/mandos/release : revision 183

32

#define _LARGEFILE_SOURCE

33

#define _FILE_OFFSET_BITS 64

34

35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

35

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

36

37

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

37

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

38

stdout, ferror() */

38

39

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

39

40

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

40

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

41

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

42

srand() */

41

43

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

42

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

43

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

44

SIOCSIFFLAGS */

44

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

45

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

46

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

45

47

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

46

sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */

48

sockaddr_in6, PF_INET6,

49

SOCK_STREAM, INET6_ADDRSTRLEN,

50

uid_t, gid_t, open(), opendir(), DIR */

51

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

47

52

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

48

53

struct in6_addr, inet_pton(),

49

54

connect() */

50

#include <assert.h>

51

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

52

#include <time.h>

55

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

56

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

57

#include <inttypes.h> /* PRIu16 */

58

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

59

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

60

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

53

61

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

54

62

SIOCSIFFLAGS, if_indextoname(),

55

63

if_nametoindex(), IF_NAMESIZE */

56

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

57

64

#include <netinet/in.h>

65

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

66

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

67

setgid() */

58

68

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

59

#include <iso646.h> /* not */

60

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

61

struct argp_state, struct argp,

62

argp_parse() */

69

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

70

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

71

argp_state, struct argp,

72

argp_parse(), ARGP_KEY_ARG,

73

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

63

74

64

75

/* Avahi */

65

#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,

66

AvahiIfIndex */

76

/* All Avahi types, constants and functions

77

Avahi*, avahi_*,

78

AVAHI_* */

79

#include <avahi-core/core.h>

67

80

#include <avahi-core/lookup.h>

68

#include <avahi-core/log.h> /* AvahiLogLevel */

81

#include <avahi-core/log.h>

69

82

#include <avahi-common/simple-watch.h>

70

83

#include <avahi-common/malloc.h>

71

84

#include <avahi-common/error.h>

72

85

73

86

/* GnuTLS */

74

#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,

75

gnutls_dh_params_t,

76

gnutls_strerror(),

77

gnutls_global_init(),

78

gnutls_global_set_log_level(),

79

gnutls_global_set_log_function(),

80

gnutls_certificate_allocate_credentials(),

81

gnutls_global_deinit(),

82

gnutls_dh_params_init(),

83

gnutls_dh_params_generate(),

84

gnutls_certificate_set_dh_params(),

85

gnutls_certificate_free_credentials(),

86

gnutls_session_t, gnutls_init(),

87

gnutls_priority_set_direct(),

88

gnutls_deinit(),

89

gnutls_credentials_set(),

90

gnutls_certificate_server_set_request(),

91

gnutls_dh_set_prime_bits(),

92

gnutls_transport_set_ptr(),

93

gnutls_transport_ptr_t,

94

gnutls_handshake(),

95

gnutls_record_recv()

96

gnutls_perror(), gnutls_bye(),

87

#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

88

functions:

89

gnutls_*

97

90

init_gnutls_session(),

98

GNUTLS_E_SUCCESS,

99

GNUTLS_CRD_CERTIFICATE,

100

GNUTLS_CERT_IGNORE,

101

GNUTLS_E_INTERRUPTED,

102

GNUTLS_E_AGAIN,

103

GNUTLS_E_REHANDSHAKE,

104

GNUTLS_SHUT_RDWR, */

105

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

106

GNUTLS_OPENPGP_FMT_BASE64 */

91

GNUTLS_* */

92

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

93

GNUTLS_OPENPGP_FMT_BASE64 */

107

94

108

95

/* GPGME */

109

#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,

110

gpgme_error_t, gpgme_engine_info_t,

111

gpgme_check_version(),

112

gpgme_engine_check_version(),

113

gpgme_strsource(),

114

gpgme_strerror(),

115

gpgme_get_engine_info(),

116

gpgme_set_engine_info(),

117

gpgme_data_new_from_mem(),

118

gpgme_data_new(), gpgme_new(),

119

gpgme_op_decrypt(),

120

gpgme_decrypt_result_t,

121

gpgme_op_decrypt_result(),

122

gpgme_recipient_t,

123

gpgme_pubkey_algo_name(),

124

gpgme_data_seek(),

125

gpgme_data_read(),

126

gpgme_data_release()

