/mandos/release : revision 237.7.35

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

44

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

asprintf(), strncpy() */

49

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

50

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

51

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

52

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

64

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

65

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

70

66

program_invocation_short_name */

71

67

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

72

68

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

77

73

*/

78

74

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

79

75

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

80

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

81

unlinkat() */

82

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

76

setgid(), pause() */

77

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

83

78

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

84

79

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

85

80

argp_state, struct argp,

90

85

raise() */

91

86

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

92

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

93

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

94

WEXITSTATUS(), WTERMSIG() */

95

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

96

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

97

argz_delete(), argz_append(),

98

argz_stringify(), argz_add(),

99

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

102

88

103

89

#ifdef __linux__

104

90

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

122

108

init_gnutls_session(),

123

109

GNUTLS_* */

124

110

#include <gnutls/openpgp.h>

125

/* gnutls_certificate_set_openpgp_key_file(),

126

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

127

113

128

114

/* GPGME */

129

115

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

137

123

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

138

124

#define SECKEY "seckey.txt"

139

125

#define PUBKEY "pubkey.txt"

140

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

141

126

142

127

bool debug = false;

143

128

static const char mandos_protocol_version[] = "1";

144

129

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

145

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

130

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

146

131

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

147

132

char *connect_to = NULL;

148

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

150

uid_t uid = 65534;

151

gid_t gid = 65534;

152

133

153

134

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

154

135

typedef struct server{

155

136

const char *ip;

156

in_port_t port;

137

uint16_t port;

157

138

AvahiIfIndex if_index;

158

139

int af;

159

140

struct timespec last_seen;

163

144

164

145

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

165

146

typedef struct {

147

AvahiSimplePoll *simple_poll;

166

148

AvahiServer *server;

167

149

gnutls_certificate_credentials_t cred;

168

150

unsigned int dh_bits;

170

152

const char *priority;

171

153

gpgme_ctx_t ctx;

172

154

server *current_server;

173

char *interfaces;

174

size_t interfaces_size;

175

155

} mandos_context;

176

156

177

/* global so signal handler can reach it*/

178

AvahiSimplePoll *simple_poll;

157

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

158

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

159

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

179

162

180

163

sig_atomic_t quit_now = 0;

181

164

int signal_received = 0;

182

165

183

166

/* Function to use when printing errors */

184

167

void perror_plus(const char *print_text){

185

int e = errno;

186

168

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

187

169

program_invocation_short_name);

188

errno = e;

189

170

perror(print_text);

190

171

}

191

172

192

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

193

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

194

va_list ap;

195

va_start (ap, format);

196

197

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

198

program_invocation_short_name));

199

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

200

}

201

202

173

/*

203

174

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

204

175

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

205

176

* "buffer_length" is how much is already used.

206

177

*/

207

__attribute__((nonnull, warn_unused_result))

208

178

size_t incbuffer(char **buffer, size_t buffer_length,

209

size_t buffer_capacity){

179

size_t buffer_capacity){

210

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

211

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

212

if(new_buf == NULL){

213

int old_errno = errno;

214

free(*buffer);

215

errno = old_errno;

216

*buffer = NULL;

181

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

182

if(buffer == NULL){

217

183

return 0;

218

184

}

219

*buffer = new_buf;

220

185

buffer_capacity += BUFFER_SIZE;

221

186

}

222

187

return buffer_capacity;

223

188

}

224

189

225

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

226

__attribute__((nonnull, warn_unused_result))

227

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

228

int af, server **current_server){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

229

193

int ret;

230

194

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

231

195

if(new_server == NULL){

232

196

perror_plus("malloc");

233

return false;

197

return -1;

234

198

}

235

199

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

236

.port = port,

237

.if_index = if_index,

238

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

239

203

if(new_server->ip == NULL){

240

204

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

return false;

257

}

258

/* Special case of first server */

259

if(*current_server == NULL){

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

260

209

new_server->next = new_server;

261

210

new_server->prev = new_server;

262

*current_server = new_server;

211

mc.current_server = new_server;

212

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

263

213

} else {

264

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

265

new_server->next = *current_server;

266

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

214

new_server->next = mc.current_server;

215

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

267

216

new_server->prev->next = new_server;

268

(*current_server)->prev = new_server;

269

}

270

return true;

217

mc.current_server->prev = new_server;

218

}

219

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

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

271

225

}

272

226

273

227

/*

274

228

* Initialize GPGME.

275

229

*/

276

__attribute__((nonnull, warn_unused_result))

277

static bool init_gpgme(const char * const seckey,

278

const char * const pubkey,

279

const char * const tempdir,

280

mandos_context *mc){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

281

232

gpgme_error_t rc;

282

233

gpgme_engine_info_t engine_info;

283

234

235

284

236

/*

285

237

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

286

238

*/

287

bool import_key(const char * const filename){

239

bool import_key(const char *filename){

288

240

int ret;

289

241

int fd;

290

242

gpgme_data_t pgp_data;

297

249

298

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

299

251

if(rc != GPG_ERR_NO_ERROR){

300

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

301

gpgme_strsource(rc), gpgme_strerror(rc));

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

302

254

return false;

303

255

}

304

256

305

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

257

rc = gpgme_op_import(mc.ctx, pgp_data);

306

258

if(rc != GPG_ERR_NO_ERROR){

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

309

261

return false;

310

262

}

311

263

312

ret = close(fd);

264

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

313

265

if(ret == -1){

314

266

perror_plus("close");

315

267

}

318

270

}

319

271

320

272

if(debug){

321

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

273

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

322

274

}

323

275

324

276

/* Init GPGME */

325

277

gpgme_check_version(NULL);

326

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

327

279

if(rc != GPG_ERR_NO_ERROR){

328

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

329

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

330

282

return false;

331

283

}

332

284

333

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

285

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

334

286

rc = gpgme_get_engine_info(&engine_info);

335

287

if(rc != GPG_ERR_NO_ERROR){

336

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

337

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

338

290

return false;

339

291

}

340

292

while(engine_info != NULL){

346

298

engine_info = engine_info->next;

347

299

}

348

300

if(engine_info == NULL){

349

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

350

tempdir);

301

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

351

302

return false;

352

303

}

353

304

354

305

/* Create new GPGME "context" */

355

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

306

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

356

307

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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

359

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

360

310

return false;

361

311

}

362

312

371

321

* Decrypt OpenPGP data.

