/mandos/release : revision 237.15.5

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, intptr_t */

44

#include <stdint.h> /* uint16_t, uint32_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

getnameinfo() */

58

inet_pton(), connect() */

60

59

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

61

60

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

62

61

*/

63

62

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

64

63

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(), _exit() */

77

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

76

setgid(), pause() */

77

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

78

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

79

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

80

argp_state, struct argp,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

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

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

97

90

98

91

#ifdef __linux__

99

92

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

136

129

137

130

bool debug = false;

138

131

static const char mandos_protocol_version[] = "1";

139

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

140

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

132

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

133

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

141

134

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

142

135

char *connect_to = NULL;

143

136

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

146

137

147

138

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

148

139

typedef struct server{

149

140

const char *ip;

150

in_port_t port;

141

uint16_t port;

151

142

AvahiIfIndex if_index;

152

143

int af;

153

144

struct timespec last_seen;

157

148

158

149

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

159

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

160

152

AvahiServer *server;

161

153

gnutls_certificate_credentials_t cred;

162

154

unsigned int dh_bits;

164

156

const char *priority;

165

157

gpgme_ctx_t ctx;

166

158

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

159

} mandos_context;

170

160

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

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

166

174

167

sig_atomic_t quit_now = 0;

175

168

int signal_received = 0;

176

169

177

170

/* Function to use when printing errors */

178

171

void perror_plus(const char *print_text){

179

int e = errno;

180

172

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

181

173

program_invocation_short_name);

182

errno = e;

183

174

perror(print_text);

184

175

}

185

176

186

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

187

177

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

188

178

va_list ap;

189

179

va_start (ap, format);

190

180

191

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

192

program_invocation_short_name));

193

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

181

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

182

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

194

183

}

195

184

196

185

/*

198

187

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

199

188

* "buffer_length" is how much is already used.

200

189

*/

201

__attribute__((nonnull, warn_unused_result))

202

190

size_t incbuffer(char **buffer, size_t buffer_length,

203

191

size_t buffer_capacity){

204

192

if(buffer_length + BUFFER_SIZE > buffer_capacity){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

193

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

194

if(buffer == NULL){

211

195

return 0;

212

196

}

213

*buffer = new_buf;

214

197

buffer_capacity += BUFFER_SIZE;

215

198

}

216

199

return buffer_capacity;

217

200

}

218

201

219

202

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

220

__attribute__((nonnull, warn_unused_result))

221

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

222

int af, server **current_server){

203

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

204

int af){

223

205

int ret;

224

206

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

225

207

if(new_server == NULL){

226

208

perror_plus("malloc");

227

return false;

209

return -1;

228

210

}

229

211

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

230

212

.port = port,

232

214

.af = af };

233

215

if(new_server->ip == NULL){

234

216

perror_plus("strdup");

235

return false;

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

217

return -1;

241

218

}

242

219

/* Special case of first server */

243

if(*current_server == NULL){

220

if (mc.current_server == NULL){

244

221

new_server->next = new_server;

245

222

new_server->prev = new_server;

246

*current_server = new_server;

223

mc.current_server = new_server;

224

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

247

225

} else {

248

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

249

new_server->next = *current_server;

250

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

226

new_server->next = mc.current_server;

227

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

251

228

new_server->prev->next = new_server;

252

(*current_server)->prev = new_server;

253

}

254

return true;

229

mc.current_server->prev = new_server;

230

}

231

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

232

if(ret == -1){

233

perror_plus("clock_gettime");

234

return -1;

235

}

236

return 0;

255

237

}

256

238

257

239

/*

258

240

* Initialize GPGME.

259

241

*/

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

242

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

243

const char *tempdir){

265

244

gpgme_error_t rc;

266

245

gpgme_engine_info_t engine_info;

267

246

247

268

248

/*

269

249

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

270

250

*/

271

bool import_key(const char * const filename){

251

bool import_key(const char *filename){

272

252

int ret;

273

253

int fd;

274

254

gpgme_data_t pgp_data;

281

261

282

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

283

263

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

264

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

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

286

267

return false;

287

268

}

288

269

289

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

270

rc = gpgme_op_import(mc.ctx, pgp_data);

290

271

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

293

275

return false;

294

276

}

295

277

302

284

}

303

285

304

286

if(debug){

305

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

287

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

288

"Initializing GPGME\n");

306

289

}

307

290

308

291

/* Init GPGME */

309

292

gpgme_check_version(NULL);

310

293

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

311

294

if(rc != GPG_ERR_NO_ERROR){

312

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

313

gpgme_strsource(rc), gpgme_strerror(rc));

295

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

296

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

297

gpgme_strsource(rc), gpgme_strerror(rc));

314

298

return false;

315

299

}

316

300

317

301

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

318

302

rc = gpgme_get_engine_info(&engine_info);

319

303

if(rc != GPG_ERR_NO_ERROR){

320

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

321

gpgme_strsource(rc), gpgme_strerror(rc));

304

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

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

322

307

return false;

323

308

}

324

309

while(engine_info != NULL){

330

315

engine_info = engine_info->next;

331

316

}

332

317

if(engine_info == NULL){

333

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

334

tempdir);

318

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

319

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

335

320

return false;

336

321

}

337

322

338

323

/* Create new GPGME "context" */

339

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

324

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

340

325

if(rc != GPG_ERR_NO_ERROR){

341

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

342

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

343

gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

344

329

return false;

345

330

}

346

331

355

340

* Decrypt OpenPGP data.

