/mandos/release : revision 237.2.132

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() */

43

stdout, ferror(), remove() */

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() */

46

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

47

srand(), strtof() */

48

#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

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,

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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,

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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,

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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() */

77

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

75

setgid() */

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,

83

82

#include <signal.h> /* sigemptyset(), sigaddset(),

84

83

sigaction(), SIGTERM, sig_atomic_t,

85

84

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

85

91

86

#ifdef __linux__

92

87

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

110

105

init_gnutls_session(),

111

106

GNUTLS_* */

112

107

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

115

110

116

111

/* GPGME */

117

112

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

125

120

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

126

121

#define SECKEY "seckey.txt"

127

122

#define PUBKEY "pubkey.txt"

128

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

129

123

130

124

bool debug = false;

131

125

static const char mandos_protocol_version[] = "1";

132

126

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

133

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

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

127

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

148

128

149

129

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

150

130

typedef struct {

155

135

gnutls_dh_params_t dh_params;

156

136

const char *priority;

157

137

gpgme_ctx_t ctx;

158

server *current_server;

159

138

} mandos_context;

160

139

161

140

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

162

141

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

163

142

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

166

167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

143

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

176

144

177

145

/*

178

146

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

180

148

* "buffer_length" is how much is already used.

181

149

*/

182

150

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

151

size_t buffer_capacity){

184

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

153

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

186

154

if(buffer == NULL){

191

159

return buffer_capacity;

192

160

}

193

161

194

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

195

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

196

int af){

197

int ret;

198

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

199

if(new_server == NULL){

200

perror_plus("malloc");

201

return -1;

202

}

203

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

207

if(new_server->ip == NULL){

208

perror_plus("strdup");

209

return -1;

210

}

211

/* Special case of first server */

212

if (mc.current_server == NULL){

213

new_server->next = new_server;

214

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

217

} else {

218

new_server->next = mc.current_server;

219

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

220

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

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

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

229

}

230

231

162

/*

232

163

* Initialize GPGME.

233

164

*/

234

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

235

const char *tempdir){

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

236

167

gpgme_error_t rc;

237

168

gpgme_engine_info_t engine_info;

238

169

247

178

248

179

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

249

180

if(fd == -1){

250

perror_plus("open");

181

perror("open");

251

182

return false;

252

183

}

253

184

254

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

186

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

187

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

258

188

gpgme_strsource(rc), gpgme_strerror(rc));

259

189

return false;

260

190

}

261

191

262

192

rc = gpgme_op_import(mc.ctx, pgp_data);

263

193

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

194

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

266

195

gpgme_strsource(rc), gpgme_strerror(rc));

267

196

return false;

268

197

}

269

198

270

199

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

271

200

if(ret == -1){

272

perror_plus("close");

201

perror("close");

273

202

}

274

203

gpgme_data_release(pgp_data);

275

204

return true;

276

205

}

277

206

278

207

if(debug){

279

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

280

"Initializing GPGME\n");

208

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

281

209

}

282

210

283

211

/* Init GPGME */

284

212

gpgme_check_version(NULL);

285

213

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

214

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

215

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

289

216

gpgme_strsource(rc), gpgme_strerror(rc));

290

217

return false;

291

218

}

292

219

293

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

220

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

294

221

rc = gpgme_get_engine_info(&engine_info);

295

222

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

223

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

298

224

gpgme_strsource(rc), gpgme_strerror(rc));

299

225

return false;

300

226

}

307

233

engine_info = engine_info->next;

308

234

}

309

235

if(engine_info == NULL){

310

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

311

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

236

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

312

237

return false;

313

238

}

314

239

315

240

/* Create new GPGME "context" */

316

241

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

317

242

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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

320

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

321

245

return false;

322

246

}

323

247

342

266

ssize_t plaintext_length = 0;

343

267

344

268

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

269

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

347

270

}

348

271

349

272

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

350

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

274

0);

352

275

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

276

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

355

277

gpgme_strsource(rc), gpgme_strerror(rc));

356

278

return -1;

357

279

}

359

281

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

360

282

rc = gpgme_data_new(&dh_plain);

361

283

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

284

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

364

285

gpgme_strsource(rc), gpgme_strerror(rc));

365

286

gpgme_data_release(dh_crypto);

366

287

return -1;

370

291

data buffer */

371

292

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

372

293

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

294

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

375

295

gpgme_strsource(rc), gpgme_strerror(rc));

376

296

plaintext_length = -1;

377

297

if(debug){

378

298

gpgme_decrypt_result_t result;

379

299

result = gpgme_op_decrypt_result(mc.ctx);

380

300

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

301

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

383

302

} else {

384

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

385

"Unsupported algorithm: %s\n",

303

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

386

304

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

305

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

389

306

result->wrong_key_usage);

390

307

if(result->file_name != NULL){

391

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

392

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

308

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

393

309

}

394

310

gpgme_recipient_t recipient;

395

311

recipient = result->recipients;

396

312

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

313

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

399

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

315

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

316

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

404

317

recipient->status == GPG_ERR_NO_SECKEY

405

318

? "No" : "Yes");

406

319

recipient = recipient->next;

411

324

}

412

325

413

326

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

327

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

416

328

}

417

329

418

330

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

419

331

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

420

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

421

333

plaintext_length = -1;

