/mandos/release : revision 237.15.3

9

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

10

*

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* Everything else is

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13

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*

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

16

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

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* along with this program. If not, see

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

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*

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

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

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

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#endif

36

#ifndef _FILE_OFFSET_BITS

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37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

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41

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42

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

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stdout, ferror(), sscanf(),

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remove() */

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stdout, ferror(), remove() */

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44

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

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45

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

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

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srand() */

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

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

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strtof(), abort() */

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

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49

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

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50

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

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

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

49

52

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

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53

sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(),

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DIR */

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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56

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

55

57

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

56

struct in6_addr, inet_pton(),

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connect() */

58

inet_pton(), connect() */

58

59

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

59

60

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

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61

*/

61

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

62

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

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strtoimax() */

62

64

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

63

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

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

65

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

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program_invocation_short_name */

67

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

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68

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

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69

SIOCSIFFLAGS, if_indextoname(),

67

70

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

71

#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

73

*/

69

74

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

70

getuid(), getgid(), setuid(),

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setgid() */

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

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

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

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setgid(), pause() */

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

78

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

74

79

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

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80

argp_state, struct argp,

76

81

argp_parse(), ARGP_KEY_ARG,

77

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

83

#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

85

raise() */

86

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

78

89

#ifdef __linux__

79

90

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

80

#endif

91

#endif /* __linux__ */

81

92

82

93

/* Avahi */

83

94

/* All Avahi types, constants and functions

112

123

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

113

124

#define SECKEY "seckey.txt"

114

125

#define PUBKEY "pubkey.txt"

126

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

115

127

116

128

bool debug = false;

117

129

static const char mandos_protocol_version[] = "1";

118

130

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

119

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

131

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

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

133

char *connect_to = NULL;

134

135

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

136

typedef struct server{

137

const char *ip;

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uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

120

145

121

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

122

147

typedef struct {

127

152

gnutls_dh_params_t dh_params;

128

153

const char *priority;

129

154

gpgme_ctx_t ctx;

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server *current_server;

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156

} mandos_context;

131

157

158

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

159

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

163

164

sig_atomic_t quit_now = 0;

165

int signal_received = 0;

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

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

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

132

174

/*

133

* Make room in "buffer" for at least BUFFER_SIZE additional bytes.

134

* "buffer_capacity" is how much is currently allocated,

175

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

176

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

135

177

* "buffer_length" is how much is already used.

136

178

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

179

size_t incbuffer(char **buffer, size_t buffer_length,

138

180

size_t buffer_capacity){

139

181

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

182

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

146

188

return buffer_capacity;

147

189

}

148

190

191

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

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

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

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

215

} else {

216

new_server->next = mc.current_server;

217

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

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

149

229

/*

150

230

* Initialize GPGME.

151

231

*/

152

static bool init_gpgme(mandos_context *mc, const char *seckey,

232

static bool init_gpgme(const char *seckey,

153

233

const char *pubkey, const char *tempdir){

154

int ret;

155

234

gpgme_error_t rc;

156

235

gpgme_engine_info_t engine_info;

157

236

160

239

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

161

240

*/

162

241

bool import_key(const char *filename){

242

int ret;

163

243

int fd;

164

244

gpgme_data_t pgp_data;

165

245

166

246

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

167

247

if(fd == -1){

168

perror("open");

248

perror_plus("open");

169

249

return false;

170

250

}

171

251

176

256

return false;

177

257

}

178

258

179

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

259

rc = gpgme_op_import(mc.ctx, pgp_data);

180

260

if(rc != GPG_ERR_NO_ERROR){

181

261

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

182

262

gpgme_strsource(rc), gpgme_strerror(rc));

185

265

186

266

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

187

267

if(ret == -1){

188

perror("close");

268

perror_plus("close");

189

269

}

190

270

gpgme_data_release(pgp_data);

191

271

return true;

192

272

}

193

273

194

274

if(debug){

195

fprintf(stderr, "Initialize gpgme\n");

275

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

196

276

}

197

277

198

278

/* Init GPGME */

204

284

return false;

205

285

}

206

286

207

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

287

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

208

288

rc = gpgme_get_engine_info(&engine_info);

209

289

if(rc != GPG_ERR_NO_ERROR){

210

290

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

225

305

}

226

306

227

307

/* Create new GPGME "context" */

228

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

308

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

229

309

if(rc != GPG_ERR_NO_ERROR){

230

310

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

231

311

gpgme_strsource(rc), gpgme_strerror(rc));

236

316

return false;

237

317

}

238

318

239

return true;

319

return true;

240

320

}

241

321

242

322

/*

243

323

* Decrypt OpenPGP data.