356

341

* Returns -1 on error

357

342

*/

358

__attribute__((nonnull, warn_unused_result))

359

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

344

size_t crypto_size,

361

char **plaintext,

362

mandos_context *mc){

345

char **plaintext){

363

346

gpgme_data_t dh_crypto, dh_plain;

364

347

gpgme_error_t rc;

365

348

ssize_t ret;

367

350

ssize_t plaintext_length = 0;

368

351

369

352

if(debug){

370

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

353

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

354

"Trying to decrypt OpenPGP data\n");

371

355

}

372

356

373

357

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

374

358

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

375

359

0);

376

360

if(rc != GPG_ERR_NO_ERROR){

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

379

364

return -1;

380

365

}

381

366

382

367

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

383

368

rc = gpgme_data_new(&dh_plain);

384

369

if(rc != GPG_ERR_NO_ERROR){

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

388

373

gpgme_data_release(dh_crypto);

389

374

return -1;

390

375

}

391

376

392

377

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

393

378

data buffer */

394

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

379

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

395

380

if(rc != GPG_ERR_NO_ERROR){

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

398

384

plaintext_length = -1;

399

385

if(debug){

400

386

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

387

result = gpgme_op_decrypt_result(mc.ctx);

402

388

if(result == NULL){

403

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

389

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

390

"gpgme_op_decrypt_result failed\n");

404

391

} else {

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

392

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

393

"Unsupported algorithm: %s\n",

394

result->unsupported_algorithm);

395

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

396

"Wrong key usage: %u\n",

397

result->wrong_key_usage);

409

398

if(result->file_name != NULL){

410

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

399

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

400

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

411

401

}

412

402

gpgme_recipient_t recipient;

413

403

recipient = result->recipients;

414

404

while(recipient != NULL){

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

405

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

406

"Public key algorithm: %s\n",

407

gpgme_pubkey_algo_name(recipient->pubkey_algo));

408

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

409

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

410

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

411

"Secret key available: %s\n",

412

recipient->status == GPG_ERR_NO_SECKEY

413

? "No" : "Yes");

422

414

recipient = recipient->next;

423

415

}

424

416

}

427

419

}

428

420

429

421

if(debug){

430

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

422

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

423

"Decryption of OpenPGP data succeeded\n");

431

424

}

432

425

433

426

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

464

457

}

465

458

466

459

if(debug){

467

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

460

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

461

"Decrypted password is: ");

468

462

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

469

463

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

470

464

}

481

475

return plaintext_length;

482

476

}

483

477

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

478

static const char * safer_gnutls_strerror(int value){

479

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

480

-Wunreachable-code */

487

481

if(ret == NULL)

488

482

ret = "(unknown)";

489

483

return ret;

490

484

}

491

485

492

486

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

487

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

495

488

const char* string){

496

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

489

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

497

490

}

498

491

499

__attribute__((nonnull, warn_unused_result))

500

492

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

493

const char *seckeyfilename){

503

494

int ret;

504

495

505

496

if(debug){

506

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

497

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

498

"Initializing GnuTLS\n");

507

499

}

508

500

509

501

ret = gnutls_global_init();

510

502

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

503

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

504

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

513

505

return -1;

514

506

}

515

507

522

514

}

523

515

524

516

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

517

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

518

if(ret != GNUTLS_E_SUCCESS){

527

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

528

safer_gnutls_strerror(ret));

519

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

520

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

529

521

gnutls_global_deinit();

530

522

return -1;

531

523

}

532

524

533

525

if(debug){

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

526

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

527

"Attempting to use OpenPGP public key %s and"

528

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

529

seckeyfilename);

538

530

}

539

531

540

532

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

533

(mc.cred, pubkeyfilename, seckeyfilename,

542

534

GNUTLS_OPENPGP_FMT_BASE64);

543

535

if(ret != GNUTLS_E_SUCCESS){

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

536

fprintf(stderr,

537

"Mandos plugin mandos-client: "

538

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

539

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

540

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

541

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

549

542

goto globalfail;

550

543

}

551

544

552

545

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

546

ret = gnutls_dh_params_init(&mc.dh_params);

554

547

if(ret != GNUTLS_E_SUCCESS){

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

548

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

549

"Error in GnuTLS DH parameter initialization:"

550

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

558

551

goto globalfail;

559

552

}

560

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

553

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

561

554

if(ret != GNUTLS_E_SUCCESS){

562

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

563

safer_gnutls_strerror(ret));

555

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

556

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

557

safer_gnutls_strerror(ret));

564

558

goto globalfail;

565

559

}

566

560

567

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

561

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

562

569

563

return 0;

570

564

571

565

globalfail:

572

566

573

gnutls_certificate_free_credentials(mc->cred);

567

gnutls_certificate_free_credentials(mc.cred);

574

568

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

569

gnutls_dh_params_deinit(mc.dh_params);

576

570

return -1;

577

571

}

578

572

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

573

static int init_gnutls_session(gnutls_session_t *session){

582

574

int ret;

583

575

/* GnuTLS session creation */

584

576

do {

588

580

}

589

581

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

590

582

if(ret != GNUTLS_E_SUCCESS){

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

583

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

584

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

585

safer_gnutls_strerror(ret));

594

586

}

595

587

596

588

{

597

589

const char *err;

598

590

do {

599

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

591

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

600

592

if(quit_now){

601

593

gnutls_deinit(*session);

602

594

return -1;

603

595

}

604

596

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

605

597

if(ret != GNUTLS_E_SUCCESS){

606

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

607

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

608

safer_gnutls_strerror(ret));

598

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

599

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

600

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

601

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

609

602

gnutls_deinit(*session);

610

603

return -1;

611

604

}

613

606

614

607

do {

615

608

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

609

mc.cred);

617

610

if(quit_now){

618

611

gnutls_deinit(*session);

619

612

return -1;

620

613

}

621

614

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

622

615

if(ret != GNUTLS_E_SUCCESS){

623

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

624

safer_gnutls_strerror(ret));

616

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

617

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

618

safer_gnutls_strerror(ret));

625

619

gnutls_deinit(*session);

626

620

return -1;

627

621

}

629

623

/* ignore client certificate if any. */

630

624

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

625

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

626

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

627

634

628

return 0;

635

629

}

639

633

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

640

634

641

635

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

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

636

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

644

637

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

638

int af){

646

639

int ret, tcp_sd = -1;

647

640

ssize_t sret;

648

struct sockaddr_storage to;

641

union {

642

struct sockaddr_in in;

643

struct sockaddr_in6 in6;

644

} to;

649

645

char *buffer = NULL;

