/mandos/release : revision 237.2.182

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

73

72

*/

74

73

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

75

74

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

76

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

77

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

75

setgid(), pause() */

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

87

92

88

#ifdef __linux__

93

89

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

111

107

init_gnutls_session(),

112

108

GNUTLS_* */

113

109

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

116

112

117

113

/* GPGME */

118

114

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

126

122

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

127

123

#define SECKEY "seckey.txt"

128

124

#define PUBKEY "pubkey.txt"

129

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

130

125

131

126

bool debug = false;

132

127

static const char mandos_protocol_version[] = "1";

133

128

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

134

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

129

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

135

130

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

136

131

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

143

AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

149

132

150

133

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

151

134

typedef struct {

156

139

gnutls_dh_params_t dh_params;

157

140

const char *priority;

158

141

gpgme_ctx_t ctx;

159

server *current_server;

160

142

} mandos_context;

161

143

162

144

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

163

145

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

164

146

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

147

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

167

148

168

149

sig_atomic_t quit_now = 0;

169

150

int signal_received = 0;

170

151

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

187

152

/*

188

153

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

189

154

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

190

155

* "buffer_length" is how much is already used.

191

156

*/

192

157

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

158

size_t buffer_capacity){

194

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

160

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

196

161

if(buffer == NULL){

201

166

return buffer_capacity;

202

167

}

203

168

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

241

169

/*

242

170

* Initialize GPGME.

243

171

*/

244

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

245

const char *tempdir){

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

246

174

gpgme_error_t rc;

247

175

gpgme_engine_info_t engine_info;

248

176

257

185

258

186

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

259

187

if(fd == -1){

260

perror_plus("open");

188

perror("open");

261

189

return false;

262

190

}

263

191

264

192

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

193

if(rc != GPG_ERR_NO_ERROR){

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

268

196

return false;

269

197

}

270

198

271

199

rc = gpgme_op_import(mc.ctx, pgp_data);

272

200

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

275

203

return false;

276

204

}

277

205

278

206

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

279

207

if(ret == -1){

280

perror_plus("close");

208

perror("close");

281

209

}

282

210

gpgme_data_release(pgp_data);

283

211

return true;

284

212

}

285

213

286

214

if(debug){

287

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

215

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

288

216

}

289

217

290

218

/* Init GPGME */

291

219

gpgme_check_version(NULL);

292

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

221

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

296

224

return false;

297

225

}

298

226

299

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

227

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

300

228

rc = gpgme_get_engine_info(&engine_info);

301

229

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

304

232

return false;

305

233

}

306

234

while(engine_info != NULL){

312

240

engine_info = engine_info->next;

313

241

}

314

242

if(engine_info == NULL){

315

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

316

tempdir);

243

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

317

244

return false;

318

245

}

319

246

320

247

/* Create new GPGME "context" */

321

248

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

322

249

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

326

252

return false;

327

253

}

328

254

347

273

ssize_t plaintext_length = 0;

348

274

349

275

if(debug){

350

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

276

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

351

277

}

352

278

353

279

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

354

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

281

0);

356

282

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

359

285

return -1;

360

286

}

361

287

362

288

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

363

289

rc = gpgme_data_new(&dh_plain);

364

290

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

368

293

gpgme_data_release(dh_crypto);

369

294

return -1;

370

295

}

373

298

data buffer */

374

299

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

375

300

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

378

303

plaintext_length = -1;

379

304

if(debug){

380

305

gpgme_decrypt_result_t result;

381

306

result = gpgme_op_decrypt_result(mc.ctx);

382

307

if(result == NULL){

383

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

308

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

384

309

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

389

314

if(result->file_name != NULL){

390

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

315

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

391

316

}

392

317

gpgme_recipient_t recipient;

393

318

recipient = result->recipients;

394

319

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

402

326

recipient = recipient->next;

