/mandos/release : revision 237.7.83

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() */

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 */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

getuid(), getgid(), setuid(),

75

setgid() */

76

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

75

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

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>";

135

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

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;

128

149

129

150

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

130

151

typedef struct {

135

156

gnutls_dh_params_t dh_params;

136

157

const char *priority;

137

158

gpgme_ctx_t ctx;

159

server *current_server;

138

160

} mandos_context;

139

161

140

162

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

141

163

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

142

164

.dh_bits = 1024, .priority = "SECURE256"

143

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

165

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

166

.current_server = NULL };

167

168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

int e = errno;

174

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

175

program_invocation_short_name);

176

errno = e;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

144

189

145

190

/*

146

191

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

148

193

* "buffer_length" is how much is already used.

149

194

*/

150

195

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

196

size_t buffer_capacity){

152

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

198

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

154

199

if(buffer == NULL){

159

204

return buffer_capacity;

160

205

}

161

206

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

233

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

162

244

/*

163

245

* Initialize GPGME.

164

246

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

167

249

gpgme_error_t rc;

168

250

gpgme_engine_info_t engine_info;

169

251

178

260

179

261

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

180

262

if(fd == -1){

181

perror("open");

263

perror_plus("open");

182

264

return false;

183

265

}

184

266

185

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

268

if(rc != GPG_ERR_NO_ERROR){

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

189

271

return false;

190

272

}

191

273

192

274

rc = gpgme_op_import(mc.ctx, pgp_data);

193

275

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

196

278

return false;

197

279

}

198

280

199

281

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

200

282

if(ret == -1){

201

perror("close");

283

perror_plus("close");

202

284

}

203

285

gpgme_data_release(pgp_data);

204

286

return true;

205

287

}

206

288

207

289

if(debug){

208

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

290

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

209

291

}

210

292

211

293

/* Init GPGME */

212

294

gpgme_check_version(NULL);

213

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

296

if(rc != GPG_ERR_NO_ERROR){

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

217

299

return false;

218

300

}

219

301

220

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

302

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

221

303

rc = gpgme_get_engine_info(&engine_info);

222

304

if(rc != GPG_ERR_NO_ERROR){

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

225

307

return false;

226

308

}

227

309

while(engine_info != NULL){

233

315

engine_info = engine_info->next;

234

316

}

235

317

if(engine_info == NULL){

236

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

318

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

319

tempdir);

237

320

return false;

238

321

}

239

322

240

323

/* Create new GPGME "context" */

241

324

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

242

325

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

245

329

return false;

246

330

}

247

331

266

350

ssize_t plaintext_length = 0;

267

351

268

352

if(debug){

269

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

353

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

270

354

}

271

355

272

356

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

273

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

358

0);

275

359

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

278

362

return -1;

279

363

}

280

364

281

365

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

282

366

rc = gpgme_data_new(&dh_plain);

283

367

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

286

371

gpgme_data_release(dh_crypto);

287

372

return -1;

288

373

}

291

376

data buffer */

292

377

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

293

378

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

296

381

plaintext_length = -1;

297

382

if(debug){

298

383

gpgme_decrypt_result_t result;

299

384

result = gpgme_op_decrypt_result(mc.ctx);

300

385

if(result == NULL){

301

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

386

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

302

387

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

307

392

if(result->file_name != NULL){

308

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

393

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

309

394

}

310

395

gpgme_recipient_t recipient;

311

396

recipient = result->recipients;

312

397

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

319

405

recipient = recipient->next;

320

406

}

321

407

}

324

410

}

325

411

326

412

if(debug){

327

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

413

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

328

414

}

329

415

330

416

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

331

417

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

332

perror("gpgme_data_seek");

418

perror_plus("gpgme_data_seek");

333

419

plaintext_length = -1;

334

420

goto decrypt_end;

335

421

}

337

423

*plaintext = NULL;

338

424

while(true){

339

425

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

342

428

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

346

432

}

347

433

348

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

439

break;

354

440

}

355

441

if(ret < 0){

356

perror("gpgme_data_read");

442

perror_plus("gpgme_data_read");

357

443

plaintext_length = -1;

358

444

goto decrypt_end;

359

445

}

361

447

}

362

448

363

449

if(debug){

364

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

450

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

365

451

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

366

452

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

367

453

}

389

475

/* GnuTLS log function callback */

390

476

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

391

477

const char* string){

392

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

478

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

393

479

}

394

480

395

481

static int init_gnutls_global(const char *pubkeyfilename,

397

483

int ret;

398

484

399

485

if(debug){

400

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

486

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

401

487

}

402

488

403

489

ret = gnutls_global_init();

