/mandos/trunk : revision 24.1.154

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

37

41

38

42

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

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

42

45

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

43

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

44

srand() */

45

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

46

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

47

strtof(), abort() */

48

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

46

49

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

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50

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

48

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

51

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

49

52

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

50

53

sockaddr_in6, PF_INET6,

51

SOCK_STREAM, INET6_ADDRSTRLEN,

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

53

DIR */

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

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56

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

55

57

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

56

struct in6_addr, inet_pton(),

57

connect() */

58

inet_pton(), connect() */

58

59

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

59

60

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

60

61

*/

61

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

62

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

63

strtoimax() */

62

64

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

63

65

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

64

66

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

65

67

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

66

68

SIOCSIFFLAGS, if_indextoname(),

67

69

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

70

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

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

69

73

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

70

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

71

setgid() */

74

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

75

setgid(), pause() */

72

76

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

73

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

77

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

74

78

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

75

79

argp_state, struct argp,

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

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

78

88

#ifdef __linux__

79

89

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

80

#endif

90

#endif /* __linux__ */

81

91

82

92

/* Avahi */

83

93

/* All Avahi types, constants and functions

129

139

gpgme_ctx_t ctx;

130

140

} mandos_context;

131

141

142

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

143

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

144

.dh_bits = 1024, .priority = "SECURE256"

145

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

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

132

150

/*

133

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

134

* "buffer_capacity" is how much is currently allocated,

151

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

152

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

135

153

* "buffer_length" is how much is already used.

136

154

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

155

size_t incbuffer(char **buffer, size_t buffer_length,

138

156

size_t buffer_capacity){

139

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

158

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

149

167

/*

150

168

* Initialize GPGME.

151

169

*/

152

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

170

static bool init_gpgme(const char *seckey,

153

171

const char *pubkey, const char *tempdir){

154

int ret;

155

172

gpgme_error_t rc;

156

173

gpgme_engine_info_t engine_info;

157

174

160

177

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

161

178

*/

162

179

bool import_key(const char *filename){

180

int ret;

163

181

int fd;

164

182

gpgme_data_t pgp_data;

165

183

176

194

return false;

177

195

}

178

196

179

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

180

198

if(rc != GPG_ERR_NO_ERROR){

181

199

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

182

200

gpgme_strsource(rc), gpgme_strerror(rc));

192

210

}

193

211

194

212

if(debug){

195

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

213

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

196

214

}

197

215

198

216

/* Init GPGME */

225

243

}

226

244

227

245

/* Create new GPGME "context" */

228

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

246

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

229

247

if(rc != GPG_ERR_NO_ERROR){

230

248

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

231

249

gpgme_strsource(rc), gpgme_strerror(rc));

236

254

return false;

237

255

}

238

256

239

return true;

257

return true;

240

258

}

241

259

242

260

/*

243

261

* Decrypt OpenPGP data.

244

262

* Returns -1 on error

245

263

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

265

size_t crypto_size,

249

266

char **plaintext){

250

267

gpgme_data_t dh_crypto, dh_plain;

277

294

278

295

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

279

296

data buffer */

280

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

297

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

281

298

if(rc != GPG_ERR_NO_ERROR){

282

299

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

283

300

gpgme_strsource(rc), gpgme_strerror(rc));

284

301

plaintext_length = -1;

285

302

if(debug){

286

303

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

288

305

if(result == NULL){

289

306

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

290

307

} else {

297

314

}

298

315

gpgme_recipient_t recipient;

299

316

recipient = result->recipients;

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

}

317

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

310

325

}

311

326

}

312

327

}

326

341

327

342

*plaintext = NULL;

328

343

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

344

plaintext_capacity = incbuffer(plaintext,

330

345

(size_t)plaintext_length,

331

346

plaintext_capacity);

332

347

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

348

perror("incbuffer");

334

349

plaintext_length = -1;

335

350

goto decrypt_end;

336

351

}

382

397

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

383

398

}

384

399

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

400

static int init_gnutls_global(const char *pubkeyfilename,

387

401

const char *seckeyfilename){

388

402

int ret;

389

403

407

421

}

408

422

409

423

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

411

425

if(ret != GNUTLS_E_SUCCESS){

412

426

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

413

* from

414

* -Wunreachable-code

415

*/

427

from

428

-Wunreachable-code

429

*/

416

430

safer_gnutls_strerror(ret));

417

431

gnutls_global_deinit();

418

432

return -1;