244

324

* Returns -1 on error

245

325

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

326

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

327

size_t crypto_size,

249

328

char **plaintext){

250

329

gpgme_data_t dh_crypto, dh_plain;

277

356

278

357

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

279

358

data buffer */

280

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

359

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

281

360

if(rc != GPG_ERR_NO_ERROR){

282

361

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

283

362

gpgme_strsource(rc), gpgme_strerror(rc));

284

363

plaintext_length = -1;

285

364

if(debug){

286

365

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

288

367

if(result == NULL){

289

368

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

290

369

} else {

297

376

}

298

377

gpgme_recipient_t recipient;

299

378

recipient = result->recipients;

300

if(recipient){

301

while(recipient != NULL){

302

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

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

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

305

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

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

379

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

386

recipient = recipient->next;

310

387

}

311

388

}

312

389

}

319

396

320

397

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

321

398

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

322

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

323

400

plaintext_length = -1;

324

401

goto decrypt_end;

325

402

}

326

403

327

404

*plaintext = NULL;

328

405

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

406

plaintext_capacity = incbuffer(plaintext,

330

407

(size_t)plaintext_length,

331

408

plaintext_capacity);

332

409

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

410

perror_plus("incbuffer");

334

411

plaintext_length = -1;

335

412

goto decrypt_end;

336

413

}

343

420

break;

344

421

}

345

422

if(ret < 0){

346

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

347

424

plaintext_length = -1;

348

425

goto decrypt_end;

349

426

}

382

459

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

383

460

}

384

461

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

462

static int init_gnutls_global(const char *pubkeyfilename,

387

463

const char *seckeyfilename){

388

464

int ret;

389

465

407

483

}

408

484

409

485

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

411

487

if(ret != GNUTLS_E_SUCCESS){

412

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

413

* from

414

* -Wunreachable-code

415

*/

488

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

416

489

safer_gnutls_strerror(ret));

417

490

gnutls_global_deinit();

418

491

return -1;

425

498

}

426

499

427

500

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

429

502

GNUTLS_OPENPGP_FMT_BASE64);

430

503

if(ret != GNUTLS_E_SUCCESS){

431

504

fprintf(stderr,

437

510

}

438

511

439

512

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

513

ret = gnutls_dh_params_init(&mc.dh_params);

441

514

if(ret != GNUTLS_E_SUCCESS){

442

515

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

443

516

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

444

517

goto globalfail;

445

518

}

446

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

519

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

447

520

if(ret != GNUTLS_E_SUCCESS){

448

521

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

449

522

safer_gnutls_strerror(ret));

450

523

goto globalfail;

451

524

}

452

525

453

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

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

527

455

528

return 0;

456

529

457

530

globalfail:

458

531

459

gnutls_certificate_free_credentials(mc->cred);

532

gnutls_certificate_free_credentials(mc.cred);

460

533

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

534

gnutls_dh_params_deinit(mc.dh_params);

462

535

return -1;

463

536

}

464

537

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

538

static int init_gnutls_session(gnutls_session_t *session){

467

539

int ret;

468

540

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

541

do {

542

ret = gnutls_init(session, GNUTLS_SERVER);

543

if(quit_now){

544

return -1;

545

}

546

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

470

547

if(ret != GNUTLS_E_SUCCESS){

471

548

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

472

549

safer_gnutls_strerror(ret));

474

551

475

552

{

476

553

const char *err;

477

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

554

do {

555

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

556

if(quit_now){

557

gnutls_deinit(*session);

558

return -1;

559

}

560

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

478

561

if(ret != GNUTLS_E_SUCCESS){

479

562

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

480

563

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

484

567

}

485

568

}

486

569

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

570

do {

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

573

if(quit_now){

574

gnutls_deinit(*session);

575

return -1;

576

}

577

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

489

578

if(ret != GNUTLS_E_SUCCESS){

490

579

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

491

580

safer_gnutls_strerror(ret));

494

583

}

495

584

496

585

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

587

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

589

502

590

return 0;

503

591

}

509

597

/* Called when a Mandos server is found */

510

598

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

511

599

AvahiIfIndex if_index,

512

mandos_context *mc){

513

int ret, tcp_sd;

600

int af){

601

int ret, tcp_sd = -1;

514

602

ssize_t sret;

515

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

516

607

char *buffer = NULL;

517

char *decrypted_buffer;

608

char *decrypted_buffer = NULL;

518

609

size_t buffer_length = 0;

519

610

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

521

611

size_t written;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

612

int retval = -1;

524

613

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &session);

614

int pf; /* Protocol family */

615

616

errno = 0;

617

618

if(quit_now){

619

errno = EINTR;

620

return -1;

621

}

622

623

switch(af){

624

case AF_INET6:

625

pf = PF_INET6;

626

break;

627

case AF_INET:

628

pf = PF_INET;

629

break;

630

default:

631

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

632

errno = EINVAL;

633

return -1;

634

}

635

636

ret = init_gnutls_session(&session);

527

637

if(ret != 0){

528

638

return -1;

529

639

}

530

640

531

641

if(debug){

532

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

642

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

533

643

"\n", ip, port);

534

644

}

535

645

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

647

if(tcp_sd < 0){

538

perror("socket");

539

return -1;

648

int e = errno;

649

perror_plus("socket");

650

errno = e;

651

goto mandos_end;

540

652

}

541

653

542

if(debug){

543

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

544

perror("if_indextoname");

545

return -1;

546

}

547

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

654

if(quit_now){

655

errno = EINTR;

656

goto mandos_end;

548

657

}

549

658

550

659

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

551

to.in6.sin6_family = AF_INET6;

552

/* It would be nice to have a way to detect if we were passed an

553

IPv4 address here. Now we assume an IPv6 address. */

554

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

660

if(af == AF_INET6){

661

to.in6.sin6_family = (sa_family_t)af;

662

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

663

} else { /* IPv4 */

664

to.in.sin_family = (sa_family_t)af;

665

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

666

}

555

667

if(ret < 0 ){

556

perror("inet_pton");

557

return -1;