404

490

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

407

493

return -1;

408

494

}

409

495

416

502

}

417

503

418

504

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

506

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

426

509

gnutls_global_deinit();

427

510

return -1;

428

511

}

429

512

430

513

if(debug){

431

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

432

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

433

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

434

518

}

435

519

436

520

ret = gnutls_certificate_set_openpgp_key_file

437

521

(mc.cred, pubkeyfilename, seckeyfilename,

438

522

GNUTLS_OPENPGP_FMT_BASE64);

439

523

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

445

529

goto globalfail;

446

530

}

447

531

448

532

/* GnuTLS server initialization */

449

533

ret = gnutls_dh_params_init(&mc.dh_params);

450

534

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

453

538

goto globalfail;

454

539

}

455

540

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

456

541

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

459

544

goto globalfail;

460

545

}

461

546

474

559

static int init_gnutls_session(gnutls_session_t *session){

475

560

int ret;

476

561

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

562

do {

563

ret = gnutls_init(session, GNUTLS_SERVER);

564

if(quit_now){

565

return -1;

566

}

567

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

478

568

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

481

572

}

482

573

483

574

{

484

575

const char *err;

485

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

576

do {

577

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

578

if(quit_now){

579

gnutls_deinit(*session);

580

return -1;

581

}

582

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

486

583

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

490

587

gnutls_deinit(*session);

491

588

return -1;

492

589

}

493

590

}

494

591

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

592

do {

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

595

if(quit_now){

596

gnutls_deinit(*session);

597

return -1;

598

}

599

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

497

600

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

500

603

gnutls_deinit(*session);

501

604

return -1;

502

605

}

503

606

504

607

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

609

508

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

611

514

616

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

515

617

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

516

618

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

619

/* Called when a Mandos server is found */

521

620

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

522

621

AvahiIfIndex if_index,

528

627

struct sockaddr_in6 in6;

529

628

} to;

530

629

char *buffer = NULL;

531

char *decrypted_buffer;

630

char *decrypted_buffer = NULL;

532

631

size_t buffer_length = 0;

533

632

size_t buffer_capacity = 0;

534

633

size_t written;

535

int retval = 0;

634

int retval = -1;

536

635

gnutls_session_t session;

537

636

int pf; /* Protocol family */

538

637

638

errno = 0;

639

539

640

if(quit_now){

641

errno = EINTR;

540

642

return -1;

541

643

}

542

644

548

650

pf = PF_INET;

549

651

break;

550

652

default:

551

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

653

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

654

errno = EINVAL;

552

655

return -1;

553

656

}

554

657

558

661

}

559

662

560

663

if(debug){

561

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

562

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

563

666

}

564

667

565

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

566

669

if(tcp_sd < 0){

567

perror("socket");

568

retval = -1;

670

int e = errno;

671

perror_plus("socket");

672

errno = e;

569

673

goto mandos_end;

570

674

}

571

675

572

676

if(quit_now){

677

errno = EINTR;

573

678

goto mandos_end;

574

679

}

575

680

582

687

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

583

688

}

584

689

if(ret < 0 ){

585

perror("inet_pton");

586

retval = -1;

690

int e = errno;

691

perror_plus("inet_pton");

692

errno = e;

587

693

goto mandos_end;

588

694

}

589

695

if(ret == 0){

590

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

591

retval = -1;

696

int e = errno;

697

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

698

errno = e;

592

699

goto mandos_end;

593

700

}

594

701

if(af == AF_INET6){

598

705

599

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

600

707

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

601

-Wunreachable-code*/

708

-Wunreachable-code*/

602

709

if(if_index == AVAHI_IF_UNSPEC){

603

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

604

" without a network interface\n");

605

retval = -1;

710

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

711

" incomplete without a network interface\n");

712

errno = EINVAL;

606

713

goto mandos_end;

607

714

}

608

715

/* Set the network interface number as scope */

615

722

}

616

723

617

724

if(quit_now){

725

errno = EINTR;

618

726

goto mandos_end;

619

727

}

620

728

622

730

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

623

731

char interface[IF_NAMESIZE];

624

732

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

625

perror("if_indextoname");

733

perror_plus("if_indextoname");

626

734

} else {

627

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

628

ip, interface, port);

735

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

736

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

629

737

}

630

738

} else {

631

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

632

port);

739

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

740

ip, port);

633

741

}

634

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

635

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

642

750

sizeof(addrstr));

643

751

}

644

752

if(pcret == NULL){

645

perror("inet_ntop");

753

perror_plus("inet_ntop");

