/mandos/release : revision 237.7.152

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

41

42

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

43

stdout, ferror(), remove() */

44

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

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() */

61

*/

62

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

63

strtoimax() */

64

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

65

64

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

66

65

program_invocation_short_name */

67

66

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

73

72

*/

74

73

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

75

74

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

76

setgid(), pause() */

75

setgid(), pause(), _exit() */

77

76

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

78

77

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

79

78

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

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

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

88

WEXITSTATUS(), WTERMSIG() */

89

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

90

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

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

88

94

89

95

#ifdef __linux__

90

96

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

108

114

init_gnutls_session(),

109

115

GNUTLS_* */

110

116

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

117

/* gnutls_certificate_set_openpgp_key_file(),

118

GNUTLS_OPENPGP_FMT_BASE64 */

113

119

114

120

/* GPGME */

115

121

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

131

137

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

132

138

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

133

139

char *connect_to = NULL;

140

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

134

143

135

144

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

136

145

typedef struct server{

137

146

const char *ip;

138

uint16_t port;

147

in_port_t port;

139

148

AvahiIfIndex if_index;

140

149

int af;

141

150

struct timespec last_seen;

145

154

146

155

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

147

156

typedef struct {

148

AvahiSimplePoll *simple_poll;

149

157

AvahiServer *server;

150

158

gnutls_certificate_credentials_t cred;

151

159

unsigned int dh_bits;

153

161

const char *priority;

154

162

gpgme_ctx_t ctx;

155

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

156

166

} mandos_context;

157

167

158

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

159

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

160

.dh_bits = 1024, .priority = "SECURE256"

161

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

162

.current_server = NULL };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

163

170

164

171

sig_atomic_t quit_now = 0;

165

172

int signal_received = 0;

166

173

167

174

/* Function to use when printing errors */

168

175

void perror_plus(const char *print_text){

176

int e = errno;

169

177

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

170

178

program_invocation_short_name);

179

errno = e;

171

180

perror(print_text);

172

181

}

173

182

183

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

184

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

185

va_list ap;

186

va_start (ap, format);

187

188

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

189

program_invocation_short_name));

190

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

191

}

192

174

193

/*

175

194

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

176

195

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

177

196

* "buffer_length" is how much is already used.

178

197

*/

179

198

size_t incbuffer(char **buffer, size_t buffer_length,

180

size_t buffer_capacity){

199

size_t buffer_capacity){

181

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

201

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

183

202

if(buffer == NULL){

189

208

}

190

209

191

210

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

211

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

212

int af, server **current_server){

195

213

int ret;

196

214

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

197

215

if(new_server == NULL){

198

216

perror_plus("malloc");

199

return -1;

217

return false;

200

218

}

201

219

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

220

.port = port,

221

.if_index = if_index,

222

.af = af };

205

223

if(new_server->ip == NULL){

206

224

perror_plus("strdup");

207

return -1;

225

return false;

208

226

}

209

227

/* Special case of first server */

210

if (mc.current_server == NULL){

228

if(*current_server == NULL){

211

229

new_server->next = new_server;

212

230

new_server->prev = new_server;

213

mc.current_server = new_server;

231

*current_server = new_server;

214

232

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

215

233

} else {

216

new_server->next = mc.current_server;

217

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

234

new_server->next = *current_server;

235

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

218

236

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

220

238

}

221

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

239

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

222

240

if(ret == -1){

223

241

perror_plus("clock_gettime");

224

return -1;

242

return false;

225

243

}

226

return 0;

244

return true;

227

245

}

228

246

229

247

/*

230

248

* Initialize GPGME.

231

249

*/

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

250

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

251

const char *tempdir, mandos_context *mc){

234

252

gpgme_error_t rc;

235

253

gpgme_engine_info_t engine_info;

236

254

237

238

255

/*

239

256

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

240

257

*/

251

268

252

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

270

if(rc != GPG_ERR_NO_ERROR){

254

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

255

gpgme_strsource(rc), gpgme_strerror(rc));

271

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

272

gpgme_strsource(rc), gpgme_strerror(rc));

256

273

return false;

257

274

}

258

275

259

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

260

277

if(rc != GPG_ERR_NO_ERROR){

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

263

280

return false;

264

281

}

265

282

272

289

}

273

290

274

291

if(debug){

275

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

292

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

276

293

}

277

294

278

295

/* Init GPGME */

279

296

gpgme_check_version(NULL);

280

297

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

298

if(rc != GPG_ERR_NO_ERROR){

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

284

301

return false;

285

302

}

286

303

287

304

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

288

305

rc = gpgme_get_engine_info(&engine_info);

289

306

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

292

309

return false;

293

310

}

294

311

while(engine_info != NULL){

300

317

engine_info = engine_info->next;

301

318

}

302

319

if(engine_info == NULL){

303

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

320

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

321

tempdir);

304

322

return false;

305

323

}

306

324

307

325

/* Create new GPGME "context" */

308

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

326

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

309

327

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

312

331

return false;

313

332

}

314

333

325

344

*/

326

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

327

346

size_t crypto_size,

328

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

329

349

gpgme_data_t dh_crypto, dh_plain;

330

350

gpgme_error_t rc;

