/mandos/trunk : revision 505.1.27

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@fukt.bsnet.se>.

29

* Contact the authors at <mandos@recompile.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, EXIT_FAILURE,

47

srand(), strtof(), abort() */

46

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

47

strtof(), abort() */

48

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

49

#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() */

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

72

73

*/

73

74

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

74

75

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

75

setgid(), pause() */

76

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

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

82

83

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

83

84

sigaction(), SIGTERM, sig_atomic_t,

84

85

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

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

85

91

86

92

#ifdef __linux__

87

93

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

105

111

init_gnutls_session(),

106

112

GNUTLS_* */

107

113

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

110

116

111

117

/* GPGME */

112

118

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

120

126

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

121

127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

129

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

123

130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

127

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

134

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

128

135

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

129

136

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;

130

149

131

150

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

132

151

typedef struct {

137

156

gnutls_dh_params_t dh_params;

138

157

const char *priority;

139

158

gpgme_ctx_t ctx;

159

server *current_server;

140

160

} mandos_context;

141

161

142

162

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

143

163

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

144

164

.dh_bits = 1024, .priority = "SECURE256"

145

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

165

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

166

.current_server = NULL };

146

167

147

168

sig_atomic_t quit_now = 0;

148

169

int signal_received = 0;

149

170

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

150

187

/*

151

188

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

152

189

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

153

190

* "buffer_length" is how much is already used.

154

191

*/

155

192

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

193

size_t buffer_capacity){

157

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

195

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

159

196

if(buffer == NULL){

164

201

return buffer_capacity;

165

202

}

166

203

204

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

205

bool 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 false;

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 false;

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 false;

237

}

238

return true;

239

}

240

167

241

/*

168

242

* Initialize GPGME.

169

243

*/

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

172

246

gpgme_error_t rc;

173

247

gpgme_engine_info_t engine_info;

174

248

183

257

184

258

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

185

259

if(fd == -1){

186

perror("open");

260

perror_plus("open");

187

261

return false;

188

262

}

189

263

190

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

265

if(rc != GPG_ERR_NO_ERROR){

192

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

193

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

194

268

return false;

195

269

}

196

270

197

271

rc = gpgme_op_import(mc.ctx, pgp_data);

198

272

if(rc != GPG_ERR_NO_ERROR){

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

201

275

return false;

202

276

}

203

277

204

278

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

205

279

if(ret == -1){

206

perror("close");

280

perror_plus("close");

207

281

}

208

282

gpgme_data_release(pgp_data);

209

283

return true;

210

284

}

211

285

212

286

if(debug){

213

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

287

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

214

288

}

215

289

216

290

/* Init GPGME */

217

291

gpgme_check_version(NULL);

218

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

293

if(rc != GPG_ERR_NO_ERROR){

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

222

296

return false;

223

297

}

224

298

225

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

299

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

226

300

rc = gpgme_get_engine_info(&engine_info);

227

301

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

230

304

return false;

231

305

}

232

306

while(engine_info != NULL){

238

312

engine_info = engine_info->next;

239

313

}

240

314

if(engine_info == NULL){

241

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

315

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

316

tempdir);

242

317

return false;

243

318

}

244

319

245

320

/* Create new GPGME "context" */

246

321

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

247

322

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

250

326

return false;

251

327

}

252

328

271

347

ssize_t plaintext_length = 0;

272

348

273

349

if(debug){

274

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

350

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

275

351

}

276

352

277

353

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

278

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

355

0);

280

356

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

283

359

return -1;

284

360

}

285

361

286

362

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

287

363

rc = gpgme_data_new(&dh_plain);

288

364

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

291

368

gpgme_data_release(dh_crypto);

292

369

return -1;

293

370

}

296

373

data buffer */

297

374

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

298

375

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

301

378

plaintext_length = -1;

302

379

if(debug){

303

380

gpgme_decrypt_result_t result;

304

381

result = gpgme_op_decrypt_result(mc.ctx);

305

382

if(result == NULL){

306

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

383

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

307

384

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

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);

312

389

if(result->file_name != NULL){

313

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

390

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

314

391

}

315

392

gpgme_recipient_t recipient;

316

393

recipient = result->recipients;

317

394

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

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");

324

402

recipient = recipient->next;

325

403

}

326

404

}

329

407

}

330

408

331

409

if(debug){

332

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

410

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

333

411

}

334

412

335

413

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

336

414

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

337

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

338

416

plaintext_length = -1;

339

417

goto decrypt_end;

340

418

}

342

420

*plaintext = NULL;

343

421

while(true){

344

422

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

347

425

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

351

429

}

352

430

353

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

436

break;

