/mandos/release : revision 237.2.56

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

43

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

47

srand(), strtof(), abort() */

48

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

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 */

86

87

78

#ifdef __linux__

88

79

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

89

#endif /* __linux__ */

80

#endif

90

81

91

82

/* Avahi */

92

83

/* All Avahi types, constants and functions

138

129

gpgme_ctx_t ctx;

139

130

} mandos_context;

140

131

141

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

142

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

143

.dh_bits = 1024, .priority = "SECURE256"

144

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

145

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

149

132

/*

150

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

151

* 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,

152

135

* "buffer_length" is how much is already used.

153

136

*/

154

size_t incbuffer(char **buffer, size_t buffer_length,

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

155

138

size_t buffer_capacity){

156

139

if(buffer_length + BUFFER_SIZE > buffer_capacity){

157

140

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

166

149

/*

167

150

* Initialize GPGME.

168

151

*/

169

static bool init_gpgme(const char *seckey,

152

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

170

153

const char *pubkey, const char *tempdir){

154

int ret;

171

155

gpgme_error_t rc;

172

156

gpgme_engine_info_t engine_info;

173

157

176

160

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

177

161

*/

178

162

bool import_key(const char *filename){

179

int ret;

180

163

int fd;

181

164

gpgme_data_t pgp_data;

182

165

193

176

return false;

194

177

}

195

178

196

rc = gpgme_op_import(mc.ctx, pgp_data);

179

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

197

180

if(rc != GPG_ERR_NO_ERROR){

198

181

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

199

182

gpgme_strsource(rc), gpgme_strerror(rc));

209

192

}

210

193

211

194

if(debug){

212

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

195

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

213

196

}

214

197

215

198

/* Init GPGME */

242

225

}

243

226

244

227

/* Create new GPGME "context" */

245

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

228

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

246

229

if(rc != GPG_ERR_NO_ERROR){

247

230

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

248

231

gpgme_strsource(rc), gpgme_strerror(rc));

253

236

return false;

254

237

}

255

238

256

return true;

239

return true;

257

240

}

258

241

259

242

/*

260

243

* Decrypt OpenPGP data.

261

244

* Returns -1 on error

262

245

*/

263

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

264

248

size_t crypto_size,

265

249

char **plaintext){

266

250

gpgme_data_t dh_crypto, dh_plain;

293

277

294

278

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

295

279

data buffer */

296

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

280

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

297

281

if(rc != GPG_ERR_NO_ERROR){

298

282

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

299

283

gpgme_strsource(rc), gpgme_strerror(rc));

300

284

plaintext_length = -1;

301

285

if(debug){

302

286

gpgme_decrypt_result_t result;

303

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

304

288

if(result == NULL){

305

289

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

306

290

} else {

313

297

}

314

298

gpgme_recipient_t recipient;

315

299

recipient = result->recipients;

316

while(recipient != NULL){

317

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

318

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

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

320

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

321

recipient->status == GPG_ERR_NO_SECKEY

322

? "No" : "Yes");

323

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

}

324

310

}

325

311

}

326

312

}

340

326

341

327

*plaintext = NULL;

342

328

while(true){

343

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

344

330

(size_t)plaintext_length,

345

331

plaintext_capacity);

346

332

if(plaintext_capacity == 0){

347

perror("incbuffer");

333

perror("adjustbuffer");

348

334

plaintext_length = -1;

349

335

goto decrypt_end;

350

336

}

396

382

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

397

383

}

398

384

399

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

400

387

const char *seckeyfilename){

401

388

int ret;

402

389

420

407

}

421

408

422

409

/* OpenPGP credentials */

423

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

424

411

if(ret != GNUTLS_E_SUCCESS){

425

412

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

426

from

427

-Wunreachable-code

428

*/

413

* from

414

* -Wunreachable-code

415

*/

429

416

safer_gnutls_strerror(ret));

430

417

gnutls_global_deinit();

431

418

return -1;

438

425

}

439

426

440

427

ret = gnutls_certificate_set_openpgp_key_file

441

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

442

429

GNUTLS_OPENPGP_FMT_BASE64);

