/mandos/release : revision 134

32

#define _LARGEFILE_SOURCE

33

#define _FILE_OFFSET_BITS 64

34

35

#include <stdio.h>

36

#include <assert.h>

37

#include <stdlib.h>

38

#include <time.h>

39

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

40

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

41

SIOCSIFFLAGS */

35

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

36

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,

48

sockaddr_in6, PF_INET6,

49

SOCK_STREAM, INET6_ADDRSTRLEN,

50

uid_t, gid_t */

51

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

52

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

53

struct in6_addr, inet_pton(),

54

connect() */

55

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

56

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

57

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

42

58

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

43

SIOCSIFFLAGS */

59

SIOCSIFFLAGS, if_indextoname(),

60

if_nametoindex(), IF_NAMESIZE */

61

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

62

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

63

setgid() */

64

#include <netinet/in.h>

65

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

66

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

67

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

68

argp_state, struct argp,

69

argp_parse(), ARGP_KEY_ARG,

70

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

44

71

72

/* Avahi */

73

/* All Avahi types, constants and functions

74

Avahi*, avahi_*,

75

AVAHI_* */

45

76

#include <avahi-core/core.h>

46

77

#include <avahi-core/lookup.h>

47

78

#include <avahi-core/log.h>

49

80

#include <avahi-common/malloc.h>

50

81

#include <avahi-common/error.h>

51

82

52

/* Mandos client part */

53

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

54

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

55

struct in6_addr, inet_pton() */

56

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

57

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

58

59

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

60

#include <netinet/in.h>

61

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

62

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

63

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

64

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

65

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

83

/* GnuTLS */

84

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

85

functions:

86

gnutls_*

87

init_gnutls_session(),

88

GNUTLS_* */

89

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

90

GNUTLS_OPENPGP_FMT_BASE64 */

66

91

67

92

/* GPGME */

68

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

69

#include <gpgme.h>

70

71

/* getopt_long */

72

#include <getopt.h>

93

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

94

functions:

95

gpgme_*

96

GPGME_PROTOCOL_OpenPGP,

97

GPG_ERR_NO_* */

73

98

74

99

#define BUFFER_SIZE 256

75

100

101

bool debug = false;

76

102

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

77

static const char *pubkeyfile = "pubkey.txt";

78

static const char *seckeyfile = "seckey.txt";

79

80

bool debug = false;

81

82

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

103

static const char mandos_protocol_version[] = "1";

104

const char *argp_program_version = "password-request 1.0";

105

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

106

107

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

83

108

typedef struct {

84

109

AvahiSimplePoll *simple_poll;

85

110

AvahiServer *server;

86

111

gnutls_certificate_credentials_t cred;

87

112

unsigned int dh_bits;

113

gnutls_dh_params_t dh_params;

88

114

const char *priority;

89

115

} mandos_context;

90

116

117

/*

118

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

119

* "buffer_capacity" is how much is currently allocated,

120

* "buffer_length" is how much is already used.

121

*/

122

size_t adjustbuffer(char **buffer, size_t buffer_length,

123

size_t buffer_capacity){

124

if (buffer_length + BUFFER_SIZE > buffer_capacity){

125

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

126

if (buffer == NULL){

127

return 0;

128

}

129

buffer_capacity += BUFFER_SIZE;

130

}

131

return buffer_capacity;

132

}

133

91

134

/*

92

135

* Decrypt OpenPGP data using keyrings in HOMEDIR.

93

136

* Returns -1 on error

171

214

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

172

215

gpgme_strsource(rc), gpgme_strerror(rc));

173

216

plaintext_length = -1;

217

if (debug){

218

gpgme_decrypt_result_t result;

219

result = gpgme_op_decrypt_result(ctx);

220

if (result == NULL){

221

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

222

} else {

223

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

224

result->unsupported_algorithm);

225

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

226

result->wrong_key_usage);

227

if(result->file_name != NULL){

228

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

229

}

230

gpgme_recipient_t recipient;

231

recipient = result->recipients;

232

if(recipient){

233

while(recipient != NULL){

234

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

235

gpgme_pubkey_algo_name(recipient->pubkey_algo));

236

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

237

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

238

recipient->status == GPG_ERR_NO_SECKEY

239

? "No" : "Yes");

240

recipient = recipient->next;

241

}

242

}

243

}

244

}

174

245

goto decrypt_end;

175

246

}

176

247

178

249

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

179

250

}

180

251

181

if (debug){

182

gpgme_decrypt_result_t result;

183

result = gpgme_op_decrypt_result(ctx);

184

if (result == NULL){

185

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

186

} else {

187

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

188

result->unsupported_algorithm);