96

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

97

functions:

98

gpgme_*

127

99

GPGME_PROTOCOL_OpenPGP,

128

GPG_ERR_NO_ERROR,

129

GPG_ERR_NO_SECKEY, */

100

GPG_ERR_NO_* */

130

101

131

102

#define BUFFER_SIZE 256

132

103

104

/*

105

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

106

*/

107

108

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

109

#define SECKEY "seckey.txt"

110

#define PUBKEY "pubkey.txt"

111

133

112

bool debug = false;

134

static const char *keydir = "/conf/conf.d/mandos";

135

113

static const char mandos_protocol_version[] = "1";

136

const char *argp_program_version = "mandosclient 0.9";

114

const char *argp_program_version = "mandos-client 1.0";

137

115

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

138

116

139

117

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

144

122

unsigned int dh_bits;

145

123

gnutls_dh_params_t dh_params;

146

124

const char *priority;

125

gpgme_ctx_t ctx;

147

126

} mandos_context;

148

127

149

128

/*

164

143

}

165

144

166

145

/*

167

* Decrypt OpenPGP data using keyrings in HOMEDIR.

168

* Returns -1 on error

146

* Initialize GPGME.

169

147

*/

170

static ssize_t pgp_packet_decrypt (const char *cryptotext,

171

size_t crypto_size,

172

char **plaintext,

173

const char *homedir){

174

gpgme_data_t dh_crypto, dh_plain;

175

gpgme_ctx_t ctx;

148

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

149

const char *pubkey, const char *tempdir){

150

int ret;

176

151

gpgme_error_t rc;

177

ssize_t ret;

178

size_t plaintext_capacity = 0;

179

ssize_t plaintext_length = 0;

180

152

gpgme_engine_info_t engine_info;

181

153

154

155

/*

156

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

157

*/

158

bool import_key(const char *filename){

159

int fd;

160

gpgme_data_t pgp_data;

161

162

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

163

if(fd == -1){

164

perror("open");

165

return false;

166

}

167

168

rc = gpgme_data_new_from_fd(&pgp_data, fd);

169

if (rc != GPG_ERR_NO_ERROR){

170

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

171

gpgme_strsource(rc), gpgme_strerror(rc));

172

return false;

173

}

174

175

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

176

if (rc != GPG_ERR_NO_ERROR){

177

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

178

gpgme_strsource(rc), gpgme_strerror(rc));

179

return false;

180

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

183

if(ret == -1){

184

perror("close");

185

}

186

gpgme_data_release(pgp_data);

187

return true;

188

}

189

182

190

if (debug){

183

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

191

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

184

192

}

185

193

186

194

/* Init GPGME */

189

197

if (rc != GPG_ERR_NO_ERROR){

190

198

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

191

199

gpgme_strsource(rc), gpgme_strerror(rc));

192

return -1;

200

return false;

193

201

}

194

202

195

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

203

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

196

204

rc = gpgme_get_engine_info (&engine_info);

197

205

if (rc != GPG_ERR_NO_ERROR){

198

206

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

199

207

gpgme_strsource(rc), gpgme_strerror(rc));

200

return -1;

208

return false;

201

209

}

202

210

while(engine_info != NULL){

203

211

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

204

212

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

205

engine_info->file_name, homedir);

213

engine_info->file_name, tempdir);

206

214

break;

207

215

}

208

216

engine_info = engine_info->next;

209

217

}

210

218

if(engine_info == NULL){

211

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

212

return -1;

219

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

220

return false;

221

}

222

223

/* Create new GPGME "context" */

224

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

225

if (rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

228

return false;

229

}

230

231

if (not import_key(pubkey) or not import_key(seckey)){

232

return false;

233

}

234

235

return true;

236

}

237

238

/*

239

* Decrypt OpenPGP data.