443

430

if(ret != GNUTLS_E_SUCCESS){

444

431

fprintf(stderr,

450

437

}

451

438

452

439

/* GnuTLS server initialization */

453

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

454

441

if(ret != GNUTLS_E_SUCCESS){

455

442

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

456

443

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

457

444

goto globalfail;

458

445

}

459

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

446

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

460

447

if(ret != GNUTLS_E_SUCCESS){

461

448

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

462

449

safer_gnutls_strerror(ret));

463

450

goto globalfail;

464

451

}

465

452

466

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

467

454

468

455

return 0;

469

456

470

457

globalfail:

471

458

472

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

473

460

gnutls_global_deinit();

474

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

475

462

return -1;

476

463

}

477

464

478

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

479

467

int ret;

480

468

/* GnuTLS session creation */

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

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

469

ret = gnutls_init(session, GNUTLS_SERVER);

487

470

if(ret != GNUTLS_E_SUCCESS){

488

471

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

489

472

safer_gnutls_strerror(ret));

491

474

492

475

{

493

476

const char *err;

494

do {

495

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

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

477

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

501

478

if(ret != GNUTLS_E_SUCCESS){

502

479

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

503

480

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

507

484

}

508

485

}

509

486

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

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

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

518

489

if(ret != GNUTLS_E_SUCCESS){

519

490

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

520

491

safer_gnutls_strerror(ret));

523

494

}

524

495

525

496

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

527

499

528

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

501

530

502

return 0;

531

503

}

537

509

/* Called when a Mandos server is found */

538

510

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

539

511

AvahiIfIndex if_index,

540

int af){

541

int ret, tcp_sd = -1;

512

mandos_context *mc){

513

int ret, tcp_sd;

542

514

ssize_t sret;

543

union {

544

struct sockaddr_in in;

545

struct sockaddr_in6 in6;

546

} to;

515

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

547

516

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

517

char *decrypted_buffer;

549

518

size_t buffer_length = 0;

550

519

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

551

521

size_t written;

552

int retval = -1;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

553

524

gnutls_session_t session;

554

int pf; /* Protocol family */

555

556

if(quit_now){

557

return -1;

558

}

559

560

switch(af){

561

case AF_INET6:

562

pf = PF_INET6;

563

break;

564

case AF_INET:

565

pf = PF_INET;

566

break;

567

default:

568

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

569

return -1;

570

}

571

572

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

573

527

if(ret != 0){

574

528

return -1;

575

529

}

576

530

577

531

if(debug){

578

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

532

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

579

533

"\n", ip, port);

580

534

}

581

535

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

583

537

if(tcp_sd < 0){

584

538

perror("socket");

585

goto mandos_end;

539

return -1;

586

540

}

587

541

588

if(quit_now){

589

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);

590

548

}

591

549

592

550

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

593

if(af == AF_INET6){

594

to.in6.sin6_family = (sa_family_t)af;

595

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

596

} else { /* IPv4 */

597

to.in.sin_family = (sa_family_t)af;

598

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

599

}

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);

600

555

if(ret < 0 ){

601

556

perror("inet_pton");

602

goto mandos_end;

557

return -1;

603

558

}

604

559

if(ret == 0){

605

560

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

606

goto mandos_end;

561

return -1;

607

562

}

608

if(af == AF_INET6){

609

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

610

-Wconversion and

611

-Wunreachable-code */

612

613

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

614

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

615

-Wunreachable-code*/

616

if(if_index == AVAHI_IF_UNSPEC){

617

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

618

" without a network interface\n");

619

goto mandos_end;

620

}

621

/* Set the network interface number as scope */

622

to.in6.sin6_scope_id = (uint32_t)if_index;

623

}

624

} else {

625

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

563

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

626

564

-Wconversion and

627

565

-Wunreachable-code */

628

}

629

566

630

if(quit_now){

631

goto mandos_end;

632

}

567

to.in6.sin6_scope_id = (uint32_t)if_index;

633

568

634

569

if(debug){

635

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

636

char interface[IF_NAMESIZE];

637

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

638

perror("if_indextoname");

639

} else {

640

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

641

ip, interface, port);

642

}

643

} else {

644

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

645

port);

