/mandos/release : revision 237.2.129

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

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

47

strtof(), abort() */

46

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

47

srand(), strtof() */

48

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

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(), S_ISREG */

56

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

57

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

58

inet_pton(), connect() */

59

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

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

73

72

*/

74

73

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

75

74

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

76

setgid(), pause() */

77

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

75

setgid() */

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

83

82

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

84

83

sigaction(), SIGTERM, sig_atomic_t,

85

84

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

85

91

86

#ifdef __linux__

92

87

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

110

105

init_gnutls_session(),

111

106

GNUTLS_* */

112

107

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

115

110

116

111

/* GPGME */

117

112

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

125

120

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

126

121

#define SECKEY "seckey.txt"

127

122

#define PUBKEY "pubkey.txt"

128

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

129

123

130

124

bool debug = false;

131

125

static const char mandos_protocol_version[] = "1";

132

126

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

133

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

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

127

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

148

128

149

129

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

150

130

typedef struct {

155

135

gnutls_dh_params_t dh_params;

156

136

const char *priority;

157

137

gpgme_ctx_t ctx;

158

server *current_server;

159

138

} mandos_context;

160

139

161

140

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

162

141

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

163

142

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

166

167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

143

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

185

144

186

145

/*

187

146

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

189

148

* "buffer_length" is how much is already used.

190

149

*/

191

150

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

151

size_t buffer_capacity){

193

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

153

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

195

154

if(buffer == NULL){

200

159

return buffer_capacity;

201

160

}

202

161

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

240

162

/*

241

163

* Initialize GPGME.

242

164

*/

243

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

244

const char *tempdir){

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

245

167

gpgme_error_t rc;

246

168

gpgme_engine_info_t engine_info;

247

169

256

178

257

179

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

258

180

if(fd == -1){

259

perror_plus("open");

181

perror("open");

260

182

return false;

261

183

}

262

184

263

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

186

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

267

189

return false;

268

190

}

269

191

270

192

rc = gpgme_op_import(mc.ctx, pgp_data);

271

193

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

274

196

return false;

275

197

}

276

198

277

199

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

278

200

if(ret == -1){

279

perror_plus("close");

201

perror("close");

280

202

}

281

203

gpgme_data_release(pgp_data);

282

204

return true;

283

205

}

284

206

285

207

if(debug){

286

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

208

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

287

209

}

288

210

289

211

/* Init GPGME */

290

212

gpgme_check_version(NULL);

291

213

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

214

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

295

217

return false;

296

218

}

297

219

298

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

220

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

299

221

rc = gpgme_get_engine_info(&engine_info);

300

222

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

303

225

return false;

304

226

}

305

227

while(engine_info != NULL){

311

233

engine_info = engine_info->next;

312

234

}

313

235

if(engine_info == NULL){

314

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

315

tempdir);

236

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

316

237

return false;

317

238

}

318

239

319

240

/* Create new GPGME "context" */

320

241

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

321

242

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

325

245

return false;

326

246

}

327

247

346

266

ssize_t plaintext_length = 0;

347

267

348

268

if(debug){

349

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

269

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

350

270

}

351

271

352

272

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

353

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

274

0);

355

275

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

358

278

return -1;

359

279

}

360

280

361

281

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

362

282

rc = gpgme_data_new(&dh_plain);

363

283

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

367

286

gpgme_data_release(dh_crypto);

368

287

return -1;

369

288

}

372

291

data buffer */

373

292

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

374

293

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

377

296

plaintext_length = -1;

378

297

if(debug){

379

298

gpgme_decrypt_result_t result;

380

299

result = gpgme_op_decrypt_result(mc.ctx);

381

300

if(result == NULL){

382

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

301

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

383

302

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

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

307

if(result->file_name != NULL){

389

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

308

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

390

309

}

391

310

gpgme_recipient_t recipient;

392

311

recipient = result->recipients;

393

312

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

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");

401

319

recipient = recipient->next;

402

320

}

403

321

}

406

324

}

407

325

408

326

if(debug){

409

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

327

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

410

328

}

411

329

412

330

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

413

331

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

414

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

415

333

plaintext_length = -1;

416

334

goto decrypt_end;

417

335

}

419

337

*plaintext = NULL;

420

338

while(true){

421

339

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

424

342

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

428

346

}

429

347

430

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

353

break;

436

354

}

437

355

if(ret < 0){

438

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

439

357

plaintext_length = -1;

440

358

goto decrypt_end;

