/mandos/release : revision 179

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(),

45

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,

49

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,

53

struct in6_addr, inet_pton(),

54

connect() */

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() */

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

const char *argp_program_version = "mandosclient 0.9";

113

static const char mandos_protocol_version[] = "1";

114

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

80

115

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

81

static const char mandos_protocol_version[] = "1";

82

116

83

117

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

84

118

typedef struct {

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

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

128

/*

129

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

94

130

* "buffer_capacity" is how much is currently allocated,

95

* "buffer_length" is how much is already used. */

131

* "buffer_length" is how much is already used.

132

*/

96

133

size_t adjustbuffer(char **buffer, size_t buffer_length,

97

134

size_t buffer_capacity){

98

135

if (buffer_length + BUFFER_SIZE > buffer_capacity){

106

143

}

107

144

108

145

/*

109

* Decrypt OpenPGP data using keyrings in HOMEDIR.

110

* Returns -1 on error

146

* Initialize GPGME.

111

147

*/

112

static ssize_t pgp_packet_decrypt (const char *cryptotext,

113

size_t crypto_size,

114

char **plaintext,

115

const char *homedir){

116

gpgme_data_t dh_crypto, dh_plain;

117

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;

118

151

gpgme_error_t rc;

119

ssize_t ret;

120

size_t plaintext_capacity = 0;

121

ssize_t plaintext_length = 0;

122

152

gpgme_engine_info_t engine_info;

123

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

124

190

if (debug){

125

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

191

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

126

192

}

127

193

128

194

/* Init GPGME */

131

197

if (rc != GPG_ERR_NO_ERROR){

132

198

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

133

199

gpgme_strsource(rc), gpgme_strerror(rc));

134

return -1;

200

return false;

135

201

}

136

202

137

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

203

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

138

204

rc = gpgme_get_engine_info (&engine_info);

139

205

if (rc != GPG_ERR_NO_ERROR){

140

206

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

141

207

gpgme_strsource(rc), gpgme_strerror(rc));

142

return -1;

208

return false;

143

209

}

144

210

while(engine_info != NULL){

145

211

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

146

212

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

147

engine_info->file_name, homedir);

213

engine_info->file_name, tempdir);

148

214

break;

149

215

}

150

216

engine_info = engine_info->next;

151

217

}

152

218

if(engine_info == NULL){

153

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

154

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");

155

254

}

156

255

157

256

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

172

271

return -1;

173

272

}

174

273

175

/* Create new GPGME "context" */

176

rc = gpgme_new(&ctx);

177

if (rc != GPG_ERR_NO_ERROR){

178

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

179

gpgme_strsource(rc), gpgme_strerror(rc));

180

plaintext_length = -1;

181

goto decrypt_end;

182

}

183

184

274

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

185

275

data buffer */

186

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

276

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

187

277

if (rc != GPG_ERR_NO_ERROR){

188

278

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

189

279

gpgme_strsource(rc), gpgme_strerror(rc));

190

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

}

191

309

goto decrypt_end;

192

310

}

193

311

195

313

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

196

314

}

197

315

198

if (debug){

199

gpgme_decrypt_result_t result;

200

result = gpgme_op_decrypt_result(ctx);

201

if (result == NULL){

202

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

203

} else {

204

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

205

result->unsupported_algorithm);

206

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

207

result->wrong_key_usage);

208

if(result->file_name != NULL){

209

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

210

}

211

gpgme_recipient_t recipient;

212

recipient = result->recipients;

213

if(recipient){

214

while(recipient != NULL){

215

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

216

gpgme_pubkey_algo_name(recipient->pubkey_algo));

217

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

218

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

219

recipient->status == GPG_ERR_NO_SECKEY

220

? "No" : "Yes");

221

recipient = recipient->next;

222

}

223

}

224

}

225

}

226

227

316

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

228

317

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

229

perror("pgpme_data_seek");

318

perror("gpgme_data_seek");

230

319

plaintext_length = -1;

231

320

goto decrypt_end;

232

321

}

256

345

}

257

346

plaintext_length += ret;

258

347

}

259

348

260

349

if(debug){

261

350

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

262

351

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

276

365

}

277

366

278

367

static const char * safer_gnutls_strerror (int value) {

279

const char *ret = gnutls_strerror (value);

