/mandos/release : revision 237.2.59

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

41

37

42

38

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

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

45

42

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

46

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

47

strtof(), abort() */

48

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

43

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

44

srand() */

45

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

49

46

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

50

47

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

51

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

48

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

52

49

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

53

50

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

uid_t, gid_t, open(), opendir(),

53

DIR */

56

54

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

57

55

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

58

inet_pton(), connect() */

56

struct in6_addr, inet_pton(),

57

connect() */

59

58

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

60

59

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

61

60

*/

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

61

#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */

64

62

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

65

63

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

66

64

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

67

65

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

68

66

SIOCSIFFLAGS, if_indextoname(),

69

67

if_nametoindex(), IF_NAMESIZE */

70

#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

68

#include <netinet/in.h>

73

69

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

74

getuid(), getgid(), seteuid(),

75

setgid(), pause() */

70

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

71

setgid() */

76

72

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

77

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

73

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

78

74

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

79

75

argp_state, struct argp,

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

88

78

#ifdef __linux__

89

79

#include <sys/klog.h> /* klogctl() */

90

#endif /* __linux__ */

80

#endif

91

81

92

82

/* Avahi */

93

83

/* All Avahi types, constants and functions

127

117

static const char mandos_protocol_version[] = "1";

128

118

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

129

119

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

130

static const char sys_class_net[] = "/sys/class/net";

131

char *connect_to = NULL;

132

120

133

121

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

134

122

typedef struct {

141

129

gpgme_ctx_t ctx;

142

130

} mandos_context;

143

131

144

/* global context so signal handler can reach it*/

145

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

146

.dh_bits = 1024, .priority = "SECURE256"

147

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

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

132

/*

153

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

* bytes. "buffer_capacity" is how much is currently allocated,

133

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

134

* "buffer_capacity" is how much is currently allocated,

155

135

* "buffer_length" is how much is already used.

156

136

*/

157

size_t incbuffer(char **buffer, size_t buffer_length,

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

158

138

size_t buffer_capacity){

159

139

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

140

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

169

149

/*

170

150

* Initialize GPGME.

171

151

*/

172

static bool init_gpgme(const char *seckey,

152

static bool init_gpgme(mandos_context *mc, const char *seckey,

173

153

const char *pubkey, const char *tempdir){

154

int ret;

174

155

gpgme_error_t rc;

175

156

gpgme_engine_info_t engine_info;

176

157

179

160

* Helper function to insert pub and seckey to the engine keyring.

180

161

*/

181

162

bool import_key(const char *filename){

182

int ret;

183

163

int fd;

184

164

gpgme_data_t pgp_data;

185

165

196

176

return false;

197

177

}

198

178

199

rc = gpgme_op_import(mc.ctx, pgp_data);

179

rc = gpgme_op_import(mc->ctx, pgp_data);

200

180

if(rc != GPG_ERR_NO_ERROR){

201

181

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

202

182

gpgme_strsource(rc), gpgme_strerror(rc));

212

192

}

213

193

214

194

if(debug){

215

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

195

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

216

196

}

217

197

218

198

/* Init GPGME */

245

225

}

246

226

247

227

/* Create new GPGME "context" */

248

rc = gpgme_new(&(mc.ctx));

228

rc = gpgme_new(&(mc->ctx));

249

229

if(rc != GPG_ERR_NO_ERROR){

250

230

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

251

231

gpgme_strsource(rc), gpgme_strerror(rc));

256

236

return false;

257

237

}

258

238

259

return true;

239

return true;

260

240

}

261

241

262

242

/*

263

243

* Decrypt OpenPGP data.

264

244

* Returns -1 on error

265

245

*/

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

267

248

size_t crypto_size,

268

249

char **plaintext){

269

250

gpgme_data_t dh_crypto, dh_plain;

296

277

297

278

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

298

279

data buffer */

299

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

280

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

300

281

if(rc != GPG_ERR_NO_ERROR){

301

282

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

302

283

gpgme_strsource(rc), gpgme_strerror(rc));

303

284

plaintext_length = -1;

304

285

if(debug){

305

286

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

307

288

if(result == NULL){

308

289

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

309

290

} else {

316

297

}

317

298

gpgme_recipient_t recipient;

318

299

recipient = result->recipients;

319

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

300

if(recipient){

301

while(recipient != NULL){

302

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

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

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

305

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

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

327

310

}

328

311

}

329

312

}

343

326

344

327

*plaintext = NULL;