403

327

}

404

328

}

407

331

}

408

332

409

333

if(debug){

410

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

334

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

411

335

}

412

336

413

337

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

414

338

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

415

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

416

340

plaintext_length = -1;

417

341

goto decrypt_end;

418

342

}

420

344

*plaintext = NULL;

421

345

while(true){

422

346

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

425

349

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

429

353

}

430

354

431

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

360

break;

437

361

}

438

362

if(ret < 0){

439

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

440

364

plaintext_length = -1;

441

365

goto decrypt_end;

442

366

}

444

368

}

445

369

446

370

if(debug){

447

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

371

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

448

372

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

449

373

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

450

374

}

472

396

/* GnuTLS log function callback */

473

397

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

474

398

const char* string){

475

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

399

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

476

400

}

477

401

478

402

static int init_gnutls_global(const char *pubkeyfilename,

480

404

int ret;

481

405

482

406

if(debug){

483

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

407

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

484

408

}

485

409

486

410

ret = gnutls_global_init();

487

411

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

490

414

return -1;

491

415

}

492

416

499

423

}

500

424

501

425

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

503

427

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

506

433

gnutls_global_deinit();

507

434

return -1;

508

435

}

509

436

510

437

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

438

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

439

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

440

seckeyfilename);

515

441

}

516

442

517

443

ret = gnutls_certificate_set_openpgp_key_file

518

444

(mc.cred, pubkeyfilename, seckeyfilename,

519

445

GNUTLS_OPENPGP_FMT_BASE64);

520

446

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

526

452

goto globalfail;

527

453

}

528

454

529

455

/* GnuTLS server initialization */

530

456

ret = gnutls_dh_params_init(&mc.dh_params);

531

457

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

458

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

459

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

535

460

goto globalfail;

536

461

}

537

462

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

538

463

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

541

466

goto globalfail;

542

467

}

543

468

563

488

}

564

489

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

565

490

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

569

493

}

570

494

571

495

{

578

502

}

579

503

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

580

504

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

584

508

gnutls_deinit(*session);

585

509

return -1;

586

510

}

595

519

}

596

520

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

597

521

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

600

524

gnutls_deinit(*session);

601

525

return -1;

602

526

}

647

571

pf = PF_INET;

648

572

break;

649

573

default:

650

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

574

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

651

575

errno = EINVAL;

652

576

return -1;

653

577

}

658

582

}

659

583

660

584

if(debug){

661

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

662

PRIu16 "\n", ip, port);

585

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

586

"\n", ip, port);

663

587

}

664

588

665

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

590

if(tcp_sd < 0){

667

591

int e = errno;

668

perror_plus("socket");

592

perror("socket");

669

593

errno = e;

670

594

goto mandos_end;

671

595

}

685

609

}

686

610

if(ret < 0 ){

687

611

int e = errno;

688

perror_plus("inet_pton");

612

perror("inet_pton");

689

613

errno = e;

690

614

goto mandos_end;

691

615

}

692

616

if(ret == 0){

693

617

int e = errno;

694

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

618

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

695

619

errno = e;

696

620

goto mandos_end;

697

621

}

702

626

703

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

628

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

705

-Wunreachable-code*/

629

-Wunreachable-code*/

706

630

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

709

633

errno = EINVAL;

710

634

goto mandos_end;

711

635

}

727

651

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

728

652

char interface[IF_NAMESIZE];

729

653

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

730

perror_plus("if_indextoname");

654

perror("if_indextoname");

731

655

} else {

732

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

733

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

656

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

657

ip, interface, port);

734

658

}

735

659

} else {

736

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

737

ip, port);

660

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

661

port);

738

662

}

739

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

747

671

sizeof(addrstr));

748

672

}

749

673

if(pcret == NULL){

750

perror_plus("inet_ntop");

674

perror("inet_ntop");

751

675

} else {

752

676

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

753

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

677

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

754

678

}

755

679

}

756

680

}

766

690

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

767

691

}

768

692

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

693

int e = errno;

