/mandos/trunk : revision 174

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>

38

#include <assert.h>

39

#include <stdlib.h>

40

#include <time.h>

41

#include <net/if.h> /* if_nametoindex */

42

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

43

SIOCSIFFLAGS */

37

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

38

stdout, ferror() */

39

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

40

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

41

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

42

srand() */

43

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

44

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

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

46

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

47

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

50

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

51

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

52

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

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struct in6_addr, inet_pton(),

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connect() */

55

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

56

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

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

58

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

59

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

60

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

44

61

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

45

SIOCSIFFLAGS */

62

SIOCSIFFLAGS, if_indextoname(),

63

if_nametoindex(), IF_NAMESIZE */

64

#include <netinet/in.h>

65

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

66

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

67

setgid() */

68

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

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 */

46

74

75

/* Avahi */

76

/* All Avahi types, constants and functions

77

Avahi*, avahi_*,

78

AVAHI_* */

47

79

#include <avahi-core/core.h>

48

80

#include <avahi-core/lookup.h>

49

81

#include <avahi-core/log.h>

51

83

#include <avahi-common/malloc.h>

52

84

#include <avahi-common/error.h>

53

85

54

/* Mandos client part */

55

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

56

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

57

struct in6_addr, inet_pton() */

58

#include <gnutls/gnutls.h> /* All GnuTLS stuff */

59

#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */

86

/* GnuTLS */

87

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

88

functions:

89

gnutls_*

90

init_gnutls_session(),

91

GNUTLS_* */

92

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

93

GNUTLS_OPENPGP_FMT_BASE64 */

60

94

61

#include <unistd.h> /* close() */

62

#include <netinet/in.h>

63

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

64

#include <string.h> /* memset */

65

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

66

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

67

#include <net/if.h> /* IF_NAMESIZE */

68

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

69

struct argp_state, struct argp,

70

argp_parse() */

71

95

/* GPGME */

72

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

73

#include <gpgme.h>

96

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

97

functions:

98

gpgme_*

99

GPGME_PROTOCOL_OpenPGP,

100

GPG_ERR_NO_* */

74

101

75

102

#define BUFFER_SIZE 256

76

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

77

112

bool debug = false;

78

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

79

113

static const char mandos_protocol_version[] = "1";

80

const char *argp_program_version = "mandosclient 0.9";

114

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

81

115

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

82

116

83

117

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

88

122

unsigned int dh_bits;

89

123

gnutls_dh_params_t dh_params;

90

124

const char *priority;

125

gpgme_ctx_t ctx;

91

126

} mandos_context;

92

127

93

128

/*

108

143

}

109

144

110

145

/*

111

* Decrypt OpenPGP data using keyrings in HOMEDIR.

112

* Returns -1 on error

146

* Initialize GPGME.

113

147

*/

114

static ssize_t pgp_packet_decrypt (const char *cryptotext,

115

size_t crypto_size,

116

char **plaintext,

117

const char *homedir){

118

gpgme_data_t dh_crypto, dh_plain;

119

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;

120

151

gpgme_error_t rc;

121

ssize_t ret;

122

size_t plaintext_capacity = 0;

123

ssize_t plaintext_length = 0;

124

152

gpgme_engine_info_t engine_info;

125

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

126

190

if (debug){

127

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

191

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

128

192

}

129

193

130

194

/* Init GPGME */

133

197

if (rc != GPG_ERR_NO_ERROR){

134

198

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

135

199

gpgme_strsource(rc), gpgme_strerror(rc));

136

return -1;

200

return false;

137

201

}

138

202

139

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

203

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

140

204

rc = gpgme_get_engine_info (&engine_info);

141

205

if (rc != GPG_ERR_NO_ERROR){

142

206

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

143

207

gpgme_strsource(rc), gpgme_strerror(rc));

144

return -1;

208

return false;

145

209

}

146

210

while(engine_info != NULL){

147

211

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

148

212

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

149

engine_info->file_name, homedir);

213

engine_info->file_name, tempdir);

150

214

break;

151

215

}

152

216

engine_info = engine_info->next;

153

217

}

154

218

if(engine_info == NULL){

155

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

156

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");

157

254

}

158

255

159

256

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

174

271

return -1;