359

437

}

360

438

if(ret < 0){

361

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

362

440

plaintext_length = -1;

363

441

goto decrypt_end;

364

442

}

366

444

}

367

445

368

446

if(debug){

369

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

447

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

370

448

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

371

449

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

372

450

}

394

472

/* GnuTLS log function callback */

395

473

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

396

474

const char* string){

397

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

475

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

398

476

}

399

477

400

478

static int init_gnutls_global(const char *pubkeyfilename,

402

480

int ret;

403

481

404

482

if(debug){

405

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

483

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

406

484

}

407

485

408

486

ret = gnutls_global_init();

409

487

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

412

490

return -1;

413

491

}

414

492

421

499

}

422

500

423

501

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

503

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

431

506

gnutls_global_deinit();

432

507

return -1;

433

508

}

434

509

435

510

if(debug){

436

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

437

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

438

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

439

515

}

440

516

441

517

ret = gnutls_certificate_set_openpgp_key_file

442

518

(mc.cred, pubkeyfilename, seckeyfilename,

443

519

GNUTLS_OPENPGP_FMT_BASE64);

444

520

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

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));

450

526

goto globalfail;

451

527

}

452

528

453

529

/* GnuTLS server initialization */

454

530

ret = gnutls_dh_params_init(&mc.dh_params);

455

531

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

458

535

goto globalfail;

459

536

}

460

537

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

461

538

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

464

541

goto globalfail;

465

542

}

466

543

486

563

}

487

564

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

488

565

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

491

569

}

492

570

493

571

{

500

578

}

501

579

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

502

580

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

506

584

gnutls_deinit(*session);

507

585

return -1;

508

586

}

517

595

}

518

596

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

519

597

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

522

600

gnutls_deinit(*session);

523

601

return -1;

524

602

}

554

632

gnutls_session_t session;

555

633

int pf; /* Protocol family */

556

634

635

errno = 0;

636

557

637

if(quit_now){

638

errno = EINTR;

558

639

return -1;

559

640

}

560

641

566

647

pf = PF_INET;

567

648

break;

568

649

default:

569

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

650

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

651

errno = EINVAL;

570

652

return -1;

571

653

}

572

654

576

658

}

577

659

578

660

if(debug){

579

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

580

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

581

663

}

582

664

583

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

666

if(tcp_sd < 0){

585

perror("socket");

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

586

670

goto mandos_end;

587

671

}

588

672

589

673

if(quit_now){

674

errno = EINTR;

590

675

goto mandos_end;

591

676

}

592

677

599

684

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

600

685

}

601

686

if(ret < 0 ){

602

perror("inet_pton");

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

603

690

goto mandos_end;

604

691

}

605

692

if(ret == 0){

606

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

693

int e = errno;

694

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

695

errno = e;

607

696

goto mandos_end;

608

697

}

609

698

if(af == AF_INET6){

613

702

614

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

615

704

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

616

-Wunreachable-code*/

705

-Wunreachable-code*/

617

706

if(if_index == AVAHI_IF_UNSPEC){

618

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

619

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

620

710

goto mandos_end;

621

711

}

622

712

/* Set the network interface number as scope */

629

719

}

630

720

631

721

if(quit_now){

722

errno = EINTR;

632

723

goto mandos_end;

633

724

}

634

725

636

727

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

637

728

char interface[IF_NAMESIZE];

638

729

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

639

perror("if_indextoname");

730

perror_plus("if_indextoname");

640

731

} else {

641

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

642

ip, interface, port);

732

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

733

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

643

734

}

644

735

} else {

645

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

646

port);

736

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

737

ip, port);

647

738

}

648

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

649

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

656

747

sizeof(addrstr));

657

748

}

658

749

if(pcret == NULL){

659

perror("inet_ntop");

750

perror_plus("inet_ntop");

660

751

} else {

661

752

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

662

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

753

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

663

754

}

664

755

}

665

756

}

666

757

667

758

if(quit_now){

759

errno = EINTR;

668

760

goto mandos_end;

669

761

}

670

762

674

766

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

675

767

}

676

768

if(ret < 0){

677

perror("connect");

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

678

774

goto mandos_end;

679

775

}

680

776

681

777

if(quit_now){

778

errno = EINTR;

682

779

goto mandos_end;

683

780

}

684

781

687

784

while(true){

688

785

size_t out_size = strlen(out);

689

786

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

690

out_size - written));

787

out_size - written));

691

788

if(ret == -1){

692

perror("write");

789

int e = errno;

790

perror_plus("write");

791

errno = e;

693

792

goto mandos_end;

694

793

}

695

794

written += (size_t)ret;

