current_server->port,

1386

mc.current_server->if_index,

1387

mc.current_server->af);

1436

ret = start_mandos_communication(mc->current_server->ip,

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1388

1440

if(ret == 0){

1389

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1390

1442

return 0;

1391

1443

}

1392

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1393

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1394

1446

if(ret == -1){

1395

1447

perror_plus("clock_gettime");

1396

1448

return -1;

1397

1449

}

1398

mc.current_server = mc.current_server->next;

1450

mc->current_server = mc->current_server->next;

1399

1451

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

1400

1452

servers, but don't block */

1401

1453

}

1403

1455

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

1404

1456

}

1405

1457

if(ret != 0){

1406

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

1458

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

1407

1459

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

1408

1460

}

1409

1461

}

1410

1462

}

1411

1463

}

1412

1464

1465

/* Set effective uid to 0, return errno */

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

if(seteuid(0) == -1){

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

/* Set effective and real user ID to 0. Return errno. */

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

if(setuid(0) == -1){

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

/* Set effective user ID to unprivileged saved user ID */

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

if(seteuid(uid) == -1){

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

if(setuid(uid) == -1){

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1519

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

runnable_hook, alphasort);

1539

#else /* not __GLIBC_PREREQ(2, 15) */

1540

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

1541

alphasort);

1542

#endif /* not __GLIBC_PREREQ(2, 15) */

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

perror_plus("dup2(devnull, STDIN_FILENO)");

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1621

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1626

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

ret = setenv("CONNECT", connect_to, 1);

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1673

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1693

}

1694

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1699

int ret;

1700

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1702

if(if_index == 0){

1703

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

1704

errno = old_errno;

1705

return ENXIO;

1706

}

1707

1708

if(quit_now){

1709

errno = old_errno;

1710

return EINTR;

1711

}

1712

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

if(not get_flags(interface, &network)){

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

network.ifr_flags |= IFF_UP; /* set flag */

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1790

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1799

}

1800

} else if(debug){

1801

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1802

interface);

1803

}

1804

1805

/* Sleep checking until interface is running.

1806

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

1807

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

1808

if(interface_is_running(interface)){

1809

break;

1810

}

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1812

ret = nanosleep(&sleeptime, NULL);

1813

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

1814

perror_plus("nanosleep");

1815

}

1816

}

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1831

}

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

if(not get_flags(interface, &network) and debug){

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1878

if(ret == -1){

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1890

interface);

1891

}

1892

1893

errno = old_errno;

1894

return 0;

1895

}

1896

1413

1897

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

1898

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1899

.priority = "SECURE256:!CTYPE-X.509:"

1900

"+CTYPE-OPENPGP", .current_server = NULL,

1901

.interfaces = NULL, .interfaces_size = 0 };

1414

1902

AvahiSServiceBrowser *sb = NULL;

1415

int error;

1903

error_t ret_errno;

1416

1904

int ret;

1417

1905

intmax_t tmpmax;

1418

1906

char *tmp;

1419

1907

int exitcode = EXIT_SUCCESS;

1420

const char *interface = "";

1421

struct ifreq network;

1422

int sd = -1;

1423

bool take_down_interface = false;

1424

uid_t uid;

1425

gid_t gid;

1426

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

1427

bool tempdir_created = false;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1911

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

1912

char *tempdir = NULL;

1428

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1429

1914

const char *seckey = PATHDIR "/" SECKEY;

1430

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1431

1917

1432

1918

bool gnutls_initialized = false;

1433

1919

bool gpgme_initialized = false;

1495

1981

.group = 2 },

1496

1982

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

1497

1983

.arg = "SECONDS",

1498

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

1984

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

1499

1985

.group = 2 },

1500

1986

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

1501

1987

.arg = "DIR",

1524

2010

connect_to = arg;

1525

2011

break;

1526

2012

case 'i': /* --interface */

1527

interface = arg;

2013

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

argp_error(state, "%s", strerror(ret_errno));

2017

}

1528

2018

break;

1529

2019

case 's': /* --seckey */

1530

2020

seckey = arg;

1573

2063

argp_state_help(state, state->out_stream,

1574

2064

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1575

2065

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

1576

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

1577

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

2066

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

1578

2067

exit(argp_err_exit_status);

1579

2068

break;

1580

2069

default:

1607

2096

{

1608

2097

/* Work around Debian bug #633582:

1609

2098

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

1610

struct stat st;

1611

1612

/* Re-raise priviliges */

1613

errno = 0;