668

int e = errno;

669

perror_plus("inet_pton");

670

errno = e;

671

goto mandos_end;

558

672

}

559

673

if(ret == 0){

674

int e = errno;

560

675

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

561

return -1;

676

errno = e;

677

goto mandos_end;

562

678

}

563

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

679

if(af == AF_INET6){

680

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

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

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

686

-Wunreachable-code*/

687

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

690

errno = EINVAL;

691

goto mandos_end;

692

}

693

/* Set the network interface number as scope */

694

to.in6.sin6_scope_id = (uint32_t)if_index;

695

}

696

} else {

697

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

564

698

-Wconversion and

565

699

-Wunreachable-code */

700

}

566

701

567

to.in6.sin6_scope_id = (uint32_t)if_index;

702

if(quit_now){

703

errno = EINTR;

704

goto mandos_end;

705

}

568

706

569

707

if(debug){

570

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

571

port);

572

char addrstr[INET6_ADDRSTRLEN] = "";

573

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

574

sizeof(addrstr)) == NULL){

575

perror("inet_ntop");

708

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

709

char interface[IF_NAMESIZE];

710

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

711

perror_plus("if_indextoname");

712

} else {

713

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

714

ip, interface, port);

715

}

716

} else {

717

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

718

port);

719

}

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

722

const char *pcret;

723

if(af == AF_INET6){

724

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

725

sizeof(addrstr));

726

} else {

727

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

728

sizeof(addrstr));

729

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

576

732

} else {

577

733

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

578

734

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

580

736

}

581

737

}

582

738

583

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

739

if(quit_now){

740

errno = EINTR;

741

goto mandos_end;

742

}

743

744

if(af == AF_INET6){

745

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

746

} else {

747

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

748

}

584

749

if(ret < 0){

585

perror("connect");

586

return -1;

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

755

goto mandos_end;

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

587

761

}

588

762

589

763

const char *out = mandos_protocol_version;

593

767

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

594

768

out_size - written));

595

769

if(ret == -1){

596

perror("write");

597

retval = -1;

770

int e = errno;

771

perror_plus("write");

772

errno = e;

598

773

goto mandos_end;

599

774

}

600

775

written += (size_t)ret;

608

783

break;

609

784

}

610

785

}

786

787

if(quit_now){

788

errno = EINTR;

789

goto mandos_end;

790

}

611

791

}

612

792

613

793

if(debug){

614

794

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

615

795

}

616

796

797

if(quit_now){

798

errno = EINTR;

799

goto mandos_end;

800

}

801

802

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

617

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

618

804

619

do{

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

809

810

do {

620

811

ret = gnutls_handshake(session);

812

if(quit_now){

813

errno = EINTR;

814

goto mandos_end;

815

}

621

816

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

622

817

623

818

if(ret != GNUTLS_E_SUCCESS){

625

820

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

626

821

gnutls_perror(ret);

627

822

}

628

retval = -1;

823

errno = EPROTO;

629

824

goto mandos_end;

630

825

}

631

826

632

827

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

633

828

634

829

if(debug){

635

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

830

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

636

831

ip);

637

832

}

638

833

639

834

while(true){

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

835

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

841

buffer_capacity = incbuffer(&buffer, buffer_length,

641

842

buffer_capacity);

642

843

if(buffer_capacity == 0){

643

perror("adjustbuffer");

644

retval = -1;

844

int e = errno;

845

perror_plus("incbuffer");

846

errno = e;

847

goto mandos_end;

848

}

849

850

if(quit_now){

851

errno = EINTR;

645

852

goto mandos_end;

646

853

}

647

854

656

863

case GNUTLS_E_AGAIN:

657

864

break;

658

865

case GNUTLS_E_REHANDSHAKE:

659

do{

866

do {

660

867

ret = gnutls_handshake(session);

868

869

if(quit_now){

870

errno = EINTR;

871

goto mandos_end;

872

}

661

873

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

662

874

if(ret < 0){

663

875

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

664

876

gnutls_perror(ret);

665

retval = -1;

877

errno = EPROTO;

666

878

goto mandos_end;

667

879

}

668

880

break;

669

881

default:

670

882

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

671

883

" encrypted session with Mandos server\n");

672

retval = -1;

673

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

errno = EIO;

674

886

goto mandos_end;

675

887

}

676

888

} else {

682

894

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

683

895

}

684

896

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

897

if(quit_now){

898

errno = EINTR;

899

goto mandos_end;

900

}

901

902

do {

903

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

if(quit_now){

905

errno = EINTR;

906

goto mandos_end;

907

}

908

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

686

909

687

910

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

911

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

913

buffer_length,

690

914

&decrypted_buffer);

691

915

if(decrypted_buffer_size >= 0){

916

692

917

written = 0;

693

918

while(written < (size_t) decrypted_buffer_size){

919

if(quit_now){

920

errno = EINTR;

921

goto mandos_end;

922

}

923

694

924

ret = (int)fwrite(decrypted_buffer + written, 1,

695

925

(size_t)decrypted_buffer_size - written,

696

926

stdout);

697

927

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

928

int e = errno;

698

929

if(debug){

699

930

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

700

931

strerror(errno));

701

932

}

702

retval = -1;

703

break;

933

errno = e;

934

goto mandos_end;

704

935

}

705

936

written += (size_t)ret;

706

937

}

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

938

retval = 0;