441

359

}

443

361

}

444

362

445

363

if(debug){

446

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

364

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

447

365

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

448

366

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

449

367

}

471

389

/* GnuTLS log function callback */

472

390

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

473

391

const char* string){

474

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

392

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

475

393

}

476

394

477

395

static int init_gnutls_global(const char *pubkeyfilename,

479

397

int ret;

480

398

481

399

if(debug){

482

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

400

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

483

401

}

484

402

485

403

ret = gnutls_global_init();

486

404

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

405

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

406

safer_gnutls_strerror(ret));

489

407

return -1;

490

408

}

491

409

498

416

}

499

417

500

418

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

502

420

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

505

426

gnutls_global_deinit();

506

427

return -1;

507

428

}

508

429

509

430

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

431

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

432

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

433

seckeyfilename);

514

434

}

515

435

516

436

ret = gnutls_certificate_set_openpgp_key_file

517

437

(mc.cred, pubkeyfilename, seckeyfilename,

518

438

GNUTLS_OPENPGP_FMT_BASE64);

519

439

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

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));

525

445

goto globalfail;

526

446

}

527

447

528

448

/* GnuTLS server initialization */

529

449

ret = gnutls_dh_params_init(&mc.dh_params);

530

450

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

451

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

452

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

534

453

goto globalfail;

535

454

}

536

455

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

537

456

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

457

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

458

safer_gnutls_strerror(ret));

540

459

goto globalfail;

541

460

}

542

461

555

474

static int init_gnutls_session(gnutls_session_t *session){

556

475

int ret;

557

476

/* GnuTLS session creation */

558

do {

559

ret = gnutls_init(session, GNUTLS_SERVER);

560

if(quit_now){

561

return -1;

562

}

563

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

564

478

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

479

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

480

safer_gnutls_strerror(ret));

568

481

}

569

482

570

483

{

571

484

const char *err;

572

do {

573

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

574

if(quit_now){

575

gnutls_deinit(*session);

576

return -1;

577

}

578

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

485

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

579

486

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

487

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

488

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

489

safer_gnutls_strerror(ret));

583

490

gnutls_deinit(*session);

584

491

return -1;

585

492

}

586

493

}

587

494

588

do {

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

591

if(quit_now){

592

gnutls_deinit(*session);

593

return -1;

594

}

595

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

596

497

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

498

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

499

safer_gnutls_strerror(ret));

599

500

gnutls_deinit(*session);

600

501

return -1;

601

502

}

602

503

603

504

/* ignore client certificate if any. */

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

605

507

606

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

607

509

612

514

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

613

515

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

614

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

615

520

/* Called when a Mandos server is found */

616

521

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

617

522

AvahiIfIndex if_index,

623

528

struct sockaddr_in6 in6;

624

529

} to;

625

530

char *buffer = NULL;

626

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

627

532

size_t buffer_length = 0;

628

533

size_t buffer_capacity = 0;

629

534

size_t written;

630

int retval = -1;

535

int retval = 0;

631

536

gnutls_session_t session;

632

537

int pf; /* Protocol family */

633

538

634

errno = 0;

635

636

539

if(quit_now){

637

errno = EINTR;

638

540

return -1;

639

541

}

640

542

646

548

pf = PF_INET;

647

549

break;

648

550

default:

649

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

650

errno = EINVAL;

551

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

651

552

return -1;

652

553

}

653

554

657

558

}

658

559

659

560

if(debug){

660

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

661

PRIu16 "\n", ip, port);

561

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

562

"\n", ip, port);

662

563

}

663

564

664

565

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

566

if(tcp_sd < 0){

666

int e = errno;

667

perror_plus("socket");

668

errno = e;

567

perror("socket");

568

retval = -1;

669

569

goto mandos_end;

670

570

}

671

571

672

572

if(quit_now){

673

errno = EINTR;

674

573

goto mandos_end;

675

574

}

676

575

683

582

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

684

583

}

685

584

if(ret < 0 ){

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

585

perror("inet_pton");

586

retval = -1;

689

587

goto mandos_end;

690

588

}

691

589

if(ret == 0){

692

int e = errno;

693

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

694

errno = e;

590

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

591

retval = -1;

695

592

goto mandos_end;

696

593

}

697

594

if(af == AF_INET6){

701

598

702

599

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

600

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

704

-Wunreachable-code*/

601

-Wunreachable-code*/

705

602

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

708

errno = EINVAL;

603

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

604

" without a network interface\n");

605

retval = -1;

709

606

goto mandos_end;

710

607

}

711

608

/* Set the network interface number as scope */

718

615

}

719

616

720

617

if(quit_now){

721

errno = EINTR;