425

439

}

426

440

427

441

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

429

443

GNUTLS_OPENPGP_FMT_BASE64);

430

444

if(ret != GNUTLS_E_SUCCESS){

431

445

fprintf(stderr,

437

451

}

438

452

439

453

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

454

ret = gnutls_dh_params_init(&mc.dh_params);

441

455

if(ret != GNUTLS_E_SUCCESS){

442

456

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

443

457

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

444

458

goto globalfail;

445

459

}

446

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

460

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

447

461

if(ret != GNUTLS_E_SUCCESS){

448

462

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

449

463

safer_gnutls_strerror(ret));

450

464

goto globalfail;

451

465

}

452

466

453

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

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

468

455

469

return 0;

456

470

457

471

globalfail:

458

472

459

gnutls_certificate_free_credentials(mc->cred);

473

gnutls_certificate_free_credentials(mc.cred);

460

474

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_dh_params_deinit(mc.dh_params);

462

476

return -1;

463

477

}

464

478

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

479

static int init_gnutls_session(gnutls_session_t *session){

467

480

int ret;

468

481

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

470

488

if(ret != GNUTLS_E_SUCCESS){

471

489

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

472

490

safer_gnutls_strerror(ret));

474

492

475

493

{

476

494

const char *err;

477

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

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

478

502

if(ret != GNUTLS_E_SUCCESS){

479

503

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

480

504

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

484

508

}

485

509

}

486

510

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

489

519

if(ret != GNUTLS_E_SUCCESS){

490

520

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

491

521

safer_gnutls_strerror(ret));

494

524

}

495

525

496

526

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

528

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

530

502

531

return 0;

503

532

}

509

538

/* Called when a Mandos server is found */

510

539

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

511

540

AvahiIfIndex if_index,

512

mandos_context *mc){

513

int ret, tcp_sd;

541

int af){

542

int ret, tcp_sd = -1;

514

543

ssize_t sret;

515

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

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

516

548

char *buffer = NULL;

517

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

518

550

size_t buffer_length = 0;

519

551

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

521

552

size_t written;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

553

int retval = -1;

524

554

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &session);

555

int pf; /* Protocol family */

556

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

switch(af){

565

case AF_INET6:

566

pf = PF_INET6;

567

break;

568

case AF_INET:

569

pf = PF_INET;

570

break;

571

default:

572

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

573

errno = EINVAL;

574

return -1;

575

}

576

577

ret = init_gnutls_session(&session);

527

578

if(ret != 0){

528

579

return -1;

529

580

}

530

581

531

582

if(debug){

532

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

583

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

533

584

"\n", ip, port);

534

585

}

535

586

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

588

if(tcp_sd < 0){

589

int e = errno;

538

590

perror("socket");

539

return -1;

591

errno = e;

592

goto mandos_end;

540

593

}

541

594

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);

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

548

598

}

549

599

550

600

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

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);

601

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

604

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

607

}

555

608

if(ret < 0 ){

609

int e = errno;

556

610

perror("inet_pton");

557

return -1;

611

errno = e;

612

goto mandos_end;

558

613

}

559

614

if(ret == 0){

615

int e = errno;

560

616

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

561

return -1;

617

errno = e;

618

goto mandos_end;

562

619

}

563

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

620

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

628

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

633

}

634

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

636

}

637

} else {

638

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

564

639

-Wconversion and

565

640

-Wunreachable-code */

641

}

566

642

567

to.in6.sin6_scope_id = (uint32_t)if_index;

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

568

647

569

648

if(debug){

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){

649

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

650

char interface[IF_NAMESIZE];

651

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

652

perror("if_indextoname");

653

} else {

654

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

655

ip, interface, port);

656

}

657

} else {

658

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

659

port);

660

}

661

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

667

} else {

668

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

669

sizeof(addrstr));

670

}

671

if(pcret == NULL){

575

672

perror("inet_ntop");

576

673

} else {

577

674

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

580

677

}

581

678

}

582

679

583

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

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

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

687

} else {

688

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

689

}

584

690

if(ret < 0){

691

int e = errno;

585

692

perror("connect");

586

return -1;

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

587

700

}

588

701

589

702

const char *out = mandos_protocol_version;

593

706

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

594

707

out_size - written));

595

708

if(ret == -1){

709

int e = errno;

596

710

perror("write");

597

retval = -1;

711

errno = e;

598

712

goto mandos_end;

599

713

}

600

714

written += (size_t)ret;

