/mandos/release : revision 237.7.256

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

44

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

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

72

73

*/

73

74

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

74

75

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

75

setgid(), pause() */

76

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

76

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

77

unlinkat() */

78

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

77

79

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

78

80

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

79

81

argp_state, struct argp,

84

86

raise() */

85

87

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

86

88

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

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

90

WEXITSTATUS(), WTERMSIG() */

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

87

98

88

99

#ifdef __linux__

89

100

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

107

118

init_gnutls_session(),

108

119

GNUTLS_* */

109

120

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

121

/* gnutls_certificate_set_openpgp_key_file(),

122

GNUTLS_OPENPGP_FMT_BASE64 */

112

123

113

124

/* GPGME */

114

125

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

122

133

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

123

134

#define SECKEY "seckey.txt"

124

135

#define PUBKEY "pubkey.txt"

136

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

125

137

126

138

bool debug = false;

127

139

static const char mandos_protocol_version[] = "1";

128

140

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

129

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

141

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

142

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

143

char *connect_to = NULL;

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

149

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

150

typedef struct server{

151

const char *ip;

152

in_port_t port;

153

AvahiIfIndex if_index;

154

int af;

155

struct timespec last_seen;

156

struct server *next;

157

struct server *prev;

158

} server;

130

159

131

160

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

132

161

typedef struct {

133

AvahiSimplePoll *simple_poll;

134

162

AvahiServer *server;

135

163

gnutls_certificate_credentials_t cred;

136

164

unsigned int dh_bits;

137

165

gnutls_dh_params_t dh_params;

138

166

const char *priority;

139

167

gpgme_ctx_t ctx;

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

140

171

} mandos_context;

141

172

142

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

143

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

144

.dh_bits = 1024, .priority = "SECURE256"

145

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

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

146

175

147

176

sig_atomic_t quit_now = 0;

148

177

int signal_received = 0;

149

178

179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

184

errno = e;

185

perror(print_text);

186

}

187

188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

150

198

/*

151

199

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

152

200

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

153

201

* "buffer_length" is how much is already used.

154

202

*/

203

__attribute__((nonnull, warn_unused_result))

155

204

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

205

size_t buffer_capacity){

157

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

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

159

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

160

213

return 0;

161

214

}

215

*buffer = new_buf;

162

216

buffer_capacity += BUFFER_SIZE;

163

217

}

164

218

return buffer_capacity;

165

219

}

166

220

221

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

225

int ret;

226

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

232

.port = port,

233

.if_index = if_index,

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

/* Special case of first server */

245

if(*current_server == NULL){

246

new_server->next = new_server;

247

new_server->prev = new_server;

248

*current_server = new_server;

249

} else {

250

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

251

new_server->next = *current_server;

252

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

253

new_server->prev->next = new_server;

254

(*current_server)->prev = new_server;

255

}

256

return true;

257

}

258

167

259

/*

168

260

* Initialize GPGME.

169

261

*/

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

172

267

gpgme_error_t rc;

173

268

gpgme_engine_info_t engine_info;

174

269

175

176

270

/*

177

271

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

178

272

*/

179

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

180

274

int ret;

181

275

int fd;

182

276

gpgme_data_t pgp_data;

183

277

184

278

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

185

279

if(fd == -1){

186

perror("open");

280

perror_plus("open");

187

281

return false;

188

282

}

189

283

190

284

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

285

if(rc != GPG_ERR_NO_ERROR){

192

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

193

gpgme_strsource(rc), gpgme_strerror(rc));

286

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

287

gpgme_strsource(rc), gpgme_strerror(rc));

194

288

return false;

195

289

}

196

290

197

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

198

292

if(rc != GPG_ERR_NO_ERROR){

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

201

295

return false;

202

296

}

203

297

204

298

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

205

299

if(ret == -1){

206

perror("close");

300

perror_plus("close");

207

301

}

208

302

gpgme_data_release(pgp_data);

209

303

return true;

210

304

}

211

305

212

306

if(debug){

213

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

307

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

214

308

}

215

309

216

310

/* Init GPGME */

217

311

gpgme_check_version(NULL);

218

312

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

313

if(rc != GPG_ERR_NO_ERROR){

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

314

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

222

316

return false;

223

317

}

224

318

225

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

319

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

226

320

rc = gpgme_get_engine_info(&engine_info);

227

321

if(rc != GPG_ERR_NO_ERROR){

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

322

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

230

324

return false;

231

325

}

232

326

while(engine_info != NULL){

238

332

engine_info = engine_info->next;

239

333

}

240

334

if(engine_info == NULL){

241

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

335

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

336

tempdir);

242

337

return false;

243

338

}

244

339

245

340

/* Create new GPGME "context" */

246

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

341

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

247

342

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

343

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

344

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

345

gpgme_strerror(rc));

250

346

return false;

251

347

}

252

348

261

357

* Decrypt OpenPGP data.