646

754

} else {

647

755

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

648

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

756

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

649

757

}

650

758

}

651

759

}

652

760

653

761

if(quit_now){

762

errno = EINTR;

654

763

goto mandos_end;

655

764

}

656

765

660

769

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

661

770

}

662

771

if(ret < 0){

663

perror("connect");

664

retval = -1;

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

665

777

goto mandos_end;

666

778

}

667

779

668

780

if(quit_now){

781

errno = EINTR;

669

782

goto mandos_end;

670

783

}

671

784

674

787

while(true){

675

788

size_t out_size = strlen(out);

676

789

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

677

out_size - written));

790

out_size - written));

678

791

if(ret == -1){

679

perror("write");

680

retval = -1;

792

int e = errno;

793

perror_plus("write");

794

errno = e;

681

795

goto mandos_end;

682

796

}

683

797

written += (size_t)ret;

693

807

}

694

808

695

809

if(quit_now){

810

errno = EINTR;

696

811

goto mandos_end;

697

812

}

698

813

}

699

814

700

815

if(debug){

701

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

816

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

702

817

}

703

818

704

819

if(quit_now){

820

errno = EINTR;

705

821

goto mandos_end;

706

822

}

707

823

824

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

708

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

709

826

710

827

if(quit_now){

828

errno = EINTR;

711

829

goto mandos_end;

712

830

}

713

831

714

832

do {

715

833

ret = gnutls_handshake(session);

716

834

if(quit_now){

835

errno = EINTR;

717

836

goto mandos_end;

718

837

}

719

838

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

720

839

721

840

if(ret != GNUTLS_E_SUCCESS){

722

841

if(debug){

723

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

842

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

724

843

gnutls_perror(ret);

725

844

}

726

retval = -1;

845

errno = EPROTO;

727

846

goto mandos_end;

728

847

}

729

848

730

849

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

731

850

732

851

if(debug){

733

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

734

ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

735

854

}

736

855

737

856

while(true){

738

857

739

858

if(quit_now){

859

errno = EINTR;

740

860

goto mandos_end;

741

861

}

742

862

743

863

buffer_capacity = incbuffer(&buffer, buffer_length,

744

buffer_capacity);

864

buffer_capacity);

745

865

if(buffer_capacity == 0){

746

perror("incbuffer");

747

retval = -1;

866

int e = errno;

867

perror_plus("incbuffer");

868

errno = e;

748

869

goto mandos_end;

749

870

}

750

871

751

872

if(quit_now){

873

errno = EINTR;

752

874

goto mandos_end;

753

875

}

754

876

767

889

ret = gnutls_handshake(session);

768

890

769

891

if(quit_now){

892

errno = EINTR;

770

893

goto mandos_end;

771

894

}

772

895

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

773

896

if(ret < 0){

774

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

897

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

898

"***\n");

775

899

gnutls_perror(ret);

776

retval = -1;

900

errno = EPROTO;

777

901

goto mandos_end;

778

902

}

779

903

break;

780

904

default:

781

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

782

" encrypted session with Mandos server\n");

783

retval = -1;

905

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

906

" encrypted session with Mandos server\n");

784

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

errno = EIO;

785

909

goto mandos_end;

786

910

}

787

911

} else {

790

914

}

791

915

792

916

if(debug){

793

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

794

}

795

796

if(quit_now){

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

917

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

918

}

919

920

if(quit_now){

921

errno = EINTR;

922

goto mandos_end;

923

}

924

925

do {

926

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

927

if(quit_now){

928

errno = EINTR;

929

goto mandos_end;

930

}

931

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

805

932

806

933

if(buffer_length > 0){

807

934

ssize_t decrypted_buffer_size;

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

810

936

&decrypted_buffer);

811

937

if(decrypted_buffer_size >= 0){

812

938

813

939

written = 0;

814

940

while(written < (size_t) decrypted_buffer_size){

815

941

if(quit_now){

942

errno = EINTR;

816

943

goto mandos_end;

817

944

}

818

945

820

947

(size_t)decrypted_buffer_size - written,

821

948

stdout);

822

949

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

950

int e = errno;

823

951

if(debug){

824

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

825

strerror(errno));

952

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

953

strerror(errno));

826

954

}

827

retval = -1;

828

break;

955

errno = e;

956

goto mandos_end;

829

957

}

830

958

written += (size_t)ret;

831

959

}

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

960

retval = 0;

835

961

}

836

} else {

837

retval = -1;

838

962

}

839

963

840

964

/* Shutdown procedure */

841

965

842

966

mandos_end:

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

967

{

968

int e = errno;

969

free(decrypted_buffer);