331

351

ssize_t ret;

333

353

ssize_t plaintext_length = 0;

334

354

335

355

if(debug){

336

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

356

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

337

357

}

338

358

339

359

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

340

360

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

361

0);

342

362

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

345

365

return -1;

346

366

}

347

367

348

368

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

349

369

rc = gpgme_data_new(&dh_plain);

350

370

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

353

374

gpgme_data_release(dh_crypto);

354

375

return -1;

355

376

}

356

377

357

378

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

358

379

data buffer */

359

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

380

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

360

381

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

363

384

plaintext_length = -1;

364

385

if(debug){

365

386

gpgme_decrypt_result_t result;

366

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

367

388

if(result == NULL){

368

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

389

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

369

390

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

374

395

if(result->file_name != NULL){

375

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

396

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

376

397

}

377

398

gpgme_recipient_t recipient;

378

399

recipient = result->recipients;

379

400

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

386

408

recipient = recipient->next;

387

409

}

388

410

}

391

413

}

392

414

393

415

if(debug){

394

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

416

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

395

417

}

396

418

397

419

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

404

426

*plaintext = NULL;

405

427

while(true){

406

428

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

409

431

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

413

435

}

414

436

415

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

450

}

429

451

430

452

if(debug){

431

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

453

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

432

454

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

433

455

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

434

456

}

446

468

}

447

469

448

470

static const char * safer_gnutls_strerror(int value){

449

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

450

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

451

472

if(ret == NULL)

452

473

ret = "(unknown)";

453

474

return ret;

456

477

/* GnuTLS log function callback */

457

478

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

458

479

const char* string){

459

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

480

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

460

481

}

461

482

462

483

static int init_gnutls_global(const char *pubkeyfilename,

463

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

464

486

int ret;

465

487

466

488

if(debug){

467

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

489

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

468

490

}

469

491

470

492

ret = gnutls_global_init();

471

493

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

474

496

return -1;

475

497

}

476

498

483

505

}

484

506

485

507

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

487

509

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

490

512

gnutls_global_deinit();

491

513

return -1;

492

514

}

493

515

494

516

if(debug){

495

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

496

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

497

seckeyfilename);

517

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

518

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

519

pubkeyfilename,

520

seckeyfilename);

498

521

}

499

522

500

523

ret = gnutls_certificate_set_openpgp_key_file

501

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

502

525

GNUTLS_OPENPGP_FMT_BASE64);

503

526

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

509

532

goto globalfail;

510

533

}

511

534

512

535

/* GnuTLS server initialization */

513

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

514

537

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

517

541

goto globalfail;

518

542

}

519

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

543

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

520

544

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

523

547

goto globalfail;

524

548

}

525

549

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

527

551

528

552

return 0;

529

553

530

554

globalfail:

531

555

532

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

533

557

gnutls_global_deinit();

534

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

535

559

return -1;

536

560

}

537

561

538

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

539

564

int ret;

540

565

/* GnuTLS session creation */

541

566

do {

545

570

}

546

571

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

547

572

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

550

576

}

551

577

552

578

{

553

579

const char *err;

554

580

do {

555

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

581

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

556

582

if(quit_now){

557

583

gnutls_deinit(*session);

558

584

return -1;

559

585

}

560

586

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

561

587

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

565

591

gnutls_deinit(*session);

566

592

return -1;

567

593

}

569

595

570

596

do {

571

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

598

mc->cred);

573

599

if(quit_now){

574

600

gnutls_deinit(*session);

575

601

return -1;

576

602

}

577

603

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

578

604

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

581

607

gnutls_deinit(*session);

582

608

return -1;

583

609

}

585

611

/* ignore client certificate if any. */

586

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

587

613

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

589

615

590

616

return 0;

591

617

}

595

621

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

596

622

597

623

/* Called when a Mandos server is found */

598

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

624

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

599

625

AvahiIfIndex if_index,

600

int af){

626

int af, mandos_context *mc){

601

627

int ret, tcp_sd = -1;

602

628

ssize_t sret;

603

629

union {

628

654

pf = PF_INET;

629

655

break;

630

656

default:

631

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

657

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

632

658

errno = EINVAL;

633

659

return -1;

634

660

}

635

661

636

ret = init_gnutls_session(&session);

662

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

663

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

664

bool match = false;

665

{

666

char *interface = NULL;

667

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

668

interface))){

669

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

670

match = true;

671

break;

672

}

673

}

674

}

675

if(not match){

676

if(debug){

677

char interface[IF_NAMESIZE];

678

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

679

perror_plus("if_indextoname");

680

} else {

681

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

682

" \"%s\"\n",

683

if_indextoname((unsigned int)if_index,

684

interface));

685

}

686

}

687

return -1;

688

}

689

}

690

691

ret = init_gnutls_session(&session, mc);

637

692

if(ret != 0){

638

693

return -1;

639

694

}

640

695

641

696

if(debug){

642

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

643

"\n", ip, port);

697

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

698

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

644

699

}

645

700

646

701

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

727

}

673

728

if(ret == 0){

674

729

int e = errno;

675

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

730

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

676

731

errno = e;

677

732

goto mandos_end;

678

733

}

679

734

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

735

to.in6.sin6_port = htons(port);