262

358

* Returns -1 on error

263

359

*/

360

__attribute__((nonnull, warn_unused_result))

264

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

362

size_t crypto_size,

266

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

267

365

gpgme_data_t dh_crypto, dh_plain;

268

366

gpgme_error_t rc;

269

367

ssize_t ret;

271

369

ssize_t plaintext_length = 0;

272

370

273

371

if(debug){

274

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

372

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

275

373

}

276

374

277

375

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

278

376

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

377

0);

280

378

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

283

381

return -1;

284

382

}

285

383

286

384

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

287

385

rc = gpgme_data_new(&dh_plain);

288

386

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

387

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

291

390

gpgme_data_release(dh_crypto);

292

391

return -1;

293

392

}

294

393

295

394

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

296

395

data buffer */

297

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

396

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

298

397

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

301

400

plaintext_length = -1;

302

401

if(debug){

303

402

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

305

404

if(result == NULL){

306

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

405

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

307

406

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

407

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

408

result->unsupported_algorithm);

409

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

410

result->wrong_key_usage);

312

411

if(result->file_name != NULL){

313

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

412

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

314

413

}

315

414

gpgme_recipient_t recipient;

316

415

recipient = result->recipients;

317

416

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

417

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

420

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

421

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

324

424

recipient = recipient->next;

325

425

}

326

426

}

329

429

}

330

430

331

431

if(debug){

332

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

432

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

333

433

}

334

434

335

435

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

336

436

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

337

perror("gpgme_data_seek");

437

perror_plus("gpgme_data_seek");

338

438

plaintext_length = -1;

339

439

goto decrypt_end;

340

440

}

342

442

*plaintext = NULL;

343

443

while(true){

344

444

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

445

(size_t)plaintext_length,

446

plaintext_capacity);

347

447

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

448

perror_plus("incbuffer");

449

plaintext_length = -1;

450

goto decrypt_end;

351

451

}

352

452

353

453

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

458

break;

359

459

}

360

460

if(ret < 0){

361

perror("gpgme_data_read");

461

perror_plus("gpgme_data_read");

362

462

plaintext_length = -1;

363

463

goto decrypt_end;

364

464

}

366

466

}

367

467

368

468

if(debug){

369

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

469

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

370

470

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

371

471

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

372

472

}

383

483

return plaintext_length;

384

484

}

385

485

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

389

489

if(ret == NULL)

390

490

ret = "(unknown)";

391

491

return ret;

392

492

}

393

493

394

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

395

496

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

396

497

const char* string){

397

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

498

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

398

499

}

399

500

501

__attribute__((nonnull, warn_unused_result))

400

502

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

402

505

int ret;

403

506

404

507

if(debug){

405

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

508

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

406

509

}

407

510

408

511

ret = gnutls_global_init();

409

512

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

513

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

514

safer_gnutls_strerror(ret));

412

515

return -1;

413

516

}

414

517

421

524

}

422

525

423

526

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

528

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

529

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

530

safer_gnutls_strerror(ret));

431

531

gnutls_global_deinit();

432

532

return -1;

433

533

}

434

534

435

535

if(debug){

436

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

437

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

438

seckeyfilename);

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

439

540

}

440

541

441

542

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

443

544

GNUTLS_OPENPGP_FMT_BASE64);

444

545

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

546

fprintf_plus(stderr,

547

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

548

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

549

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

550

safer_gnutls_strerror(ret));

450

551

goto globalfail;

451

552

}

452

553

453

554

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

455

556

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

458

560

goto globalfail;

459

561

}

460

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

562

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

461

563

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

564

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

565

safer_gnutls_strerror(ret));

464

566

goto globalfail;

465

567

}

466

568

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

468

570

469

571

return 0;

470

572

471

573

globalfail:

472

574

473

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

474

576

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

476

578

return -1;

477

579

}

478

580

479

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

480

584

int ret;

481

585

/* GnuTLS session creation */

482

586

do {

486

590

}

487

591

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

488

592

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

491

596

}

492

597

493

598

{

494

599

const char *err;

495

600

do {

496

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

601

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

497

602

if(quit_now){

498

603

gnutls_deinit(*session);

499

604

return -1;

500

605

}

501

606

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

502

607

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

506

611

gnutls_deinit(*session);

507

612

return -1;

508

613

}

510

615

511

616

do {

512

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

618

mc->cred);

514

619

if(quit_now){

515

620

gnutls_deinit(*session);

516

621

return -1;

517

622

}

518

623

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

519

624

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

625

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

626

safer_gnutls_strerror(ret));

522

627

gnutls_deinit(*session);

523

628

return -1;

524

629

}

526

631

/* ignore client certificate if any. */

527

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

633

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

635

531

636

return 0;

532

637

}

536

641

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

537

642

538

643

/* Called when a Mandos server is found */

539

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

644

__attribute__((nonnull, warn_unused_result))

645

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

540

646

AvahiIfIndex if_index,

541

int af){

647

int af, mandos_context *mc){

542

648

int ret, tcp_sd = -1;

543

649

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

650

struct sockaddr_storage to;

548

651

char *buffer = NULL;

549

652

char *decrypted_buffer = NULL;

550

653

size_t buffer_length = 0;

569

672

pf = PF_INET;

570

673

break;

571

674

default:

572

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

675

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

573

676

errno = EINVAL;

574

677

return -1;

575

678

}

576

679

577

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

578

713

if(ret != 0){

579

714

return -1;

580

715

}

581

716

582

717

if(debug){

583

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

584

"\n", ip, port);

718

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

719

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

585

720

}

586

721

587

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

723

if(tcp_sd < 0){

589

724

int e = errno;

590

perror("socket");

725

perror_plus("socket");

591

726

errno = e;

592

727

goto mandos_end;