694

perror("connect");

695

errno = e;

774

696

goto mandos_end;

775

697

}

776

698

784

706

while(true){

785

707

size_t out_size = strlen(out);

786

708

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

787

out_size - written));

709

out_size - written));

788

710

if(ret == -1){

789

711

int e = errno;

790

perror_plus("write");

712

perror("write");

791

713

errno = e;

792

714

goto mandos_end;

793

715

}

810

732

}

811

733

812

734

if(debug){

813

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

735

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

814

736

}

815

737

816

738

if(quit_now){

818

740

goto mandos_end;

819

741

}

820

742

821

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

822

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

744

824

745

if(quit_now){

836

757

837

758

if(ret != GNUTLS_E_SUCCESS){

838

759

if(debug){

839

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

760

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

840

761

gnutls_perror(ret);

841

762

}

842

763

errno = EPROTO;

846

767

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

847

768

848

769

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

770

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

771

ip);

851

772

}

852

773

853

774

while(true){

858

779

}

859

780

860

781

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

782

buffer_capacity);

862

783

if(buffer_capacity == 0){

863

784

int e = errno;

864

perror_plus("incbuffer");

785

perror("incbuffer");

865

786

errno = e;

866

787

goto mandos_end;

867

788

}

891

812

}

892

813

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

893

814

if(ret < 0){

894

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

895

"***\n");

815

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

896

816

gnutls_perror(ret);

897

817

errno = EPROTO;

898

818

goto mandos_end;

899

819

}

900

820

break;

901

821

default:

902

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

903

" encrypted session with Mandos server\n");

822

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

823

" encrypted session with Mandos server\n");

904

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

825

errno = EIO;

906

826

goto mandos_end;

911

831

}

912

832

913

833

if(debug){

914

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

834

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

915

835

}

916

836

917

837

if(quit_now){

929

849

930

850

if(buffer_length > 0){

931

851

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

933

854

&decrypted_buffer);

934

855

if(decrypted_buffer_size >= 0){

935

856

946

867

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

947

868

int e = errno;

948

869

if(debug){

949

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

950

strerror(errno));

870

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

871

strerror(errno));

951

872

}

952

873

errno = e;

953

874

goto mandos_end;

972

893

if(e == 0){

973

894

e = errno;

974

895

}

975

perror_plus("close");

896

perror("close");

976

897

}

977

898

gnutls_deinit(session);

978

errno = e;

979

899

if(quit_now){

980

errno = EINTR;

900

e = EINTR;

981

901

retval = -1;

982

902

}

903

errno = e;

983

904

}

984

905

return retval;

985

906

}

1010

931

switch(event){

1011

932

default:

1012

933

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

934

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

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1017

937

break;

1018

938

1019

939

case AVAHI_RESOLVER_FOUND:

1021

941

char ip[AVAHI_ADDRESS_STR_MAX];

1022

942

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

1023

943

if(debug){

1024

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

1025

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

1026

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

944

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

945

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

946

ip, (intmax_t)interface, port);

1027

947

}

1028

948

int ret = start_mandos_communication(ip, port, interface,

1029

949

avahi_proto_to_af(proto));

1030

950

if(ret == 0){

1031

951

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1035

952

}

1036

953

}

1037

954

}

1061

978

default:

1062

979

case AVAHI_BROWSER_FAILURE:

1063

980

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1066

983

avahi_simple_poll_quit(mc.simple_poll);

1067

984

return;

1068

985

1075

992

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

1076

993

name, type, domain, protocol, 0,

1077

994

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

995

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

996

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

1081

997

break;

1082

998

1083

999

case AVAHI_BROWSER_REMOVE:

1086

1002

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

1003

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

1004

if(debug){

1089

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

1090

" searching...\n");

1005

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

1091

1006

}

1092

1007

break;