970

free(buffer);

971

if(tcp_sd >= 0){

972

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

973

}

974

if(ret == -1){

975

if(e == 0){

976

e = errno;

977

}

978

perror_plus("close");

979

}

980

gnutls_deinit(session);

981

errno = e;

982

if(quit_now){

983

errno = EINTR;

984

retval = -1;

985

}

853

986

}

854

987

return retval;

855

988

}

880

1013

switch(event){

881

1014

default:

882

1015

case AVAHI_RESOLVER_FAILURE:

883

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

884

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

885

avahi_strerror(avahi_server_errno(mc.server)));

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

886

1020

break;

887

1021

888

1022

case AVAHI_RESOLVER_FOUND:

890

1024

char ip[AVAHI_ADDRESS_STR_MAX];

891

1025

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

892

1026

if(debug){

893

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

894

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

895

ip, (intmax_t)interface, port);

1027

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

1028

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

1029

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

896

1030

}

897

1031

int ret = start_mandos_communication(ip, port, interface,

898

1032

avahi_proto_to_af(proto));

899

1033

if(ret == 0){

900

1034

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

901

1041

}

902

1042

}

903

1043

}

927

1067

default:

928

1068

case AVAHI_BROWSER_FAILURE:

929

1069

930

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

931

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

932

1072

avahi_simple_poll_quit(mc.simple_poll);

933

1073

return;

934

1074

941

1081

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

942

1082

name, type, domain, protocol, 0,

943

1083

resolve_callback, NULL) == NULL)

944

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

945

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

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

946

1087

break;

947

1088

948

1089

case AVAHI_BROWSER_REMOVE:

951

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

952

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

953

1094

if(debug){

954

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

1095

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

1096

" searching...\n");

955

1097

}

956

1098

break;

957

1099

}

958

1100

}

959

1101

960

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

1102

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

961

1103

static void handle_sigterm(int sig){

962

1104

if(quit_now){

963

1105

return;

965

1107

quit_now = 1;

966

1108

signal_received = sig;

967

1109

int old_errno = errno;

1110

/* set main loop to exit */

968

1111

if(mc.simple_poll != NULL){

969

1112

avahi_simple_poll_quit(mc.simple_poll);

970

1113

}

971

1114

errno = old_errno;

972

1115

}

973

1116

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1128

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1130

}

1131

return false;

1132

}

1133

return true;

1134

}

1135

1136

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

1137

1138

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1140

if(debug){

1141

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

1142

ifname);

1143

}

1144

return false;

1145

}

1146

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

1147

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

1148

if(debug){

1149

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

1150

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

1151

}

1152

return true;

1153

}

1154

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

1155

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

1156

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1159

}

1160

return false;

1161

}

1162

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

1163

if(ifr->ifr_flags & IFF_NOARP){

1164

if(debug){

1165

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

1166

ifname);

1167

}

1168

return false;

1169

}

1170

1171

/* Accept this device */

1172

if(debug){

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1246

int notdotentries(const struct dirent *direntry){

1247

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

1248

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

1249

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

1250

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

1251

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

1252

return 0;

1253

}

1254

return 1;

1255

}

1256

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

int ret;

1320

struct timespec now;

1321

struct timespec waited_time;

1322

intmax_t block_time;

1323

1324

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1327

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

1328

" No timeout!\n");

1329

}

1330

ret = avahi_simple_poll_iterate(s, -1);

1331

} else {

1332

if (debug){

1333

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

1334

" it, or wait\n");

1335

}

1336

/* the current time */

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1338

if(ret == -1){

1339

perror_plus("clock_gettime");

1340

return -1;

1341

}

1342

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

1343

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

1344

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1346

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1348

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

1349

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

1350

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

1351

block_time = ((retry_interval

1352

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

1353

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

1354

1355

if (debug){

1356

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

1357

block_time);

1358

}

1359

1360

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1365

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1367

return 0;

1368

}

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1371

if(ret == -1){

1372

perror_plus("clock_gettime");

1373

return -1;

1374

}

1375

mc.current_server = mc.current_server->next;

1376

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

1377

servers, but don't block */

1378

}

1379

1380

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

1381

}

1382

if(ret != 0){

1383

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

1384

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

1385

}

1386

}

1387

}

1388

}

1389

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1517

}

1518

974

1519

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

975

1520

AvahiSServiceBrowser *sb = NULL;

976

1521

int error;

978

1523

intmax_t tmpmax;

979

1524

char *tmp;

980

1525

int exitcode = EXIT_SUCCESS;

981

const char *interface = "eth0";

1526

const char *interface = "";