646

}

647

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

648

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

649

const char *pcret;

650

if(af == AF_INET6){

651

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

652

sizeof(addrstr));

653

} else {

654

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

655

sizeof(addrstr));

656

}

657

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){

658

575

perror("inet_ntop");

659

576

} else {

660

577

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

663

580

}

664

581

}

665

582

666

if(quit_now){

667

goto mandos_end;

668

}

669

670

if(af == AF_INET6){

671

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

672

} else {

673

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

674

}

583

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

675

584

if(ret < 0){

676

585

perror("connect");

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

586

return -1;

682

587

}

683

588

684

589

const char *out = mandos_protocol_version;

689

594

out_size - written));

690

595

if(ret == -1){

691

596

perror("write");

597

retval = -1;

692

598

goto mandos_end;

693

599

}

694

600

written += (size_t)ret;

702

608

break;

703

609

}

704

610

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

709

611

}

710

612

711

613

if(debug){

712

614

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

713

615

}

714

616

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

617

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

720

618

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

619

do{

726

620

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

730

621

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

731

622

732

623

if(ret != GNUTLS_E_SUCCESS){

734

625

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

735

626

gnutls_perror(ret);

736

627

}

628

retval = -1;

737

629

goto mandos_end;

738

630

}

739

631

740

632

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

741

633

742

634

if(debug){

743

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

635

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

744

636

ip);

745

637

}

746

638

747

639

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

753

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

754

641

buffer_capacity);

755

642

if(buffer_capacity == 0){

756

perror("incbuffer");

757

goto mandos_end;

758

}

759

760

if(quit_now){

643

perror("adjustbuffer");

644

retval = -1;

761

645

goto mandos_end;

762

646

}

763

647

772

656

case GNUTLS_E_AGAIN:

773

657

break;

774

658

case GNUTLS_E_REHANDSHAKE:

775

do {

659

do{

776

660

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

781

661

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

782

662

if(ret < 0){

783

663

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

784

664

gnutls_perror(ret);

665

retval = -1;

785

666

goto mandos_end;

786

667

}

787

668

break;

788

669

default:

789

670

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

790

671

" encrypted session with Mandos server\n");

672

retval = -1;

791

673

gnutls_bye(session, GNUTLS_SHUT_RDWR);

792

674

goto mandos_end;

793

675

}

800

682

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

801

683

}

802

684

803

if(quit_now){

804

goto mandos_end;

805

}

806

807

do {

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

809

if(quit_now){

810

goto mandos_end;

811

}

812

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

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

813

686

814

687

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

816

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

817

689

buffer_length,

818

690

&decrypted_buffer);

819

691

if(decrypted_buffer_size >= 0){

820

821

692

written = 0;

822

693

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

827

694

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

828

695

(size_t)decrypted_buffer_size - written,

829

696

stdout);

832

699

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

833

700

strerror(errno));

834

701

}

835

goto mandos_end;

702

retval = -1;

703

break;

836

704

}

837

705

written += (size_t)ret;

838

706

}

839

retval = 0;

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

840

710

}

711

} else {

712

retval = -1;

841

713

}

842

714

843

715

/* Shutdown procedure */

844

716

845

717

mandos_end:

846

free(decrypted_buffer);

847

718

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

719

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

851

720

if(ret == -1){

852

721

perror("close");

853

722

}

854

723

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

858

724

return retval;

859

725

}

860

726

861

727

static void resolve_callback(AvahiSServiceResolver *r,

862

728

AvahiIfIndex interface,

863

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

864

730

AvahiResolverEvent event,

865

731

const char *name,

866

732

const char *type,

871

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

872

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

873

739

flags,

874

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

875

742

assert(r);

876

743

877

744

/* Called whenever a service has been resolved successfully or

878

745

timed out */

879

746

880

if(quit_now){

881

return;

882

}

883

884

747

switch(event){

885

748

default:

886

749

case AVAHI_RESOLVER_FAILURE:

887

750

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

888

751

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

889

avahi_strerror(avahi_server_errno(mc.server)));

752

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

890

753

break;

891

754

892

755

case AVAHI_RESOLVER_FOUND:

898

761

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

899

762

ip, (intmax_t)interface, port);

900

763

}

901

int ret = start_mandos_communication(ip, port, interface,

902

avahi_proto_to_af(proto));

764

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

903

765

if(ret == 0){

904

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

905

767

}

906

768

}

907

769

}

917

779

const char *domain,

918

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

919

781

flags,

920

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

921

784

assert(b);

922

785

923

786

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

924

787

is removed from the LAN */

925

788

926

if(quit_now){

927

return;

928

}

929

930

789

switch(event){

931

790

default:

932

791

case AVAHI_BROWSER_FAILURE:

933

792

934

793

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

935

avahi_strerror(avahi_server_errno(mc.server)));

936

avahi_simple_poll_quit(mc.simple_poll);

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

937

796

return;

938

797

939

798

case AVAHI_BROWSER_NEW:

942

801

the callback function is called the Avahi server will free the

943

802

resolver for us. */

944

803

945

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

946

name, type, domain, protocol, 0,

947

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)))

948

808

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

949

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

809

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

950

810

break;

951

811

952

812

case AVAHI_BROWSER_REMOVE:

961

821

}

962

822

}

963

823

964

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

965

static void handle_sigterm(int sig){

966

if(quit_now){

967

return;

968

}

969

quit_now = 1;

970

signal_received = sig;

971

int old_errno = errno;

972

if(mc.simple_poll != NULL){

973

avahi_simple_poll_quit(mc.simple_poll);

974

}

975

errno = old_errno;

976

}

977

978

824

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

979

825

AvahiSServiceBrowser *sb = NULL;

980

826

int error;

981

827

int ret;

982

828

intmax_t tmpmax;

983

char *tmp;

829

int numchars;

984

830

int exitcode = EXIT_SUCCESS;

985

831

const char *interface = "eth0";

986

832

struct ifreq network;

987

int sd = -1;

988

bool take_down_interface = false;

833

int sd;

989

834

uid_t uid;

990

835

gid_t gid;

991

836

char *connect_to = NULL;

995

840

const char *seckey = PATHDIR "/" SECKEY;

996

841

const char *pubkey = PATHDIR "/" PUBKEY;

997

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

998

846

bool gnutls_initialized = false;

999

847

bool gpgme_initialized = false;

1000

float delay = 2.5f;

1001

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1004

1005

uid = getuid();

1006

gid = getgid();

1007

1008

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

1009

errno = 0;

1010

ret = setgid(gid);

1011

if(ret == -1){

1012

perror("setgid");

1013

}

1014

1015

/* Lower user privileges (temporarily) */

1016

errno = 0;

1017

ret = seteuid(uid);

1018

if(ret == -1){

1019

perror("seteuid");

1020

}

1021

1022

if(quit_now){

1023

goto end;

1024

}

848

double delay = 2.5;

1025

849

1026

850

{

1027

851

struct argp_option options[] = {

1033

857

.group = 1 },

1034

858

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

1035

859

.arg = "NAME",

1036

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

1037

" Mandos servers",

860

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

861

" servers",

1038

862

.group = 1 },

1039

863

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

1040

864

.arg = "FILE",

1057

881

.arg = "SECONDS",

1058

882

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

1059

883

.group = 2 },

1060

/*

1061

* These reproduce what we would get without ARGP_NO_HELP

1062

*/

1063

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

1064

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

1065

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

1066

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

1067

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

1068

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

1069

884

{ .name = NULL }

1070

885

};

1071

886

1072

887

error_t parse_opt(int key, char *arg,

1073

888

struct argp_state *state){

1074

errno = 0;

1075

889

switch(key){

1076

890

case 128: /* --debug */

1077

891

debug = true;

1089

903

pubkey = arg;

1090

904

break;

1091

905

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

1092

errno = 0;

1093

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

1094

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

1095

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

1096

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);

1097

911

}

1098

912

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

1099

913

break;

1101

915

mc.priority = arg;

1102

916

break;

1103

917

case 131: /* --delay */

1104

errno = 0;

1105

delay = strtof(arg, &tmp);

1106

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

1107

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);

1108

922

}

1109

923

break;