1093

1008

}

1094

1009

}

1095

1010

1096

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

1011

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

1097

1012

static void handle_sigterm(int sig){

1098

1013

if(quit_now){

1099

1014

return;

1101

1016

quit_now = 1;

1102

1017

signal_received = sig;

1103

1018

int old_errno = errno;

1104

/* set main loop to exit */

1105

1019

if(mc.simple_poll != NULL){

1106

1020

avahi_simple_poll_quit(mc.simple_poll);

1107

1021

}

1108

1022

errno = old_errno;

1109

1023

}

1110

1024

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1048

/* read line from flags_fd */

1049

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1050

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1051

flagstring[(size_t)to_read] = '\0';

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

tmpmax = strtoimax(flagstring, &tmp, 0);

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1122

1079

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1080

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1081

flagstring, if_entry->d_name);

1124

1082

}

1125

return false;

1083

free(flagstring);

1084

return 0;

1126

1085

}

1127

return true;

1128

}

1129

1130

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

1131

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1132

1088

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1089

if(flags & IFF_LOOPBACK){

1134

1090

if(debug){

1135

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

1136

ifname);

1091

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

1092

if_entry->d_name);

1137

1093

}

1138

return false;

1094

return 0;

1139

1095

}

1140

1096

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

1141

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

1097

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1142

1098

if(debug){

1143

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

1144

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

1099

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

1100

if_entry->d_name);

1145

1101

}

1146

return true;

1102

return 1;

1147

1103

}

1148

1104

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1165

1112

/* Accept this device */

1166

1113

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1114

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1115

if_entry->d_name);

1116

}

1117

return 1;

1509

1118

}

1510

1119

1511

1120

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

1530

1139

bool gnutls_initialized = false;

1531

1140

bool gpgme_initialized = false;

1532

1141

float delay = 2.5f;

1533

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

1534

retrying the same server again */

1535

1142

1536

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1537

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1543

1150

errno = 0;

1544

1151

ret = setgid(gid);

1545

1152

if(ret == -1){

1546

perror_plus("setgid");

1153

perror("setgid");

1547

1154

}

1548

1155

1549

1156

/* Lower user privileges (temporarily) */

1550

1157

errno = 0;

1551

1158

ret = seteuid(uid);

1552

1159

if(ret == -1){

1553

perror_plus("seteuid");

1160

perror("seteuid");

1554

1161

}

1555

1162

1556

1163

if(quit_now){

1591

1198

.arg = "SECONDS",

1592

1199

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

1593

1200

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

1201

/*

1603

1202

* These reproduce what we would get without ARGP_NO_HELP

1604

1203

*/

1648

1247

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

1649

1248

argp_error(state, "Bad delay");

1650

1249

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

1250

break;

1663

1251

/*

1664

1252

* These reproduce what we would get without ARGP_NO_HELP

1671

1259

argp_state_help(state, state->out_stream,

1672

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1261

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1262

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

1677

1263

exit(argp_err_exit_status);

1678

1264

break;

1679

1265

default:

1694

1280

case ENOMEM:

1695

1281

default:

1696

1282

errno = ret;

1697

perror_plus("argp_parse");

1283

perror("argp_parse");

1698

1284

exitcode = EX_OSERR;

1699

1285

goto end;

1700

1286

case EINVAL:

1702

1288

goto end;

1703

1289

}

1704

1290

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1772

}

1773

1291

1774

1292

if(not debug){

1775

1293

avahi_set_log_function(empty_log);

1776

1294

}

1777

1295

1778

1296

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

1779

1297

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1782

1299

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

1300

if(ret >= 1){

1790

/* Pick the first interface returned */

1301

/* Pick the first good interface */

1791

1302

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

1792

1303

if(debug){

1793

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

1304

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

1794

1305

}

1795

1306

if(interface == NULL){

1796

perror_plus("malloc");

1307

perror("malloc");

1797

1308

free(direntries);

1798

1309

exitcode = EXIT_FAILURE;

