/mandos/release : revision 237.7.492

9

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

10

*

11

* Everything else is

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

17

* published by the Free Software Foundation, either version 3 of the

18

* License, or (at your option) any later version.

19

*

20

* This program is distributed in the hope that it will be useful, but

12

13

14

*

15

* This file is part of Mandos.

16

*

17

* Mandos is free software: you can redistribute it and/or modify it

18

* under the terms of the GNU General Public License as published by

19

* the Free Software Foundation, either version 3 of the License, or

20

* (at your option) any later version.

21

*

22

* Mandos is distributed in the hope that it will be useful, but

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

23

25

* General Public License for more details.

24

26

*

25

27

* You should have received a copy of the GNU General Public License

26

* along with this program. If not, see

27

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

28

* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

28

29

*

29

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

30

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

30

31

*/

31

32

33

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

33

34

#ifndef _LARGEFILE_SOURCE

34

35

#define _LARGEFILE_SOURCE

35

#endif

36

#endif /* not _LARGEFILE_SOURCE */

36

37

#ifndef _FILE_OFFSET_BITS

37

38

#define _FILE_OFFSET_BITS 64

38

#endif

39

#endif /* not _FILE_OFFSET_BITS */

39

40

41

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

43

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

43

stdout, ferror(), remove() */

44

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

44

stdout, ferror() */

45

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

45

46

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

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

#include <sys/ioctl.h> /* ioctl */

52

54

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

53

55

sockaddr_in6, PF_INET6,

54

56

SOCK_STREAM, uid_t, gid_t, open(),

55

57

opendir(), DIR */

56

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

58

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

57

59

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

58

inet_pton(), connect() */

59

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

60

63

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

61

64

*/

62

65

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

63

66

strtoimax() */

64

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

65

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

72

program_invocation_short_name */

66

73

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

67

74

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

68

75

SIOCSIFFLAGS, if_indextoname(),

72

79

*/

73

80

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

74

81

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

75

setgid(), pause() */

76

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

82

setgid(), pause(), _exit(),

83

unlinkat() */

84

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

77

85

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

78

86

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

79

87

argp_state, struct argp,

84

92

raise() */

85

93

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

86

94

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

95

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

96

WEXITSTATUS(), WTERMSIG() */

97

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

98

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

99

argz_delete(), argz_append(),

100

argz_stringify(), argz_add(),

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

87

104

88

105

#ifdef __linux__

89

106

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

107

124

init_gnutls_session(),

108

125

GNUTLS_* */

109

126

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

127

/* gnutls_certificate_set_openpgp_key_file(),

128

GNUTLS_OPENPGP_FMT_BASE64 */

112

129

113

130

/* GPGME */

114

131

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

122

139

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

123

140

#define SECKEY "seckey.txt"

124

141

#define PUBKEY "pubkey.txt"

142

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

125

143

126

144

bool debug = false;

127

145

static const char mandos_protocol_version[] = "1";

128

146

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

129

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

147

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

130

148

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

131

149

char *connect_to = NULL;

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

uid_t uid = 65534;

153

gid_t gid = 65534;

132

154

133

/* Doubly linked list that need to be circular linked when ever used */

155

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

134

156

typedef struct server{

135

157

const char *ip;

136

uint16_t port;

158

in_port_t port;

137

159

AvahiIfIndex if_index;

138

160

int af;

139

161

struct timespec last_seen;

143

165

144

166

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

145

167

typedef struct {

146

AvahiSimplePoll *simple_poll;

147

168

AvahiServer *server;

148

169

gnutls_certificate_credentials_t cred;

149

170

unsigned int dh_bits;

151

172

const char *priority;

152

173

gpgme_ctx_t ctx;

153

174

server *current_server;

175

char *interfaces;

176

size_t interfaces_size;

154

177

} mandos_context;

155

178

156

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

157

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

158

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

179

/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

160

181

161

182

sig_atomic_t quit_now = 0;

162

183

int signal_received = 0;

163

184

164

185

/* Function to use when printing errors */

165

186

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

187

int e = errno;

188

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

189

program_invocation_short_name);

190

errno = e;

167

191

perror(print_text);

168

192

}

169

193

194

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

195

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

196

va_list ap;

197

va_start (ap, format);

198

199

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

200

program_invocation_short_name));

201

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

202

}

203

170

204

/*

171

205

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

172

206

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

173

207

* "buffer_length" is how much is already used.

174

208

*/

209

__attribute__((nonnull, warn_unused_result))

175

210

size_t incbuffer(char **buffer, size_t buffer_length,

176

size_t buffer_capacity){

211

size_t buffer_capacity){

177

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

178

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

179

if(buffer == NULL){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

180

219

return 0;

181

220

}

221

*buffer = new_buf;

182

222

buffer_capacity += BUFFER_SIZE;

183

223

}

184

224

return buffer_capacity;

185

225

}

186

226

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

227

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

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

190

231

int ret;

191

232

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

192

233

if(new_server == NULL){

193

234

perror_plus("malloc");

194

return -1;

235

return false;

195

236

}

196

237

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

238

.port = port,

239

.if_index = if_index,

240

.af = af };

200

241

if(new_server->ip == NULL){

201

242

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

free((char *)(new_server->ip));

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

258

return false;

259

}

260

/* Special case of first server */

261

if(*current_server == NULL){

206

262

new_server->next = new_server;

207

263

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

264

*current_server = new_server;

210

265

} else {

211

new_server->next = mc.current_server;

212

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

266

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

267

new_server->next = *current_server;

268

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

213

269

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

270

(*current_server)->prev = new_server;

271

}

272

return true;

222

273

}

223

274

224

275

/*

225

276

* Initialize GPGME.

226

277

*/

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

229

283

gpgme_error_t rc;

230

284

gpgme_engine_info_t engine_info;

231

285

232

233

286

/*

234

287

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

235

288

*/

236

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

237

290

int ret;

238

291

int fd;

239

292

gpgme_data_t pgp_data;

246

299

247

300

rc = gpgme_data_new_from_fd(&pgp_data, fd);

248

301

if(rc != GPG_ERR_NO_ERROR){

249

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

250

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

251

304

return false;

252

305

}

253

306

254

rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

255

308

if(rc != GPG_ERR_NO_ERROR){

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

258

311

return false;

259

312

}

260

313

261

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

314

ret = close(fd);

262

315

if(ret == -1){

263

316

perror_plus("close");

264

317

}

267

320

}

268

321

269

322

if(debug){

270

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

323

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

271

324

}

272

325

273

326

/* Init GPGME */

274

327

gpgme_check_version(NULL);

275

328

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

276

329

if(rc != GPG_ERR_NO_ERROR){

277

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

278

gpgme_strsource(rc), gpgme_strerror(rc));

330

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

331

gpgme_strsource(rc), gpgme_strerror(rc));

279

332

return false;

280

333

}

281

334

282

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

335

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

283

336

rc = gpgme_get_engine_info(&engine_info);

284

337

if(rc != GPG_ERR_NO_ERROR){

285

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

286

gpgme_strsource(rc), gpgme_strerror(rc));

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

287

340

return false;

288

341

}

289

342

while(engine_info != NULL){

295

348

engine_info = engine_info->next;

296

349

}

297

350

if(engine_info == NULL){

298

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

351

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

352

tempdir);

299

353

return false;

300

354

}

301

355

302

356

/* Create new GPGME "context" */

303

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

357

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

304

358

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

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

361

gpgme_strerror(rc));

307

362

return false;

308

363

}

309

364

318

373

* Decrypt OpenPGP data.