422

334

goto decrypt_end;

423

335

}

425

337

*plaintext = NULL;

426

338

while(true){

427

339

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

430

342

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

434

346

}

435

347

436

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

441

353

break;

442

354

}

443

355

if(ret < 0){

444

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

445

357

plaintext_length = -1;

446

358

goto decrypt_end;

447

359

}

449

361

}

450

362

451

363

if(debug){

452

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

453

"Decrypted password is: ");

364

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

454

365

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

455

366

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

456

367

}

478

389

/* GnuTLS log function callback */

479

390

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

480

391

const char* string){

481

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

392

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

482

393

}

483

394

484

395

static int init_gnutls_global(const char *pubkeyfilename,

486

397

int ret;

487

398

488

399

if(debug){

489

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

490

"Initializing GnuTLS\n");

400

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

491

401

}

492

402

493

403

ret = gnutls_global_init();

494

404

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

405

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

406

safer_gnutls_strerror(ret));

497

407

return -1;

498

408

}

499

409

506

416

}

507

417

508

418

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

510

420

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

513

426

gnutls_global_deinit();

514

427

return -1;

515

428

}

516

429

517

430

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

431

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

520

432

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

521

433

seckeyfilename);

522

434

}

526

438

GNUTLS_OPENPGP_FMT_BASE64);

527

439

if(ret != GNUTLS_E_SUCCESS){

528

440

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

441

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

531

442

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

532

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

533

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

443

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

444

safer_gnutls_strerror(ret));

534

445

goto globalfail;

535

446

}

536

447

537

448

/* GnuTLS server initialization */

538

449

ret = gnutls_dh_params_init(&mc.dh_params);

539

450

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

451

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

542

452

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

543

453

goto globalfail;

544

454

}

545

455

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

546

456

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

457

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

549

458

safer_gnutls_strerror(ret));

550

459

goto globalfail;

551

460

}

567

476

/* GnuTLS session creation */

568

477

do {

569

478

ret = gnutls_init(session, GNUTLS_SERVER);

570

if(quit_now){

571

return -1;

572

}

573

479

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

574

480

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

481

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

577

482

safer_gnutls_strerror(ret));

578

483

}

579

484

581

486

const char *err;

582

487

do {

583

488

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

584

if(quit_now){

585

gnutls_deinit(*session);

586

return -1;

587

}

588

489

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

589

490

if(ret != GNUTLS_E_SUCCESS){

590

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

591

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

592

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

593

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

491

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

492

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

493

safer_gnutls_strerror(ret));

594

494

gnutls_deinit(*session);

595

495

return -1;

596

496

}

599

499

do {

600

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

601

501

mc.cred);

602

if(quit_now){

603

gnutls_deinit(*session);

604

return -1;

605

}

606

502

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

607

503

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

504

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

610

505

safer_gnutls_strerror(ret));

611

506

gnutls_deinit(*session);

612

507

return -1;

624

519

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

625

520

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

626

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

627

525

/* Called when a Mandos server is found */

628

526

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

629

527

AvahiIfIndex if_index,

635

533

struct sockaddr_in6 in6;

636

534

} to;

637

535

char *buffer = NULL;

638

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

639

537

size_t buffer_length = 0;

640

538

size_t buffer_capacity = 0;

641

539

size_t written;

642

int retval = -1;

540

int retval = 0;

643

541

gnutls_session_t session;

644

542

int pf; /* Protocol family */

645

543

646

errno = 0;

647

648

544

if(quit_now){

649

errno = EINTR;

650

545

return -1;

651

546

}

652

547

658

553

pf = PF_INET;

659

554

break;

660

555

default:

661

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

662

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

663

errno = EINVAL;

556

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

664

557

return -1;

665

558

}

666

559

670

563

}

671

564

672

565

if(debug){

673

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

674

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

566

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

675

567

"\n", ip, port);

676

568

}

677

569

678

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

679

571

if(tcp_sd < 0){

680

int e = errno;

681

perror_plus("socket");

682

errno = e;

572

perror("socket");

573

retval = -1;

683

574

goto mandos_end;

684

575

}

685

576

686

577

if(quit_now){

687

errno = EINTR;

688

578

goto mandos_end;

689

579

}

690

580

697

587

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

698

588

}

699

589

if(ret < 0 ){

700

int e = errno;

701

perror_plus("inet_pton");

702

errno = e;

590

perror("inet_pton");

591

retval = -1;

703

592

goto mandos_end;

704

593

}

705

594

if(ret == 0){

706

int e = errno;

707

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

708

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

709

errno = e;

595

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

596

retval = -1;

710

597

goto mandos_end;

711

598

}

712

599

if(af == AF_INET6){

716

603

717

604

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

605

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

719

-Wunreachable-code*/

606

-Wunreachable-code*/

720

607

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

608

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

723

609

" without a network interface\n");

724

errno = EINVAL;

610

retval = -1;

725

611

goto mandos_end;

726

612

}

727

613

/* Set the network interface number as scope */

734

620

}

735

621

736

622

if(quit_now){

737

errno = EINTR;

738

623

goto mandos_end;

739

624

}

740

625

742

627

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

743

628

char interface[IF_NAMESIZE];