684

736

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

737

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

686

-Wunreachable-code*/

738

-Wunreachable-code*/

687

739

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

740

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

741

" incomplete without a network interface\n");

690

742

errno = EINVAL;

691

743

goto mandos_end;

692

744

}

710

762

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

711

763

perror_plus("if_indextoname");

712

764

} else {

713

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

714

ip, interface, port);

765

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

766

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

715

767

}

716

768

} else {

717

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

718

port);

769

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

770

ip, (uintmax_t)port);

719

771

}

720

772

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

773

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

783

perror_plus("inet_ntop");

732

784

} else {

733

785

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

734

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

786

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

735

787

}

736

788

}

737

789

}

765

817

while(true){

766

818

size_t out_size = strlen(out);

767

819

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

768

out_size - written));

820

out_size - written));

769

821

if(ret == -1){

770

822

int e = errno;

771

823

perror_plus("write");

791

843

}

792

844

793

845

if(debug){

794

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

846

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

795

847

}

796

848

797

849

if(quit_now){

799

851

goto mandos_end;

800

852

}

801

853

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

854

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

855

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

856

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

857

gnutls_transport_set_ptr(session,

858

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

859

805

860

if(quit_now){

806

861

errno = EINTR;

817

872

818

873

if(ret != GNUTLS_E_SUCCESS){

819

874

if(debug){

820

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

875

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

821

876

gnutls_perror(ret);

822

877

}

823

878

errno = EPROTO;

827

882

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

828

883

829

884

if(debug){

830

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

831

ip);

885

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

886

" %s\n", ip);

832

887

}

833

888

834

889

while(true){

839

894

}

840

895

841

896

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

897

buffer_capacity);

843

898

if(buffer_capacity == 0){

844

899

int e = errno;

845

900

perror_plus("incbuffer");

872

927

}

873

928

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

874

929

if(ret < 0){

875

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

930

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

931

"***\n");

876

932

gnutls_perror(ret);

877

933

errno = EPROTO;

878

934

goto mandos_end;

879

935

}

880

936

break;

881

937

default:

882

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

883

" encrypted session with Mandos server\n");

938

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

939

" encrypted session with Mandos server\n");

884

940

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

941

errno = EIO;

886

942

goto mandos_end;

891

947

}

892

948

893

949

if(debug){

894

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

950

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

895

951

}

896

952

897

953

if(quit_now){

909

965

910

966

if(buffer_length > 0){

911

967

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

968

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

969

&decrypted_buffer, mc);

915

970

if(decrypted_buffer_size >= 0){

916

971

917

972

written = 0;

927

982

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

928

983

int e = errno;

929

984

if(debug){

930

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

931

strerror(errno));

985

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

986

strerror(errno));

932

987

}

933

988

errno = e;

934

989

goto mandos_end;

978

1033

AVAHI_GCC_UNUSED AvahiStringList *txt,

979

1034

AVAHI_GCC_UNUSED AvahiLookupResultFlags

980

1035

flags,

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1036

void* mc){

1037

if(r == NULL){

1038

return;

1039

}

983

1040

984

1041

/* Called whenever a service has been resolved successfully or

985

1042

timed out */

991

1048

switch(event){

992

1049

default:

993

1050

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1051

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

1052

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

1053

domain,

1054

avahi_strerror(avahi_server_errno

1055

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

997

1056

break;

998

1057

999

1058

case AVAHI_RESOLVER_FOUND:

1001

1060

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1061

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

1003

1062

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1063

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

1064

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

1065

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

1007

1066

}

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1067

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

1068

interface,

1069

avahi_proto_to_af(proto),

1070

mc);

1010

1071

if(ret == 0){

1011

avahi_simple_poll_quit(mc.simple_poll);

1072

avahi_simple_poll_quit(simple_poll);

1012

1073

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1074

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

1075

avahi_proto_to_af(proto),

1076

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

1077

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

1078

" list\n", name);

1079

}

1015

1080

}

1016

1081

}

1017

1082

}

1027

1092

const char *domain,

1028

1093

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1029

1094

flags,

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1095

void* mc){

1096

if(b == NULL){

1097

return;

1098

}

1032

1099

1033

1100

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

1034

1101

is removed from the LAN */

1041

1108

default:

1042

1109

case AVAHI_BROWSER_FAILURE:

1043

1110

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1111

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

1112

avahi_strerror(avahi_server_errno

1113

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

1114

avahi_simple_poll_quit(simple_poll);

1047

1115

return;

1048

1116

1049

1117

case AVAHI_BROWSER_NEW:

1052

1120

the callback function is called the Avahi server will free the

1053

1121

resolver for us. */

1054

1122

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

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

1059

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

1123

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

1124

interface, protocol, name, type,

1125

domain, protocol, 0,

1126

resolve_callback, mc) == NULL)

1127

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

1128

" %s\n", name,

1129

avahi_strerror(avahi_server_errno

1130

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

1060

1131

break;

1061

1132

1062

1133

case AVAHI_BROWSER_REMOVE:

1065

1136

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1137

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1138

if(debug){

1068

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

1139

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

1140

" searching...\n");

1069

1141

}

1070

1142

break;

1071

1143

}

1080

1152

signal_received = sig;