189

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

190

result->wrong_key_usage);

191

if(result->file_name != NULL){

192

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

193

}

194

gpgme_recipient_t recipient;

195

recipient = result->recipients;

196

if(recipient){

197

while(recipient != NULL){

198

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

199

gpgme_pubkey_algo_name(recipient->pubkey_algo));

200

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

201

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

202

recipient->status == GPG_ERR_NO_SECKEY

203

? "No" : "Yes");

204

recipient = recipient->next;

205

}

206

}

207

}

208

}

209

210

252

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

211

253

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

212

254

perror("pgpme_data_seek");

216

258

217

259

*plaintext = NULL;

218

260

while(true){

219

if (plaintext_length + BUFFER_SIZE

220

> (ssize_t) plaintext_capacity){

221

*plaintext = realloc(*plaintext, plaintext_capacity

222

+ BUFFER_SIZE);

223

if (*plaintext == NULL){

224

perror("realloc");

261

plaintext_capacity = adjustbuffer(plaintext,

262

(size_t)plaintext_length,

263

plaintext_capacity);

264

if (plaintext_capacity == 0){

265

perror("adjustbuffer");

225

266

plaintext_length = -1;

226

267

goto decrypt_end;

227

}

228

plaintext_capacity += BUFFER_SIZE;

229

268

}

230

269

231

270

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

262

301

}

263

302

264

303

static const char * safer_gnutls_strerror (int value) {

265

const char *ret = gnutls_strerror (value);

304

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

266

305

if (ret == NULL)

267

306

ret = "(unknown)";

268

307

return ret;

274

313

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

275

314

}

276

315

277

static int initgnutls(mandos_context *mc, gnutls_session_t *session,

278

gnutls_dh_params_t *dh_params){

316

static int init_gnutls_global(mandos_context *mc,

317

const char *pubkeyfilename,

318

const char *seckeyfilename){

279

319

int ret;

280

320

281

321

if(debug){

282

322

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

283

323

}

284

285

if ((ret = gnutls_global_init ())

286

!= GNUTLS_E_SUCCESS) {

324

325

ret = gnutls_global_init();

326

if (ret != GNUTLS_E_SUCCESS) {

287

327

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

288

328

safer_gnutls_strerror(ret));

289

329

return -1;

298

338

}

299

339

300

340

/* OpenPGP credentials */

301

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

302

!= GNUTLS_E_SUCCESS) {

303

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

341

gnutls_certificate_allocate_credentials(&mc->cred);

342

if (ret != GNUTLS_E_SUCCESS){

343

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

344

warning */

304

345

safer_gnutls_strerror(ret));

346

gnutls_global_deinit ();

305

347

return -1;

306

348

}

307

349

308

350

if(debug){

309

351

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

310

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

311

seckeyfile);

352

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

353

seckeyfilename);

312

354

}

313

355

314

356

ret = gnutls_certificate_set_openpgp_key_file

315

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

357

(mc->cred, pubkeyfilename, seckeyfilename,

358

GNUTLS_OPENPGP_FMT_BASE64);

316

359

if (ret != GNUTLS_E_SUCCESS) {

317

360

fprintf(stderr,

318

361

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

319

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

362

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

320

363

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

321

364

safer_gnutls_strerror(ret));

322

return -1;

365

goto globalfail;

323

366

}

324

367

325

368

/* GnuTLS server initialization */

326

ret = gnutls_dh_params_init(dh_params);

369

ret = gnutls_dh_params_init(&mc->dh_params);

327

370

if (ret != GNUTLS_E_SUCCESS) {

328

371

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

329

372

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

330

return -1;

373

goto globalfail;

331

374

}

332

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

375

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

333

376

if (ret != GNUTLS_E_SUCCESS) {

334

377

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

335

378

safer_gnutls_strerror(ret));

336

return -1;

379

goto globalfail;

337

380

}

338

381

339

gnutls_certificate_set_dh_params(mc->cred, *dh_params);

340

382

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

383

384

return 0;

385

386

globalfail:

387

388

gnutls_certificate_free_credentials(mc->cred);

389

gnutls_global_deinit();

390

return -1;

391

392

}

393

394

static int init_gnutls_session(mandos_context *mc,

395

gnutls_session_t *session){

396

int ret;

341

397

/* GnuTLS session creation */

342

398

ret = gnutls_init(session, GNUTLS_SERVER);

343

399

if (ret != GNUTLS_E_SUCCESS){

352

408

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

353

409

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

354

410

safer_gnutls_strerror(ret));

411

gnutls_deinit (*session);

355

412

return -1;

