/mandos/release : revision 237.7.236

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() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

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() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

60

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

72

73

*/

73

74

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

74

75

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

75

setgid(), pause() */

76

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

76

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

77

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

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,

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

#include <argz.h> /* argz_add_sep(), argz_next(),

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

96

EAI_SYSTEM, gai_strerror() */

87

97

88

98

#ifdef __linux__

89

99

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

107

117

init_gnutls_session(),

108

118

GNUTLS_* */

109

119

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

120

/* gnutls_certificate_set_openpgp_key_file(),

121

GNUTLS_OPENPGP_FMT_BASE64 */

112

122

113

123

/* GPGME */

114

124

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

122

132

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

123

133

#define SECKEY "seckey.txt"

124

134

#define PUBKEY "pubkey.txt"

135

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

125

136

126

137

bool debug = false;

127

138

static const char mandos_protocol_version[] = "1";

128

139

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

129

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

140

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

130

141

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

131

142

char *connect_to = NULL;

143

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

146

147

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

148

typedef struct server{

149

const char *ip;

150

in_port_t port;

151

AvahiIfIndex if_index;

152

int af;

153

struct timespec last_seen;

154

struct server *next;

155

struct server *prev;

156

} server;

132

157

133

158

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

134

159

typedef struct {

135

AvahiSimplePoll *simple_poll;

136

160

AvahiServer *server;

137

161

gnutls_certificate_credentials_t cred;

138

162

unsigned int dh_bits;

139

163

gnutls_dh_params_t dh_params;

140

164

const char *priority;

141

165

gpgme_ctx_t ctx;

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

142

169

} mandos_context;

143

170

144

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

145

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

146

.dh_bits = 1024, .priority = "SECURE256"

147

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

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

148

173

149

174

sig_atomic_t quit_now = 0;

150

175

int signal_received = 0;

151

176

177

/* Function to use when printing errors */

178

void perror_plus(const char *print_text){

179

int e = errno;

180

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

181

program_invocation_short_name);

182

errno = e;

183

perror(print_text);

184

}

185

186

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

187

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

188

va_list ap;

189

va_start (ap, format);

190

191

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

192

program_invocation_short_name));

193

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

194

}

195

152

196

/*

153

197

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

154

198

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

155

199

* "buffer_length" is how much is already used.

156

200

*/

201

__attribute__((nonnull, warn_unused_result))

157

202

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

203

size_t buffer_capacity){

159

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

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

161

if(buffer == NULL){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

162

211

return 0;

163

212

}

213

*buffer = new_buf;

164

214

buffer_capacity += BUFFER_SIZE;

165

215

}

166

216

return buffer_capacity;

167

217

}

168

218

219

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

220

__attribute__((nonnull, warn_unused_result))

221

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

222

int af, server **current_server){

223

int ret;

224

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

225

if(new_server == NULL){

226

perror_plus("malloc");

227

return false;

228

}

229

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

230

.port = port,

231

.if_index = if_index,

232

.af = af };

233

if(new_server->ip == NULL){

234

perror_plus("strdup");

235

return false;

236

}

237

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

/* Special case of first server */

243

if(*current_server == NULL){

244

new_server->next = new_server;

245

new_server->prev = new_server;

246

*current_server = new_server;

247

} else {

248

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

249

new_server->next = *current_server;

250

new_server->prev = (*current_server)->prev;

251

new_server->prev->next = new_server;

252

(*current_server)->prev = new_server;

253

}

254

return true;

255

}

256

169

257

/*

170

258

* Initialize GPGME.

171

259

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

174

265

gpgme_error_t rc;

175

266

gpgme_engine_info_t engine_info;

176

267

177

178

268

/*

179

269

* Helper function to insert pub and seckey to the engine keyring.

180

270

*/

181

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

182

272

int ret;

183

273

int fd;

184

274

gpgme_data_t pgp_data;

185

275

186

276

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

187

277

if(fd == -1){

188

perror("open");

278

perror_plus("open");

189

279

return false;

190

280

}

191

281

192

282

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

283

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

196

286

return false;

197

287

}

198

288

199

rc = gpgme_op_import(mc.ctx, pgp_data);

289

rc = gpgme_op_import(mc->ctx, pgp_data);

200

290

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

203

293

return false;

204

294

}

205

295

206

296

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

207

297

if(ret == -1){

208

perror("close");

298

perror_plus("close");

209

299

}

210

300

gpgme_data_release(pgp_data);

211

301

return true;

212

302

}

213

303

214

304

if(debug){

215

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

305

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

216

306

}

217

307

218

308

/* Init GPGME */

219

309

gpgme_check_version(NULL);

220

310

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

311

if(rc != GPG_ERR_NO_ERROR){

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

312

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

313

gpgme_strsource(rc), gpgme_strerror(rc));

224

314

return false;

225

315

}

226

316

227

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

317

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

228

318

rc = gpgme_get_engine_info(&engine_info);

229

319

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

320

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

321

gpgme_strsource(rc), gpgme_strerror(rc));

232

322

return false;

233

323

}

234

324

while(engine_info != NULL){

240

330

engine_info = engine_info->next;

241

331

}

242

332

if(engine_info == NULL){

243

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

333

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

334

tempdir);

244

335

return false;

245

336

}

246

337

247

338

/* Create new GPGME "context" */

248

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

339

rc = gpgme_new(&(mc->ctx));

249

340

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

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

343

gpgme_strerror(rc));

252

344

return false;

253

345

}

254

346

263

355

* Decrypt OpenPGP data.