240

* Returns -1 on error

241

*/

242

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

246

gpgme_data_t dh_crypto, dh_plain;

247

gpgme_error_t rc;

248

ssize_t ret;

249

size_t plaintext_capacity = 0;

250

ssize_t plaintext_length = 0;

251

252

if (debug){

253

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

213

254

}

214

255

215

256

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

230

271

return -1;

231

272

}

232

273

233

/* Create new GPGME "context" */

234

rc = gpgme_new(&ctx);

235

if (rc != GPG_ERR_NO_ERROR){

236

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

237

gpgme_strsource(rc), gpgme_strerror(rc));

238

plaintext_length = -1;

239

goto decrypt_end;

240

}

241

242

274

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

243

275

data buffer */

244

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

276

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

245

277

if (rc != GPG_ERR_NO_ERROR){

246

278

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

247

279

gpgme_strsource(rc), gpgme_strerror(rc));

248

280

plaintext_length = -1;

281

if (debug){

282

gpgme_decrypt_result_t result;

283

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

285

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

286

} else {

287

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

288

result->unsupported_algorithm);

289

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

290

result->wrong_key_usage);

291

if(result->file_name != NULL){

292

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

293

}

294

gpgme_recipient_t recipient;

295

recipient = result->recipients;

296

if(recipient){

297

while(recipient != NULL){

298

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

299

gpgme_pubkey_algo_name(recipient->pubkey_algo));

300

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

301

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

302

recipient->status == GPG_ERR_NO_SECKEY

303

? "No" : "Yes");

304

recipient = recipient->next;

305

}

306

}

307

}

308

}

249

309

goto decrypt_end;

250

310

}

251

311

253

313

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

254

314

}

255

315

256

if (debug){

257

gpgme_decrypt_result_t result;

258

result = gpgme_op_decrypt_result(ctx);

259

if (result == NULL){

260

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

261

} else {

262

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

263

result->unsupported_algorithm);

264

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

265

result->wrong_key_usage);

266

if(result->file_name != NULL){

267

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

268

}

269

gpgme_recipient_t recipient;

270

recipient = result->recipients;

271

if(recipient){

272

while(recipient != NULL){

273

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

274

gpgme_pubkey_algo_name(recipient->pubkey_algo));

275

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

276

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

277

recipient->status == GPG_ERR_NO_SECKEY

278

? "No" : "Yes");

279

recipient = recipient->next;

280

}

281

}

282

}

283

}

284

285

316

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

286

317

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

287

perror("pgpme_data_seek");

318

perror("gpgme_data_seek");

288

319

plaintext_length = -1;

289

320

goto decrypt_end;

290

321

}

314

345

}

315

346

plaintext_length += ret;

316

347

}

317

348

318

349

if(debug){

319

350

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

320

351

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

334

365

}

335

366

336

367

static const char * safer_gnutls_strerror (int value) {

337

const char *ret = gnutls_strerror (value);

368

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

338

369

if (ret == NULL)

339

370

ret = "(unknown)";

340

371

return ret;

347

378

}

348

379

349

380

static int init_gnutls_global(mandos_context *mc,

350

const char *pubkeyfile,

351

const char *seckeyfile){

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

352

383

int ret;

353

384

354

385

if(debug){

355

386

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

356

387

}

357

358

if ((ret = gnutls_global_init ())

359

!= GNUTLS_E_SUCCESS) {

388

389

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

360

391

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

361

392

safer_gnutls_strerror(ret));

362

393

return -1;

371

402

}

372

403

373

404

/* OpenPGP credentials */

374

if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

375

!= GNUTLS_E_SUCCESS) {

376

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

405

gnutls_certificate_allocate_credentials(&mc->cred);

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

377

409

safer_gnutls_strerror(ret));

378

410

gnutls_global_deinit ();