722

618

goto mandos_end;

723

619

}

724

620

726

622

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

727

623

char interface[IF_NAMESIZE];

728

624

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

729

perror_plus("if_indextoname");

625

perror("if_indextoname");

730

626

} else {

731

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

732

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

627

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

628

ip, interface, port);

733

629

}

734

630

} else {

735

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

736

ip, port);

631

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

632

port);

737

633

}

738

634

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

635

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

642

sizeof(addrstr));

747

643

}

748

644

if(pcret == NULL){

749

perror_plus("inet_ntop");

645

perror("inet_ntop");

750

646

} else {

751

647

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

752

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

648

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

753

649

}

754

650

}

755

651

}

756

652

757

653

if(quit_now){

758

errno = EINTR;

759

654

goto mandos_end;

760

655

}

761

656

765

660

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

766

661

}

767

662

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

663

perror("connect");

664

retval = -1;

773

665

goto mandos_end;

774

666

}

775

667

776

668

if(quit_now){

777

errno = EINTR;

778

669

goto mandos_end;

779

670

}

780

671

783

674

while(true){

784

675

size_t out_size = strlen(out);

785

676

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

786

out_size - written));

677

out_size - written));

787

678

if(ret == -1){

788

int e = errno;

789

perror_plus("write");

790

errno = e;

679

perror("write");

680

retval = -1;

791

681

goto mandos_end;

792

682

}

793

683

written += (size_t)ret;

803

693

}

804

694

805

695

if(quit_now){

806

errno = EINTR;

807

696

goto mandos_end;

808

697

}

809

698

}

810

699

811

700

if(debug){

812

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

701

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

813

702

}

814

703

815

704

if(quit_now){

816

errno = EINTR;

817

705

goto mandos_end;

818

706

}

819

707

820

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

821

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

709

823

710

if(quit_now){

824

errno = EINTR;

825

711

goto mandos_end;

826

712

}

827

713

828

714

do {

829

715

ret = gnutls_handshake(session);

830

716

if(quit_now){

831

errno = EINTR;

832

717

goto mandos_end;

833

718

}

834

719

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

835

720

836

721

if(ret != GNUTLS_E_SUCCESS){

837

722

if(debug){

838

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

723

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

839

724

gnutls_perror(ret);

840

725

}

841

errno = EPROTO;

726

retval = -1;

842

727

goto mandos_end;

843

728

}

844

729

845

730

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

846

731

847

732

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

733

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

734

ip);

850

735

}

851

736

852

737

while(true){

853

738

854

739

if(quit_now){

855

errno = EINTR;

856

740

goto mandos_end;

857

741

}

858

742

859

743

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

744

buffer_capacity);

861

745

if(buffer_capacity == 0){

862

int e = errno;

863

perror_plus("incbuffer");

864

errno = e;

746

perror("incbuffer");

747

retval = -1;

865

748

goto mandos_end;

866

749

}

867

750

868

751

if(quit_now){

869

errno = EINTR;

870

752

goto mandos_end;

871

753

}

872

754

885

767

ret = gnutls_handshake(session);

886

768

887

769

if(quit_now){

888

errno = EINTR;

889

770

goto mandos_end;

890

771

}

891

772

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

892

773

if(ret < 0){

893

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

894

"***\n");

774

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

895

775

gnutls_perror(ret);

896

errno = EPROTO;

776

retval = -1;

897

777

goto mandos_end;

898

778

}

899

779

break;

900

780

default:

901

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

902

" encrypted session with Mandos server\n");

781

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

782

" encrypted session with Mandos server\n");

783

retval = -1;

903

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

905

785

goto mandos_end;

906

786

}

907

787

} else {

910

790

}

911

791

912

792

if(debug){

913

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

914

}

915

916

if(quit_now){

917

errno = EINTR;

918

goto mandos_end;

919

}

920

921

do {

922

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

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

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

}

928

805

929

806

if(buffer_length > 0){

930

807

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

932

810

&decrypted_buffer);

933

811

if(decrypted_buffer_size >= 0){

934

812

935

813

written = 0;

936

814

while(written < (size_t) decrypted_buffer_size){

937

815

if(quit_now){

938

errno = EINTR;

939

816

goto mandos_end;

940

817

}

941

818

943

820

(size_t)decrypted_buffer_size - written,

944

821

stdout);

945

822

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

946

int e = errno;

947

823

if(debug){

948

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

949

strerror(errno));

824

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

825

strerror(errno));

950

826

}

951

errno = e;

952

goto mandos_end;

827

retval = -1;

828

break;