1081

1153

int old_errno = errno;

1082

1154

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1155

if(simple_poll != NULL){

1156

avahi_simple_poll_quit(simple_poll);

1085

1157

}

1086

1158

errno = old_errno;

1087

1159

}

1088

1160

1089

1161

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

1090

1162

int ret;

1163

error_t ret_errno;

1091

1164

1092

1165

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

1093

1166

if(s < 0){

1167

ret_errno = errno;

1094

1168

perror_plus("socket");

1169

errno = ret_errno;

1095

1170

return false;

1096

1171

}

1097

1172

strcpy(ifr->ifr_name, ifname);

1098

1173

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1174

if(ret == -1){

1100

1175

if(debug){

1176

ret_errno = errno;

1101

1177

perror_plus("ioctl SIOCGIFFLAGS");

1178

errno = ret_errno;

1102

1179

}

1103

1180

return false;

1104

1181

}

1110

1187

/* Reject the loopback device */

1111

1188

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1189

if(debug){

1113

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

1114

ifname);

1190

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

1191

ifname);

1115

1192

}

1116

1193

return false;

1117

1194

}

1118

1195

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

1119

1196

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

1120

1197

if(debug){

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1122

ifname);

1198

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

1199

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

1123

1200

}

1124

1201

return true;

1125

1202

}

1126

1203

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

1127

1204

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

1128

1205

if(debug){

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1130

ifname);

1206

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1207

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

1131

1208

}

1132

1209

return false;

1133

1210

}

1134

1211

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

1135

1212

if(ifr->ifr_flags & IFF_NOARP){

1136

1213

if(debug){

1137

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

1214

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

1215

ifname);

1138

1216

}

1139

1217

return false;

1140

1218

}

1141

1219

1142

1220

/* Accept this device */

1143

1221

if(debug){

1144

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

1222

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

1145

1223

}

1146

1224

return true;

1147

1225

}

1159

1237

struct ifreq ifr;

1160

1238

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

1161

1239

if(debug){

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1240

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

1241

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

1242

}

1243

return 0;

1244

}

1245

1246

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

1247

return 0;

1248

}

1249

return 1;

1250

}

1251

1252

/*

1253

* This function determines if a network interface is up.

1254

*/

1255

bool interface_is_up(const char *interface){

1256

struct ifreq ifr;

1257

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

1258

if(debug){

1259

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

1260

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

1261

}

1262

return false;

1263

}

1264

1265

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

1266

}

1267

1268

/*

1269

* This function determines if a network interface is running

1270

*/

1271

bool interface_is_running(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1215

1282

}

1216

1283

1217

1284

int notdotentries(const struct dirent *direntry){

1228

1295

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

1229

1296

int runnable_hook(const struct dirent *direntry){

1230

1297

int ret;

1298

size_t sret;

1231

1299

struct stat st;

1232

1300

1233

1301

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

1235

1303

return 0;

1236

1304

}

1237

1305

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1306

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

1307

"abcdefghijklmnopqrstuvwxyz"

1308

"0123456789"

1309

"_-");

1310

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

1311

/* Contains non-allowed characters */

1312

if(debug){

1313

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

1314

direntry->d_name);

1315

}

1316

return 0;

1317

}

1318

1319

char *fullname = NULL;

1320

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

1321

if(ret < 0){

1322

perror_plus("asprintf");

1323

return 0;

1324

}

1325

1326

ret = stat(fullname, &st);

1255

1327

if(ret == -1){

1256

1328

if(debug){

1257

perror_plus("Could not stat plugin");

1329

perror_plus("Could not stat hook");

1258

1330

}

1259

1331

return 0;

1260

1332

}

1261

1333

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

1262

1334

/* Not a regular file */

1335

if(debug){

1336

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

1337

direntry->d_name);

1338

}

1263

1339

return 0;

1264

1340

}

1265

1341

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

1266

1342

/* Not executable */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1267

1347

return 0;

1268

1348

}

1349

if(debug){

1350

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

1351

direntry->d_name);

1352

}

1269

1353

return 1;

1270

1354

}

1271

1355

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1356

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1357

mandos_context *mc){

1273

1358

int ret;

1274

1359

struct timespec now;

1275

1360

struct timespec waited_time;

1276

1361

intmax_t block_time;

1277

1362

1278

1363

while(true){

1279

if(mc.current_server == NULL){

1364

if(mc->current_server == NULL){

1280

1365

if (debug){

1281

fprintf(stderr,

1282

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

1366

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

1367

" No timeout!\n");

1283

1368

}

1284

1369

ret = avahi_simple_poll_iterate(s, -1);

1285

1370

} else {

1286

1371

if (debug){

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1372

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

1373

" it, or wait\n");

1289

1374

}

1290

1375

/* the current time */

1291

1376

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1296

1381

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

1297

1382

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

1298

1383

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1384

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

1300

1385

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1386

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

1302

1387

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

1303

1388

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

1304

1389

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

1307

1392

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

1308

1393

1309

1394

if (debug){

1310

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

1395

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

1396

block_time);

1311

1397

}

1312

1398

1313

1399

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1400

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

1401

mc->current_server->port,

1402

mc->current_server->if_index,

1403

mc->current_server->af, mc);