1614

ret = seteuid(0);

1615

if(ret == -1){

1616

perror_plus("seteuid");

1617

}

1618

1619

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

1620

int seckey_fd = open(seckey, O_RDONLY);

1621

if(seckey_fd == -1){

1622

perror_plus("open");

1623

} else {

1624

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

1625

if(ret == -1){

1626

perror_plus("fstat");

1627

} else {

1628

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

1629

ret = fchown(seckey_fd, uid, gid);

1630

if(ret == -1){

1631

perror_plus("fchown");

1632

}

1633

}

1634

}

1635

TEMP_FAILURE_RETRY(close(seckey_fd));

1636

}

1637

}

1638

1639

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

1640

int pubkey_fd = open(pubkey, O_RDONLY);

1641

if(pubkey_fd == -1){

1642

perror_plus("open");

1643

} else {

1644

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

1645

if(ret == -1){

1646

perror_plus("fstat");

1647

} else {

1648

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

1649

ret = fchown(pubkey_fd, uid, gid);

1650

if(ret == -1){

1651

perror_plus("fchown");

1652

}

1653

}

1654

}

1655

TEMP_FAILURE_RETRY(close(pubkey_fd));

1656

}

1657

}

1658

1659

/* Lower privileges */

1660

errno = 0;

1661

ret = seteuid(uid);

1662

if(ret == -1){

1663

perror_plus("seteuid");

1664

}

1665

}

1666

1667

/* Find network hooks and run them */

1668

{

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

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

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

2099

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

1675

2105

} else {

1676

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

1677

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

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

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

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

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

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

char *delaystring;

1707

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

1708

if(ret == -1){

1709

perror_plus("asprintf");

1710

exit(1);

1711

}

1712

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

1713

if(ret == -1){

1714

free(delaystring);

1715

perror_plus("setenv");

1716

exit(1);

1717

}

1718

free(delaystring);

1719

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

1720

perror_plus("execl");

1721

} else {

1722

int status;

1723

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

1724

perror_plus("waitpid");

1725

free(fullname);

1726

continue;

1727

}

1728

if(WIFEXITED(status)){

1729

if(WEXITSTATUS(status) != 0){

1730

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

1731

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

1732

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

1733

WEXITSTATUS(status));

1734

free(fullname);

1735

continue;

1736

}

1737

} else if(WIFSIGNALED(status)){

1738

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

1739

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

1740

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

1741

WTERMSIG(status));

1742

free(fullname);

1743

continue;

1744

} else {

1745

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

1746

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

1747

direntry->d_name);

1748

free(fullname);

1749

continue;

1750

}

1751

}

1752

free(fullname);

1753

if(quit_now){

1754

goto end;

1755

}

1756

}

1757

close(devnull);

1758

}

2106

struct stat st;

2107

2108

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

2109

int seckey_fd = open(seckey, O_RDONLY);

2110

if(seckey_fd == -1){

2111

perror_plus("open");

2112

} else {

2113

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

2114

if(ret == -1){

2115

perror_plus("fstat");

2116

} else {

2117

if(S_ISREG(st.st_mode)

2118

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

2119

ret = fchown(seckey_fd, uid, gid);

2120

if(ret == -1){

2121

perror_plus("fchown");

2122

}

2123

}

2124

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2126

}

2127

}

2128

2129

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

2130

int pubkey_fd = open(pubkey, O_RDONLY);

2131

if(pubkey_fd == -1){

2132

perror_plus("open");

2133

} else {

2134

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

2135

if(ret == -1){

2136

perror_plus("fstat");

2137

} else {

2138

if(S_ISREG(st.st_mode)

2139

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

2140

ret = fchown(pubkey_fd, uid, gid);

2141

if(ret == -1){

2142

perror_plus("fchown");

2143

}

2144

}

2145

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2150

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

/* Remove invalid interface names (except "none") */

2160

{

2161

char *interface = NULL;

2162

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2171

interface = NULL;

2172

}

2173

}

2174

}

2175

2176

/* Run network hooks */

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2185

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

1759

2189

}

1760

2190

1761

2191

if(not debug){

1762

2192

avahi_set_log_function(empty_log);

1763

2193

}

1764

2194

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

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

1782

}

1783

if(interface == NULL){

1784

perror_plus("malloc");

1785

free(direntries);

1786

exitcode = EXIT_FAILURE;

1787

goto end;

1788

}

1789

free(direntries);

1790

} else {

1791

free(direntries);

1792

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

1793

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

1794

exitcode = EXIT_FAILURE;