744

629

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

745

perror_plus("if_indextoname");

630

perror("if_indextoname");

746

631

} else {

747

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

748

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

632

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

749

633

ip, interface, port);

750

634

}

751

635

} else {

752

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

753

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

636

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

637

port);

754

638

}

755

639

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

640

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

763

647

sizeof(addrstr));

764

648

}

765

649

if(pcret == NULL){

766

perror_plus("inet_ntop");

650

perror("inet_ntop");

767

651

} else {

768

652

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

769

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

770

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

653

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

771

654

}

772

655

}

773

656

}

774

657

775

658

if(quit_now){

776

errno = EINTR;

777

659

goto mandos_end;

778

660

}

779

661

783

665

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

784

666

}

785

667

if(ret < 0){

786

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

787

int e = errno;

788

perror_plus("connect");

789

errno = e;

790

}

668

perror("connect");

669

retval = -1;

791

670

goto mandos_end;

792

671

}

793

672

794

673

if(quit_now){

795

errno = EINTR;

796

674

goto mandos_end;

797

675

}

798

676

801

679

while(true){

802

680

size_t out_size = strlen(out);

803

681

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

804

out_size - written));

682

out_size - written));

805

683

if(ret == -1){

806

int e = errno;

807

perror_plus("write");

808

errno = e;

684

perror("write");

685

retval = -1;

809

686

goto mandos_end;

810

687

}

811

688

written += (size_t)ret;

821

698

}

822

699

823

700

if(quit_now){

824

errno = EINTR;

825

701

goto mandos_end;

826

702

}

827

703

}

828

704

829

705

if(debug){

830

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

831

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

706

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

832

707

}

833

708

834

709

if(quit_now){

835

errno = EINTR;

836

710

goto mandos_end;

837

711

}

838

712

839

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

840

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

841

714

842

715

if(quit_now){

843

errno = EINTR;

844

716

goto mandos_end;

845

717

}

846

718

847

719

do {

848

720

ret = gnutls_handshake(session);

849

721

if(quit_now){

850

errno = EINTR;

851

722

goto mandos_end;

852

723

}

853

724

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

854

725

855

726

if(ret != GNUTLS_E_SUCCESS){

856

727

if(debug){

857

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

858

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

728

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

859

729

gnutls_perror(ret);

860

730

}

861

errno = EPROTO;

731

retval = -1;

862

732

goto mandos_end;

863

733

}

864

734

865

735

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

866

736

867

737

if(debug){

868

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

869

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

738

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

739

ip);

870

740

}

871

741

872

742

while(true){

873

743

874

744

if(quit_now){

875

errno = EINTR;

876

745

goto mandos_end;

877

746

}

878

747

879

748

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

749

buffer_capacity);

881

750

if(buffer_capacity == 0){

882

int e = errno;

883

perror_plus("incbuffer");

884

errno = e;

751

perror("incbuffer");

752

retval = -1;

885

753

goto mandos_end;

886

754

}

887

755

888

756

if(quit_now){

889

errno = EINTR;

890

757

goto mandos_end;

891

758

}

892

759

905

772

ret = gnutls_handshake(session);

906

773

907

774

if(quit_now){

908

errno = EINTR;

909

775

goto mandos_end;

910

776

}

911

777

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

912

778

if(ret < 0){

913

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

914

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

779

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

915

780

gnutls_perror(ret);

916

errno = EPROTO;

781

retval = -1;

917

782

goto mandos_end;

918

783

}

919

784

break;

920

785

default:

921

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

922

"Unknown error while reading data from"

786

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

923

787

" encrypted session with Mandos server\n");

788

retval = -1;

924

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

errno = EIO;

926

790

goto mandos_end;

927

791

}

928

792

} else {

931

795

}

932

796

933

797

if(debug){

934

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

935

"Closing TLS session\n");

936

}

937

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

943

do {

944

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

945

if(quit_now){

946

errno = EINTR;

947

goto mandos_end;

948

}

949

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

798

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

799

}

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

950

810

951

811

if(buffer_length > 0){

952

812

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

buffer_length,

954

815

&decrypted_buffer);

955

816

if(decrypted_buffer_size >= 0){

956

817

957

818

written = 0;

958

819

while(written < (size_t) decrypted_buffer_size){

959

820

if(quit_now){

960

errno = EINTR;

961

821

goto mandos_end;

962

822

}

963

823

965

825

(size_t)decrypted_buffer_size - written,

966

826

stdout);

967

827

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

968

int e = errno;

969

828

if(debug){

970

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

971

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

829

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

972

830

strerror(errno));

973

831

}

974

errno = e;

975

goto mandos_end;

832

retval = -1;

833

break;

976

834

}

977

835

written += (size_t)ret;

978

836

}

979

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

980

840

}

841

} else {

842

retval = -1;

981

843

}

982

844

983

845

/* Shutdown procedure */

984

846

985

847

mandos_end:

986

{

987

int e = errno;

988

free(decrypted_buffer);

989

free(buffer);

990

if(tcp_sd >= 0){

991

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

992

}

993

if(ret == -1){

994

if(e == 0){

995

e = errno;

996

}

997

perror_plus("close");

998

}

999

gnutls_deinit(session);

