/mandos/release : revision 237.2.175

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() */

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() */

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,

66

program_invocation_short_name */

67

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

64

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

73

72

*/

74

73

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

75

74

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

76

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

77

unlinkat() */

78

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

75

setgid(), pause() */

76

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

79

77

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

80

78

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

81

79

argp_state, struct argp,

86

84

raise() */

87

85

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

88

86

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() */

98

87

99

88

#ifdef __linux__

100

89

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

118

107

init_gnutls_session(),

119

108

GNUTLS_* */

120

109

#include <gnutls/openpgp.h>

121

/* gnutls_certificate_set_openpgp_key_file(),

122

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

123

112

124

113

/* GPGME */

125

114

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

133

122

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

134

123

#define SECKEY "seckey.txt"

135

124

#define PUBKEY "pubkey.txt"

136

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

137

125

138

126

bool debug = false;

139

127

static const char mandos_protocol_version[] = "1";

140

128

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

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;

129

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

159

130

160

131

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

161

132

typedef struct {

133

AvahiSimplePoll *simple_poll;

162

134

AvahiServer *server;

163

135

gnutls_certificate_credentials_t cred;

164

136

unsigned int dh_bits;

165

137

gnutls_dh_params_t dh_params;

166

138

const char *priority;

167

139

gpgme_ctx_t ctx;

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

140

} mandos_context;

172

141

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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" };

175

146

176

147

sig_atomic_t quit_now = 0;

177

148

int signal_received = 0;

178

149

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

198

150

/*

199

151

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

200

152

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

201

153

* "buffer_length" is how much is already used.

202

154

*/

203

__attribute__((nonnull, warn_unused_result))

204

155

size_t incbuffer(char **buffer, size_t buffer_length,

205

size_t buffer_capacity){

156

size_t buffer_capacity){

206

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

158

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

159

if(buffer == NULL){

213

160

return 0;

214

161

}

215

*buffer = new_buf;

216

162

buffer_capacity += BUFFER_SIZE;

217

163

}

218

164

return buffer_capacity;

219

165

}

220

166

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

259

167

/*

260

168

* Initialize GPGME.

261

169

*/

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){

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

267

172

gpgme_error_t rc;

268

173

gpgme_engine_info_t engine_info;

269

174

175

270

176

/*

271

177

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

272

178

*/

273

bool import_key(const char * const filename){

179

bool import_key(const char *filename){

274

180

int ret;

275

181

int fd;

276

182

gpgme_data_t pgp_data;

277

183

278

184

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

279

185

if(fd == -1){

280

perror_plus("open");

186

perror("open");

281

187

return false;

282

188

}

283

189

284

190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

285

191

if(rc != GPG_ERR_NO_ERROR){

286

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

287

gpgme_strsource(rc), gpgme_strerror(rc));

192

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

193

gpgme_strsource(rc), gpgme_strerror(rc));

288

194

return false;

289

195

}

290

196

291

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

292

198

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

295

201

return false;

296

202

}

297

203

298

204

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

299

205

if(ret == -1){

300

perror_plus("close");

206

perror("close");

301

207

}

302

208

gpgme_data_release(pgp_data);

303

209

return true;

304

210

}

305

211

306

212

if(debug){

307

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

213

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

308

214

}

309

215

310

216

/* Init GPGME */

311

217

gpgme_check_version(NULL);

312

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

313

219

if(rc != GPG_ERR_NO_ERROR){

314

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

316

222

return false;

317

223

}

318

224

319

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

225

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

320

226

rc = gpgme_get_engine_info(&engine_info);

321

227

if(rc != GPG_ERR_NO_ERROR){

322

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

324

230

return false;

325

231

}

326

232

while(engine_info != NULL){

332

238

engine_info = engine_info->next;

333

239

}

334

240

if(engine_info == NULL){

335

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

336

tempdir);

241

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

337

242

return false;

338

243

}

339

244

340

245

/* Create new GPGME "context" */

341

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

246

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

342

247

if(rc != GPG_ERR_NO_ERROR){

343

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

344

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

345

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

346

250

return false;

347

251

}

348

252

357

261

* Decrypt OpenPGP data.