379

411

return -1;

380

412

}

381

413

382

414

if(debug){

383

fprintf(stderr, "Attempting to use OpenPGP certificate %s"

384

" and keyfile %s as GnuTLS credentials\n", pubkeyfile,

385

seckeyfile);

415

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

416

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

417

seckeyfilename);

386

418

}

387

419

388

420

ret = gnutls_certificate_set_openpgp_key_file

389

(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

390

423

if (ret != GNUTLS_E_SUCCESS) {

391

424

fprintf(stderr,

392

425

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

393

" '%s')\n", ret, pubkeyfile, seckeyfile);

394

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

426

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

427

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

395

428

safer_gnutls_strerror(ret));

396

429

goto globalfail;

397

430

}

411

444

}

412

445

413

446

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

414

447

415

448

return 0;

416

449

417

450

globalfail:

418

451

419

452

gnutls_certificate_free_credentials(mc->cred);

420

453

gnutls_global_deinit();

454

gnutls_dh_params_deinit(mc->dh_params);

421

455

return -1;

422

423

456

}

424

457

425

458

static int init_gnutls_session(mandos_context *mc,

488

521

}

489

522

490

523

if(debug){

491

fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

492

ip, port);

524

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

525

"\n", ip, port);

493

526

}

494

527

495

528

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

497

530

perror("socket");

498

531

return -1;

499

532

}

500

533

501

534

if(debug){

502

535

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

503

536

perror("if_indextoname");

506

539

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

507

540

}

508

541

509

memset(&to,0,sizeof(to)); /* Spurious warning */

542

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

510

543

to.in6.sin6_family = AF_INET6;

511

544

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

512

545

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

519

552

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

520

553

return -1;

521

554

}

522

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

555

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

523

556

524

557

to.in6.sin6_scope_id = (uint32_t)if_index;

525

558

526

559

if(debug){

527

fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

560

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

561

port);

528

562

char addrstr[INET6_ADDRSTRLEN] = "";

529

563

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

530

564

sizeof(addrstr)) == NULL){

541

575

perror("connect");

542

576

return -1;

543

577

}

544

578

545

579

const char *out = mandos_protocol_version;

546

580

written = 0;

547

581

while (true){

565

599

}

566

600

}

567

601

}

568

602

569

603

if(debug){

570

604

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

571

605

}

572

606

573

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

574

608

575

ret = gnutls_handshake (session);

609

do{

610

ret = gnutls_handshake (session);

611

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

576

612

577

613

if (ret != GNUTLS_E_SUCCESS){

578

614

if(debug){

589

625

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

590

626

ip);

591

627

}

592

628

593

629

while(true){

594

630

buffer_capacity = adjustbuffer(&buffer, buffer_length,

595

631

buffer_capacity);

610

646

case GNUTLS_E_AGAIN:

611

647

break;

612

648

case GNUTLS_E_REHANDSHAKE:

613

ret = gnutls_handshake (session);

649

do{

650

ret = gnutls_handshake (session);

651

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

614

652

if (ret < 0){

615

653

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

616

654

gnutls_perror (ret);

637

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

638

676

639

677

if (buffer_length > 0){

640

decrypted_buffer_size = pgp_packet_decrypt(buffer,

678

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

641

679

buffer_length,

642

&decrypted_buffer,

643

keydir);

680

&decrypted_buffer);

644

681

if (decrypted_buffer_size >= 0){

645

682

written = 0;

646

683

while(written < (size_t) decrypted_buffer_size){

661

698

} else {

662

699

retval = -1;

663

700

}

701

} else {

702

retval = -1;

664

703

}

665

704

666

705

/* Shutdown procedure */

667

706

668

707

mandos_end:

669

708

free(buffer);

670

close(tcp_sd);

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

710

if(ret == -1){

711

perror("close");

712

}

671

713

gnutls_deinit (session);

672

714

return retval;

673

715

}

687

729

flags,

688

730

void* userdata) {

689

731

mandos_context *mc = userdata;