608

722

break;

609

723

}

610

724

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

611

730

}

612

731

613

732

if(debug){

614

733

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

615

734

}

616

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

617

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

618

742

619

do{

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

620

749

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

621

754

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

622

755

623

756

if(ret != GNUTLS_E_SUCCESS){

625

758

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

626

759

gnutls_perror(ret);

627

760

}

628

retval = -1;

761

errno = EPROTO;

629

762

goto mandos_end;

630

763

}

631

764

632

765

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

633

766

634

767

if(debug){

635

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

768

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

636

769

ip);

637

770

}

638

771

639

772

while(true){

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

buffer_capacity = incbuffer(&buffer, buffer_length,

641

780

buffer_capacity);

642

781

if(buffer_capacity == 0){

643

perror("adjustbuffer");

644

retval = -1;

782

int e = errno;

783

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

645

790

goto mandos_end;

646

791

}

647

792

656

801

case GNUTLS_E_AGAIN:

657

802

break;

658

803

case GNUTLS_E_REHANDSHAKE:

659

do{

804

do {

660

805

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

661

811

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

662

812

if(ret < 0){

663

813

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

664

814

gnutls_perror(ret);

665

retval = -1;

815

errno = EPROTO;

666

816

goto mandos_end;

667

817

}

668

818

break;

669

819

default:

670

820

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

671

821

" encrypted session with Mandos server\n");

672

retval = -1;

673

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

674

824

goto mandos_end;

675

825

}

676

826

} else {

682

832

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

683

833

}

684

834

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

686

847

687

848

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

849

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

851

buffer_length,

690

852

&decrypted_buffer);

691

853

if(decrypted_buffer_size >= 0){

854

692

855

written = 0;

693

856

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

694

862

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

695

863

(size_t)decrypted_buffer_size - written,

696

864

stdout);

697

865

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

866

int e = errno;

698

867

if(debug){

699

868

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

700

869

strerror(errno));

701

870

}

702

retval = -1;

703

break;

871

errno = e;

872

goto mandos_end;

704

873

}

705

874

written += (size_t)ret;

706

875

}

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

876

retval = 0;

710

877

}

711

} else {

712

retval = -1;

713

878

}

714

879

715

880

/* Shutdown procedure */

716

881

717

882

mandos_end:

718

free(buffer);

719

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

720

if(ret == -1){

721

perror("close");

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

722

902

}

723

gnutls_deinit(session);

724

903

return retval;

725

904

}

726

905

727

906

static void resolve_callback(AvahiSServiceResolver *r,

728

907

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

908

AvahiProtocol proto,

730

909

AvahiResolverEvent event,

731

910

const char *name,

732

911

const char *type,

737

916

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

918

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

919

AVAHI_GCC_UNUSED void* userdata){

742

920

assert(r);

743

921

744

922

/* Called whenever a service has been resolved successfully or

745

923

timed out */

746

924

925

if(quit_now){

926

return;

927

}

928

747

929

switch(event){

748

930

default:

749

931

case AVAHI_RESOLVER_FAILURE:

750

932

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

751

933

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

752

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

934

avahi_strerror(avahi_server_errno(mc.server)));

753

935

break;

754

936

755

937

case AVAHI_RESOLVER_FOUND:

761

943

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

762

944

ip, (intmax_t)interface, port);

763

945

}

764

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

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

765

948

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

949

avahi_simple_poll_quit(mc.simple_poll);

767

950

}

768

951

}

769

952

}

779

962

const char *domain,

780

963

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

964

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

965

AVAHI_GCC_UNUSED void* userdata){

784

966

assert(b);

785

967

786

968

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

787

969

is removed from the LAN */

788

970

971

if(quit_now){

972

return;

973

}

974

789

975

switch(event){

790

976

default:

791

977

case AVAHI_BROWSER_FAILURE:

792

978

793

979

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

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

796

982

return;

797

983

798

984

case AVAHI_BROWSER_NEW:

801

987

the callback function is called the Avahi server will free the

802

988

resolver for us. */

803

989

804

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

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

808

993

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

809

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

994

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

810

995

break;

811

996

812

997

case AVAHI_BROWSER_REMOVE:

821

1006

}

822

1007

}

823

1008

1009

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

1010

static void handle_sigterm(int sig){

1011

if(quit_now){

1012

return;

1013

}

1014

quit_now = 1;

1015

signal_received = sig;