368

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

280

369

if (ret == NULL)

281

370

ret = "(unknown)";

282

371

return ret;

289

378

}

290

379

291

380

static int init_gnutls_global(mandos_context *mc,

292

const char *pubkeyfile,

293

const char *seckeyfile){

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

294

383

int ret;

295

384

296

385

if(debug){

297

386

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

298

387

}

299

300

if ((ret = gnutls_global_init ())

301

!= GNUTLS_E_SUCCESS) {

388

389

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

302

391

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

303

392

safer_gnutls_strerror(ret));

304

393

return -1;

313

402

}

314

403

315

404

/* OpenPGP credentials */

316

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

317

!= GNUTLS_E_SUCCESS) {

318

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 */

319

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

320

411

return -1;

321

412

}

322

413

323

414

if(debug){

324

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

325

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

326

seckeyfile);

415

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

416

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

417

seckeyfilename);

327

418

}

328

419

329

420

ret = gnutls_certificate_set_openpgp_key_file

330

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

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

331

423

if (ret != GNUTLS_E_SUCCESS) {

332

424

fprintf(stderr,

333

425

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

334

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

335

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

426

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

427

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

336

428

safer_gnutls_strerror(ret));

337

return -1;

429

goto globalfail;

338

430

}

339

431

340

432

/* GnuTLS server initialization */

342

434

if (ret != GNUTLS_E_SUCCESS) {

343

435

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

344

436

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

345

return -1;

437

goto globalfail;

346

438

}

347

439

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

348

440

if (ret != GNUTLS_E_SUCCESS) {

349

441

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

350

442

safer_gnutls_strerror(ret));

351

return -1;

443

goto globalfail;

352

444

}

353

445

354

446

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

355

447

356

448

return 0;

449

450

globalfail:

451

452

gnutls_certificate_free_credentials(mc->cred);

453

gnutls_global_deinit();

454

gnutls_dh_params_deinit(mc->dh_params);

455

return -1;

357

456

}

358

457

359

458

static int init_gnutls_session(mandos_context *mc,

373

472

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

374

473

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

375

474

safer_gnutls_strerror(ret));

475

gnutls_deinit (*session);

376

476

return -1;

377

477

}

378

478

}

382

482

if (ret != GNUTLS_E_SUCCESS) {

383

483

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

384

484

safer_gnutls_strerror(ret));

485

gnutls_deinit (*session);

385

486

return -1;

386

487

}

387

488

420

521

}

421

522

422

523

if(debug){

423

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

424

ip, port);

524

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

525

"\n", ip, port);

425

526

}

426

527

427

528

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

429

530

perror("socket");

430

531

return -1;

431

532

}

432

533

433

534

if(debug){

434

535

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

435

536

perror("if_indextoname");

438

539

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

439

540

}

440

541

441

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

542

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

442

543

to.in6.sin6_family = AF_INET6;

443

544

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

444

545

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

451

552

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

452

553

return -1;

453

554

}

454

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

555

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

455

556

456

557

to.in6.sin6_scope_id = (uint32_t)if_index;

457

558

458

559

if(debug){

459

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

560

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

561

port);

460

562

char addrstr[INET6_ADDRSTRLEN] = "";

461

563

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

462

564

sizeof(addrstr)) == NULL){

473

575

perror("connect");

474

576

return -1;

475

577

}

476

578

477

579

const char *out = mandos_protocol_version;

478

580

written = 0;

479

581

while (true){

497

599

}

498

600

}

499

601

}

500

602

501

603

if(debug){

502

604

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

503

605

}

504

606

505

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

506

608

507

ret = gnutls_handshake (session);

609

do{

610

ret = gnutls_handshake (session);

611

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

508

612

509

613

if (ret != GNUTLS_E_SUCCESS){

510

614

if(debug){

521

625

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

522

626

ip);

523

627

}

524

628

525

629

while(true){

526

630

buffer_capacity = adjustbuffer(&buffer, buffer_length,

527

631

buffer_capacity);

542

646

case GNUTLS_E_AGAIN:

543

647

break;

544

648

case GNUTLS_E_REHANDSHAKE:

545

ret = gnutls_handshake (session);

649

do{

650

ret = gnutls_handshake (session);