358

262

* Returns -1 on error

359

263

*/

360

__attribute__((nonnull, warn_unused_result))

361

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

265

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

266

char **plaintext){

365

267

gpgme_data_t dh_crypto, dh_plain;

366

268

gpgme_error_t rc;

367

269

ssize_t ret;

369

271

ssize_t plaintext_length = 0;

370

272

371

273

if(debug){

372

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

274

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

373

275

}

374

276

375

277

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

376

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

377

279

0);

378

280

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

381

283

return -1;

382

284

}

383

285

384

286

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

385

287

rc = gpgme_data_new(&dh_plain);

386

288

if(rc != GPG_ERR_NO_ERROR){

387

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

390

291

gpgme_data_release(dh_crypto);

391

292

return -1;

392

293

}

393

294

394

295

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

395

296

data buffer */

396

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

297

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

397

298

if(rc != GPG_ERR_NO_ERROR){

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

400

301

plaintext_length = -1;

401

302

if(debug){

402

303

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

404

305

if(result == NULL){

405

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

306

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

406

307

} else {

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);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

411

312

if(result->file_name != NULL){

412

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

313

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

413

314

}

414

315

gpgme_recipient_t recipient;

415

316

recipient = result->recipients;

416

317

while(recipient != NULL){

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");

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");

424

324

recipient = recipient->next;

425

325

}

426

326

}

429

329

}

430

330

431

331

if(debug){

432

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

332

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

433

333

}

434

334

435

335

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

436

336

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

437

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

438

338

plaintext_length = -1;

439

339

goto decrypt_end;

440

340

}

442

342

*plaintext = NULL;

443

343

while(true){

444

344

plaintext_capacity = incbuffer(plaintext,

445

(size_t)plaintext_length,

446

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

447

347

if(plaintext_capacity == 0){

448

perror_plus("incbuffer");

449

plaintext_length = -1;

450

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

451

351

}

452

352

453

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

458

358

break;

459

359

}

460

360

if(ret < 0){

461

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

462

362

plaintext_length = -1;

463

363

goto decrypt_end;

464

364

}

466

366

}

467

367

468

368

if(debug){

469

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

369

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

470

370

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

471

371

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

472

372

}

483

383

return plaintext_length;

484

384

}

485

385

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

489

389

if(ret == NULL)

490

390

ret = "(unknown)";

491

391

return ret;

492

392

}

493

393

494

394

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

395

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

497

396

const char* string){

498

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

397

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

499

398

}

500

399

501

__attribute__((nonnull, warn_unused_result))

502

400

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

401

const char *seckeyfilename){

505

402

int ret;

506

403

507

404

if(debug){

508

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

405

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

509

406

}

510

407

511

408

ret = gnutls_global_init();

512

409

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

410

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

411

safer_gnutls_strerror(ret));

515

412

return -1;

516

413

}

517

414

524

421

}

525

422

526

423

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

528

425

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

531

431

gnutls_global_deinit();

532

432

return -1;

533

433

}

534

434

535

435

if(debug){

536

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

436

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

437

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

438

seckeyfilename);

540

439

}

541

440

542

441

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

544

443

GNUTLS_OPENPGP_FMT_BASE64);

545

444

if(ret != GNUTLS_E_SUCCESS){

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));

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));

551

450

goto globalfail;

552

451

}

553

452

554

453

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

454

ret = gnutls_dh_params_init(&mc.dh_params);

556

455

if(ret != GNUTLS_E_SUCCESS){

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

456

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

457

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

560

458

goto globalfail;

561

459

}

562

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

460

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

563

461

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

462

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

463

safer_gnutls_strerror(ret));

566

464

goto globalfail;

567

465

}

568

466

569

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

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

468

571

469

return 0;

572

470

573

471

globalfail:

574

472

575

gnutls_certificate_free_credentials(mc->cred);

473

gnutls_certificate_free_credentials(mc.cred);

576

474

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_dh_params_deinit(mc.dh_params);

578

476

return -1;

579

477

}

580

478

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

479

static int init_gnutls_session(gnutls_session_t *session){

584

480

int ret;

585

481

/* GnuTLS session creation */

586

482

do {

590

486

}

591

487

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

592

488

if(ret != GNUTLS_E_SUCCESS){

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

596

491

}

597

492

598

493

{

599

494

const char *err;

600

495

do {

601

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

496

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

602

497

if(quit_now){

603

498

gnutls_deinit(*session);

604

499

return -1;

605

500

}

606

501

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

607

502

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

611

506

gnutls_deinit(*session);

612

507

return -1;

613

508

}

615

510

616

511

do {

617

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

513

mc.cred);