372

322

* Returns -1 on error

373

323

*/

374

__attribute__((nonnull, warn_unused_result))

375

324

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

325

size_t crypto_size,

377

char **plaintext,

378

mandos_context *mc){

326

char **plaintext){

379

327

gpgme_data_t dh_crypto, dh_plain;

380

328

gpgme_error_t rc;

381

329

ssize_t ret;

383

331

ssize_t plaintext_length = 0;

384

332

385

333

if(debug){

386

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

334

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

387

335

}

388

336

389

337

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

390

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

391

339

0);

392

340

if(rc != GPG_ERR_NO_ERROR){

393

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

394

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

395

343

return -1;

396

344

}

397

345

398

346

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

399

347

rc = gpgme_data_new(&dh_plain);

400

348

if(rc != GPG_ERR_NO_ERROR){

401

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

402

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

403

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

404

351

gpgme_data_release(dh_crypto);

405

352

return -1;

406

353

}

407

354

408

355

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

409

356

data buffer */

410

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

357

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

411

358

if(rc != GPG_ERR_NO_ERROR){

412

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

413

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

414

361

plaintext_length = -1;

415

362

if(debug){

416

363

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

364

result = gpgme_op_decrypt_result(mc.ctx);

418

365

if(result == NULL){

419

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

366

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

420

367

} else {

421

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

422

result->unsupported_algorithm);

423

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

424

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

425

372

if(result->file_name != NULL){

426

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

373

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

427

374

}

428

375

gpgme_recipient_t recipient;

429

376

recipient = result->recipients;

430

377

while(recipient != NULL){

431

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

432

gpgme_pubkey_algo_name

433

(recipient->pubkey_algo));

434

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

435

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

436

recipient->status == GPG_ERR_NO_SECKEY

437

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

438

384

recipient = recipient->next;

439

385

}

440

386

}

443

389

}

444

390

445

391

if(debug){

446

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

392

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

447

393

}

448

394

449

395

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

456

402

*plaintext = NULL;

457

403

while(true){

458

404

plaintext_capacity = incbuffer(plaintext,

459

(size_t)plaintext_length,

460

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

461

407

if(plaintext_capacity == 0){

462

perror_plus("incbuffer");

463

plaintext_length = -1;

464

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

465

411

}

466

412

467

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

480

426

}

481

427

482

428

if(debug){

483

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

429

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

484

430

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

485

431

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

486

432

}

497

443

return plaintext_length;

498

444

}

499

445

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

509

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

446

static const char * safer_gnutls_strerror(int value){

447

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

448

-Wunreachable-code */

449

if(ret == NULL)

450

ret = "(unknown)";

451

return ret;

511

452

}

512

453

513

454

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

455

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

516

456

const char* string){

517

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

457

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

518

458

}

519

459

520

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

521

460

static int init_gnutls_global(const char *pubkeyfilename,

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

mandos_context *mc){

461

const char *seckeyfilename){

525

462

int ret;

526

unsigned int uret;

527

463

528

464

if(debug){

529

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

465

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

466

}

467

468

ret = gnutls_global_init();

469

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

472

return -1;

530

473

}

531

474

532

475

if(debug){

538

481

}

539

482

540

483

/* OpenPGP credentials */

541

ret = gnutls_certificate_allocate_credentials(&mc->cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

542

485

if(ret != GNUTLS_E_SUCCESS){

543

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

544

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

488

gnutls_global_deinit();

545

489

return -1;

546

490

}

547

491

548

492

if(debug){

549

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

550

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

551

pubkeyfilename,

552

seckeyfilename);

493

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

494

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

495

seckeyfilename);

553

496

}

554

497

555

498

ret = gnutls_certificate_set_openpgp_key_file

556

(mc->cred, pubkeyfilename, seckeyfilename,

499

(mc.cred, pubkeyfilename, seckeyfilename,

557

500

GNUTLS_OPENPGP_FMT_BASE64);

558

501

if(ret != GNUTLS_E_SUCCESS){

559

fprintf_plus(stderr,

560

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

561

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

562

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

563

safer_gnutls_strerror(ret));

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));

564

507

goto globalfail;

565

508

}

566

509

567

510

/* GnuTLS server initialization */

568

ret = gnutls_dh_params_init(&mc->dh_params);

569

if(ret != GNUTLS_E_SUCCESS){

570

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

571

" initialization: %s\n",

572

safer_gnutls_strerror(ret));

573

goto globalfail;

574

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

747

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

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);

748

525

749

526

return 0;

750

527

751

528

globalfail:

752

529

753

gnutls_certificate_free_credentials(mc->cred);

754

gnutls_dh_params_deinit(mc->dh_params);

530

gnutls_certificate_free_credentials(mc.cred);

531

gnutls_global_deinit();

532

gnutls_dh_params_deinit(mc.dh_params);

755

533

return -1;

756

534

}

757

535

758

__attribute__((nonnull, warn_unused_result))

759

static int init_gnutls_session(gnutls_session_t *session,

760

mandos_context *mc){

536

static int init_gnutls_session(gnutls_session_t *session){

761

537

int ret;

762

538

/* GnuTLS session creation */

763

539

do {

767

543

}

768

544

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

769

545

if(ret != GNUTLS_E_SUCCESS){

770

fprintf_plus(stderr,

771

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

772

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

773

548

}

774

549

775

550

{

776

551

const char *err;

777

552

do {

778

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

553

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

779

554

if(quit_now){

780

555

gnutls_deinit(*session);

781

556

return -1;

782

557

}

783

558

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

784

559

if(ret != GNUTLS_E_SUCCESS){

785

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

786

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

787

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

788

563

gnutls_deinit(*session);

789

564

return -1;

790

565

}

792

567

793

568

do {

794

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

795

mc->cred);

570

mc.cred);

796

571

if(quit_now){

797

572

gnutls_deinit(*session);

798

573

return -1;

799

574

}

800

575

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

801

576

if(ret != GNUTLS_E_SUCCESS){

802

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

803

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

804

579

gnutls_deinit(*session);

805

580

return -1;

806

581

}

808

583

/* ignore client certificate if any. */

809

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

585

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

811

588

return 0;

812

589

}

813

590

815

592

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

816

593

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

817

594

818

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

819

__attribute__((warn_unused_result))

820

error_t raise_privileges(void){

821

error_t old_errno = errno;

822

error_t ret_errno = 0;

823

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

824

ret_errno = errno;

825

}

826

errno = old_errno;