319

374

* Returns -1 on error

320

375

*/

376

__attribute__((nonnull, warn_unused_result))

321

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

322

378

size_t crypto_size,

323

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

324

381

gpgme_data_t dh_crypto, dh_plain;

325

382

gpgme_error_t rc;

326

383

ssize_t ret;

328

385

ssize_t plaintext_length = 0;

329

386

330

387

if(debug){

331

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

388

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

332

389

}

333

390

334

391

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

335

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

393

0);

337

394

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

340

397

return -1;

341

398

}

342

399

343

400

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

344

401

rc = gpgme_data_new(&dh_plain);

345

402

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

348

406

gpgme_data_release(dh_crypto);

349

407

return -1;

350

408

}

351

409

352

410

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

353

411

data buffer */

354

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

412

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

355

413

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

358

416

plaintext_length = -1;

359

417

if(debug){

360

418

gpgme_decrypt_result_t result;

361

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

362

420

if(result == NULL){

363

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

421

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

364

422

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

423

if(result->unsupported_algorithm != NULL) {

424

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

425

result->unsupported_algorithm);

426

}

427

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

428

result->wrong_key_usage);

369

429

if(result->file_name != NULL){

370

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

430

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

371

431

}

372

432

gpgme_recipient_t recipient;

373

433

recipient = result->recipients;

374

434

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

435

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

436

gpgme_pubkey_algo_name

437

(recipient->pubkey_algo));

438

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

439

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

440

recipient->status == GPG_ERR_NO_SECKEY

441

? "No" : "Yes");

381

442

recipient = recipient->next;

382

443

}

383

444

}

386

447

}

387

448

388

449

if(debug){

389

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

450

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

390

451

}

391

452

392

453

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

399

460

*plaintext = NULL;

400

461

while(true){

401

462

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

463

(size_t)plaintext_length,

464

plaintext_capacity);

404

465

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

466

perror_plus("incbuffer");

467

plaintext_length = -1;

468

goto decrypt_end;

408

469

}

409

470

410

471

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

484

}

424

485

425

486

if(debug){

426

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

487

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

427

488

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

428

489

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

429

490

}

440

501

return plaintext_length;

441

502

}

442

503

443

static const char * safer_gnutls_strerror(int value){

444

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

445

-Wunreachable-code */

446

if(ret == NULL)

447

ret = "(unknown)";

448

return ret;

504

__attribute__((warn_unused_result, const))

505

static const char *safe_string(const char *str){

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

511

__attribute__((warn_unused_result))

512

static const char *safer_gnutls_strerror(int value){

513

const char *ret = gnutls_strerror(value);

514

return safe_string(ret);

449

515

}

450

516

451

517

/* GnuTLS log function callback */

518

__attribute__((nonnull))

452

519

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

453

520

const char* string){

454

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

521

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

455

522

}

456

523

524

__attribute__((nonnull(1, 2, 4), warn_unused_result))

457

525

static int init_gnutls_global(const char *pubkeyfilename,

458

const char *seckeyfilename){

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

528

mandos_context *mc){

459

529

int ret;

530

unsigned int uret;

460

531

461

532

if(debug){

462

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

463

}

464

465

ret = gnutls_global_init();

466

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

469

return -1;

533

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

470

534

}

471

535

472

536

if(debug){

478

542

}

479

543

480

544

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

545

ret = gnutls_certificate_allocate_credentials(&mc->cred);

482

546

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

488

gnutls_global_deinit();

547

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

548

safer_gnutls_strerror(ret));

489

549

return -1;

490

550

}

491

551

492

552

if(debug){

493

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

494

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

495

seckeyfilename);

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

496

557

}

497

558

498

559

ret = gnutls_certificate_set_openpgp_key_file

499

(mc.cred, pubkeyfilename, seckeyfilename,

560

(mc->cred, pubkeyfilename, seckeyfilename,

500

561

GNUTLS_OPENPGP_FMT_BASE64);

501

562

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

507

568

goto globalfail;

508

569

}

509

570

510

571

/* GnuTLS server initialization */

511

ret = gnutls_dh_params_init(&mc.dh_params);

512

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

515

goto globalfail;

516

}

517

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

518

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

521

goto globalfail;

522

}

523

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

/* If a Diffie-Hellman parameters file was given, try to use it */

580

if(dhparamsfilename != NULL){

581

gnutls_datum_t params = { .data = NULL, .size = 0 };

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

ret = close(dhpfile);

619

if(ret == -1){

620

perror_plus("close");

621

}

622

if(params.data == NULL){

623

dhparamsfilename = NULL;

624

}

625

if(dhparamsfilename == NULL){

626

break;

627

}

628

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

629

GNUTLS_X509_FMT_PEM);

630

if(ret != GNUTLS_E_SUCCESS){

631

fprintf_plus(stderr, "Failed to parse DH parameters in file"

632

" \"%s\": %s\n", dhparamsfilename,

633

safer_gnutls_strerror(ret));

634

dhparamsfilename = NULL;

635

}

636

free(params.data);

637

} while(false);

638

}

639

if(dhparamsfilename == NULL){

640

if(mc->dh_bits == 0){

641

/* Find out the optimal number of DH bits */

642

/* Try to read the private key file */

643

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

644

do {

645

int secfile = open(seckeyfilename, O_RDONLY);

646

if(secfile == -1){

647

perror_plus("open");

648

break;

649

}

650

size_t buffer_capacity = 0;

651

while(true){

652

buffer_capacity = incbuffer((char **)&buffer.data,

653

(size_t)buffer.size,

654

(size_t)buffer_capacity);

655

if(buffer_capacity == 0){

656

perror_plus("incbuffer");

657

free(buffer.data);

658

buffer.data = NULL;

659

break;

660

}

661

ssize_t bytes_read = read(secfile,

662

buffer.data + buffer.size,

663

BUFFER_SIZE);

664

/* EOF */

665

if(bytes_read == 0){

666

break;

667

}

668

/* check bytes_read for failure */

669

if(bytes_read < 0){

670

perror_plus("read");

671

free(buffer.data);

672

buffer.data = NULL;

673

break;

674

}

675

buffer.size += (unsigned int)bytes_read;

676

}

677

close(secfile);

678

} while(false);

679

/* If successful, use buffer to parse private key */

680

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

681

if(buffer.data != NULL){

682

{

683

gnutls_openpgp_privkey_t privkey = NULL;

684

ret = gnutls_openpgp_privkey_init(&privkey);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

689

free(buffer.data);

690

buffer.data = NULL;

691

} else {

692

ret = gnutls_openpgp_privkey_import

693

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

694

if(ret != GNUTLS_E_SUCCESS){

695

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

696

safer_gnutls_strerror(ret));

697

privkey = NULL;

698

}

699

free(buffer.data);

700

buffer.data = NULL;

701

if(privkey != NULL){

702

/* Use private key to suggest an appropriate

703

sec_param */

704

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

705

gnutls_openpgp_privkey_deinit(privkey);

706

if(debug){

707

fprintf_plus(stderr, "This OpenPGP key implies using"

708

" a GnuTLS security parameter \"%s\".\n",

709

safe_string(gnutls_sec_param_get_name

710

(sec_param)));

711

}

712

}

713

}

714

}

715

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

716

/* Err on the side of caution */

717

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

if(debug){

719

fprintf_plus(stderr, "Falling back to security parameter"

720

" \"%s\"\n",

721

safe_string(gnutls_sec_param_get_name

722

(sec_param)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

731

" implies %u DH bits; using that.\n",

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

fprintf_plus(stderr, "Failed to get implied number of DH"

738

" bits for security parameter \"%s\"): %s\n",

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

744

} else if(debug){

745

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

746

mc->dh_bits);

747

}

748

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

749

if(ret != GNUTLS_E_SUCCESS){

750

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

751

" bits): %s\n", mc->dh_bits,

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

756

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

525

757

526

758

return 0;

527

759

528

760

globalfail:

529

761

530

gnutls_certificate_free_credentials(mc.cred);

531

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

762

gnutls_certificate_free_credentials(mc->cred);

763

gnutls_dh_params_deinit(mc->dh_params);

533

764

return -1;

534

765

}

535

766

536

static int init_gnutls_session(gnutls_session_t *session){

767

__attribute__((nonnull, warn_unused_result))

768

static int init_gnutls_session(gnutls_session_t *session,

769

mandos_context *mc){

537

770

int ret;

538

771

/* GnuTLS session creation */

539

772

do {

543

776

}

544

777

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

545

778

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

779

fprintf_plus(stderr,

780

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

781

safer_gnutls_strerror(ret));

548

782

}

549

783

550

784

{

551

785

const char *err;

552

786

do {

553

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

787

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

554

788

if(quit_now){

555

789

gnutls_deinit(*session);

556

790

return -1;

557

791

}

558

792

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

559

793

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

794

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

795

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

796

safer_gnutls_strerror(ret));

563

797

gnutls_deinit(*session);

564

798

return -1;

565

799

}

567

801

568

802

do {

569

803

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

804

mc->cred);

571

805

if(quit_now){

572

806

gnutls_deinit(*session);

573

807

return -1;

574

808

}

575

809

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

576

810

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

811

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

812

safer_gnutls_strerror(ret));

579

813

gnutls_deinit(*session);

580

814

return -1;

581

815

}

583

817

/* ignore client certificate if any. */

584

818

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

585

819

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

588

820

return 0;

589

821

}

590

822

592

824

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

593

825

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

594

826

827

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

828

__attribute__((warn_unused_result))

829

int raise_privileges(void){

830

int old_errno = errno;

831

int ret = 0;

832

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

833

ret = errno;

834

}

835

errno = old_errno;

836

return ret;

837

}

838

839

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

840

__attribute__((warn_unused_result))

841

int raise_privileges_permanently(void){

842

int old_errno = errno;

843

int ret = raise_privileges();

844

if(ret != 0){

845

errno = old_errno;

846

return ret;

847

}

848

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

849

ret = errno;

850

}

851

errno = old_errno;

852

return ret;

