/mandos/release : revision 95

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

186

229

} else {

187

230

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

188

231

result->unsupported_algorithm);

189

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

232

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

190

233

result->wrong_key_usage);

191

234

if(result->file_name != NULL){

192

235

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

216

259

217

260

*plaintext = NULL;

218

261

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");

262

plaintext_capacity = adjustbuffer(plaintext,

263

(size_t)plaintext_length,

264

plaintext_capacity);

265

if (plaintext_capacity == 0){

266

perror("adjustbuffer");

225

267

plaintext_length = -1;

226

268

goto decrypt_end;

227

}

228

plaintext_capacity += BUFFER_SIZE;

229

269

}

230

270

231

271

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

262

302

}

263

303

264

304

static const char * safer_gnutls_strerror (int value) {

265

const char *ret = gnutls_strerror (value);

305

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

266

306

if (ret == NULL)

267

307

ret = "(unknown)";

268

308

return ret;

274

314

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

275

315

}

276

316

277

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

278

gnutls_dh_params_t *dh_params){

317

static int init_gnutls_global(mandos_context *mc,

318

const char *pubkeyfilename,

319

const char *seckeyfilename){

279

320

int ret;

280

321

281

322

if(debug){

282

323

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

283

324

}

284

285

if ((ret = gnutls_global_init ())

286

!= GNUTLS_E_SUCCESS) {

325

326

ret = gnutls_global_init();

327

if (ret != GNUTLS_E_SUCCESS) {

287

328

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

288

329

safer_gnutls_strerror(ret));

289

330

return -1;

298

339

}

299

340

300

341

/* OpenPGP credentials */

301

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

302

!= GNUTLS_E_SUCCESS) {

303

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

342

gnutls_certificate_allocate_credentials(&mc->cred);

343

if (ret != GNUTLS_E_SUCCESS){

344

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

345

warning */

304

346

safer_gnutls_strerror(ret));

347

gnutls_global_deinit ();

305

348

return -1;

306

349

}

307

350

308

351

if(debug){

309

352

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

310

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

311

seckeyfile);

353

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

354

seckeyfilename);

312

355

}

313

356

314

357

ret = gnutls_certificate_set_openpgp_key_file

315

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

358

(mc->cred, pubkeyfilename, seckeyfilename,

359

GNUTLS_OPENPGP_FMT_BASE64);

316

360

if (ret != GNUTLS_E_SUCCESS) {

317

361

fprintf(stderr,

318

362

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

319

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

363

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

320

364

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

321

365

safer_gnutls_strerror(ret));

322

return -1;

366

goto globalfail;

323

367

}

324

368

325

369

/* GnuTLS server initialization */

326

ret = gnutls_dh_params_init(dh_params);

370

ret = gnutls_dh_params_init(&mc->dh_params);

327

371

if (ret != GNUTLS_E_SUCCESS) {

328

372

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

329

373

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

330

return -1;

374

goto globalfail;

331

375

}

332

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

376

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

333

377

if (ret != GNUTLS_E_SUCCESS) {

334

378

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

335

379

safer_gnutls_strerror(ret));

336

return -1;

380

goto globalfail;

337

381

}

338

382

339

gnutls_certificate_set_dh_params(mc->cred, *dh_params);

340

383

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

384

385

return 0;

386

387

globalfail:

388

389

gnutls_certificate_free_credentials(mc->cred);

390

gnutls_global_deinit();

391

return -1;

392

393

}

394

395

static int init_gnutls_session(mandos_context *mc,

396

gnutls_session_t *session){

397

int ret;

341

398

/* GnuTLS session creation */

342

399

ret = gnutls_init(session, GNUTLS_SERVER);

343

400

if (ret != GNUTLS_E_SUCCESS){

352

409

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

353

410

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

354

411

safer_gnutls_strerror(ret));

412

gnutls_deinit (*session);

355

413

return -1;

356

414

}

357

415

}

361

419

if (ret != GNUTLS_E_SUCCESS) {

362

420

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

363

421

safer_gnutls_strerror(ret));

422

gnutls_deinit (*session);

364

423

return -1;

365

424

}

366

425

382

441

AvahiIfIndex if_index,

383

442

mandos_context *mc){

384

443

int ret, tcp_sd;

385

struct sockaddr_in6 to;

444

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

386

445

char *buffer = NULL;

