/mandos/trunk : revision 148

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,

242

281

}

243

282

plaintext_length += ret;

244

283

}

245

284

246

285

if(debug){

247

286

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

248

287

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

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

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

310

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

311

seckeyfile);

351

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

352

" secret key %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);

320

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

362

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

363

fprintf(stderr, "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

static int init_gnutls_session(mandos_context *mc,

394

gnutls_session_t *session){

395

int ret;

341

396

/* GnuTLS session creation */

342

397

ret = gnutls_init(session, GNUTLS_SERVER);

343

398

if (ret != GNUTLS_E_SUCCESS){

352

407

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

353

408

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

354

409

safer_gnutls_strerror(ret));

410

gnutls_deinit (*session);

355

411

return -1;

356

412

}

357

413

}

361

417

if (ret != GNUTLS_E_SUCCESS) {

362

418

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

363

419

safer_gnutls_strerror(ret));

420

gnutls_deinit (*session);

364

421

return -1;

365

422

}

366

423

382

439

AvahiIfIndex if_index,

383

440

mandos_context *mc){

384

441

int ret, tcp_sd;

385

struct sockaddr_in6 to;

442

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

386

443

char *buffer = NULL;

387

444

char *decrypted_buffer;

388

445

size_t buffer_length = 0;

389

446

size_t buffer_capacity = 0;

390

447

ssize_t decrypted_buffer_size;

391

size_t written = 0;

448

size_t written;

392

449

int retval = 0;

393

450

char interface[IF_NAMESIZE];

394

451

gnutls_session_t session;

395

gnutls_dh_params_t dh_params;

396

452

397

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

453

ret = init_gnutls_session (mc, &session);

398

454

if (ret != 0){

399

455

return -1;

400

456

}

401

457

402

458

if(debug){

403

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

404

ip, port);

459

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

460

"\n", ip, port);

405

461

}

406

462

407

463

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

409

465

perror("socket");

410

466

return -1;

411

467

}

412

468

413

469

if(debug){

414

470

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

415

471

perror("if_indextoname");

418

474

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

419

475

}

420

476

421

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

422

to.sin6_family = AF_INET6;

477

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

478

to.in6.sin6_family = AF_INET6;

423

479

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

424

480

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

425

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

481

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

426

482

if (ret < 0 ){

427

483

perror("inet_pton");

428

484

return -1;

431

487

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

432

488

return -1;

433

489

}

434

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

490

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

435

491

436

to.sin6_scope_id = (uint32_t)if_index;

492

to.in6.sin6_scope_id = (uint32_t)if_index;

437

493

438

494

if(debug){

439

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

495

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

496

port);

440

497

char addrstr[INET6_ADDRSTRLEN] = "";

441

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

498

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

442

499

sizeof(addrstr)) == NULL){

443

500

perror("inet_ntop");

444

501

} else {

448

505

}

449

506

}

450

507

451

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

508

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

452

509

if (ret < 0){

453

510

perror("connect");

454

511

return -1;

455

512

}

456

513

514

const char *out = mandos_protocol_version;

515

written = 0;

516

while (true){

517

size_t out_size = strlen(out);

518

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

519

out_size - written));

520

if (ret == -1){

521

perror("write");

522

retval = -1;

523

goto mandos_end;

524

}

525

written += (size_t)ret;

526

if(written < out_size){

527

continue;

528

} else {

529

if (out == mandos_protocol_version){

530

written = 0;

531

out = "\r\n";

532

} else {

533

break;

534

}

535

}

536

}

537

457

538

if(debug){

458

539

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

459

540

}

460

541

461

542

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

462

543

463

ret = gnutls_handshake (session);

544

do{

545

ret = gnutls_handshake (session);

546

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

464

547

465

548

if (ret != GNUTLS_E_SUCCESS){

466

549

if(debug){

477

560

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

478

561

ip);

479

562

}

480

563

481

564

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;

565

buffer_capacity = adjustbuffer(&buffer, buffer_length,

566

buffer_capacity);

567

if (buffer_capacity == 0){

568

perror("adjustbuffer");

569

retval = -1;

570

goto mandos_end;

490

571

}

491

572

492

573

ret = gnutls_record_recv(session, buffer+buffer_length,

500

581

case GNUTLS_E_AGAIN:

501

582

break;

502

583

case GNUTLS_E_REHANDSHAKE:

503

ret = gnutls_handshake (session);

584

do{

585

ret = gnutls_handshake (session);