1795

goto end;

1796

}

1797

}

1798

1799

2195

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

1800

2196

from the signal handler */

1801

2197

/* Initialize the pseudo-RNG for Avahi */

1802

2198

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

1803

mc.simple_poll = avahi_simple_poll_new();

1804

if(mc.simple_poll == NULL){

1805

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

1806

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

2201

fprintf_plus(stderr,

2202

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

1807

2203

exitcode = EX_UNAVAILABLE;

1808

2204

goto end;

1809

2205

}

1871

2267

}

1872

2268

}

1873

2269

1874

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

1875

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

1876

if_index = (AvahiIfIndex) if_nametoindex(interface);

1877

if(if_index == 0){

1878

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

1879

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

1880

exitcode = EX_UNAVAILABLE;

1881

goto end;

1882

}

1883

1884

if(quit_now){

1885

goto end;

1886

}

1887

1888

/* Re-raise priviliges */

1889

errno = 0;

1890

ret = seteuid(0);

1891

if(ret == -1){

1892

perror_plus("seteuid");

1893

}

1894

1895

#ifdef __linux__

1896

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1897

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

1898

ret = klogctl(8, NULL, 5);

1899

bool restore_loglevel = true;

1900

if(ret == -1){

1901

restore_loglevel = false;

1902

perror_plus("klogctl");

1903

}

1904

#endif /* __linux__ */

1905

1906

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1907

if(sd < 0){

1908

perror_plus("socket");

1909

exitcode = EX_OSERR;

1910

#ifdef __linux__

1911

if(restore_loglevel){

1912

ret = klogctl(7, NULL, 0);

1913

if(ret == -1){

1914

perror_plus("klogctl");

1915

}

1916

}

1917

#endif /* __linux__ */

1918

/* Lower privileges */

1919

errno = 0;

1920

ret = seteuid(uid);

1921

if(ret == -1){

1922

perror_plus("seteuid");

1923

}

1924

goto end;

1925

}

1926

strcpy(network.ifr_name, interface);

1927

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

1928

if(ret == -1){

1929

perror_plus("ioctl SIOCGIFFLAGS");

1930

#ifdef __linux__

1931

if(restore_loglevel){

1932

ret = klogctl(7, NULL, 0);

1933

if(ret == -1){

1934

perror_plus("klogctl");

1935

}

1936

}

1937

#endif /* __linux__ */

1938

exitcode = EX_OSERR;

1939

/* Lower privileges */

1940

errno = 0;

1941

ret = seteuid(uid);

1942

if(ret == -1){

1943

perror_plus("seteuid");

1944

}

1945

goto end;

1946

}

1947

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

1948

network.ifr_flags |= IFF_UP;

1949

take_down_interface = true;

1950

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

1951

if(ret == -1){

1952

take_down_interface = false;

1953

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1954

exitcode = EX_OSERR;

1955

#ifdef __linux__

1956

if(restore_loglevel){

1957

ret = klogctl(7, NULL, 0);

1958

if(ret == -1){

1959

perror_plus("klogctl");

2270

/* If no interfaces were specified, make a list */

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

2294

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

/* Bring up interfaces which are down, and remove any "none"s */

2305

{

2306

char *interface = NULL;

2307

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2308

interface))){

2309

/* If interface name is "none", stop bringing up interfaces.

2310

Also remove all instances of "none" from the list */

2311

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

2312

argz_delete(&mc.interfaces, &mc.interfaces_size,

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

argz_delete(&mc.interfaces, &mc.interfaces_size,

2319

interface);

2320

interface = NULL;

1960

2321

}

1961

2322

}

1962

#endif /* __linux__ */

1963

/* Lower privileges */

1964

errno = 0;

1965

ret = seteuid(uid);

1966

if(ret == -1){

1967

perror_plus("seteuid");

1968

}

1969

goto end;

1970

}

1971

}

1972

/* Sleep checking until interface is running.