953

829

}

954

830

written += (size_t)ret;

955

831

}

956

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

957

835

}

836

} else {

837

retval = -1;

958

838

}

959

839

960

840

/* Shutdown procedure */

961

841

962

842

mandos_end:

963

{

964

int e = errno;

965

free(decrypted_buffer);

966

free(buffer);

967

if(tcp_sd >= 0){

968

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

969

}

970

if(ret == -1){

971

if(e == 0){

972

e = errno;

973

}

974

perror_plus("close");

975

}

976

gnutls_deinit(session);

977

errno = e;

978

if(quit_now){

979

errno = EINTR;

980

retval = -1;

981

}

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;

982

853

}

983

854

return retval;

984

855

}

1009

880

switch(event){

1010

881

default:

1011

882

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

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

886

break;

1017

887

1018

888

case AVAHI_RESOLVER_FOUND:

1020

890

char ip[AVAHI_ADDRESS_STR_MAX];

1021

891

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

1022

892

if(debug){

1023

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

1024

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

1025

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

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);

1026

896

}

1027

897

int ret = start_mandos_communication(ip, port, interface,

1028

898

avahi_proto_to_af(proto));

1029

899

if(ret == 0){

1030

900

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

901

}

1035

902

}

1036

903

}

1060

927

default:

1061

928

case AVAHI_BROWSER_FAILURE:

1062

929

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

930

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

931

avahi_strerror(avahi_server_errno(mc.server)));

1065

932

avahi_simple_poll_quit(mc.simple_poll);

1066

933

return;

1067

934

1074

941

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

1075

942

name, type, domain, protocol, 0,

1076

943

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

944

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

945

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

1080

946

break;

1081

947

1082

948

case AVAHI_BROWSER_REMOVE:

1085

951

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

952

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

953

if(debug){

1088

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

1089

" searching...\n");

954

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

1090

955

}

1091

956

break;

1092

957

}

1093

958

}

1094

959

1095

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

960

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

1096

961

static void handle_sigterm(int sig){

1097

962

if(quit_now){

1098

963

return;

1100

965

quit_now = 1;

1101

966

signal_received = sig;

1102

967

int old_errno = errno;

1103

/* set main loop to exit */

1104

968

if(mc.simple_poll != NULL){

1105

969

avahi_simple_poll_quit(mc.simple_poll);

1106

970

}

1107

971

errno = old_errno;

1108

972

}

1109

973

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1121

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1123

}

1124

return false;

1125

}

1126

return true;

1127

}

1128

1129

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

1130

1131

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

if(debug){

1134

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

1135

ifname);

1136

}

1137

return false;

1138

}

1139

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

1140

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

1141

if(debug){

1142

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

1143

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

1144

}

1145

return true;

1146

}

1147

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1164

/* Accept this device */

1165

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

if(debug){

1305

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

1306

direntry->d_name);

1307

}

1308

return 1;

1309

}

1310

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1312

int ret;

1313

struct timespec now;

1314

struct timespec waited_time;

1315

intmax_t block_time;

1316

1317

while(true){

1318

if(mc.current_server == NULL){

1319

if (debug){

1320

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

1321

" No timeout!\n");

1322

}

1323

ret = avahi_simple_poll_iterate(s, -1);

1324

} else {

1325

if (debug){

1326

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

1327

" it, or wait\n");

1328

}

1329

/* the current time */

1330

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1331

if(ret == -1){

1332

perror_plus("clock_gettime");

1333

return -1;

1334

}

1335

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

1336

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

1337

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1339

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1341

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

1342

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

1343

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

1344

block_time = ((retry_interval

1345

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

1346

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

1347

1348

if (debug){

1349

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

1350

block_time);

1351

}

1352

1353

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1358

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1360

return 0;

1361

}

1362

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1364

if(ret == -1){

1365

perror_plus("clock_gettime");

1366

return -1;

1367

}

1368

mc.current_server = mc.current_server->next;

1369

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

1370

servers, but don't block */

1371

}

1372

1373

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

1374

}

1375

if(ret != 0){

1376

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

1377

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

1378

}

1379

}

1380

}

1381

}

1382

1383

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

1384

const float delay){

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1390

if(numhooks == -1){

1391

perror_plus("scandir");

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1399

perror_plus("asprintf");

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1444

free(delaystring);

1445

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

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

1484

}

1485

1486

974

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

1487

975

AvahiSServiceBrowser *sb = NULL;

1488

976

int error;

1490

978

intmax_t tmpmax;

1491

979

char *tmp;

1492

980

int exitcode = EXIT_SUCCESS;