705

804

}

706

805

707

806

if(quit_now){

807

errno = EINTR;

708

808

goto mandos_end;

709

809

}

710

810

}

711

811

712

812

if(debug){

713

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

813

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

714

814

}

715

815

716

816

if(quit_now){

817

errno = EINTR;

717

818

goto mandos_end;

718

819

}

719

820

821

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

720

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

823

722

824

if(quit_now){

825

errno = EINTR;

723

826

goto mandos_end;

724

827

}

725

828

726

829

do {

727

830

ret = gnutls_handshake(session);

728

831

if(quit_now){

832

errno = EINTR;

729

833

goto mandos_end;

730

834

}

731

835

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

732

836

733

837

if(ret != GNUTLS_E_SUCCESS){

734

838

if(debug){

735

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

839

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

736

840

gnutls_perror(ret);

737

841

}

842

errno = EPROTO;

738

843

goto mandos_end;

739

844

}

740

845

741

846

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

742

847

743

848

if(debug){

744

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

745

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

746

851

}

747

852

748

853

while(true){

749

854

750

855

if(quit_now){

856

errno = EINTR;

751

857

goto mandos_end;

752

858

}

753

859

754

860

buffer_capacity = incbuffer(&buffer, buffer_length,

755

buffer_capacity);

861

buffer_capacity);

756

862

if(buffer_capacity == 0){

757

perror("incbuffer");

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

758

866

goto mandos_end;

759

867

}

760

868

761

869

if(quit_now){

870

errno = EINTR;

762

871

goto mandos_end;

763

872

}

764

873

777

886

ret = gnutls_handshake(session);

778

887

779

888

if(quit_now){

889

errno = EINTR;

780

890

goto mandos_end;

781

891

}

782

892

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

783

893

if(ret < 0){

784

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

894

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

895

"***\n");

785

896

gnutls_perror(ret);

897

errno = EPROTO;

786

898

goto mandos_end;

787

899

}

788

900

break;

789

901

default:

790

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

791

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

792

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

793

906

goto mandos_end;

794

907

}

795

908

} else {

798

911

}

799

912

800

913

if(debug){

801

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

914

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

802

915

}

803

916

804

917

if(quit_now){

918

errno = EINTR;

805

919

goto mandos_end;

806

920

}

807

921

808

922

do {

809

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

924

if(quit_now){

925

errno = EINTR;

811

926

goto mandos_end;

812

927

}

813

928

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

814

929

815

930

if(buffer_length > 0){

816

931

ssize_t decrypted_buffer_size;

817

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

819

933

&decrypted_buffer);

820

934

if(decrypted_buffer_size >= 0){

821

935

822

936

written = 0;

823

937

while(written < (size_t) decrypted_buffer_size){

824

938

if(quit_now){

939

errno = EINTR;

825

940

goto mandos_end;

826

941

}

827

942

829

944

(size_t)decrypted_buffer_size - written,

830

945

stdout);

831

946

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

947

int e = errno;

832

948

if(debug){

833

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

834

strerror(errno));

949

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

950

strerror(errno));

835

951

}

952

errno = e;

836

953

goto mandos_end;

837

954

}

838

955

written += (size_t)ret;

844

961

/* Shutdown procedure */

845

962

846

963

mandos_end:

847

free(decrypted_buffer);

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;

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

858

983

}

859

984

return retval;

860

985

}

885

1010

switch(event){

886

1011

default:

887

1012

case AVAHI_RESOLVER_FAILURE:

888

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

889

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

890

avahi_strerror(avahi_server_errno(mc.server)));

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)));

891

1017

break;

892

1018

893

1019

case AVAHI_RESOLVER_FOUND:

895

1021

char ip[AVAHI_ADDRESS_STR_MAX];

896

1022

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

897

1023

if(debug){

898

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

899

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

900

ip, (intmax_t)interface, port);

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);

901

1027

}

902

1028

int ret = start_mandos_communication(ip, port, interface,

903

1029

avahi_proto_to_af(proto));

904

1030

if(ret == 0){

905

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

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

1036

" list\n", name);

1037

}

906

1038

}

907

1039

}

908

1040

}

932

1064

default:

933

1065

case AVAHI_BROWSER_FAILURE:

934

1066

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1067

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

937

1069

avahi_simple_poll_quit(mc.simple_poll);

938

1070

return;

939

1071

946

1078

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

947

1079

name, type, domain, protocol, 0,

948

1080

resolve_callback, NULL) == NULL)

949

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

950

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

1081

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

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

951

1084

break;

952

1085

953

1086

case AVAHI_BROWSER_REMOVE:

956

1089

case AVAHI_BROWSER_ALL_FOR_NOW:

957

1090

case AVAHI_BROWSER_CACHE_EXHAUSTED:

958

1091

if(debug){

959

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

1092

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

1093

" searching...\n");

960

1094

}

961

1095

break;

962

1096

}

963

1097

}

964

1098

965

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

1099

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

966

1100

static void handle_sigterm(int sig){

967

1101

if(quit_now){

968

1102

return;

970

1104

quit_now = 1;

971

1105

signal_received = sig;

972

1106

int old_errno = errno;

1107

/* set main loop to exit */

973

1108

if(mc.simple_poll != NULL){

974

1109

avahi_simple_poll_quit(mc.simple_poll);

975

1110

}

976

1111

errno = old_errno;

977

1112

}

978

1113

979

/*

980

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

981

* corresponds to an acceptable network device.

982

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

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

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

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

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

994

return 0;

995

}

996

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

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

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

1002

/* read line from flags_fd */

1003

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

1004

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

1005

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

1006

if(flagstring == NULL){

1007

perror("malloc");

1008

close(flags_fd);

1009

return 0;

1010

}

1011

while(to_read > 0){

1012

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

1013

(size_t)to_read));

1014

if(ssret == -1){

1015

perror("read");

1016

free(flagstring);

1017

close(flags_fd);

1018

return 0;

1019

}

1020

to_read -= ssret;

1021

if(ssret == 0){

1022

break;

1023

}

1024

}

1025

close(flags_fd);

1026

intmax_t tmpmax;

1027

char *tmp;

1028

errno = 0;

1029

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

1030

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

1031

and not (isspace(*tmp)))

1032

or tmpmax != (ifreq_flags)tmpmax){

1114

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

1115

int ret;

1116

1117

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

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1033

1125

if(debug){

1034

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

1035

flagstring, if_entry->d_name);

1126

perror_plus("ioctl SIOCGIFFLAGS");

1036

1127

}

1037

free(flagstring);

1038

return 0;

1128

return false;

1039

1129

}

1040

free(flagstring);

1041

ifreq_flags flags = (ifreq_flags)tmpmax;

1130

return true;

1131

}

1132

1133

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

1134

1042

1135

/* Reject the loopback device */

1043

if(flags & IFF_LOOPBACK){

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1044

1137

if(debug){

1045

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

1046

if_entry->d_name);

1138

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

1139

ifname);

1047

1140

}

1048

return 0;

1141

return false;

1049

1142

}

1050

1143

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

1051

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

1144

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

1052

1145

if(debug){

1053

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

1054

if_entry->d_name);

1146

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

1147

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

1055

1148

}

1056

return 1;

1149

return true;

1057

1150

}

1058

1151

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

1059

if(not (flags & IFF_BROADCAST)){

1060

if(debug){

1061

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

1062

if_entry->d_name);

1063

}

1064

return 0;

1065

}

1152

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

1153

if(debug){

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

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

1156

}

1157

return false;

1158

}

1159

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

1160

if(ifr->ifr_flags & IFF_NOARP){

1161

if(debug){

1162

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

1163

ifname);

1164

}

1165

return false;

1166

}

1167

1066

1168

/* Accept this device */

1067

1169

if(debug){

1068

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

1069

if_entry->d_name);

1070

}

1071

return 1;

1170

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

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

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

1177

* corresponds to an acceptable network device.

1178

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

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

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

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

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

1187

if(debug){

1188

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

1189

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

1190

}

1191

return 0;

1192

}

1193

1194

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

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1243

int notdotentries(const struct dirent *direntry){

1244

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

1245

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

1246

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

1247

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

1248

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

1249

return 0;

1250

}

1251

return 1;

1252

}

1253

1254

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

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

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

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

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

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

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

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

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

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

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

1293

/* Not a regular file */

1294

if(debug){

1295

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

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not executable */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1316

int ret;

1317

struct timespec now;

1318

struct timespec waited_time;

1319

intmax_t block_time;

1320

1321

while(true){

1322

if(mc.current_server == NULL){

1323

if (debug){

1324

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

1325

" No timeout!\n");

1326

}

1327

ret = avahi_simple_poll_iterate(s, -1);

1328

} else {

1329

if (debug){

1330

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

1331

" it, or wait\n");

1332

}

1333

/* the current time */

1334

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1335

if(ret == -1){

1336

perror_plus("clock_gettime");

1337

return -1;

1338

}

1339

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

1340

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

1341

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1343

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1345

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

1346

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

1347

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

1348

block_time = ((retry_interval

1349

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

1350

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

1351

1352

if (debug){

1353

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

1354

block_time);

1355

}

1356

1357

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1362

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1364

return 0;