1973

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

1974

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

1975

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

1976

if(ret == -1){

1977

perror_plus("ioctl SIOCGIFFLAGS");

1978

} else if(network.ifr_flags & IFF_RUNNING){

1979

2323

break;

1980

2324

}

1981

struct timespec sleeptime = { .tv_nsec = 250000000 };

1982

ret = nanosleep(&sleeptime, NULL);

1983

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

1984

perror_plus("nanosleep");

1985

}

1986

}

1987

if(not take_down_interface){

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("close");

1992

}

1993

}

1994

#ifdef __linux__

1995

if(restore_loglevel){

1996

/* Restores kernel loglevel to default */

1997

ret = klogctl(7, NULL, 0);

1998

if(ret == -1){

1999

perror_plus("klogctl");

2000

}

2001

}

2002

#endif /* __linux__ */

2003

/* Lower privileges */

2004

errno = 0;

2005

if(take_down_interface){

2006

/* Lower privileges */

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2010

}

2011

} else {

2012

/* Lower privileges permanently */

2013

ret = setuid(uid);

2014

if(ret == -1){

2015

perror_plus("setuid");

2016

}

2017

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

if(debug and (interfaces_to_take_down == NULL)){

2341

fprintf_plus(stderr, "No interfaces were brought up\n");

2342

}

2343

}

2344

2345

/* If we only got one interface, explicitly use only that one */

2346

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2347

if(debug){

2348

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2349

mc.interfaces);

2350

}

2351

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2018

2352

}

2019

2353

2020

2354

if(quit_now){

2021

2355

goto end;

2022

2356

}

2023

2357

2024

ret = init_gnutls_global(pubkey, seckey);

2358

ret = init_gnutls_global(pubkey, seckey, &mc);

2025

2359

if(ret == -1){

2026

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

2027

"init_gnutls_global failed\n");

2360

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

2028

2361

exitcode = EX_UNAVAILABLE;

2029

2362

goto end;

2030

2363

} else {

2035

2368

goto end;

2036

2369

}

2037

2370

2038

if(mkdtemp(tempdir) == NULL){

2371

/* Try /run/tmp before /tmp */

2372

tempdir = mkdtemp(run_tempdir);

2373

if(tempdir == NULL and errno == ENOENT){

2374

if(debug){

2375

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2039

2381

perror_plus("mkdtemp");

2040

2382

goto end;

2041

2383

}

2042

tempdir_created = true;

2043

2384

2044

2385

if(quit_now){

2045

2386

goto end;

2046

2387

}

2047

2388

2048

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

2049

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

2050

"init_gpgme failed\n");

2389

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

2390

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

2051

2391

exitcode = EX_UNAVAILABLE;

2052

2392

goto end;

2053

2393

} else {

2062

2402

/* Connect directly, do not use Zeroconf */

2063

2403

/* (Mainly meant for debugging) */

2064

2404

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

2405

2065

2406

if(address == NULL){

2066

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

2067

"No colon in address\n");

2407

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

2068

2408

exitcode = EX_USAGE;

2069

2409

goto end;

2070

2410

}

2073

2413

goto end;

2074

2414

}

2075

2415

2076

uint16_t port;

2416

in_port_t port;

2077

2417

errno = 0;

2078

2418

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

2079

2419

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

2080

or tmpmax != (uint16_t)tmpmax){

2081

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

2082

"Bad port number\n");

2420

or tmpmax != (in_port_t)tmpmax){

2421

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

2083

2422

exitcode = EX_USAGE;

2084

2423

goto end;

2085

2424

}

2086

2425

2087

2426

if(quit_now){

2088

2427

goto end;

2089

2428

}

2090

2429

2091

port = (uint16_t)tmpmax;

2430

port = (in_port_t)tmpmax;

2092

2431

*address = '\0';

2093

2432

/* Colon in address indicates IPv6 */

2094

2433

int af;

2110

2449

}

2111

2450

2112

2451

while(not quit_now){

2113

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

2452

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

2453

&mc);

2114

2454

if(quit_now or ret == 0){

2115

2455

break;

2116

2456

}

2117

2457

if(debug){

2118

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

2119

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

2458

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

2459

(int)retry_interval);

2120

2460

}

2121

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2122

2462

}

2123

2463

2124

if (not quit_now){

2464

if(not quit_now){

2125

2465

exitcode = EXIT_SUCCESS;

2126

2466

}

2127

2467

2142

2482

config.publish_domain = 0;

2143

2483

2144

2484

/* Allocate a new server */

2145

mc.server = avahi_server_new(avahi_simple_poll_get

2146

(mc.simple_poll), &config, NULL,

2147

NULL, &error);

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2148

2487

2149

2488

/* Free the Avahi configuration data */

2150

2489

avahi_server_config_free(&config);

2152

2491

2153

2492

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

2154

2493

if(mc.server == NULL){

2155

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

2156

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

2157

avahi_strerror(error));

2494

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

2495

avahi_strerror(ret_errno));

2158

2496

exitcode = EX_UNAVAILABLE;

2159

2497

goto end;