1799

1310

goto end;

1801

1312

free(direntries);

1802

1313

} else {

1803

1314

free(direntries);

1804

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

1315

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

1805

1316

exitcode = EXIT_FAILURE;

1806

1317

goto end;

1807

1318

}

1813

1324

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

1814

1325

mc.simple_poll = avahi_simple_poll_new();

1815

1326

if(mc.simple_poll == NULL){

1816

fprintf_plus(stderr,

1817

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

1327

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

1818

1328

exitcode = EX_UNAVAILABLE;

1819

1329

goto end;

1820

1330

}

1822

1332

sigemptyset(&sigterm_action.sa_mask);

1823

1333

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

1824

1334

if(ret == -1){

1825

perror_plus("sigaddset");

1335

perror("sigaddset");

1826

1336

exitcode = EX_OSERR;

1827

1337

goto end;

1828

1338

}

1829

1339

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

1830

1340

if(ret == -1){

1831

perror_plus("sigaddset");

1341

perror("sigaddset");

1832

1342

exitcode = EX_OSERR;

1833

1343

goto end;

1834

1344

}

1835

1345

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

1836

1346

if(ret == -1){

1837

perror_plus("sigaddset");

1347

perror("sigaddset");

1838

1348

exitcode = EX_OSERR;

1839

1349

goto end;

1840

1350

}

1844

1354

*/

1845

1355

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

1846

1356

if(ret == -1){

1847

perror_plus("sigaction");

1357

perror("sigaction");

1848

1358

return EX_OSERR;

1849

1359

}

1850

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

1361

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

1852

1362

if(ret == -1){

1853

perror_plus("sigaction");

1363

perror("sigaction");

1854

1364

exitcode = EX_OSERR;

1855

1365

goto end;

1856

1366

}

1857

1367

}

1858

1368

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

1859

1369

if(ret == -1){

1860

perror_plus("sigaction");

1370

perror("sigaction");

1861

1371

return EX_OSERR;

1862

1372

}

1863

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

1374

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

1865

1375

if(ret == -1){

1866

perror_plus("sigaction");

1376

perror("sigaction");

1867

1377

exitcode = EX_OSERR;

1868

1378

goto end;

1869

1379

}

1870

1380

}

1871

1381

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

1872

1382

if(ret == -1){

1873

perror_plus("sigaction");

1383

perror("sigaction");

1874

1384

return EX_OSERR;

1875

1385

}

1876

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

1387

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

1878

1388

if(ret == -1){

1879

perror_plus("sigaction");

1389

perror("sigaction");

1880

1390

exitcode = EX_OSERR;

1881

1391

goto end;

1882

1392

}

1886

1396

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

1887

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

1398

if(if_index == 0){

1889

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

1399

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

1890

1400

exitcode = EX_UNAVAILABLE;

1891

1401

goto end;

1892

1402

}

1899

1409

errno = 0;

1900

1410

ret = seteuid(0);

1901

1411

if(ret == -1){

1902

perror_plus("seteuid");

1412

perror("seteuid");

1903

1413

}

1904

1414

1905

1415

#ifdef __linux__

1909

1419

bool restore_loglevel = true;

1910

1420

if(ret == -1){

1911

1421

restore_loglevel = false;

1912

perror_plus("klogctl");

1422

perror("klogctl");

1913

1423

}

1914

1424

#endif /* __linux__ */

1915

1425

1916

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

1427

if(sd < 0){

1918

perror_plus("socket");

1428

perror("socket");

1919

1429

exitcode = EX_OSERR;

1920

1430

#ifdef __linux__

1921

1431

if(restore_loglevel){

1922

1432

ret = klogctl(7, NULL, 0);

1923

1433

if(ret == -1){

1924

perror_plus("klogctl");

1434

perror("klogctl");

1925

1435

}

1926

1436

}

1927

1437

#endif /* __linux__ */

1929

1439

errno = 0;