1000

errno = e;

1001

if(quit_now){

1002

errno = EINTR;

1003

retval = -1;

1004

}

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

1005

858

}

1006

859

return retval;

1007

860

}

1032

885

switch(event){

1033

886

default:

1034

887

case AVAHI_RESOLVER_FAILURE:

1035

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

1036

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

888

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

1037

889

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

1038

890

avahi_strerror(avahi_server_errno(mc.server)));

1039

891

break;

1043

895

char ip[AVAHI_ADDRESS_STR_MAX];

1044

896

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

1045

897

if(debug){

1046

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

1047

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

898

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

1048

899

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

1049

900

ip, (intmax_t)interface, port);

1050

901

}

1052

903

avahi_proto_to_af(proto));

1053

904

if(ret == 0){

1054

905

avahi_simple_poll_quit(mc.simple_poll);

1055

} else {

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1058

906

}

1059

907

}

1060

908

}

1084

932

default:

1085

933

case AVAHI_BROWSER_FAILURE:

1086

934

1087

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

1088

"(Avahi browser) %s\n",

935

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

1089

936

avahi_strerror(avahi_server_errno(mc.server)));

1090

937

avahi_simple_poll_quit(mc.simple_poll);

1091

938

return;

1099

946

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

1100

947

name, type, domain, protocol, 0,

1101

948

resolve_callback, NULL) == NULL)

1102

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

1103

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

949

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

1104

950

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

1105

951

break;

1106

952

1110

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

958

if(debug){

1113

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

1114

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

959

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

1115

960

}

1116

961

break;

1117

962

}

1118

963

}

1119

964

1120

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

965

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

1121

966

static void handle_sigterm(int sig){

1122

967

if(quit_now){

1123

968

return;

1125

970

quit_now = 1;

1126

971

signal_received = sig;

1127

972

int old_errno = errno;

1128

/* set main loop to exit */

1129

973

if(mc.simple_poll != NULL){

1130

974

avahi_simple_poll_quit(mc.simple_poll);

1131

975

}

1132

976

errno = old_errno;

1133

977

}

1134

978

1135

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

1136

int ret;

1137

1138

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

1139

if(s < 0){

1140

perror_plus("socket");

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1146

if(debug){

1147

perror_plus("ioctl SIOCGIFFLAGS");

1148

}

1149

return false;

1150

}

1151

return true;

1152

}

1153

1154

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

1155

1156

/* Reject the loopback device */

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1158

if(debug){

1159

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

1160

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

1161

}

1162

return false;

1163

}

1164

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

1165

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

1166

if(debug){

1167

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

1168

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

1169

}

1170

return true;

1171

}

1172

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

1173

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

1174

if(debug){

1175

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

1176

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

1177

}

1178

return false;

1179

}

1180

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

1181

if(ifr->ifr_flags & IFF_NOARP){

1182

if(debug){

1183

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

1184

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

1185

}

1186

return false;

1187

}

1188

1189

/* Accept this device */

1190

if(debug){

1191

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

1192

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

1193

}

1194

return true;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device.

1200

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

1201

*/

1202

int good_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(stderr, "Mandos plugin mandos-client: "

1211

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

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

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

1245

if(debug){

1246

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

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

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

1255

if(debug){

1256

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

1257

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

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1265

}

1266

return 1;

1267

}

1268

1269

int notdotentries(const struct dirent *direntry){

1270

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

1271

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

1272

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

1273

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

1274

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

1275

return 0;

1276

}

1277

return 1;

1278

}

1279

1280

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

1281

int runnable_hook(const struct dirent *direntry){

1282

int ret;

1283

size_t sret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

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

1292

"abcdefghijklmnopqrstuvwxyz"

1293

"0123456789"

1294

"_-");

1295

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

1296

/* Contains non-allowed characters */

1297

if(debug){

1298

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

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1313

if(ret == -1){

1314

if(debug){

1315

perror_plus("Could not stat hook");

1316

}

1317

return 0;

1318

}

1319

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

1320

/* Not a regular file */

1321

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1325

}

1326

return 0;

1327

}

1328

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

1329

/* Not executable */

1330

if(debug){

1331

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

1332

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

1333

direntry->d_name);

1334

}

1335

return 0;

1336

}

1337

return 1;

1338

}

1339

1340

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1341

int ret;

1342

struct timespec now;

1343

struct timespec waited_time;

1344

intmax_t block_time;

1345

1346

while(true){

1347

if(mc.current_server == NULL){

1348

if (debug){

1349

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

1350

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

1351

}

1352

ret = avahi_simple_poll_iterate(s, -1);

1353

} else {

1354

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1358

}

1359

/* the current time */

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1361

if(ret == -1){

1362

perror_plus("clock_gettime");

1363

return -1;

1364

}

1365

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

1366

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

1367

waited_time.tv_sec = (now.tv_sec

1368

- mc.current_server->last_seen.tv_sec);

1369

waited_time.tv_nsec = (now.tv_nsec

1370

- mc.current_server->last_seen.tv_nsec);

1371

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

1372

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

1373

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

1374

block_time = ((retry_interval

1375

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

1376

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

1377

1378

if (debug){

1379

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

1380

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

1381

}

1382

1383

if(block_time <= 0){

1384

ret = start_mandos_communication(mc.current_server->ip,

1385

mc.current_server->port,

1386

mc.current_server->if_index,

1387

mc.current_server->af);