710

939

}

711

} else {

712

retval = -1;

713

940

}

714

941

715

942

/* Shutdown procedure */

716

943

717

944

mandos_end:

718

free(buffer);

719

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

720

if(ret == -1){

721

perror("close");

945

{

946

int e = errno;

947

free(decrypted_buffer);

948

free(buffer);

949

if(tcp_sd >= 0){

950

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

951

}

952

if(ret == -1){

953

if(e == 0){

954

e = errno;

955

}

956

perror_plus("close");

957

}

958

gnutls_deinit(session);

959

errno = e;

960

if(quit_now){

961

errno = EINTR;

962

retval = -1;

963

}

722

964

}

723

gnutls_deinit(session);

724

965

return retval;

725

966

}

726

967

727

968

static void resolve_callback(AvahiSServiceResolver *r,

728

969

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

970

AvahiProtocol proto,

730

971

AvahiResolverEvent event,

731

972

const char *name,

732

973

const char *type,

737

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

980

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

981

AVAHI_GCC_UNUSED void* userdata){

742

982

assert(r);

743

983

744

984

/* Called whenever a service has been resolved successfully or

745

985

timed out */

746

986

987

if(quit_now){

988

return;

989

}

990

747

991

switch(event){

748

992

default:

749

993

case AVAHI_RESOLVER_FAILURE:

750

994

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

751

995

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

752

avahi_strerror(avahi_server_errno(mc->server)));

996

avahi_strerror(avahi_server_errno(mc.server)));

753

997

break;

754

998

755

999

case AVAHI_RESOLVER_FOUND:

761

1005

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

762

1006

ip, (intmax_t)interface, port);

763

1007

}

764

int ret = start_mandos_communication(ip, port, interface, mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

765

1010

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

767

1015

}

768

1016

}

769

1017

}

779

1027

const char *domain,

780

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

1029

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

1030

AVAHI_GCC_UNUSED void* userdata){

784

1031

assert(b);

785

1032

786

1033

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

787

1034

is removed from the LAN */

788

1035

1036

if(quit_now){

1037

return;

1038

}

1039

789

1040

switch(event){

790

1041

default:

791

1042

case AVAHI_BROWSER_FAILURE:

792

1043

793

1044

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

794

avahi_strerror(avahi_server_errno(mc->server)));

795

avahi_simple_poll_quit(mc->simple_poll);

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

796

1047

return;

797

1048

798

1049

case AVAHI_BROWSER_NEW:

801

1052

the callback function is called the Avahi server will free the

802

1053

resolver for us. */

803

1054

804

if(!(avahi_s_service_resolver_new(mc->server, interface,

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

1055

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

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

808

1058

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

809

name, avahi_strerror(avahi_server_errno(mc->server)));

1059

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

810

1060

break;

811

1061

812

1062

case AVAHI_BROWSER_REMOVE:

821

1071

}

822

1072

}

823

1073

1074

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

1075

static void handle_sigterm(int sig){

1076

if(quit_now){

1077

return;

1078

}

1079

quit_now = 1;

1080

signal_received = sig;

1081

int old_errno = errno;

1082

/* set main loop to exit */

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1085

}

1086

errno = old_errno;

1087

}

1088

1089

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

1090

int ret;

1091

1092

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

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

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

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

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

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

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

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

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

1162

return 0;

1163

}

1164

1165

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

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

ssize_t ssret;

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1182

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

1183

if_entry->d_name);

1184

if(ret < 0){

1185

perror_plus("asprintf");

1186

return 0;

1187

}

1188

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

1189

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1192

return 0;

1193

}

1194

free(flagname);

1195

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

1196

/* read line from flags_fd */

1197

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1198

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

1199

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

1200

if(flagstring == NULL){

1201

perror_plus("malloc");

1202

close(flags_fd);

1203

return 0;

1204

}

1205

while(to_read > 0){

1206

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

1207

(size_t)to_read));

1208

if(ssret == -1){

1209

perror_plus("read");

1210

free(flagstring);

1211

close(flags_fd);

1212

return 0;

1213

}

1214

to_read -= ssret;

1215

if(ssret == 0){

1216

break;

1217

}

1218

}

1219

close(flags_fd);

1220

intmax_t tmpmax;

1221

char *tmp;

1222

errno = 0;

1223

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

1224

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

1225

and not (isspace(*tmp)))

1226

or tmpmax != (ifreq_flags)tmpmax){

1227

if(debug){

1228

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

1229

flagstring, if_entry->d_name);

1230

}

1231

free(flagstring);

1232

return 0;

1233

}

1234

free(flagstring);

1235

ifreq_flags flags = (ifreq_flags)tmpmax;

1236

/* Reject the loopback device */

1237

if(flags & IFF_LOOPBACK){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

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

1251

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

1252

if(debug){

1253

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

1254

if_entry->d_name);

1255

}

1256

return 1;

1257

}

1258

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

1259

if(not (flags & IFF_BROADCAST)){

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 0;

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

/* Accept this device */

1275

if(debug){

1276

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

1277

if_entry->d_name);

1278

}

1279

return 1;

1280

}

1281

1282

int notdotentries(const struct dirent *direntry){

1283

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

1284

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

1285

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

1286

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

1287

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

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

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

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

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

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

char *end = strchr(direntry->d_name, '\0')-1;