1365

}

1366

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1368

if(ret == -1){

1369

perror_plus("clock_gettime");

1370

return -1;

1371

}

1372

mc.current_server = mc.current_server->next;

1373

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

1374

servers, but don't block */

1375

}

1376

1377

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

1378

}

1379

if(ret != 0){

1380

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

1381

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

1382

}

1383

}

1384

}

1385

}

1386

1387

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

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1072

1512

}

1073

1513

1074

1514

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

1093

1533

bool gnutls_initialized = false;

1094

1534

bool gpgme_initialized = false;

1095

1535

float delay = 2.5f;

1536

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

1537

retrying the same server again */

1096

1538

1097

1539

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1098

1540

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1104

1546

errno = 0;

1105

1547

ret = setgid(gid);

1106

1548

if(ret == -1){

1107

perror("setgid");

1549

perror_plus("setgid");

1108

1550

}

1109

1551

1110

1552

/* Lower user privileges (temporarily) */

1111

1553

errno = 0;

1112

1554

ret = seteuid(uid);

1113

1555

if(ret == -1){

1114

perror("seteuid");

1556

perror_plus("seteuid");

1115

1557

}

1116

1558

1117

1559

if(quit_now){

1152

1594

.arg = "SECONDS",

1153

1595

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

1154

1596

.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 },

1155

1614

{ .name = NULL }

1156

1615

};

1157

1616

1158

1617

error_t parse_opt(int key, char *arg,

1159

1618

struct argp_state *state){

1619

errno = 0;

1160

1620

switch(key){

1161

1621

case 128: /* --debug */

1162

1622

debug = true;

1178

1638

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

1179

1639

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

1180

1640

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

1181

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

1182

exit(EXIT_FAILURE);

1641

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

1183

1642

}

1184

1643

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

1185

1644

break;

1190

1649

errno = 0;

1191

1650

delay = strtof(arg, &tmp);

1192

1651

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

1193

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

1194

exit(EXIT_FAILURE);

1195

}

1196

break;

1197

case ARGP_KEY_ARG:

1198

argp_usage(state);

1199

case ARGP_KEY_END:

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

1678

exit(argp_err_exit_status);

1200

1679

break;

1201

1680

default:

1202

1681

return ARGP_ERR_UNKNOWN;

1203

1682

}

1204

return 0;

1683

return errno;

1205

1684

}

1206

1685

1207

1686

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

1208

1687

.args_doc = "",

1209

1688

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

1210

1689

" passwords from a Mandos server" };

1211

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

1212

if(ret == ARGP_ERR_UNKNOWN){

1213

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

1214

exitcode = EXIT_FAILURE;

1215

goto end;

1216

}

1690

ret = argp_parse(&argp, argc, argv,

1691

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1692

switch(ret){

1693

case 0:

1694

break;

1695

case ENOMEM:

1696

default:

1697

errno = ret;

1698

perror_plus("argp_parse");

1699

exitcode = EX_OSERR;

1700

goto end;

1701

case EINVAL:

1702

exitcode = EX_USAGE;

1703

goto end;

1704

}

1705

}

1706

1707

{

1708

/* Work around Debian bug #633582:

1709

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

1710

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

1716

} else {

1717

struct stat st;

1718

1719

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

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

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

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

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)

1750

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

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

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

1772

goto end;

1217

1773

}

1218

1774

1219

1775

if(not debug){

1220

1776

avahi_set_log_function(empty_log);

1221

1777

}

1222

1778

1223

1779

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

1224

1780

struct dirent **direntries;

1225

ret = scandir(sys_class_net, &direntries, good_interface,

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1226

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1227

1790

if(ret >= 1){

1228

/* Pick the first good interface */

1791

/* Pick the first interface returned */

1229

1792

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

1230

1793

if(debug){

1231

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

1794

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

1232

1795

}

1233

1796

if(interface == NULL){

1234

perror("malloc");

1797

perror_plus("malloc");

1235

1798

free(direntries);

1236

1799

exitcode = EXIT_FAILURE;

1237

1800

goto end;

1239

1802

free(direntries);

1240

1803

} else {

1241

1804

free(direntries);

1242

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

1805

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

1243

1806

exitcode = EXIT_FAILURE;

1244

1807

goto end;

1245

1808

}

1251

1814

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

1252

1815

mc.simple_poll = avahi_simple_poll_new();

1253

1816

if(mc.simple_poll == NULL){

1254

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

1255

exitcode = EXIT_FAILURE;

1817

fprintf_plus(stderr,

1818

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

1819

exitcode = EX_UNAVAILABLE;

1256

1820

goto end;