175

272

}

176

273

177

/* Create new GPGME "context" */

178

rc = gpgme_new(&ctx);

179

if (rc != GPG_ERR_NO_ERROR){

180

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

181

gpgme_strsource(rc), gpgme_strerror(rc));

182

plaintext_length = -1;

183

goto decrypt_end;

184

}

185

186

274

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

187

275

data buffer */

188

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

276

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

189

277

if (rc != GPG_ERR_NO_ERROR){

190

278

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

191

279

gpgme_strsource(rc), gpgme_strerror(rc));

192

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

}

193

309

goto decrypt_end;

194

310

}

195

311

197

313

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

198

314

}

199

315

200

if (debug){

201

gpgme_decrypt_result_t result;

202

result = gpgme_op_decrypt_result(ctx);

203

if (result == NULL){

204

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

205

} else {

206

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

207

result->unsupported_algorithm);

208

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

209

result->wrong_key_usage);

210

if(result->file_name != NULL){

211

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

212

}

213

gpgme_recipient_t recipient;

214

recipient = result->recipients;

215

if(recipient){

216

while(recipient != NULL){

217

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

218

gpgme_pubkey_algo_name(recipient->pubkey_algo));

219

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

220

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

221

recipient->status == GPG_ERR_NO_SECKEY

222

? "No" : "Yes");

223

recipient = recipient->next;

224

}

225

}

226

}

227

}

228

229

316

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

230

317

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

231

318

perror("pgpme_data_seek");

258

345

}

259

346

plaintext_length += ret;

260

347

}

261

348

262

349

if(debug){

263

350

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

264

351

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

278

365

}

279

366

280

367

static const char * safer_gnutls_strerror (int value) {

281

const char *ret = gnutls_strerror (value);

368

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

282

369

if (ret == NULL)

283

370

ret = "(unknown)";

284

371

return ret;

291

378

}

292

379

293

380

static int init_gnutls_global(mandos_context *mc,

294

const char *pubkeyfile,

295

const char *seckeyfile){

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

296

383

int ret;

297

384

298

385

if(debug){

299

386

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

300

387

}

301

302

if ((ret = gnutls_global_init ())

303

!= GNUTLS_E_SUCCESS) {

388

389

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

304

391

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

305

392

safer_gnutls_strerror(ret));

306

393

return -1;

315

402

}

316

403

317

404

/* OpenPGP credentials */

318

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

319

!= GNUTLS_E_SUCCESS) {

320

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 */

321

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

322

411

return -1;

323

412

}

324

413

325

414

if(debug){

326

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

327

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

328

seckeyfile);

415

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

416

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

417

seckeyfilename);

329

418

}

330

419

331

420

ret = gnutls_certificate_set_openpgp_key_file

332

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

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

333

423

if (ret != GNUTLS_E_SUCCESS) {

334

424

fprintf(stderr,

335

425

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

336

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

337

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

426

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

427

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

338

428

safer_gnutls_strerror(ret));

339

return -1;

429

goto globalfail;

340

430

}

341

431

342

432

/* GnuTLS server initialization */

344

434

if (ret != GNUTLS_E_SUCCESS) {

345

435

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

346

436

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

347

return -1;

437

goto globalfail;

348

438

}

349

439

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

350

440

if (ret != GNUTLS_E_SUCCESS) {

351

441

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

352

442

safer_gnutls_strerror(ret));

353

return -1;

443

goto globalfail;

354

444

}

355

445

356

446

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

357

447

358

448

return 0;

449

450

globalfail:

451

452

gnutls_certificate_free_credentials(mc->cred);

453

gnutls_global_deinit();

454

return -1;

359

455

}

360

456

361

457

static int init_gnutls_session(mandos_context *mc,

375

471

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

376

472

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

377

473

safer_gnutls_strerror(ret));

474

gnutls_deinit (*session);

378

475

return -1;

379

476

}

380

477

}

384

481

if (ret != GNUTLS_E_SUCCESS) {

385

482

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

386

483

safer_gnutls_strerror(ret));

484

gnutls_deinit (*session);

387

485

return -1;

388

486

}

389

487

422

520

}

423

521

424

522

if(debug){

425

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

426

ip, port);

523

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

524

"\n", ip, port);