853

}

854

855

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

856

__attribute__((warn_unused_result))

857

int lower_privileges(void){

858

int old_errno = errno;

859

int ret = 0;

860

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

861

ret = errno;

862

}

863

errno = old_errno;

864

return ret;

865

}

866

867

/* Lower privileges permanently */

868

__attribute__((warn_unused_result))

869

int lower_privileges_permanently(void){

870

int old_errno = errno;

871

int ret = 0;

872

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

873

ret = errno;

874

}

875

errno = old_errno;

876

return ret;

877

}

878

879

/* Helper function to add_local_route() and delete_local_route() */

880

__attribute__((nonnull, warn_unused_result))

881

static bool add_delete_local_route(const bool add,

882

const char *address,

883

AvahiIfIndex if_index){

884

int ret;

885

char helper[] = "mandos-client-iprouteadddel";

886

char add_arg[] = "add";

887

char delete_arg[] = "delete";

888

char debug_flag[] = "--debug";

889

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

890

if(pluginhelperdir == NULL){

891

if(debug){

892

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

893

" variable not set; cannot run helper\n");

894

}

895

return false;

896

}

897

898

char interface[IF_NAMESIZE];

899

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

900

perror_plus("if_indextoname");

901

return false;

902

}

903

904

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

905

if(devnull == -1){

906

perror_plus("open(\"/dev/null\", O_RDONLY)");

907

return false;

908

}

909

pid_t pid = fork();

910

if(pid == 0){

911

/* Child */

912

/* Raise privileges */

913

errno = raise_privileges_permanently();

914

if(errno != 0){

915

perror_plus("Failed to raise privileges");

916

/* _exit(EX_NOPERM); */

917

} else {

918

/* Set group */

919

errno = 0;

920

ret = setgid(0);

921

if(ret == -1){

922

perror_plus("setgid");

923

_exit(EX_NOPERM);

924

}

925

/* Reset supplementary groups */

926

errno = 0;

927

ret = setgroups(0, NULL);

928

if(ret == -1){

929

perror_plus("setgroups");

930

_exit(EX_NOPERM);

931

}

932

}

933

ret = dup2(devnull, STDIN_FILENO);

934

if(ret == -1){

935

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

936

_exit(EX_OSERR);

937

}

938

ret = close(devnull);

939

if(ret == -1){

940

perror_plus("close");

941

_exit(EX_OSERR);

942

}

943

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

944

if(ret == -1){

945

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

946

_exit(EX_OSERR);

947

}

948

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

949

O_RDONLY

950

| O_DIRECTORY

951

| O_PATH

952

| O_CLOEXEC));

953

if(helperdir_fd == -1){

954

perror_plus("open");

955

_exit(EX_UNAVAILABLE);

956

}

957

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

958

helper, O_RDONLY));

959

if(helper_fd == -1){

960

perror_plus("openat");

961

close(helperdir_fd);

962

_exit(EX_UNAVAILABLE);

963

}

964

close(helperdir_fd);

965

#ifdef __GNUC__

966

#pragma GCC diagnostic push

967

#pragma GCC diagnostic ignored "-Wcast-qual"

968

#endif

969

if(fexecve(helper_fd, (char *const [])

970

{ helper, add ? add_arg : delete_arg, (char *)address,

971

interface, debug ? debug_flag : NULL, NULL },

972

environ) == -1){

973

#ifdef __GNUC__

974

#pragma GCC diagnostic pop

975

#endif

976

perror_plus("fexecve");

977

_exit(EXIT_FAILURE);

978

}

979

}

980

if(pid == -1){

981

perror_plus("fork");

982

return false;

983

}

984

int status;

985

pid_t pret = -1;

986

errno = 0;

987

do {

988

pret = waitpid(pid, &status, 0);

989

if(pret == -1 and errno == EINTR and quit_now){

990

int errno_raising = 0;

991

if((errno = raise_privileges()) != 0){

992

errno_raising = errno;

993

perror_plus("Failed to raise privileges in order to"

994

" kill helper program");

995

}

996

if(kill(pid, SIGTERM) == -1){

997

perror_plus("kill");

998

}

999

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

1000

perror_plus("Failed to lower privileges after killing"

1001

" helper program");

1002

}

1003

return false;

1004

}

1005

} while(pret == -1 and errno == EINTR);

1006

if(pret == -1){

1007

perror_plus("waitpid");

1008

return false;

1009

}

1010

if(WIFEXITED(status)){

1011

if(WEXITSTATUS(status) != 0){

1012

fprintf_plus(stderr, "Error: iprouteadddel exited"

1013

" with status %d\n", WEXITSTATUS(status));

1014

return false;

1015

}

1016

return true;

1017

}

1018

if(WIFSIGNALED(status)){

1019

fprintf_plus(stderr, "Error: iprouteadddel died by"

1020

" signal %d\n", WTERMSIG(status));

1021

return false;

1022

}

1023

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1024

return false;

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool add_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

fprintf_plus(stderr, "Adding route to %s\n", address);

1032

}

1033

return add_delete_local_route(true, address, if_index);

1034

}

1035

1036

__attribute__((nonnull, warn_unused_result))

1037

static bool delete_local_route(const char *address,

1038

AvahiIfIndex if_index){

1039

if(debug){

1040

fprintf_plus(stderr, "Removing route to %s\n", address);

1041

}

1042

return add_delete_local_route(false, address, if_index);

1043

}

1044

595

1045

/* Called when a Mandos server is found */

596

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

1046

__attribute__((nonnull, warn_unused_result))

1047

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

597

1048

AvahiIfIndex if_index,

598

int af){

1049

int af, mandos_context *mc){

599

1050

int ret, tcp_sd = -1;

600

1051

ssize_t sret;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

1052

struct sockaddr_storage to;

605

1053

char *buffer = NULL;

606

1054

char *decrypted_buffer = NULL;

607

1055

size_t buffer_length = 0;

610

1058

int retval = -1;

611

1059

gnutls_session_t session;

612

1060

int pf; /* Protocol family */

1061

bool route_added = false;

613

1062

614

1063

errno = 0;

615

1064

626

1075

pf = PF_INET;

627

1076

break;

628

1077

default:

629

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

1078

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

630

1079

errno = EINVAL;

631

1080

return -1;

632

1081

}

633

1082

634

ret = init_gnutls_session(&session);

1083

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

1084

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

1085

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

1086

bool match = false;

1087

{

1088

char *interface = NULL;

1089

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

1090

mc->interfaces_size,

1091

interface))){

1092

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

1093

match = true;

1094

break;

1095

}

1096

}

1097

}

1098

if(not match){

1099

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

1100

connect to the server */

1101

if(debug){

1102

char interface[IF_NAMESIZE];

1103

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

1104

perror_plus("if_indextoname");

1105

} else {

1106

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

1107

" \"%s\"\n",

1108

if_indextoname((unsigned int)if_index,

1109

interface));

1110

}

1111

}

1112

return -1;

1113

}

1114

}

1115

1116

ret = init_gnutls_session(&session, mc);

635

1117

if(ret != 0){

636

1118

return -1;

637

1119

}

638

1120

639

1121

if(debug){

640

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

641

"\n", ip, port);

1122

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

1123

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

642

1124

}

643

1125

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

1126

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

645

1127

if(tcp_sd < 0){

646

1128

int e = errno;

647

1129

perror_plus("socket");

654

1136

goto mandos_end;

655

1137

}

656

1138

657

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

658

1139

if(af == AF_INET6){

659

to.in6.sin6_family = (sa_family_t)af;

660

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

1140

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1141

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1142

ret = inet_pton(af, ip, &to6->sin6_addr);

661

1143

} else { /* IPv4 */

662

to.in.sin_family = (sa_family_t)af;

663

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

1144

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1145

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1146

ret = inet_pton(af, ip, &to4->sin_addr);

664

1147

}

665

1148

if(ret < 0 ){

666

1149

int e = errno;

670

1153

}

671

1154

if(ret == 0){

672

1155

int e = errno;

673

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

1156

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

674

1157

errno = e;

675

1158

goto mandos_end;

676

1159

}

677

1160

if(af == AF_INET6){

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

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

684

-Wunreachable-code*/

1161

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

1162

if(IN6_IS_ADDR_LINKLOCAL

1163

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

685

1164

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

1165

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

1166

" incomplete without a network interface\n");

688

1167

errno = EINVAL;

689

1168

goto mandos_end;

690

1169

}

691

1170

/* Set the network interface number as scope */

692

to.in6.sin6_scope_id = (uint32_t)if_index;

1171

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

693

1172

}

694

1173

} else {

695

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

696

-Wconversion and

697

-Wunreachable-code */

1174

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

698

1175

}

699

1176

700

1177

if(quit_now){

708

1185

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

709

1186

perror_plus("if_indextoname");