1257

1821

}

1258

1822

1259

1823

sigemptyset(&sigterm_action.sa_mask);

1260

1824

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

1261

1825

if(ret == -1){

1262

perror("sigaddset");

1263

exitcode = EXIT_FAILURE;

1826

perror_plus("sigaddset");

1827

exitcode = EX_OSERR;

1264

1828

goto end;

1265

1829

}

1266

1830

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

1267

1831

if(ret == -1){

1268

perror("sigaddset");

1269

exitcode = EXIT_FAILURE;

1832

perror_plus("sigaddset");

1833

exitcode = EX_OSERR;

1270

1834

goto end;

1271

1835

}

1272

1836

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

1273

1837

if(ret == -1){

1274

perror("sigaddset");

1275

exitcode = EXIT_FAILURE;

1838

perror_plus("sigaddset");

1839

exitcode = EX_OSERR;

1276

1840

goto end;

1277

1841

}

1278

1842

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

1281

1845

*/

1282

1846

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

1283

1847

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1848

perror_plus("sigaction");

1849

return EX_OSERR;

1286

1850

}

1287

1851

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

1852

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

1289

1853

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1854

perror_plus("sigaction");

1855

exitcode = EX_OSERR;

1292

1856

goto end;

1293

1857

}

1294

1858

}

1295

1859

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

1296

1860

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1861

perror_plus("sigaction");

1862

return EX_OSERR;

1299

1863

}

1300

1864

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

1865

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

1302

1866

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1867

perror_plus("sigaction");

1868

exitcode = EX_OSERR;

1305

1869

goto end;

1306

1870

}

1307

1871

}

1308

1872

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

1309

1873

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1874

perror_plus("sigaction");

1875

return EX_OSERR;

1312

1876

}

1313

1877

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

1878

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

1315

1879

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1880

perror_plus("sigaction");

1881

exitcode = EX_OSERR;

1318

1882

goto end;

1319

1883

}

1320

1884

}

1323

1887

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

1324

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

1889

if(if_index == 0){

1326

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

1327

exitcode = EXIT_FAILURE;

1890

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

1891

exitcode = EX_UNAVAILABLE;

1328

1892

goto end;

1329

1893

}

1330

1894

1336

1900

errno = 0;

1337

1901

ret = seteuid(0);

1338

1902

if(ret == -1){

1339

perror("seteuid");

1903

perror_plus("seteuid");

1340

1904

}

1341

1905

1342

1906

#ifdef __linux__

1343

1907

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1344

messages to mess up the prompt */

1908

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

1345

1909

ret = klogctl(8, NULL, 5);

1346

1910

bool restore_loglevel = true;

1347

1911

if(ret == -1){

1348

1912

restore_loglevel = false;

1349

perror("klogctl");

1913

perror_plus("klogctl");

1350

1914

}

1351

1915

#endif /* __linux__ */

1352

1916

1353

1917

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1354

1918

if(sd < 0){

1355

perror("socket");

1356

exitcode = EXIT_FAILURE;

1919

perror_plus("socket");

1920

exitcode = EX_OSERR;

1357

1921

#ifdef __linux__

1358

1922

if(restore_loglevel){

1359

1923

ret = klogctl(7, NULL, 0);

1360

1924

if(ret == -1){

1361

perror("klogctl");

1925

perror_plus("klogctl");

1362

1926

}

1363

1927

}

1364

1928

#endif /* __linux__ */

1366

1930

errno = 0;

1367

1931

ret = seteuid(uid);

1368

1932

if(ret == -1){

1369

perror("seteuid");

1933

perror_plus("seteuid");

1370

1934

}

1371

1935

goto end;

1372

1936

}

1373

1937

strcpy(network.ifr_name, interface);

1374

1938

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

1375

1939

if(ret == -1){

1376

perror("ioctl SIOCGIFFLAGS");

1940

perror_plus("ioctl SIOCGIFFLAGS");

1377

1941

#ifdef __linux__

1378

1942

if(restore_loglevel){

1379

1943

ret = klogctl(7, NULL, 0);

1380

1944

if(ret == -1){

1381

perror("klogctl");

1945

perror_plus("klogctl");

1382

1946

}

1383

1947

}

1384

1948

#endif /* __linux__ */

1385

exitcode = EXIT_FAILURE;

1949

exitcode = EX_OSERR;

1386

1950

/* Lower privileges */

1387

1951

errno = 0;

1388

1952

ret = seteuid(uid);

1389

1953

if(ret == -1){

1390

perror("seteuid");

1954

perror_plus("seteuid");

1391

1955

}

1392

1956

goto end;