345

328

while(true){

346

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

347

330

(size_t)plaintext_length,

348

331

plaintext_capacity);

349

332

if(plaintext_capacity == 0){

350

perror("incbuffer");

333

perror("adjustbuffer");

351

334

plaintext_length = -1;

352

335

goto decrypt_end;

353

336

}

399

382

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

400

383

}

401

384

402

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

403

387

const char *seckeyfilename){

404

388

int ret;

405

389

423

407

}

424

408

425

409

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

427

411

if(ret != GNUTLS_E_SUCCESS){

428

412

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

429

from

430

-Wunreachable-code

431

*/

413

* from

414

* -Wunreachable-code

415

*/

432

416

safer_gnutls_strerror(ret));

433

417

gnutls_global_deinit();

434

418

return -1;

441

425

}

442

426

443

427

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

445

429

GNUTLS_OPENPGP_FMT_BASE64);

446

430

if(ret != GNUTLS_E_SUCCESS){

447

431

fprintf(stderr,

453

437

}

454

438

455

439

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

457

441

if(ret != GNUTLS_E_SUCCESS){

458

442

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

459

443

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

460

444

goto globalfail;

461

445

}

462

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

446

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

463

447

if(ret != GNUTLS_E_SUCCESS){

464

448

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

465

449

safer_gnutls_strerror(ret));

466

450

goto globalfail;

467

451

}

468

452

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

470

454

471

455

return 0;

472

456

473

457

globalfail:

474

458

475

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

476

460

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

478

462

return -1;

479

463

}

480

464

481

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

482

467

int ret;

483

468

/* GnuTLS session creation */

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

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

469

ret = gnutls_init(session, GNUTLS_SERVER);

490

470

if(ret != GNUTLS_E_SUCCESS){

491

471

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

492

472

safer_gnutls_strerror(ret));

494

474

495

475

{

496

476

const char *err;

497

do {

498

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

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

477

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

504

478

if(ret != GNUTLS_E_SUCCESS){

505

479

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

506

480

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

510

484

}

511

485

}

512

486

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

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

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

521

489

if(ret != GNUTLS_E_SUCCESS){

522

490

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

523

491

safer_gnutls_strerror(ret));

526

494

}

527

495

528

496

/* ignore client certificate if any. */

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

530

499

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

532

501

533

502

return 0;

534

503

}

540

509

/* Called when a Mandos server is found */

541

510

static int start_mandos_communication(const char *ip, uint16_t port,

542

511

AvahiIfIndex if_index,

543

int af){

544

int ret, tcp_sd = -1;

512

mandos_context *mc){

513

int ret, tcp_sd;

545

514

ssize_t sret;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

515

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

550

516

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

517

char *decrypted_buffer;

552

518

size_t buffer_length = 0;

553

519

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

554

521

size_t written;

555

int retval = -1;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

556

524

gnutls_session_t session;

557

int pf; /* Protocol family */

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

566

switch(af){

567

case AF_INET6:

568

pf = PF_INET6;

569

break;

570

case AF_INET:

571

pf = PF_INET;

572

break;

573

default:

574

fprintf(stderr, "Bad address family: %d\n", af);

575

errno = EINVAL;

576

return -1;

577

}

578

579

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

580

527

if(ret != 0){

581

528

return -1;

582

529

}

583

530

584

531

if(debug){

585

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

532

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

586

533

"\n", ip, port);

587

534

}

588

535

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

590

537

if(tcp_sd < 0){

591

int e = errno;

592

538

perror("socket");

593

errno = e;

594

goto mandos_end;

539

return -1;

595

540

}

596

541

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

542

if(debug){

543

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

544

perror("if_indextoname");

545

return -1;

546

}

547

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

600

548

}

601

549

602

550

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

603

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

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

606

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

ret = inet_pton(af, ip, &to.in.sin_addr);

609

}

551

to.in6.sin6_family = AF_INET6;

552

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

553

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

554

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

610

555

if(ret < 0 ){

611

int e = errno;

612

556

perror("inet_pton");

613

errno = e;

614

goto mandos_end;

557

return -1;

615

558

}

616

559

if(ret == 0){

617

int e = errno;

618

560

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

619

errno = e;

620

goto mandos_end;

561

return -1;

621

562

}

622

if(af == AF_INET6){

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

629

-Wunreachable-code*/

630

if(if_index == AVAHI_IF_UNSPEC){

631

fprintf(stderr, "An IPv6 link-local address is incomplete"

632

" without a network interface\n");