827

return ret_errno;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

error_t raise_privileges_permanently(void){

833

error_t old_errno = errno;

834

error_t ret_errno = raise_privileges();

835

if(ret_errno != 0){

836

errno = old_errno;

837

return ret_errno;

838

}

839

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

840

ret_errno = errno;

841

}

842

errno = old_errno;

843

return ret_errno;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

error_t lower_privileges(void){

849

error_t old_errno = errno;

850

error_t ret_errno = 0;

851

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

852

ret_errno = errno;

853

}

854

errno = old_errno;

855

return ret_errno;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

error_t lower_privileges_permanently(void){

861

error_t old_errno = errno;

862

error_t ret_errno = 0;

863

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

864

ret_errno = errno;

865

}

866

errno = old_errno;

867

return ret_errno;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

595

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

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

596

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

1039

597

AvahiIfIndex if_index,

1040

int af, mandos_context *mc){

598

int af){

1041

599

int ret, tcp_sd = -1;

1042

600

ssize_t sret;

1043

struct sockaddr_storage to;

601

union {

602

struct sockaddr_in in;

603

struct sockaddr_in6 in6;

604

} to;

1044

605

char *buffer = NULL;

1045

606

char *decrypted_buffer = NULL;

1046

607

size_t buffer_length = 0;

1049

610

int retval = -1;

1050

611

gnutls_session_t session;

1051

612

int pf; /* Protocol family */

1052

bool route_added = false;

1053

613

1054

614

errno = 0;

1055

615

1066

626

pf = PF_INET;

1067

627

break;

1068

628

default:

1069

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

629

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

1070

630

errno = EINVAL;

1071

631

return -1;

1072

632

}

1073

633

1074

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

1075

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

1076

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

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

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

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

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

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

1106

ret = init_gnutls_session(&session, mc);

634

ret = init_gnutls_session(&session);

1107

635

if(ret != 0){

1108

636

return -1;

1109

637

}

1110

638

1111

639

if(debug){

1112

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

1113

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

640

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

641

"\n", ip, port);

1114

642

}

1115

643

1116

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

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

645

if(tcp_sd < 0){

1118

646

int e = errno;

1119

647

perror_plus("socket");

1126

654

goto mandos_end;

1127

655

}

1128

656

657

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

1129

658

if(af == AF_INET6){

1130

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

1131

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

1132

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

659

to.in6.sin6_family = (sa_family_t)af;

660

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

1133

661

} else { /* IPv4 */

1134

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

1135

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

1136

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

662

to.in.sin_family = (sa_family_t)af;

663

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

1137

664

}

1138

665

if(ret < 0 ){

1139

666

int e = errno;

1143

670

}

1144

671

if(ret == 0){

1145

672

int e = errno;

1146

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

673

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

1147

674

errno = e;

1148

675

goto mandos_end;

1149

676

}

1150

677

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

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*/

1154

685

if(if_index == AVAHI_IF_UNSPEC){

1155

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

1156

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

1157

688

errno = EINVAL;

1158

689

goto mandos_end;

1159

690

}

1160

691

/* Set the network interface number as scope */

1161

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

692

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

693

}

1163

694

} else {

1164

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

695

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

696

-Wconversion and

697

-Wunreachable-code */

1165

698

}

1166

699

1167

700

if(quit_now){

1175

708

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

1176

709

perror_plus("if_indextoname");

1177

710

} else {

1178

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

1179

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

711

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

712

ip, interface, port);

1180

713

}

1181

714

} else {

1182

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

1183

ip, (uintmax_t)port);

715

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

716

port);

1184

717

}

1185

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

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

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

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;

1267

759

}

1268

760

1269

761

const char *out = mandos_protocol_version;

1271

763

while(true){

1272

764

size_t out_size = strlen(out);

1273

765

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

1274

out_size - written));

766

out_size - written));

1275

767

if(ret == -1){

1276

768

int e = errno;

1277

769

perror_plus("write");

1297

789

}

1298

790

1299

791

if(debug){

1300

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

792

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

1301

793

}

1302

794

1303

795

if(quit_now){

1305

797

goto mandos_end;

1306

798

}

1307

799

1308

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

1309

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

1310

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

1311

gnutls_transport_set_ptr(session,

1312

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

802

1314

803

if(quit_now){

1315

804

errno = EINTR;

1326

815

1327

816

if(ret != GNUTLS_E_SUCCESS){

1328

817

if(debug){

1329

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

818

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

1330

819

gnutls_perror(ret);

1331

820

}

1332

821

errno = EPROTO;

1336

825

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

1337

826

1338

827

if(debug){

1339

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1340

" %s\n", ip);

828

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

829

ip);

1341

830

}

1342

831

1343

832

while(true){

1348

837

}

1349

838

1350

839

buffer_capacity = incbuffer(&buffer, buffer_length,

1351

buffer_capacity);

840

buffer_capacity);

1352

841

if(buffer_capacity == 0){

1353

842

int e = errno;

1354

843

perror_plus("incbuffer");

1381

870

}

1382

871

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

1383

872

if(ret < 0){

1384

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

1385

"***\n");

873

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

1386

874

gnutls_perror(ret);

1387

875

errno = EPROTO;

1388

876

goto mandos_end;

1389

877

}

1390

878

break;

1391

879

default:

1392

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

1393

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

1394

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1395

883

errno = EIO;

1396

884

goto mandos_end;

1401

889

}

1402

890

1403

891

if(debug){

1404

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

892

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

1405

893

}

1406

894

1407

895

if(quit_now){

1419

907

1420

908

if(buffer_length > 0){

1421

909

ssize_t decrypted_buffer_size;

1422

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1423

&decrypted_buffer, mc);

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

1424

913

if(decrypted_buffer_size >= 0){

1425

914

1426

915

written = 0;

1436

925

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

1437

926

int e = errno;

1438

927

if(debug){

1439

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

1440

strerror(errno));

928

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

929

strerror(errno));

1441

930

}

1442

931

errno = e;

1443

932

goto mandos_end;

1452

941

1453

942

mandos_end:

1454

943

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

1461

944

int e = errno;

1462

945

free(decrypted_buffer);

1463

946

free(buffer);

1464

947

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

948

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

1466

949

}

1467

950

if(ret == -1){

1468

951

if(e == 0){

1480

963

return retval;