650

646

char *decrypted_buffer = NULL;

651

647

size_t buffer_length = 0;

670

666

pf = PF_INET;

671

667

break;

672

668

default:

673

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

669

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

670

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

674

671

errno = EINVAL;

675

672

return -1;

676

673

}

677

674

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

675

ret = init_gnutls_session(&session);

711

676

if(ret != 0){

712

677

return -1;

713

678

}

714

679

715

680

if(debug){

716

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

717

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

681

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

682

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

683

"\n", ip, port);

718

684

}

719

685

720

686

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

698

733

699

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

734

700

if(af == AF_INET6){

735

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

736

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

701

to.in6.sin6_family = (sa_family_t)af;

702

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

737

703

} else { /* IPv4 */

738

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

739

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

704

to.in.sin_family = (sa_family_t)af;

705

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

740

706

}

741

707

if(ret < 0 ){

742

708

int e = errno;

746

712

}

747

713

if(ret == 0){

748

714

int e = errno;

749

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

715

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

716

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

750

717

errno = e;

751

718

goto mandos_end;

752

719

}

753

720

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

721

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

722

-Wconversion and

723

-Wunreachable-code */

724

725

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

726

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

727

-Wunreachable-code*/

757

728

if(if_index == AVAHI_IF_UNSPEC){

758

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

759

" incomplete without a network interface\n");

729

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

730

"An IPv6 link-local address is incomplete"

731

" without a network interface\n");

760

732

errno = EINVAL;

761

733

goto mandos_end;

762

734

}

763

735

/* Set the network interface number as scope */

764

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

736

to.in6.sin6_scope_id = (uint32_t)if_index;

765

737

}

766

738

} else {

767

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

739

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

740

-Wconversion and

741

-Wunreachable-code */

768

742

}

769

743

770

744

if(quit_now){

778

752

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

779

753

perror_plus("if_indextoname");

780

754

} else {

781

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

782

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

755

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

756

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

757

ip, interface, port);

783

758

}

784

759

} else {

785

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

786

ip, (uintmax_t)port);

760

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

761

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

787

762

}

788

763

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

764

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

765

const char *pcret;

790

766

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

767

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

768

sizeof(addrstr));

795

769

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

770

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

771

sizeof(addrstr));

800

772

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

773

if(pcret == NULL){

774

perror_plus("inet_ntop");

775

} else {

776

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

777

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

778

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

779

}

807

780

}

808

781

}

809

782

813

786

}

814

787

815

788

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

789

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

818

790

} else {

819

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

820

sizeof(struct sockaddr_in));

791

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

821

792

}

822

793

if(ret < 0){

823

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

794

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

824

795

int e = errno;

825

796

perror_plus("connect");

826

797

errno = e;

864

835

}

865

836

866

837

if(debug){

867

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

838

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

839

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

868

840

}

869

841

870

842

if(quit_now){

872

844

goto mandos_end;

873

845

}

874

846

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

847

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

848

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

880

849

881

850

if(quit_now){

882

851

errno = EINTR;

893

862

894

863

if(ret != GNUTLS_E_SUCCESS){

895

864

if(debug){

896

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

865

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

866

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

897

867

gnutls_perror(ret);

898

868

}

899

869

errno = EPROTO;

903

873

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

904

874

905

875

if(debug){

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

876

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

877

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

908

878

}

909

879

910

880

while(true){

948

918

}

949

919

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

950

920

if(ret < 0){

951

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

952

"***\n");

921

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

922

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

953

923

gnutls_perror(ret);

954

924

errno = EPROTO;

955

925

goto mandos_end;

956

926

}

957

927

break;

958

928

default:

959

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

960

" encrypted session with Mandos server\n");

929

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

930

"Unknown error while reading data from"

931

" encrypted session with Mandos server\n");

961

932

gnutls_bye(session, GNUTLS_SHUT_RDWR);

962

933

errno = EIO;

963

934

goto mandos_end;

968

939

}

969

940

970

941

if(debug){

971

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

942

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

943

"Closing TLS session\n");

972

944

}

973

945

974

946

if(quit_now){

987

959

if(buffer_length > 0){

988

960

ssize_t decrypted_buffer_size;

989

961

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

962

&decrypted_buffer);

991

963

if(decrypted_buffer_size >= 0){

992

964

993

965

written = 0;

1003

975

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

1004

976

int e = errno;

1005

977

if(debug){

1006

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

1007

strerror(errno));

978

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

979

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

980

strerror(errno));

1008

981

}

1009

982

errno = e;

1010

983

goto mandos_end;

1041

1014

return retval;

1042

1015

}

1043

1016

1044

__attribute__((nonnull))

1045

1017

static void resolve_callback(AvahiSServiceResolver *r,

1046

1018

AvahiIfIndex interface,

1047

1019

AvahiProtocol proto,

1055

1027

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1029

flags,

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(r);

1062

1032

1063

1033

/* Called whenever a service has been resolved successfully or

1064

1034

timed out */

1070

1040

switch(event){

1071

1041

default:

1072

1042

case AVAHI_RESOLVER_FAILURE:

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

1043

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

1044

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

1045

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

1046

avahi_strerror(avahi_server_errno(mc.server)));

1078

1047

break;

1079

1048

1080

1049

case AVAHI_RESOLVER_FOUND:

1082

1051

char ip[AVAHI_ADDRESS_STR_MAX];

1083

1052

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

1084

1053

if(debug){

1085

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

1086

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

1087

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

1054

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

1055

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

1056

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

1057

ip, (intmax_t)interface, port);

1088

1058

}

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1059

int ret = start_mandos_communication(ip, port, interface,

1060

avahi_proto_to_af(proto));

1093

1061

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1062

avahi_simple_poll_quit(mc.simple_poll);

1095

1063

} else {

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1064

ret = add_server(ip, port, interface,

1065

avahi_proto_to_af(proto));

1102

1066

}

1103

1067

}

1104

1068

}

1114

1078

const char *domain,

1115

1079

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1080

flags,

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1081

AVAHI_GCC_UNUSED void* userdata){

1082

assert(b);