633

errno = EINVAL;

634

goto mandos_end;

635

}

636

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

638

}

639

} else {

640

to.in.sin_port = htons(port); /* Spurious warnings from

563

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

641

564

-Wconversion and

642

565

-Wunreachable-code */

643

}

644

566

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

567

to.in6.sin6_scope_id = (uint32_t)if_index;

649

568

650

569

if(debug){

651

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

char interface[IF_NAMESIZE];

653

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

654

perror("if_indextoname");

655

} else {

656

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

657

ip, interface, port);

658

}

659

} else {

660

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

661

port);

662

}

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

if(af == AF_INET6){

667

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

668

sizeof(addrstr));

669

} else {

670

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

570

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

571

port);

572

char addrstr[INET6_ADDRSTRLEN] = "";

573

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

574

sizeof(addrstr)) == NULL){

674

575

perror("inet_ntop");

675

576

} else {

676

577

if(strcmp(addrstr, ip) != 0){

679

580

}

680

581

}

681

582

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

ret = connect(tcp_sd, &to.in6, sizeof(to));

689

} else {

690

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

691

}

583

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

692

584

if(ret < 0){

693

int e = errno;

694

585

perror("connect");

695

errno = e;

696

goto mandos_end;

697

}

698

699

if(quit_now){

700

errno = EINTR;

701

goto mandos_end;

586

return -1;

702

587

}

703

588

704

589

const char *out = mandos_protocol_version;

708

593

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

709

594

out_size - written));

710

595

if(ret == -1){

711

int e = errno;

712

596

perror("write");

713

errno = e;

597

retval = -1;

714

598

goto mandos_end;

715

599

}

716

600

written += (size_t)ret;

724

608

break;

725

609

}

726

610

}

727

728

if(quit_now){

729

errno = EINTR;

730

goto mandos_end;

731

}

732

611

}

733

612

734

613

if(debug){

735

614

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

736

615

}

737

616

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

743

617

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

744

618

745

if(quit_now){

746

errno = EINTR;

747

goto mandos_end;

748

}

749

750

do {

619

do{

751

620

ret = gnutls_handshake(session);

752

if(quit_now){

753

errno = EINTR;

754

goto mandos_end;

755

}

756

621

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

757

622

758

623

if(ret != GNUTLS_E_SUCCESS){

760

625

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

761

626

gnutls_perror(ret);

762

627

}

763

errno = EPROTO;

628

retval = -1;

764

629

goto mandos_end;

765

630

}

766

631

767

632

/* Read OpenPGP packet that contains the wanted password */

768

633

769

634

if(debug){

770

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

635

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

771

636

ip);

772

637

}

773

638

774

639

while(true){

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

779

}

780

781

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

782

641

buffer_capacity);

783

642

if(buffer_capacity == 0){

784

int e = errno;

785

perror("incbuffer");

786

errno = e;

787

goto mandos_end;

788

}

789

790

if(quit_now){

791

errno = EINTR;

643

perror("adjustbuffer");

644

retval = -1;

792

645

goto mandos_end;

793

646

}

794

647

803

656

case GNUTLS_E_AGAIN:

804

657

break;

805

658

case GNUTLS_E_REHANDSHAKE:

806

do {

659

do{

807

660

ret = gnutls_handshake(session);

808

809

if(quit_now){

810

errno = EINTR;

811

goto mandos_end;

812

}

813

661

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

814

662

if(ret < 0){

815

663

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

816

664

gnutls_perror(ret);

817

errno = EPROTO;

665

retval = -1;

818

666

goto mandos_end;

819

667

}

820

668

break;

821

669

default:

822

670

fprintf(stderr, "Unknown error while reading data from"

823

671

" encrypted session with Mandos server\n");

672

retval = -1;

824

673

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

826

674

goto mandos_end;

827

675

}

828

676

} else {

834

682

fprintf(stderr, "Closing TLS session\n");

835

683

}

836

684

837

if(quit_now){

838

errno = EINTR;

839

goto mandos_end;

840

}

841

842

do {

843

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

844

if(quit_now){

845

errno = EINTR;

846

goto mandos_end;

847

}

848

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

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

849

686

850

687

if(buffer_length > 0){

851

ssize_t decrypted_buffer_size;

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

853

689

buffer_length,

854

690

&decrypted_buffer);

855

691

if(decrypted_buffer_size >= 0){

856

857

692

written = 0;

858

693

while(written < (size_t) decrypted_buffer_size){

859

if(quit_now){

860

errno = EINTR;