1493

const char *interface = "";

981

const char *interface = "eth0";

1494

982

struct ifreq network;

1495

983

int sd = -1;

1496

984

bool take_down_interface = false;

1497

985

uid_t uid;

1498

986

gid_t gid;

987

char *connect_to = NULL;

1499

988

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

1500

989

bool tempdir_created = false;

1501

990

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1505

994

bool gnutls_initialized = false;

1506

995

bool gpgme_initialized = false;

1507

996

float delay = 2.5f;

1508

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

1509

retrying the same server again */

1510

997

1511

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1512

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1513

1000

1514

uid = getuid();

1515

gid = getgid();

1516

1517

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

1518

errno = 0;

1519

ret = setgid(gid);

1520

if(ret == -1){

1521

perror_plus("setgid");

1522

}

1523

1524

/* Lower user privileges (temporarily) */

1525

errno = 0;

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror_plus("seteuid");

1529

}

1530

1531

if(quit_now){

1532

goto end;

1533

}

1534

1535

1001

{

1536

1002

struct argp_option options[] = {

1537

1003

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

1566

1032

.arg = "SECONDS",

1567

1033

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

1568

1034

.group = 2 },

1569

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

1570

.arg = "SECONDS",

1571

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

1572

.group = 2 },

1573

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

1574

.arg = "DIR",

1575

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

1576

.group = 2 },

1577

/*

1578

* These reproduce what we would get without ARGP_NO_HELP

1579

*/

1580

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

1581

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

1582

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

1583

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

1584

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

1585

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

1586

1035

{ .name = NULL }

1587

1036

};

1588

1037

1589

1038

error_t parse_opt(int key, char *arg,

1590

1039

struct argp_state *state){

1591

errno = 0;

1592

1040

switch(key){

1593

1041

case 128: /* --debug */

1594

1042

debug = true;

1610

1058

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

1611

1059

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

1612

1060

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

1613

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

1061

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

1062

exit(EXIT_FAILURE);

1614

1063

}

1615

1064

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

1616

1065

break;

1621

1070

errno = 0;

1622

1071

delay = strtof(arg, &tmp);

1623

1072

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

1624

argp_error(state, "Bad delay");

1625

}

1626

case 132: /* --retry */

1627

errno = 0;

1628

retry_interval = strtod(arg, &tmp);

1629

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

1630

or (retry_interval * 1000) > INT_MAX

1631

or retry_interval < 0){

1632

argp_error(state, "Bad retry interval");

1633

}

1634

break;

1635

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

1636

hookdir = arg;

1637

break;

1638

/*

1639

* These reproduce what we would get without ARGP_NO_HELP

1640

*/

1641

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

1642

argp_state_help(state, state->out_stream,

1643

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1644

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1645

case -3: /* --usage */

1646

argp_state_help(state, state->out_stream,

1647

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

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

1652

exit(argp_err_exit_status);

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:

1653

1080

break;

1654

1081

default:

1655

1082

return ARGP_ERR_UNKNOWN;

1656

1083

}

1657

return errno;

1084

return 0;

1658

1085

}

1659

1086

1660

1087

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

1661

1088

.args_doc = "",

1662

1089

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

1663

1090

" passwords from a Mandos server" };

1664

ret = argp_parse(&argp, argc, argv,

1665

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1666

switch(ret){

1667

case 0:

1668

break;

1669

case ENOMEM:

1670

default:

1671

errno = ret;

1672

perror_plus("argp_parse");

1673

exitcode = EX_OSERR;

1674

goto end;

1675

case EINVAL:

1676

exitcode = EX_USAGE;

1677

goto end;

1678

}

1679

}

1680

1681

if(getuid() == 0){

1682

/* Work around Debian bug #633582:

1683

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

1684

struct stat st;

1685

1686

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

1740

}

1741

}

1742

1743

/* Run network hooks */

1744

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

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

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

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;

1763

1096

}

1764

1097

}

1765

1098

1767

1100

avahi_set_log_function(empty_log);

1768

1101

}

1769

1102

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

1802

1103

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

1803

1104

from the signal handler */

1804

1105

/* Initialize the pseudo-RNG for Avahi */

1805

1106

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

1806

1107

mc.simple_poll = avahi_simple_poll_new();

1807

1108

if(mc.simple_poll == NULL){

1808

fprintf_plus(stderr,

1809

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

1810

exitcode = EX_UNAVAILABLE;

1109

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

1110

exitcode = EXIT_FAILURE;

1811

1111

goto end;

1812

1112

}

1813

1113

1814

1114

sigemptyset(&sigterm_action.sa_mask);