1318

1404

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1405

avahi_simple_poll_quit(s);

1320

1406

return 0;

1321

1407

}

1322

1408

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1409

&mc->current_server->last_seen);

1324

1410

if(ret == -1){

1325

1411

perror_plus("clock_gettime");

1326

1412

return -1;

1327

1413

}

1328

mc.current_server = mc.current_server->next;

1414

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

1329

1415

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

1330

1416

servers, but don't block */

1331

1417

}

1333

1419

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

1334

1420

}

1335

1421

if(ret != 0){

1336

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

1422

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

1337

1423

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

1338

1424

}

1339

1425

}

1340

1426

}

1341

1427

}

1342

1428

1429

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

1430

error_t raise_privileges(void){

1431

error_t old_errno = errno;

1432

error_t ret_errno = 0;

1433

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

1434

ret_errno = errno;

1435

perror_plus("seteuid");

1436

}

1437

errno = old_errno;

1438

return ret_errno;

1439

}

1440

1441

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

1442

error_t raise_privileges_permanently(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = raise_privileges();

1445

if(ret_errno != 0){

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t lower_privileges(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = 0;

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

/* Lower privileges permanently */

1470

error_t lower_privileges_permanently(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("setuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

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

1482

const float delay){

1483

struct dirent **direntries;

1484

struct dirent *direntry;

1485

int ret;

1486

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

1487

alphasort);

1488

if(numhooks == -1){

1489

if(errno == ENOENT){

1490

if(debug){

1491

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

1492

" found\n", hookdir);

1493

}

1494

} else {

1495

perror_plus("scandir");

1496

}

1497

} else {

1498

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

1499

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

1500

direntry = direntries[i];

1501

char *fullname = NULL;

1502

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

1503

if(ret < 0){

1504

perror_plus("asprintf");

1505

continue;

1506

}

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

pid_t hook_pid = fork();

1512

if(hook_pid == 0){

1513

/* Child */

1514

/* Raise privileges */

1515

raise_privileges_permanently();

1516

/* Set group */

1517

errno = 0;

1518

ret = setgid(0);

1519

if(ret == -1){

1520

perror_plus("setgid");

1521

}

1522

/* Reset supplementary groups */

1523

errno = 0;

1524

ret = setgroups(0, NULL);

1525

if(ret == -1){

1526

perror_plus("setgroups");

1527

}

1528

dup2(devnull, STDIN_FILENO);

1529

close(devnull);

1530

dup2(STDERR_FILENO, STDOUT_FILENO);

1531

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

1532

if(ret == -1){

1533

perror_plus("setenv");

1534

_exit(EX_OSERR);

1535

}

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

char *delaystring;

1552

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

1553

if(ret == -1){

1554

perror_plus("asprintf");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

free(delaystring);

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

free(delaystring);

1564

if(connect_to != NULL){

1565

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

1566

if(ret == -1){

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

}

1571

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1572

perror_plus("execl");

1573

_exit(EXIT_FAILURE);

1574

}

1575

} else {

1576

int status;

1577

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

1578

perror_plus("waitpid");

1579

free(fullname);

1580

continue;

1581

}

1582

if(WIFEXITED(status)){

1583

if(WEXITSTATUS(status) != 0){

1584

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

1585

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

1586

WEXITSTATUS(status));

1587

free(fullname);

1588

continue;

1589

}

1590

} else if(WIFSIGNALED(status)){

1591

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

1592

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

1593

WTERMSIG(status));

1594

free(fullname);

1595

continue;

1596

} else {

1597

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

1598

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

1599

free(fullname);

1600

continue;

1601

}

1602

}

1603

free(fullname);

1604

if(debug){

1605

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

1606

direntry->d_name);

1607

}

1608

}

1609

close(devnull);

1610

}

1611

return true;

1612

}

1613

1614

error_t bring_up_interface(const char *const interface,

1615

const float delay){

1616

int sd = -1;

1617

error_t old_errno = errno;

1618

error_t ret_errno = 0;

1619

int ret, ret_setflags;

1620

struct ifreq network;

1621

unsigned int if_index = if_nametoindex(interface);

1622

if(if_index == 0){

1623

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

1624

errno = old_errno;

1625

return ENXIO;

1626

}

1627

1628

if(quit_now){

1629

errno = old_errno;

1630

return EINTR;

1631

}

1632

1633

if(not interface_is_up(interface)){

1634

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

1635

ret_errno = errno;

1636

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

1637

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

1638

return ret_errno;

1639

}

1640

network.ifr_flags |= IFF_UP;

1641

1642

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1643

if(sd < 0){

1644

ret_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return ret_errno;

1648

}

1649

1650

if(quit_now){

1651

close(sd);

1652

errno = old_errno;

1653

return EINTR;

1654

}

1655

1656

if(debug){

1657

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

1658

interface);

1659

}

1660

1661

/* Raise priviliges */

1662

raise_privileges();

1663

1664

#ifdef __linux__

1665

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1666

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

1667

int ret_linux = klogctl(8, NULL, 5);

1668

bool restore_loglevel = true;

1669

if(ret_linux == -1){

1670

restore_loglevel = false;

1671

perror_plus("klogctl");