861

goto mandos_end;

862

}

863

864

694

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

865

695

(size_t)decrypted_buffer_size - written,

866

696

stdout);

867

697

if(ret == 0 and ferror(stdout)){

868

int e = errno;

869

698

if(debug){

870

699

fprintf(stderr, "Error writing encrypted data: %s\n",

871

700

strerror(errno));

872

701

}

873

errno = e;

874

goto mandos_end;

702

retval = -1;

703

break;

875

704

}

876

705

written += (size_t)ret;

877

706

}

878

retval = 0;

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

879

710

}

711

} else {

712

retval = -1;

880

713

}

881

714

882

715

/* Shutdown procedure */

883

716

884

717

mandos_end:

885

{

886

int e = errno;

887

free(decrypted_buffer);

888

free(buffer);

889

if(tcp_sd >= 0){

890

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

891

}

892

if(ret == -1){

893

if(e == 0){

894

e = errno;

895

}

896

perror("close");

897

}

898

gnutls_deinit(session);

899

if(quit_now){

900

e = EINTR;

901

retval = -1;

902

}

903

errno = e;

718

free(buffer);

719

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

720

if(ret == -1){

721

perror("close");

904

722

}

723

gnutls_deinit(session);

905

724

return retval;

906

725

}

907

726

908

727

static void resolve_callback(AvahiSServiceResolver *r,

909

728

AvahiIfIndex interface,

910

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

911

730

AvahiResolverEvent event,

912

731

const char *name,

913

732

const char *type,

918

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

919

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

920

739

flags,

921

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

922

742

assert(r);

923

743

924

744

/* Called whenever a service has been resolved successfully or

925

745

timed out */

926

746

927

if(quit_now){

928

return;

929

}

930

931

747

switch(event){

932

748

default:

933

749

case AVAHI_RESOLVER_FAILURE:

934

750

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

935

751

" of type '%s' in domain '%s': %s\n", name, type, domain,

936

avahi_strerror(avahi_server_errno(mc.server)));

752

avahi_strerror(avahi_server_errno(mc->server)));

937

753

break;

938

754

939

755

case AVAHI_RESOLVER_FOUND:

945

761

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

946

762

ip, (intmax_t)interface, port);

947

763

}

948

int ret = start_mandos_communication(ip, port, interface,

949

avahi_proto_to_af(proto));

764

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

950

765

if(ret == 0){

951

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

952

767

}

953

768

}

954

769

}

964

779

const char *domain,

965

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

966

781

flags,

967

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

968

784

assert(b);

969

785

970

786

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

971

787

is removed from the LAN */

972

788

973

if(quit_now){

974

return;

975

}

976

977

789

switch(event){

978

790

default:

979

791

case AVAHI_BROWSER_FAILURE:

980

792

981

793

fprintf(stderr, "(Avahi browser) %s\n",

982

avahi_strerror(avahi_server_errno(mc.server)));

983

avahi_simple_poll_quit(mc.simple_poll);

794

avahi_strerror(avahi_server_errno(mc->server)));

795

avahi_simple_poll_quit(mc->simple_poll);

984

796

return;

985

797

986

798

case AVAHI_BROWSER_NEW:

989

801

the callback function is called the Avahi server will free the

990

802

resolver for us. */

991

803

992

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

993

name, type, domain, protocol, 0,

994

resolve_callback, NULL) == NULL)

804

if(!(avahi_s_service_resolver_new(mc->server, interface,

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

995

808

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

996

name, avahi_strerror(avahi_server_errno(mc.server)));

809

name, avahi_strerror(avahi_server_errno(mc->server)));

997

810

break;

998

811

999

812

case AVAHI_BROWSER_REMOVE:

1008

821

}

1009

822

}

1010

823

1011

/* stop main loop after sigterm has been called */

1012

static void handle_sigterm(int sig){

1013

if(quit_now){

1014

return;

1015

}

1016

quit_now = 1;

1017

signal_received = sig;

1018

int old_errno = errno;

1019

if(mc.simple_poll != NULL){

1020

avahi_simple_poll_quit(mc.simple_poll);

1021

}

1022

errno = old_errno;

1023

}

1024

1025

/*

1026

* This function determines if a directory entry in /sys/class/net

1027

* corresponds to an acceptable network device.

1028

* (This function is passed to scandir(3) as a filter function.)