264

356

* Returns -1 on error

265

357

*/

358

__attribute__((nonnull, warn_unused_result))

266

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

267

360

size_t crypto_size,

268

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

269

363

gpgme_data_t dh_crypto, dh_plain;

270

364

gpgme_error_t rc;

271

365

ssize_t ret;

273

367

ssize_t plaintext_length = 0;

274

368

275

369

if(debug){

276

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

370

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

277

371

}

278

372

279

373

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

280

374

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

375

0);

282

376

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

377

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

378

gpgme_strsource(rc), gpgme_strerror(rc));

285

379

return -1;

286

380

}

287

381

288

382

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

289

383

rc = gpgme_data_new(&dh_plain);

290

384

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

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

387

gpgme_strsource(rc), gpgme_strerror(rc));

293

388

gpgme_data_release(dh_crypto);

294

389

return -1;

295

390

}

296

391

297

392

/* Decrypt data from the cryptotext data buffer to the plaintext

298

393

data buffer */

299

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

394

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

300

395

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

396

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

397

gpgme_strsource(rc), gpgme_strerror(rc));

303

398

plaintext_length = -1;

304

399

if(debug){

305

400

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

307

402

if(result == NULL){

308

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

403

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

309

404

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

405

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

406

result->unsupported_algorithm);

407

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

408

result->wrong_key_usage);

314

409

if(result->file_name != NULL){

315

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

410

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

316

411

}

317

412

gpgme_recipient_t recipient;

318

413

recipient = result->recipients;

319

414

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

415

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

416

gpgme_pubkey_algo_name

417

(recipient->pubkey_algo));

418

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

419

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

420

recipient->status == GPG_ERR_NO_SECKEY

421

? "No" : "Yes");

326

422

recipient = recipient->next;

327

423

}

328

424

}

331

427

}

332

428

333

429

if(debug){

334

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

430

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

335

431

}

336

432

337

433

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

338

434

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

339

perror("gpgme_data_seek");

435

perror_plus("gpgme_data_seek");

340

436

plaintext_length = -1;

341

437

goto decrypt_end;

342

438

}

344

440

*plaintext = NULL;

345

441

while(true){

346

442

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

443

(size_t)plaintext_length,

444

plaintext_capacity);

349

445

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

446

perror_plus("incbuffer");

447

plaintext_length = -1;

448

goto decrypt_end;

353

449

}

354

450

355

451

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

456

break;

361

457

}

362

458

if(ret < 0){

363

perror("gpgme_data_read");

459

perror_plus("gpgme_data_read");

364

460

plaintext_length = -1;

365

461

goto decrypt_end;

366

462

}

368

464

}

369

465

370

466

if(debug){

371

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

467

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

372

468

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

373

469

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

374

470

}

385

481

return plaintext_length;

386

482

}

387

483

388

static const char * safer_gnutls_strerror(int value){

389

const char *ret = gnutls_strerror(value); /* Spurious warning from

390

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

391

487

if(ret == NULL)

392

488

ret = "(unknown)";

393

489

return ret;

394

490

}

395

491

396

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

397

494

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

398

495

const char* string){

399

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

496

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

400

497

}

401

498

499

__attribute__((nonnull, warn_unused_result))

402

500

static int init_gnutls_global(const char *pubkeyfilename,

403

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

404

503

int ret;

405

504

406

505

if(debug){

407

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

506

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

408

507

}

409

508

410

509

ret = gnutls_global_init();

411

510

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

511

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

512

safer_gnutls_strerror(ret));

414

513

return -1;

415

514

}

416

515

423

522

}

424

523

425

524

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

427

526

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

527

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

528

safer_gnutls_strerror(ret));

433

529

gnutls_global_deinit();

434

530

return -1;

435

531

}

436

532

437

533

if(debug){

438

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

439

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

440

seckeyfilename);

534

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

535

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

536

pubkeyfilename,

537

seckeyfilename);

441

538

}

442

539

443

540

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

445

542

GNUTLS_OPENPGP_FMT_BASE64);

446

543

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

544

fprintf_plus(stderr,

545

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

546

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

547

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

548

safer_gnutls_strerror(ret));

452

549

goto globalfail;

453

550

}

454

551

455

552

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

457

554

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

" initialization: %s\n",

557

safer_gnutls_strerror(ret));

460

558

goto globalfail;

461

559

}

462

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

560

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

463

561

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

562

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

563

safer_gnutls_strerror(ret));

466

564

goto globalfail;

467

565

}

468

566

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

470

568

471

569

return 0;

472

570

473

571

globalfail:

474

572

475

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

476

574

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

478

576

return -1;

479

577

}

480

578

481

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

482

582

int ret;

483

583

/* GnuTLS session creation */

484

584

do {

488

588

}

489

589

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

490

590

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

591

fprintf_plus(stderr,

592

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

593

safer_gnutls_strerror(ret));

493

594

}

494

595

495

596

{

496

597

const char *err;

497

598

do {

498

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

599

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

499

600

if(quit_now){

500

601

gnutls_deinit(*session);

501

602

return -1;

502

603

}

503

604

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

504

605

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

606

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

607

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

608

safer_gnutls_strerror(ret));

508

609

gnutls_deinit(*session);

509

610

return -1;

510

611

}

512

613

513

614

do {

514

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

616

mc->cred);

516

617

if(quit_now){

517

618

gnutls_deinit(*session);

518

619

return -1;

519

620

}

520

621

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

521

622

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

623

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

624

safer_gnutls_strerror(ret));

524

625

gnutls_deinit(*session);

525

626

return -1;

526

627

}

528

629

/* ignore client certificate if any. */

529

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

530

631

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

532

633

533

634

return 0;

534

635

}

538

639

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

539

640

540

641

/* Called when a Mandos server is found */

541

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

642

__attribute__((nonnull, warn_unused_result))

643

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

542

644

AvahiIfIndex if_index,

543

int af){

645

int af, mandos_context *mc){

544

646

int ret, tcp_sd = -1;

545

647

ssize_t sret;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

648

struct sockaddr_storage to;

550

649

char *buffer = NULL;

551

650

char *decrypted_buffer = NULL;

552

651

size_t buffer_length = 0;

571

670

pf = PF_INET;

572

671

break;

573

672

default:

574

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

673

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

575

674

errno = EINVAL;

576

675

return -1;

577

676

}

578

677

579

ret = init_gnutls_session(&session);