1672

}

1673

#endif /* __linux__ */

1674

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

1675

ret_errno = errno;

1676

#ifdef __linux__

1677

if(restore_loglevel){

1678

ret_linux = klogctl(7, NULL, 0);

1679

if(ret_linux == -1){

1680

perror_plus("klogctl");

1681

}

1682

}

1683

#endif /* __linux__ */

1684

1685

/* Lower privileges */

1686

lower_privileges();

1687

1688

/* Close the socket */

1689

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

1690

if(ret == -1){

1691

perror_plus("close");

1692

}

1693

1694

if(ret_setflags == -1){

1695

errno = ret_errno;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

errno = old_errno;

1698

return ret_errno;

1699

}

1700

} else if(debug){

1701

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

1702

interface);

1703

}

1704

1705

/* Sleep checking until interface is running.

1706

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

1707

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

1708

if(interface_is_running(interface)){

1709

break;

1710

}

1711

struct timespec sleeptime = { .tv_nsec = 250000000 };

1712

ret = nanosleep(&sleeptime, NULL);

1713

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

1714

perror_plus("nanosleep");

1715

}

1716

}

1717

1718

errno = old_errno;

1719

return 0;

1720

}

1721

1722

error_t take_down_interface(const char *const interface){

1723

int sd = -1;

1724

error_t old_errno = errno;

1725

error_t ret_errno = 0;

1726

int ret, ret_setflags;

1727

struct ifreq network;

1728

unsigned int if_index = if_nametoindex(interface);

1729

if(if_index == 0){

1730

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

1731

errno = old_errno;

1732

return ENXIO;

1733

}

1734

if(interface_is_up(interface)){

1735

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

1736

ret_errno = errno;

1737

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

1738

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

1739

return ret_errno;

1740

}

1741

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

1742

1743

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1744

if(sd < 0){

1745

ret_errno = errno;

1746

perror_plus("socket");

1747

errno = old_errno;

1748

return ret_errno;

1749

}

1750

1751

if(debug){

1752

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

1753

interface);

1754

}

1755

1756

/* Raise priviliges */

1757

raise_privileges();

1758

1759

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

1760

ret_errno = errno;

1761

1762

/* Lower privileges */

1763

lower_privileges();

1764

1765

/* Close the socket */

1766

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

1767

if(ret == -1){

1768

perror_plus("close");

1769

}

1770

1771

if(ret_setflags == -1){

1772

errno = ret_errno;

1773

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1774

errno = old_errno;

1775

return ret_errno;

1776

}

1777

} else if(debug){

1778

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

1779

interface);

1780

}

1781

1782

errno = old_errno;

1783

return 0;

1784

}

1785

1343

1786

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

1787

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

1788

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

1789

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

1790

.interfaces = NULL, .interfaces_size = 0 };

1344

1791

AvahiSServiceBrowser *sb = NULL;

1345

int error;

1792

error_t ret_errno;

1346

1793

int ret;

1347

1794

intmax_t tmpmax;

1348

1795

char *tmp;

1349

1796

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1797

char *interfaces_to_take_down = NULL;

1798

size_t interfaces_to_take_down_size = 0;

1356

1799

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

1357

1800

bool tempdir_created = false;

1358

1801

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

1802

const char *seckey = PATHDIR "/" SECKEY;

1360

1803

const char *pubkey = PATHDIR "/" PUBKEY;

1804

char *interfaces_hooks = NULL;

1805

size_t interfaces_hooks_size = 0;

1361

1806

1362

1807

bool gnutls_initialized = false;

1363

1808

bool gpgme_initialized = false;

1425

1870

.group = 2 },

1426

1871

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

1427

1872

.arg = "SECONDS",

1428

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

1873

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

1874

.group = 2 },

1875

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

1876

.arg = "DIR",

1877

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

1429

1878

.group = 2 },

1430

1879

/*

1431

1880

* These reproduce what we would get without ARGP_NO_HELP

1450

1899

connect_to = arg;

1451

1900

break;

1452

1901

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

1453

interface = arg;

1902

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

1903

arg, (int)',');

1904

if(ret_errno != 0){

1905

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

1906

}

1454

1907

break;

1455

1908

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

1456

1909

seckey = arg;

1485

1938

argp_error(state, "Bad retry interval");

1486

1939

}

1487

1940

break;

1941

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

1942

hookdir = arg;

1943

break;

1488

1944

/*

1489

1945

* These reproduce what we would get without ARGP_NO_HELP

1490

1946

*/

1496

1952

argp_state_help(state, state->out_stream,

1497

1953

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1954

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

1499

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

1955

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

1500

1956

exit(argp_err_exit_status);

1501

1957

break;

1502

1958

default:

1529

1985

{

1530

1986

/* Work around Debian bug #633582:

1531

1987

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

1532

struct stat st;

1533

1988

1534

1989

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1990

if(raise_privileges() == 0){

1991

struct stat st;

1992

1993

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

1994

int seckey_fd = open(seckey, O_RDONLY);

1995

if(seckey_fd == -1){

1996

perror_plus("open");

1997

} else {

1998

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

1999

if(ret == -1){

2000

perror_plus("fstat");

2001

} else {

2002

if(S_ISREG(st.st_mode)