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

if(if_entry->d_name[0] == '.'){

1040

return 0;

1041

}

1042

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1048

/* read line from flags_fd */

1049

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1050

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1051

flagstring[(size_t)to_read] = '\0';

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

tmpmax = strtoimax(flagstring, &tmp, 0);

1076

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1079

if(debug){

1080

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1081

flagstring, if_entry->d_name);

1082

}

1083

free(flagstring);

1084

return 0;

1085

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1088

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1090

if(debug){

1091

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1092

if_entry->d_name);

1093

}

1094

return 0;

1095

}

1096

/* Accept point-to-point devices only if connect_to is specified */

1097

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1098

if(debug){

1099

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1100

if_entry->d_name);

1101

}

1102

return 1;

1103

}

1104

/* Otherwise, reject non-broadcast-capable devices */

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1112

/* Accept this device */

1113

if(debug){

1114

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1115

if_entry->d_name);

1116

}

1117

return 1;

1118

}

1119

1120

824

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

1121

825

AvahiSServiceBrowser *sb = NULL;

1122

826

int error;

1123

827

int ret;

1124

828

intmax_t tmpmax;

1125

char *tmp;

829

int numchars;

1126

830

int exitcode = EXIT_SUCCESS;

1127

const char *interface = "";

831

const char *interface = "eth0";

1128

832

struct ifreq network;

1129

int sd = -1;

1130

bool take_down_interface = false;

833

int sd;

1131

834

uid_t uid;

1132

835

gid_t gid;

836

char *connect_to = NULL;

1133

837

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

1134

838

bool tempdir_created = false;

1135

839

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1136

840

const char *seckey = PATHDIR "/" SECKEY;

1137

841

const char *pubkey = PATHDIR "/" PUBKEY;

1138

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

1139

846

bool gnutls_initialized = false;

1140

847

bool gpgme_initialized = false;

1141

float delay = 2.5f;

1142

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

/* Lower any group privileges we might have, just to be safe */

1150

errno = 0;

1151

ret = setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

/* Lower user privileges (temporarily) */

1157

errno = 0;

1158

ret = seteuid(uid);

1159

if(ret == -1){

1160

perror("seteuid");

1161

}

1162

1163

if(quit_now){

1164

goto end;

1165

}

848

double delay = 2.5;

1166

849

1167

850

{

1168

851

struct argp_option options[] = {

1174

857

.group = 1 },

1175

858

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

1176

859

.arg = "NAME",

1177

.doc = "Network interface that will be used to search for"

1178

" Mandos servers",

860

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

861

" servers",

1179

862

.group = 1 },

1180

863

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

1181

864

.arg = "FILE",

1198

881

.arg = "SECONDS",

1199

882

.doc = "Maximum delay to wait for interface startup",

1200

883

.group = 2 },

1201

/*

1202

* These reproduce what we would get without ARGP_NO_HELP

1203

*/

1204

{ .name = "help", .key = '?',

1205

.doc = "Give this help list", .group = -1 },

1206

{ .name = "usage", .key = -3,

1207

.doc = "Give a short usage message", .group = -1 },

1208

{ .name = "version", .key = 'V',

1209

.doc = "Print program version", .group = -1 },

1210

884

{ .name = NULL }

1211

885

};

1212

886

1213

887

error_t parse_opt(int key, char *arg,

1214

888

struct argp_state *state){

1215

errno = 0;

1216

889

switch(key){

1217

890

case 128: /* --debug */

1218

891

debug = true;

1230

903

pubkey = arg;

1231

904

break;

1232

905

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

1233

errno = 0;

1234

tmpmax = strtoimax(arg, &tmp, 10);

1235

if(errno != 0 or tmp == arg or *tmp != '\0'

1236

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1237

argp_error(state, "Bad number of DH bits");

906

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

907

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

908

or arg[numchars] != '\0'){

909

fprintf(stderr, "Bad number of DH bits\n");

910

exit(EXIT_FAILURE);

1238

911

}

1239

912

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1240

913

break;

1242

915

mc.priority = arg;

1243

916

break;

1244

917

case 131: /* --delay */

1245

errno = 0;

1246

delay = strtof(arg, &tmp);

1247

if(errno != 0 or tmp == arg or *tmp != '\0'){

1248

argp_error(state, "Bad delay");

918

ret = sscanf(arg, "%lf%n", &delay, &numchars);

919

if(ret < 1 or arg[numchars] != '\0'){

920

fprintf(stderr, "Bad delay\n");

921

exit(EXIT_FAILURE);

1249

922

}

1250

923

break;