427

525

}

428

526

429

527

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

431

529

perror("socket");

432

530

return -1;

433

531

}

434

532

435

533

if(debug){

436

534

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

437

535

perror("if_indextoname");

440

538

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

441

539

}

442

540

443

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

541

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

444

542

to.in6.sin6_family = AF_INET6;

445

543

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

446

544

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

453

551

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

454

552

return -1;

455

553

}

456

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

554

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

457

555

458

556

to.in6.sin6_scope_id = (uint32_t)if_index;

459

557

460

558

if(debug){

461

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

559

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

560

port);

462

561

char addrstr[INET6_ADDRSTRLEN] = "";

463

562

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

464

563

sizeof(addrstr)) == NULL){

475

574

perror("connect");

476

575

return -1;

477

576

}

478

577

479

578

const char *out = mandos_protocol_version;

480

579

written = 0;

481

580

while (true){

499

598

}

500

599

}

501

600

}

502

601

503

602

if(debug){

504

603

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

505

604

}

506

605

507

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

508

607

509

ret = gnutls_handshake (session);

608

do{

609

ret = gnutls_handshake (session);

610

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

510

611

511

612

if (ret != GNUTLS_E_SUCCESS){

512

613

if(debug){

523

624

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

524

625

ip);

525

626

}

526

627

527

628

while(true){

528

629

buffer_capacity = adjustbuffer(&buffer, buffer_length,

529

630

buffer_capacity);

544

645

case GNUTLS_E_AGAIN:

545

646

break;

546

647

case GNUTLS_E_REHANDSHAKE:

547

ret = gnutls_handshake (session);

648

do{

649

ret = gnutls_handshake (session);

650

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

548

651

if (ret < 0){

549

652

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

550

653

gnutls_perror (ret);

571

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

572

675

573

676

if (buffer_length > 0){

574

decrypted_buffer_size = pgp_packet_decrypt(buffer,

677

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

575

678

buffer_length,

576

&decrypted_buffer,

577

keydir);

679

&decrypted_buffer);

578

680

if (decrypted_buffer_size >= 0){

579

681

written = 0;

580

682

while(written < (size_t) decrypted_buffer_size){

595

697

} else {

596

698

retval = -1;

597

699

}

700

} else {

701

retval = -1;

598

702

}

599

703

600

704

/* Shutdown procedure */

601

705

602

706

mandos_end:

603

707

free(buffer);

604

close(tcp_sd);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

709

if(ret == -1){

710

perror("close");

711

}

605

712

gnutls_deinit (session);

606

gnutls_certificate_free_credentials (mc->cred);

607

gnutls_global_deinit ();

608

713

return retval;

609

714

}

610

715

623

728

flags,

624

729

void* userdata) {

625

730

mandos_context *mc = userdata;

626

assert(r); /* Spurious warning */

731

assert(r);

627

732

628

733

/* Called whenever a service has been resolved successfully or

629

734

timed out */

641

746

char ip[AVAHI_ADDRESS_STR_MAX];

642

747

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

643

748

if(debug){

644

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

645

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

749

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

750

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

751

interface, port);

646

752

}

647

753

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

648

754

if (ret == 0){

649

exit(EXIT_SUCCESS);

755

avahi_simple_poll_quit(mc->simple_poll);

650

756

}

651

757

}

652

758

}

664

770

flags,

665

771

void* userdata) {

666

772

mandos_context *mc = userdata;

667

assert(b); /* Spurious warning */

773

assert(b);

668

774

669

775

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

670

776

is removed from the LAN */

704

810

}

705

811

}

706

812

707

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

708

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

709

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

710

size_t f_len = strlen(first);

711

size_t s_len = strlen(second);

712

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

713

if (tmp == NULL){

714

return NULL;

715

}

716

if(f_len > 0){

717

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

718

}

719

tmp[f_len] = '/';

720

if(s_len > 0){

721

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

722

}

723

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

724

return tmp;

725

}

726

727

728

813

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

729

814

AvahiSServiceBrowser *sb = NULL;

730

815

int error;

736

821

uid_t uid;

737

822

gid_t gid;

738

823

char *connect_to = NULL;

824

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

739

825

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

740

const char *pubkeyfile = "pubkey.txt";