1016

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1021

}

1022

824

1023

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

825

1024

AvahiSServiceBrowser *sb = NULL;

826

1025

int error;

827

1026

int ret;

828

1027

intmax_t tmpmax;

829

int numchars;

1028

char *tmp;

830

1029

int exitcode = EXIT_SUCCESS;

831

1030

const char *interface = "eth0";

832

1031

struct ifreq network;

833

int sd;

1032

int sd = -1;

1033

bool take_down_interface = false;

834

1034

uid_t uid;

835

1035

gid_t gid;

836

1036

char *connect_to = NULL;

840

1040

const char *seckey = PATHDIR "/" SECKEY;

841

1041

const char *pubkey = PATHDIR "/" PUBKEY;

842

1042

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

846

1043

bool gnutls_initialized = false;

847

1044

bool gpgme_initialized = false;

848

double delay = 2.5;

1045

float delay = 2.5f;

1046

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

1050

uid = getuid();

1051

gid = getgid();

1052

1053

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

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

849

1070

850

1071

{

851

1072

struct argp_option options[] = {

857

1078

.group = 1 },

858

1079

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

859

1080

.arg = "NAME",

860

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

861

" servers",

1081

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

1082

" Mandos servers",

862

1083

.group = 1 },

863

1084

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

864

1085

.arg = "FILE",

881

1102

.arg = "SECONDS",

882

1103

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

883

1104

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

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

1109

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

1110

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

1111

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

1112

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

1113

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

884

1114

{ .name = NULL }

885

1115

};

886

1116

887

1117

error_t parse_opt(int key, char *arg,

888

1118

struct argp_state *state){

1119

errno = 0;

889

1120

switch(key){

890

1121

case 128: /* --debug */

891

1122

debug = true;

903

1134

pubkey = arg;

904

1135

break;

905

1136

case 129: /* --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);

1137

errno = 0;

1138

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

1139

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

1140

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

1141

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

911

1142

}

912

1143

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

913

1144

break;

915

1146

mc.priority = arg;

916

1147

break;

917

1148

case 131: /* --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);

1149

errno = 0;

1150

delay = strtof(arg, &tmp);

1151

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

1152

argp_error(state, "Bad delay");

922

1153

}

923

1154

break;

924

case ARGP_KEY_ARG:

925

argp_usage(state);

926

case ARGP_KEY_END:

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

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

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

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

1166

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

1167

exit(argp_err_exit_status);

927

1168

break;

928

1169

default:

929

1170

return ARGP_ERR_UNKNOWN;

930

1171

}

931

return 0;

1172

return errno;

932

1173

}

933

1174

934

1175

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

935

1176

.args_doc = "",

936

1177

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

937

1178

" passwords from a Mandos server" };

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");

941

exitcode = EXIT_FAILURE;

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

1192

goto end;

1193

}

1194

}

1195

1196

if(not debug){

1197

avahi_set_log_function(empty_log);

1198

}

1199

1200

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

1201

from the signal handler */

1202

/* Initialize the pseudo-RNG for Avahi */

1203

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

1207

exitcode = EX_UNAVAILABLE;

1208

goto end;

1209

}

1210

1211

sigemptyset(&sigterm_action.sa_mask);

1212

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

1213

if(ret == -1){

1214

perror("sigaddset");

1215

exitcode = EX_OSERR;

1216

goto end;

1217

}

1218

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

1219

if(ret == -1){

1220

perror("sigaddset");

1221

exitcode = EX_OSERR;

1222

goto end;

1223

}

1224

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

1225

if(ret == -1){

1226

perror("sigaddset");

1227

exitcode = EX_OSERR;

1228

goto end;

1229

}

1230

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

1231

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

1232

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

1233

*/

1234

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

1235

if(ret == -1){

1236

perror("sigaction");

1237

return EX_OSERR;

1238

}

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

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

1241

if(ret == -1){

1242

perror("sigaction");

1243

exitcode = EX_OSERR;

1244

goto end;

1245

}

1246

}

1247

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

1248

if(ret == -1){

1249

perror("sigaction");

1250

return EX_OSERR;

1251

}

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

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

1254

if(ret == -1){

1255

perror("sigaction");

1256

exitcode = EX_OSERR;

1257

goto end;

1258

}

1259

}

1260

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

1261

if(ret == -1){

1262

perror("sigaction");

1263

return EX_OSERR;

1264

}

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

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

1267

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

942

1270

goto end;