1393

1957

}

1397

1961

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

1398

1962

if(ret == -1){

1399

1963

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1401

exitcode = EXIT_FAILURE;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1965

exitcode = EX_OSERR;

1402

1966

#ifdef __linux__

1403

1967

if(restore_loglevel){

1404

1968

ret = klogctl(7, NULL, 0);

1405

1969

if(ret == -1){

1406

perror("klogctl");

1970

perror_plus("klogctl");

1407

1971

}

1408

1972

}

1409

1973

#endif /* __linux__ */

1411

1975

errno = 0;

1412

1976

ret = seteuid(uid);

1413

1977

if(ret == -1){

1414

perror("seteuid");

1978

perror_plus("seteuid");

1415

1979

}

1416

1980

goto end;

1417

1981

}

1418

1982

}

1419

/* sleep checking until interface is running */

1983

/* Sleep checking until interface is running.

1984

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

1420

1985

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

1421

1986

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

1422

1987

if(ret == -1){

1423

perror("ioctl SIOCGIFFLAGS");

1988

perror_plus("ioctl SIOCGIFFLAGS");

1424

1989

} else if(network.ifr_flags & IFF_RUNNING){

1425

1990

break;

1426

1991

}

1427

1992

struct timespec sleeptime = { .tv_nsec = 250000000 };

1428

1993

ret = nanosleep(&sleeptime, NULL);

1429

1994

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

1430

perror("nanosleep");

1995

perror_plus("nanosleep");

1431

1996

}

1432

1997

}

1433

1998

if(not take_down_interface){

1434

1999

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

1435

2000

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

1436

2001

if(ret == -1){

1437

perror("close");

2002

perror_plus("close");

1438

2003

}

1439

2004

}

1440

2005

#ifdef __linux__

1442

2007

/* Restores kernel loglevel to default */

1443

2008

ret = klogctl(7, NULL, 0);

1444

2009

if(ret == -1){

1445

perror("klogctl");

2010

perror_plus("klogctl");

1446

2011

}

1447

2012

}

1448

2013

#endif /* __linux__ */

1449

2014

/* Lower privileges */

1450

2015

errno = 0;

1451

if(take_down_interface){

1452

/* Lower privileges */

1453

ret = seteuid(uid);

1454

if(ret == -1){

1455

perror("seteuid");

1456

}

1457

} else {

1458

/* Lower privileges permanently */

1459

ret = setuid(uid);

1460

if(ret == -1){

1461

perror("setuid");

1462

}

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

1463

2020

}

1464

2021

}

1465

2022

1469

2026

1470

2027

ret = init_gnutls_global(pubkey, seckey);

1471

2028

if(ret == -1){

1472

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

1473

exitcode = EXIT_FAILURE;

2029

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

2030

exitcode = EX_UNAVAILABLE;

1474

2031

goto end;

1475

2032

} else {

1476

2033

gnutls_initialized = true;

1480

2037

goto end;

1481

2038

}

1482

2039

2040

if(mkdtemp(tempdir) == NULL){

2041

perror_plus("mkdtemp");

2042

goto end;

2043

}

1483

2044

tempdir_created = true;

1484

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1486

perror("mkdtemp");

1487

goto end;

1488

}

1489

2045

1490

2046

if(quit_now){

1491

2047

goto end;

1492

2048

}

1493

2049

1494

2050

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

1495

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

1496

exitcode = EXIT_FAILURE;

2051

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

2052

exitcode = EX_UNAVAILABLE;

1497

2053

goto end;

1498

2054

} else {

1499

2055

gpgme_initialized = true;

1508

2064

/* (Mainly meant for debugging) */

1509

2065

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

1510

2066

if(address == NULL){

1511

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

1512

exitcode = EXIT_FAILURE;

2067

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

2068

exitcode = EX_USAGE;

1513

2069

goto end;

1514

2070

}

1515

2071

1522

2078

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

1523

2079

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

1524

2080

or tmpmax != (uint16_t)tmpmax){

1525

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

1526

exitcode = EXIT_FAILURE;

2081

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

2082

exitcode = EX_USAGE;

1527

2083

goto end;

1528

2084

}

1529

2085

1533

2089

1534

2090

port = (uint16_t)tmpmax;

1535

2091

*address = '\0';

1536

address = connect_to;

1537

2092

/* Colon in address indicates IPv6 */

1538

2093

int af;

1539

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

2094

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

1540

2095

af = AF_INET6;

2096

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

2097

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

2098

{

2099

connect_to++;

2100

address[-1] = '\0';

2101

}

1541

2102

} else {

1542

2103

af = AF_INET;

1543

2104

}

2105

address = connect_to;