678

/* If the interface is specified and we have a list of interfaces */

679

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

680

/* Check if the interface is one of the interfaces we are using */

681

bool match = false;

682

{

683

char *interface = NULL;

684

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

685

interface))){

686

if(if_nametoindex(interface) == (unsigned int)if_index){

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

/* This interface does not match any in the list, so we don't

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

fprintf_plus(stderr, "Skipping server on non-used interface"

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

580

711

if(ret != 0){

581

712

return -1;

582

713

}

583

714

584

715

if(debug){

585

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

586

"\n", ip, port);

716

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

717

PRIuMAX "\n", ip, (uintmax_t)port);

587

718

}

588

719

589

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

721

if(tcp_sd < 0){

591

722

int e = errno;

592

perror("socket");

723

perror_plus("socket");

593

724

errno = e;

594

725

goto mandos_end;

595

726

}

601

732

602

733

memset(&to, 0, sizeof(to));

603

734

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

ret = inet_pton(af, ip, &to.in6.sin6_addr);

735

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

736

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

606

737

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

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

738

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

739

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

609

740

}

610

741

if(ret < 0 ){

611

742

int e = errno;

612

perror("inet_pton");

743

perror_plus("inet_pton");

613

744

errno = e;

614

745

goto mandos_end;

615

746

}

616

747

if(ret == 0){

617

748

int e = errno;

618

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

749

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

619

750

errno = e;

620

751

goto mandos_end;

621

752

}

622

753

if(af == AF_INET6){

623

to.in6.sin6_port = htons(port); /* Spurious warnings from

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

754

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

755

if(IN6_IS_ADDR_LINKLOCAL

756

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

630

757

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

758

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

759

" incomplete without a network interface\n");

633

760

errno = EINVAL;

634

761

goto mandos_end;

635

762

}

636

763

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

764

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

638

765

}

639

766

} else {

640

to.in.sin_port = htons(port); /* Spurious warnings from

641

-Wconversion and

642

-Wunreachable-code */

767

((struct sockaddr_in *)&to)->sin_port = htons(port);

643

768

}

644

769

645

770

if(quit_now){

651

776

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

652

777

char interface[IF_NAMESIZE];

653

778

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

654

perror("if_indextoname");

779

perror_plus("if_indextoname");

655

780

} else {

656

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

657

ip, interface, port);

781

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

782

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

658

783

}

659

784

} else {

660

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

661

port);

785

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

786

ip, (uintmax_t)port);

662

787

}

663

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

790

if(af == AF_INET6){

667

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

668

sizeof(addrstr));

791

ret = getnameinfo((struct sockaddr *)&to,

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

669

795

} else {

670

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

671

sizeof(addrstr));

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

672

800

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

805

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

806

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

679

807

}

680

808

}

681

809

685

813

}

686

814

687

815

if(af == AF_INET6){

688

ret = connect(tcp_sd, &to.in6, sizeof(to));

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

689

818

} else {

690

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

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

691

821

}

692

822

if(ret < 0){

693

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

823

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

694

824

int e = errno;

695

perror("connect");

825

perror_plus("connect");

696

826

errno = e;

697

827

}

698

828

goto mandos_end;

708

838

while(true){

709

839

size_t out_size = strlen(out);

710

840

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

711

out_size - written));

841

out_size - written));

712

842

if(ret == -1){

713

843

int e = errno;

714

perror("write");

844

perror_plus("write");

715

845

errno = e;

716

846

goto mandos_end;

717

847

}

734

864

}

735

865

736

866

if(debug){

737

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

867

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

738

868

}

739

869

740

870

if(quit_now){

742

872

goto mandos_end;

743

873

}

744

874

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

/* This casting via intptr_t is to eliminate warning about casting

876

an int to a pointer type. This is exactly how the GnuTLS Guile

877

function "set-session-transport-fd!" does it. */

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

880

747

881

if(quit_now){

748

882

errno = EINTR;

759

893

760

894

if(ret != GNUTLS_E_SUCCESS){

761

895

if(debug){

762

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

896

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

763

897

gnutls_perror(ret);

764

898

}

765

899

errno = EPROTO;

769

903

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

770

904

771

905

if(debug){

772

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

773

ip);

906

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

907

" %s\n", ip);

774

908

}

775

909

776

910

while(true){

781

915

}

782

916

783

917

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

918

buffer_capacity);

785

919

if(buffer_capacity == 0){

786

920

int e = errno;

787

perror("incbuffer");

921

perror_plus("incbuffer");

788

922

errno = e;

789

923

goto mandos_end;

790

924

}

814

948

}

815

949

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

816

950

if(ret < 0){

817

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

951

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

952

"***\n");

818

953

gnutls_perror(ret);

819

954

errno = EPROTO;

820

955

goto mandos_end;

821

956

}

822

957

break;

823

958

default:

824

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

825

" encrypted session with Mandos server\n");

959

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

960

" encrypted session with Mandos server\n");

826

961

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

962

errno = EIO;

828

963

goto mandos_end;

833

968

}

834

969

835

970

if(debug){

836

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

971

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

837

972

}

838

973

839

974

if(quit_now){

851

986

852

987

if(buffer_length > 0){

853

988

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

857

991

if(decrypted_buffer_size >= 0){

858

992

859

993

written = 0;

869

1003

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

870

1004

int e = errno;

871

1005

if(debug){

872

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

873

strerror(errno));

1006

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

1007

strerror(errno));

874

1008

}

875

1009

errno = e;

876

1010

goto mandos_end;

895

1029

if(e == 0){

896

1030

e = errno;

897

1031

}

898

perror("close");

1032

perror_plus("close");

899

1033

}

900

1034

gnutls_deinit(session);

1035

errno = e;

901

1036

if(quit_now){

902

e = EINTR;

1037

errno = EINTR;

903

1038

retval = -1;

904

1039

}

905

errno = e;

906

1040

}

907

1041

return retval;