1930

1440

ret = seteuid(uid);

1931

1441

if(ret == -1){

1932

perror_plus("seteuid");

1442

perror("seteuid");

1933

1443

}

1934

1444

goto end;

1935

1445

}

1936

1446

strcpy(network.ifr_name, interface);

1937

1447

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

1938

1448

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1449

perror("ioctl SIOCGIFFLAGS");

1940

1450

#ifdef __linux__

1941

1451

if(restore_loglevel){

1942

1452

ret = klogctl(7, NULL, 0);

1943

1453

if(ret == -1){

1944

perror_plus("klogctl");

1454

perror("klogctl");

1945

1455

}

1946

1456

}

1947

1457

#endif /* __linux__ */

1950

1460

errno = 0;

1951

1461

ret = seteuid(uid);

1952

1462

if(ret == -1){

1953

perror_plus("seteuid");

1463

perror("seteuid");

1954

1464

}

1955

1465

goto end;

1956

1466

}

1960

1470

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

1961

1471

if(ret == -1){

1962

1472

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1964

1474

exitcode = EX_OSERR;

1965

1475

#ifdef __linux__

1966

1476

if(restore_loglevel){

1967

1477

ret = klogctl(7, NULL, 0);

1968

1478

if(ret == -1){

1969

perror_plus("klogctl");

1479

perror("klogctl");

1970

1480

}

1971

1481

}

1972

1482

#endif /* __linux__ */

1974

1484

errno = 0;

1975

1485

ret = seteuid(uid);

1976

1486

if(ret == -1){

1977

perror_plus("seteuid");

1487

perror("seteuid");

1978

1488

}

1979

1489

goto end;

1980

1490

}

1981

1491

}

1982

/* Sleep checking until interface is running.

1983

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

1492

/* sleep checking until interface is running */

1984

1493

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

1985

1494

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

1986

1495

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1496

perror("ioctl SIOCGIFFLAGS");

1988

1497

} else if(network.ifr_flags & IFF_RUNNING){

1989

1498

break;

1990

1499

}

1991

1500

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

1501

ret = nanosleep(&sleeptime, NULL);

1993

1502

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

1994

perror_plus("nanosleep");

1503

perror("nanosleep");

1995

1504

}

1996

1505

}

1997

1506

if(not take_down_interface){

1998

1507

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

1999

1508

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

2000

1509

if(ret == -1){

2001

perror_plus("close");

1510

perror("close");

2002

1511

}

2003

1512

}

2004

1513

#ifdef __linux__

2006

1515

/* Restores kernel loglevel to default */

2007

1516

ret = klogctl(7, NULL, 0);

2008

1517

if(ret == -1){

2009

perror_plus("klogctl");

1518

perror("klogctl");

2010

1519

}

2011

1520

}

2012

1521

#endif /* __linux__ */

2013

1522

/* Lower privileges */

2014

1523

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

2019

1536

}

2020

1537

}

2021

1538

2025

1542

2026

1543

ret = init_gnutls_global(pubkey, seckey);

2027

1544

if(ret == -1){

2028

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

1545

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

2029

1546

exitcode = EX_UNAVAILABLE;

2030

1547

goto end;

2031

1548

} else {

2036

1553

goto end;

2037

1554

}

2038

1555

1556

tempdir_created = true;

2039

1557

if(mkdtemp(tempdir) == NULL){

2040

perror_plus("mkdtemp");

1558

tempdir_created = false;

1559

perror("mkdtemp");

2041

1560

goto end;

2042

1561

}

2043

tempdir_created = true;

2044

1562

2045

1563

if(quit_now){

2046

1564

goto end;

2047

1565

}

2048

1566

2049

1567

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

2050

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

1568

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

2051

1569

exitcode = EX_UNAVAILABLE;

2052

1570

goto end;