1121

1083

1122

1084

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

1123

1085

is removed from the LAN */

1130

1092

default:

1131

1093

case AVAHI_BROWSER_FAILURE:

1132

1094

1133

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1095

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

1096

"(Avahi browser) %s\n",

1097

avahi_strerror(avahi_server_errno(mc.server)));

1098

avahi_simple_poll_quit(mc.simple_poll);

1137

1099

return;

1138

1100

1139

1101

case AVAHI_BROWSER_NEW:

1142

1104

the callback function is called the Avahi server will free the

1143

1105

resolver for us. */

1144

1106

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1107

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

1108

name, type, domain, protocol, 0,

1109

resolve_callback, NULL) == NULL)

1110

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

1111

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

1112

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

1153

1113

break;

1154

1114

1155

1115

case AVAHI_BROWSER_REMOVE:

1158

1118

case AVAHI_BROWSER_ALL_FOR_NOW:

1159

1119

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1160

1120

if(debug){

1161

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

1162

" searching...\n");

1121

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

1122

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

1163

1123

}

1164

1124

break;

1165

1125

}

1174

1134

signal_received = sig;

1175

1135

int old_errno = errno;

1176

1136

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1137

if(mc.simple_poll != NULL){

1138

avahi_simple_poll_quit(mc.simple_poll);

1179

1139

}

1180

1140

errno = old_errno;

1181

1141

}

1182

1142

1183

__attribute__((nonnull, warn_unused_result))

1184

1143

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

1185

1144

int ret;

1186

error_t ret_errno;

1187

1145

1188

1146

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

1189

1147

if(s < 0){

1190

ret_errno = errno;

1191

1148

perror_plus("socket");

1192

errno = ret_errno;

1193

1149

return false;

1194

1150

}

1195

1151

strcpy(ifr->ifr_name, ifname);

1196

1152

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

1153

if(ret == -1){

1198

1154

if(debug){

1199

ret_errno = errno;

1200

1155

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

1156

}

1203

1157

return false;

1204

1158

}

1205

1159

return true;

1206

1160

}

1207

1161

1208

__attribute__((nonnull, warn_unused_result))

1209

1162

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

1210

1163

1211

1164

/* Reject the loopback device */

1212

1165

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

1166

if(debug){

1214

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

1215

ifname);

1167

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

1168

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

1216

1169

}

1217

1170

return false;

1218

1171

}

1219

1172

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

1220

1173

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

1221

1174

if(debug){

1222

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

1223

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

1175

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

1176

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

1224

1177

}

1225

1178

return true;

1226

1179

}

1227

1180

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

1228

1181

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

1229

1182

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1183

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

1184

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

1232

1185

}

1233

1186

return false;

1234

1187

}

1235

1188

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

1236

1189

if(ifr->ifr_flags & IFF_NOARP){

1237

1190

if(debug){

1238

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

1239

ifname);

1191

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

1192

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

1240

1193

}

1241

1194

return false;

1242

1195

}

1243

1196

1244

1197

/* Accept this device */

1245

1198

if(debug){

1246

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

1199

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

1200

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

1247

1201

}

1248

1202

return true;

1249

1203

}

1253

1207

* corresponds to an acceptable network device.

1254

1208

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

1255

1209

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1210

int good_interface(const struct dirent *if_entry){

1258

1211

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

1259

1212

return 0;

1262

1215

struct ifreq ifr;

1263

1216

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

1264

1217

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1218

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

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

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

1226

return 0;

1227

}

1228

return 1;

1229

}

1230

1231

/*

1232

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

1233

* corresponds to an acceptable network device which is up.

1234

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

1235

*/

1236

int up_interface(const struct dirent *if_entry){

1237

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

1238

return 0;

1239

}

1240

1241

struct ifreq ifr;

1242

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

1243

if(debug){

1244

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

1245

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

1246

if_entry->d_name);

1247

}

1248

return 0;

1249

}

1250

1251

/* Reject down interfaces */

1252

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

1253

if(debug){

1254

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

1255

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

1256

if_entry->d_name);

1257

}

1258

return 0;

1259

}

1260

1261

/* Reject non-running interfaces */

1262

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

1263

if(debug){

1264

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

1265

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

1266

if_entry->d_name);

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1312

1277

int notdotentries(const struct dirent *direntry){

1313

1278

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

1314

1279

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

1321

1286

}

1322

1287

1323

1288

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1289

int runnable_hook(const struct dirent *direntry){

1326

1290

int ret;

1327

1291

size_t sret;

1339

1303

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

1340

1304

/* Contains non-allowed characters */

1341

1305

if(debug){

1342

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

1343

direntry->d_name);

1306

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

1307

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

1308

direntry->d_name);

1344

1309

}

1345

1310

return 0;

1346

1311

}

1362

1327

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

1363

1328

/* Not a regular file */

1364

1329

if(debug){

1365

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

1366

direntry->d_name);

1330

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

1331

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

1332

direntry->d_name);

1367

1333

}

1368

1334

return 0;

1369

1335

}

1370

1336

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

1371

1337

/* Not executable */

1372

1338

if(debug){

1373

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

1374

direntry->d_name);

1339

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

1340

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

1341

direntry->d_name);

1375

1342

}

1376

1343

return 0;

1377

1344

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

1345

return 1;

1383

1346

}

1384

1347

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1348

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1388

1349

int ret;

1389

1350

struct timespec now;

1390

1351

struct timespec waited_time;

1391

1352

intmax_t block_time;

1392

1353

1393

1354

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1355

if(mc.current_server == NULL){

1356

if (debug){

1357

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

1358

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

1398

1359

}

1399

1360

ret = avahi_simple_poll_iterate(s, -1);

1400

1361

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1362

if (debug){

1363

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

1364

"Check current_server if we should run it,"

1365

" or wait\n");

1404

1366

}

1405

1367

/* the current time */

1406

1368

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1411

1373

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

1412

1374

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

1413

1375

waited_time.tv_sec = (now.tv_sec

1414

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

1376

- mc.current_server->last_seen.tv_sec);