943

1271

}

944

1272

}

945

1273

946

1274

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

947

{

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

948

1294

#ifdef __linux__

949

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

messages to mess up the prompt */

1296

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

951

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

952

1299

if(ret == -1){

1300

restore_loglevel = false;

953

1301

perror("klogctl");

954

1302

}

955

#endif

1303

#endif /* __linux__ */

956

1304

957

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1306

if(sd < 0){

959

1307

perror("socket");

960

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

961

1309

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

963

1320

if(ret == -1){

964

perror("klogctl");

1321

perror("seteuid");

965

1322

}

966

#endif

967

1323

goto end;

968

1324

}

969

1325

strcpy(network.ifr_name, interface);

971

1327

if(ret == -1){

972

1328

perror("ioctl SIOCGIFFLAGS");

973

1329

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

975

1341

if(ret == -1){

976

perror("klogctl");

1342

perror("seteuid");

977

1343

}

978

#endif

979

exitcode = EXIT_FAILURE;

980

1344

goto end;

981

1345

}

982

1346

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

983

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

984

1349

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

985

1350

if(ret == -1){

1351

take_down_interface = false;

986

1352

perror("ioctl SIOCSIFFLAGS");

987

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

988

1354

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

1359

}

1360

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

990

1365

if(ret == -1){

991

perror("klogctl");

1366

perror("seteuid");

992

1367

}

993

#endif

994

1368

goto end;

995

1369

}

996

1370

}

1008

1382

perror("nanosleep");

1009

1383

}

1010

1384

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1014

1391

}

1015

1392

#ifdef __linux__

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);

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1416

}

1417

1418

if(quit_now){

1419

goto end;

1420

}

1421

1422

ret = init_gnutls_global(pubkey, seckey);

1038

1423

if(ret == -1){

1039

1424

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

1040

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1041

1426

goto end;

1042

1427

} else {

1043

1428

gnutls_initialized = true;

1044

1429

}

1045

1430

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1046

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1047

1438

perror("mkdtemp");

1048

1439

goto end;

1049

1440

}

1050

tempdir_created = true;

1051

1052

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

1441

1442

if(quit_now){

1443

goto end;

1444

}

1445

1446

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

1053

1447

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

1054

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1055

1449

goto end;

1056

1450

} else {

1057

1451

gpgme_initialized = true;

1058

1452

}

1059

1453

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;

1454

if(quit_now){

1064

1455

goto end;

1065

1456

}

1066

1457

1070

1461

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

1071

1462

if(address == NULL){

1072

1463

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

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1075

}

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1076

1472

uint16_t port;

1077

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

1078

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

1079

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

1473

errno = 0;

1474

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

1475

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

1476

or tmpmax != (uint16_t)tmpmax){

1080

1477

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

1081

exitcode = EXIT_FAILURE;

1082

goto end;

1083

}

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1084

1486

port = (uint16_t)tmpmax;

1085

1487

*address = '\0';

1086

1488

address = connect_to;

1087

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

1489

/* Colon in address indicates IPv6 */

1490

int af;

1491

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

1492

af = AF_INET6;

1493

} else {

1494

af = AF_INET;

1495

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1501

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

1088

1502

if(ret < 0){

1089

exitcode = EXIT_FAILURE;

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1090

1522

} else {

1091

1523

exitcode = EXIT_SUCCESS;

1092

1524

}

1093

1525

goto end;

1094

1526

}

1095

1527

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;

1528

if(quit_now){

1108

1529

goto end;

1109

1530

}

1110

1531

1130

1551

if(mc.server == NULL){

1131

1552

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

1132

1553

avahi_strerror(error));

1133

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1134

1559

goto end;

1135

1560

}

1136

1561

1137

1562

/* Create the Avahi service browser */

1138

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

1141

1566

if(sb == NULL){

1142

1567

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

1143

1568

avahi_strerror(avahi_server_errno(mc.server)));

1144

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1145

1574

goto end;

1146

1575

}

1147

1576

1179

1608

gpgme_release(mc.ctx);

1180

1609

}

1181

1610

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1182

1643

/* Removes the temp directory used by GPGME */

1183

1644

if(tempdir_created){

1184

1645

DIR *d;

1223

1684

}

1224

1685

}

1225

1686

1687

if(quit_now){

1688

sigemptyset(&old_sigterm_action.sa_mask);

1689

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1693

if(ret == -1){

1694

perror("sigaction");

1695

}

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1704

}

1705

1226

1706

return exitcode;

1227

1707

}