593

728

}

599

734

600

735

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

601

736

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

737

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

738

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

604

739

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

740

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

741

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

607

742

}

608

743

if(ret < 0 ){

609

744

int e = errno;

610

perror("inet_pton");

745

perror_plus("inet_pton");

611

746

errno = e;

612

747

goto mandos_end;

613

748

}

614

749

if(ret == 0){

615

750

int e = errno;

616

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

751

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

617

752

errno = e;

618

753

goto mandos_end;

619

754

}

620

755

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

628

759

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

760

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

761

" incomplete without a network interface\n");

631

762

errno = EINVAL;

632

763

goto mandos_end;

633

764

}

634

765

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

636

767

}

637

768

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

769

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

641

770

}

642

771

643

772

if(quit_now){

649

778

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

650

779

char interface[IF_NAMESIZE];

651

780

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

652

perror("if_indextoname");

781

perror_plus("if_indextoname");

653

782

} else {

654

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

655

ip, interface, port);

783

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

784

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

656

785

}

657

786

} else {

658

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

659

port);

787

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

788

ip, (uintmax_t)port);

660

789

}

661

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

792

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

667

797

} else {

668

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

669

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

670

802

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

677

809

}

678

810

}

679

811

683

815

}

684

816

685

817

if(af == AF_INET6){

686

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

818

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

819

sizeof(struct sockaddr_in6));

687

820

} else {

688

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

821

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

822

sizeof(struct sockaddr_in));

689

823

}

690

824

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

694

830

goto mandos_end;

695

831

}

696

832

704

840

while(true){

705

841

size_t out_size = strlen(out);

706

842

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

707

out_size - written));

843

out_size - written));

708

844

if(ret == -1){

709

845

int e = errno;

710

perror("write");

846

perror_plus("write");

711

847

errno = e;

712

848

goto mandos_end;

713

849

}

730

866

}

731

867

732

868

if(debug){

733

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

869

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

734

870

}

735

871

736

872

if(quit_now){

738

874

goto mandos_end;

739

875

}

740

876

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

882

743

883

if(quit_now){

744

884

errno = EINTR;

755

895

756

896

if(ret != GNUTLS_E_SUCCESS){

757

897

if(debug){

758

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

898

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

759

899

gnutls_perror(ret);

760

900

}

761

901

errno = EPROTO;

765

905

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

766

906

767

907

if(debug){

768

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

769

ip);

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

770

910

}

771

911

772

912

while(true){

777

917

}

778

918

779

919

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

920

buffer_capacity);

781

921

if(buffer_capacity == 0){

782

922

int e = errno;

783

perror("incbuffer");

923

perror_plus("incbuffer");

784

924

errno = e;

785

925

goto mandos_end;

786

926

}

810

950

}

811

951

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

812

952

if(ret < 0){

813

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

953

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

954

"***\n");

814

955

gnutls_perror(ret);

815

956

errno = EPROTO;

816

957

goto mandos_end;

817

958

}

818

959

break;

819

960

default:

820

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

821

" encrypted session with Mandos server\n");

961

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

962

" encrypted session with Mandos server\n");

822

963

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

964

errno = EIO;

824

965

goto mandos_end;

829

970

}

830

971

831

972

if(debug){

832

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

973

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

833

974

}

834

975

835

976

if(quit_now){

847

988

848

989

if(buffer_length > 0){

849

990

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

853

993

if(decrypted_buffer_size >= 0){

854

994

855

995

written = 0;

865

1005

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

866

1006

int e = errno;

867

1007

if(debug){

868

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

869

strerror(errno));

1008

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

1009

strerror(errno));

870

1010

}

871

1011

errno = e;

872

1012

goto mandos_end;

891

1031

if(e == 0){

892

1032

e = errno;

893

1033

}

894

perror("close");

1034

perror_plus("close");

895

1035

}

896

1036

gnutls_deinit(session);

1037

errno = e;

897

1038

if(quit_now){

898

e = EINTR;

1039

errno = EINTR;

899

1040

retval = -1;

900

1041

}

901

errno = e;

902

1042

}

903

1043

return retval;

904

1044

}

905

1045

1046

__attribute__((nonnull))

906

1047

static void resolve_callback(AvahiSServiceResolver *r,

907

1048

AvahiIfIndex interface,

908

1049

AvahiProtocol proto,

916

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1059

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

921

1064

922

1065

/* Called whenever a service has been resolved successfully or

923

1066

timed out */

929

1072

switch(event){

930

1073

default:

931

1074

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

935

1080

break;

936

1081

937

1082

case AVAHI_RESOLVER_FOUND:

939

1084

char ip[AVAHI_ADDRESS_STR_MAX];

940

1085

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

941

1086

if(debug){

942

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

943

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

944

ip, (intmax_t)interface, port);

1087

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

1088

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

1089

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

945

1090

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

948

1095

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1097

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

950

1104

}

951

1105

}

952

1106

}

962

1116

const char *domain,

963

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1118

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

967

1123

968

1124

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

969

1125

is removed from the LAN */

976

1132

default:

977

1133

case AVAHI_BROWSER_FAILURE:

978

1134

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1135

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

982

1139

return;

983

1140

984

1141

case AVAHI_BROWSER_NEW:

987

1144

the callback function is called the Avahi server will free the

988

1145

resolver for us. */

989

1146

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

995

1155

break;