982

1527

struct ifreq network;

983

1528

int sd = -1;

984

1529

bool take_down_interface = false;

985

1530

uid_t uid;

986

1531

gid_t gid;

987

char *connect_to = NULL;

988

1532

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

989

1533

bool tempdir_created = false;

990

1534

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

994

1538

bool gnutls_initialized = false;

995

1539

bool gpgme_initialized = false;

996

1540

float delay = 2.5f;

1541

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

1542

retrying the same server again */

997

1543

998

struct sigaction old_sigterm_action;

1544

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

999

1545

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1000

1546

1547

uid = getuid();

1548

gid = getgid();

1549

1550

/* Lower any group privileges we might have, just to be safe */

1551

errno = 0;

1552

ret = setgid(gid);

1553

if(ret == -1){

1554

perror_plus("setgid");

1555

}

1556

1557

/* Lower user privileges (temporarily) */

1558

errno = 0;

1559

ret = seteuid(uid);

1560

if(ret == -1){

1561

perror_plus("seteuid");

1562

}

1563

1564

if(quit_now){

1565

goto end;

1566

}

1567

1001

1568

{

1002

1569

struct argp_option options[] = {

1003

1570

{ .name = "debug", .key = 128,

1032

1599

.arg = "SECONDS",

1033

1600

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

1034

1601

.group = 2 },

1602

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

1603

.arg = "SECONDS",

1604

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

1605

.group = 2 },

1606

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

1607

.arg = "DIR",

1608

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

1609

.group = 2 },

1610

/*

1611

* These reproduce what we would get without ARGP_NO_HELP

1612

*/

1613

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

1614

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

1615

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

1616

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

1617

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

1618

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

1035

1619

{ .name = NULL }

1036

1620

};

1037

1621

1038

1622

error_t parse_opt(int key, char *arg,

1039

1623

struct argp_state *state){

1624

errno = 0;

1040

1625

switch(key){

1041

1626

case 128: /* --debug */

1042

1627

debug = true;

1058

1643

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

1059

1644

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

1060

1645

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

1061

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

1062

exit(EXIT_FAILURE);

1646

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

1063

1647

}

1064

1648

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

1065

1649

break;

1070

1654

errno = 0;

1071

1655

delay = strtof(arg, &tmp);

1072

1656

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

1073

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

1074

exit(EXIT_FAILURE);

1075

}

1076

break;

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1657

argp_error(state, "Bad delay");

1658

}

1659

case 132: /* --retry */

1660

errno = 0;

1661

retry_interval = strtod(arg, &tmp);

1662

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

1663

or (retry_interval * 1000) > INT_MAX

1664

or retry_interval < 0){

1665

argp_error(state, "Bad retry interval");

1666

}

1667

break;

1668

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

1669

hookdir = arg;

1670

break;

1671

/*

1672

* These reproduce what we would get without ARGP_NO_HELP

1673

*/

1674

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

1675

argp_state_help(state, state->out_stream,

1676

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1677

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1678

case -3: /* --usage */

1679

argp_state_help(state, state->out_stream,

1680

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1681

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

1682

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

1683

exit(argp_err_exit_status);

1080

1684

break;

1081

1685

default:

1082

1686

return ARGP_ERR_UNKNOWN;

1083

1687

}

1084

return 0;

1688

return errno;

1085

1689

}

1086

1690

1087

1691

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

1088

1692

.args_doc = "",

1089

1693

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

1090

1694

" passwords from a Mandos server" };

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1095

goto end;

1096

}

1695

ret = argp_parse(&argp, argc, argv,

1696

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1697

switch(ret){

1698

case 0:

1699

break;

1700

case ENOMEM:

1701

default:

1702

errno = ret;

1703

perror_plus("argp_parse");

1704

exitcode = EX_OSERR;

1705

goto end;

1706

case EINVAL:

1707

exitcode = EX_USAGE;

1708

goto end;

1709

}

1710

}

1711

1712

{

1713

/* Work around Debian bug #633582:

1714

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

1715

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1722

struct stat st;

1723

1724

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

1725

int seckey_fd = open(seckey, O_RDONLY);

1726

if(seckey_fd == -1){

1727

perror_plus("open");

1728

} else {

1729

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

1730

if(ret == -1){

1731

perror_plus("fstat");

1732

} else {

1733

if(S_ISREG(st.st_mode)

1734

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

1735

ret = fchown(seckey_fd, uid, gid);

1736

if(ret == -1){

1737

perror_plus("fchown");

1738

}

1739

}

1740

}

1741

TEMP_FAILURE_RETRY(close(seckey_fd));