1388

if(ret == 0){

1389

avahi_simple_poll_quit(mc.simple_poll);

1390

return 0;

1391

}

1392

ret = clock_gettime(CLOCK_MONOTONIC,

1393

&mc.current_server->last_seen);

1394

if(ret == -1){

1395

perror_plus("clock_gettime");

1396

return -1;

1397

}

1398

mc.current_server = mc.current_server->next;

1399

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

1400

servers, but don't block */

1401

}

1402

1403

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

1404

}

1405

if(ret != 0){

1406

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

1407

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

1408

}

1409

}

1410

}

1411

}

1412

1413

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

1414

const float delay){

1415

struct dirent **direntries;

1416

struct dirent *direntry;

1417

int ret;

1418

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

1419

alphasort);

1420

if(numhooks == -1){

1421

perror_plus("scandir");

1422

} else {

1423

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

1424

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

1425

direntry = direntries[0];

1426

char *fullname = NULL;

1427

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

1428

if(ret < 0){

1429

perror_plus("asprintf");

1430

continue;

1431

}

1432

pid_t hook_pid = fork();

1433

if(hook_pid == 0){

1434

/* Child */

1435

dup2(devnull, STDIN_FILENO);

1436

close(devnull);

1437

dup2(STDERR_FILENO, STDOUT_FILENO);

1438

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

1439

if(ret == -1){

1440

perror_plus("setenv");

1441

return false;

1442

}

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

return false;

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

return false;

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

return false;

1457

}

1458

char *delaystring;

1459

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

1460

if(ret == -1){

1461

perror_plus("asprintf");

1462

return false;

1463

}

1464

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

1465

if(ret == -1){

1466

free(delaystring);

1467

perror_plus("setenv");

1468

return false;

1469

}

1470

free(delaystring);

1471

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

1472

perror_plus("execl");

1473

} else {

1474

int status;

1475

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

1476

perror_plus("waitpid");

1477

free(fullname);

1478

continue;

1479

}

1480

if(WIFEXITED(status)){

1481

if(WEXITSTATUS(status) != 0){

1482

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

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

direntry->d_name);

1500

free(fullname);

1501

continue;

1502

}

1503

}

1504

free(fullname);

1505

if(quit_now){

1506

break;

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1512

}

1513

1514

979

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

1515

980

AvahiSServiceBrowser *sb = NULL;

1516

981

int error;

1518

983

intmax_t tmpmax;

1519

984

char *tmp;

1520

985

int exitcode = EXIT_SUCCESS;

1521

const char *interface = "";

986

const char *interface = "eth0";

1522

987

struct ifreq network;

1523

988

int sd = -1;

1524

989

bool take_down_interface = false;

1525

990

uid_t uid;

1526

991

gid_t gid;

992

char *connect_to = NULL;

1527

993

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

1528

994

bool tempdir_created = false;

1529

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1533

999

bool gnutls_initialized = false;

1534

1000

bool gpgme_initialized = false;

1535

1001

float delay = 2.5f;

1536

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

1537

retrying the same server again */

1538

1002

1539

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1540

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1546

1010

errno = 0;

1547

1011

ret = setgid(gid);

1548

1012

if(ret == -1){

1549

perror_plus("setgid");

1013

perror("setgid");

1550

1014

}

1551

1015

1552

1016

/* Lower user privileges (temporarily) */

1553

1017

errno = 0;

1554

1018

ret = seteuid(uid);

1555

1019

if(ret == -1){

1556

perror_plus("seteuid");

1020

perror("seteuid");

1557

1021

}

1558

1022

1559

1023

if(quit_now){

1594

1058

.arg = "SECONDS",

1595

1059

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

1596

1060

.group = 2 },

1597

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

1598

.arg = "SECONDS",

1599

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

1600

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

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

1604

.group = 2 },

1605

/*

1606

* These reproduce what we would get without ARGP_NO_HELP

1607

*/

1608

{ .name = "help", .key = '?',

1609

.doc = "Give this help list", .group = -1 },

1610

{ .name = "usage", .key = -3,

1611

.doc = "Give a short usage message", .group = -1 },

1612

{ .name = "version", .key = 'V',

1613

.doc = "Print program version", .group = -1 },

1614

1061

{ .name = NULL }

1615

1062

};

1616

1063

1617

1064

error_t parse_opt(int key, char *arg,

1618

1065

struct argp_state *state){

1619

errno = 0;

1620

1066

switch(key){

1621

1067

case 128: /* --debug */

1622

1068

debug = true;

1638

1084

tmpmax = strtoimax(arg, &tmp, 10);

1639

1085

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

1640

1086

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1641

argp_error(state, "Bad number of DH bits");

1087

fprintf(stderr, "Bad number of DH bits\n");

1088

exit(EXIT_FAILURE);

1642

1089

}

1643

1090

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1644

1091

break;

1649

1096

errno = 0;

1650

1097

delay = strtof(arg, &tmp);

1651

1098

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

1652

argp_error(state, "Bad delay");

1653

}

1654

case 132: /* --retry */

1655

errno = 0;