710

1187

} else {

711

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

712

ip, interface, port);

1188

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

1189

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

713

1190

}

714

1191

} else {

715

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

716

port);

1192

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

1193

ip, (uintmax_t)port);

717

1194

}

718

1195

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

1196

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

720

const char *pcret;

721

if(af == AF_INET6){

722

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

723

sizeof(addrstr));

724

} else {

725

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

726

sizeof(addrstr));

727

}

728

if(pcret == NULL){

729

perror_plus("inet_ntop");

730

} else {

731

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

732

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

733

}

734

}

735

}

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

if(af == AF_INET6){

743

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

744

} else {

745

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

746

}

747

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

1197

if(af == AF_INET6){

1198

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

1199

sizeof(struct sockaddr_in6),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

} else {

1203

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

1204

sizeof(struct sockaddr_in),

1205

addrstr, sizeof(addrstr), NULL, 0,

1206

NI_NUMERICHOST);

1207

}

1208

if(ret == EAI_SYSTEM){

1209

perror_plus("getnameinfo");

1210

} else if(ret != 0) {

1211

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

1212

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

1213

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

1214

}

1215

}

1216

1217

if(quit_now){

1218

errno = EINTR;

1219

goto mandos_end;

1220

}

1221

1222

while(true){

1223

if(af == AF_INET6){

1224

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

1225

sizeof(struct sockaddr_in6));

1226

} else {

1227

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

1228

sizeof(struct sockaddr_in));

1229

}

1230

if(ret < 0){

1231

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1232

and if_index != AVAHI_IF_UNSPEC

1233

and connect_to == NULL

1234

and not route_added and

1235

((af == AF_INET6 and not

1236

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1237

&to)->sin6_addr)))

1238

or (af == AF_INET and

1239

/* Not a a IPv4LL address */

1240

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1241

& 0xFFFF0000L) != 0xA9FE0000L))){

1242

/* Work around Avahi bug - Avahi does not announce link-local

1243

addresses if it has a global address, so local hosts with

1244

*only* a link-local address (e.g. Mandos clients) cannot

1245

connect to a Mandos server announced by Avahi on a server

1246

host with a global address. Work around this by retrying

1247

with an explicit route added with the server's address.

1248

1249

Avahi bug reference:

1250

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1251

https://bugs.debian.org/587961

1252

*/

1253

if(debug){

1254

fprintf_plus(stderr, "Mandos server unreachable, trying"

1255

" direct route\n");

1256

}

1257

int e = errno;

1258

route_added = add_local_route(ip, if_index);

1259

if(route_added){

1260

continue;

1261

}

1262

errno = e;

1263

}

1264

if(errno != ECONNREFUSED or debug){

1265

int e = errno;

1266

perror_plus("connect");

1267

errno = e;

1268

}

1269

goto mandos_end;

1270

}

1271

1272

if(quit_now){

1273

errno = EINTR;

1274

goto mandos_end;

1275

}

1276

break;

759

1277

}

760

1278

761

1279

const char *out = mandos_protocol_version;

763

1281

while(true){

764

1282

size_t out_size = strlen(out);

765

1283

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

766

out_size - written));

1284

out_size - written));

767

1285

if(ret == -1){

768

1286

int e = errno;

769

1287

perror_plus("write");

789

1307

}

790

1308

791

1309

if(debug){

792

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

1310

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

793

1311

}

794

1312

795

1313

if(quit_now){

796

1314

errno = EINTR;

797

1315

goto mandos_end;

798

1316

}

799

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1317

1318

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

1319

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

1320

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

1321

gnutls_transport_set_ptr(session,

1322

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

1323

803

1324

if(quit_now){

804

1325

errno = EINTR;

815

1336

816

1337

if(ret != GNUTLS_E_SUCCESS){

817

1338

if(debug){

818

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

1339

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

819

1340

gnutls_perror(ret);

820

1341

}

821

1342

errno = EPROTO;

825

1346

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

826

1347

827

1348

if(debug){

828

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

829

ip);

1349

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1350

" %s\n", ip);

830

1351

}

831

1352

832

1353

while(true){

837

1358

}

838

1359

839

1360

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

1361

buffer_capacity);

841

1362

if(buffer_capacity == 0){

842

1363

int e = errno;

843

1364

perror_plus("incbuffer");

870

1391

}

871

1392

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

872

1393

if(ret < 0){

873

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

1394

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

1395

"***\n");

874

1396

gnutls_perror(ret);

875

1397

errno = EPROTO;

876

1398

goto mandos_end;

877

1399

}

878

1400

break;

879

1401

default:

880

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

881

" encrypted session with Mandos server\n");

1402

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

1403

" encrypted session with Mandos server\n");

882

1404

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

1405

errno = EIO;

884

1406

goto mandos_end;

889

1411

}

890

1412

891

1413

if(debug){

892

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

1414

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

893

1415

}

894

1416

895

1417

if(quit_now){

907

1429

908

1430

if(buffer_length > 0){

909

1431

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

1432

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1433

&decrypted_buffer, mc);

913

1434

if(decrypted_buffer_size >= 0){

914

1435

1436

clearerr(stdout);

915

1437

written = 0;

916

1438

while(written < (size_t) decrypted_buffer_size){

917

1439

if(quit_now){

925

1447

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

926

1448

int e = errno;

927

1449

if(debug){

928

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

929

strerror(errno));

1450

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

1451

strerror(errno));

930

1452

}

931

1453

errno = e;

932

1454

goto mandos_end;

933

1455

}

934

1456

written += (size_t)ret;

935

1457

}

1458

ret = fflush(stdout);

1459

if(ret != 0){

1460

int e = errno;

1461

if(debug){

1462

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

1463

strerror(errno));

1464

}

1465

errno = e;

1466

goto mandos_end;

1467

}

936

1468

retval = 0;

937

1469

}

938

1470

}

941

1473

942

1474

mandos_end:

943

1475

{

1476

if(route_added){

1477

if(not delete_local_route(ip, if_index)){

1478

fprintf_plus(stderr, "Failed to delete local route to %s on"

1479

" interface %d", ip, if_index);

1480

}

1481

}

944

1482

int e = errno;

945

1483

free(decrypted_buffer);

946

1484

free(buffer);

947

1485

if(tcp_sd >= 0){

948

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

1486

ret = close(tcp_sd);

949

1487

}

950

1488

if(ret == -1){

951

1489

if(e == 0){

976

1514

AVAHI_GCC_UNUSED AvahiStringList *txt,

977

1515

AVAHI_GCC_UNUSED AvahiLookupResultFlags

978

1516

flags,

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1517

void *mc){

1518

if(r == NULL){

1519

return;

1520

}

981

1521

982

1522

/* Called whenever a service has been resolved successfully or

983

1523

timed out */

984

1524

985

1525

if(quit_now){

1526

avahi_s_service_resolver_free(r);

986

1527

return;

987

1528

}

988

1529

989

1530

switch(event){

990

1531

default:

991

1532

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1533

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

1534

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

1535

domain,

1536

avahi_strerror(avahi_server_errno

1537

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

995

1538

break;

996

1539

997

1540

case AVAHI_RESOLVER_FOUND:

999

1542

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1543

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

1001

1544

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1545

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

1546

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

1547

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

1005

1548

}

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1549

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

1550

interface,

1551

avahi_proto_to_af(proto),

1552

mc);

1008

1553

if(ret == 0){

1009

avahi_simple_poll_quit(mc.simple_poll);

1554

avahi_simple_poll_quit(simple_poll);

1010

1555

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1556

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

1557

avahi_proto_to_af(proto),

1558

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

1559

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

1560

" list\n", name);

1561

}

1013

1562

}

1014

1563

}

1015

1564

}

1025

1574

const char *domain,

1026

1575

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1027

1576

flags,

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1577

void *mc){

1578

if(b == NULL){

1579

return;

1580

}

1030

1581

1031

1582

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

1032

1583

is removed from the LAN */

1039

1590

default:

1040

1591

case AVAHI_BROWSER_FAILURE:

1041

1592

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1593

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

1594

avahi_strerror(avahi_server_errno

1595

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

1596

avahi_simple_poll_quit(simple_poll);

1045

1597

return;

1046

1598

1047

1599

case AVAHI_BROWSER_NEW:

1050

1602

the callback function is called the Avahi server will free the

1051

1603

resolver for us. */

1052

1604

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

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

1057

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

1605

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

1606

interface, protocol, name, type,

1607

domain, protocol, 0,

1608

resolve_callback, mc) == NULL)

1609

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

1610

" %s\n", name,

1611

avahi_strerror(avahi_server_errno

1612

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

1058

1613

break;

1059

1614

1060

1615

case AVAHI_BROWSER_REMOVE:

1063

1618

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1619

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1620

if(debug){

1066

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

1621

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

1622

" searching...\n");