908

1042

}

909

1043

1044

__attribute__((nonnull))

910

1045

static void resolve_callback(AvahiSServiceResolver *r,

911

1046

AvahiIfIndex interface,

912

1047

AvahiProtocol proto,

920

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

1057

flags,

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

925

1062

926

1063

/* Called whenever a service has been resolved successfully or

927

1064

timed out */

933

1070

switch(event){

934

1071

default:

935

1072

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

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

1075

domain,

1076

avahi_strerror(avahi_server_errno

1077

(((mandos_context*)mc)->server)));

939

1078

break;

940

1079

941

1080

case AVAHI_RESOLVER_FOUND:

943

1082

char ip[AVAHI_ADDRESS_STR_MAX];

944

1083

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

945

1084

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1085

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

1086

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

1087

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

949

1088

}

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1089

int ret = start_mandos_communication(ip, (in_port_t)port,

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

952

1093

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1095

} else {

1096

if(not add_server(ip, (in_port_t)port, interface,

1097

avahi_proto_to_af(proto),

1098

&((mandos_context*)mc)->current_server)){

1099

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

1100

" list\n", name);

1101

}

954

1102

}

955

1103

}

956

1104

}

966

1114

const char *domain,

967

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

1116

flags,

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

971

1121

972

1122

/* Called whenever a new services becomes available on the LAN or

973

1123

is removed from the LAN */

980

1130

default:

981

1131

case AVAHI_BROWSER_FAILURE:

982

1132

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1133

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

1134

avahi_strerror(avahi_server_errno

1135

(((mandos_context*)mc)->server)));

1136

avahi_simple_poll_quit(simple_poll);

986

1137

return;

987

1138

988

1139

case AVAHI_BROWSER_NEW:

991

1142

the callback function is called the Avahi server will free the

992

1143

resolver for us. */

993

1144

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

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

998

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

1145

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1149

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

1150

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

(((mandos_context*)mc)->server)));

999

1153

break;

1000

1154

1001

1155

case AVAHI_BROWSER_REMOVE:

1004

1158

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1159

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1160

if(debug){

1007

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

1161

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

1162

" searching...\n");

1008

1163

}

1009

1164

break;

1010

1165

}

1011

1166

}

1012

1167

1013

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

1168

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

1014

1169

static void handle_sigterm(int sig){

1015

1170

if(quit_now){

1016

1171

return;

1018

1173

quit_now = 1;

1019

1174

signal_received = sig;

1020

1175

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1176

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1023

1179

}

1024

1180

errno = old_errno;

1025

1181

}

1026

1182

1183

__attribute__((nonnull, warn_unused_result))

1184

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

1185

int ret;

1186

error_t ret_errno;

1187

1188

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

1189

if(s < 0){

1190

ret_errno = errno;

1191

perror_plus("socket");

1192

errno = ret_errno;

1193

return false;

1194

}

1195

strcpy(ifr->ifr_name, ifname);

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1197

if(ret == -1){

1198

if(debug){

1199

ret_errno = errno;

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1202

}

1203

return false;

1204

}

1205

return true;

1206

}

1207

1208

__attribute__((nonnull, warn_unused_result))

1209

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

1210

1211

/* Reject the loopback device */

1212

if(ifr->ifr_flags & IFF_LOOPBACK){

1213

if(debug){

1214

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

1215

ifname);

1216

}

1217

return false;

1218

}

1219

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

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return true;

1226

}

1227

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

1228

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

1229

if(debug){

1230

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1231

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

1232

}

1233

return false;

1234

}

1235

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

1236

if(ifr->ifr_flags & IFF_NOARP){

1237

if(debug){

1238

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

1239

ifname);

1240

}

1241

return false;

1242

}

1243

1244

/* Accept this device */

1245

if(debug){

1246

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

1247

}

1248

return true;

1249

}

1250

1027

1251

/*

1028

1252

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

1029

1253

* corresponds to an acceptable network device.

1030

1254

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

1031

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1032

1257

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

1258

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

1042

1259

return 0;

1043

1260

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1261

1262

struct ifreq ifr;

1263

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

1264

if(debug){

1265

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

1266

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

1267

}

1268

return 0;

1269

}

1270

1271

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

1272

return 0;

1273

}

1274

return 1;

1275

}

1276

1277

/*

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

if(not get_flags(interface, &ifr)){

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

return (bool)(ifr.ifr_flags & IFF_UP);

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

if(not get_flags(interface, &ifr)){

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

int notdotentries(const struct dirent *direntry){

1313

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

1314

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

1315

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

1316

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

1317

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

1318

return 0;

1319

}

1320

return 1;

1321

}

1322

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1325

int runnable_hook(const struct dirent *direntry){

1326

int ret;

1327

size_t sret;

1328

struct stat st;

1329

1330

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

1331

/* Empty name? */

1332

return 0;

1333

}

1334

1335

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

1336

"abcdefghijklmnopqrstuvwxyz"

1337

"0123456789"

1338

"_.-");

1339

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

1340

/* Contains non-allowed characters */

1341

if(debug){

1342

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

1343

direntry->d_name);

1344

}

1345

return 0;

1346

}

1347

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1356

if(ret == -1){

1357

if(debug){

1358

perror_plus("Could not stat hook");

1359

}

1360

return 0;

1361

}

1362

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

1363

/* Not a regular file */

1364

if(debug){

1365

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

1366

direntry->d_name);

1367

}

1368

return 0;

1369

}

1370

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

1371

/* Not executable */

1372

if(debug){

1373

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

1374

direntry->d_name);

1375

}

1376

return 0;

1377

}

1378

if(debug){

1379

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

1380

direntry->d_name);

1381

}

1382

return 1;

1383

}

1384

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1388

int ret;

1389

struct timespec now;

1390

struct timespec waited_time;

1391

intmax_t block_time;

1392

1393

while(true){

1394

if(mc->current_server == NULL){

1395

if(debug){

1396

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

1397

" No timeout!\n");

1398

}

1399

ret = avahi_simple_poll_iterate(s, -1);