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

and (*end == '#')){

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

ret = stat(direntry->d_name, &st);

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

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

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

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

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

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

1362

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

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

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

1368

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

1369

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

1370

block_time = ((retry_interval

1371

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

1372

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

1373

1374

if (debug){

1375

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

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

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

1395

servers, but don't block */

1396

}

1397

1398

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

1399

}

1400

if(ret != 0){

1401

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

1402

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

1403

}

1404

}

1405

}

1406

}

1407

824

1408

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

825

1409

AvahiSServiceBrowser *sb = NULL;

826

1410

int error;

827

1411

int ret;

828

1412

intmax_t tmpmax;

829

int numchars;

1413

char *tmp;

830

1414

int exitcode = EXIT_SUCCESS;

831

const char *interface = "eth0";

1415

const char *interface = "";

832

1416

struct ifreq network;

833

int sd;

1417

int sd = -1;

1418

bool take_down_interface = false;

834

1419

uid_t uid;

835

1420

gid_t gid;

836

char *connect_to = NULL;

837

1421

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

838

1422

bool tempdir_created = false;

839

1423

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

840

1424

const char *seckey = PATHDIR "/" SECKEY;

841

1425

const char *pubkey = PATHDIR "/" PUBKEY;

842

1426

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

846

1427

bool gnutls_initialized = false;

847

1428

bool gpgme_initialized = false;

848

double delay = 2.5;

1429

float delay = 2.5f;

1430

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

1431

retrying the same server again */

1432

1433

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1434

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1435

1436

uid = getuid();

1437

gid = getgid();

1438

1439

/* Lower any group privileges we might have, just to be safe */

1440

errno = 0;

1441

ret = setgid(gid);

1442

if(ret == -1){

1443

perror_plus("setgid");

1444

}

1445

1446

/* Lower user privileges (temporarily) */

1447

errno = 0;

1448

ret = seteuid(uid);

1449

if(ret == -1){

1450

perror_plus("seteuid");

1451

}

1452

1453

if(quit_now){

1454

goto end;

1455

}

849

1456

850

1457

{

851

1458

struct argp_option options[] = {

857

1464

.group = 1 },

858

1465

{ .name = "interface", .key = 'i',

859

1466

.arg = "NAME",

860

.doc = "Interface that will be used to search for Mandos"

861

" servers",

1467

.doc = "Network interface that will be used to search for"

1468

" Mandos servers",

862

1469

.group = 1 },

863

1470

{ .name = "seckey", .key = 's',

864

1471

.arg = "FILE",

881

1488

.arg = "SECONDS",

882

1489

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

883

1490

.group = 2 },

1491

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

1492

.arg = "SECONDS",

1493

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

1494

.group = 2 },

1495

/*

1496

* These reproduce what we would get without ARGP_NO_HELP

1497

*/

1498

{ .name = "help", .key = '?',

1499

.doc = "Give this help list", .group = -1 },

1500

{ .name = "usage", .key = -3,

1501

.doc = "Give a short usage message", .group = -1 },

1502

{ .name = "version", .key = 'V',

1503

.doc = "Print program version", .group = -1 },

884

1504

{ .name = NULL }

885

1505

};

886

1506

887

1507

error_t parse_opt(int key, char *arg,

888

1508

struct argp_state *state){

1509

errno = 0;

889

1510

switch(key){

890

1511

case 128: /* --debug */

891

1512

debug = true;

903

1524

pubkey = arg;

904

1525

break;

905

1526

case 129: /* --dh-bits */

906

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

907

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

908

or arg[numchars] != '\0'){

909

fprintf(stderr, "Bad number of DH bits\n");

910

exit(EXIT_FAILURE);

1527

errno = 0;

1528

tmpmax = strtoimax(arg, &tmp, 10);

1529

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

1530

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1531

argp_error(state, "Bad number of DH bits");

911

1532

}

912

1533

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

913

1534

break;

915

1536

mc.priority = arg;

916

1537

break;

917

1538

case 131: /* --delay */

918

ret = sscanf(arg, "%lf%n", &delay, &numchars);

919

if(ret < 1 or arg[numchars] != '\0'){

920

fprintf(stderr, "Bad delay\n");

921

exit(EXIT_FAILURE);

1539

errno = 0;

1540

delay = strtof(arg, &tmp);

1541

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

1542

argp_error(state, "Bad delay");

1543

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

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

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

922

1551

}

923

1552

break;

924

case ARGP_KEY_ARG:

925

argp_usage(state);

926

case ARGP_KEY_END:

1553

/*

1554

* These reproduce what we would get without ARGP_NO_HELP

1555

*/

1556

case '?': /* --help */

1557

argp_state_help(state, state->out_stream,

1558

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1559

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1560

case -3: /* --usage */

1561

argp_state_help(state, state->out_stream,

1562

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1563

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

1564

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

1565

exit(argp_err_exit_status);

927

1566

break;

928

1567

default:

929

1568

return ARGP_ERR_UNKNOWN;

930

1569

}

931

return 0;

1570

return errno;

932

1571

}

933

1572

934

1573

struct argp argp = { .options = options, .parser = parse_opt,

935

1574

.args_doc = "",

936

1575

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

937

1576

" passwords from a Mandos server" };

938

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

939

if(ret == ARGP_ERR_UNKNOWN){

940

fprintf(stderr, "Unknown error while parsing arguments\n");