2003

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

2004

ret = fchown(seckey_fd, uid, gid);

2005

if(ret == -1){

2006

perror_plus("fchown");

2007

}

2008

}

2009

}

2010

TEMP_FAILURE_RETRY(close(seckey_fd));

2011

}

2012

}

2013

2014

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

2015

int pubkey_fd = open(pubkey, O_RDONLY);

2016

if(pubkey_fd == -1){

2017

perror_plus("open");

2018

} else {

2019

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

2020

if(ret == -1){

2021

perror_plus("fstat");

2022

} else {

2023

if(S_ISREG(st.st_mode)

2024

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

2025

ret = fchown(pubkey_fd, uid, gid);

2026

if(ret == -1){

2027

perror_plus("fchown");

2028

}

2029

}

2030

}

2031

TEMP_FAILURE_RETRY(close(pubkey_fd));

2032

}

2033

}

2034

2035

/* Lower privileges */

2036

lower_privileges();

2037

}

2038

}

2039

2040

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

2041

{

2042

char *interface = NULL;

2043

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

2044

interface))){

2045

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

2046

and if_nametoindex(interface) == 0){

2047

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

2048

fprintf_plus(stderr, "Not using nonexisting interface"

2049

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

2050

}

2051

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

2052

interface = NULL;

2053

}

2054

}

2055

}

2056

2057

/* Run network hooks */

2058

{

2059

if(mc.interfaces != NULL){

2060

interfaces_hooks = malloc(mc.interfaces_size);

2061

if(interfaces_hooks == NULL){

2062

perror_plus("malloc");

1644

2063

goto end;

1645

2064

}

1646

}

1647

close(devnull);

2065

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

2066

interfaces_hooks_size = mc.interfaces_size;

2067

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2068

(int)',');

2069

}

2070

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2071

interfaces_hooks : "", delay)){

2072

goto end;

2073

}

1648

2074

}

1649

2075

1650

2076

if(not debug){

1651

2077

avahi_set_log_function(empty_log);

1652

2078

}

1653

2079

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1686

2080

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

1687

2081

from the signal handler */

1688

2082

/* Initialize the pseudo-RNG for Avahi */

1689

2083

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

1690

mc.simple_poll = avahi_simple_poll_new();

1691

if(mc.simple_poll == NULL){

1692

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

2084

simple_poll = avahi_simple_poll_new();

2085

if(simple_poll == NULL){

2086

fprintf_plus(stderr,

2087

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

1693

2088

exitcode = EX_UNAVAILABLE;

1694

2089

goto end;

1695

2090

}

1757

2152

}

1758

2153

}

1759

2154

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

2155

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

2156

if(mc.interfaces == NULL){

2157

struct dirent **direntries;

2158

/* Look for any good interfaces */

2159

ret = scandir(sys_class_net, &direntries, good_interface,

2160

alphasort);

2161

if(ret >= 1){

2162

/* Add all found interfaces to interfaces list */

2163

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

2164

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

2165

direntries[i]->d_name);

2166

if(ret_errno != 0){

2167

perror_plus("argz_add");

2168

continue;

2169

}

2170

if(debug){

2171

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

2172

direntries[i]->d_name);

2173

}

2174

}

2175

free(direntries);

2176

} else {

2177

free(direntries);

2178

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

2179

exitcode = EXIT_FAILURE;

2180

goto end;

2181

}

2182

}

2183

2184

/* Bring up interfaces which are down */

2185

{

2186

char *interface = NULL;

2187

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

2188

interface))){

2189

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

2190

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

2191

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

2192

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

2193

interface);

2194

interface = NULL;

2195

while((interface = argz_next(mc.interfaces,

2196

mc.interfaces_size, interface))){

2197

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

2198

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

2199

interface);

2200

interface = NULL;

1845

2201

}

1846

2202

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

2203

break;

1865

2204

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

2205

bool interface_was_up = interface_is_up(interface);

2206

ret = bring_up_interface(interface, delay);

2207

if(not interface_was_up){

2208

if(ret != 0){

2209

errno = ret;

2210

perror_plus("Failed to bring up interface");

2211

} else {

2212

ret_errno = argz_add(&interfaces_to_take_down,

2213

&interfaces_to_take_down_size,

2214

interface);

2215

}

2216

}

2217

}

2218

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

2219

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

2220

}

2221

}

2222

2223

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

2224

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

2225

if(debug){

2226

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

2227

mc.interfaces);

2228

}

2229

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

1903

2230

}

1904

2231

1905

2232

if(quit_now){

1906

2233

goto end;

1907

2234

}

1908

2235

1909

ret = init_gnutls_global(pubkey, seckey);

2236

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

1910

2237

if(ret == -1){

1911

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

2238

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

1912

2239

exitcode = EX_UNAVAILABLE;

1913

2240

goto end;

1914

2241

} else {

1929

2256

goto end;

1930

2257

}

1931

2258

1932

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

1933

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

2259

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

2260

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

1934

2261

exitcode = EX_UNAVAILABLE;

1935

2262

goto end;