619

514

if(quit_now){

620

515

gnutls_deinit(*session);

621

516

return -1;

622

517

}

623

518

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

624

519

if(ret != GNUTLS_E_SUCCESS){

625

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

626

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

627

522

gnutls_deinit(*session);

628

523

return -1;

629

524

}

631

526

/* ignore client certificate if any. */

632

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

528

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

530

636

531

return 0;

637

532

}

641

536

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

642

537

643

538

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

539

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

646

540

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

541

int af){

648

542

int ret, tcp_sd = -1;

649

543

ssize_t sret;

650

struct sockaddr_storage to;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

651

548

char *buffer = NULL;

652

549

char *decrypted_buffer = NULL;

653

550

size_t buffer_length = 0;

672

569

pf = PF_INET;

673

570

break;

674

571

default:

675

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

572

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

676

573

errno = EINVAL;

677

574

return -1;

678

575

}

679

576

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);

577

ret = init_gnutls_session(&session);

713

578

if(ret != 0){

714

579

return -1;

715

580

}

716

581

717

582

if(debug){

718

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

719

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

583

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

584

"\n", ip, port);

720

585

}

721

586

722

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

723

588

if(tcp_sd < 0){

724

589

int e = errno;

725

perror_plus("socket");

590

perror("socket");

726

591

errno = e;

727

592

goto mandos_end;

728

593

}

734

599

735

600

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

736

601

if(af == AF_INET6){

737

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

738

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

602

to.in6.sin6_family = (sa_family_t)af;

603

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

739

604

} else { /* IPv4 */

740

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

741

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

605

to.in.sin_family = (sa_family_t)af;

606

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

742

607

}

743

608

if(ret < 0 ){

744

609

int e = errno;

745

perror_plus("inet_pton");

610

perror("inet_pton");

746

611

errno = e;

747

612

goto mandos_end;

748

613

}

749

614

if(ret == 0){

750

615

int e = errno;

751

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

616

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

752

617

errno = e;

753

618

goto mandos_end;

754

619

}

755

620

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

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*/

759

628

if(if_index == AVAHI_IF_UNSPEC){

760

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

761

" incomplete without a network interface\n");

629

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

630

" without a network interface\n");

762

631

errno = EINVAL;

763

632

goto mandos_end;

764

633

}

765

634

/* Set the network interface number as scope */

766

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

635

to.in6.sin6_scope_id = (uint32_t)if_index;

767

636

}

768

637

} else {

769

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

638

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

639

-Wconversion and

640

-Wunreachable-code */

770

641

}

771

642

772

643

if(quit_now){

778

649

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

779

650

char interface[IF_NAMESIZE];

780

651

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

781

perror_plus("if_indextoname");

652

perror("if_indextoname");

782

653

} else {

783

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

784

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

654

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

655

ip, interface, port);

785

656

}

786

657

} else {

787

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

788

ip, (uintmax_t)port);

658

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

659

port);

789

660

}

790

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

792

664

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

665

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

666

sizeof(addrstr));

797

667

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

668

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

669

sizeof(addrstr));

802

670

}

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);

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

}

809

677

}

810

678

}

811

679

815

683

}

816

684

817

685

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

686

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

820

687

} else {

821

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

822

sizeof(struct sockaddr_in));

688

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

823

689

}

824

690

if(ret < 0){

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

691

int e = errno;

692

perror("connect");

693

errno = e;

830

694

goto mandos_end;

831

695

}

832

696

840

704

while(true){

841

705

size_t out_size = strlen(out);

842

706

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

843

out_size - written));

707

out_size - written));

844

708

if(ret == -1){

845

709

int e = errno;

846

perror_plus("write");

710

perror("write");

847

711

errno = e;

848

712

goto mandos_end;

849

713

}

866

730

}

867

731

868

732

if(debug){

869

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

733

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

870

734

}

871

735

872

736

if(quit_now){

874

738

goto mandos_end;

875

739

}

876

740

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);

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

742

883

743

if(quit_now){

884

744

errno = EINTR;

895

755

896

756

if(ret != GNUTLS_E_SUCCESS){

897

757

if(debug){

898

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

758

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

899

759

gnutls_perror(ret);

900

760

}

901

761

errno = EPROTO;

905

765

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

906

766

907

767

if(debug){

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

768

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

769

ip);

910

770

}

911

771

912

772

while(true){

917

777

}

918

778

919

779

buffer_capacity = incbuffer(&buffer, buffer_length,

920

buffer_capacity);