1400

} else {

1401

if(debug){

1402

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

1403

" it, or wait\n");

1404

}

1405

/* the current time */

1406

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1407

if(ret == -1){

1408

perror_plus("clock_gettime");

1409

return -1;

1410

}

1411

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

1412

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

1413

waited_time.tv_sec = (now.tv_sec

1414

- mc->current_server->last_seen.tv_sec);

1415

waited_time.tv_nsec = (now.tv_nsec

1416

- mc->current_server->last_seen.tv_nsec);

1417

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

1418

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

1419

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

1420

block_time = ((retry_interval

1421

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

1422

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

1423

1424

if(debug){

1425

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

1426

block_time);

1427

}

1428

1429

if(block_time <= 0){

1430

ret = start_mandos_communication(mc->current_server->ip,

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1434

if(ret == 0){

1435

avahi_simple_poll_quit(s);

1436

return 0;

1437

}

1438

ret = clock_gettime(CLOCK_MONOTONIC,

1439

&mc->current_server->last_seen);

1440

if(ret == -1){

1441

perror_plus("clock_gettime");

1442

return -1;

1443

}

1444

mc->current_server = mc->current_server->next;

1445

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

1446

servers, but don't block */

1447

}

1448

1449

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

1450

}

1451

if(ret != 0){

1452

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

1453

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

1454

}

1455

}

1456

}

1457

}

1458

1459

/* Set effective uid to 0, return errno */

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

if(seteuid(0) == -1){

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Set effective and real user ID to 0. Return errno. */

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

if(setuid(0) == -1){

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

/* Set effective user ID to unprivileged saved user ID */

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

if(seteuid(uid) == -1){

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

if(setuid(uid) == -1){

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1517

const float delay){

1518

struct dirent **direntries;

1519

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

1520

alphasort);

1521

if(numhooks == -1){

1522

if(errno == ENOENT){

1523

if(debug){

1524

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

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

1534

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

1535

direntry = direntries[i];

1536

char *fullname = NULL;

1537

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

1538

if(ret < 0){

1539

perror_plus("asprintf");

1540

continue;

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1546

pid_t hook_pid = fork();

1547

if(hook_pid == 0){

1548

/* Child */

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

perror_plus("dup2(devnull, STDIN_FILENO)");

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1581

_exit(EX_OSERR);

1582

}

1583

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

1584

if(ret == -1){

1585

perror_plus("setenv");

1586

_exit(EX_OSERR);

1587

}

1588

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

1589

if(ret == -1){

1590

perror_plus("setenv");

1591

_exit(EX_OSERR);

1592

}

1593

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

1594

if(ret == -1){

1595

perror_plus("setenv");

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

char *delaystring;

1604

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

1605

if(ret == -1){

1606

perror_plus("asprintf");

1607

_exit(EX_OSERR);

1608

}

1609

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

1610

if(ret == -1){

1611

free(delaystring);

1612

perror_plus("setenv");

1613

_exit(EX_OSERR);

1614

}

1615

free(delaystring);

1616

if(connect_to != NULL){

1617

ret = setenv("CONNECT", connect_to, 1);

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1627

} else {

1628

int status;

1629

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

1630

perror_plus("waitpid");

1631

free(fullname);

1632

continue;

1633

}

1634

if(WIFEXITED(status)){

1635

if(WEXITSTATUS(status) != 0){

1636

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

1637

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

1638

WEXITSTATUS(status));

1639

free(fullname);

1640

continue;

1641

}

1642

} else if(WIFSIGNALED(status)){

1643

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

1644

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

1645

WTERMSIG(status));

1646

free(fullname);

1647

continue;

1648

} else {

1649

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

1650

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

1651

free(fullname);

1652

continue;

1653

}

1654

}

1655

free(fullname);

1656

if(debug){

1657

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

1658

direntry->d_name);

1659

}

1660

}

1661

close(devnull);

1662

}

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

if(not get_flags(interface, &network)){

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

network.ifr_flags |= IFF_UP; /* set flag */

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1721

1722

#ifdef __linux__

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

1734

}

1735

#endif /* __linux__ */

1736

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1737

ioctl_errno = errno;

1738

#ifdef __linux__

1739

if(restore_loglevel){

1740

ret_linux = klogctl(7, NULL, 0);

1741

if(ret_linux == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1756

1757

/* Close the socket */

1758

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

1759

if(ret == -1){

1760

perror_plus("close");

1761

}

1762

1763

if(ret_setflags == -1){

1764

errno = ioctl_errno;

1765

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1766

errno = old_errno;

1767

return ioctl_errno;

1768

}

1769

} else if(debug){

1770

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1771

interface);

1772

}

1773

1774

/* Sleep checking until interface is running.

1775

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

1776

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

1777

if(interface_is_running(interface)){

1070

1778

break;

1071

1779

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1780

struct timespec sleeptime = { .tv_nsec = 250000000 };

1781

ret = nanosleep(&sleeptime, NULL);

1782

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

1783

perror_plus("nanosleep");

1784

}

1785

}

1786

1787

errno = old_errno;

1788

return 0;

1789

}

1790

1791

__attribute__((nonnull, warn_unused_result))

1792

error_t take_down_interface(const char *const interface){

1793

error_t old_errno = errno;

1794

struct ifreq network;

1795

unsigned int if_index = if_nametoindex(interface);

1796

if(if_index == 0){

1797

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

1798

errno = old_errno;

1799

return ENXIO;

1800

}

1801

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1803

if(not get_flags(interface, &network) and debug){

1804

ret_errno = errno;

1805

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

1806

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

1807

errno = old_errno;

1808

return ret_errno;

1809

}

1810

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

1811

1812

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

1813

if(sd == -1){

1814

ret_errno = errno;

1815

perror_plus("socket");

1816

errno = old_errno;

1817

return ret_errno;

1818

}

1819

1820

if(debug){

1821

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

1822

interface);

1823

}

1824

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

1843

1844

/* Close the socket */

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1849

1850

if(ret_setflags == -1){

1851

errno = ioctl_errno;