586

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

504

587

if (ret < 0){

505

588

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

506

589

gnutls_perror (ret);

532

615

&decrypted_buffer,

533

616

keydir);

534

617

if (decrypted_buffer_size >= 0){

618

written = 0;

535

619

while(written < (size_t) decrypted_buffer_size){

536

620

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

537

621

(size_t)decrypted_buffer_size - written,

550

634

} else {

551

635

retval = -1;

552

636

}

637

} else {

638

retval = -1;

553

639

}

554

640

555

641

/* Shutdown procedure */

558

644

free(buffer);

559

645

close(tcp_sd);

560

646

gnutls_deinit (session);

561

gnutls_certificate_free_credentials (mc->cred);

562

gnutls_global_deinit ();

563

647

return retval;

564

648

}

565

649

578

662

flags,

579

663

void* userdata) {

580

664

mandos_context *mc = userdata;

581

assert(r); /* Spurious warning */

665

assert(r);

582

666

583

667

/* Called whenever a service has been resolved successfully or

584

668

timed out */

596

680

char ip[AVAHI_ADDRESS_STR_MAX];

597

681

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

598

682

if(debug){

599

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

600

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

683

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

684

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

685

interface, port);

601

686

}

602

687

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

603

688

if (ret == 0){

604

exit(EXIT_SUCCESS);

689

avahi_simple_poll_quit(mc->simple_poll);

605

690

}

606

691

}

607

692

}

619

704

flags,

620

705

void* userdata) {

621

706

mandos_context *mc = userdata;

622

assert(b); /* Spurious warning */

707

assert(b);

623

708

624

709

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

625

710

is removed from the LAN */

661

746

662

747

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

663

748

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){

749

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

750

char *tmp;

751

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

752

if(ret < 0){

669

753

return NULL;

670

754

}

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

755

return tmp;

680

756

}

681

757

688

764

const char *interface = "eth0";

689

765

struct ifreq network;

690

766

int sd;

767

uid_t uid;

768

gid_t gid;

691

769

char *connect_to = NULL;

692

770

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

771

char *pubkeyfilename = NULL;

772

char *seckeyfilename = NULL;

773

const char *pubkeyname = "pubkey.txt";

774

const char *seckeyname = "seckey.txt";

693

775

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

694

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

776

.dh_bits = 1024, .priority = "SECURE256"

777

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

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){

716

break;

717

}

718

719

switch(ret){

720

case 0:

721

break;

722

case 'i':

723

interface = optarg;

724

break;

725

case 'c':

726

connect_to = optarg;

727

break;

728

case 'd':

729

keydir = optarg;

730

break;

731

case 'p':

732

pubkeyfile = optarg;

733

break;

734

case 's':

735

seckeyfile = optarg;

736

break;

737

case 'D':

781

struct argp_option options[] = {

782

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

783

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

784

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

785

.arg = "ADDRESS:PORT",

786

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

787

.group = 1 },

788

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

789

.arg = "NAME",

790

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

791

" servers",

792

.group = 1 },

793

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

794

.arg = "DIRECTORY",

795

.doc = "Directory to read the OpenPGP key files from",

796

.group = 1 },

797

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

798

.arg = "FILE",

799

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

800

.group = 1 },

801

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

802

.arg = "FILE",

803

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

804

.group = 2 },

805

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

806

.arg = "BITS",

807

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

808

" Diffie-Hellman key exchange",

809

.group = 2 },

810

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

811

.arg = "STRING",

812

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

813

.group = 1 },

814

{ .name = NULL }

815

};

816

817

error_t parse_opt (int key, char *arg,

818

struct argp_state *state) {

819

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

820

a pointer to our plugin list pointer. */

821

switch (key) {

822

case 128: /* --debug */

823

debug = true;

824

break;

825

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

826

connect_to = arg;

827

break;

828

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

829

interface = arg;

830

break;

831

case 'd': /* --keydir */

832

keydir = arg;

833

break;

834

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

835

seckeyname = arg;

836

break;

837

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

838

pubkeyname = arg;

839

break;

840

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

738

841

errno = 0;

739

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

842

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

740

843

if (errno){

741

844

perror("strtol");

742

845

exit(EXIT_FAILURE);

743

846

}

744

847

break;

745

case 'P':

746

mc.priority = optarg;

747

break;

748

case '?':

848

case 130: /* --priority */

849

mc.priority = arg;

850

break;