996

1156

997

1157

case AVAHI_BROWSER_REMOVE:

1000

1160

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1161

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1162

if(debug){

1003

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

1163

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

1164

" searching...\n");

1004

1165

}

1005

1166

break;

1006

1167

}

1007

1168

}

1008

1169

1009

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

1170

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

1010

1171

static void handle_sigterm(int sig){

1011

1172

if(quit_now){

1012

1173

return;

1014

1175

quit_now = 1;

1015

1176

signal_received = sig;

1016

1177

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1178

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1181

}

1182

errno = old_errno;

1183

}

1184

1185

__attribute__((nonnull, warn_unused_result))

1186

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

1187

int ret;

1188

error_t ret_errno;

1189

1190

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

1191

if(s < 0){

1192

ret_errno = errno;

1193

perror_plus("socket");

1194

errno = ret_errno;

1195

return false;

1196

}

1197

strcpy(ifr->ifr_name, ifname);

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

if(ret == -1){

1200

if(debug){

1201

ret_errno = errno;

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

}

1205

return false;

1206

}

1207

return true;

1208

}

1209

1210

__attribute__((nonnull, warn_unused_result))

1211

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

1212

1213

/* Reject the loopback device */

1214

if(ifr->ifr_flags & IFF_LOOPBACK){

1215

if(debug){

1216

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

1217

ifname);

1218

}

1219

return false;

1220

}

1221

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

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return true;

1228

}

1229

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

1230

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

1231

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1234

}

1235

return false;

1236

}

1237

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

1238

if(ifr->ifr_flags & IFF_NOARP){

1239

if(debug){

1240

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

1241

ifname);

1242

}

1243

return false;

1244

}

1245

1246

/* Accept this device */

1247

if(debug){

1248

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

1249

}

1250

return true;

1251

}

1252

1253

/*

1254

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

1255

* corresponds to an acceptable network device.

1256

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

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

int good_interface(const struct dirent *if_entry){

1260

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

1261

return 0;

1262

}

1263

1264

struct ifreq ifr;

1265

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

1266

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1275

}

1276

return 1;

1277

}

1278

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

int notdotentries(const struct dirent *direntry){

1315

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

1316

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

1317

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

1318

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

1319

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

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1327

int runnable_hook(const struct dirent *direntry){

1328

int ret;

1329

size_t sret;

1330

struct stat st;

1331

1332

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

1333

/* Empty name? */

1334

return 0;

1335

}

1336

1337

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

1338

"abcdefghijklmnopqrstuvwxyz"

1339

"0123456789"

1340

"_.-");

1341

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

1342

/* Contains non-allowed characters */

1343

if(debug){

1344

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

1345

direntry->d_name);

1346

}

1347

return 0;

1348

}

1349

1350

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

1351

if(ret == -1){

1352

if(debug){

1353

perror_plus("Could not stat hook");

1354

}

1355

return 0;

1356

}

1357

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

1358

/* Not a regular file */

1359

if(debug){

1360

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

1361

direntry->d_name);

1362

}

1363

return 0;

1364

}

1365

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

1366

/* Not executable */

1367

if(debug){

1368

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

1369

direntry->d_name);

1370

}

1371

return 0;

1372

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

return 1;

1378

}

1379

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1383

int ret;

1384

struct timespec now;

1385

struct timespec waited_time;

1386

intmax_t block_time;

1387

1388

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1393

}

1394

ret = avahi_simple_poll_iterate(s, -1);

1395

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1399

}

1400

/* the current time */

1401

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1402

if(ret == -1){

1403

perror_plus("clock_gettime");

1404

return -1;

1405

}

1406

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

1407

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

1408

waited_time.tv_sec = (now.tv_sec

1409

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

1410

waited_time.tv_nsec = (now.tv_nsec

1411

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

1412

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

1413

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

1414

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

1415

block_time = ((retry_interval

1416

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

1417

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

1418

1419

if(debug){

1420

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

1421

block_time);

1422

}

1423

1424

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1429

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1431

return 0;

1432

}

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1435

if(ret == -1){

1436

perror_plus("clock_gettime");

1437

return -1;

1438

}

1439

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

1440

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

1441

servers, but don't block */

1442

}

1443

1444

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

1445

}

1446

if(ret != 0){

1447

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

1448

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

1449

}

1450

}

1451

}

1452

}

1453

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

}

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

1466

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

1467

__attribute__((warn_unused_result))

1468

error_t raise_privileges_permanently(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = raise_privileges();

1471

if(ret_errno != 0){

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

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

1476

ret_errno = errno;

1477

}

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

1482

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

1483

__attribute__((warn_unused_result))

1484

error_t lower_privileges(void){

1485

error_t old_errno = errno;

1486

error_t ret_errno = 0;

1487

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

1488

ret_errno = errno;

1489

}

1490

errno = old_errno;

1491

return ret_errno;

1492

}

1493

1494

/* Lower privileges permanently */

1495

__attribute__((warn_unused_result))

1496

error_t lower_privileges_permanently(void){

1497

error_t old_errno = errno;

1498

error_t ret_errno = 0;

1499

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

1500

ret_errno = errno;

1501

}

1502

errno = old_errno;

1503

return ret_errno;

1504

}

1505

1506

__attribute__((nonnull))

1507

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

1508

const float delay){

1509

struct dirent **direntries = NULL;