1415

1377

waited_time.tv_nsec = (now.tv_nsec

1416

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

1378

- mc.current_server->last_seen.tv_nsec);

1417

1379

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

1418

1380

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

1419

1381

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

1421

1383

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

1422

1384

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

1423

1385

1424

if(debug){

1425

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

1426

block_time);

1386

if (debug){

1387

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

1388

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

1427

1389

}

1428

1390

1429

1391

if(block_time <= 0){

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1392

ret = start_mandos_communication(mc.current_server->ip,

1393

mc.current_server->port,

1394

mc.current_server->if_index,

1395

mc.current_server->af);

1434

1396

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1397

avahi_simple_poll_quit(mc.simple_poll);

1436

1398

return 0;

1437

1399

}

1438

1400

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1401

&mc.current_server->last_seen);

1440

1402

if(ret == -1){

1441

1403

perror_plus("clock_gettime");

1442

1404

return -1;

1443

1405

}

1444

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

1406

mc.current_server = mc.current_server->next;

1445

1407

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

1446

1408

servers, but don't block */

1447

1409

}

1449

1411

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

1450

1412

}

1451

1413

if(ret != 0){

1452

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

1414

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

1453

1415

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

1454

1416

}

1455

1417

}

1456

1418

}

1457

1419

}

1458

1420

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

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

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1722

#ifdef __linux__

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1733

}

1734

#endif /* __linux__ */

1735

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

1736

ioctl_errno = errno;

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

ret_linux = klogctl(7, NULL, 0);

1740

if(ret_linux == -1){

1741

perror_plus("klogctl");

1742

}

1743

}

1744

#endif /* __linux__ */

1745

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1755

1756

/* Close the socket */

1757

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

1758

if(ret == -1){

1759

perror_plus("close");

1760

}

1761

1762

if(ret_setflags == -1){

1763

errno = ioctl_errno;

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1765

errno = old_errno;

1766

return ioctl_errno;

1767

}

1768

} else if(debug){

1769

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

1770

interface);

1771

}

1772

1773

/* Sleep checking until interface is running.

1774

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

1775

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

1776

if(interface_is_running(interface)){

1777

break;

1778

}

1779

struct timespec sleeptime = { .tv_nsec = 250000000 };

1780

ret = nanosleep(&sleeptime, NULL);

1781

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

1782

perror_plus("nanosleep");

1783

}

1784

}

1785

1786

errno = old_errno;

1787

return 0;

1788

}

1789

1790

__attribute__((nonnull, warn_unused_result))

1791

error_t take_down_interface(const char *const interface){

1792

error_t old_errno = errno;

1793

struct ifreq network;

1794

unsigned int if_index = if_nametoindex(interface);

1795

if(if_index == 0){

1796

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

1797

errno = old_errno;

1798

return ENXIO;

1799

}

1800

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1802

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

1803

ret_errno = errno;

1804

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

1805

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

1806

errno = old_errno;

1807

return ret_errno;

1808

}

1809

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

1810

1811

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

1812

if(sd == -1){

1813

ret_errno = errno;

1814

perror_plus("socket");

1815

errno = old_errno;

1816

return ret_errno;

1817

}

1818

1819

if(debug){

1820

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

1821

interface);

1822

}

1823

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1841

1842

/* Close the socket */

1843

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

1844

if(ret == -1){

1845

perror_plus("close");

1846

}

1847

1848

if(ret_setflags == -1){

1849

errno = ioctl_errno;

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1851

errno = old_errno;

1852

return ioctl_errno;

1853

}

1854

} else if(debug){

1855

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

1856

interface);

1857

}

1858

1859

errno = old_errno;

1860

return 0;

1861

}

1862

1863

1421

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

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

1868

1422

AvahiSServiceBrowser *sb = NULL;

1869

error_t ret_errno;

1423

int error;

1870

1424

int ret;

1871

1425

intmax_t tmpmax;

1872

1426

char *tmp;

1873

1427

int exitcode = EXIT_SUCCESS;

1874

char *interfaces_to_take_down = NULL;

1875

size_t interfaces_to_take_down_size = 0;

1876

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

1877

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

1878

char *tempdir = NULL;

1428

const char *interface = "";

1429

struct ifreq network;

1430

int sd = -1;

1431

bool take_down_interface = false;

1432

uid_t uid;

1433

gid_t gid;

1434

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

1435

bool tempdir_created = false;

1879

1436

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1880

1437

const char *seckey = PATHDIR "/" SECKEY;

1881

1438

const char *pubkey = PATHDIR "/" PUBKEY;

1882

char *interfaces_hooks = NULL;

1883

1439

1884

1440

bool gnutls_initialized = false;

1885

1441

bool gpgme_initialized = false;

1947

1503

.group = 2 },

1948

1504

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

1949

1505

.arg = "SECONDS",

1950

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

1506

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

1951

1507

.group = 2 },

1952

1508

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

1953

1509

.arg = "DIR",

1976

1532

connect_to = arg;

1977

1533

break;

1978

1534

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

1979

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

1980

arg, (int)',');

1981

if(ret_errno != 0){

1982

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

1983

}

1535

interface = arg;

1984

1536

break;

1985

1537

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

1986

1538

seckey = arg;

2029

1581

argp_state_help(state, state->out_stream,

2030

1582

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2031

1583

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

2032

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

1584

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

1585

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

2033

1586

exit(argp_err_exit_status);

2034

1587

break;

2035

1588

default:

2062

1615

{

2063

1616

/* Work around Debian bug #633582:

2064

1617

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

2065

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

1618

struct stat st;

1619

1620

/* Re-raise priviliges */

1621

errno = 0;

1622

ret = seteuid(0);

1623

if(ret == -1){

1624

perror_plus("seteuid");

1625

}

1626

1627

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

1628

int seckey_fd = open(seckey, O_RDONLY);

1629

if(seckey_fd == -1){

1630

perror_plus("open");