741

const char *seckeyfile = "seckey.txt";

826

const char *seckey = PATHDIR "/" SECKEY;

827

const char *pubkey = PATHDIR "/" PUBKEY;

828

742

829

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

743

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

830

.dh_bits = 1024, .priority = "SECURE256"

831

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

832

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

744

834

745

835

{

746

836

struct argp_option options[] = {

747

837

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

748

838

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

749

839

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

750

.arg = "IP",

751

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

840

.arg = "ADDRESS:PORT",

841

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

752

842

.group = 1 },

753

843

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

754

.arg = "INTERFACE",

755

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

756

.group = 1 },

757

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

758

.arg = "KEYDIR",

759

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

844

.arg = "NAME",

845

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

846

" servers",

760

847

.group = 1 },

761

848

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

762

.arg = "SECKEY",

763

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

849

.arg = "FILE",

850

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

764

851

.group = 1 },

765

852

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

766

.arg = "PUBKEY",

767

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

853

.arg = "FILE",

854

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

768

855

.group = 2 },

769

856

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

770

857

.arg = "BITS",

771

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

858

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

859

" Diffie-Hellman key exchange",

772

860

.group = 2 },

773

861

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

774

.arg = "PRIORITY",

775

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

862

.arg = "STRING",

863

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

864

.group = 1 },

776

865

{ .name = NULL }

777

866

};

778

779

867

780

868

error_t parse_opt (int key, char *arg,

781

869

struct argp_state *state) {

782

870

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

783

871

a pointer to our plugin list pointer. */

784

872

switch (key) {

785

case 128:

873

case 128: /* --debug */

786

874

debug = true;

787

875

break;

788

case 'c':

876

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

789

877

connect_to = arg;

790

878

break;

791

case 'i':

879

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

792

880

interface = arg;

793

881

break;

794

case 'd':

795

keydir = arg;

796

break;

797

case 's':

798

seckeyfile = arg;

799

break;

800

case 'p':

801

pubkeyfile = arg;

802

break;

803

case 129:

882

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

883

seckey = arg;

884

break;

885

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

886

pubkey = arg;

887

break;

888

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

804

889

errno = 0;

805

890

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

806

891

if (errno){

808

893

exit(EXIT_FAILURE);

809

894

}

810

895

break;

811

case 130:

896

case 130: /* --priority */

812

897

mc.priority = arg;

813

898

break;

814

899

case ARGP_KEY_ARG:

815

900

argp_usage (state);

901

case ARGP_KEY_END:

816

902

break;

817

case ARGP_KEY_END:

818

break;

819

903

default:

820

904

return ARGP_ERR_UNKNOWN;

821

905

}

822

906

return 0;

823

907

}

824

908

825

909

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

826

910

.args_doc = "",

827

911

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

828

" passwords from mandos server" };

829

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

830

}

831

832

pubkeyfile = combinepath(keydir, pubkeyfile);

833

if (pubkeyfile == NULL){

834

perror("combinepath");

835

exitcode = EXIT_FAILURE;

836

goto end;

837

}

838

839

seckeyfile = combinepath(keydir, seckeyfile);

840

if (seckeyfile == NULL){

841

perror("combinepath");

842

goto end;

843

}

844

845

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

846

if (ret == -1){

847

fprintf(stderr, "init_gnutls_global\n");

848

goto end;

849

}

850

912

" passwords from a Mandos server" };

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

915

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

916

exitcode = EXIT_FAILURE;

917

goto end;

918

}

919

}

920

921

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

922

{

923

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

924

if(sd < 0) {

925

perror("socket");

926

exitcode = EXIT_FAILURE;

927

goto end;

928

}

929

strcpy(network.ifr_name, interface);

930

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

931

if(ret == -1){

932

perror("ioctl SIOCGIFFLAGS");

933

exitcode = EXIT_FAILURE;

934

goto end;

935

}

936

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

937

network.ifr_flags |= IFF_UP;

938

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

939

if(ret == -1){

940

perror("ioctl SIOCSIFFLAGS");

941

exitcode = EXIT_FAILURE;

942

goto end;

943

}

944

}

945

ret = TEMP_FAILURE_RETRY(close(sd));

946

if(ret == -1){

947

perror("close");