851

case ARGP_KEY_ARG:

852

argp_usage (state);

853

case ARGP_KEY_END:

854

break;

749

855

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;

856

return ARGP_ERR_UNKNOWN;

857

}

858

return 0;

859

}

860

861

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

862

.args_doc = "",

863

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

864

" passwords from a Mandos server" };

865

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

866

if (ret == ARGP_ERR_UNKNOWN){

867

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

868

exitcode = EXIT_FAILURE;

869

goto end;

870

}

871

}

872

873

pubkeyfilename = combinepath(keydir, pubkeyname);

874

if (pubkeyfilename == NULL){

875

perror("combinepath");

876

exitcode = EXIT_FAILURE;

877

goto end;

878

}

879

880

seckeyfilename = combinepath(keydir, seckeyname);

881

if (seckeyfilename == NULL){

882

perror("combinepath");

883

exitcode = EXIT_FAILURE;

884

goto end;

885

}

886

887

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

888

if (ret == -1){

889

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

890

exitcode = EXIT_FAILURE;

891

goto end;

892

} else {

893

gnutls_initalized = true;

894

}

895

896

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

897

{

898

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

899

if(sd < 0) {

900

perror("socket");

901

exitcode = EXIT_FAILURE;

902

goto end;

903

}

904

strcpy(network.ifr_name, interface);

905

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

906

if(ret == -1){

907

perror("ioctl SIOCGIFFLAGS");

908

exitcode = EXIT_FAILURE;

909

goto end;

910

}

911

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

912

network.ifr_flags |= IFF_UP;

913

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

914

if(ret == -1){

915

perror("ioctl SIOCSIFFLAGS");

916

exitcode = EXIT_FAILURE;

917

goto end;

918

}

919

}

920

close(sd);

921

}

922

923

uid = getuid();

924

gid = getgid();

925

926

ret = setuid(uid);

927

if (ret == -1){

928

perror("setuid");

929

}

930

931

setgid(gid);

932

if (ret == -1){

933

perror("setgid");

770

934

}

771

935

772

936

if_index = (AvahiIfIndex) if_nametoindex(interface);

781

945

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

782

946

if(address == NULL){

783

947

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

784

exit(EXIT_FAILURE);

948

exitcode = EXIT_FAILURE;

949

goto end;

785

950

}

786

951

errno = 0;

787

952

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

788

953

if(errno){

789

954

perror("Bad port number");

790

exit(EXIT_FAILURE);

955

exitcode = EXIT_FAILURE;

956

goto end;

791

957

}

792

958

*address = '\0';

793

959

address = connect_to;

794

960

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

795

961

if(ret < 0){

796

exit(EXIT_FAILURE);

962

exitcode = EXIT_FAILURE;

797

963

} 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);

964

exitcode = EXIT_SUCCESS;

965

}

966

goto end;

827

967

}

828

968

829

969

if (not debug){

841

981

exitcode = EXIT_FAILURE;

842

982

goto end;

843

983

}

844

984

845

985

{

846

986

AvahiServerConfig config;

847

987

/* Do not publish any local Zeroconf records */

850

990

config.publish_addresses = 0;

851

991

config.publish_workstation = 0;

852

992

config.publish_domain = 0;

853

993

854

994

/* Allocate a new server */

855

995

mc.server = avahi_server_new(avahi_simple_poll_get

856

996

(mc.simple_poll), &config, NULL,

857

997

NULL, &error);

858

998

859

999

/* Free the Avahi configuration data */

860

1000

avahi_server_config_free(&config);

861

1001

}

881

1021

}

882

1022

883

1023

/* Run the main loop */

884

1024

885

1025

if (debug){

886

1026

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

887

1027

}

889

1029

avahi_simple_poll_loop(mc.simple_poll);

890

1030

891

1031

end:

892

1032

893

1033

if (debug){

894

1034

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

895

1035

}

900

1040

901

1041

if (mc.server != NULL)

902

1042

avahi_server_free(mc.server);

903

1043

904

1044

if (mc.simple_poll != NULL)

905

1045

avahi_simple_poll_free(mc.simple_poll);

906

free(pubkeyfile);

907

free(seckeyfile);

1046

free(pubkeyfilename);

1047

free(seckeyfilename);

1048

1049

if (gnutls_initalized){

1050

gnutls_certificate_free_credentials(mc.cred);

1051

gnutls_global_deinit ();

1052

}

908

1053

909

1054

return exitcode;

910

1055

}