387

446

char *decrypted_buffer;

388

447

size_t buffer_length = 0;

389

448

size_t buffer_capacity = 0;

390

449

ssize_t decrypted_buffer_size;

391

size_t written = 0;

450

size_t written;

392

451

int retval = 0;

393

452

char interface[IF_NAMESIZE];

394

453

gnutls_session_t session;

395

gnutls_dh_params_t dh_params;

396

454

397

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

455

ret = init_gnutls_session (mc, &session);

398

456

if (ret != 0){

399

457

return -1;

400

458

}

401

459

402

460

if(debug){

403

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

404

ip, port);

461

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

462

"\n", ip, port);

405

463

}

406

464

407

465

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

418

476

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

419

477

}

420

478

421

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

422

to.sin6_family = AF_INET6;

479

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

480

to.in6.sin6_family = AF_INET6;

423

481

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

424

482

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

425

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

483

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

426

484

if (ret < 0 ){

427

485

perror("inet_pton");

428

486

return -1;

431

489

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

432

490

return -1;

433

491

}

434

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

492

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

435

493

436

to.sin6_scope_id = (uint32_t)if_index;

494

to.in6.sin6_scope_id = (uint32_t)if_index;

437

495

438

496

if(debug){

439

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

497

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

498

port);

440

499

char addrstr[INET6_ADDRSTRLEN] = "";

441

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

500

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

442

501

sizeof(addrstr)) == NULL){

443

502

perror("inet_ntop");

444

503

} else {

448

507

}

449

508

}

450

509

451

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

510

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

452

511

if (ret < 0){

453

512

perror("connect");

454

513

return -1;

455

514

}

456

515

516

const char *out = mandos_protocol_version;

517

written = 0;

518

while (true){

519

size_t out_size = strlen(out);

520

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

521

out_size - written));

522

if (ret == -1){

523

perror("write");

524

retval = -1;

525

goto mandos_end;

526

}

527

written += (size_t)ret;

528

if(written < out_size){

529

continue;

530

} else {

531

if (out == mandos_protocol_version){

532

written = 0;

533

out = "\r\n";

534

} else {

535

break;

536

}

537

}

538

}

539

457

540

if(debug){

458

541

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

459

542

}

460

543

461

544

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

462

463

ret = gnutls_handshake (session);

545

546

do{

547

ret = gnutls_handshake (session);

548

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

464

549

465

550

if (ret != GNUTLS_E_SUCCESS){

466

551

if(debug){

479

564

}

480

565

481

566

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;

567

buffer_capacity = adjustbuffer(&buffer, buffer_length,

568

buffer_capacity);

569

if (buffer_capacity == 0){

570

perror("adjustbuffer");

571

retval = -1;

572

goto mandos_end;

490

573

}

491

574

492

575

ret = gnutls_record_recv(session, buffer+buffer_length,

500

583

case GNUTLS_E_AGAIN:

501

584

break;

502

585

case GNUTLS_E_REHANDSHAKE:

503

ret = gnutls_handshake (session);

586

do{

587

ret = gnutls_handshake (session);

588

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

504

589

if (ret < 0){

505

590

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

506

591

gnutls_perror (ret);

532

617

&decrypted_buffer,

533

618

keydir);

534

619

if (decrypted_buffer_size >= 0){

620

written = 0;

535

621

while(written < (size_t) decrypted_buffer_size){

536

622

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

537

623

(size_t)decrypted_buffer_size - written,

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

776

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

777

bool gnutls_initalized = false;

695

778

696

779

{

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){

780

struct argp_option options[] = {

781

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

782

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

783

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

784

.arg = "IP",

785

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

786

.group = 1 },

787

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

788

.arg = "INTERFACE",

789

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

790

.group = 1 },

791

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

792

.arg = "KEYDIR",

793

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

794

.group = 1 },

795

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

796

.arg = "SECKEY",

797

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

798

.group = 1 },

799

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

800

.arg = "PUBKEY",

801

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

802

.group = 2 },

803

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

804

.arg = "BITS",

805

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

806

.group = 2 },

807

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

808

.arg = "PRIORITY",

809

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

810

{ .name = NULL }

811

};

812

813

814

error_t parse_opt (int key, char *arg,

815

struct argp_state *state) {

816

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

817

a pointer to our plugin list pointer. */

818

switch (key) {

819

case 128:

820

debug = true;