1631

} else {

1632

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

1633

if(ret == -1){

1634

perror_plus("fstat");

1635

} else {

1636

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

1637

ret = fchown(seckey_fd, uid, gid);

1638

if(ret == -1){

1639

perror_plus("fchown");

1640

}

1641

}

1642

}

1643

TEMP_FAILURE_RETRY(close(seckey_fd));

1644

}

1645

}

1646

1647

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

1648

int pubkey_fd = open(pubkey, O_RDONLY);

1649

if(pubkey_fd == -1){

1650

perror_plus("open");

1651

} else {

1652

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

1653

if(ret == -1){

1654

perror_plus("fstat");

1655

} else {

1656

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

1657

ret = fchown(pubkey_fd, uid, gid);

1658

if(ret == -1){

1659

perror_plus("fchown");

1660

}

1661

}

1662

}

1663

TEMP_FAILURE_RETRY(close(pubkey_fd));

1664

}

1665

}

1666

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

}

1674

1675

/* Find network hooks and run them */

1676

{

1677

struct dirent **direntries;

1678

struct dirent *direntry;

1679

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

1680

alphasort);

1681

if(numhooks == -1){

1682

perror_plus("scandir");

2071

1683

} else {

2072

struct stat st;

2073

2074

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

2075

int seckey_fd = open(seckey, O_RDONLY);

2076

if(seckey_fd == -1){

2077

perror_plus("open");

2078

} else {

2079

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

2080

if(ret == -1){

2081

perror_plus("fstat");

2082

} else {

2083

if(S_ISREG(st.st_mode)

2084

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

2085

ret = fchown(seckey_fd, uid, gid);

2086

if(ret == -1){

2087

perror_plus("fchown");

2088

}

2089

}

2090

}

2091

TEMP_FAILURE_RETRY(close(seckey_fd));

2092

}

2093

}

2094

2095

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

2096

int pubkey_fd = open(pubkey, O_RDONLY);

2097

if(pubkey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(pubkey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(pubkey_fd));

2113

}

2114

}

2115

2116

/* Lower privileges */

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

2121

}

2122

}

2123

}

2124

2125

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

2126

{

2127

char *interface = NULL;

2128

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

2129

interface))){

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2133

fprintf_plus(stderr, "Not using nonexisting interface"

2134

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

2135

}

2136

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

2137

interface = NULL;

2138

}

2139

}

2140

}

2141

2142

/* Run network hooks */

2143

{

2144

if(mc.interfaces != NULL){

2145

interfaces_hooks = malloc(mc.interfaces_size);

2146

if(interfaces_hooks == NULL){

2147

perror_plus("malloc");

2148

goto end;

2149

}

2150

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

2151

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

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

1684

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

1685

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

1686

direntry = direntries[0];

1687

char *fullname = NULL;

1688

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

1689

if(ret < 0){

1690

perror_plus("asprintf");

1691

continue;

1692

}

1693

pid_t hook_pid = fork();

1694

if(hook_pid == 0){

1695

/* Child */

1696

dup2(devnull, STDIN_FILENO);

1697

close(devnull);

1698

dup2(STDERR_FILENO, STDOUT_FILENO);

1699

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

1700

if(ret == -1){

1701

perror_plus("setenv");

1702

exit(1);

1703

}

1704

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

1705

if(ret == -1){

1706

perror_plus("setenv");

1707

exit(1);

1708

}

1709

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

1710

if(ret == -1){

1711

perror_plus("setenv");

1712

exit(1);

1713

}

1714

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

1715

if(ret == -1){

1716

perror_plus("setenv");

1717

exit(1);

1718

}

1719

char *delaystring;

1720

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

1721

if(ret == -1){

1722

perror_plus("asprintf");

1723

exit(1);

1724

}

1725

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

1726

if(ret == -1){

1727

free(delaystring);

1728

perror_plus("setenv");

1729

exit(1);

1730

}

1731

free(delaystring);

1732

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

1733

perror_plus("execl");

1734

} else {

1735

int status;

1736

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

1737

perror_plus("waitpid");

1738

free(fullname);

1739

continue;

1740

}

1741

if(WIFEXITED(status)){

1742

if(WEXITSTATUS(status) != 0){

1743

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

1744

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

1745

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

1746

WEXITSTATUS(status));

1747

free(fullname);

1748

continue;

1749

}

1750

} else if(WIFSIGNALED(status)){

1751

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

1752

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

1753

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

1754

WTERMSIG(status));

1755

free(fullname);

1756

continue;

1757

} else {

1758

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

1759

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

1760

direntry->d_name);

1761

free(fullname);

1762

continue;

1763

}

1764

}

1765

free(fullname);

1766

if(quit_now){

1767

goto end;

1768

}

1769

}

1770

close(devnull);

1771

}

2155

1772

}

2156

1773

2157

1774

if(not debug){

2158

1775

avahi_set_log_function(empty_log);

2159

1776

}

2160

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

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

1795

}

1796

if(interface == NULL){

1797

perror_plus("malloc");

1798

free(direntries);

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

free(direntries);

1803

} else {

1804

free(direntries);

1805

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

1806

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

1807

exitcode = EXIT_FAILURE;

1808

goto end;

1809

}

1810

}

1811

2161

1812

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

2162

1813

from the signal handler */

2163

1814

/* Initialize the pseudo-RNG for Avahi */

2164

1815

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

2165

simple_poll = avahi_simple_poll_new();

2166

if(simple_poll == NULL){

2167

fprintf_plus(stderr,

2168

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

1816

mc.simple_poll = avahi_simple_poll_new();

1817

if(mc.simple_poll == NULL){

1818

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

1819

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

2169

1820

exitcode = EX_UNAVAILABLE;

2170

1821

goto end;

2171

1822

}

2233

1884

}

2234

1885

}

2235

1886

2236

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

2237

if(mc.interfaces == NULL){

2238

struct dirent **direntries;

2239

/* Look for any good interfaces */

2240

ret = scandir(sys_class_net, &direntries, good_interface,

2241

alphasort);