1481

964

}

1482

965

1483

__attribute__((nonnull))

1484

966

static void resolve_callback(AvahiSServiceResolver *r,

1485

967

AvahiIfIndex interface,

1486

968

AvahiProtocol proto,

1494

976

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

978

flags,

1497

void *mc){

1498

if(r == NULL){

1499

return;

1500

}

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1501

981

1502

982

/* Called whenever a service has been resolved successfully or

1503

983

timed out */

1504

984

1505

985

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

986

return;

1508

987

}

1509

988

1510

989

switch(event){

1511

990

default:

1512

991

case AVAHI_RESOLVER_FAILURE:

1513

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

1514

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

1515

domain,

1516

avahi_strerror(avahi_server_errno

1517

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

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)));

1518

995

break;

1519

996

1520

997

case AVAHI_RESOLVER_FOUND:

1522

999

char ip[AVAHI_ADDRESS_STR_MAX];

1523

1000

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

1524

1001

if(debug){

1525

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

1526

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

1527

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

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);

1528

1005

}

1529

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

1530

interface,

1531

avahi_proto_to_af(proto),

1532

mc);

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1533

1008

if(ret == 0){

1534

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1535

1010

} else {

1536

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

1537

avahi_proto_to_af(proto),

1538

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

1539

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

1540

" list\n", name);

1541

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1542

1013

}

1543

1014

}

1544

1015

}

1554

1025

const char *domain,

1555

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

1027

flags,

1557

void *mc){

1558

if(b == NULL){

1559

return;

1560

}

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1561

1030

1562

1031

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

1563

1032

is removed from the LAN */

1570

1039

default:

1571

1040

case AVAHI_BROWSER_FAILURE:

1572

1041

1573

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

1574

avahi_strerror(avahi_server_errno

1575

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

1576

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1577

1045

return;

1578

1046

1579

1047

case AVAHI_BROWSER_NEW:

1582

1050

the callback function is called the Avahi server will free the

1583

1051

resolver for us. */

1584

1052

1585

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

1586

interface, protocol, name, type,

1587

domain, protocol, 0,

1588

resolve_callback, mc) == NULL)

1589

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

1590

" %s\n", name,

1591

avahi_strerror(avahi_server_errno

1592

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

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)));

1593

1058

break;

1594

1059

1595

1060

case AVAHI_BROWSER_REMOVE:

1598

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1599

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1600

1065

if(debug){

1601

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

1602

" searching...\n");

1066

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

1603

1067

}

1604

1068

break;

1605

1069

}

1614

1078

signal_received = sig;

1615

1079

int old_errno = errno;

1616

1080

/* set main loop to exit */

1617

if(simple_poll != NULL){

1618

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1619

1083

}

1620

1084

errno = old_errno;

1621

1085

}

1622

1086

1623

__attribute__((nonnull, warn_unused_result))

1624

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

1625

int ret;

1626

error_t ret_errno;

1627

1628

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

1629

if(s < 0){

1630

ret_errno = errno;

1631

perror_plus("socket");

1632

errno = ret_errno;

1633

return false;

1634

}

1635

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

1636

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

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

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 = 2+(sizeof(ifreq_flags)*2)+1; /* "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){

1639

1143

if(debug){

1640

ret_errno = errno;

1641

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = ret_errno;

1144

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

1145

flagstring, if_entry->d_name);

1643

1146

}

1644

return false;

1147

free(flagstring);

1148

return 0;

1645

1149

}

1646

return true;

1647

}

1648

1649

__attribute__((nonnull, warn_unused_result))

1650

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

1651

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1652

1152

/* Reject the loopback device */

1653

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1654

1154

if(debug){

1655

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

1656

ifname);

1155

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

1156

if_entry->d_name);

1657

1157

}

1658

return false;

1158

return 0;

1659

1159

}

1660

1160

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

1661

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

1161

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

1662

1162

if(debug){

1663

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

1664

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

1163

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

1164

if_entry->d_name);

1665

1165

}

1666

return true;

1166

return 1;

1667

1167

}

1668

1168

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

1669

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

1169

if(not (flags & IFF_BROADCAST)){

1670

1170

if(debug){

1671

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1672

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

1171

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

1172

if_entry->d_name);

1673

1173

}

1674

return false;

1174

return 0;

1675

1175

}

1676

1176

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

1677

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1678

1178

if(debug){

1679

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

1680

ifname);

1179

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

1180

if_entry->d_name);

1681

1181

}

1682

return false;

1182

return 0;

1683

1183

}

1684

1685

1184

/* Accept this device */

1686

1185

if(debug){

1687

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

1688

}

1689

return true;

1690

}

1691

1692

/*

1693

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

1694

* corresponds to an acceptable network device.

1695

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

1696

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

int good_interface(const struct dirent *if_entry){

1699

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

1700

return 0;

1701

}

1702

1703

struct ifreq ifr;

1704

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

1705

if(debug){

1706

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

1707

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

1708

}

1709

return 0;

1710

}

1711

1712

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

1713

return 0;

1186

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

1187

if_entry->d_name);

1714

1188

}

1715

1189

return 1;

1716

1190

}

1717

1191

1718

/*

1719

* This function determines if a network interface is up.

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

bool interface_is_up(const char *interface){

1723

struct ifreq ifr;

1724

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

1725

if(debug){

1726

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

1727

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

1728

}

1729

return false;

1730

}

1731

1732

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

1733

}

1734

1735

/*

1736

* This function determines if a network interface is running

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_running(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1753

1192

int notdotentries(const struct dirent *direntry){

1754

1193

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

1755

1194

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

1761

1200

return 1;

1762

1201

}

1763

1202

1764

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

1765

__attribute__((nonnull, warn_unused_result))

1766

int runnable_hook(const struct dirent *direntry){

1767

int ret;

1768

size_t sret;

1769

struct stat st;

1770

1771

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

1772

/* Empty name? */

1773

return 0;

1774

}

1775

1776

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

1777

"abcdefghijklmnopqrstuvwxyz"

1778

"0123456789"

1779

"_.-");

1780

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

1781

/* Contains non-allowed characters */

1782

if(debug){

1783

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

1784

direntry->d_name);

1785

}

1786

return 0;

1787

}

1788

1789

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

1790

if(ret == -1){

1791

if(debug){

1792

perror_plus("Could not stat hook");

1793

}

1794

return 0;

1795

}

1796

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

1797

/* Not a regular file */

1798

if(debug){

1799

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

1800

direntry->d_name);

1801

}

1802

return 0;