651

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

546

652

if (ret < 0){

547

653

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

548

654

gnutls_perror (ret);

569

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

570

676

571

677

if (buffer_length > 0){

572

decrypted_buffer_size = pgp_packet_decrypt(buffer,

678

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

573

679

buffer_length,

574

&decrypted_buffer,

575

keydir);

680

&decrypted_buffer);

576

681

if (decrypted_buffer_size >= 0){

577

682

written = 0;

578

683

while(written < (size_t) decrypted_buffer_size){

593

698

} else {

594

699

retval = -1;

595

700

}

701

} else {

702

retval = -1;

596

703

}

597

704

598

705

/* Shutdown procedure */

599

706

600

707

mandos_end:

601

708

free(buffer);

602

close(tcp_sd);

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

710

if(ret == -1){

711

perror("close");

712

}

603

713

gnutls_deinit (session);

604

gnutls_certificate_free_credentials (mc->cred);

605

gnutls_global_deinit ();

606

714

return retval;

607

715

}

608

716

621

729

flags,

622

730

void* userdata) {

623

731

mandos_context *mc = userdata;

624

assert(r); /* Spurious warning */

732

assert(r);

625

733

626

734

/* Called whenever a service has been resolved successfully or

627

735

timed out */

639

747

char ip[AVAHI_ADDRESS_STR_MAX];

640

748

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

641

749

if(debug){

642

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

643

" 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);

644

753

}

645

754

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

646

755

if (ret == 0){

647

exit(EXIT_SUCCESS);

756

avahi_simple_poll_quit(mc->simple_poll);

648

757

}

649

758

}

650

759

}

662

771

flags,

663

772

void* userdata) {

664

773

mandos_context *mc = userdata;

665

assert(b); /* Spurious warning */

774

assert(b);

666

775

667

776

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

668

777

is removed from the LAN */

702

811

}

703

812

}

704

813

705

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

706

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

707

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

708

size_t f_len = strlen(first);

709

size_t s_len = strlen(second);

710

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

711

if (tmp == NULL){

712

return NULL;

713

}

714

if(f_len > 0){

715

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

716

}

717

tmp[f_len] = '/';

718

if(s_len > 0){

719

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

720

}

721

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

722

return tmp;

723

}

724

725

726

814

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

727

815

AvahiSServiceBrowser *sb = NULL;

728

816

int error;

734

822

uid_t uid;

735

823

gid_t gid;

736

824

char *connect_to = NULL;

825

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

737

826

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

738

const char *pubkeyfile = "pubkey.txt";

739

const char *seckeyfile = "seckey.txt";

827

const char *seckey = PATHDIR "/" SECKEY;

828

const char *pubkey = PATHDIR "/" PUBKEY;

829

740

830

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

741

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

831

.dh_bits = 1024, .priority = "SECURE256"

832

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

833

bool gnutls_initalized = false;

834

bool gpgme_initalized = false;

742

835

743

836

{

744

837

struct argp_option options[] = {

745

838

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

746

839

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

747

840

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

748

.arg = "IP",

749

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

841

.arg = "ADDRESS:PORT",

842

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

750

843

.group = 1 },

751

844

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

752

.arg = "INTERFACE",

753

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

754

.group = 1 },

755

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

756

.arg = "KEYDIR",

757

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

845

.arg = "NAME",

846

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

847

" servers",

758

848

.group = 1 },

759

849

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

760

.arg = "SECKEY",

761

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

850

.arg = "FILE",

851

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

762

852

.group = 1 },

763

853

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

764

.arg = "PUBKEY",

765

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

854

.arg = "FILE",

855

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

766

856

.group = 2 },

767

857

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

768

858

.arg = "BITS",

769

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

859

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

860

" Diffie-Hellman key exchange",

770

861

.group = 2 },

771

862

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

772

.arg = "PRIORITY",

773

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

863

.arg = "STRING",

864

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

865

.group = 1 },

774

866

{ .name = NULL }

775

867

};

776

777

868

778

869

error_t parse_opt (int key, char *arg,

779

870

struct argp_state *state) {

780

871

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

781

872

a pointer to our plugin list pointer. */

782

873

switch (key) {

783

case 128:

874

case 128: /* --debug */

784

875

debug = true;

785

876

break;