1067

1623

}

1068

1624

break;

1069

1625

}

1070

1626

}

1071

1627

1072

/* Signal handler that stops main loop after sigterm has been called */

1628

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

1073

1629

static void handle_sigterm(int sig){

1074

1630

if(quit_now){

1075

1631

return;

1078

1634

signal_received = sig;

1079

1635

int old_errno = errno;

1080

1636

/* set main loop to exit */

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1637

if(simple_poll != NULL){

1638

avahi_simple_poll_quit(simple_poll);

1083

1639

}

1084

1640

errno = old_errno;

1085

1641

}

1086

1642

1643

__attribute__((nonnull, warn_unused_result))

1644

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

1645

int ret;

1646

int old_errno;

1647

1648

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

1649

if(s < 0){

1650

old_errno = errno;

1651

perror_plus("socket");

1652

errno = old_errno;

1653

return false;

1654

}

1655

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1656

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1657

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1658

if(ret == -1){

1659

if(debug){

1660

old_errno = errno;

1661

perror_plus("ioctl SIOCGIFFLAGS");

1662

errno = old_errno;

1663

}

1664

if((close(s) == -1) and debug){

1665

old_errno = errno;

1666

perror_plus("close");

1667

errno = old_errno;

1668

}

1669

return false;

1670

}

1671

if((close(s) == -1) and debug){

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1676

return true;

1677

}

1678

1679

__attribute__((nonnull, warn_unused_result))

1680

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

1681

1682

/* Reject the loopback device */

1683

if(ifr->ifr_flags & IFF_LOOPBACK){

1684

if(debug){

1685

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

1686

ifname);

1687

}

1688

return false;

1689

}

1690

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

1691

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

1692

if(debug){

1693

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

1694

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

1695

}

1696

return true;

1697

}

1698

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

1699

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

1700

if(debug){

1701

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1702

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

1703

}

1704

return false;

1705

}

1706

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

1707

if(ifr->ifr_flags & IFF_NOARP){

1708

if(debug){

1709

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

1710

ifname);

1711

}

1712

return false;

1713

}

1714

1715

/* Accept this device */

1716

if(debug){

1717

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

1718

}

1719

return true;

1720

}

1721

1087

1722

/*

1088

1723

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

1089

1724

* corresponds to an acceptable network device.

1090

1725

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

1091

1726

*/

1727

__attribute__((nonnull, warn_unused_result))

1092

1728

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1729

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

1096

1730

return 0;

1097

1731

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1732

1733

struct ifreq ifr;

1734

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

1735

if(debug){

1736

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

1737

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

1738

}

1739

return 0;

1740

}

1741

1742

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

1743

return 0;

1188

1744

}

1189

1745

return 1;

1190

1746

}

1191

1747

1748

/*

1749

* This function determines if a network interface is up.

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_up(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

/*

1766

* This function determines if a network interface is running

1767

*/

1768

__attribute__((nonnull, warn_unused_result))

1769

bool interface_is_running(const char *interface){

1770

struct ifreq ifr;

1771

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

1772

if(debug){

1773

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

1774

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

1775

}

1776

return false;

1777

}

1778

1779

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

1780

}

1781

1782

__attribute__((nonnull, pure, warn_unused_result))

1192

1783

int notdotentries(const struct dirent *direntry){

1193

1784

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

1194

1785

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

1200

1791

return 1;

1201

1792

}

1202

1793

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1794

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

1795

__attribute__((nonnull, warn_unused_result))

1796

int runnable_hook(const struct dirent *direntry){

1797

int ret;

1798

size_t sret;

1799

struct stat st;

1800

1801

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

1802

/* Empty name? */

1803

return 0;

1804

}

1805

1806

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

1807

"abcdefghijklmnopqrstuvwxyz"

1808

"0123456789"

1809

"_.-");

1810

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

1811

/* Contains non-allowed characters */

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 0;

1817

}

1818

1819

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1820

if(ret == -1){

1821

if(debug){

1822

perror_plus("Could not stat hook");

1823

}

1824

return 0;

1825

}

1826

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

1827

/* Not a regular file */

1828

if(debug){

1829

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

1830

direntry->d_name);

1831

}

1832

return 0;

1833

}

1834

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

1835

/* Not executable */

1836

if(debug){

1837

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

1838

direntry->d_name);

1839

}

1840

return 0;

1841

}

1842

if(debug){

1843

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

1844

direntry->d_name);

1845

}

1846

return 1;

1847

}

1848

1849

__attribute__((nonnull, warn_unused_result))

1850

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1851

mandos_context *mc){

1204

1852

int ret;

1205

1853

struct timespec now;

1206

1854

struct timespec waited_time;

1207

1855

intmax_t block_time;

1208

1856

1209

1857

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1858

if(mc->current_server == NULL){

1859

if(debug){

1860

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

1861

" No timeout!\n");

1213

1862

}

1214

1863

ret = avahi_simple_poll_iterate(s, -1);

1215

1864

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1865

if(debug){

1866

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

1867

" it, or wait\n");

1218

1868

}

1219

1869

/* the current time */

1220

1870

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1874

}

1225

1875

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

1226

1876

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1877

waited_time.tv_sec = (now.tv_sec

1878

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

1879

waited_time.tv_nsec = (now.tv_nsec

1880

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

1881

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

1882

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

1883

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

1884

block_time = ((retry_interval

1885

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

1886

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

1887

1888

if(debug){

1889

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

1890

block_time);

1234

1891

}

1235

1892

1236

1893

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1894

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

1895

mc->current_server->port,

1896

mc->current_server->if_index,

1897

mc->current_server->af, mc);

1241

1898

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1899

avahi_simple_poll_quit(s);

1243

1900

return 0;

1244

1901

}

1245

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

1902

ret = clock_gettime(CLOCK_MONOTONIC,

1903

&mc->current_server->last_seen);

1246

1904

if(ret == -1){

1247

1905

perror_plus("clock_gettime");

1248

1906

return -1;

1249

1907

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1908

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

1909

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

1910

servers, but don't block */

1252

1911

}

1253

1912

1254

1913

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

1255

1914

}

1256

1915

if(ret != 0){

1257

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

1916

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

1258

1917

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

1259

1918

}

1260

1919

}

1261

1920

}

1262

1921

}

1263

1922

1923

__attribute__((nonnull))

1924

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

1925

const float delay){

1926

struct dirent **direntries = NULL;

1927

if(hookdir_fd == -1){

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1930

if(hookdir_fd == -1){

1931

if(errno == ENOENT){

1932

if(debug){

1933

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

1934

" found\n", hookdir);

1935

}

1936

} else {

1937

perror_plus("open");

1938

}

1939

return;

1940

}

1941

}

1942

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

1943

if(devnull == -1){

1944

perror_plus("open(\"/dev/null\", O_RDONLY)");

1945

return;

1946

}

1947

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1948

runnable_hook, alphasort);

1949

if(numhooks == -1){

1950

perror_plus("scandir");

1951

close(devnull);

1952

return;

1953

}

1954

struct dirent *direntry;

1955

int ret;

1956

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

1957

direntry = direntries[i];

1958

if(debug){

1959

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

1960

direntry->d_name);

1961

}

1962

pid_t hook_pid = fork();

1963

if(hook_pid == 0){

1964

/* Child */

1965

/* Raise privileges */

1966

errno = raise_privileges_permanently();

1967

if(errno != 0){

1968

perror_plus("Failed to raise privileges");

1969

_exit(EX_NOPERM);

1970

}

1971

/* Set group */

1972

errno = 0;

1973

ret = setgid(0);

1974

if(ret == -1){

1975

perror_plus("setgid");

1976

_exit(EX_NOPERM);

1977

}

1978

/* Reset supplementary groups */

1979

errno = 0;

1980

ret = setgroups(0, NULL);

1981

if(ret == -1){

1982

perror_plus("setgroups");

1983

_exit(EX_NOPERM);

1984

}

1985

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

1986

if(ret == -1){

1987

perror_plus("setenv");

1988

_exit(EX_OSERR);

1989

}

1990

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

1991

if(ret == -1){

1992

perror_plus("setenv");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

char *delaystring;

2006

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

2007

if(ret == -1){

2008

perror_plus("asprintf");

2009

_exit(EX_OSERR);

2010

}

2011

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

2012

if(ret == -1){

2013

free(delaystring);

2014

perror_plus("setenv");

2015

_exit(EX_OSERR);

2016

}

2017

free(delaystring);

2018

if(connect_to != NULL){

2019

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

2020

if(ret == -1){

2021

perror_plus("setenv");

2022

_exit(EX_OSERR);

2023

}

2024

}

2025

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2026

direntry->d_name,

2027

O_RDONLY));

2028

if(hook_fd == -1){

2029

perror_plus("openat");