1852

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1853

errno = old_errno;

1854

return ioctl_errno;

1855

}

1856

} else if(debug){

1857

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1858

interface);

1859

}

1860

1861

errno = old_errno;

1862

return 0;

1120

1863

}

1121

1864

1122

1865

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

1866

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1867

.priority = "SECURE256:!CTYPE-X.509:"

1868

"+CTYPE-OPENPGP", .current_server = NULL,

1869

.interfaces = NULL, .interfaces_size = 0 };

1123

1870

AvahiSServiceBrowser *sb = NULL;

1124

int error;

1871

error_t ret_errno;

1125

1872

int ret;

1126

1873

intmax_t tmpmax;

1127

1874

char *tmp;

1128

1875

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1135

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

1136

bool tempdir_created = false;

1876

char *interfaces_to_take_down = NULL;

1877

size_t interfaces_to_take_down_size = 0;

1878

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1879

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

1880

char *tempdir = NULL;

1137

1881

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

1882

const char *seckey = PATHDIR "/" SECKEY;

1139

1883

const char *pubkey = PATHDIR "/" PUBKEY;

1884

char *interfaces_hooks = NULL;

1140

1885

1141

1886

bool gnutls_initialized = false;

1142

1887

bool gpgme_initialized = false;

1143

1888

float delay = 2.5f;

1889

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

1890

retrying the same server again */

1144

1891

1145

1892

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1893

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1899

errno = 0;

1153

1900

ret = setgid(gid);

1154

1901

if(ret == -1){

1155

perror("setgid");

1902

perror_plus("setgid");

1156

1903

}

1157

1904

1158

1905

/* Lower user privileges (temporarily) */

1159

1906

errno = 0;

1160

1907

ret = seteuid(uid);

1161

1908

if(ret == -1){

1162

perror("seteuid");

1909

perror_plus("seteuid");

1163

1910

}

1164

1911

1165

1912

if(quit_now){

1200

1947

.arg = "SECONDS",

1201

1948

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

1202

1949

.group = 2 },

1950

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

1951

.arg = "SECONDS",

1952

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

1953

.group = 2 },

1954

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

1955

.arg = "DIR",

1956

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

1957

.group = 2 },

1203

1958

/*

1204

1959

* These reproduce what we would get without ARGP_NO_HELP

1205

1960

*/

1223

1978

connect_to = arg;

1224

1979

break;

1225

1980

case 'i': /* --interface */

1226

interface = arg;

1981

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

1982

arg, (int)',');

1983

if(ret_errno != 0){

1984

argp_error(state, "%s", strerror(ret_errno));

1985

}

1227

1986

break;

1228

1987

case 's': /* --seckey */

1229

1988

seckey = arg;

1249

2008

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

1250

2009

argp_error(state, "Bad delay");

1251

2010

}

2011

case 132: /* --retry */

2012

errno = 0;

2013

retry_interval = strtod(arg, &tmp);

2014

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

2015

or (retry_interval * 1000) > INT_MAX

2016

or retry_interval < 0){

2017

argp_error(state, "Bad retry interval");

2018

}

2019

break;

2020

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

2021

hookdir = arg;

1252

2022

break;

1253

2023

/*

1254

2024

* These reproduce what we would get without ARGP_NO_HELP

1261

2031

argp_state_help(state, state->out_stream,

1262

2032

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

2033

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

1264

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

2034

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

1265

2035

exit(argp_err_exit_status);

1266

2036

break;

1267

2037

default:

1282

2052

case ENOMEM:

1283

2053

default:

1284

2054

errno = ret;

1285

perror("argp_parse");

2055

perror_plus("argp_parse");

1286

2056

exitcode = EX_OSERR;

1287

2057

goto end;

1288

2058

case EINVAL:

1290

2060

goto end;

1291

2061

}

1292

2062

}

2063

2064

{

2065

/* Work around Debian bug #633582:

2066

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

2067

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

2074

struct stat st;

2075

2076

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

2077

int seckey_fd = open(seckey, O_RDONLY);

2078

if(seckey_fd == -1){

2079

perror_plus("open");

2080

} else {

2081

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

2082

if(ret == -1){

2083

perror_plus("fstat");

2084

} else {

2085

if(S_ISREG(st.st_mode)

2086

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

2087

ret = fchown(seckey_fd, uid, gid);

2088

if(ret == -1){

2089

perror_plus("fchown");

2090

}

2091

}

2092

}

2093

TEMP_FAILURE_RETRY(close(seckey_fd));

2094

}

2095

}

2096

2097

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

2098

int pubkey_fd = open(pubkey, O_RDONLY);

2099

if(pubkey_fd == -1){

2100

perror_plus("open");

2101

} else {

2102

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

2103

if(ret == -1){

2104

perror_plus("fstat");

2105

} else {

2106

if(S_ISREG(st.st_mode)

2107

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

2108

ret = fchown(pubkey_fd, uid, gid);

2109

if(ret == -1){

2110

perror_plus("fchown");

2111

}

2112

}

2113

}

2114

TEMP_FAILURE_RETRY(close(pubkey_fd));

2115

}

2116

}

2117

2118

/* Lower privileges */

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2123

}

2124

}

2125

}

2126

2127

/* Remove invalid interface names (except "none") */

2128

{

2129

char *interface = NULL;

2130

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2131

interface))){

2132

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

2133

and if_nametoindex(interface) == 0){

2134

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

2135

fprintf_plus(stderr, "Not using nonexisting interface"

2136

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

2137

}

2138

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2139

interface = NULL;

2140

}

2141

}

2142

}

2143

2144

/* Run network hooks */

2145

{

2146

if(mc.interfaces != NULL){

2147

interfaces_hooks = malloc(mc.interfaces_size);

2148

if(interfaces_hooks == NULL){

2149

perror_plus("malloc");

2150

goto end;

2151

}

2152

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2153

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2154

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

interfaces_hooks : "", delay);