1803

}

1804

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

1805

/* Not executable */

1806

if(debug){

1807

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

1808

direntry->d_name);

1809

}

1810

return 0;

1811

}

1812

if(debug){

1813

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

1814

direntry->d_name);

1815

}

1816

return 1;

1817

}

1818

1819

__attribute__((nonnull, warn_unused_result))

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

mandos_context *mc){

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1822

1204

int ret;

1823

1205

struct timespec now;

1824

1206

struct timespec waited_time;

1825

1207

intmax_t block_time;

1826

1208

1827

1209

while(true){

1828

if(mc->current_server == NULL){

1829

if(debug){

1830

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

1831

" No timeout!\n");

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1832

1214

}

1833

1215

ret = avahi_simple_poll_iterate(s, -1);

1834

1216

} else {

1835

if(debug){

1836

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

1837

" it, or wait\n");

1217

if (debug){

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1838

1220

}

1839

1221

/* the current time */

1840

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1845

1227

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

1846

1228

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

1847

1229

waited_time.tv_sec = (now.tv_sec

1848

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

1230

- mc.current_server->last_seen.tv_sec);

1849

1231

waited_time.tv_nsec = (now.tv_nsec

1850

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

1232

- mc.current_server->last_seen.tv_nsec);

1851

1233

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

1852

1234

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

1853

1235

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

1854

1236

block_time = ((retry_interval

1855

1237

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

1856

1238

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

1857

1858

if(debug){

1859

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

1860

block_time);

1239

1240

if (debug){

1241

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

1861

1242

}

1862

1243

1863

1244

if(block_time <= 0){

1864

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

1865

mc->current_server->port,

1866

mc->current_server->if_index,

1867

mc->current_server->af, mc);

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1868

1249

if(ret == 0){

1869

avahi_simple_poll_quit(s);

1250

avahi_simple_poll_quit(mc.simple_poll);

1870

1251

return 0;

1871

1252

}

1872

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1873

&mc->current_server->last_seen);

1254

&mc.current_server->last_seen);

1874

1255

if(ret == -1){

1875

1256

perror_plus("clock_gettime");

1876

1257

return -1;

1877

1258

}

1878

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

1259

mc.current_server = mc.current_server->next;

1879

1260

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

1880

1261

servers, but don't block */

1881

1262

}

1883

1264

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

1884

1265

}

1885

1266

if(ret != 0){

1886

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

1267

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

1887

1268

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

1888

1269

}

1889

1270

}

1890

1271

}

1891

1272

}

1892

1273

1893

__attribute__((nonnull))

1894

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

1895

const float delay){

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

1920

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

1921

if(devnull == -1){

1922

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

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1930

}

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1977

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1982

free(delaystring);

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

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

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

2051

} else {

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

2071

}

2072

2073

__attribute__((nonnull, warn_unused_result))

2074

error_t bring_up_interface(const char *const interface,

2075

const float delay){

2076

error_t old_errno = errno;

2077

int ret;

2078

struct ifreq network;

2079

unsigned int if_index = if_nametoindex(interface);

2080

if(if_index == 0){

2081

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

2082

errno = old_errno;

2083

return ENXIO;

2084

}

2085

2086

if(quit_now){

2087

errno = old_errno;

2088

return EINTR;

2089

}

2090

2091

if(not interface_is_up(interface)){

2092

error_t ret_errno = 0, ioctl_errno = 0;

2093

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

2094

ret_errno = errno;

2095

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

2096

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

2097

errno = old_errno;

2098

return ret_errno;

2099

}

2100

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

2101

2102

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

2103

if(sd == -1){

2104

ret_errno = errno;

2105

perror_plus("socket");

2106

errno = old_errno;

2107

return ret_errno;

2108

}

2109

2110

if(quit_now){

2111

ret = close(sd);

2112

if(ret == -1){

2113

perror_plus("close");

2114

}

2115

errno = old_errno;

2116

return EINTR;

2117

}

2118

2119

if(debug){

2120

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

2121

interface);

2122

}

2123

2124

/* Raise privileges */

2125

ret_errno = raise_privileges();

2126

if(ret_errno != 0){

2127

errno = ret_errno;

2128

perror_plus("Failed to raise privileges");

2129

}

2130

2131

#ifdef __linux__

2132

int ret_linux;

2133

bool restore_loglevel = false;

2134

if(ret_errno == 0){

2135

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2136

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

2137

ret_linux = klogctl(8, NULL, 5);

2138

if(ret_linux == -1){

2139

perror_plus("klogctl");

2140

} else {

2141

restore_loglevel = true;

2142

}

2143

}

2144

#endif /* __linux__ */

2145

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

2146

ioctl_errno = errno;

2147

#ifdef __linux__

2148

if(restore_loglevel){

2149

ret_linux = klogctl(7, NULL, 0);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

}

2153

}

2154

#endif /* __linux__ */

2155

2156

/* If raise_privileges() succeeded above */

2157

if(ret_errno == 0){

2158

/* Lower privileges */

2159

ret_errno = lower_privileges();

2160

if(ret_errno != 0){

2161

errno = ret_errno;

2162

perror_plus("Failed to lower privileges");

2163

}

2164

}

2165

2166

/* Close the socket */

2167

ret = close(sd);

2168

if(ret == -1){

2169

perror_plus("close");

2170

}

2171

2172

if(ret_setflags == -1){

2173

errno = ioctl_errno;

2174

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2175

errno = old_errno;

2176

return ioctl_errno;

2177

}

2178

} else if(debug){

2179

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

2180

interface);

2181

}

2182

2183

/* Sleep checking until interface is running.