1742

}

1743

}

1744

1745

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

1746

int pubkey_fd = open(pubkey, O_RDONLY);

1747

if(pubkey_fd == -1){

1748

perror_plus("open");

1749

} else {

1750

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

1751

if(ret == -1){

1752

perror_plus("fstat");

1753

} else {

1754

if(S_ISREG(st.st_mode)

1755

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

1756

ret = fchown(pubkey_fd, uid, gid);

1757

if(ret == -1){

1758

perror_plus("fchown");

1759

}

1760

}

1761

}

1762

TEMP_FAILURE_RETRY(close(pubkey_fd));

1763

}

1764

}

1765

1766

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

1771

}

1772

}

1773

}

1774

1775

/* Run network hooks */

1776

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

1777

goto end;

1097

1778

}

1098

1779

1099

1780

if(not debug){

1100

1781

avahi_set_log_function(empty_log);

1101

1782

}

1102

1783

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1103

1816

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

1104

1817

from the signal handler */

1105

1818

/* Initialize the pseudo-RNG for Avahi */

1106

1819

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

1107

1820

mc.simple_poll = avahi_simple_poll_new();

1108

1821

if(mc.simple_poll == NULL){

1109

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

1110

exitcode = EXIT_FAILURE;

1822

fprintf_plus(stderr,

1823

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

1824

exitcode = EX_UNAVAILABLE;

1111

1825

goto end;

1112

1826

}

1113

1827

1114

1828

sigemptyset(&sigterm_action.sa_mask);

1115

1829

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

1116

1830

if(ret == -1){

1117

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1119

1833

goto end;

1120

1834

}

1121

1835

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

1122

1836

if(ret == -1){

1123

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1125

1839

goto end;

1126

1840

}

1127

1841

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

1128

1842

if(ret == -1){

1129

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

1843

perror_plus("sigaddset");

1844

exitcode = EX_OSERR;

1131

1845

goto end;

1132

1846

}

1133

1847

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

1136

1850

*/

1137

1851

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

1138

1852

if(ret == -1){

1139

perror("sigaction");

1140

return EXIT_FAILURE;

1853

perror_plus("sigaction");

1854

return EX_OSERR;

1141

1855

}

1142

1856

if(old_sigterm_action.sa_handler != SIG_IGN){

1143

1857

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

1144

1858

if(ret == -1){

1145

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

1859

perror_plus("sigaction");

1860

exitcode = EX_OSERR;

1147

1861

goto end;

1148

1862

}

1149

1863

}

1150

1864

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

1151

1865

if(ret == -1){

1152

perror("sigaction");

1153

return EXIT_FAILURE;

1866

perror_plus("sigaction");

1867

return EX_OSERR;

1154

1868

}

1155

1869

if(old_sigterm_action.sa_handler != SIG_IGN){

1156

1870

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

1157

1871

if(ret == -1){

1158

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

1872

perror_plus("sigaction");

1873

exitcode = EX_OSERR;

1160

1874

goto end;

1161

1875

}

1162

1876

}

1163

1877

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

1164

1878

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1879

perror_plus("sigaction");

1880

return EX_OSERR;

1167

1881

}

1168

1882

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1883

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

1170

1884

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1885

perror_plus("sigaction");

1886

exitcode = EX_OSERR;

1173

1887

goto end;

1174

1888

}

1175

1889

}

1176

1890

1177

1891

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

1178

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

1892

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

1179

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1180

1894

if(if_index == 0){

1181

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

1182

exitcode = EXIT_FAILURE;

1895

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

1896

exitcode = EX_UNAVAILABLE;

1183

1897

goto end;

1184

1898

}

1185

1899

1187

1901

goto end;

1188

1902

}

1189

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1190

1911

#ifdef __linux__

1191

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1192

messages to mess up the prompt */

1913

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

1193

1914

ret = klogctl(8, NULL, 5);

1194

1915

bool restore_loglevel = true;

1195

1916

if(ret == -1){

1196

1917

restore_loglevel = false;

1197

perror("klogctl");

1918

perror_plus("klogctl");

1198

1919

}

1199

1920

#endif /* __linux__ */

1200

1921

1201

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1202

1923

if(sd < 0){

1203

perror("socket");

1204

exitcode = EXIT_FAILURE;

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1205

1926

#ifdef __linux__

1206

1927

if(restore_loglevel){

1207

1928

ret = klogctl(7, NULL, 0);

1208

1929

if(ret == -1){

1209

perror("klogctl");

1930

perror_plus("klogctl");

1210

1931

}

1211

1932

}

1212

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1213

1940

goto end;