1510

if(hookdir_fd == -1){

1511

hookdir_fd = open(hookdir, O_RDONLY);

1512

if(hookdir_fd == -1){

1513

if(errno == ENOENT){

1514

if(debug){

1515

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

1516

" found\n", hookdir);

1517

}

1518

} else {

1519

perror_plus("open");

1520

}

1521

return;

1522

}

1523

}

1524

#ifdef __GLIBC__

1525

#if __GLIBC_PREREQ(2, 15)

1526

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

1527

runnable_hook, alphasort);

1528

#else /* not __GLIBC_PREREQ(2, 15) */

1529

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

1530

alphasort);

1531

#endif /* not __GLIBC_PREREQ(2, 15) */

1532

#else /* not __GLIBC__ */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC__ */

1536

if(numhooks == -1){

1537

perror_plus("scandir");

1538

return;

1539

}

1540

struct dirent *direntry;

1541

int ret;

1542

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

1543

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

1544

direntry = direntries[i];

1545

if(debug){

1546

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

1547

direntry->d_name);

1548

}

1549

pid_t hook_pid = fork();

1550

if(hook_pid == 0){

1551

/* Child */

1552

/* Raise privileges */

1553

errno = raise_privileges_permanently();

1554

if(errno != 0){

1555

perror_plus("Failed to raise privileges");

1556

_exit(EX_NOPERM);

1557

}

1558

/* Set group */

1559

errno = 0;

1560

ret = setgid(0);

1561

if(ret == -1){

1562

perror_plus("setgid");

1563

_exit(EX_NOPERM);

1564

}

1565

/* Reset supplementary groups */

1566

errno = 0;

1567

ret = setgroups(0, NULL);

1568

if(ret == -1){

1569

perror_plus("setgroups");

1570

_exit(EX_NOPERM);

1571

}

1572

ret = dup2(devnull, STDIN_FILENO);

1573

if(ret == -1){

1574

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

1575

_exit(EX_OSERR);

1576

}

1577

ret = close(devnull);

1578

if(ret == -1){

1579

perror_plus("close");

1580

_exit(EX_OSERR);

1581

}

1582

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("setenv");

1590

_exit(EX_OSERR);

1591

}

1592

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

1593

if(ret == -1){

1594

perror_plus("setenv");

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

char *delaystring;

1608

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

1609

if(ret == -1){

1610

perror_plus("asprintf");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

free(delaystring);

1616

perror_plus("setenv");

1617

_exit(EX_OSERR);

1618

}

1619

free(delaystring);

1620

if(connect_to != NULL){

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

_exit(EX_OSERR);

1625

}

1626

}

1627

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1628

if(hook_fd == -1){

1629

perror_plus("openat");

1630

_exit(EXIT_FAILURE);

1631

}

1632

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

1633

perror_plus("close");

1634

_exit(EXIT_FAILURE);

1635

}

1636

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

1637

environ) == -1){

1638

perror_plus("fexecve");

1639

_exit(EXIT_FAILURE);

1640

}

1641

} else {

1642

int status;

1643

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

1644

perror_plus("waitpid");

1645

continue;

1646

}

1647

if(WIFEXITED(status)){

1648

if(WEXITSTATUS(status) != 0){

1649

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

1650

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

1651

WEXITSTATUS(status));

1652

continue;

1653

}

1654

} else if(WIFSIGNALED(status)){

1655

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

1656

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

1657

WTERMSIG(status));

1658

continue;

1659

} else {

1660

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

1661

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

1662

continue;

1663

}

1664

}

1665

if(debug){

1666

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

1667

direntry->d_name);

1668

}

1669

}

1670

free(direntries);

1671

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

1672

perror_plus("close");

1673

} else {

1674

hookdir_fd = -1;

1675

}

1676

close(devnull);

1677

}

1678

1679

__attribute__((nonnull, warn_unused_result))

1680

error_t bring_up_interface(const char *const interface,

1681

const float delay){

1682

error_t old_errno = errno;

1683

int ret;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

1692

if(quit_now){

1693

errno = old_errno;

1694

return EINTR;

1695

}

1696

1697

if(not interface_is_up(interface)){

1698

error_t ret_errno = 0, ioctl_errno = 0;

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

errno = old_errno;

1704

return ret_errno;

1705

}

1706

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

1707

1708

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

1709

if(sd == -1){

1710

ret_errno = errno;

1711

perror_plus("socket");

1712

errno = old_errno;

1713

return ret_errno;

1714

}

1715

1716

if(quit_now){

1717

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

1718

if(ret == -1){

1719

perror_plus("close");

1720

}

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(debug){

1726

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

1727

interface);

1728

}

1729

1730

/* Raise privileges */

1731

ret_errno = raise_privileges();

1732

if(ret_errno != 0){

1733

errno = ret_errno;

1734

perror_plus("Failed to raise privileges");

1735

}

1736

1737

#ifdef __linux__

1738

int ret_linux;

1739

bool restore_loglevel = false;

1740

if(ret_errno == 0){

1741

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1742

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

1743

ret_linux = klogctl(8, NULL, 5);

1744

if(ret_linux == -1){

1745

perror_plus("klogctl");

1746

} else {

1747

restore_loglevel = true;

1748

}

1749

}

1750

#endif /* __linux__ */

1751

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

1752

ioctl_errno = errno;

1753

#ifdef __linux__

1754

if(restore_loglevel){

1755

ret_linux = klogctl(7, NULL, 0);

1756

if(ret_linux == -1){

1757

perror_plus("klogctl");

1758

}

1759

}

1760

#endif /* __linux__ */

1761

1762

/* If raise_privileges() succeeded above */

1763

if(ret_errno == 0){

1764

/* Lower privileges */

1765

ret_errno = lower_privileges();

1766

if(ret_errno != 0){

1767

errno = ret_errno;

1768

perror_plus("Failed to lower privileges");

1769

}

1770

}

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ioctl_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1781

errno = old_errno;

1782

return ioctl_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

/* Sleep checking until interface is running.