1544

2106

1545

2107

if(quit_now){

1546

2108

goto end;

1547

2109

}

1548

2110

1549

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

1550

if(ret < 0){

1551

exitcode = EXIT_FAILURE;

1552

} else {

2111

while(not quit_now){

2112

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

2113

if(quit_now or ret == 0){

2114

break;

2115

}

2116

if(debug){

2117

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

2118

(int)retry_interval);

2119

}

2120

sleep((int)retry_interval);

2121

}

2122

2123

if (not quit_now){

1553

2124

exitcode = EXIT_SUCCESS;

1554

2125

}

2126

1555

2127

goto end;

1556

2128

}

1557

2129

1579

2151

1580

2152

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

1581

2153

if(mc.server == NULL){

1582

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

1583

avahi_strerror(error));

1584

exitcode = EXIT_FAILURE;

2154

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

2155

avahi_strerror(error));

2156

exitcode = EX_UNAVAILABLE;

1585

2157

goto end;

1586

2158

}

1587

2159

1594

2166

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1595

2167

NULL, 0, browse_callback, NULL);

1596

2168

if(sb == NULL){

1597

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

1598

avahi_strerror(avahi_server_errno(mc.server)));

1599

exitcode = EXIT_FAILURE;

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

2171

exitcode = EX_UNAVAILABLE;

1600

2172

goto end;

1601

2173

}

1602

2174

1607

2179

/* Run the main loop */

1608

2180

1609

2181

if(debug){

1610

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

1611

}

1612

1613

avahi_simple_poll_loop(mc.simple_poll);

2182

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

2183

}

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2187

if(debug){

2188

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

2189

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

2190

}

1614

2191

1615

2192

end:

1616

2193

1617

2194

if(debug){

1618

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

2195

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

1619

2196

}

1620

2197

1621

2198

/* Cleanup things */

1638

2215

gpgme_release(mc.ctx);

1639

2216

}

1640

2217

1641

/* Take down the network interface */

1642

if(take_down_interface){

1643

/* Re-raise priviliges */

2218

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

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

1644

2234

errno = 0;

1645

2235

ret = seteuid(0);

1646

2236

if(ret == -1){

1647

perror("seteuid");

2237

perror_plus("seteuid");

1648

2238

}

1649

if(geteuid() == 0){

2239

2240

/* Take down the network interface */

2241

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

1650

2242

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

1651

2243

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_UP) {

1654

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

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

2246

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

1655

2247

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

1656

2248

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1658

2250

}

1659

2251

}

1660

2252

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

1661

2253

if(ret == -1){

1662

perror("close");

1663

}

1664

/* Lower privileges permanently */

1665

errno = 0;

1666

ret = setuid(uid);

1667

if(ret == -1){

1668

perror("setuid");

2254

perror_plus("close");

1669

2255

}

1670

2256

}

1671

2257

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

1672

2264

1673

/* Removes the temp directory used by GPGME */

2265

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

1674

2266

if(tempdir_created){

1675

DIR *d;

1676

struct dirent *direntry;

1677

d = opendir(tempdir);

1678

if(d == NULL){

1679

if(errno != ENOENT){

1680

perror("opendir");

1681

}

1682

} else {

1683

while(true){

1684

direntry = readdir(d);

1685

if(direntry == NULL){

1686

break;

1687

}

1688

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

1689

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

1690

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

1691

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

1692

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

1693

continue;

1694

}

2267

struct dirent **direntries = NULL;

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

1695

2274

char *fullname = NULL;

1696

2275

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

1697

2276

direntry->d_name);

1698

2277

if(ret < 0){

1699

perror("asprintf");

2278

perror_plus("asprintf");

1700

2279

continue;

1701

2280

}

1702

2281

ret = remove(fullname);

1703

2282

if(ret == -1){

1704

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

1705

strerror(errno));

2283

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

2284

strerror(errno));

1706

2285

}

1707

2286

free(fullname);

1708

2287

}

1709

closedir(d);

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

1710

2294

}

1711

2295

ret = rmdir(tempdir);

1712

2296

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

1713

perror("rmdir");

2297

perror_plus("rmdir");

1714

2298

}

1715

2299

}

1716

2300

1721

2305

&old_sigterm_action,

1722

2306

NULL));

1723

2307

if(ret == -1){

1724

perror("sigaction");

2308

perror_plus("sigaction");

1725

2309

}

1726

2310

do {

1727

2311

ret = raise(signal_received);

1728

2312

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

1729

2313

if(ret != 0){

1730

perror("raise");

2314

perror_plus("raise");

1731

2315

abort();

1732

2316

}

1733

2317

TEMP_FAILURE_RETRY(pause());