1214

1941

}

1215

1942

strcpy(network.ifr_name, interface);

1216

1943

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

1217

1944

if(ret == -1){

1218

perror("ioctl SIOCGIFFLAGS");

1945

perror_plus("ioctl SIOCGIFFLAGS");

1219

1946

#ifdef __linux__

1220

1947

if(restore_loglevel){

1221

1948

ret = klogctl(7, NULL, 0);

1222

1949

if(ret == -1){

1223

perror("klogctl");

1950

perror_plus("klogctl");

1224

1951

}

1225

1952

}

1226

1953

#endif /* __linux__ */

1227

exitcode = EXIT_FAILURE;

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1228

1961

goto end;

1229

1962

}

1230

1963

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

1233

1966

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

1234

1967

if(ret == -1){

1235

1968

take_down_interface = false;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1238

1971

#ifdef __linux__

1239

1972

if(restore_loglevel){

1240

1973

ret = klogctl(7, NULL, 0);

1241

1974

if(ret == -1){

1242

perror("klogctl");

1975

perror_plus("klogctl");

1243

1976

}

1244

1977

}

1245

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1246

1985

goto end;

1247

1986

}

1248

1987

}

1249

/* sleep checking until interface is running */

1988

/* Sleep checking until interface is running.

1989

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

1250

1990

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

1251

1991

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

1252

1992

if(ret == -1){

1253

perror("ioctl SIOCGIFFLAGS");

1993

perror_plus("ioctl SIOCGIFFLAGS");

1254

1994

} else if(network.ifr_flags & IFF_RUNNING){

1255

1995

break;

1256

1996

}

1257

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1258

1998

ret = nanosleep(&sleeptime, NULL);

1259

1999

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

1260

perror("nanosleep");

2000

perror_plus("nanosleep");

1261

2001

}

1262

2002

}

1263

2003

if(not take_down_interface){

1264

2004

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

1265

2005

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

1266

2006

if(ret == -1){

1267

perror("close");

2007

perror_plus("close");

1268

2008

}

1269

2009

}

1270

2010

#ifdef __linux__

1272

2012

/* Restores kernel loglevel to default */

1273

2013

ret = klogctl(7, NULL, 0);

1274

2014

if(ret == -1){

1275

perror("klogctl");

2015

perror_plus("klogctl");

1276

2016

}

1277

2017

}

1278

2018

#endif /* __linux__ */

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

1297

2026

}

1298

2027

1299

2028

if(quit_now){

1302

2031

1303

2032

ret = init_gnutls_global(pubkey, seckey);

1304

2033

if(ret == -1){

1305

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

1306

exitcode = EXIT_FAILURE;

2034

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

2035

exitcode = EX_UNAVAILABLE;

1307

2036

goto end;

1308

2037

} else {

1309

2038

gnutls_initialized = true;

1313

2042

goto end;

1314

2043

}

1315

2044

2045

if(mkdtemp(tempdir) == NULL){

2046

perror_plus("mkdtemp");

2047

goto end;

2048

}

1316

2049

tempdir_created = true;

1317

if(mkdtemp(tempdir) == NULL){

1318

tempdir_created = false;

1319

perror("mkdtemp");

1320

goto end;

1321

}

1322

2050

1323

2051

if(quit_now){

1324

2052

goto end;

1325

2053

}

1326

2054

1327

2055

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

1328

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

1329

exitcode = EXIT_FAILURE;

2056

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

2057

exitcode = EX_UNAVAILABLE;

1330

2058

goto end;

1331

2059

} else {

1332

2060

gpgme_initialized = true;

1341

2069

/* (Mainly meant for debugging) */

1342

2070

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

1343

2071

if(address == NULL){

1344

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

1345

exitcode = EXIT_FAILURE;

2072

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

2073

exitcode = EX_USAGE;

1346

2074

goto end;

1347

2075

}

1348

2076

1355

2083

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

1356

2084

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

1357

2085

or tmpmax != (uint16_t)tmpmax){

1358

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

1359

exitcode = EXIT_FAILURE;

2086

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

2087

exitcode = EX_USAGE;

1360

2088

goto end;

1361

2089

}

1362

2090

1366

2094

1367

2095

port = (uint16_t)tmpmax;

1368

2096

*address = '\0';

1369

address = connect_to;

1370

2097

/* Colon in address indicates IPv6 */

1371

2098

int af;

1372

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

2099

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

1373

2100

af = AF_INET6;

2101

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

2102

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

2103

{

2104

connect_to++;

2105

address[-1] = '\0';

2106

}

1374

2107

} else {

1375

2108

af = AF_INET;