2030

_exit(EXIT_FAILURE);

2031

}

2032

if(close(hookdir_fd) == -1){

2033

perror_plus("close");

2034

_exit(EXIT_FAILURE);

2035

}

2036

ret = dup2(devnull, STDIN_FILENO);

2037

if(ret == -1){

2038

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

2039

_exit(EX_OSERR);

2040

}

2041

ret = close(devnull);

2042

if(ret == -1){

2043

perror_plus("close");

2044

_exit(EX_OSERR);

2045

}

2046

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2047

if(ret == -1){

2048

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

2049

_exit(EX_OSERR);

2050

}

2051

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2052

environ) == -1){

2053

perror_plus("fexecve");

2054

_exit(EXIT_FAILURE);

2055

}

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

2062

int status;

2063

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

2064

perror_plus("waitpid");

2065

free(direntry);

2066

continue;

2067

}

2068

if(WIFEXITED(status)){

2069

if(WEXITSTATUS(status) != 0){

2070

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

2071

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

2072

WEXITSTATUS(status));

2073

free(direntry);

2074

continue;

2075

}

2076

} else if(WIFSIGNALED(status)){

2077

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

2078

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

2079

WTERMSIG(status));

2080

free(direntry);

2081

continue;

2082

} else {

2083

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

2084

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

2085

free(direntry);

2086

continue;

2087

}

2088

}

2089

if(debug){

2090

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

2091

direntry->d_name);

2092

}

2093

free(direntry);

2094

}

2095

free(direntries);

2096

if(close(hookdir_fd) == -1){

2097

perror_plus("close");

2098

} else {

2099

hookdir_fd = -1;

2100

}

2101

close(devnull);

2102

}

2103

2104

__attribute__((nonnull, warn_unused_result))

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

2108

int ret;

2109

struct ifreq network;

2110

unsigned int if_index = if_nametoindex(interface);

2111

if(if_index == 0){

2112

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

2113

errno = old_errno;

2114

return ENXIO;

2115

}

2116

2117

if(quit_now){

2118

errno = old_errno;

2119

return EINTR;

2120

}

2121

2122

if(not interface_is_up(interface)){

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

2125

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

2126

ret_errno = errno;

2127

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

2128

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

2129

errno = old_errno;

2130

return ret_errno;

2131

}

2132

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

2133

2134

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

2135

if(sd == -1){

2136

ret_errno = errno;

2137

perror_plus("socket");

2138

errno = old_errno;

2139

return ret_errno;

2140

}

2141

2142

if(quit_now){

2143

ret = close(sd);

2144

if(ret == -1){

2145

perror_plus("close");

2146

}

2147

errno = old_errno;

2148

return EINTR;

2149

}

2150

2151

if(debug){

2152

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

2153

interface);

2154

}

2155

2156

/* Raise privileges */

2157

ret_errno = raise_privileges();

2158

if(ret_errno != 0){

2159

errno = ret_errno;

2160

perror_plus("Failed to raise privileges");

2161

}

2162

2163

#ifdef __linux__

2164

int ret_linux;

2165

bool restore_loglevel = false;

2166

if(ret_errno == 0){

2167

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2168

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

2169

ret_linux = klogctl(8, NULL, 5);

2170

if(ret_linux == -1){

2171

perror_plus("klogctl");

2172

} else {

2173

restore_loglevel = true;

2174

}

2175

}

2176

#endif /* __linux__ */

2177

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

2178

ioctl_errno = errno;

2179

#ifdef __linux__

2180

if(restore_loglevel){

2181

ret_linux = klogctl(7, NULL, 0);

2182

if(ret_linux == -1){

2183

perror_plus("klogctl");

2184

}

2185

}

2186

#endif /* __linux__ */

2187

2188

/* If raise_privileges() succeeded above */

2189

if(ret_errno == 0){

2190

/* Lower privileges */

2191

ret_errno = lower_privileges();

2192

if(ret_errno != 0){

2193

errno = ret_errno;

2194

perror_plus("Failed to lower privileges");

2195

}

2196

}

2197

2198

/* Close the socket */

2199

ret = close(sd);

2200

if(ret == -1){

2201

perror_plus("close");

2202

}

2203

2204

if(ret_setflags == -1){

2205

errno = ioctl_errno;

2206

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2207

errno = old_errno;

2208

return ioctl_errno;

2209

}

2210

} else if(debug){

2211

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

2212

interface);

2213

}

2214

2215

/* Sleep checking until interface is running.

2216

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

2217

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

2218

if(interface_is_running(interface)){

2219

break;

2220

}

2221

struct timespec sleeptime = { .tv_nsec = 250000000 };

2222

ret = nanosleep(&sleeptime, NULL);

2223

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

2224

perror_plus("nanosleep");

2225

}

2226

}

2227

2228

errno = old_errno;

2229

return 0;

2230

}

2231

2232

__attribute__((nonnull, warn_unused_result))

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

2235

struct ifreq network;

2236

unsigned int if_index = if_nametoindex(interface);

2237

if(if_index == 0){

2238

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

2239

errno = old_errno;

2240

return ENXIO;

2241

}

2242

if(interface_is_up(interface)){

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

2245

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

2246

ret_errno = errno;

2247

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

2248

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

2249

errno = old_errno;

2250

return ret_errno;

2251

}

2252

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

2253

2254

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

2255

if(sd == -1){

2256

ret_errno = errno;

2257

perror_plus("socket");

2258

errno = old_errno;

2259

return ret_errno;

2260

}

2261

2262

if(debug){

2263

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

2264

interface);

2265

}

2266

2267

/* Raise privileges */

2268

ret_errno = raise_privileges();

2269

if(ret_errno != 0){

2270

errno = ret_errno;

2271

perror_plus("Failed to raise privileges");

2272

}

2273

2274

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

2275

ioctl_errno = errno;

2276

2277

/* If raise_privileges() succeeded above */

2278

if(ret_errno == 0){

2279

/* Lower privileges */

2280

ret_errno = lower_privileges();

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("Failed to lower privileges");

2284

}

2285

}

2286

2287

/* Close the socket */

2288

int ret = close(sd);

2289

if(ret == -1){

2290

perror_plus("close");

2291

}

2292

2293

if(ret_setflags == -1){

2294

errno = ioctl_errno;

2295

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2296

errno = old_errno;

2297

return ioctl_errno;

2298

}

2299

} else if(debug){

2300

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

2301

interface);

2302

}

2303

2304

errno = old_errno;

2305

return 0;

2306

}

2307

1264

2308

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

2309

mandos_context mc = { .server = NULL, .dh_bits = 0,

2310

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

2311

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

1265

2314

AvahiSServiceBrowser *sb = NULL;

1266

int error;

2315

error_t ret_errno;

1267

2316

int ret;

1268

2317

intmax_t tmpmax;

1269

2318

char *tmp;

1270

2319

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

1272

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

1275

uid_t uid;

1276

gid_t gid;

1277

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

1278

bool tempdir_created = false;

2320

char *interfaces_to_take_down = NULL;

2321

size_t interfaces_to_take_down_size = 0;

2322

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

2323

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

2324

char *tempdir = NULL;

1279

2325

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1280

2326

const char *seckey = PATHDIR "/" SECKEY;

1281

2327

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

2329

char *interfaces_hooks = NULL;

1282

2330

1283

2331

bool gnutls_initialized = false;

1284

2332

bool gpgme_initialized = false;

1285

2333

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

2334

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

2335

retrying the same server again */

1287

2336

1288

2337

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

2338

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1335

2384

.doc = "Bit length of the prime number used in the"

1336

2385

" Diffie-Hellman key exchange",

1337

2386

.group = 2 },

2387

{ .name = "dh-params", .key = 134,

2388

.arg = "FILE",

2389

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2390

" for the Diffie-Hellman key exchange",

2391

.group = 2 },

1338

2392

{ .name = "priority", .key = 130,

1339

2393

.arg = "STRING",

1340

2394

.doc = "GnuTLS priority string for the TLS handshake",

1345

2399

.group = 2 },

1346

2400

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

1347

2401

.arg = "SECONDS",

1348

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

2402

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

2403

.group = 2 },

2404

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

2405

.arg = "DIR",

2406

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

1349

2407

.group = 2 },

1350

2408

/*

1351

2409

* These reproduce what we would get without ARGP_NO_HELP

1370

2428

connect_to = arg;

1371

2429

break;

1372

2430

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

1373

interface = arg;

2431

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

2432

arg, (int)',');

2433

if(ret_errno != 0){

2434

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

2435

}

1374

2436

break;

1375

2437

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

1376

2438

seckey = arg;

1387

2449

}

1388

2450

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

1389

2451

break;

2452

case 134: /* --dh-params */

2453

dh_params_file = arg;

2454

break;