690

assert(r); /* Spurious warning */

732

assert(r);

691

733

692

734

/* Called whenever a service has been resolved successfully or

693

735

timed out */

705

747

char ip[AVAHI_ADDRESS_STR_MAX];

706

748

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

707

749

if(debug){

708

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

709

" port %d\n", name, host_name, ip, interface, port);

750

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

751

PRIu16 ") on port %d\n", name, host_name, ip,

752

interface, port);

710

753

}

711

754

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

712

755

if (ret == 0){

713

exit(EXIT_SUCCESS);

756

avahi_simple_poll_quit(mc->simple_poll);

714

757

}

715

758

}

716

759

}

728

771

flags,

729

772

void* userdata) {

730

773

mandos_context *mc = userdata;

731

assert(b); /* Spurious warning */

774

assert(b);

732

775

733

776

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

734

777

is removed from the LAN */

768

811

}

769

812

}

770

813

771

/* Combines file name and path and returns the malloced new

772

string. some sane checks could/should be added */

773

static const char *combinepath(const char *first, const char *second){

774

size_t f_len = strlen(first);

775

size_t s_len = strlen(second);

776

char *tmp = malloc(f_len + s_len + 2);

777

if (tmp == NULL){

778

return NULL;

779

}

780

if(f_len > 0){

781

memcpy(tmp, first, f_len); /* Spurious warning */

782

}

783

tmp[f_len] = '/';

784

if(s_len > 0){

785

memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */

786

}

787

tmp[f_len + 1 + s_len] = '\0';

788

return tmp;

789

}

790

791

792

814

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

793

815

AvahiSServiceBrowser *sb = NULL;

794

816

int error;

800

822

uid_t uid;

801

823

gid_t gid;

802

824

char *connect_to = NULL;

825

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

803

826

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

804

const char *pubkeyfile = "pubkey.txt";

805

const char *seckeyfile = "seckey.txt";

827

const char *seckey = PATHDIR "/" SECKEY;

828

const char *pubkey = PATHDIR "/" PUBKEY;

829

806

830

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

807

.dh_bits = 1024, .priority = "SECURE256"};

831

.dh_bits = 1024, .priority = "SECURE256"

832

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

808

833

bool gnutls_initalized = false;

834

bool gpgme_initalized = false;

809

835

810

836

{

811

837

struct argp_option options[] = {

812

838

{ .name = "debug", .key = 128,

813

839

.doc = "Debug mode", .group = 3 },

814

840

{ .name = "connect", .key = 'c',

815

.arg = "IP",

816

.doc = "Connect directly to a sepcified mandos server",

841

.arg = "ADDRESS:PORT",

842

.doc = "Connect directly to a specific Mandos server",

817

843

.group = 1 },

818

844

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

819

.arg = "INTERFACE",

820

.doc = "Interface that Avahi will conntect through",

821

.group = 1 },

822

{ .name = "keydir", .key = 'd',

823

.arg = "KEYDIR",

824

.doc = "Directory where the openpgp keyring is",

845

.arg = "NAME",

846

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

847

" servers",

825

848

.group = 1 },

826

849

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

827

.arg = "SECKEY",

828

.doc = "Secret openpgp key for gnutls authentication",

850

.arg = "FILE",

851

.doc = "OpenPGP secret key file base name",

829

852

.group = 1 },

830

853

{ .name = "pubkey", .key = 'p',

831

.arg = "PUBKEY",

832

.doc = "Public openpgp key for gnutls authentication",

854

.arg = "FILE",

855

.doc = "OpenPGP public key file base name",

833

856

.group = 2 },

834

857

{ .name = "dh-bits", .key = 129,

835

858

.arg = "BITS",

836

.doc = "dh-bits to use in gnutls communication",

859

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

860

" Diffie-Hellman key exchange",

837

861

.group = 2 },

838

862

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

839

.arg = "PRIORITY",

840

.doc = "GNUTLS priority", .group = 1 },

863

.arg = "STRING",

864

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

865

.group = 1 },

841

866

{ .name = NULL }

842

867

};