2157

}

1293

2158

1294

2159

if(not debug){

1295

2160

avahi_set_log_function(empty_log);

1296

2161

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

2162

1323

2163

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

1324

2164

from the signal handler */

1325

2165

/* Initialize the pseudo-RNG for Avahi */

1326

2166

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

2167

simple_poll = avahi_simple_poll_new();

2168

if(simple_poll == NULL){

2169

fprintf_plus(stderr,

2170

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

1330

2171

exitcode = EX_UNAVAILABLE;

1331

2172

goto end;

1332

2173

}

1334

2175

sigemptyset(&sigterm_action.sa_mask);

1335

2176

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

1336

2177

if(ret == -1){

1337

perror("sigaddset");

2178

perror_plus("sigaddset");

1338

2179

exitcode = EX_OSERR;

1339

2180

goto end;

1340

2181

}

1341

2182

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

1342

2183

if(ret == -1){

1343

perror("sigaddset");

2184

perror_plus("sigaddset");

1344

2185

exitcode = EX_OSERR;

1345

2186

goto end;

1346

2187

}

1347

2188

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

1348

2189

if(ret == -1){

1349

perror("sigaddset");

2190

perror_plus("sigaddset");

1350

2191

exitcode = EX_OSERR;

1351

2192

goto end;

1352

2193

}

1356

2197

*/

1357

2198

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

1358

2199

if(ret == -1){

1359

perror("sigaction");

2200

perror_plus("sigaction");

1360

2201

return EX_OSERR;

1361

2202

}

1362

2203

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2204

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

1364

2205

if(ret == -1){

1365

perror("sigaction");

2206

perror_plus("sigaction");

1366

2207

exitcode = EX_OSERR;

1367

2208

goto end;

1368

2209

}

1369

2210

}

1370

2211

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

1371

2212

if(ret == -1){

1372

perror("sigaction");

2213

perror_plus("sigaction");

1373

2214

return EX_OSERR;

1374

2215

}

1375

2216

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2217

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

1377

2218

if(ret == -1){

1378

perror("sigaction");

2219

perror_plus("sigaction");

1379

2220

exitcode = EX_OSERR;

1380

2221

goto end;

1381

2222

}

1382

2223

}

1383

2224

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

1384

2225

if(ret == -1){

1385

perror("sigaction");

2226

perror_plus("sigaction");

1386

2227

return EX_OSERR;

1387

2228

}

1388

2229

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2230

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

1390

2231

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

2232

perror_plus("sigaction");

2233

exitcode = EX_OSERR;

2234

goto end;

2235

}

2236

}

2237

2238

/* If no interfaces were specified, make a list */

2239

if(mc.interfaces == NULL){

2240

struct dirent **direntries;

2241

/* Look for any good interfaces */

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2243

alphasort);

2244

if(ret >= 1){

2245

/* Add all found interfaces to interfaces list */

2246

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

2247

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2248

direntries[i]->d_name);

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("argz_add");

2252

continue;

2253

}

2254

if(debug){

2255

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2256

direntries[i]->d_name);

2257

}

2258

}

2259

free(direntries);

2260

} else {

2261

free(direntries);

2262

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

2263

exitcode = EXIT_FAILURE;

2264

goto end;

2265

}

2266

}

2267

2268

/* Bring up interfaces which are down, and remove any "none"s */

2269

{

2270

char *interface = NULL;

2271

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2272

interface))){

2273

/* If interface name is "none", stop bringing up interfaces.

2274

Also remove all instances of "none" from the list */

2275

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

2276

argz_delete(&mc.interfaces, &mc.interfaces_size,

2277

interface);

2278

interface = NULL;

2279

while((interface = argz_next(mc.interfaces,

2280

mc.interfaces_size, interface))){

2281

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

2282

argz_delete(&mc.interfaces, &mc.interfaces_size,

2283

interface);

2284

interface = NULL;

1482

2285

}

1483

2286

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

2287

break;

1501

2288

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2289

bool interface_was_up = interface_is_up(interface);

2290

errno = bring_up_interface(interface, delay);

2291

if(not interface_was_up){

2292

if(errno != 0){

2293

perror_plus("Failed to bring up interface");

2294

} else {

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2301

}

2302

}

2303

}

2304

if(debug and (interfaces_to_take_down == NULL)){

2305

fprintf_plus(stderr, "No interfaces were brought up\n");

2306

}

2307

}

2308

2309

/* If we only got one interface, explicitly use only that one */

2310

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2311

if(debug){

2312

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2313

mc.interfaces);

2314

}

2315

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1539

2316

}

1540

2317

1541

2318

if(quit_now){

1542

2319

goto end;

1543

2320

}

1544

2321

1545

ret = init_gnutls_global(pubkey, seckey);

2322

ret = init_gnutls_global(pubkey, seckey, &mc);

1546

2323

if(ret == -1){

1547

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

2324

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

1548

2325

exitcode = EX_UNAVAILABLE;

1549

2326

goto end;

1550

2327

} else {

1555

2332

goto end;

1556

2333

}

1557

2334

1558

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

2335

/* Try /run/tmp before /tmp */

2336

tempdir = mkdtemp(run_tempdir);

2337

if(tempdir == NULL and errno == ENOENT){

2338

if(debug){

2339

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

2345

perror_plus("mkdtemp");

1562

2346

goto end;

1563

2347

}

1564

2348

1566

2350

goto end;

1567

2351

}

1568

2352

1569

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

1570

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

2353

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

2354

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

1571

2355

exitcode = EX_UNAVAILABLE;

1572

2356

goto end;

1573

2357

} else {

1582

2366

/* Connect directly, do not use Zeroconf */

1583

2367

/* (Mainly meant for debugging) */

1584

2368

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

2369

1585

2370

if(address == NULL){

1586

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

2371

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

1587

2372

exitcode = EX_USAGE;

1588

2373

goto end;

1589

2374

}

1592

2377

goto end;

1593

2378

}

1594

2379

1595

uint16_t port;