1390

2455

case 130: /* --priority */

1391

2456

mc.priority = arg;

1392

2457

break;

1400

2465

errno = 0;

1401

2466

retry_interval = strtod(arg, &tmp);

1402

2467

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

1403

or (retry_interval * 1000) > INT_MAX){

2468

or (retry_interval * 1000) > INT_MAX

2469

or retry_interval < 0){

1404

2470

argp_error(state, "Bad retry interval");

1405

2471

}

1406

2472

break;

2473

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

2474

hookdir = arg;

2475

break;

1407

2476

/*

1408

2477

* These reproduce what we would get without ARGP_NO_HELP

1409

2478

*/

1415

2484

argp_state_help(state, state->out_stream,

1416

2485

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

2486

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

1418

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

2487

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

1419

2488

exit(argp_err_exit_status);

1420

2489

break;

1421

2490

default:

1428

2497

.args_doc = "",

1429

2498

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

1430

2499

" passwords from a Mandos server" };

1431

ret = argp_parse(&argp, argc, argv,

1432

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1433

switch(ret){

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

1434

2503

case 0:

1435

2504

break;

1436

2505

case ENOMEM:

1437

2506

default:

1438

errno = ret;

2507

errno = ret_errno;

1439

2508

perror_plus("argp_parse");

1440

2509

exitcode = EX_OSERR;

1441

2510

goto end;

1445

2514

}

1446

2515

}

1447

2516

2517

{

2518

/* Work around Debian bug #633582:

2519

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

2520

2521

/* Re-raise privileges */

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2525

perror_plus("Failed to raise privileges");

2526

} else {

2527

struct stat st;

2528

2529

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

2530

int seckey_fd = open(seckey, O_RDONLY);

2531

if(seckey_fd == -1){

2532

perror_plus("open");

2533

} else {

2534

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

2535

if(ret == -1){

2536

perror_plus("fstat");

2537

} else {

2538

if(S_ISREG(st.st_mode)

2539

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

2540

ret = fchown(seckey_fd, uid, gid);

2541

if(ret == -1){

2542

perror_plus("fchown");

2543

}

2544

}

2545

}

2546

close(seckey_fd);

2547

}

2548

}

2549

2550

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

2551

int pubkey_fd = open(pubkey, O_RDONLY);

2552

if(pubkey_fd == -1){

2553

perror_plus("open");

2554

} else {

2555

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

2556

if(ret == -1){

2557

perror_plus("fstat");

2558

} else {

2559

if(S_ISREG(st.st_mode)

2560

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

2561

ret = fchown(pubkey_fd, uid, gid);

2562

if(ret == -1){

2563

perror_plus("fchown");

2564

}

2565

}

2566

}

2567

close(pubkey_fd);

2568

}

2569

}

2570

2571

if(dh_params_file != NULL

2572

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2573

int dhparams_fd = open(dh_params_file, O_RDONLY);

2574

if(dhparams_fd == -1){

2575

perror_plus("open");

2576

} else {

2577

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

2578

if(ret == -1){

2579

perror_plus("fstat");

2580

} else {

2581

if(S_ISREG(st.st_mode)

2582

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

2583

ret = fchown(dhparams_fd, uid, gid);

2584

if(ret == -1){

2585

perror_plus("fchown");

2586

}

2587

}

2588

}

2589

close(dhparams_fd);

2590

}

2591

}

2592

2593

/* Lower privileges */

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2597

perror_plus("Failed to lower privileges");

2598

}

2599

}

2600

}

2601

2602

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

2603

{

2604

char *interface = NULL;

2605

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

2606

interface))){

2607

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

2608

and if_nametoindex(interface) == 0){

2609

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

2610

fprintf_plus(stderr, "Not using nonexisting interface"

2611

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

2612

}

2613

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

2614

interface = NULL;

2615

}

2616

}

2617

}

2618

2619

/* Run network hooks */

2620

{

2621

if(mc.interfaces != NULL){

2622

interfaces_hooks = malloc(mc.interfaces_size);

2623

if(interfaces_hooks == NULL){

2624

perror_plus("malloc");

2625

goto end;

2626

}

2627

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

2628

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

2629

}

2630

run_network_hooks("start", interfaces_hooks != NULL ?

2631

interfaces_hooks : "", delay);

2632

}

2633

1448

2634

if(not debug){

1449

2635

avahi_set_log_function(empty_log);

1450

2636

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

2637

1477

2638

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

1478

2639

from the signal handler */

1479

2640

/* Initialize the pseudo-RNG for Avahi */

1480

2641

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

1481

mc.simple_poll = avahi_simple_poll_new();

1482

if(mc.simple_poll == NULL){

1483

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

2642

simple_poll = avahi_simple_poll_new();

2643

if(simple_poll == NULL){

2644

fprintf_plus(stderr,

2645

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

1484

2646

exitcode = EX_UNAVAILABLE;

1485

2647

goto end;

1486

2648

}

1548

2710

}

1549

2711

}

1550

2712

1551

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1571

#ifdef __linux__

1572

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1574

ret = klogctl(8, NULL, 5);

1575

bool restore_loglevel = true;

1576

if(ret == -1){

1577

restore_loglevel = false;

1578

perror_plus("klogctl");

1579

}

1580

#endif /* __linux__ */

1581

1582

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1586

#ifdef __linux__

1587

if(restore_loglevel){

1588

ret = klogctl(7, NULL, 0);

1589

if(ret == -1){

1590

perror_plus("klogctl");

1591

}

1592

}

1593

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

goto end;

1601

}

1602

strcpy(network.ifr_name, interface);

1603

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

1604

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1606

#ifdef __linux__

1607

if(restore_loglevel){

1608

ret = klogctl(7, NULL, 0);

1609

if(ret == -1){

1610

perror_plus("klogctl");

1611

}

1612

}

1613

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1621

goto end;

1622

}

1623

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

1624

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

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

1627

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1631

#ifdef __linux__

1632

if(restore_loglevel){

1633

ret = klogctl(7, NULL, 0);

1634

if(ret == -1){

1635

perror_plus("klogctl");

2713

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

2714

if(mc.interfaces == NULL){

2715

struct dirent **direntries = NULL;

2716

/* Look for any good interfaces */

2717

ret = scandir(sys_class_net, &direntries, good_interface,

2718

alphasort);

2719

if(ret >= 1){

2720

/* Add all found interfaces to interfaces list */

2721

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

2722

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

2723

direntries[i]->d_name);

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("argz_add");

2727

free(direntries[i]);

2728

continue;

2729

}

2730

if(debug){

2731

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

2732

direntries[i]->d_name);

2733

}

2734

free(direntries[i]);

2735

}

2736

free(direntries);

2737

} else {

2738

if(ret == 0){

2739

free(direntries);

2740

}

2741

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

2742

exitcode = EXIT_FAILURE;

2743

goto end;

2744

}

2745

}

2746

2747

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

2748

{

2749

char *interface = NULL;

2750

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

2751

interface))){

2752

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

2753

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

2754

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

2755

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

2756

interface);

2757

interface = NULL;

2758

while((interface = argz_next(mc.interfaces,

2759

mc.interfaces_size, interface))){

2760

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

2761

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

2762

interface);

2763

interface = NULL;

1636

2764

}

1637

2765

}

1638

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

goto end;

1646

}

1647

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1649

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

1650

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

1651

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_RUNNING){

1654

2766

break;

1655

2767

}

1656

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

ret = nanosleep(&sleeptime, NULL);

1658

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

1659

perror_plus("nanosleep");

1660

}

1661

}

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1692

}

2768

bool interface_was_up = interface_is_up(interface);

2769

errno = bring_up_interface(interface, delay);

2770

if(not interface_was_up){

2771

if(errno != 0){

2772

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2773

" %s\n", interface, strerror(errno));

2774

} else {

2775

errno = argz_add(&interfaces_to_take_down,

2776

&interfaces_to_take_down_size,

2777

interface);

2778

if(errno != 0){

2779

perror_plus("argz_add");

2780

}

2781

}

2782

}

2783

}

2784

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

2785

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

2786

}

2787

}

2788

2789

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

2790

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

2791

if(debug){

2792

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

2793

mc.interfaces);

2794

}

2795

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

1693

2796

}

1694

2797

1695

2798

if(quit_now){

1696

2799

goto end;

1697

2800

}

1698

2801

1699

ret = init_gnutls_global(pubkey, seckey);

2802

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

1700

2803

if(ret == -1){

1701

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

2804

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

1702

2805

exitcode = EX_UNAVAILABLE;

1703

2806

goto end;

1704

2807

} else {

1709

2812

goto end;

1710

2813

}

1711

2814

1712

if(mkdtemp(tempdir) == NULL){

2815

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

2816

tempdir = mkdtemp(run_tempdir);

2817

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

2818

if(debug){

2819

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

2820

run_tempdir, old_tempdir);