1936

2263

} else {

1945

2272

/* Connect directly, do not use Zeroconf */

1946

2273

/* (Mainly meant for debugging) */

1947

2274

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

2275

1948

2276

if(address == NULL){

1949

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

2277

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

1950

2278

exitcode = EX_USAGE;

1951

2279

goto end;

1952

2280

}

1955

2283

goto end;

1956

2284

}

1957

2285

1958

uint16_t port;

2286

in_port_t port;

1959

2287

errno = 0;

1960

2288

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

1961

2289

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

1962

or tmpmax != (uint16_t)tmpmax){

1963

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

2290

or tmpmax != (in_port_t)tmpmax){

2291

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

1964

2292

exitcode = EX_USAGE;

1965

2293

goto end;

1966

2294

}

1967

2295

1968

2296

if(quit_now){

1969

2297

goto end;

1970

2298

}

1971

2299

1972

port = (uint16_t)tmpmax;

2300

port = (in_port_t)tmpmax;

1973

2301

*address = '\0';

1974

2302

/* Colon in address indicates IPv6 */

1975

2303

int af;

1991

2319

}

1992

2320

1993

2321

while(not quit_now){

1994

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

2322

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

2323

&mc);

1995

2324

if(quit_now or ret == 0){

1996

2325

break;

1997

2326

}

1998

2327

if(debug){

1999

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

2000

(int)retry_interval);

2328

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

2329

(int)retry_interval);

2001

2330

}

2002

2331

sleep((int)retry_interval);

2003

2332

}

2023

2352

config.publish_domain = 0;

2024

2353

2025

2354

/* Allocate a new server */

2026

mc.server = avahi_server_new(avahi_simple_poll_get

2027

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2355

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2356

&config, NULL, NULL, &ret_errno);

2029

2357

2030

2358

/* Free the Avahi configuration data */

2031

2359

avahi_server_config_free(&config);

2033

2361

2034

2362

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

2035

2363

if(mc.server == NULL){

2036

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

2037

avahi_strerror(error));

2364

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

2365

avahi_strerror(ret_errno));

2038

2366

exitcode = EX_UNAVAILABLE;

2039

2367

goto end;

2040

2368

}

2046

2374

/* Create the Avahi service browser */

2047

2375

sb = avahi_s_service_browser_new(mc.server, if_index,

2048

2376

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2049

NULL, 0, browse_callback, NULL);

2377

NULL, 0, browse_callback,

2378

(void *)&mc);

2050

2379

if(sb == NULL){

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2380

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

2381

avahi_strerror(avahi_server_errno(mc.server)));

2053

2382

exitcode = EX_UNAVAILABLE;

2054

2383

goto end;

2055

2384

}

2061

2390

/* Run the main loop */

2062

2391

2063

2392

if(debug){

2064

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

2393

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

2065

2394

}

2066

2395

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2396

ret = avahi_loop_with_timeout(simple_poll,

2397

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

2069

2398

if(debug){

2070

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

2071

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

2399

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

2400

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

2072

2401

}

2073

2402

2074

2403

end:

2075

2404

2076

2405

if(debug){

2077

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

2406

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

2078

2407

}

2079

2408

2080

2409

/* Cleanup things */

2410

free(mc.interfaces);

2411

2081

2412

if(sb != NULL)

2082

2413

avahi_s_service_browser_free(sb);

2083

2414

2084

2415

if(mc.server != NULL)

2085

2416

avahi_server_free(mc.server);

2086

2417

2087

if(mc.simple_poll != NULL)

2088

avahi_simple_poll_free(mc.simple_poll);

2418

if(simple_poll != NULL)

2419

avahi_simple_poll_free(simple_poll);

2089

2420

2090

2421

if(gnutls_initialized){

2091

2422

gnutls_certificate_free_credentials(mc.cred);

2096

2427

if(gpgme_initialized){

2097

2428

gpgme_release(mc.ctx);

2098

2429

}

2099

2430

2100

2431

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

2101

2432

has seen */

2102

2433

if(mc.current_server != NULL){

2108

2439

}

2109

2440

}

2110

2441

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2442

/* Re-raise priviliges */

2443

{

2444

raise_privileges();

2445

2446

/* Run network hooks */

2447

run_network_hooks("stop", interfaces_hooks != NULL ?

2448

interfaces_hooks : "", delay);

2449

2450

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

2451

{

2452

char *interface = NULL;

2453

while((interface=argz_next(interfaces_to_take_down,

2454

interfaces_to_take_down_size,

2455

interface))){

2456

ret_errno = take_down_interface(interface);

2457

if(ret_errno != 0){

2458

errno = ret_errno;

2459

perror_plus("Failed to take down interface");

2130

2460

}

2131

2461

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2462

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

2463

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

2464

" down\n");

2141

2465

}

2142

2466

}

2467

2468

lower_privileges_permanently();

2143

2469

}

2144

2470

2471

free(interfaces_to_take_down);

2472

free(interfaces_hooks);

2473

2145

2474

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

2146

2475

if(tempdir_created){

2147

2476

struct dirent **direntries = NULL;

2160

2489

}

2161

2490

ret = remove(fullname);

2162

2491

if(ret == -1){

2163

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

2164

strerror(errno));

2492

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

2493

strerror(errno));

2165

2494

}

2166

2495

free(fullname);

2167

2496

}