356

413

}

357

414

}

361

418

if (ret != GNUTLS_E_SUCCESS) {

362

419

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

363

420

safer_gnutls_strerror(ret));

421

gnutls_deinit (*session);

364

422

return -1;

365

423

}

366

424

382

440

AvahiIfIndex if_index,

383

441

mandos_context *mc){

384

442

int ret, tcp_sd;

385

struct sockaddr_in6 to;

443

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

386

444

char *buffer = NULL;

387

445

char *decrypted_buffer;

388

446

size_t buffer_length = 0;

389

447

size_t buffer_capacity = 0;

390

448

ssize_t decrypted_buffer_size;

391

size_t written = 0;

449

size_t written;

392

450

int retval = 0;

393

451

char interface[IF_NAMESIZE];

394

452

gnutls_session_t session;

395

gnutls_dh_params_t dh_params;

396

453

397

ret = initgnutls (mc, &session, &dh_params);

454

ret = init_gnutls_session (mc, &session);

398

455

if (ret != 0){

399

456

return -1;

400

457

}

401

458

402

459

if(debug){

403

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

404

ip, port);

460

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

461

"\n", ip, port);

405

462

}

406

463

407

464

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

418

475

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

419

476

}

420

477

421

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

422

to.sin6_family = AF_INET6;

478

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

479

to.in6.sin6_family = AF_INET6;

423

480

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

424

481

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

425

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

482

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

426

483

if (ret < 0 ){

427

484

perror("inet_pton");

428

485

return -1;

431

488

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

432

489

return -1;

433

490

}

434

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

491

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

435

492

436

to.sin6_scope_id = (uint32_t)if_index;

493

to.in6.sin6_scope_id = (uint32_t)if_index;

437

494

438

495

if(debug){

439

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

496

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

497

port);

440

498

char addrstr[INET6_ADDRSTRLEN] = "";

441

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

499

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

442

500

sizeof(addrstr)) == NULL){

443

501

perror("inet_ntop");

444

502

} else {

448

506

}

449

507

}

450

508

451

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

509

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

452

510

if (ret < 0){

453

511

perror("connect");

454

512

return -1;

455

513

}

456

514

515

const char *out = mandos_protocol_version;

516

written = 0;

517

while (true){

518

size_t out_size = strlen(out);

519

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

520

out_size - written));

521

if (ret == -1){

522

perror("write");

523

retval = -1;

524

goto mandos_end;

525

}

526

written += (size_t)ret;

527

if(written < out_size){

528

continue;

529

} else {

530

if (out == mandos_protocol_version){

531

written = 0;

532

out = "\r\n";

533

} else {

534

break;

535

}

536

}

537

}

538

457

539

if(debug){

458

540

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

459

541

}

460

542

461

543

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

462

463

ret = gnutls_handshake (session);

544

545

do{

546

ret = gnutls_handshake (session);

547

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

464

548

465

549

if (ret != GNUTLS_E_SUCCESS){

466

550

if(debug){

479

563

}

480

564

481

565

while(true){

482

if (buffer_length + BUFFER_SIZE > buffer_capacity){

483

buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);

484

if (buffer == NULL){

485

perror("realloc");

486

retval = -1;

487

goto mandos_end;

488

}

489

buffer_capacity += BUFFER_SIZE;

566

buffer_capacity = adjustbuffer(&buffer, buffer_length,

567

buffer_capacity);

568

if (buffer_capacity == 0){

569

perror("adjustbuffer");

570

retval = -1;

571

goto mandos_end;

490

572

}

491

573

492

574

ret = gnutls_record_recv(session, buffer+buffer_length,

500

582

case GNUTLS_E_AGAIN:

501

583

break;

502

584

case GNUTLS_E_REHANDSHAKE:

503

ret = gnutls_handshake (session);

585

do{

586

ret = gnutls_handshake (session);

587

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

504

588

if (ret < 0){

505

589

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

506

590

gnutls_perror (ret);

532

616

&decrypted_buffer,

533

617

keydir);

534

618

if (decrypted_buffer_size >= 0){

619

written = 0;

535

620

while(written < (size_t) decrypted_buffer_size){

536

621

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

537

622

(size_t)decrypted_buffer_size - written,

550

635

} else {

551

636

retval = -1;

552

637

}

638

} else {

639

retval = -1;

553

640

}

554

641

555

642

/* Shutdown procedure */

558

645

free(buffer);

559

646

close(tcp_sd);

560

647

gnutls_deinit (session);

561

gnutls_certificate_free_credentials (mc->cred);

562

gnutls_global_deinit ();

563

648

return retval;