780

buffer_capacity);

921

781

if(buffer_capacity == 0){

922

782

int e = errno;

923

perror_plus("incbuffer");

783

perror("incbuffer");

924

784

errno = e;

925

785

goto mandos_end;

926

786

}

950

810

}

951

811

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

952

812

if(ret < 0){

953

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

954

"***\n");

813

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

955

814

gnutls_perror(ret);

956

815

errno = EPROTO;

957

816

goto mandos_end;

958

817

}

959

818

break;

960

819

default:

961

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

962

" encrypted session with Mandos server\n");

820

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

821

" encrypted session with Mandos server\n");

963

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

964

823

errno = EIO;

965

824

goto mandos_end;

970

829

}

971

830

972

831

if(debug){

973

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

832

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

974

833

}

975

834

976

835

if(quit_now){

988

847

989

848

if(buffer_length > 0){

990

849

ssize_t decrypted_buffer_size;

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

993

853

if(decrypted_buffer_size >= 0){

994

854

995

855

written = 0;

1005

865

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

1006

866

int e = errno;

1007

867

if(debug){

1008

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

1009

strerror(errno));

868

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

869

strerror(errno));

1010

870

}

1011

871

errno = e;

1012

872

goto mandos_end;

1031

891

if(e == 0){

1032

892

e = errno;

1033

893

}

1034

perror_plus("close");

894

perror("close");

1035

895

}

1036

896

gnutls_deinit(session);

1037

errno = e;

1038

897

if(quit_now){

1039

errno = EINTR;

898

e = EINTR;

1040

899

retval = -1;

1041

900

}

901

errno = e;

1042

902

}

1043

903

return retval;

1044

904

}

1045

905

1046

__attribute__((nonnull))

1047

906

static void resolve_callback(AvahiSServiceResolver *r,

1048

907

AvahiIfIndex interface,

1049

908

AvahiProtocol proto,

1057

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

918

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1064

921

1065

922

/* Called whenever a service has been resolved successfully or

1066

923

timed out */

1072

929

switch(event){

1073

930

default:

1074

931

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1080

935

break;

1081

936

1082

937

case AVAHI_RESOLVER_FOUND:

1084

939

char ip[AVAHI_ADDRESS_STR_MAX];

1085

940

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

1086

941

if(debug){

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);

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);

1090

945

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1095

948

if(ret == 0){

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

}

949

avahi_simple_poll_quit(mc.simple_poll);

1104

950

}

1105

951

}

1106

952

}

1116

962

const char *domain,

1117

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

964

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1123

967

1124

968

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

1125

969

is removed from the LAN */

1132

976

default:

1133

977

case AVAHI_BROWSER_FAILURE:

1134

978

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);

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1139

982

return;

1140

983

1141

984

case AVAHI_BROWSER_NEW:

1144

987

the callback function is called the Avahi server will free the

1145

988

resolver for us. */

1146

989

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)));

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)));

1155

995

break;

1156

996

1157

997

case AVAHI_BROWSER_REMOVE:

1160

1000

case AVAHI_BROWSER_ALL_FOR_NOW:

1161

1001

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1162

1002

if(debug){

1163

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

1164

" searching...\n");

1003

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

1165

1004

}

1166

1005

break;

1167

1006

}

1168

1007

}

1169

1008

1170

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

1009

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

1171

1010

static void handle_sigterm(int sig){

1172

1011

if(quit_now){

1173

1012

return;

1175

1014

quit_now = 1;

1176

1015

signal_received = sig;

1177

1016

int old_errno = 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;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1879

1021

}

1880

1022

1881

1023

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 };

1886

1024

AvahiSServiceBrowser *sb = NULL;

1887

error_t ret_errno;

1025

int error;

1888

1026

int ret;

1889

1027

intmax_t tmpmax;

1890

1028

char *tmp;

1891

1029

int exitcode = EXIT_SUCCESS;

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;

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;

1897

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

1040

const char *seckey = PATHDIR "/" SECKEY;

1899

1041

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1901

1042

1902

1043

bool gnutls_initialized = false;

1903

1044

bool gpgme_initialized = false;

1904

1045

float delay = 2.5f;

1905

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

1906

retrying the same server again */

1907

1046

1908

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1909

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1915

1054

errno = 0;

1916

1055

ret = setgid(gid);

1917

1056

if(ret == -1){

1918

perror_plus("setgid");