1815

1115

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

1816

1116

if(ret == -1){

1817

perror_plus("sigaddset");

1818

exitcode = EX_OSERR;

1117

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1819

1119

goto end;

1820

1120

}

1821

1121

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

1822

1122

if(ret == -1){

1823

perror_plus("sigaddset");

1824

exitcode = EX_OSERR;

1123

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1825

1125

goto end;

1826

1126

}

1827

1127

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

1828

1128

if(ret == -1){

1829

perror_plus("sigaddset");

1830

exitcode = EX_OSERR;

1129

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

1831

1131

goto end;

1832

1132

}

1833

1133

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

1836

1136

*/

1837

1137

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

1838

1138

if(ret == -1){

1839

perror_plus("sigaction");

1840

return EX_OSERR;

1139

perror("sigaction");

1140

return EXIT_FAILURE;

1841

1141

}

1842

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1843

1143

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

1844

1144

if(ret == -1){

1845

perror_plus("sigaction");

1846

exitcode = EX_OSERR;

1145

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

1847

1147

goto end;

1848

1148

}

1849

1149

}

1850

1150

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

1851

1151

if(ret == -1){

1852

perror_plus("sigaction");

1853

return EX_OSERR;

1152

perror("sigaction");

1153

return EXIT_FAILURE;

1854

1154

}

1855

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1856

1156

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

1857

1157

if(ret == -1){

1858

perror_plus("sigaction");

1859

exitcode = EX_OSERR;

1158

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

1860

1160

goto end;

1861

1161

}

1862

1162

}

1863

1163

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

1864

1164

if(ret == -1){

1865

perror_plus("sigaction");

1866

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1867

1167

}

1868

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1869

1169

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

1870

1170

if(ret == -1){

1871

perror_plus("sigaction");

1872

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1873

1173

goto end;

1874

1174

}

1875

1175

}

1876

1176

1877

1177

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

1878

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

1178

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

1879

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

1180

if(if_index == 0){

1881

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

1882

exitcode = EX_UNAVAILABLE;

1181

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

1182

exitcode = EXIT_FAILURE;

1883

1183

goto end;

1884

1184

}

1885

1185

1887

1187

goto end;

1888

1188

}

1889

1189

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1897

1190

#ifdef __linux__

1898

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1899

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

1192

messages to mess up the prompt */

1900

1193

ret = klogctl(8, NULL, 5);

1901

1194

bool restore_loglevel = true;

1902

1195

if(ret == -1){

1903

1196

restore_loglevel = false;

1904

perror_plus("klogctl");

1197

perror("klogctl");

1905

1198

}

1906

1199

#endif /* __linux__ */

1907

1200

1908

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

1202

if(sd < 0){

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1203

perror("socket");

1204

exitcode = EXIT_FAILURE;

1912

1205

#ifdef __linux__

1913

1206

if(restore_loglevel){

1914

1207

ret = klogctl(7, NULL, 0);

1915

1208

if(ret == -1){

1916

perror_plus("klogctl");

1209

perror("klogctl");

1917

1210

}

1918

1211

}

1919

1212

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1926

1213

goto end;

1927

1214

}

1928

1215

strcpy(network.ifr_name, interface);

1929

1216

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

1930

1217

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1218

perror("ioctl SIOCGIFFLAGS");

1932

1219

#ifdef __linux__

1933

1220

if(restore_loglevel){

1934

1221

ret = klogctl(7, NULL, 0);

1935

1222

if(ret == -1){

1936

perror_plus("klogctl");

1223

perror("klogctl");

1937

1224

}

1938

1225

}

1939

1226

#endif /* __linux__ */

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1227

exitcode = EXIT_FAILURE;

1947

1228

goto end;

1948

1229

}

1949

1230

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

1952

1233

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

1953

1234

if(ret == -1){

1954

1235

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1957

1238

#ifdef __linux__

1958

1239

if(restore_loglevel){

1959

1240

ret = klogctl(7, NULL, 0);

1960

1241

if(ret == -1){

1961

perror_plus("klogctl");

1242

perror("klogctl");

1962

1243

}

1963

1244

}

1964

1245

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

1246

goto end;

1972

1247

}

1973

1248

}

1974

/* Sleep checking until interface is running.