1251

/*

1252

* These reproduce what we would get without ARGP_NO_HELP

1253

*/

1254

case '?': /* --help */

1255

argp_state_help(state, state->out_stream,

1256

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1257

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1258

case -3: /* --usage */

1259

argp_state_help(state, state->out_stream,

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

case 'V': /* --version */

1262

fprintf(state->out_stream, "%s\n", argp_program_version);

1263

exit(argp_err_exit_status);

924

case ARGP_KEY_ARG:

925

argp_usage(state);

926

case ARGP_KEY_END:

1264

927

break;

1265

928

default:

1266

929

return ARGP_ERR_UNKNOWN;

1267

930

}

1268

return errno;

931

return 0;

1269

932

}

1270

933

1271

934

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

1272

935

.args_doc = "",

1273

936

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

1274

937

" passwords from a Mandos server" };

1275

ret = argp_parse(&argp, argc, argv,

1276

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1277

switch(ret){

1278

case 0:

1279

break;

1280

case ENOMEM:

1281

default:

1282

errno = ret;

1283

perror("argp_parse");

1284

exitcode = EX_OSERR;

1285

goto end;

1286

case EINVAL:

1287

exitcode = EX_USAGE;

1288

goto end;

1289

}

1290

}

1291

1292

if(not debug){

1293

avahi_set_log_function(empty_log);

1294

}

1295

1296

if(interface[0] == '\0'){

1297

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1299

alphasort);

1300

if(ret >= 1){

1301

/* Pick the first good interface */

1302

interface = strdup(direntries[0]->d_name);

1303

if(debug){

1304

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

1305

}

1306

if(interface == NULL){

1307

perror("malloc");

1308

free(direntries);

1309

exitcode = EXIT_FAILURE;

1310

goto end;

1311

}

1312

free(direntries);

1313

} else {

1314

free(direntries);

1315

fprintf(stderr, "Could not find a network interface\n");

938

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

939

if(ret == ARGP_ERR_UNKNOWN){

940

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

1316

941

exitcode = EXIT_FAILURE;

1317

942

goto end;

1318

943

}

1319

944

}

1320

945

1321

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1322

from the signal handler */

1323

/* Initialize the pseudo-RNG for Avahi */

1324

srand((unsigned int) time(NULL));

1325

mc.simple_poll = avahi_simple_poll_new();

1326

if(mc.simple_poll == NULL){

1327

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1328

exitcode = EX_UNAVAILABLE;

1329

goto end;

1330

}

1331

1332

sigemptyset(&sigterm_action.sa_mask);

1333

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1334

if(ret == -1){

1335

perror("sigaddset");

1336

exitcode = EX_OSERR;

1337

goto end;

1338

}

1339

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1340

if(ret == -1){

1341

perror("sigaddset");

1342

exitcode = EX_OSERR;

1343

goto end;

1344

}

1345

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1346

if(ret == -1){

1347

perror("sigaddset");

1348

exitcode = EX_OSERR;

1349

goto end;

1350

}

1351

/* Need to check if the handler is SIG_IGN before handling:

1352

| [[info:libc:Initial Signal Actions]] |

1353

| [[info:libc:Basic Signal Handling]] |

1354

*/

1355

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1356

if(ret == -1){

1357

perror("sigaction");

1358

return EX_OSERR;

1359

}

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

ret = sigaction(SIGINT, &sigterm_action, NULL);

1362

if(ret == -1){

1363

perror("sigaction");

1364

exitcode = EX_OSERR;

1365

goto end;

1366

}

1367

}

1368

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1369

if(ret == -1){

1370

perror("sigaction");

1371

return EX_OSERR;

1372

}

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1375

if(ret == -1){

1376

perror("sigaction");

1377

exitcode = EX_OSERR;

1378

goto end;

1379

}

1380

}

1381

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1382

if(ret == -1){

1383

perror("sigaction");

1384

return EX_OSERR;

1385

}

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1388

if(ret == -1){

1389

perror("sigaction");

1390

exitcode = EX_OSERR;

1391

goto end;

1392

}

1393

}

1394

1395

946

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

1396

if(strcmp(interface, "none") != 0){

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

if(if_index == 0){

1399

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

1400

exitcode = EX_UNAVAILABLE;

1401

goto end;

1402

}

1403

1404

if(quit_now){

1405

goto end;

1406

}

1407

1408

/* Re-raise priviliges */

1409

errno = 0;

1410

ret = seteuid(0);