716

821

break;

717

}

718

719

switch(ret){

720

case 0:

822

case 'c':

823

connect_to = arg;

721

824

break;

722

825

case 'i':

723

interface = optarg;

724

break;

725

case 'c':

726

connect_to = optarg;

826

interface = arg;

727

827

break;

728

828

case 'd':

729

keydir = optarg;

829

keydir = arg;

830

break;

831

case 's':

832

seckeyname = arg;

730

833

break;

731

834

case 'p':

732

pubkeyfile = optarg;

733

break;

734

case 's':

735

seckeyfile = optarg;

736

break;

737

case 'D':

835

pubkeyname = arg;

836

break;

837

case 129:

738

838

errno = 0;

739

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

839

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

740

840

if (errno){

741

841

perror("strtol");

742

842

exit(EXIT_FAILURE);

743

843

}

744

844

break;

745

case 'P':

746

mc.priority = optarg;

747

break;

748

case '?':

845

case 130:

846

mc.priority = arg;

847

break;

848

case ARGP_KEY_ARG:

849

argp_usage (state);

850

case ARGP_KEY_END:

851

break;

749

852

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;

853

return ARGP_ERR_UNKNOWN;

854

}

855

return 0;

856

}

857

858

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

859

.args_doc = "",

860

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

861

" passwords from mandos server" };

862

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

863

if (ret == ARGP_ERR_UNKNOWN){

864

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

865

exitcode = EXIT_FAILURE;

866

goto end;

867

}

868

}

869

870

pubkeyfilename = combinepath(keydir, pubkeyname);

871

if (pubkeyfilename == NULL){

872

perror("combinepath");

873

exitcode = EXIT_FAILURE;

874

goto end;

875

}

876

877

seckeyfilename = combinepath(keydir, seckeyname);

878

if (seckeyfilename == NULL){

879

perror("combinepath");

880

exitcode = EXIT_FAILURE;

881

goto end;

882

}

883

884

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

885

if (ret == -1){

886

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

887

exitcode = EXIT_FAILURE;

888

goto end;

889

} else {

890

gnutls_initalized = true;

891

}

892

893

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

894

{

895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

896

if(sd < 0) {

897

perror("socket");

898

exitcode = EXIT_FAILURE;

899

goto end;

900

}

901

strcpy(network.ifr_name, interface);

902

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

903

if(ret == -1){

904

perror("ioctl SIOCGIFFLAGS");

905

exitcode = EXIT_FAILURE;

906

goto end;

907

}

908

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

909

network.ifr_flags |= IFF_UP;

910

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

911

if(ret == -1){

912

perror("ioctl SIOCSIFFLAGS");

913

exitcode = EXIT_FAILURE;

914

goto end;

915

}

916

}

917

close(sd);

918

}

919

920

uid = getuid();

921

gid = getgid();

922

923

ret = setuid(uid);

924

if (ret == -1){

925

perror("setuid");

926

}

927

928

setgid(gid);

929

if (ret == -1){

930

perror("setgid");

770

931

}

771

932

772

933

if_index = (AvahiIfIndex) if_nametoindex(interface);

781

942

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

782

943

if(address == NULL){

783

944

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

784

exit(EXIT_FAILURE);

945

exitcode = EXIT_FAILURE;

946

goto end;

785

947

}

786

948

errno = 0;

787

949

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

788

950

if(errno){

789

951

perror("Bad port number");

790

exit(EXIT_FAILURE);

952

exitcode = EXIT_FAILURE;

953

goto end;

791

954

}

792

955

*address = '\0';

793

956

address = connect_to;

794

957

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

795

958

if(ret < 0){

796

exit(EXIT_FAILURE);

959

exitcode = EXIT_FAILURE;

797

960

} 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);

961

exitcode = EXIT_SUCCESS;

962

}

963

goto end;

827

964

}

828

965

829

966

if (not debug){

903

1040

904

1041

if (mc.simple_poll != NULL)

905

1042

avahi_simple_poll_free(mc.simple_poll);

906

free(pubkeyfile);

907

free(seckeyfile);

1043

free(pubkeyfilename);

1044

free(seckeyfilename);

1045

1046

if (gnutls_initalized){

1047

gnutls_certificate_free_credentials(mc.cred);

1048

gnutls_global_deinit ();

1049

}

908

1050

909

1051

return exitcode;

910

1052

}