1656

retry_interval = strtod(arg, &tmp);

1657

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

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1660

argp_error(state, "Bad retry interval");

1661

}

1662

break;

1663

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

1664

hookdir = arg;

1665

break;

1666

/*

1667

* These reproduce what we would get without ARGP_NO_HELP

1668

*/

1669

case '?': /* --help */

1670

argp_state_help(state, state->out_stream,

1671

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1672

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1673

case -3: /* --usage */

1674

argp_state_help(state, state->out_stream,

1675

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1676

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

1677

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

1678

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

1679

exit(argp_err_exit_status);

1099

fprintf(stderr, "Bad delay\n");

1100

exit(EXIT_FAILURE);

1101

}

1102

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1680

1106

break;

1681

1107

default:

1682

1108

return ARGP_ERR_UNKNOWN;

1683

1109

}

1684

return errno;

1110

return 0;

1685

1111

}

1686

1112

1687

1113

struct argp argp = { .options = options, .parser = parse_opt,

1688

1114

.args_doc = "",

1689

1115

.doc = "Mandos client -- Get and decrypt"

1690

1116

" passwords from a Mandos server" };

1691

ret = argp_parse(&argp, argc, argv,

1692

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1693

switch(ret){

1694

case 0:

1695

break;

1696

case ENOMEM:

1697

default:

1698

errno = ret;

1699

perror_plus("argp_parse");

1700

exitcode = EX_OSERR;

1701

goto end;

1702

case EINVAL:

1703

exitcode = EX_USAGE;

1704

goto end;

1705

}

1706

}

1707

1708

{

1709

/* Work around Debian bug #633582:

1710

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

1711

struct stat st;

1712

1713

/* Re-raise priviliges */

1714

errno = 0;

1715

ret = seteuid(0);

1716

if(ret == -1){

1717

perror_plus("seteuid");

1718

}

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode) 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

/* Run network hooks */

1769

{

1770

/* Re-raise priviliges */

1771

errno = 0;

1772

ret = seteuid(0);

1773

if(ret == -1){

1774

perror_plus("seteuid");

1775

}

1776

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

1777

goto end;

1778

}

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1117

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

fprintf(stderr, "Unknown error while parsing arguments\n");

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1784

1122

}

1785

1123

}

1786

1124

1788

1126

avahi_set_log_function(empty_log);

1789

1127

}

1790

1128

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

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

1808

}

1809

if(interface == NULL){

1810

perror_plus("malloc");

1811

free(direntries);

1812

exitcode = EXIT_FAILURE;

1813

goto end;

1814

}

1815

free(direntries);

1816

} else {

1817

free(direntries);

1818

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

1819

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

1820

exitcode = EXIT_FAILURE;

1821

goto end;

1822

}

1823

}

1824

1825

1129

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

1826

1130

from the signal handler */

1827

1131

/* Initialize the pseudo-RNG for Avahi */

1828

1132

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

1829

1133

mc.simple_poll = avahi_simple_poll_new();

1830

1134

if(mc.simple_poll == NULL){

1831

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

1832

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

1833

exitcode = EX_UNAVAILABLE;

1135

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

1136

exitcode = EXIT_FAILURE;

1834

1137

goto end;

1835

1138

}

1836

1139

1837

1140

sigemptyset(&sigterm_action.sa_mask);

1838

1141

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

1839

1142

if(ret == -1){

1840

perror_plus("sigaddset");

1841

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1842

1145

goto end;

1843

1146

}

1844

1147

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

1845

1148

if(ret == -1){

1846

perror_plus("sigaddset");

1847

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1848

1151

goto end;

1849

1152

}

1850

1153

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

1851

1154

if(ret == -1){

1852

perror_plus("sigaddset");

1853

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1854

1157

goto end;

1855

1158

}

1856

1159

/* Need to check if the handler is SIG_IGN before handling:

1859

1162

*/

1860

1163

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

1861

1164

if(ret == -1){

1862

perror_plus("sigaction");

1863

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1864

1167

}

1865

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1866

1169

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

1867

1170

if(ret == -1){

1868

perror_plus("sigaction");

1869

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1870

1173

goto end;

1871

1174

}

1872

1175

}

1873

1176

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

1874

1177

if(ret == -1){

1875

perror_plus("sigaction");

1876

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1877

1180

}

1878

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1879

1182

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

1880

1183

if(ret == -1){

1881

perror_plus("sigaction");

1882

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1883

1186

goto end;

1884

1187

}

1885

1188

}

1886

1189

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

1887

1190

if(ret == -1){

1888

perror_plus("sigaction");

1889

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1890

1193

}

1891

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1892

1195

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

1893

1196

if(ret == -1){

1894

perror_plus("sigaction");

1895

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1896

1199

goto end;

1897

1200

}

1898

1201

}

1899

1202

1900

1203

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

1901

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

1204

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

1902

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1903

1206

if(if_index == 0){

1904

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

1905

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

1906

exitcode = EX_UNAVAILABLE;

1207

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

1208

exitcode = EXIT_FAILURE;

1907

1209

goto end;

1908

1210

}

1909

1211

1915

1217

errno = 0;

1916

1218

ret = seteuid(0);

1917

1219

if(ret == -1){

1918

perror_plus("seteuid");