2242

if(ret >= 1){

2243

/* Add all found interfaces to interfaces list */

2244

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

2245

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

2246

direntries[i]->d_name);

2247

if(ret_errno != 0){

2248

errno = ret_errno;

2249

perror_plus("argz_add");

2250

continue;

2251

}

2252

if(debug){

2253

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

2254

direntries[i]->d_name);

2255

}

2256

}

2257

free(direntries);

1887

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

1888

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

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1890

if(if_index == 0){

1891

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

1892

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

1893

exitcode = EX_UNAVAILABLE;

1894

goto end;

1895

}

1896

1897

if(quit_now){

1898

goto end;

1899

}

1900

1901

/* Re-raise priviliges */

1902

errno = 0;

1903

ret = seteuid(0);

1904

if(ret == -1){

1905

perror_plus("seteuid");

1906

}

1907

1908

#ifdef __linux__

1909

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1910

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

1911

ret = klogctl(8, NULL, 5);

1912

bool restore_loglevel = true;

1913

if(ret == -1){

1914

restore_loglevel = false;

1915

perror_plus("klogctl");

1916

}

1917

#endif /* __linux__ */

1918

1919

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1920

if(sd < 0){

1921

perror_plus("socket");

1922

exitcode = EX_OSERR;

1923

#ifdef __linux__

1924

if(restore_loglevel){

1925

ret = klogctl(7, NULL, 0);

1926

if(ret == -1){

1927

perror_plus("klogctl");

1928

}

1929

}

1930

#endif /* __linux__ */

1931

/* Lower privileges */

1932

errno = 0;

1933

ret = seteuid(uid);

1934

if(ret == -1){

1935

perror_plus("seteuid");

1936

}

1937

goto end;

1938

}

1939

strcpy(network.ifr_name, interface);

1940

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

1941

if(ret == -1){

1942

perror_plus("ioctl SIOCGIFFLAGS");

1943

#ifdef __linux__

1944

if(restore_loglevel){

1945

ret = klogctl(7, NULL, 0);

1946

if(ret == -1){

1947

perror_plus("klogctl");

1948

}

1949

}

1950

#endif /* __linux__ */

1951

exitcode = EX_OSERR;

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

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

1961

network.ifr_flags |= IFF_UP;

1962

take_down_interface = true;

1963

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

1964

if(ret == -1){

1965

take_down_interface = false;

1966

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1967

exitcode = EX_OSERR;

1968

#ifdef __linux__

1969

if(restore_loglevel){

1970

ret = klogctl(7, NULL, 0);

1971

if(ret == -1){

1972

perror_plus("klogctl");

1973

}

1974

}

1975

#endif /* __linux__ */

1976

/* Lower privileges */

1977

errno = 0;

1978

ret = seteuid(uid);

1979

if(ret == -1){

1980

perror_plus("seteuid");

1981

}

1982

goto end;

1983

}

1984

}

1985

/* Sleep checking until interface is running.

1986

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

1987

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

1988

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

1989

if(ret == -1){

1990

perror_plus("ioctl SIOCGIFFLAGS");

1991

} else if(network.ifr_flags & IFF_RUNNING){

1992

break;

1993

}

1994

struct timespec sleeptime = { .tv_nsec = 250000000 };

1995

ret = nanosleep(&sleeptime, NULL);

1996

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

1997

perror_plus("nanosleep");

1998

}

1999

}

2000

if(not take_down_interface){

2001

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

2002

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

2003

if(ret == -1){

2004

perror_plus("close");

2005

}

2006

}

2007

#ifdef __linux__

2008

if(restore_loglevel){

2009

/* Restores kernel loglevel to default */

2010

ret = klogctl(7, NULL, 0);

2011

if(ret == -1){

2012

perror_plus("klogctl");

2013

}

2014

}

2015

#endif /* __linux__ */

2016

/* Lower privileges */

2017

errno = 0;

2018

if(take_down_interface){

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2258

2024

} else {

2259

free(direntries);

2260

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

2261

exitcode = EXIT_FAILURE;

2262

goto end;

2263

}

2264

}

2265

2266

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

2267

{

2268

char *interface = NULL;

2269

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

2270

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2287

bool interface_was_up = interface_is_up(interface);

2288

errno = bring_up_interface(interface, delay);

2289

if(not interface_was_up){

2290

if(errno != 0){

2291

perror_plus("Failed to bring up interface");

2292

} else {

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2299

}

2300

}

2301

}

2302

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

2303

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

2304

}

2305

}

2306

2307

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

2308

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

2309

if(debug){

2310

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

2311

mc.interfaces);

2312

}

2313

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

2025

/* Lower privileges permanently */

2026

ret = setuid(uid);

2027

if(ret == -1){

2028

perror_plus("setuid");

2029

}

2030

}

2314

2031

}

2315

2032

2316

2033

if(quit_now){

2317

2034

goto end;

2318

2035

}

2319

2036

2320

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

2037

ret = init_gnutls_global(pubkey, seckey);

2321

2038

if(ret == -1){

2322

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

2039

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

2040

"init_gnutls_global failed\n");

2323

2041

exitcode = EX_UNAVAILABLE;

2324

2042

goto end;

2325

2043

} else {

2330

2048

goto end;

2331

2049

}

2332

2050

2333

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

2334

tempdir = mkdtemp(run_tempdir);

2335

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

2336

if(debug){

2337

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

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

2051

if(mkdtemp(tempdir) == NULL){

2343

2052

perror_plus("mkdtemp");

2344

2053

goto end;

2345

2054

}

2055

tempdir_created = true;

2346

2056

2347

2057

if(quit_now){

2348

2058

goto end;

2349

2059

}

2350

2060

2351

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

2352

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

2061

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

2062

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

2063

"init_gpgme failed\n");

2353

2064

exitcode = EX_UNAVAILABLE;

2354

2065

goto end;

2355

2066

} else {

2364

2075

/* Connect directly, do not use Zeroconf */

2365

2076

/* (Mainly meant for debugging) */

2366

2077

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

2367

2368

2078

if(address == NULL){

2369

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

2079

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

2080

"No colon in address\n");