2184

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

2185

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

2186

if(interface_is_running(interface)){

2187

break;

2188

}

2189

struct timespec sleeptime = { .tv_nsec = 250000000 };

2190

ret = nanosleep(&sleeptime, NULL);

2191

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

2192

perror_plus("nanosleep");

2193

}

2194

}

2195

2196

errno = old_errno;

2197

return 0;

2198

}

2199

2200

__attribute__((nonnull, warn_unused_result))

2201

error_t take_down_interface(const char *const interface){

2202

error_t old_errno = errno;

2203

struct ifreq network;

2204

unsigned int if_index = if_nametoindex(interface);

2205

if(if_index == 0){

2206

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

2207

errno = old_errno;

2208

return ENXIO;

2209

}

2210

if(interface_is_up(interface)){

2211

error_t ret_errno = 0, ioctl_errno = 0;

2212

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

2213

ret_errno = errno;

2214

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

2215

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

2216

errno = old_errno;

2217

return ret_errno;

2218

}

2219

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

2220

2221

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

2222

if(sd == -1){

2223

ret_errno = errno;

2224

perror_plus("socket");

2225

errno = old_errno;

2226

return ret_errno;

2227

}

2228

2229

if(debug){

2230

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

2231

interface);

2232

}

2233

2234

/* Raise privileges */

2235

ret_errno = raise_privileges();

2236

if(ret_errno != 0){

2237

errno = ret_errno;

2238

perror_plus("Failed to raise privileges");

2239

}

2240

2241

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

2242

ioctl_errno = errno;

2243

2244

/* If raise_privileges() succeeded above */

2245

if(ret_errno == 0){

2246

/* Lower privileges */

2247

ret_errno = lower_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to lower privileges");

2251

}

2252

}

2253

2254

/* Close the socket */

2255

int ret = close(sd);

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2259

2260

if(ret_setflags == -1){

2261

errno = ioctl_errno;

2262

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2263

errno = old_errno;

2264

return ioctl_errno;

2265

}

2266

} else if(debug){

2267

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

2268

interface);

2269

}

2270

2271

errno = old_errno;

2272

return 0;

2273

}

2274

2275

1274

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

2276

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

2277

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

2278

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

2279

.current_server = NULL, .interfaces = NULL,

2280

.interfaces_size = 0 };

2281

1275

AvahiSServiceBrowser *sb = NULL;

2282

error_t ret_errno;

1276

int error;

2283

1277

int ret;

2284

1278

intmax_t tmpmax;

2285

1279

char *tmp;

2286

1280

int exitcode = EXIT_SUCCESS;

2287

char *interfaces_to_take_down = NULL;

2288

size_t interfaces_to_take_down_size = 0;

2289

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

2290

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

2291

char *tempdir = NULL;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1287

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

1288

bool tempdir_created = false;

2292

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2293

1290

const char *seckey = PATHDIR "/" SECKEY;

2294

1291

const char *pubkey = PATHDIR "/" PUBKEY;

2295

const char *dh_params_file = NULL;

2296

char *interfaces_hooks = NULL;

2297

1292

2298

1293

bool gnutls_initialized = false;

2299

1294

bool gpgme_initialized = false;

2351

1346

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

2352

1347

" Diffie-Hellman key exchange",

2353

1348

.group = 2 },

2354

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

2355

.arg = "FILE",

2356

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

2357

" for the Diffie-Hellman key exchange",

2358

.group = 2 },

2359

1349

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

2360

1350

.arg = "STRING",

2361

1351

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

2366

1356

.group = 2 },

2367

1357

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

2368

1358

.arg = "SECONDS",

2369

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

2370

.group = 2 },

2371

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

2372

.arg = "DIR",

2373

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

1359

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

2374

1360

.group = 2 },

2375

1361

/*

2376

1362

* These reproduce what we would get without ARGP_NO_HELP

2395

1381

connect_to = arg;

2396

1382

break;

2397

1383

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

2398

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

2399

arg, (int)',');

2400

if(ret_errno != 0){

2401

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

2402

}

1384

interface = arg;

2403

1385

break;

2404

1386

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

2405

1387

seckey = arg;

2416

1398

}

2417

1399

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

2418

1400

break;

2419

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

2420

dh_params_file = arg;

2421

break;

2422

1401

case 130: /* --priority */

2423

1402

mc.priority = arg;

2424

1403

break;

2432

1411

errno = 0;

2433

1412

retry_interval = strtod(arg, &tmp);

2434

1413

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

2435

or (retry_interval * 1000) > INT_MAX

2436

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

2437

1415

argp_error(state, "Bad retry interval");

2438

1416

}

2439

1417

break;

2440

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

2441

hookdir = arg;

2442

break;

2443

1418

/*

2444

1419

* These reproduce what we would get without ARGP_NO_HELP

2445

1420

*/

2451

1426

argp_state_help(state, state->out_stream,

2452

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2453

1428

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

2454

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

1429

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

2455

1430

exit(argp_err_exit_status);

2456

1431

break;

2457

1432

default:

2480

1455

goto end;

2481

1456

}

2482

1457

}

2483

1458

2484

1459

{

2485

1460

/* Work around Debian bug #633582:

2486

1461

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

2487

2488

/* Re-raise privileges */

2489

ret_errno = raise_privileges();

2490

if(ret_errno != 0){

2491

errno = ret_errno;

2492

perror_plus("Failed to raise privileges");

2493

} else {

2494

struct stat st;

2495

2496

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

2497

int seckey_fd = open(seckey, O_RDONLY);

2498

if(seckey_fd == -1){

2499

perror_plus("open");

2500

} else {

2501

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

2502

if(ret == -1){

2503

perror_plus("fstat");

2504

} else {

2505

if(S_ISREG(st.st_mode)

2506

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

2507

ret = fchown(seckey_fd, uid, gid);

2508

if(ret == -1){

2509

perror_plus("fchown");

2510

}

2511

}

2512

}

2513

close(seckey_fd);

2514

}

2515

}

2516

2517

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

2518

int pubkey_fd = open(pubkey, O_RDONLY);

2519

if(pubkey_fd == -1){

2520

perror_plus("open");

2521

} else {

2522

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

2523

if(ret == -1){

2524

perror_plus("fstat");

2525

} else {

2526

if(S_ISREG(st.st_mode)

2527

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

2528

ret = fchown(pubkey_fd, uid, gid);

2529

if(ret == -1){

2530

perror_plus("fchown");

2531

}

2532

}

2533

}

2534

close(pubkey_fd);

2535

}

2536

}

2537

2538

if(dh_params_file != NULL

2539

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

2540

int dhparams_fd = open(dh_params_file, O_RDONLY);

2541

if(dhparams_fd == -1){

2542

perror_plus("open");

2543

} else {

2544

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

2545

if(ret == -1){

2546

perror_plus("fstat");

2547

} else {

2548

if(S_ISREG(st.st_mode)

2549

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

2550

ret = fchown(dhparams_fd, uid, gid);

2551

if(ret == -1){

2552

perror_plus("fchown");

2553

}

2554

}

2555

}

2556

close(dhparams_fd);

2557

}

2558

}

2559

2560

/* Lower privileges */

2561

ret_errno = lower_privileges();

2562

if(ret_errno != 0){

2563

errno = ret_errno;

2564

perror_plus("Failed to lower privileges");

2565

}

2566

}

2567

}

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

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

2573

interface))){

2574

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

2575

and if_nametoindex(interface) == 0){

2576

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

2577

fprintf_plus(stderr, "Not using nonexisting interface"

2578

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

2579

}

2580

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

2581

interface = NULL;

2582

}

2583

}

2584

}

2585

2586

/* Run network hooks */

2587

{

2588

if(mc.interfaces != NULL){

2589

interfaces_hooks = malloc(mc.interfaces_size);

2590

if(interfaces_hooks == NULL){

2591

perror_plus("malloc");

2592

goto end;

2593

}

2594

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

2595

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

2596

}

2597

run_network_hooks("start", interfaces_hooks != NULL ?