2821

}

2822

tempdir = mkdtemp(old_tempdir);

2823

}

2824

if(tempdir == NULL){

1713

2825

perror_plus("mkdtemp");

1714

2826

goto end;

1715

2827

}

1716

tempdir_created = true;

1717

2828

1718

2829

if(quit_now){

1719

2830

goto end;

1720

2831

}

1721

2832

1722

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

1723

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

2833

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

2834

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

1724

2835

exitcode = EX_UNAVAILABLE;

1725

2836

goto end;

1726

2837

} else {

1735

2846

/* Connect directly, do not use Zeroconf */

1736

2847

/* (Mainly meant for debugging) */

1737

2848

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

2849

1738

2850

if(address == NULL){

1739

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

2851

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

1740

2852

exitcode = EX_USAGE;

1741

2853

goto end;

1742

2854

}

1745

2857

goto end;

1746

2858

}

1747

2859

1748

uint16_t port;

2860

in_port_t port;

1749

2861

errno = 0;

1750

2862

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

1751

2863

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

1752

or tmpmax != (uint16_t)tmpmax){

1753

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

2864

or tmpmax != (in_port_t)tmpmax){

2865

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

1754

2866

exitcode = EX_USAGE;

1755

2867

goto end;

1756

2868

}

1757

2869

1758

2870

if(quit_now){

1759

2871

goto end;

1760

2872

}

1761

2873

1762

port = (uint16_t)tmpmax;

2874

port = (in_port_t)tmpmax;

1763

2875

*address = '\0';

1764

address = connect_to;

1765

2876

/* Colon in address indicates IPv6 */

1766

2877

int af;

1767

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

2878

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

1768

2879

af = AF_INET6;

2880

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

2881

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

2882

{

2883

connect_to++;

2884

address[-1] = '\0';

2885

}

1769

2886

} else {

1770

2887

af = AF_INET;

1771

2888

}

2889

address = connect_to;

1772

2890

1773

2891

if(quit_now){

1774

2892

goto end;

1775

2893

}

1776

2894

1777

2895

while(not quit_now){

1778

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

2896

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

2897

&mc);

1779

2898

if(quit_now or ret == 0){

1780

2899

break;

1781

2900

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

2901

if(debug){

2902

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

2903

(int)retry_interval);

2904

}

2905

sleep((unsigned int)retry_interval);

2906

}

2907

2908

if(not quit_now){

1786

2909

exitcode = EXIT_SUCCESS;

1787

2910

}

1788

2911

1789

2912

goto end;

1790

2913

}

1791

2914

1803

2926

config.publish_domain = 0;

1804

2927

1805

2928

/* Allocate a new server */

1806

mc.server = avahi_server_new(avahi_simple_poll_get

1807

(mc.simple_poll), &config, NULL,

1808

NULL, &error);

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2930

&config, NULL, NULL, &ret);

1809

2931

1810

2932

/* Free the Avahi configuration data */

1811

2933

avahi_server_config_free(&config);

1813

2935

1814

2936

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

1815

2937

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2938

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

2939

avahi_strerror(ret));

1818

2940

exitcode = EX_UNAVAILABLE;

1819

2941

goto end;

1820

2942

}

1826

2948

/* Create the Avahi service browser */

1827

2949

sb = avahi_s_service_browser_new(mc.server, if_index,

1828

2950

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

NULL, 0, browse_callback, NULL);

2951

NULL, 0, browse_callback,

2952

(void *)&mc);

1830

2953

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2954

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

2955

avahi_strerror(avahi_server_errno(mc.server)));

1833

2956

exitcode = EX_UNAVAILABLE;

1834

2957

goto end;

1835

2958

}

1841

2964

/* Run the main loop */

1842

2965

1843

2966

if(debug){

1844

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

2967

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

1845

2968

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2969

2970

ret = avahi_loop_with_timeout(simple_poll,

2971

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

1848

2972

if(debug){

1849

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

1850

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

2973

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

2974

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

1851

2975

}

1852

2976

1853

2977

end:

1854

2978

1855

2979

if(debug){

1856

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

2980

if(signal_received){

2981

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2982

argv[0], signal_received,

2983

strsignal(signal_received));

2984

} else {

2985

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

2986

}

1857

2987

}

1858

2988

1859

2989

/* Cleanup things */

2990

free(mc.interfaces);

2991

1860

2992

if(sb != NULL)

1861

2993

avahi_s_service_browser_free(sb);

1862

2994

1863

2995

if(mc.server != NULL)

1864

2996

avahi_server_free(mc.server);

1865

2997

1866

if(mc.simple_poll != NULL)

1867

avahi_simple_poll_free(mc.simple_poll);

2998

if(simple_poll != NULL)

2999

avahi_simple_poll_free(simple_poll);

1868

3000

1869

3001

if(gnutls_initialized){

1870

3002

gnutls_certificate_free_credentials(mc.cred);

1871

gnutls_global_deinit();

1872

3003

gnutls_dh_params_deinit(mc.dh_params);

1873

3004

}

1874

3005

1875

3006

if(gpgme_initialized){

1876

3007

gpgme_release(mc.ctx);

1877

3008

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

3009

3010

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

3011

has seen */

1880

3012

if(mc.current_server != NULL){

1881

3013

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

1882

3014

while(mc.current_server != NULL){

1883

3015

server *next = mc.current_server->next;

3016

#ifdef __GNUC__

3017

#pragma GCC diagnostic push

3018

#pragma GCC diagnostic ignored "-Wcast-qual"

3019

#endif

3020

free((char *)(mc.current_server->ip));

3021

#ifdef __GNUC__

3022

#pragma GCC diagnostic pop

3023

#endif

1884

3024

free(mc.current_server);

1885

3025

mc.current_server = next;

1886

3026

}

1887

3027

}

1888

3028

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1906

}

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

}

3029

/* Re-raise privileges */

3030

{

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

3034

perror_plus("Failed to raise privileges");

3035

} else {

3036

3037

/* Run network hooks */

3038

run_network_hooks("stop", interfaces_hooks != NULL ?

3039

interfaces_hooks : "", delay);

3040

3041

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

3042

{

3043

char *interface = NULL;

3044

while((interface = argz_next(interfaces_to_take_down,

3045

interfaces_to_take_down_size,

3046

interface))){

3047

ret = take_down_interface(interface);

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to take down interface");

3051

}

3052

}

3053

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

3054

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

3055

" down\n");

3056

}

3057

}

3058

}

3059

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

3063

perror_plus("Failed to lower privileges permanently");

3064

}

3065

}

3066

3067

free(interfaces_to_take_down);

3068

free(interfaces_hooks);

3069

3070

void clean_dir_at(int base, const char * const dirname,

3071

uintmax_t level){

3072

struct dirent **direntries = NULL;

3073

int dret;

3074

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3075

O_RDONLY

3076

| O_NOFOLLOW

3077

| O_DIRECTORY

3078

| O_PATH));

3079

if(dir_fd == -1){

3080

perror_plus("open");

3081

return;

3082

}

3083

int numentries = scandirat(dir_fd, ".", &direntries,

3084

notdotentries, alphasort);

3085

if(numentries >= 0){

3086

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

3087

if(debug){

3088

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3089

dirname, direntries[i]->d_name);

3090

}

3091

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3092

if(dret == -1){

3093

if(errno == EISDIR){

3094

dret = unlinkat(dir_fd, direntries[i]->d_name,

3095

AT_REMOVEDIR);

3096

}

3097

if((dret == -1) and (errno == ENOTEMPTY)

3098

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3099

== 0) and (level == 0)){

3100

/* Recurse only in this special case */

3101

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3102

dret = 0;

3103

}

3104

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

3105

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3106

direntries[i]->d_name, strerror(errno));

3107

}

3108

}

3109

free(direntries[i]);

3110

}

3111

3112

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

3113

free(direntries);

3114

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3115

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

3116

perror_plus("rmdir");

3117

}

3118

} else {

3119

perror_plus("scandirat");

3120

}

3121

close(dir_fd);

1919

3122

}

1920

3123

1921

3124

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

1922

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1926

if (ret > 0){

1927

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

1928

direntry = direntries[i];

1929

char *fullname = NULL;

1930

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

1931

direntry->d_name);

1932

if(ret < 0){

1933

perror_plus("asprintf");

1934

continue;

1935

}

1936

ret = remove(fullname);

1937

if(ret == -1){

1938

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

1939

strerror(errno));

1940

}

1941

free(fullname);

1942

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1949

}

1950

ret = rmdir(tempdir);

1951

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

1952

perror_plus("rmdir");

1953

}

3125

if(tempdir != NULL){

3126

clean_dir_at(-1, tempdir, 0);

1954

3127

}

1955

3128

1956

3129

if(quit_now){