1411

if(ret == -1){

1412

perror("seteuid");

1413

}

1414

947

{

1415

948

#ifdef __linux__

1416

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1417

messages about the network interface to mess up the prompt */

950

messages to mess up the prompt */

1418

951

ret = klogctl(8, NULL, 5);

1419

bool restore_loglevel = true;

1420

952

if(ret == -1){

1421

restore_loglevel = false;

1422

953

perror("klogctl");

1423

954

}

1424

#endif /* __linux__ */

955

#endif

1425

956

1426

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1427

958

if(sd < 0){

1428

959

perror("socket");

1429

exitcode = EX_OSERR;

960

exitcode = EXIT_FAILURE;

1430

961

#ifdef __linux__

1431

if(restore_loglevel){

1432

ret = klogctl(7, NULL, 0);

1433

if(ret == -1){

1434

perror("klogctl");

1435

}

1436

}

1437

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

962

ret = klogctl(7, NULL, 0);

1441

963

if(ret == -1){

1442

perror("seteuid");

964

perror("klogctl");

1443

965

}

966

#endif

1444

967

goto end;

1445

968

}

1446

969

strcpy(network.ifr_name, interface);

1448

971

if(ret == -1){

1449

972

perror("ioctl SIOCGIFFLAGS");

1450

973

#ifdef __linux__

1451

if(restore_loglevel){

1452

ret = klogctl(7, NULL, 0);

1453

if(ret == -1){

1454

perror("klogctl");

1455

}

1456

}

1457

#endif /* __linux__ */

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

974

ret = klogctl(7, NULL, 0);

1462

975

if(ret == -1){

1463

perror("seteuid");

976

perror("klogctl");

1464

977

}

978

#endif

979

exitcode = EXIT_FAILURE;

1465

980

goto end;

1466

981

}

1467

982

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

1468

983

network.ifr_flags |= IFF_UP;

1469

take_down_interface = true;

1470

984

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

1471

985

if(ret == -1){

1472

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

986

perror("ioctl SIOCSIFFLAGS");

987

exitcode = EXIT_FAILURE;

1475

988

#ifdef __linux__

1476

if(restore_loglevel){

1477

ret = klogctl(7, NULL, 0);

1478

if(ret == -1){

1479

perror("klogctl");

1480

}

1481

}

1482

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

989

ret = klogctl(7, NULL, 0);

1486

990

if(ret == -1){

1487

perror("seteuid");

991

perror("klogctl");

1488

992

}

993

#endif

1489

994

goto end;

1490

995

}

1491

996

}

1503

1008

perror("nanosleep");

1504

1009

}

1505

1010

}

1506

if(not take_down_interface){

1507

/* We won't need the socket anymore */

1508

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1509

if(ret == -1){

1510

perror("close");

1511

}

1011

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1012

if(ret == -1){

1013

perror("close");

1512

1014

}

1513

1015

#ifdef __linux__

1514

if(restore_loglevel){

1515

/* Restores kernel loglevel to default */

1516

ret = klogctl(7, NULL, 0);

1517

if(ret == -1){

1518

perror("klogctl");

1519

}

1520

}

1521

#endif /* __linux__ */

1522

/* Lower privileges */

1523

errno = 0;

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

1536

}

1537

}

1538

1539

if(quit_now){

1540

goto end;

1541

}

1542

1543

ret = init_gnutls_global(pubkey, seckey);

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1020

}

1021

#endif

1022

}

1023

1024

uid = getuid();

1025

gid = getgid();

1026

1027

setgid(gid);

1028

if(ret == -1){

1029

perror("setgid");

1030

}

1031

1032

ret = setuid(uid);

1033

if(ret == -1){

1034

perror("setuid");

1035

}

1036

1037

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

1544

1038

if(ret == -1){

1545

1039

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

1546

exitcode = EX_UNAVAILABLE;

1040

exitcode = EXIT_FAILURE;

1547

1041

goto end;

1548

1042

} else {

1549

1043

gnutls_initialized = true;

1550

1044

}

1551

1045

1552

if(quit_now){

1553

goto end;

1554

}

1555

1556

tempdir_created = true;

1557

1046

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1559

1047

perror("mkdtemp");

1560

1048

goto end;

1561

1049

}

1562

1563

if(quit_now){

1564

goto end;

1565

}

1566

1567

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

1050

tempdir_created = true;

1051

1052

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

1568

1053

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

1569

exitcode = EX_UNAVAILABLE;

1054

exitcode = EXIT_FAILURE;