2053

1571

} else {

2063

1581

/* (Mainly meant for debugging) */

2064

1582

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

2065

1583

if(address == NULL){

2066

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

1584

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

2067

1585

exitcode = EX_USAGE;

2068

1586

goto end;

2069

1587

}

2077

1595

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

2078

1596

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

2079

1597

or tmpmax != (uint16_t)tmpmax){

2080

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

1598

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

2081

1599

exitcode = EX_USAGE;

2082

1600

goto end;

2083

1601

}

2088

1606

2089

1607

port = (uint16_t)tmpmax;

2090

1608

*address = '\0';

1609

address = connect_to;

2091

1610

/* Colon in address indicates IPv6 */

2092

1611

int af;

2093

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

1612

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

2094

1613

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

2101

1614

} else {

2102

1615

af = AF_INET;

2103

1616

}

2104

address = connect_to;

2105

1617

2106

1618

if(quit_now){

2107

1619

goto end;

2108

1620

}

2109

1621

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1643

} else {

2123

1644

exitcode = EXIT_SUCCESS;

2124

1645

}

2125

2126

1646

goto end;

2127

1647

}

2128

1648

2150

1670

2151

1671

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

2152

1672

if(mc.server == NULL){

2153

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

2154

avahi_strerror(error));

1673

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

1674

avahi_strerror(error));

2155

1675

exitcode = EX_UNAVAILABLE;

2156

1676

goto end;

2157

1677

}

2165

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

1686

NULL, 0, browse_callback, NULL);

2167

1687

if(sb == NULL){

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2170

1690

exitcode = EX_UNAVAILABLE;

2171

1691

goto end;

2172

1692

}

2178

1698

/* Run the main loop */

2179

1699

2180

1700

if(debug){

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2190

1705

2191

1706

end:

2192

1707

2193

1708

if(debug){

2194

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

1709

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

2195

1710

}

2196

1711

2197

1712

/* Cleanup things */

2214

1729

gpgme_release(mc.ctx);

2215

1730

}

2216

1731

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2233

1735

errno = 0;

2234

1736

ret = seteuid(0);

2235

1737

if(ret == -1){

2236

perror_plus("seteuid");

1738

perror("seteuid");

2237

1739

}

2238

2239

/* Take down the network interface */

2240

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

1740

if(geteuid() == 0){

2241

1741

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

2242

1742

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2245

1745

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

2246

1746

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

2247

1747

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2249

1749

}

2250

1750

}

2251

1751

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

2252

1752

if(ret == -1){

2253

perror_plus("close");

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2254

1760

}

2255

1761

}

2256

1762

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

1763

2264

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

1764

/* Removes the temp directory used by GPGME */

2265

1765

if(tempdir_created){

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

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

1782

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

1783

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

1784

continue;

1785

}

2273

1786

char *fullname = NULL;

2274

1787

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

2275

1788

direntry->d_name);

2276

1789

if(ret < 0){

2277

perror_plus("asprintf");

1790

perror("asprintf");

2278

1791

continue;

2279

1792

}

2280

1793

ret = remove(fullname);

2281

1794

if(ret == -1){

2282

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

2283

strerror(errno));

1795

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

1796

strerror(errno));

2284

1797

}

2285

1798

free(fullname);

2286

1799

}

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1800

closedir(d);

2293

1801

}

2294

1802

ret = rmdir(tempdir);

2295

1803

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

2296

perror_plus("rmdir");

1804

perror("rmdir");

2297

1805

}

2298

1806

}

2299

1807

2304

1812

&old_sigterm_action,

2305

1813

NULL));

2306

1814

if(ret == -1){

2307

perror_plus("sigaction");

1815

perror("sigaction");

2308

1816

}

2309

1817

do {

2310

1818

ret = raise(signal_received);

2311

1819

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

2312

1820

if(ret != 0){

2313

perror_plus("raise");

1821

perror("raise");

2314

1822

abort();

2315

1823

}

2316

1824

TEMP_FAILURE_RETRY(pause());