1790

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

1791

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

1792

if(interface_is_running(interface)){

1793

break;

1794

}

1795

struct timespec sleeptime = { .tv_nsec = 250000000 };

1796

ret = nanosleep(&sleeptime, NULL);

1797

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

1798

perror_plus("nanosleep");

1799

}

1800

}

1801

1802

errno = old_errno;

1803

return 0;

1804

}

1805

1806

__attribute__((nonnull, warn_unused_result))

1807

error_t take_down_interface(const char *const interface){

1808

error_t old_errno = errno;

1809

struct ifreq network;

1810

unsigned int if_index = if_nametoindex(interface);

1811

if(if_index == 0){

1812

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

1813

errno = old_errno;

1814

return ENXIO;

1815

}

1816

if(interface_is_up(interface)){

1817

error_t ret_errno = 0, ioctl_errno = 0;

1818

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

1819

ret_errno = errno;

1820

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

1821

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

1822

errno = old_errno;

1823

return ret_errno;

1824

}

1825

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

1826

1827

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

1828

if(sd == -1){

1829

ret_errno = errno;

1830

perror_plus("socket");

1831

errno = old_errno;

1832

return ret_errno;

1833

}

1834

1835

if(debug){

1836

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

1837

interface);

1838

}

1839

1840

/* Raise privileges */

1841

ret_errno = raise_privileges();

1842

if(ret_errno != 0){

1843

errno = ret_errno;

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1021

1879

}

1022

1880

1023

1881

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1024

1886

AvahiSServiceBrowser *sb = NULL;

1025

int error;

1887

error_t ret_errno;

1026

1888

int ret;

1027

1889

intmax_t tmpmax;

1028

1890

char *tmp;

1029

1891

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

1039

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

1898

const char *seckey = PATHDIR "/" SECKEY;

1041

1899

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1042

1901

1043

1902

bool gnutls_initialized = false;

1044

1903

bool gpgme_initialized = false;

1045

1904

float delay = 2.5f;

1905

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

1906

retrying the same server again */

1046

1907

1047

1908

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1909

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1915

errno = 0;

1055

1916

ret = setgid(gid);

1056

1917

if(ret == -1){

1057

perror("setgid");

1918

perror_plus("setgid");

1058

1919

}

1059

1920

1060

1921

/* Lower user privileges (temporarily) */

1061

1922

errno = 0;

1062

1923

ret = seteuid(uid);

1063

1924

if(ret == -1){

1064

perror("seteuid");

1925

perror_plus("seteuid");

1065

1926

}

1066

1927

1067

1928

if(quit_now){

1102

1963

.arg = "SECONDS",

1103

1964

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

1104

1965

.group = 2 },

1966

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

1967

.arg = "SECONDS",

1968

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

1969

.group = 2 },

1970

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

1971

.arg = "DIR",

1972

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

1973

.group = 2 },

1105

1974

/*

1106

1975

* These reproduce what we would get without ARGP_NO_HELP

1107

1976

*/

1125

1994

connect_to = arg;

1126

1995

break;

1127

1996

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

1128

interface = arg;

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1129

2002

break;

1130

2003

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

1131

2004

seckey = arg;

1151

2024

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

1152

2025

argp_error(state, "Bad delay");

1153

2026

}

2027

case 132: /* --retry */

2028

errno = 0;

2029

retry_interval = strtod(arg, &tmp);

2030

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

2031

or (retry_interval * 1000) > INT_MAX

2032

or retry_interval < 0){

2033

argp_error(state, "Bad retry interval");

2034

}

2035

break;

2036

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

2037

hookdir = arg;

1154

2038

break;

1155

2039

/*

1156

2040

* These reproduce what we would get without ARGP_NO_HELP

1163

2047

argp_state_help(state, state->out_stream,

1164

2048

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2049

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

1166

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

2050

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

1167

2051

exit(argp_err_exit_status);

1168

2052

break;

1169

2053

default:

1184

2068

case ENOMEM:

1185

2069

default:

1186

2070

errno = ret;

1187

perror("argp_parse");

2071

perror_plus("argp_parse");

1188

2072

exitcode = EX_OSERR;

1189

2073

goto end;

1190

2074

case EINVAL:

1192

2076

goto end;

1193

2077

}

1194

2078

}

2079

2080

{

2081

/* Work around Debian bug #633582:

2082

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

2083

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

2090

struct stat st;

2091

2092

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

2093

int seckey_fd = open(seckey, O_RDONLY);

2094

if(seckey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(seckey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2110

}

2111

}

2112

2113

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

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2115

if(pubkey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(pubkey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2134