564

649

}

565

650

578

663

flags,

579

664

void* userdata) {

580

665

mandos_context *mc = userdata;

581

assert(r); /* Spurious warning */

666

assert(r);

582

667

583

668

/* Called whenever a service has been resolved successfully or

584

669

timed out */

596

681

char ip[AVAHI_ADDRESS_STR_MAX];

597

682

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

598

683

if(debug){

599

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

600

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

684

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

685

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

686

interface, port);

601

687

}

602

688

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

603

689

if (ret == 0){

604

exit(EXIT_SUCCESS);

690

avahi_simple_poll_quit(mc->simple_poll);

605

691

}

606

692

}

607

693

}

619

705

flags,

620

706

void* userdata) {

621

707

mandos_context *mc = userdata;

622

assert(b); /* Spurious warning */

708

assert(b);

623

709

624

710

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

625

711

is removed from the LAN */

661

747

662

748

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

663

749

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

664

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

665

size_t f_len = strlen(first);

666

size_t s_len = strlen(second);

667

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

668

if (tmp == NULL){

750

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

751

char *tmp;

752

int ret = asprintf(&tmp, "%s/%s", first, second);

753

if(ret < 0){

669

754

return NULL;

670

755

}

671

if(f_len > 0){

672

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

673

}

674

tmp[f_len] = '/';

675

if(s_len > 0){

676

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

677

}

678

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

679

756

return tmp;

680

757

}

681

758

688

765

const char *interface = "eth0";

689

766

struct ifreq network;

690

767

int sd;

768

uid_t uid;

769

gid_t gid;

691

770

char *connect_to = NULL;

692

771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

772

char *pubkeyfilename = NULL;

773

char *seckeyfilename = NULL;

774

const char *pubkeyname = "pubkey.txt";

775

const char *seckeyname = "seckey.txt";

693

776

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

694

777

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

778

bool gnutls_initalized = false;

695

779

696

780

{

697

/* Temporary int to get the address of for getopt_long */

698

int debug_int = debug ? 1 : 0;

699

while (true){

700

struct option long_options[] = {

701

{"debug", no_argument, &debug_int, 1},

702

{"connect", required_argument, NULL, 'c'},

703

{"interface", required_argument, NULL, 'i'},

704

{"keydir", required_argument, NULL, 'd'},

705

{"seckey", required_argument, NULL, 's'},

706

{"pubkey", required_argument, NULL, 'p'},

707

{"dh-bits", required_argument, NULL, 'D'},

708

{"priority", required_argument, NULL, 'P'},

709

{0, 0, 0, 0} };

710

711

int option_index = 0;

712

ret = getopt_long (argc, argv, "i:", long_options,

713

&option_index);

714

715

if (ret == -1){

781

struct argp_option options[] = {

782

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

783

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

784

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

785

.arg = "IP",

786

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

787

.group = 1 },

788

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

789

.arg = "INTERFACE",

790

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

791

.group = 1 },

792

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

793

.arg = "KEYDIR",

794

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

795

.group = 1 },

796

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

797

.arg = "SECKEY",

798

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

799

.group = 1 },

800

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

801

.arg = "PUBKEY",

802

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

803

.group = 2 },

804

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

805

.arg = "BITS",

806

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

807

.group = 2 },

808

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

809

.arg = "PRIORITY",

810

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

811

{ .name = NULL }

812

};

813

814

815

error_t parse_opt (int key, char *arg,

816

struct argp_state *state) {

817

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

818

a pointer to our plugin list pointer. */

819

switch (key) {

820

case 128:

821

debug = true;

716

822

break;

717

}

718

719

switch(ret){

720

case 0:

823

case 'c':

824

connect_to = arg;

721

825

break;

722

826

case 'i':

723

interface = optarg;

724

break;

725

case 'c':

726

connect_to = optarg;

827

interface = arg;

727

828

break;

728

829

case 'd':

729

keydir = optarg;

830

keydir = arg;

831

break;

832

case 's':

833

seckeyname = arg;

730

834

break;

731

835

case 'p':

732

pubkeyfile = optarg;

733

break;

734

case 's':

735

seckeyfile = optarg;

736

break;

737

case 'D':

836

pubkeyname = arg;

837

break;

838

case 129:

738

839

errno = 0;

739

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

840

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

740

841

if (errno){

741

842

perror("strtol");

742

843

exit(EXIT_FAILURE);

743

844

}

744

845

break;

745

case 'P':

746

mc.priority = optarg;

747

break;

748

case '?':

846

case 130:

847

mc.priority = arg;

848

break;

849

case ARGP_KEY_ARG:

850

argp_usage (state);

851

case ARGP_KEY_END:

852

break;

749

853

default:

750

/* getopt_long() has already printed a message about the

751

unrcognized option, so just exit. */

752

exit(EXIT_FAILURE);

753

}

754

}

755

/* Set the global debug flag from the temporary int */

756

debug = debug_int ? true : false;

757

}

758

759

pubkeyfile = combinepath(keydir, pubkeyfile);

760

if (pubkeyfile == NULL){

761

perror("combinepath");

762

exitcode = EXIT_FAILURE;

763

goto end;

764

}

765

766

seckeyfile = combinepath(keydir, seckeyfile);

767

if (seckeyfile == NULL){

768

perror("combinepath");

769

goto end;

854

return ARGP_ERR_UNKNOWN;

855

}

856

return 0;

857

}

858

859

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

860

.args_doc = "",

861

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

862

" passwords from mandos server" };

863

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

864

if (ret == ARGP_ERR_UNKNOWN){

865

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

866

exitcode = EXIT_FAILURE;

867

goto end;

868

}

869

}

870

871

pubkeyfilename = combinepath(keydir, pubkeyname);

872

if (pubkeyfilename == NULL){

873

perror("combinepath");

874

exitcode = EXIT_FAILURE;

875

goto end;

876

}

877

878

seckeyfilename = combinepath(keydir, seckeyname);

879

if (seckeyfilename == NULL){

880

perror("combinepath");

881

exitcode = EXIT_FAILURE;

882

goto end;

883

}

884

885

ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);

886

if (ret == -1){

887

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

888

exitcode = EXIT_FAILURE;

889

goto end;

890

} else {

891

gnutls_initalized = true;

892

}

893

894

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

895

{

896

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

897

if(sd < 0) {

898

perror("socket");

899

exitcode = EXIT_FAILURE;

900

goto end;

901

}

902

strcpy(network.ifr_name, interface);

903

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

904

if(ret == -1){

905

perror("ioctl SIOCGIFFLAGS");

906

exitcode = EXIT_FAILURE;

907

goto end;

908

}

909

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

910

network.ifr_flags |= IFF_UP;

911

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

912

if(ret == -1){

913

perror("ioctl SIOCSIFFLAGS");

914

exitcode = EXIT_FAILURE;

915

goto end;

916

}

917

}

918

close(sd);

919

}

920

921

uid = getuid();

922

gid = getgid();

923

924

ret = setuid(uid);

925

if (ret == -1){

926

perror("setuid");

927

}

928

929

setgid(gid);

930

if (ret == -1){

931

perror("setgid");

770

932

}

771

933

772

934

if_index = (AvahiIfIndex) if_nametoindex(interface);

781

943

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

782

944

if(address == NULL){

783

945

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

784

exit(EXIT_FAILURE);

946

exitcode = EXIT_FAILURE;

947

goto end;

785

948

}

786

949

errno = 0;

787

950

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

788

951

if(errno){

789

952

perror("Bad port number");

790

exit(EXIT_FAILURE);

953

exitcode = EXIT_FAILURE;

954

goto end;

791

955

}

792

956

*address = '\0';

793

957

address = connect_to;

794

958

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

795

959

if(ret < 0){

796

exit(EXIT_FAILURE);

960

exitcode = EXIT_FAILURE;

797

961

} else {

798

exit(EXIT_SUCCESS);

799

}

800

}

801

802

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

803

{

804

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

805

if(sd < 0) {

806

perror("socket");

807

exitcode = EXIT_FAILURE;

808

goto end;

809

}

810

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

811

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

812

if(ret == -1){

813

perror("ioctl SIOCGIFFLAGS");

814

exitcode = EXIT_FAILURE;

815

goto end;

816

}

817

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

818

network.ifr_flags |= IFF_UP;

819

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

820

if(ret == -1){

821

perror("ioctl SIOCSIFFLAGS");

822

exitcode = EXIT_FAILURE;

823

goto end;

824

}

825

}

826

close(sd);

962

exitcode = EXIT_SUCCESS;

963

}

964

goto end;

827

965

}

828

966

829

967

if (not debug){

903

1041

904

1042

if (mc.simple_poll != NULL)

905

1043

avahi_simple_poll_free(mc.simple_poll);

906

free(pubkeyfile);

907

free(seckeyfile);

1044

free(pubkeyfilename);

1045

free(seckeyfilename);

1046

1047

if (gnutls_initalized){

1048

gnutls_certificate_free_credentials(mc.cred);

1049

gnutls_global_deinit ();

1050

}

908

1051

909

1052

return exitcode;

910

1053

}