948

}

949

}

950

851

951

uid = getuid();

852

952

gid = getgid();

853

953

854

954

ret = setuid(uid);

855

955

if (ret == -1){

856

956

perror("setuid");

861

961

perror("setgid");

862

962

}

863

963

964

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

965

if (ret == -1){

966

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

967

exitcode = EXIT_FAILURE;

968

goto end;

969

} else {

970

gnutls_initalized = true;

971

}

972

973

if(mkdtemp(tempdir) == NULL){

974

perror("mkdtemp");

975

tempdir[0] = '\0';

976

goto end;

977

}

978

979

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

980

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

981

exitcode = EXIT_FAILURE;

982

goto end;

983

} else {

984

pgpme_initalized = true;

985

}

986

864

987

if_index = (AvahiIfIndex) if_nametoindex(interface);

865

988

if(if_index == 0){

866

989

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

894

1017

goto end;

895

1018

}

896

1019

897

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

898

{

899

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

900

if(sd < 0) {

901

perror("socket");

902

exitcode = EXIT_FAILURE;

903

goto end;

904

}

905

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

906

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

907

if(ret == -1){

908

perror("ioctl SIOCGIFFLAGS");

909

exitcode = EXIT_FAILURE;

910

goto end;

911

}

912

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

913

network.ifr_flags |= IFF_UP;

914

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

915

if(ret == -1){

916

perror("ioctl SIOCSIFFLAGS");

917

exitcode = EXIT_FAILURE;

918

goto end;

919

}

920

}

921

close(sd);

922

}

923

924

1020

if (not debug){

925

1021

avahi_set_log_function(empty_log);

926

1022

}

936

1032

exitcode = EXIT_FAILURE;

937

1033

goto end;

938

1034

}

939

1035

940

1036

{

941

1037

AvahiServerConfig config;

942

1038

/* Do not publish any local Zeroconf records */

945

1041

config.publish_addresses = 0;

946

1042

config.publish_workstation = 0;

947

1043

config.publish_domain = 0;

948

1044

949

1045

/* Allocate a new server */

950

1046

mc.server = avahi_server_new(avahi_simple_poll_get

951

1047

(mc.simple_poll), &config, NULL,

952

1048

NULL, &error);

953

1049

954

1050

/* Free the Avahi configuration data */

955

1051

avahi_server_config_free(&config);

956

1052

}

976

1072

}

977

1073

978

1074

/* Run the main loop */

979

1075

980

1076

if (debug){

981

1077

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

982

1078

}

984

1080

avahi_simple_poll_loop(mc.simple_poll);

985

1081

986

1082

end:

987

1083

988

1084

if (debug){

989

1085

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

990

1086

}

995

1091

996

1092

if (mc.server != NULL)

997

1093

avahi_server_free(mc.server);

998

1094

999

1095

if (mc.simple_poll != NULL)

1000

1096

avahi_simple_poll_free(mc.simple_poll);

1001

free(pubkeyfile);

1002

free(seckeyfile);

1003

1097

1098

if (gnutls_initalized){

1099

gnutls_certificate_free_credentials(mc.cred);

1100

gnutls_global_deinit ();

1101

}

1102

1103

if(pgpme_initalized){

1104

gpgme_release(mc.ctx);

1105

}

1106

1107

/* Removes the temp directory used by GPGME */

1108

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

1109

DIR *d;

1110

struct dirent *direntry;

1111

d = opendir(tempdir);

1112

if(d == NULL){

1113

perror("opendir");

1114

} else {

1115

while(true){

1116

direntry = readdir(d);

1117

if(direntry == NULL){

1118

break;

1119

}

1120

if (direntry->d_type == DT_REG){

1121

char *fullname = NULL;

1122

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

1123

direntry->d_name);

1124

if(ret < 0){

1125

perror("asprintf");

1126

continue;

1127

}

1128

ret = unlink(fullname);

1129

if(ret == -1){

1130

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

1131

fullname, strerror(errno));

1132

}

1133

free(fullname);

1134

}

1135

}

1136

}

1137

ret = rmdir(tempdir);

1138

if(ret == -1){

1139

perror("rmdir");

1140

}

1141

}

1142

1004

1143

return exitcode;

1005

1144

}