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

2156

}

2157

}

2158

}

2159

2160

/* Run network hooks */

2161

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

2173

}

1195

2174

1196

2175

if(not debug){

1197

2176

avahi_set_log_function(empty_log);

1201

2180

from the signal handler */

1202

2181

/* Initialize the pseudo-RNG for Avahi */

1203

2182

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

2185

fprintf_plus(stderr,

2186

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

1207

2187

exitcode = EX_UNAVAILABLE;

1208

2188

goto end;

1209

2189

}

1211

2191

sigemptyset(&sigterm_action.sa_mask);

1212

2192

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

1213

2193

if(ret == -1){

1214

perror("sigaddset");

2194

perror_plus("sigaddset");

1215

2195

exitcode = EX_OSERR;

1216

2196

goto end;

1217

2197

}

1218

2198

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

1219

2199

if(ret == -1){

1220

perror("sigaddset");

2200

perror_plus("sigaddset");

1221

2201

exitcode = EX_OSERR;

1222

2202

goto end;

1223

2203

}

1224

2204

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

1225

2205

if(ret == -1){

1226

perror("sigaddset");

2206

perror_plus("sigaddset");

1227

2207

exitcode = EX_OSERR;

1228

2208

goto end;

1229

2209

}

1233

2213

*/

1234

2214

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

1235

2215

if(ret == -1){

1236

perror("sigaction");

2216

perror_plus("sigaction");

1237

2217

return EX_OSERR;

1238

2218

}

1239

2219

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2220

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

1241

2221

if(ret == -1){

1242

perror("sigaction");

2222

perror_plus("sigaction");

1243

2223

exitcode = EX_OSERR;

1244

2224

goto end;

1245

2225

}

1246

2226

}

1247

2227

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

1248

2228

if(ret == -1){

1249

perror("sigaction");

2229

perror_plus("sigaction");

1250

2230

return EX_OSERR;

1251

2231

}

1252

2232

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2233

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

1254

2234

if(ret == -1){

1255

perror("sigaction");

2235

perror_plus("sigaction");

1256

2236

exitcode = EX_OSERR;

1257

2237

goto end;

1258

2238

}

1259

2239

}

1260

2240

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

1261

2241

if(ret == -1){

1262

perror("sigaction");

2242

perror_plus("sigaction");

1263

2243

return EX_OSERR;

1264

2244

}

1265

2245

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2246

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

1267

2247

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2248

perror_plus("sigaction");

2249

exitcode = EX_OSERR;

2250

goto end;

2251

}

2252

}

2253

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

2276

} else {

2277

if(ret == 0){

2278

free(direntries);

2279

}

2280

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

2281

exitcode = EXIT_FAILURE;

2282

goto end;

2283

}

2284

}

2285

2286

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

2287

{

2288

char *interface = NULL;

2289

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

2290

interface))){

2291

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

2292

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

2293

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

2294

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

2295

interface);

2296

interface = NULL;

2297

while((interface = argz_next(mc.interfaces,

2298

mc.interfaces_size, interface))){

2299

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

2300

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

2301

interface);

2302

interface = NULL;

1359

2303

}

1360

2304

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2305

break;

1378

2306

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2307

bool interface_was_up = interface_is_up(interface);

2308

errno = bring_up_interface(interface, delay);

2309

if(not interface_was_up){

2310

if(errno != 0){

2311

perror_plus("Failed to bring up interface");

2312

} else {

2313

errno = argz_add(&interfaces_to_take_down,

2314

&interfaces_to_take_down_size,

2315

interface);

2316

if(errno != 0){

2317

perror_plus("argz_add");

2318

}

2319

}

2320

}

2321

}

2322

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

2323

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

2324

}

2325

}

2326

2327

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

2328

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

2329

if(debug){

2330

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

2331

mc.interfaces);

2332

}

2333

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

1416

2334

}

1417

2335

1418

2336

if(quit_now){

1419

2337

goto end;

1420

2338

}

1421

2339

1422

ret = init_gnutls_global(pubkey, seckey);

2340

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

1423

2341

if(ret == -1){

1424

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

2342

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

1425

2343

exitcode = EX_UNAVAILABLE;

1426

2344

goto end;

1427

2345

} else {

1432

2350

goto end;

1433

2351

}

1434

2352

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2353

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

2354

tempdir = mkdtemp(run_tempdir);

2355

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

2356

if(debug){

2357

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

2358

run_tempdir, old_tempdir);

2359

}

2360

tempdir = mkdtemp(old_tempdir);

2361

}

2362

if(tempdir == NULL){

2363

perror_plus("mkdtemp");

1439

2364

goto end;

1440

2365

}

1441

2366

1443

2368

goto end;

1444

2369

}

1445

2370

1446

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

1447

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

2371

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

2372

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

1448

2373

exitcode = EX_UNAVAILABLE;

1449

2374

goto end;

1450

2375

} else {

1459

2384

/* Connect directly, do not use Zeroconf */

1460

2385

/* (Mainly meant for debugging) */

1461

2386

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

2387

1462

2388

if(address == NULL){

1463

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

2389

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

1464

2390

exitcode = EX_USAGE;

1465

2391

goto end;

1466

2392

}

1469

2395

goto end;

1470

2396

}

1471

2397

1472

uint16_t port;

2398

in_port_t port;

1473

2399

errno = 0;