1577

ret = argp_parse(&argp, argc, argv,

1578

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1579

switch(ret){

1580

case 0:

1581

break;

1582

case ENOMEM:

1583

default:

1584

errno = ret;

1585

perror_plus("argp_parse");

1586

exitcode = EX_OSERR;

1587

goto end;

1588

case EINVAL:

1589

exitcode = EX_USAGE;

1590

goto end;

1591

}

1592

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

setenv("VERBOSE", debug ? "1" : "0", 1);

1678

setenv("MODE", "start", 1);

1679

/* setenv( XXX more here */

1680

ret = execl(fullname, direntry->d_name, "start");

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1689

}

1690

1691

if(not debug){

1692

avahi_set_log_function(empty_log);

1693

}

1694

1695

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

1696

struct dirent **direntries;

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1698

alphasort);

1699

if(ret >= 1){

1700

/* Pick the first good interface */

1701

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

1702

if(debug){

1703

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

1704

}

1705

if(interface == NULL){

1706

perror_plus("malloc");

1707

free(direntries);

1708

exitcode = EXIT_FAILURE;

1709

goto end;

1710

}

1711

free(direntries);

1712

} else {

1713

free(direntries);

1714

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

941

1715

exitcode = EXIT_FAILURE;

942

1716

goto end;

943

1717

}

944

1718

}

945

1719

1720

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

1721

from the signal handler */

1722

/* Initialize the pseudo-RNG for Avahi */

1723

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

1724

mc.simple_poll = avahi_simple_poll_new();

1725

if(mc.simple_poll == NULL){

1726

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

1727

exitcode = EX_UNAVAILABLE;

1728

goto end;

1729

}

1730

1731

sigemptyset(&sigterm_action.sa_mask);

1732

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

1733

if(ret == -1){

1734

perror_plus("sigaddset");

1735

exitcode = EX_OSERR;

1736

goto end;

1737

}

1738

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

1739

if(ret == -1){

1740

perror_plus("sigaddset");

1741

exitcode = EX_OSERR;

1742

goto end;

1743

}

1744

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

1745

if(ret == -1){

1746

perror_plus("sigaddset");

1747

exitcode = EX_OSERR;

1748

goto end;

1749

}

1750

/* Need to check if the handler is SIG_IGN before handling:

1751

| [[info:libc:Initial Signal Actions]] |

1752

| [[info:libc:Basic Signal Handling]] |

1753

*/

1754

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

1755

if(ret == -1){

1756

perror_plus("sigaction");

1757

return EX_OSERR;

1758

}

1759

if(old_sigterm_action.sa_handler != SIG_IGN){

1760

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

1761

if(ret == -1){

1762

perror_plus("sigaction");

1763

exitcode = EX_OSERR;

1764

goto end;

1765

}

1766

}

1767

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

1768

if(ret == -1){

1769

perror_plus("sigaction");

1770

return EX_OSERR;

1771

}

1772

if(old_sigterm_action.sa_handler != SIG_IGN){

1773

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

1774

if(ret == -1){

1775

perror_plus("sigaction");

1776

exitcode = EX_OSERR;

1777

goto end;

1778

}

1779

}

1780

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

1781

if(ret == -1){

1782

perror_plus("sigaction");

1783

return EX_OSERR;

1784

}

1785

if(old_sigterm_action.sa_handler != SIG_IGN){

1786

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

1787

if(ret == -1){

1788

perror_plus("sigaction");

1789

exitcode = EX_OSERR;

1790

goto end;

1791

}

1792

}

1793

946

1794

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

947

{

1795

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

1796

if_index = (AvahiIfIndex) if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

exitcode = EX_UNAVAILABLE;

1800

goto end;

1801

}

1802

1803

if(quit_now){

1804

goto end;

1805

}

1806

1807

/* Re-raise priviliges */

1808

errno = 0;

1809

ret = seteuid(0);

1810

if(ret == -1){

1811

perror_plus("seteuid");

1812

}

1813

948

1814

#ifdef __linux__

949

1815

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

messages to mess up the prompt */

1816

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

951

1817

ret = klogctl(8, NULL, 5);

1818

bool restore_loglevel = true;

952

1819

if(ret == -1){

953

perror("klogctl");

1820

restore_loglevel = false;

1821

perror_plus("klogctl");

954

1822

}

955

#endif

1823

#endif /* __linux__ */

956

1824

957

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1826

if(sd < 0){

959

perror("socket");

960

exitcode = EXIT_FAILURE;

1827

perror_plus("socket");

1828

exitcode = EX_OSERR;

961

1829

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

1830

if(restore_loglevel){

1831

ret = klogctl(7, NULL, 0);

1832

if(ret == -1){

1833

perror_plus("klogctl");

1834

}

1835

}

1836

#endif /* __linux__ */

1837

/* Lower privileges */

1838

errno = 0;

1839

ret = seteuid(uid);

963

1840

if(ret == -1){

964

perror("klogctl");

1841

perror_plus("seteuid");

965

1842

}

966

#endif

967

1843

goto end;

968

1844

}

969

1845

strcpy(network.ifr_name, interface);

970

1846

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

971

1847

if(ret == -1){

972

perror("ioctl SIOCGIFFLAGS");

1848

perror_plus("ioctl SIOCGIFFLAGS");

973

1849

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

1850

if(restore_loglevel){

1851

ret = klogctl(7, NULL, 0);