786

case 'c':

877

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

787

878

connect_to = arg;

788

879

break;

789

case 'i':

880

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

790

881

interface = arg;

791

882

break;

792

case 'd':

793

keydir = arg;

794

break;

795

case 's':

796

seckeyfile = arg;

797

break;

798

case 'p':

799

pubkeyfile = arg;

800

break;

801

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 */

802

890

errno = 0;

803

891

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

804

892

if (errno){

806

894

exit(EXIT_FAILURE);

807

895

}

808

896

break;

809

case 130:

897

case 130: /* --priority */

810

898

mc.priority = arg;

811

899

break;

812

900

case ARGP_KEY_ARG:

813

901

argp_usage (state);

902

case ARGP_KEY_END:

814

903

break;

815

case ARGP_KEY_END:

816

break;

817

904

default:

818

905

return ARGP_ERR_UNKNOWN;

819

906

}

820

907

return 0;

821

908

}

822

909

823

910

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

824

911

.args_doc = "",

825

912

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

826

" passwords from mandos server" };

827

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

828

}

829

830

pubkeyfile = combinepath(keydir, pubkeyfile);

831

if (pubkeyfile == NULL){

832

perror("combinepath");

833

exitcode = EXIT_FAILURE;

834

goto end;

835

}

836

837

seckeyfile = combinepath(keydir, seckeyfile);

838

if (seckeyfile == NULL){

839

perror("combinepath");

840

goto end;

841

}

842

843

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

844

if (ret == -1){

845

fprintf(stderr, "init_gnutls_global\n");

846

goto end;

847

}

848

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

849

952

uid = getuid();

850

953

gid = getgid();

851

954

852

955

ret = setuid(uid);

853

956

if (ret == -1){

854

957

perror("setuid");

859

962

perror("setgid");

860

963

}

861

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

862

988

if_index = (AvahiIfIndex) if_nametoindex(interface);

863

989

if(if_index == 0){

864

990

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

892

1018

goto end;

893

1019

}

894

1020

895

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

896

{

897

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

898

if(sd < 0) {

899

perror("socket");

900

exitcode = EXIT_FAILURE;

901

goto end;

902

}

903

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

904

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

905

if(ret == -1){

906

perror("ioctl SIOCGIFFLAGS");

907

exitcode = EXIT_FAILURE;

908

goto end;

909

}

910

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

911

network.ifr_flags |= IFF_UP;

912

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

913

if(ret == -1){

914

perror("ioctl SIOCSIFFLAGS");

915

exitcode = EXIT_FAILURE;

916

goto end;

917

}

918

}

919

close(sd);

920

}

921

922

1021

if (not debug){

923

1022

avahi_set_log_function(empty_log);

924

1023

}

934

1033

exitcode = EXIT_FAILURE;

935

1034

goto end;

936

1035

}

937

1036

938

1037

{

939

1038

AvahiServerConfig config;

940

1039

/* Do not publish any local Zeroconf records */

943

1042

config.publish_addresses = 0;

944

1043

config.publish_workstation = 0;

945

1044

config.publish_domain = 0;

946

1045

947

1046

/* Allocate a new server */

948

1047

mc.server = avahi_server_new(avahi_simple_poll_get

949

1048

(mc.simple_poll), &config, NULL,

950

1049

NULL, &error);

951

1050

952

1051

/* Free the Avahi configuration data */

953

1052

avahi_server_config_free(&config);

954

1053

}

974

1073

}

975

1074

976

1075

/* Run the main loop */

977

1076

978

1077

if (debug){

979

1078

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

980

1079

}

982

1081

avahi_simple_poll_loop(mc.simple_poll);

983

1082

984

1083

end:

985

1084

986

1085

if (debug){

987

1086

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

988

1087

}

993

1092

994

1093

if (mc.server != NULL)

995

1094

avahi_server_free(mc.server);

996

1095

997

1096

if (mc.simple_poll != NULL)

998

1097

avahi_simple_poll_free(mc.simple_poll);

999

free(pubkeyfile);

1000

free(seckeyfile);

1001

1098

1099

if (gnutls_initalized){

1100

gnutls_certificate_free_credentials(mc.cred);

1101

gnutls_global_deinit ();

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

1002

1146

return exitcode;

1003

1147

}