2160

2498

}

2166

2504

/* Create the Avahi service browser */

2167

2505

sb = avahi_s_service_browser_new(mc.server, if_index,

2168

2506

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2169

NULL, 0, browse_callback, NULL);

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2170

2509

if(sb == NULL){

2171

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

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2510

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

2511

avahi_strerror(avahi_server_errno(mc.server)));

2174

2512

exitcode = EX_UNAVAILABLE;

2175

2513

goto end;

2176

2514

}

2182

2520

/* Run the main loop */

2183

2521

2184

2522

if(debug){

2185

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

2186

"Starting Avahi loop search\n");

2523

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

2187

2524

}

2188

2189

ret = avahi_loop_with_timeout(mc.simple_poll,

2190

(int)(retry_interval * 1000));

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

(int)(retry_interval * 1000), &mc);

2191

2528

if(debug){

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

2194

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

2529

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

2530

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

2195

2531

}

2196

2532

2197

2533

end:

2198

2534

2199

2535

if(debug){

2200

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

2201

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

2536

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

2202

2537

}

2203

2538

2204

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

2205

2542

if(sb != NULL)

2206

2543

avahi_s_service_browser_free(sb);

2207

2544

2208

2545

if(mc.server != NULL)

2209

2546

avahi_server_free(mc.server);

2210

2547

2211

if(mc.simple_poll != NULL)

2212

avahi_simple_poll_free(mc.simple_poll);

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2213

2550

2214

2551

if(gnutls_initialized){

2215

2552

gnutls_certificate_free_credentials(mc.cred);

2220

2557

if(gpgme_initialized){

2221

2558

gpgme_release(mc.ctx);

2222

2559

}

2223

2560

2224

2561

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

2225

2562

has seen */

2226

2563

if(mc.current_server != NULL){

2227

2564

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

2228

2565

while(mc.current_server != NULL){

2229

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

free((char *)(mc.current_server->ip));

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2230

2575

free(mc.current_server);

2231

2576

mc.current_server = next;

2232

2577

}

2233

2578

}

2234

2579

2235

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

2236

2237

/* Take down the network interface */

2238

if(take_down_interface){

2239

/* Re-raise priviliges */

2240

errno = 0;

2241

ret = seteuid(0);

2242

if(ret == -1){

2243

perror_plus("seteuid");

2580

/* Re-raise privileges */

2581

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

/* Take down the network interfaces which were brought up */

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

if(debug and (interfaces_to_take_down == NULL)){

2605

fprintf_plus(stderr, "No interfaces needed to be taken"

2606

" down\n");

2607

}

2608

}

2244

2609

}

2245

if(geteuid() == 0){

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCGIFFLAGS");

2249

} else if(network.ifr_flags & IFF_UP){

2250

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

2251

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

2252

if(ret == -1){

2253

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2254

}

2255

}

2256

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

2257

if(ret == -1){

2258

perror_plus("close");

2259

}

2260

/* Lower privileges permanently */

2261

errno = 0;

2262

ret = setuid(uid);

2263

if(ret == -1){

2264

perror_plus("setuid");

2265

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2266

2615

}

2267

2616

}

2268

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2620

2269

2621

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

2270

if(tempdir_created){

2622

if(tempdir != NULL){

2271

2623

struct dirent **direntries = NULL;

2272

struct dirent *direntry = NULL;

2273

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

2274

alphasort);

2275

if (numentries > 0){

2276

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

2277

direntry = direntries[i];

2278

char *fullname = NULL;

2279

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

2280

direntry->d_name);

2281

if(ret < 0){

2282

perror_plus("asprintf");

2283

continue;

2284

}

2285

ret = remove(fullname);

2286

if(ret == -1){

2287

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

2288

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

2289

}

2290

free(fullname);

2624

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

int numentries = scandirat(tempdir_fd, ".", &direntries,

2632

notdotentries, alphasort);

2633

#else /* not __GLIBC_PREREQ(2, 15) */

2634

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

2635

alphasort);

2636

#endif /* not __GLIBC_PREREQ(2, 15) */

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2644

if(ret == -1){

2645

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2646

" \"%s\", 0): %s\n", tempdir,

2647

direntries[i]->d_name, strerror(errno));

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2291

2661

}

2292

}

2293

2294

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

2295

free(direntries);

2296

if (numentries == -1){

2297

perror_plus("scandir");

2298

}

2299

ret = rmdir(tempdir);

2300

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

2301

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2302

2663

}

2303

2664

}

2304

2665