2598

interfaces_hooks : "", delay);

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

2599

1513

}

2600

1514

2601

1515

if(not debug){

2602

1516

avahi_set_log_function(empty_log);

2603

1517

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

2604

1543

2605

1544

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

2606

1545

from the signal handler */

2607

1546

/* Initialize the pseudo-RNG for Avahi */

2608

1547

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

2609

simple_poll = avahi_simple_poll_new();

2610

if(simple_poll == NULL){

2611

fprintf_plus(stderr,

2612

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

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

2613

1551

exitcode = EX_UNAVAILABLE;

2614

1552

goto end;

2615

1553

}

2677

1615

}

2678

1616

}

2679

1617

2680

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

2681

if(mc.interfaces == NULL){

2682

struct dirent **direntries = NULL;

2683

/* Look for any good interfaces */

2684

ret = scandir(sys_class_net, &direntries, good_interface,

2685

alphasort);

2686

if(ret >= 1){

2687

/* Add all found interfaces to interfaces list */

2688

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

2689

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

2690

direntries[i]->d_name);

2691

if(ret_errno != 0){

2692

errno = ret_errno;

2693

perror_plus("argz_add");

2694

free(direntries[i]);

2695

continue;

2696

}

2697

if(debug){

2698

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

2699

direntries[i]->d_name);

2700

}

2701

free(direntries[i]);

2702

}

2703

free(direntries);

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

1703

}

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

break;

1723

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

2704

1754

} else {

2705

if(ret == 0){

2706

free(direntries);

2707

}

2708

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

2709

exitcode = EXIT_FAILURE;

2710

goto end;

2711

}

2712

}

2713

2714

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

2715

{

2716

char *interface = NULL;

2717

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

2718

interface))){

2719

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

2720

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

2721

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

2722

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

2723

interface);

2724

interface = NULL;

2725

while((interface = argz_next(mc.interfaces,

2726

mc.interfaces_size, interface))){

2727

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

2728

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

2729

interface);

2730

interface = NULL;

2731

}

2732

}

2733

break;

2734

}

2735

bool interface_was_up = interface_is_up(interface);

2736

errno = bring_up_interface(interface, delay);

2737

if(not interface_was_up){

2738

if(errno != 0){

2739

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

2740

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

2741

} else {

2742

errno = argz_add(&interfaces_to_take_down,

2743

&interfaces_to_take_down_size,

2744

interface);

2745

if(errno != 0){

2746

perror_plus("argz_add");

2747

}

2748

}

2749

}

2750

}

2751

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

2752

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

2753

}

2754

}

2755

2756

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

2757

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

2758

if(debug){

2759

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

2760

mc.interfaces);

2761

}

2762

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

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

1760

}

2763

1761

}

2764

1762

2765

1763

if(quit_now){

2766

1764

goto end;

2767

1765

}

2768

1766

2769

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

1767

ret = init_gnutls_global(pubkey, seckey);

2770

1768

if(ret == -1){

2771

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

1769

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

2772

1770

exitcode = EX_UNAVAILABLE;

2773

1771

goto end;

2774

1772

} else {

2779

1777

goto end;

2780

1778

}

2781

1779

2782

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

2783

tempdir = mkdtemp(run_tempdir);

2784

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

2785

if(debug){

2786

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

2787

run_tempdir, old_tempdir);

2788

}

2789

tempdir = mkdtemp(old_tempdir);

2790

}

2791

if(tempdir == NULL){

1780

if(mkdtemp(tempdir) == NULL){

2792

1781

perror_plus("mkdtemp");

2793

1782

goto end;

2794

1783

}

1784

tempdir_created = true;

2795

1785

2796

1786

if(quit_now){

2797

1787

goto end;

2798

1788

}

2799

1789

2800

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

2801

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

1790

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

1791

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

2802

1792

exitcode = EX_UNAVAILABLE;

2803

1793

goto end;

2804

1794

} else {

2813

1803

/* Connect directly, do not use Zeroconf */

2814

1804

/* (Mainly meant for debugging) */

2815

1805

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

2816

2817

1806

if(address == NULL){

2818

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

1807

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

2819

1808

exitcode = EX_USAGE;

2820

1809

goto end;

2821

1810

}

2824

1813

goto end;

2825

1814

}

2826

1815

2827

in_port_t port;

1816

uint16_t port;

2828

1817

errno = 0;

2829

1818

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

2830

1819

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

2831

or tmpmax != (in_port_t)tmpmax){

2832

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2833

1822

exitcode = EX_USAGE;

2834

1823

goto end;

2835

1824

}

2836

1825

2837

1826

if(quit_now){

2838

1827

goto end;

2839

1828

}

2840

1829

2841

port = (in_port_t)tmpmax;

1830

port = (uint16_t)tmpmax;

2842

1831

*address = '\0';

1832

address = connect_to;

2843

1833

/* Colon in address indicates IPv6 */

2844

1834

int af;

2845

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

1835

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

2846

1836

af = AF_INET6;

2847

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

2848

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

2849

{

2850

connect_to++;

2851

address[-1] = '\0';

2852

}

2853

1837

} else {

2854

1838

af = AF_INET;

2855

1839

}

2856

address = connect_to;

2857

1840

2858

1841

if(quit_now){

2859

1842

goto end;

2860

1843

}

2861

1844

2862

1845

while(not quit_now){

2863

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

2864

&mc);

1846

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

2865

1847

if(quit_now or ret == 0){

2866

1848

break;

2867

1849

}

2868

if(debug){

2869

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

2870

(int)retry_interval);

2871

}

2872

sleep((unsigned int)retry_interval);

2873

}

2874

2875

if(not quit_now){

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

2876

1854

exitcode = EXIT_SUCCESS;