2380

in_port_t port;

1596

2381

errno = 0;

1597

2382

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

1598

2383

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2384

or tmpmax != (in_port_t)tmpmax){

2385

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

1601

2386

exitcode = EX_USAGE;

1602

2387

goto end;

1603

2388

}

1604

2389

1605

2390

if(quit_now){

1606

2391

goto end;

1607

2392

}

1608

2393

1609

port = (uint16_t)tmpmax;

2394

port = (in_port_t)tmpmax;

1610

2395

*address = '\0';

1611

address = connect_to;

1612

2396

/* Colon in address indicates IPv6 */

1613

2397

int af;

1614

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

2398

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

1615

2399

af = AF_INET6;

2400

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

2401

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

2402

{

2403

connect_to++;

2404

address[-1] = '\0';

2405

}

1616

2406

} else {

1617

2407

af = AF_INET;

1618

2408

}

2409

address = connect_to;

1619

2410

1620

2411

if(quit_now){

1621

2412

goto end;

1622

2413

}

1623

2414

1624

2415

while(not quit_now){

1625

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

2416

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

2417

&mc);

1626

2418

if(quit_now or ret == 0){

1627

2419

break;

1628

2420

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

2421

if(debug){

2422

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

2423

(int)retry_interval);

2424

}

2425

sleep((unsigned int)retry_interval);

2426

}

2427

2428

if(not quit_now){

1633

2429

exitcode = EXIT_SUCCESS;

1634

2430

}

1635

2431

1636

2432

goto end;

1637

2433

}

1638

2434

1650

2446

config.publish_domain = 0;

1651

2447

1652

2448

/* Allocate a new server */

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2449

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2450

&config, NULL, NULL, &ret_errno);

1656

2451

1657

2452

/* Free the Avahi configuration data */

1658

2453

avahi_server_config_free(&config);

1660

2455

1661

2456

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

1662

2457

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2458

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

2459

avahi_strerror(ret_errno));

1665

2460

exitcode = EX_UNAVAILABLE;

1666

2461

goto end;

1667

2462

}

1673

2468

/* Create the Avahi service browser */

1674

2469

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

2470

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

2471

NULL, 0, browse_callback,

2472

(void *)&mc);

1677

2473

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2474

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

2475

avahi_strerror(avahi_server_errno(mc.server)));

1680

2476

exitcode = EX_UNAVAILABLE;

1681

2477

goto end;

1682

2478

}

1688

2484

/* Run the main loop */

1689

2485

1690

2486

if(debug){

1691

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

2487

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

1692

2488

}

1693

2489

1694

avahi_simple_poll_loop(mc.simple_poll);

2490

ret = avahi_loop_with_timeout(simple_poll,

2491

(int)(retry_interval * 1000), &mc);

2492

if(debug){

2493

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

2494

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

2495

}

1695

2496

1696

2497

end:

1697

2498

1698

2499

if(debug){

1699

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

2500

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

1700

2501

}

1701

2502

1702

2503

/* Cleanup things */

2504

free(mc.interfaces);

2505

1703

2506

if(sb != NULL)

1704

2507

avahi_s_service_browser_free(sb);

1705

2508

1706

2509

if(mc.server != NULL)

1707

2510

avahi_server_free(mc.server);

1708

2511

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2512

if(simple_poll != NULL)

2513

avahi_simple_poll_free(simple_poll);

1711

2514

1712

2515

if(gnutls_initialized){

1713

2516

gnutls_certificate_free_credentials(mc.cred);

1719

2522

gpgme_release(mc.ctx);

1720

2523

}

1721

2524

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

2525

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

2526

has seen */

2527

if(mc.current_server != NULL){

2528

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

2529

while(mc.current_server != NULL){

2530

server *next = mc.current_server->next;

2531

free(mc.current_server);

2532

mc.current_server = next;

1751

2533

}

1752

2534

}

1753

2535

1754

/* Removes the temp directory used by GPGME */

1755

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

2536

/* Re-raise privileges */

2537

{

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

1763

2541

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

/* Take down the network interfaces which were brought up */

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

if(debug and (interfaces_to_take_down == NULL)){

2560

fprintf_plus(stderr, "No interfaces needed to be taken"

2561

" down\n");

2562

}

2563

}

2564

}

2565

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2569

}

2570

}

2571

2572

free(interfaces_to_take_down);

2573

free(interfaces_hooks);

2574

2575

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

2576

if(tempdir != NULL){

2577

struct dirent **direntries = NULL;

2578

struct dirent *direntry = NULL;

2579

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

2580

alphasort);

2581

if(numentries > 0){

2582

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

2583

direntry = direntries[i];

1776

2584

char *fullname = NULL;

1777

2585

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

1778

2586

direntry->d_name);

1779

2587

if(ret < 0){

1780

perror("asprintf");

2588

perror_plus("asprintf");

1781

2589

continue;

1782

2590

}

1783

2591

ret = remove(fullname);

1784

2592

if(ret == -1){

1785

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

1786

strerror(errno));

2593

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

2594

strerror(errno));

1787

2595

}

1788

2596

free(fullname);

1789

2597

}

1790

closedir(d);

2598

}

2599

2600

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

2601

free(direntries);

2602

if(numentries == -1){

2603

perror_plus("scandir");

1791

2604

}

1792

2605

ret = rmdir(tempdir);

1793

2606

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

1794

perror("rmdir");

2607

perror_plus("rmdir");

1795

2608

}

1796

2609

}

1797

2610

1802

2615

&old_sigterm_action,

1803

2616

NULL));

1804

2617

if(ret == -1){

1805

perror("sigaction");

2618

perror_plus("sigaction");

1806

2619

}

1807

2620

do {

1808

2621

ret = raise(signal_received);

1809

2622

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

1810

2623

if(ret != 0){

1811

perror("raise");

2624

perror_plus("raise");

1812

2625

abort();

1813

2626

}

1814

2627

TEMP_FAILURE_RETRY(pause());