1057

perror("setgid");

1919

1058

}

1920

1059

1921

1060

/* Lower user privileges (temporarily) */

1922

1061

errno = 0;

1923

1062

ret = seteuid(uid);

1924

1063

if(ret == -1){

1925

perror_plus("seteuid");

1064

perror("seteuid");

1926

1065

}

1927

1066

1928

1067

if(quit_now){

1963

1102

.arg = "SECONDS",

1964

1103

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

1965

1104

.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 },

1974

1105

/*

1975

1106

* These reproduce what we would get without ARGP_NO_HELP

1976

1107

*/

1994

1125

connect_to = arg;

1995

1126

break;

1996

1127

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

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

}

1128

interface = arg;

2002

1129

break;

2003

1130

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

2004

1131

seckey = arg;

2024

1151

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

2025

1152

argp_error(state, "Bad delay");

2026

1153

}

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;

2038

1154

break;

2039

1155

/*

2040

1156

* These reproduce what we would get without ARGP_NO_HELP

2047

1163

argp_state_help(state, state->out_stream,

2048

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2049

1165

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

2050

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

1166

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

2051

1167

exit(argp_err_exit_status);

2052

1168

break;

2053

1169

default:

2068

1184

case ENOMEM:

2069

1185

default:

2070

1186

errno = ret;

2071

perror_plus("argp_parse");

1187

perror("argp_parse");

2072

1188

exitcode = EX_OSERR;

2073

1189

goto end;

2074

1190

case EINVAL:

2076

1192

goto end;

2077

1193

}

2078

1194

}

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

}

2174

1195

2175

1196

if(not debug){

2176

1197

avahi_set_log_function(empty_log);

2180

1201

from the signal handler */

2181

1202

/* Initialize the pseudo-RNG for Avahi */

2182

1203

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

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");

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");

2187

1207

exitcode = EX_UNAVAILABLE;

2188

1208

goto end;

2189

1209

}

2191

1211

sigemptyset(&sigterm_action.sa_mask);

2192

1212

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

2193

1213

if(ret == -1){

2194

perror_plus("sigaddset");

1214

perror("sigaddset");

2195

1215

exitcode = EX_OSERR;

2196

1216

goto end;

2197

1217

}

2198

1218

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

2199

1219

if(ret == -1){

2200

perror_plus("sigaddset");

1220

perror("sigaddset");

2201

1221

exitcode = EX_OSERR;

2202

1222

goto end;

2203

1223

}

2204

1224

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

2205

1225

if(ret == -1){

2206

perror_plus("sigaddset");

1226

perror("sigaddset");

2207

1227

exitcode = EX_OSERR;

2208

1228

goto end;

2209

1229

}

2213

1233

*/

2214

1234

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

2215

1235

if(ret == -1){

2216

perror_plus("sigaction");

1236

perror("sigaction");

2217

1237

return EX_OSERR;

2218

1238

}

2219

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

2220

1240

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

2221

1241

if(ret == -1){

2222

perror_plus("sigaction");

1242

perror("sigaction");

2223

1243

exitcode = EX_OSERR;

2224

1244

goto end;

2225

1245

}

2226

1246

}

2227

1247

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

2228

1248

if(ret == -1){

2229

perror_plus("sigaction");

1249

perror("sigaction");

2230

1250

return EX_OSERR;

2231

1251

}

2232

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

2233

1253

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

2234

1254

if(ret == -1){

2235

perror_plus("sigaction");

1255

perror("sigaction");

2236

1256

exitcode = EX_OSERR;

2237

1257

goto end;

2238

1258

}

2239

1259

}

2240

1260

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

2241

1261

if(ret == -1){

2242

perror_plus("sigaction");

1262

perror("sigaction");

2243

1263

return EX_OSERR;

2244

1264

}

2245

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

2246

1266

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

2247

1267

if(ret == -1){

2248

perror_plus("sigaction");

1268

perror("sigaction");

2249

1269

exitcode = EX_OSERR;

2250

1270

goto end;

2251

1271

}

2252

1272

}

2253

1273

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);

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");

1359

}

1360

}

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

break;

1378

}

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

}

2276

1409

} 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;

2303

}

2304

}

2305

break;

2306

}

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);

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2334

1416

}

2335

1417

2336

1418

if(quit_now){

2337

1419

goto end;