2370

2081

exitcode = EX_USAGE;

2371

2082

goto end;

2372

2083

}

2375

2086

goto end;

2376

2087

}

2377

2088

2378

in_port_t port;

2089

uint16_t port;

2379

2090

errno = 0;

2380

2091

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

2381

2092

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

2382

or tmpmax != (in_port_t)tmpmax){

2383

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

2093

or tmpmax != (uint16_t)tmpmax){

2094

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

2095

"Bad port number\n");

2384

2096

exitcode = EX_USAGE;

2385

2097

goto end;

2386

2098

}

2387

2099

2388

2100

if(quit_now){

2389

2101

goto end;

2390

2102

}

2391

2103

2392

port = (in_port_t)tmpmax;

2104

port = (uint16_t)tmpmax;

2393

2105

*address = '\0';

2394

2106

/* Colon in address indicates IPv6 */

2395

2107

int af;

2411

2123

}

2412

2124

2413

2125

while(not quit_now){

2414

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

2415

&mc);

2126

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

2416

2127

if(quit_now or ret == 0){

2417

2128

break;

2418

2129

}

2419

2130

if(debug){

2420

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

2421

(int)retry_interval);

2131

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

2132

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

2422

2133

}

2423

sleep((unsigned int)retry_interval);

2134

sleep((int)retry_interval);

2424

2135

}

2425

2136

2426

if(not quit_now){

2137

if (not quit_now){

2427

2138

exitcode = EXIT_SUCCESS;

2428

2139

}

2429

2140

2444

2155

config.publish_domain = 0;

2445

2156

2446

2157

/* Allocate a new server */

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2448

&config, NULL, NULL, &ret_errno);

2158

mc.server = avahi_server_new(avahi_simple_poll_get

2159

(mc.simple_poll), &config, NULL,

2160

NULL, &error);

2449

2161

2450

2162

/* Free the Avahi configuration data */

2451

2163

avahi_server_config_free(&config);

2453

2165

2454

2166

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

2455

2167

if(mc.server == NULL){

2456

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

2457

avahi_strerror(ret_errno));

2168

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

2169

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

2170

avahi_strerror(error));

2458

2171

exitcode = EX_UNAVAILABLE;

2459

2172

goto end;

2460

2173

}

2466

2179

/* Create the Avahi service browser */

2467

2180

sb = avahi_s_service_browser_new(mc.server, if_index,

2468

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2469

NULL, 0, browse_callback,

2470

(void *)&mc);

2182

NULL, 0, browse_callback, NULL);

2471

2183

if(sb == NULL){

2472

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

2473

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

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

2186

avahi_strerror(avahi_server_errno(mc.server)));

2474

2187

exitcode = EX_UNAVAILABLE;

2475

2188

goto end;

2476

2189

}

2482

2195

/* Run the main loop */

2483

2196

2484

2197

if(debug){

2485

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

2198

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

2199

"Starting Avahi loop search\n");

2486

2200

}

2487

2201

2488

ret = avahi_loop_with_timeout(simple_poll,

2489

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

2202

ret = avahi_loop_with_timeout(mc.simple_poll,

2203

(int)(retry_interval * 1000));

2490

2204

if(debug){

2491

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

2492

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

2205

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

2206

"avahi_loop_with_timeout exited %s\n",

2207

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

2493

2208

}

2494

2209

2495

2210

end:

2496

2211

2497

2212

if(debug){

2498

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

2213

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

2214

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

2499

2215

}

2500

2216

2501

2217

/* Cleanup things */

2502

free(mc.interfaces);

2503

2504

2218

if(sb != NULL)

2505

2219

avahi_s_service_browser_free(sb);

2506

2220

2507

2221

if(mc.server != NULL)

2508

2222

avahi_server_free(mc.server);

2509

2223

2510

if(simple_poll != NULL)

2511

avahi_simple_poll_free(simple_poll);

2224

if(mc.simple_poll != NULL)

2225

avahi_simple_poll_free(mc.simple_poll);

2512

2226

2513

2227

if(gnutls_initialized){

2514

2228

gnutls_certificate_free_credentials(mc.cred);

2519

2233

if(gpgme_initialized){

2520

2234

gpgme_release(mc.ctx);

2521

2235

}

2522

2236

2523

2237

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

2524

2238

has seen */

2525

2239

if(mc.current_server != NULL){

2531

2245

}

2532

2246

}

2533

2247

2534

/* Re-raise privileges */

2535

{

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2248

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

2249

2250

/* Take down the network interface */

2251

if(take_down_interface){

2252

/* Re-raise priviliges */

2253

errno = 0;

2254

ret = seteuid(0);

2255

if(ret == -1){

2256

perror_plus("seteuid");

2562

2257

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2258

if(geteuid() == 0){

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCGIFFLAGS");

2262

} else if(network.ifr_flags & IFF_UP){

2263

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

2264

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

2265

if(ret == -1){

2266

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2267

}

2268

}

2269

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

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2566

2279

}

2567

2280

}

2568

2281

2569

free(interfaces_to_take_down);

2570

free(interfaces_hooks);

2571

2572

2282

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

2573

if(tempdir != NULL){

2283

if(tempdir_created){

2574

2284

struct dirent **direntries = NULL;

2575

2285

struct dirent *direntry = NULL;

2576

2286

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

2577

2287

alphasort);

2578

if(numentries > 0){

2288

if (numentries > 0){

2579

2289

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

2580

2290

direntry = direntries[i];

2581

2291

char *fullname = NULL;

2587

2297

}

2588

2298

ret = remove(fullname);

2589

2299

if(ret == -1){

2590

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

2591

strerror(errno));

2300

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

2301

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

2592

2302

}

2593

2303

free(fullname);

2594

2304

}

2596

2306

2597

2307

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

2598

2308

free(direntries);

2599

if(numentries == -1){

2309

if (numentries == -1){

2600

2310

perror_plus("scandir");

2601

2311

}

2602

2312

ret = rmdir(tempdir);