1474

2400

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

1475

2401

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2402

or tmpmax != (in_port_t)tmpmax){

2403

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

1478

2404

exitcode = EX_USAGE;

1479

2405

goto end;

1480

2406

}

1481

2407

1482

2408

if(quit_now){

1483

2409

goto end;

1484

2410

}

1485

2411

1486

port = (uint16_t)tmpmax;

2412

port = (in_port_t)tmpmax;

1487

2413

*address = '\0';

1488

address = connect_to;

1489

2414

/* Colon in address indicates IPv6 */

1490

2415

int af;

1491

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

2416

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

1492

2417

af = AF_INET6;

2418

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

2419

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

2420

{

2421

connect_to++;

2422

address[-1] = '\0';

2423

}

1493

2424

} else {

1494

2425

af = AF_INET;

1495

2426

}

2427

address = connect_to;

1496

2428

1497

2429

if(quit_now){

1498

2430

goto end;

1499

2431

}

1500

2432

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2433

while(not quit_now){

2434

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

2435

&mc);

2436

if(quit_now or ret == 0){

2437

break;

2438

}

2439

if(debug){

2440

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

2441

(int)retry_interval);

2442

}

2443

sleep((unsigned int)retry_interval);

2444

}

2445

2446

if(not quit_now){

1523

2447

exitcode = EXIT_SUCCESS;

1524

2448

}

2449

1525

2450

goto end;

1526

2451

}

1527

2452

1539

2464

config.publish_domain = 0;

1540

2465

1541

2466

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

1545

2469

1546

2470

/* Free the Avahi configuration data */

1547

2471

avahi_server_config_free(&config);

1549

2473

1550

2474

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

1551

2475

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2476

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

2477

avahi_strerror(ret_errno));

1554

2478

exitcode = EX_UNAVAILABLE;

1555

2479

goto end;

1556

2480

}

1562

2486

/* Create the Avahi service browser */

1563

2487

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2488

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

1566

2491

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2492

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

2493

avahi_strerror(avahi_server_errno(mc.server)));

1569

2494

exitcode = EX_UNAVAILABLE;

1570

2495

goto end;

1571

2496

}

1577

2502

/* Run the main loop */

1578

2503

1579

2504

if(debug){

1580

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

2505

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

1581

2506

}

1582

2507

1583

avahi_simple_poll_loop(mc.simple_poll);

2508

ret = avahi_loop_with_timeout(simple_poll,

2509

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

2510

if(debug){

2511

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

2512

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

2513

}

1584

2514

1585

2515

end:

1586

2516

1587

2517

if(debug){

1588

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

2518

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

1589

2519

}

1590

2520

1591

2521

/* Cleanup things */

2522

free(mc.interfaces);

2523

1592

2524

if(sb != NULL)

1593

2525

avahi_s_service_browser_free(sb);

1594

2526

1595

2527

if(mc.server != NULL)

1596

2528

avahi_server_free(mc.server);

1597

2529

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

1600

2532

1601

2533

if(gnutls_initialized){

1602

2534

gnutls_certificate_free_credentials(mc.cred);

1608

2540

gpgme_release(mc.ctx);

1609

2541

}

1610

2542

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

2543

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

2544

has seen */

2545

if(mc.current_server != NULL){

2546

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

2547

while(mc.current_server != NULL){

2548

server *next = mc.current_server->next;

2549

free(mc.current_server);

2550

mc.current_server = next;

2551

}

2552

}

2553

2554

/* Re-raise privileges */

2555

{

2556

ret_errno = raise_privileges();

2557

if(ret_errno != 0){

2558

errno = ret_errno;

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2583

}

2584

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2589

}

2590

}

2591

2592

free(interfaces_to_take_down);

2593

free(interfaces_hooks);

2594

2595

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

2596

if(tempdir != NULL){

2597

struct dirent **direntries = NULL;

2598

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2599

O_NOFOLLOW));

2600

if(tempdir_fd == -1){

2601

perror_plus("open");

2602

} else {

2603

#ifdef __GLIBC__

2604

#if __GLIBC_PREREQ(2, 15)

2605

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

2606

notdotentries, alphasort);

2607

#else /* not __GLIBC_PREREQ(2, 15) */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC_PREREQ(2, 15) */

2611

#else /* not __GLIBC__ */

2612

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

2613

alphasort);

2614

#endif /* not __GLIBC__ */

2615

if(numentries >= 0){

2616

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

2617

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2618

if(ret == -1){

2619

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2620

" \"%s\", 0): %s\n", tempdir,

2621

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

2622

}

2623

}

2624

2625

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

2626

free(direntries);

2627

if(numentries == -1){

2628

perror_plus("scandir");

2629

}

2630

ret = rmdir(tempdir);

2631

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

2632

perror_plus("rmdir");

2633

}

2634

}

2635

TEMP_FAILURE_RETRY(close(tempdir_fd));

1684

2636

}

1685

2637

}

1686

2638

1691

2643

&old_sigterm_action,

1692

2644

NULL));

1693

2645

if(ret == -1){

1694

perror("sigaction");

2646

perror_plus("sigaction");

1695

2647

}

1696

2648

do {

1697

2649

ret = raise(signal_received);

1698

2650

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

1699

2651

if(ret != 0){

1700

perror("raise");

2652

perror_plus("raise");

1701

2653

abort();

1702

2654

}

1703

2655

TEMP_FAILURE_RETRY(pause());