1852

if(ret == -1){

1853

perror_plus("klogctl");

1854

}

1855

}

1856

#endif /* __linux__ */

1857

exitcode = EX_OSERR;

1858

/* Lower privileges */

1859

errno = 0;

1860

ret = seteuid(uid);

975

1861

if(ret == -1){

976

perror("klogctl");

1862

perror_plus("seteuid");

977

1863

}

978

#endif

979

exitcode = EXIT_FAILURE;

980

1864

goto end;

981

1865

}

982

1866

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

983

1867

network.ifr_flags |= IFF_UP;

1868

take_down_interface = true;

984

1869

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

985

1870

if(ret == -1){

986

perror("ioctl SIOCSIFFLAGS");

987

exitcode = EXIT_FAILURE;

1871

take_down_interface = false;

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1873

exitcode = EX_OSERR;

988

1874

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

1875

if(restore_loglevel){

1876

ret = klogctl(7, NULL, 0);

1877

if(ret == -1){

1878

perror_plus("klogctl");

1879

}

1880

}

1881

#endif /* __linux__ */

1882

/* Lower privileges */

1883

errno = 0;

1884

ret = seteuid(uid);

990

1885

if(ret == -1){

991

perror("klogctl");

1886

perror_plus("seteuid");

992

1887

}

993

#endif

994

1888

goto end;

995

1889

}

996

1890

}

997

/* sleep checking until interface is running */

1891

/* Sleep checking until interface is running.

1892

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

998

1893

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

999

1894

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

1000

1895

if(ret == -1){

1001

perror("ioctl SIOCGIFFLAGS");

1896

perror_plus("ioctl SIOCGIFFLAGS");

1002

1897

} else if(network.ifr_flags & IFF_RUNNING){

1003

1898

break;

1004

1899

}

1005

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1006

1901

ret = nanosleep(&sleeptime, NULL);

1007

1902

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

1008

perror("nanosleep");

1903

perror_plus("nanosleep");

1009

1904

}

1010

1905

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1906

if(not take_down_interface){

1907

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

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1014

1912

}

1015

1913

#ifdef __linux__

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1020

}

1021

#endif

1022

}

1023

1024

uid = getuid();

1025

gid = getgid();

1026

1027

setgid(gid);

1028

if(ret == -1){

1029

perror("setgid");

1030

}

1031

1032

ret = setuid(uid);

1033

if(ret == -1){

1034

perror("setuid");

1035

}

1036

1037

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

1914

if(restore_loglevel){

1915

/* Restores kernel loglevel to default */

1916

ret = klogctl(7, NULL, 0);

1917

if(ret == -1){

1918

perror_plus("klogctl");

1919

}

1920

}

1921

#endif /* __linux__ */

1922

/* Lower privileges */

1923

errno = 0;

1924

if(take_down_interface){

1925

/* Lower privileges */

1926

ret = seteuid(uid);

1927

if(ret == -1){

1928

perror_plus("seteuid");

1929

}

1930

} else {

1931

/* Lower privileges permanently */

1932

ret = setuid(uid);

1933

if(ret == -1){

1934

perror_plus("setuid");

1935

}

1936

}

1937

}

1938

1939

if(quit_now){

1940

goto end;

1941

}

1942

1943

ret = init_gnutls_global(pubkey, seckey);

1038

1944

if(ret == -1){

1039

1945

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

1040

exitcode = EXIT_FAILURE;

1946

exitcode = EX_UNAVAILABLE;

1041

1947

goto end;

1042

1948

} else {

1043

1949

gnutls_initialized = true;

1044

1950

}

1045

1951

1952

if(quit_now){

1953

goto end;

1954

}

1955

1046

1956

if(mkdtemp(tempdir) == NULL){

1047

perror("mkdtemp");

1957

perror_plus("mkdtemp");

1048

1958

goto end;

1049

1959

}

1050

1960

tempdir_created = true;

1051

1961

1052

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

1962

if(quit_now){

1963

goto end;

1964

}

1965

1966

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

1053

1967

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

1054

exitcode = EXIT_FAILURE;

1968

exitcode = EX_UNAVAILABLE;

1055

1969

goto end;

1056

1970

} else {

1057

1971

gpgme_initialized = true;

1058

1972

}

1059

1973

1060

if_index = (AvahiIfIndex) if_nametoindex(interface);

1061

if(if_index == 0){

1062

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

1063

exitcode = EXIT_FAILURE;

1974

if(quit_now){

1064

1975

goto end;

1065

1976

}

1066

1977

1070

1981

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

1071

1982

if(address == NULL){

1072

1983

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

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1075

}

1984

exitcode = EX_USAGE;

1985

goto end;

1986

}

1987

1988

if(quit_now){

1989

goto end;

1990

}

1991

1076

1992

uint16_t port;

1077

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1078

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1079

or address[numchars+1] != '\0'){

1993

errno = 0;

1994

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

1995

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

1996

or tmpmax != (uint16_t)tmpmax){

1080

1997

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

1081

exitcode = EXIT_FAILURE;

1082

goto end;

1083

}

1998

exitcode = EX_USAGE;

1999

goto end;

2000

}

2001

2002

if(quit_now){

2003

goto end;

2004

}

2005

1084

2006

port = (uint16_t)tmpmax;

1085

2007

*address = '\0';