843

844

868

845

869

error_t parse_opt (int key, char *arg,

846

870

struct argp_state *state) {

847

871

/* Get the INPUT argument from `argp_parse', which we know is

848

872

a pointer to our plugin list pointer. */

849

873

switch (key) {

850

case 128:

874

case 128: /* --debug */

851

875

debug = true;

852

876

break;

853

case 'c':

877

case 'c': /* --connect */

854

878

connect_to = arg;

855

879

break;

856

case 'i':

880

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

857

881

interface = arg;

858

882

break;

859

case 'd':

860

keydir = arg;

861

break;

862

case 's':

863

seckeyfile = arg;

864

break;

865

case 'p':

866

pubkeyfile = arg;

867

break;

868

case 129:

883

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

884

seckey = arg;

885

break;

886

case 'p': /* --pubkey */

887

pubkey = arg;

888

break;

889

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

869

890

errno = 0;

870

891

mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);

871

892

if (errno){

873

894

exit(EXIT_FAILURE);

874

895

}

875

896

break;

876

case 130:

897

case 130: /* --priority */

877

898

mc.priority = arg;

878

899

break;

879

900

case ARGP_KEY_ARG:

880

901

argp_usage (state);

902

case ARGP_KEY_END:

881

903

break;

882

case ARGP_KEY_END:

883

break;

884

904

default:

885

905

return ARGP_ERR_UNKNOWN;

886

906

}

887

907

return 0;

888

908

}

889

909

890

910

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

891

911

.args_doc = "",

892

912

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

893

" passwords from mandos server" };

894

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

895

}

896

897

pubkeyfile = combinepath(keydir, pubkeyfile);

898

if (pubkeyfile == NULL){

899

perror("combinepath");

900

exitcode = EXIT_FAILURE;

901

goto end;

902

}

903

904

seckeyfile = combinepath(keydir, seckeyfile);

905

if (seckeyfile == NULL){

906

perror("combinepath");

907

goto end;

908

}

909

910

ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);

911

if (ret == -1){

912

fprintf(stderr, "init_gnutls_global\n");

913

goto end;

914

} else {

915

gnutls_initalized = true;

916

}

917

913

" passwords from a Mandos server" };

914

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

915

if (ret == ARGP_ERR_UNKNOWN){

916

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

917

exitcode = EXIT_FAILURE;

918

goto end;

919

}

920

}

921

922

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

923

{

924

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

925

if(sd < 0) {

926

perror("socket");

927

exitcode = EXIT_FAILURE;

928

goto end;

929

}

930

strcpy(network.ifr_name, interface);

931

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

932

if(ret == -1){

933

perror("ioctl SIOCGIFFLAGS");

934

exitcode = EXIT_FAILURE;

935

goto end;

936

}

937

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

938

network.ifr_flags |= IFF_UP;

939

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

940

if(ret == -1){

941

perror("ioctl SIOCSIFFLAGS");

942

exitcode = EXIT_FAILURE;

943

goto end;

944

}

945

}

946

ret = TEMP_FAILURE_RETRY(close(sd));

947

if(ret == -1){

948

perror("close");

949

}

950

}

951

918

952

uid = getuid();

919

953

gid = getgid();

920

954

921

955

ret = setuid(uid);

922

956

if (ret == -1){

923

957

perror("setuid");

928

962

perror("setgid");

929

963

}

930

964

965

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

966

if (ret == -1){

967

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

968

exitcode = EXIT_FAILURE;

969

goto end;

970

} else {

971

gnutls_initalized = true;

972

}

973

974

if(mkdtemp(tempdir) == NULL){

975

perror("mkdtemp");

976

tempdir[0] = '\0';

977

goto end;

978

}

979

980

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

981

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

982

exitcode = EXIT_FAILURE;

983

goto end;