1975

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

1249

/* sleep checking until interface is running */

1976

1250

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

1977

1251

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

1978

1252

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1253

perror("ioctl SIOCGIFFLAGS");

1980

1254

} else if(network.ifr_flags & IFF_RUNNING){

1981

1255

break;

1982

1256

}

1983

1257

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

1258

ret = nanosleep(&sleeptime, NULL);

1985

1259

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

1986

perror_plus("nanosleep");

1260

perror("nanosleep");

1987

1261

}

1988

1262

}

1989

1263

if(not take_down_interface){

1990

1264

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

1991

1265

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

1992

1266

if(ret == -1){

1993

perror_plus("close");

1267

perror("close");

1994

1268

}

1995

1269

}

1996

1270

#ifdef __linux__

1998

1272

/* Restores kernel loglevel to default */

1999

1273

ret = klogctl(7, NULL, 0);

2000

1274

if(ret == -1){

2001

perror_plus("klogctl");

1275

perror("klogctl");

2002

1276

}

2003

1277

}

2004

1278

#endif /* __linux__ */

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

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

1289

errno = 0;

1290

ret = setgid(gid);

1291

if(ret == -1){

1292

perror("setgid");

1293

}

1294

1295

/* Drop user privileges */

1296

errno = 0;

1297

/* Will we need privileges later? */

1298

if(take_down_interface){

1299

/* Drop user privileges temporarily */

2008

1300

ret = seteuid(uid);

2009

1301

if(ret == -1){

2010

perror_plus("seteuid");

1302

perror("seteuid");

1303

}

1304

} else {

1305

/* Drop user privileges permanently */

1306

ret = setuid(uid);

1307

if(ret == -1){

1308

perror("setuid");

2011

1309

}

2012

1310

}

2013

1311

2017

1315

2018

1316

ret = init_gnutls_global(pubkey, seckey);

2019

1317

if(ret == -1){

2020

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

2021

exitcode = EX_UNAVAILABLE;

1318

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

1319

exitcode = EXIT_FAILURE;

2022

1320

goto end;

2023

1321

} else {

2024

1322

gnutls_initialized = true;

2028

1326

goto end;

2029

1327

}

2030

1328

1329

tempdir_created = true;

2031

1330

if(mkdtemp(tempdir) == NULL){

2032

perror_plus("mkdtemp");

1331

tempdir_created = false;

1332

perror("mkdtemp");

2033

1333

goto end;

2034

1334

}

2035

tempdir_created = true;

2036

1335

2037

1336

if(quit_now){

2038

1337

goto end;

2039

1338

}

2040

1339

2041

1340

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

2042

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

2043

exitcode = EX_UNAVAILABLE;

1341

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

1342

exitcode = EXIT_FAILURE;

2044

1343

goto end;

2045

1344

} else {

2046

1345

gpgme_initialized = true;

2055

1354

/* (Mainly meant for debugging) */

2056

1355

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

2057

1356

if(address == NULL){

2058

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

2059

exitcode = EX_USAGE;

1357

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

1358

exitcode = EXIT_FAILURE;

2060

1359

goto end;

2061

1360

}

2062

1361

2069

1368

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

2070

1369

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

2071

1370

or tmpmax != (uint16_t)tmpmax){

2072

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

2073

exitcode = EX_USAGE;

1371

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

1372

exitcode = EXIT_FAILURE;

2074

1373

goto end;

2075

1374

}

2076

1375

2080

1379

2081

1380

port = (uint16_t)tmpmax;

2082

1381

*address = '\0';

1382

address = connect_to;

2083

1383

/* Colon in address indicates IPv6 */

2084

1384

int af;

2085

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

1385

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

2086

1386

af = AF_INET6;

2087

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

2088

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

2089

{

2090

connect_to++;

2091

address[-1] = '\0';

2092

}

2093

1387

} else {

2094

1388

af = AF_INET;

2095

1389

}

2096

address = connect_to;

2097

1390

2098

1391

if(quit_now){

2099

1392

goto end;

2100

1393

}

2101

1394

2102

while(not quit_now){

2103

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

2104

if(quit_now or ret == 0){

2105

break;

2106

}

2107

if(debug){

2108

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

2109

(int)retry_interval);

2110

}

2111

sleep((int)retry_interval);

2112

}

2113

2114

if (not quit_now){

1395

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

1396

if(ret < 0){

1397

exitcode = EXIT_FAILURE;

1398

} else {

2115

1399

exitcode = EXIT_SUCCESS;

2116

1400

}

2117

2118

1401

goto end;

2119

1402

}

2120

1403

2142

1425

2143

1426

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

2144

1427

if(mc.server == NULL){

2145

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

2146

avahi_strerror(error));

2147

exitcode = EX_UNAVAILABLE;

1428

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

1429

avahi_strerror(error));

1430

exitcode = EXIT_FAILURE;