2877

1855

}

2878

1856

2879

1857

goto end;

2880

1858

}

2881

1859

2893

1871

config.publish_domain = 0;

2894

1872

2895

1873

/* Allocate a new server */

2896

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2897

&config, NULL, NULL, &ret_errno);

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2898

1877

2899

1878

/* Free the Avahi configuration data */

2900

1879

avahi_server_config_free(&config);

2902

1881

2903

1882

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

2904

1883

if(mc.server == NULL){

2905

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

2906

avahi_strerror(ret_errno));

1884

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

1885

avahi_strerror(error));

2907

1886

exitcode = EX_UNAVAILABLE;

2908

1887

goto end;

2909

1888

}

2915

1894

/* Create the Avahi service browser */

2916

1895

sb = avahi_s_service_browser_new(mc.server, if_index,

2917

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2918

NULL, 0, browse_callback,

2919

(void *)&mc);

1897

NULL, 0, browse_callback, NULL);

2920

1898

if(sb == NULL){

2921

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

2922

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2923

1901

exitcode = EX_UNAVAILABLE;

2924

1902

goto end;

2925

1903

}

2931

1909

/* Run the main loop */

2932

1910

2933

1911

if(debug){

2934

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

1912

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

2935

1913

}

2936

2937

ret = avahi_loop_with_timeout(simple_poll,

2938

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

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

2939

1917

if(debug){

2940

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

2941

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

1918

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

1919

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

2942

1920

}

2943

1921

2944

1922

end:

2945

1923

2946

1924

if(debug){

2947

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

1925

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

2948

1926

}

2949

1927

2950

1928

/* Cleanup things */

2951

free(mc.interfaces);

2952

2953

1929

if(sb != NULL)

2954

1930

avahi_s_service_browser_free(sb);

2955

1931

2956

1932

if(mc.server != NULL)

2957

1933

avahi_server_free(mc.server);

2958

1934

2959

if(simple_poll != NULL)

2960

avahi_simple_poll_free(simple_poll);

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2961

1937

2962

1938

if(gnutls_initialized){

2963

1939

gnutls_certificate_free_credentials(mc.cred);

1940

gnutls_global_deinit();

2964

1941

gnutls_dh_params_deinit(mc.dh_params);

2965

1942

}

2966

1943

2967

1944

if(gpgme_initialized){

2968

1945

gpgme_release(mc.ctx);

2969

1946

}

2970

1947

2971

1948

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

2972

1949

has seen */

2973

1950

if(mc.current_server != NULL){

2974

1951

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

2975

1952

while(mc.current_server != NULL){

2976

1953

server *next = mc.current_server->next;

2977

#ifdef __GNUC__

2978

#pragma GCC diagnostic push

2979

#pragma GCC diagnostic ignored "-Wcast-qual"

2980

#endif

2981

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

2982

#ifdef __GNUC__

2983

#pragma GCC diagnostic pop

2984

#endif

2985

1954

free(mc.current_server);

2986

1955

mc.current_server = next;

2987

1956

}

2988

1957

}

2989

1958

2990

/* Re-raise privileges */

2991

{

2992

ret_errno = raise_privileges();

2993

if(ret_errno != 0){

2994

errno = ret_errno;

2995

perror_plus("Failed to raise privileges");

2996

} else {

2997

2998

/* Run network hooks */

2999

run_network_hooks("stop", interfaces_hooks != NULL ?

3000

interfaces_hooks : "", delay);

3001

3002

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

3003

{

3004

char *interface = NULL;

3005

while((interface=argz_next(interfaces_to_take_down,

3006

interfaces_to_take_down_size,

3007

interface))){

3008

ret_errno = take_down_interface(interface);

3009

if(ret_errno != 0){

3010

errno = ret_errno;

3011

perror_plus("Failed to take down interface");

3012

}

3013

}

3014

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

3015

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

3016

" down\n");

3017

}

3018

}

3019

}

3020

3021

ret_errno = lower_privileges_permanently();

3022

if(ret_errno != 0){

3023

errno = ret_errno;

3024

perror_plus("Failed to lower privileges permanently");

3025

}

3026

}

3027

3028

free(interfaces_to_take_down);

3029

free(interfaces_hooks);

3030

3031

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

3032

uintmax_t level){

3033

struct dirent **direntries = NULL;

3034

int dret;

3035

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

3036

O_RDONLY

3037

| O_NOFOLLOW

3038

| O_DIRECTORY

3039

| O_PATH));

3040

if(dir_fd == -1){

3041

perror_plus("open");

3042

}

3043

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

3044

notdotentries, alphasort);

3045

if(numentries >= 0){

3046

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

3047

if(debug){

3048

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

3049

dirname, direntries[i]->d_name);

3050

}

3051

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

3052

if(dret == -1){

3053

if(errno == EISDIR){

3054

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

3055

AT_REMOVEDIR);

3056

}

3057

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

3058

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

3059

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

3060

/* Recurse only in this special case */

3061

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

3062

dret = 0;

3063

}

3064

if(dret == -1){

3065

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

3066

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

3067

}

3068

}

3069

free(direntries[i]);

3070

}

3071

3072

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

3073

free(direntries);

3074

if(numentries == -1){

3075

perror_plus("scandirat");

3076

}

3077

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3078

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

3079

perror_plus("rmdir");

3080

}

3081

} else {

3082

perror_plus("scandirat");

3083

}

3084

close(dir_fd);

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

1966

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1976

}

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

1988

}

3085

1989

}

3086

1990

3087

1991

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

3088

if(tempdir != NULL){

3089

clean_dir_at(-1, tempdir, 0);

1992

if(tempdir_created){

1993

struct dirent **direntries = NULL;

1994

struct dirent *direntry = NULL;

1995

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

1996

if (ret > 0){

1997

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

1998

direntry = direntries[i];

1999

char *fullname = NULL;

2000

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

2001

direntry->d_name);

2002

if(ret < 0){

2003

perror_plus("asprintf");

2004

continue;

2005

}

2006

ret = remove(fullname);

2007

if(ret == -1){

2008

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

2009

strerror(errno));

2010

}

2011

free(fullname);

2012

}

2013

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2017

free(direntries);

2018

if (ret == -1){

2019

perror_plus("scandir");

2020

}

2021

ret = rmdir(tempdir);

2022

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

2023

perror_plus("rmdir");

2024

}

3090

2025

}

3091

2026

3092

2027

if(quit_now){