2008

/* Colon in address indicates IPv6 */

2009

int af;

2010

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

2011

af = AF_INET6;

2012

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

2013

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

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

2018

} else {

2019

af = AF_INET;

2020

}

1086

2021

address = connect_to;

1087

ret = start_mandos_communication(address, port, if_index, &mc);

1088

if(ret < 0){

1089

exitcode = EXIT_FAILURE;

1090

} else {

2022

2023

if(quit_now){

2024

goto end;

2025

}

2026

2027

while(not quit_now){

2028

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

2029

if(quit_now or ret == 0){

2030

break;

2031

}

2032

if(debug){

2033

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

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

2039

if (not quit_now){

1091

2040

exitcode = EXIT_SUCCESS;

1092

2041

}

2042

1093

2043

goto end;

1094

2044

}

1095

2045

1096

if(not debug){

1097

avahi_set_log_function(empty_log);

1098

}

1099

1100

/* Initialize the pseudo-RNG for Avahi */

1101

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

1102

1103

/* Allocate main Avahi loop object */

1104

mc.simple_poll = avahi_simple_poll_new();

1105

if(mc.simple_poll == NULL){

1106

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

1107

exitcode = EXIT_FAILURE;

2046

if(quit_now){

1108

2047

goto end;

1109

2048

}

1110

2049

1130

2069

if(mc.server == NULL){

1131

2070

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

1132

2071

avahi_strerror(error));

1133

exitcode = EXIT_FAILURE;

2072

exitcode = EX_UNAVAILABLE;

2073

goto end;

2074

}

2075

2076

if(quit_now){

1134

2077

goto end;

1135

2078

}

1136

2079

1137

2080

/* Create the Avahi service browser */

1138

2081

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

2082

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2083

NULL, 0, browse_callback, NULL);

1141

2084

if(sb == NULL){

1142

2085

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

1143

2086

avahi_strerror(avahi_server_errno(mc.server)));

1144

exitcode = EXIT_FAILURE;

2087

exitcode = EX_UNAVAILABLE;

2088

goto end;

2089

}

2090

2091

if(quit_now){

1145

2092

goto end;

1146

2093

}

1147

2094

1150

2097

if(debug){

1151

2098

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

1152

2099

}

1153

1154

avahi_simple_poll_loop(mc.simple_poll);

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

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

2105

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

2106

}

1155

2107

1156

2108

end:

1157

2109

1178

2130

if(gpgme_initialized){

1179

2131

gpgme_release(mc.ctx);

1180

2132

}

1181

1182

/* Removes the temp directory used by GPGME */

2133

2134

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

2135

has seen */

2136

if(mc.current_server != NULL){

2137

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

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

/* XXX run network hooks "stop" here */

2146

2147

/* Take down the network interface */

2148

if(take_down_interface){

2149

/* Re-raise priviliges */

2150

errno = 0;

2151

ret = seteuid(0);

2152

if(ret == -1){

2153

perror_plus("seteuid");

2154

}

2155

if(geteuid() == 0){

2156

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

2157

if(ret == -1){

2158

perror_plus("ioctl SIOCGIFFLAGS");

2159

} else if(network.ifr_flags & IFF_UP) {

2160

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

2161

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

2162

if(ret == -1){

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2164

}

2165

}

2166

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

2167

if(ret == -1){

2168

perror_plus("close");

2169

}

2170

/* Lower privileges permanently */

2171

errno = 0;

2172

ret = setuid(uid);

2173

if(ret == -1){

2174

perror_plus("setuid");

2175

}

2176

}

2177

}

2178

2179

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

1183

2180

if(tempdir_created){

1184

DIR *d;

1185

struct dirent *direntry;

1186

d = opendir(tempdir);

1187

if(d == NULL){

1188

if(errno != ENOENT){

1189

perror("opendir");

1190

}

1191

} else {

1192

while(true){

1193

direntry = readdir(d);

1194

if(direntry == NULL){

1195

break;

1196

}

1197

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

1198

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

1199

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

1200

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

1201

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

1202

continue;

1203

}

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

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

2184

alphasort);

2185

if (numentries > 0){

2186

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

2187

direntry = direntries[i];

1204

2188

char *fullname = NULL;

1205

2189

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

1206

2190

direntry->d_name);

1207

2191

if(ret < 0){

1208

perror("asprintf");

2192

perror_plus("asprintf");

1209

2193

continue;

1210

2194

}

1211

2195

ret = remove(fullname);

1215

2199

}

1216

2200

free(fullname);

1217

2201

}

1218

closedir(d);

2202

}

2203

2204

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

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1219

2208

}

1220

2209

ret = rmdir(tempdir);

1221

2210

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

1222

perror("rmdir");

1223

}

2211

perror_plus("rmdir");

2212

}

2213

}

2214

2215

if(quit_now){

2216

sigemptyset(&old_sigterm_action.sa_mask);

2217

old_sigterm_action.sa_handler = SIG_DFL;

2218

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2219

&old_sigterm_action,

2220

NULL));

2221

if(ret == -1){

2222

perror_plus("sigaction");

2223

}

2224

do {

2225

ret = raise(signal_received);

2226

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

2227

if(ret != 0){

2228

perror_plus("raise");

2229

abort();

2230

}

2231

TEMP_FAILURE_RETRY(pause());

1224

2232

}

1225

2233

1226

2234

return exitcode;