1570

1055

goto end;

1571

1056

} else {

1572

1057

gpgme_initialized = true;

1573

1058

}

1574

1059

1575

if(quit_now){

1060

if_index = (AvahiIfIndex) if_nametoindex(interface);

1061

if(if_index == 0){

1062

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

1063

exitcode = EXIT_FAILURE;

1576

1064

goto end;

1577

1065

}

1578

1066

1582

1070

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

1583

1071

if(address == NULL){

1584

1072

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

1585

exitcode = EX_USAGE;

1586

goto end;

1587

}

1588

1589

if(quit_now){

1590

goto end;

1591

}

1592

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1075

}

1593

1076

uint16_t port;

1594

errno = 0;

1595

tmpmax = strtoimax(address+1, &tmp, 10);

1596

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1597

or tmpmax != (uint16_t)tmpmax){

1077

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1078

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1079

or address[numchars+1] != '\0'){

1598

1080

fprintf(stderr, "Bad port number\n");

1599

exitcode = EX_USAGE;

1600

goto end;

1601

}

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1081

exitcode = EXIT_FAILURE;

1082

goto end;

1083

}

1607

1084

port = (uint16_t)tmpmax;

1608

1085

*address = '\0';

1609

1086

address = connect_to;

1610

/* Colon in address indicates IPv6 */

1611

int af;

1612

if(strchr(address, ':') != NULL){

1613

af = AF_INET6;

1614

} else {

1615

af = AF_INET;

1616

}

1617

1618

if(quit_now){

1619

goto end;

1620

}

1621

1622

ret = start_mandos_communication(address, port, if_index, af);

1087

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

1623

1088

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1089

exitcode = EXIT_FAILURE;

1643

1090

} else {

1644

1091

exitcode = EXIT_SUCCESS;

1645

1092

}

1646

1093

goto end;

1647

1094

}

1648

1095

1649

if(quit_now){

1096

if(not debug){

1097

avahi_set_log_function(empty_log);

1098

}

1099

1100

/* Initialize the pseudo-RNG for Avahi */

1101

srand((unsigned int) time(NULL));

1102

1103

/* Allocate main Avahi loop object */

1104

mc.simple_poll = avahi_simple_poll_new();

1105

if(mc.simple_poll == NULL){

1106

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1107

exitcode = EXIT_FAILURE;

1650

1108

goto end;

1651

1109

}

1652

1110

1672

1130

if(mc.server == NULL){

1673

1131

fprintf(stderr, "Failed to create Avahi server: %s\n",

1674

1132

avahi_strerror(error));

1675

exitcode = EX_UNAVAILABLE;

1676

goto end;

1677

}

1678

1679

if(quit_now){

1133

exitcode = EXIT_FAILURE;

1680

1134

goto end;

1681

1135

}

1682

1136

1683

1137

/* Create the Avahi service browser */

1684

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1687

1141

if(sb == NULL){

1688

1142

fprintf(stderr, "Failed to create service browser: %s\n",

1689

1143

avahi_strerror(avahi_server_errno(mc.server)));

1690

exitcode = EX_UNAVAILABLE;

1691

goto end;

1692

}

1693

1694

if(quit_now){

1144

exitcode = EXIT_FAILURE;

1695

1145

goto end;

1696

1146

}

1697

1147

1729

1179

gpgme_release(mc.ctx);

1730

1180

}

1731

1181

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1737

if(ret == -1){

1738

perror("seteuid");

1739

}

1740

if(geteuid() == 0){

1741

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

1742

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

1745

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1746

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

1747

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1749

}

1750

}

1751

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1752

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

1760

}

1761

}

1762

}

1763

1764

1182

/* Removes the temp directory used by GPGME */

1765

1183

if(tempdir_created){

1766

1184

DIR *d;

1805

1223

}

1806

1224

}

1807

1225

1808

if(quit_now){

1809

sigemptyset(&old_sigterm_action.sa_mask);

1810

old_sigterm_action.sa_handler = SIG_DFL;

1811

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1812

&old_sigterm_action,

1813

NULL));

1814

if(ret == -1){

1815

perror("sigaction");

1816

}

1817

do {

1818

ret = raise(signal_received);

1819

} while(ret != 0 and errno == EINTR);

1820

if(ret != 0){

1821

perror("raise");

1822

abort();

1823

}

1824

TEMP_FAILURE_RETRY(pause());

1825

}

1826

1827

1226

return exitcode;

1828

1227

}