1220

perror("seteuid");

1919

1221

}

1920

1222

1921

1223

#ifdef __linux__

1922

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1225

messages to mess up the prompt */

1924

1226

ret = klogctl(8, NULL, 5);

1925

1227

bool restore_loglevel = true;

1926

1228

if(ret == -1){

1927

1229

restore_loglevel = false;

1928

perror_plus("klogctl");

1230

perror("klogctl");

1929

1231

}

1930

1232

#endif /* __linux__ */

1931

1233

1932

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

1235

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1936

1238

#ifdef __linux__

1937

1239

if(restore_loglevel){

1938

1240

ret = klogctl(7, NULL, 0);

1939

1241

if(ret == -1){

1940

perror_plus("klogctl");

1242

perror("klogctl");

1941

1243

}

1942

1244

}

1943

1245

#endif /* __linux__ */

1945

1247

errno = 0;

1946

1248

ret = seteuid(uid);

1947

1249

if(ret == -1){

1948

perror_plus("seteuid");

1250

perror("seteuid");

1949

1251

}

1950

1252

goto end;

1951

1253

}

1952

1254

strcpy(network.ifr_name, interface);

1953

1255

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

1954

1256

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1956

1258

#ifdef __linux__

1957

1259

if(restore_loglevel){

1958

1260

ret = klogctl(7, NULL, 0);

1959

1261

if(ret == -1){

1960

perror_plus("klogctl");

1262

perror("klogctl");

1961

1263

}

1962

1264

}

1963

1265

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1965

1267

/* Lower privileges */

1966

1268

errno = 0;

1967

1269

ret = seteuid(uid);

1968

1270

if(ret == -1){

1969

perror_plus("seteuid");

1271

perror("seteuid");

1970

1272

}

1971

1273

goto end;

1972

1274

}

1976

1278

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

1977

1279

if(ret == -1){

1978

1280

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1981

1283

#ifdef __linux__

1982

1284

if(restore_loglevel){

1983

1285

ret = klogctl(7, NULL, 0);

1984

1286

if(ret == -1){

1985

perror_plus("klogctl");

1287

perror("klogctl");

1986

1288

}

1987

1289

}

1988

1290

#endif /* __linux__ */

1990

1292

errno = 0;

1991

1293

ret = seteuid(uid);

1992

1294

if(ret == -1){

1993

perror_plus("seteuid");

1295

perror("seteuid");

1994

1296

}

1995

1297

goto end;

1996

1298

}

1997

1299

}

1998

/* Sleep checking until interface is running.

1999

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

1300

/* sleep checking until interface is running */

2000

1301

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

2001

1302

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

2002

1303

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

2004

1305

} else if(network.ifr_flags & IFF_RUNNING){

2005

1306

break;

2006

1307

}

2007

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

1309

ret = nanosleep(&sleeptime, NULL);

2009

1310

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

2010

perror_plus("nanosleep");

1311

perror("nanosleep");

2011

1312

}

2012

1313

}

2013

1314

if(not take_down_interface){

2014

1315

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

2015

1316

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

2016

1317

if(ret == -1){

2017

perror_plus("close");

1318

perror("close");

2018

1319

}

2019

1320

}

2020

1321

#ifdef __linux__

2022

1323

/* Restores kernel loglevel to default */

2023

1324

ret = klogctl(7, NULL, 0);

2024

1325

if(ret == -1){

2025

perror_plus("klogctl");

1326

perror("klogctl");

2026

1327

}

2027

1328

}

2028

1329

#endif /* __linux__ */

2029

1330

/* Lower privileges */

2030

1331

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

2035

1344

}

2036

1345

}

2037

1346

2041

1350

2042

1351

ret = init_gnutls_global(pubkey, seckey);

2043

1352

if(ret == -1){

2044

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

2045

"init_gnutls_global failed\n");

2046

exitcode = EX_UNAVAILABLE;

1353

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

1354

exitcode = EXIT_FAILURE;

2047

1355

goto end;

2048

1356

} else {

2049

1357

gnutls_initialized = true;

2053

1361

goto end;

2054

1362

}

2055

1363

1364

tempdir_created = true;

2056

1365

if(mkdtemp(tempdir) == NULL){

2057

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

2058

1368

goto end;

2059

1369

}

2060

tempdir_created = true;

2061

1370

2062

1371

if(quit_now){

2063

1372

goto end;

2064

1373

}

2065

1374

2066

1375

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

2067

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

2068

"init_gpgme failed\n");

2069

exitcode = EX_UNAVAILABLE;

1376

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

1377

exitcode = EXIT_FAILURE;

2070

1378

goto end;

2071

1379

} else {

2072

1380

gpgme_initialized = true;

2081

1389

/* (Mainly meant for debugging) */

2082

1390

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

2083

1391

if(address == NULL){

2084

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

2085

"No colon in address\n");

2086

exitcode = EX_USAGE;

1392

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

1393

exitcode = EXIT_FAILURE;

2087

1394

goto end;

2088

1395

}

2089

1396

2096

1403

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

2097

1404

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

2098

1405

or tmpmax != (uint16_t)tmpmax){

2099

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

2100

"Bad port number\n");

2101

exitcode = EX_USAGE;