2338

1420

}

2339

1421

2340

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

1422

ret = init_gnutls_global(pubkey, seckey);

2341

1423

if(ret == -1){

2342

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

1424

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

2343

1425

exitcode = EX_UNAVAILABLE;

2344

1426

goto end;

2345

1427

} else {

2350

1432

goto end;

2351

1433

}

2352

1434

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");

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2364

1439

goto end;

2365

1440

}

2366

1441

2368

1443

goto end;

2369

1444

}

2370

1445

2371

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

2372

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

1446

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

1447

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

2373

1448

exitcode = EX_UNAVAILABLE;

2374

1449

goto end;

2375

1450

} else {

2384

1459

/* Connect directly, do not use Zeroconf */

2385

1460

/* (Mainly meant for debugging) */

2386

1461

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

2387

2388

1462

if(address == NULL){

2389

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

1463

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

2390

1464

exitcode = EX_USAGE;

2391

1465

goto end;

2392

1466

}

2395

1469

goto end;

2396

1470

}

2397

1471

2398

in_port_t port;

1472

uint16_t port;

2399

1473

errno = 0;

2400

1474

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

2401

1475

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

2402

or tmpmax != (in_port_t)tmpmax){

2403

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2404

1478

exitcode = EX_USAGE;

2405

1479

goto end;

2406

1480

}

2407

1481

2408

1482

if(quit_now){

2409

1483

goto end;

2410

1484

}

2411

1485

2412

port = (in_port_t)tmpmax;

1486

port = (uint16_t)tmpmax;

2413

1487

*address = '\0';

1488

address = connect_to;

2414

1489

/* Colon in address indicates IPv6 */

2415

1490

int af;

2416

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

1491

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

2417

1492

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

}

2424

1493

} else {

2425

1494

af = AF_INET;

2426

1495

}

2427

address = connect_to;

2428

1496

2429

1497

if(quit_now){

2430

1498

goto end;

2431

1499

}

2432

1500

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){

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 {

2447

1523

exitcode = EXIT_SUCCESS;

2448

1524

}

2449

2450

1525

goto end;

2451

1526

}

2452

1527

2464

1539

config.publish_domain = 0;

2465

1540

2466

1541

/* Allocate a new server */

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2469

1545

2470

1546

/* Free the Avahi configuration data */

2471

1547

avahi_server_config_free(&config);

2473

1549

2474

1550

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

2475

1551

if(mc.server == NULL){

2476

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

2477

avahi_strerror(ret_errno));

1552

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

1553

avahi_strerror(error));

2478

1554

exitcode = EX_UNAVAILABLE;

2479

1555

goto end;

2480

1556

}

2486

1562

/* Create the Avahi service browser */

2487

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

2488

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

1565

NULL, 0, browse_callback, NULL);

2491

1566

if(sb == NULL){

2492

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

2493

avahi_strerror(avahi_server_errno(mc.server)));

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2494

1569

exitcode = EX_UNAVAILABLE;

2495

1570

goto end;

2496

1571

}

2502

1577

/* Run the main loop */

2503

1578

2504

1579

if(debug){

2505

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

1580

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

2506

1581

}

2507

1582

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

}

1583

avahi_simple_poll_loop(mc.simple_poll);

2514

1584

2515

1585

end:

2516

1586

2517

1587

if(debug){

2518

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

1588

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

2519

1589

}

2520

1590

2521

1591

/* Cleanup things */

2522

free(mc.interfaces);

2523

2524

1592

if(sb != NULL)

2525

1593

avahi_s_service_browser_free(sb);

2526

1594

2527

1595

if(mc.server != NULL)

2528

1596

avahi_server_free(mc.server);

2529

1597

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2532

1600

2533

1601

if(gnutls_initialized){

2534

1602

gnutls_certificate_free_credentials(mc.cred);

2540

1608

gpgme_release(mc.ctx);

2541

1609

}

2542

1610

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));

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");

2636

1684

}

2637

1685

}

2638

1686

2643

1691

&old_sigterm_action,

2644

1692

NULL));

2645

1693

if(ret == -1){

2646

perror_plus("sigaction");

1694

perror("sigaction");

2647

1695

}

2648

1696

do {

2649

1697

ret = raise(signal_received);

2650

1698

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

2651

1699

if(ret != 0){

2652

perror_plus("raise");

1700

perror("raise");

2653

1701

abort();

2654

1702

}

2655

1703

TEMP_FAILURE_RETRY(pause());