984

} else {

985

gpgme_initalized = true;

986

}

987

931

988

if_index = (AvahiIfIndex) if_nametoindex(interface);

932

989

if(if_index == 0){

933

990

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

961

1018

goto end;

962

1019

}

963

1020

964

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

965

{

966

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

967

if(sd < 0) {

968

perror("socket");

969

exitcode = EXIT_FAILURE;

970

goto end;

971

}

972

strcpy(network.ifr_name, interface); /* Spurious warning */

973

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

974

if(ret == -1){

975

perror("ioctl SIOCGIFFLAGS");

976

exitcode = EXIT_FAILURE;

977

goto end;

978

}

979

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

980

network.ifr_flags |= IFF_UP;

981

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

982

if(ret == -1){

983

perror("ioctl SIOCSIFFLAGS");

984

exitcode = EXIT_FAILURE;

985

goto end;

986

}

987

}

988

close(sd);

989

}

990

991

1021

if (not debug){

992

1022

avahi_set_log_function(empty_log);

993

1023

}

1003

1033

exitcode = EXIT_FAILURE;

1004

1034

goto end;

1005

1035

}

1006

1036

1007

1037

{

1008

1038

AvahiServerConfig config;

1009

1039

/* Do not publish any local Zeroconf records */

1012

1042

config.publish_addresses = 0;

1013

1043

config.publish_workstation = 0;

1014

1044

config.publish_domain = 0;

1015

1045

1016

1046

/* Allocate a new server */

1017

1047

mc.server = avahi_server_new(avahi_simple_poll_get

1018

1048

(mc.simple_poll), &config, NULL,

1019

1049

NULL, &error);

1020

1050

1021

1051

/* Free the Avahi configuration data */

1022

1052

avahi_server_config_free(&config);

1023

1053

}

1043

1073

}

1044

1074

1045

1075

/* Run the main loop */

1046

1076

1047

1077

if (debug){

1048

1078

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

1049

1079

}

1051

1081

avahi_simple_poll_loop(mc.simple_poll);

1052

1082

1053

1083

end:

1054

1084

1055

1085

if (debug){

1056

1086

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

1057

1087

}

1062

1092

1063

1093

if (mc.server != NULL)

1064

1094

avahi_server_free(mc.server);

1065

1095

1066

1096

if (mc.simple_poll != NULL)

1067

1097

avahi_simple_poll_free(mc.simple_poll);

1068

free(pubkeyfile);

1069

free(seckeyfile);

1070

1098

1071

1099

if (gnutls_initalized){

1072

gnutls_certificate_free_credentials (mc.cred);

1100

gnutls_certificate_free_credentials(mc.cred);

1073

1101

gnutls_global_deinit ();

1074

}

1075

1102

gnutls_dh_params_deinit(mc.dh_params);

1103

}

1104

1105

if(gpgme_initalized){

1106

gpgme_release(mc.ctx);

1107

}

1108

1109

/* Removes the temp directory used by GPGME */

1110

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

1111

DIR *d;

1112

struct dirent *direntry;

1113

d = opendir(tempdir);

1114

if(d == NULL){

1115

perror("opendir");

1116

} else {

1117

while(true){

1118

direntry = readdir(d);

1119

if(direntry == NULL){

1120

break;

1121

}

1122

if (direntry->d_type == DT_REG){

1123

char *fullname = NULL;

1124

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

1125

direntry->d_name);

1126

if(ret < 0){

1127

perror("asprintf");

1128

continue;

1129

}

1130

ret = unlink(fullname);

1131

if(ret == -1){

1132

fprintf(stderr, "unlink(\"%s\"): %s",

1133

fullname, strerror(errno));

1134

}

1135

free(fullname);

1136

}

1137

}

1138

closedir(d);

1139

}

1140

ret = rmdir(tempdir);

1141

if(ret == -1){

1142

perror("rmdir");

1143

}

1144

}

1145

1076

1146

return exitcode;

1077

1147

}