1406

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

1407

exitcode = EXIT_FAILURE;

2102

1408

goto end;

2103

1409

}

2104

1410

2108

1414

2109

1415

port = (uint16_t)tmpmax;

2110

1416

*address = '\0';

1417

address = connect_to;

2111

1418

/* Colon in address indicates IPv6 */

2112

1419

int af;

2113

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

1420

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

2114

1421

af = AF_INET6;

2115

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

2116

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

2117

{

2118

connect_to++;

2119

address[-1] = '\0';

2120

}

2121

1422

} else {

2122

1423

af = AF_INET;

2123

1424

}

2124

address = connect_to;

2125

1425

2126

1426

if(quit_now){

2127

1427

goto end;

2128

1428

}

2129

1429

2130

while(not quit_now){

2131

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

2132

if(quit_now or ret == 0){

2133

break;

2134

}

2135

if(debug){

2136

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

2137

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

2138

}

2139

sleep((int)retry_interval);

2140

}

2141

2142

if (not quit_now){

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2143

1434

exitcode = EXIT_SUCCESS;

2144

1435

}

2145

2146

1436

goto end;

2147

1437

}

2148

1438

2170

1460

2171

1461

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

2172

1462

if(mc.server == NULL){

2173

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

2174

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

1463

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

2175

1464

avahi_strerror(error));

2176

exitcode = EX_UNAVAILABLE;

1465

exitcode = EXIT_FAILURE;

2177

1466

goto end;

2178

1467

}

2179

1468

2186

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2187

1476

NULL, 0, browse_callback, NULL);

2188

1477

if(sb == NULL){

2189

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

2190

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

1478

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

2191

1479

avahi_strerror(avahi_server_errno(mc.server)));

2192

exitcode = EX_UNAVAILABLE;

1480

exitcode = EXIT_FAILURE;

2193

1481

goto end;

2194

1482

}

2195

1483

2200

1488

/* Run the main loop */

2201

1489

2202

1490

if(debug){

2203

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

2204

"Starting Avahi loop search\n");

2205

}

2206

2207

ret = avahi_loop_with_timeout(mc.simple_poll,

2208

(int)(retry_interval * 1000));

2209

if(debug){

2210

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

2211

"avahi_loop_with_timeout exited %s\n",

2212

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

2213

}

1491

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

1492

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2214

1495

2215

1496

end:

2216

1497

2217

1498

if(debug){

2218

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

2219

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

1499

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

2220

1500

}

2221

1501

2222

1502

/* Cleanup things */

2238

1518

if(gpgme_initialized){

2239

1519

gpgme_release(mc.ctx);

2240

1520

}

2241

2242

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

2243

has seen */

2244

if(mc.current_server != NULL){

2245

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

2246

while(mc.current_server != NULL){

2247

server *next = mc.current_server->next;

2248

free(mc.current_server);

2249

mc.current_server = next;

2250

}

2251

}

2252

1521

2253

/* Re-raise priviliges */

2254

{

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

2255

1525

errno = 0;

2256

1526

ret = seteuid(0);

2257

1527

if(ret == -1){

2258

perror_plus("seteuid");

2259

}

2260

/* Run network hooks */

2261

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

2262

goto end;

2263

}

2264

2265

/* Take down the network interface */

2266

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

1528

perror("seteuid");

1529

}

1530

if(geteuid() == 0){

2267

1531

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

2268

1532

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

2272

1536

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

2273

1537

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

2275

1539

}

2276

1540

}

2277

1541

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

2278

1542

if(ret == -1){

2279

perror_plus("close");

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

2280

1550

}

2281

1551

}

2282

1552

}

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2289

1553

2290

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

1554

/* Removes the temp directory used by GPGME */

2291

1555

if(tempdir_created){

2292

struct dirent **direntries = NULL;

2293

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

2297

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

2298

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

2299

1576

char *fullname = NULL;

2300

1577

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

2301

1578

direntry->d_name);

2302

1579

if(ret < 0){

2303

perror_plus("asprintf");

1580

perror("asprintf");

2304

1581

continue;

2305

1582

}

2306

1583

ret = remove(fullname);

2307

1584

if(ret == -1){

2308

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

2309

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

1585

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

1586

strerror(errno));

2310

1587

}

2311

1588

free(fullname);

2312

1589

}

2313

}

2314

2315

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

2316

free(direntries);

2317

if (numentries == -1){

2318

perror_plus("scandir");

1590

closedir(d);

2319

1591

}

2320

1592

ret = rmdir(tempdir);

2321

1593

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

2322

perror_plus("rmdir");

1594

perror("rmdir");

2323

1595

}

2324

1596

}

2325

1597

2326

1598

if(quit_now){

2327

1599

sigemptyset(&old_sigterm_action.sa_mask);

2328

1600

old_sigterm_action.sa_handler = SIG_DFL;

2329

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2330

&old_sigterm_action,

2331

NULL));

1601

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

2332

1602

if(ret == -1){

2333

perror_plus("sigaction");

2334

}

2335

do {

2336

ret = raise(signal_received);

2337

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

2338

if(ret != 0){

2339

perror_plus("raise");

2340

abort();

2341

}

2342

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2343

1606

}

2344

1607

2345

1608

return exitcode;