2148

1431

goto end;

2149

1432

}

2150

1433

2157

1440

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

1441

NULL, 0, browse_callback, NULL);

2159

1442

if(sb == NULL){

2160

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

2161

avahi_strerror(avahi_server_errno(mc.server)));

2162

exitcode = EX_UNAVAILABLE;

1443

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

1444

avahi_strerror(avahi_server_errno(mc.server)));

1445

exitcode = EXIT_FAILURE;

2163

1446

goto end;

2164

1447

}

2165

1448

2170

1453

/* Run the main loop */

2171

1454

2172

1455

if(debug){

2173

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

2174

}

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2178

if(debug){

2179

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

2180

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

2181

}

1456

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

1457

}

1458

1459

avahi_simple_poll_loop(mc.simple_poll);

2182

1460

2183

1461

end:

2184

1462

2185

1463

if(debug){

2186

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

1464

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

2187

1465

}

2188

1466

2189

1467

/* Cleanup things */

2206

1484

gpgme_release(mc.ctx);

2207

1485

}

2208

1486

2209

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

2210

has seen */

2211

if(mc.current_server != NULL){

2212

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

2213

while(mc.current_server != NULL){

2214

server *next = mc.current_server->next;

2215

free(mc.current_server);

2216

mc.current_server = next;

2217

}

2218

}

2219

2220

/* Re-raise priviliges */

2221

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

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

1487

/* Take down the network interface */

1488

if(take_down_interface){

1489

/* Re-raise priviliges */

1490

errno = 0;

1491

ret = seteuid(0);

1492

if(ret == -1){

1493

perror("seteuid");

1494

}

1495

if(geteuid() == 0){

2235

1496

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

2236

1497

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_UP) {

1500

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

2240

1501

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

2241

1502

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1503

perror("ioctl SIOCSIFFLAGS");

2243

1504

}

2244

1505

}

2245

1506

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

2246

1507

if(ret == -1){

2247

perror_plus("close");

2248

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

1508

perror("close");

1509

}

1510

/* Lower privileges, permanently this time */

1511

errno = 0;

1512

ret = setuid(uid);

1513

if(ret == -1){

1514

perror("setuid");

1515

}

2257

1516

}

2258

1517

}

2259

1518

2260

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

1519

/* Removes the temp directory used by GPGME */

2261

1520

if(tempdir_created){

2262

struct dirent **direntries = NULL;

2263

struct dirent *direntry = NULL;

2264

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

2265

alphasort);

2266

if (numentries > 0){

2267

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

2268

direntry = direntries[i];

1521

DIR *d;

1522

struct dirent *direntry;

1523

d = opendir(tempdir);

1524

if(d == NULL){

1525

if(errno != ENOENT){

1526

perror("opendir");

1527

}

1528

} else {

1529

while(true){

1530

direntry = readdir(d);

1531

if(direntry == NULL){

1532

break;

1533

}

1534

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

1535

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

1536

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

1537

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

1538

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

1539

continue;

1540

}

2269

1541

char *fullname = NULL;

2270

1542

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

2271

1543

direntry->d_name);

2272

1544

if(ret < 0){

2273

perror_plus("asprintf");

1545

perror("asprintf");

2274

1546

continue;

2275

1547

}

2276

1548

ret = remove(fullname);

2277

1549

if(ret == -1){

2278

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

2279

strerror(errno));

1550

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

1551

strerror(errno));

2280

1552

}

2281

1553

free(fullname);

2282

1554

}

2283

}

2284

2285

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

2286

free(direntries);

2287

if (numentries == -1){

2288

perror_plus("scandir");

1555

closedir(d);

2289

1556

}

2290

1557

ret = rmdir(tempdir);

2291

1558

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

2292

perror_plus("rmdir");

1559

perror("rmdir");

2293

1560

}

2294

1561

}

2295

1562

2296

1563

if(quit_now){

2297

1564

sigemptyset(&old_sigterm_action.sa_mask);

2298

1565

old_sigterm_action.sa_handler = SIG_DFL;

2299

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2300

&old_sigterm_action,

2301

NULL));

1566

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

2302

1567

if(ret == -1){

2303

perror_plus("sigaction");

2304

}

2305

do {

2306

ret = raise(signal_received);

2307

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

2308

if(ret != 0){

2309

perror_plus("raise");

2310

abort();

2311

}

2312

TEMP_FAILURE_RETRY(pause());

1568

perror("sigaction");

1569

}

1570

raise(signal_received);

2313

1571

}

2314

1572

2315

1573

return exitcode;