1376

2109

}

2110

address = connect_to;

1377

2111

1378

2112

if(quit_now){

1379

2113

goto end;

1380

2114

}

1381

2115

1382

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

1383

if(ret < 0){

1384

exitcode = EXIT_FAILURE;

1385

} else {

2116

while(not quit_now){

2117

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

2118

if(quit_now or ret == 0){

2119

break;

2120

}

2121

if(debug){

2122

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

2123

(int)retry_interval);

2124

}

2125

sleep((int)retry_interval);

2126

}

2127

2128

if (not quit_now){

1386

2129

exitcode = EXIT_SUCCESS;

1387

2130

}

2131

1388

2132

goto end;

1389

2133

}

1390

2134

1412

2156

1413

2157

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

1414

2158

if(mc.server == NULL){

1415

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

1416

avahi_strerror(error));

1417

exitcode = EXIT_FAILURE;

2159

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

2160

avahi_strerror(error));

2161

exitcode = EX_UNAVAILABLE;

1418

2162

goto end;

1419

2163

}

1420

2164

1427

2171

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1428

2172

NULL, 0, browse_callback, NULL);

1429

2173

if(sb == NULL){

1430

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

1431

avahi_strerror(avahi_server_errno(mc.server)));

1432

exitcode = EXIT_FAILURE;

2174

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

2175

avahi_strerror(avahi_server_errno(mc.server)));

2176

exitcode = EX_UNAVAILABLE;

1433

2177

goto end;

1434

2178

}

1435

2179

1440

2184

/* Run the main loop */

1441

2185

1442

2186

if(debug){

1443

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

1444

}

1445

1446

avahi_simple_poll_loop(mc.simple_poll);

2187

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

2188

}

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2192

if(debug){

2193

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

2194

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

2195

}

1447

2196

1448

2197

end:

1449

2198

1450

2199

if(debug){

1451

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

2200

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

1452

2201

}

1453

2202

1454

2203

/* Cleanup things */

1471

2220

gpgme_release(mc.ctx);

1472

2221

}

1473

2222

1474

/* Take down the network interface */

1475

if(take_down_interface){

1476

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

1477

if(ret == -1){

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1485

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1489

}

1490

}

1491

1492

/* Removes the temp directory used by GPGME */

2223

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

2224

has seen */

2225

if(mc.current_server != NULL){

2226

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

2227

while(mc.current_server != NULL){

2228

server *next = mc.current_server->next;

2229

free(mc.current_server);

2230

mc.current_server = next;

2231

}

2232

}

2233

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2238

{

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2243

}

2244

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2255

}

2256

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2261

}

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2269

2270

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

1493

2271

if(tempdir_created){

1494

DIR *d;

1495

struct dirent *direntry;

1496

d = opendir(tempdir);

1497

if(d == NULL){

1498

if(errno != ENOENT){

1499

perror("opendir");

1500

}

1501

} else {

1502

while(true){

1503

direntry = readdir(d);

1504

if(direntry == NULL){

1505

break;

1506

}

1507

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

1508

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

1509

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

1510

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

1511

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

1512

continue;

1513

}

2272

struct dirent **direntries = NULL;

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

1514

2279

char *fullname = NULL;

1515

2280

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

1516

2281

direntry->d_name);

1517

2282

if(ret < 0){

1518

perror("asprintf");

2283

perror_plus("asprintf");

1519

2284

continue;

1520

2285

}

1521

2286

ret = remove(fullname);

1522

2287

if(ret == -1){

1523

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

1524

strerror(errno));

2288

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

2289

strerror(errno));

1525

2290

}

1526

2291

free(fullname);

1527

2292

}

1528

closedir(d);

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

1529

2299

}

1530

2300

ret = rmdir(tempdir);

1531

2301

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

1532

perror("rmdir");

2302

perror_plus("rmdir");

1533

2303

}

1534

2304

}

1535

2305

1536

2306

if(quit_now){

1537

2307

sigemptyset(&old_sigterm_action.sa_mask);

1538

2308

old_sigterm_action.sa_handler = SIG_DFL;

1539

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

2309

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2310

&old_sigterm_action,

2311

NULL));

1540

2312

if(ret == -1){

1541

perror("sigaction");

1542

}

1543

raise(signal_received);

2313

perror_plus("sigaction");

2314

}

2315

do {

2316

ret = raise(signal_received);

2317

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

2318

if(ret != 0){

2319

perror_plus("raise");

2320

abort();

2321

}

2322

TEMP_FAILURE_RETRY(pause());

1544

2323

}

1545

2324

1546

2325

return exitcode;