1110

/*

1111

* These reproduce what we would get without ARGP_NO_HELP

1112

*/

1113

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

1114

argp_state_help(state, state->out_stream,

1115

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1116

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1117

case -3: /* --usage */

1118

argp_state_help(state, state->out_stream,

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1120

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

1121

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

1122

exit(argp_err_exit_status);

924

case ARGP_KEY_ARG:

925

argp_usage(state);

926

case ARGP_KEY_END:

1123

927

break;

1124

928

default:

1125

929

return ARGP_ERR_UNKNOWN;

1126

930

}

1127

return errno;

931

return 0;

1128

932

}

1129

933

1130

934

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

1131

935

.args_doc = "",

1132

936

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

1133

937

" passwords from a Mandos server" };

1134

ret = argp_parse(&argp, argc, argv,

1135

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1136

switch(ret){

1137

case 0:

1138

break;

1139

case ENOMEM:

1140

default:

1141

errno = ret;

1142

perror("argp_parse");

1143

exitcode = EX_OSERR;

1144

goto end;

1145

case EINVAL:

1146

exitcode = EX_USAGE;

1147

goto end;

1148

}

1149

}

1150

1151

if(not debug){

1152

avahi_set_log_function(empty_log);

1153

}

1154

1155

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

1156

from the signal handler */

1157

/* Initialize the pseudo-RNG for Avahi */

1158

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

1159

mc.simple_poll = avahi_simple_poll_new();

1160

if(mc.simple_poll == NULL){

1161

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

1162

exitcode = EXIT_FAILURE;

1163

goto end;

1164

}

1165

1166

sigemptyset(&sigterm_action.sa_mask);

1167

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

1168

if(ret == -1){

1169

perror("sigaddset");

1170

exitcode = EXIT_FAILURE;

1171

goto end;

1172

}

1173

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

1174

if(ret == -1){

1175

perror("sigaddset");

1176

exitcode = EXIT_FAILURE;

1177

goto end;

1178

}

1179

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

1180

if(ret == -1){

1181

perror("sigaddset");

1182

exitcode = EXIT_FAILURE;

1183

goto end;

1184

}

1185

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

1186

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

1187

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

1188

*/

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

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

1203

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1206

}

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

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

1209

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1214

}

1215

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

1216

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1219

}

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

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

1222

if(ret == -1){

1223

perror("sigaction");

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");

1224

941

exitcode = EXIT_FAILURE;

1225

942

goto end;

1226

943

}

1227

944

}

1228

945

1229

946

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

1230

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

947

{

1249

948

#ifdef __linux__

1250

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

950

messages to mess up the prompt */

1252

951

ret = klogctl(8, NULL, 5);

1253

bool restore_loglevel = true;

1254

952

if(ret == -1){

1255

restore_loglevel = false;

1256

953

perror("klogctl");

1257

954

}

1258

#endif /* __linux__ */

955

#endif

1259

956

1260

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1261

958

if(sd < 0){

1262

959

perror("socket");

1263

960

exitcode = EXIT_FAILURE;

1264

961

#ifdef __linux__

1265

if(restore_loglevel){

1266

ret = klogctl(7, NULL, 0);

1267

if(ret == -1){

1268

perror("klogctl");

1269

}

1270

}

1271

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

962

ret = klogctl(7, NULL, 0);

1275

963

if(ret == -1){

1276

perror("seteuid");

964

perror("klogctl");

1277

965

}

966

#endif

1278

967

goto end;

1279

968

}

1280

969

strcpy(network.ifr_name, interface);

1282

971

if(ret == -1){

1283

972

perror("ioctl SIOCGIFFLAGS");

1284

973

#ifdef __linux__

1285

if(restore_loglevel){

1286

ret = klogctl(7, NULL, 0);

1287

if(ret == -1){

1288

perror("klogctl");

1289

}

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1290

977

}

1291

#endif /* __linux__ */

978

#endif

1292

979

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

980

goto end;

1300

981

}

1301

982

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

1302

983

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

984

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

1305

985

if(ret == -1){

1306

take_down_interface = false;

1307

986

perror("ioctl SIOCSIFFLAGS");

1308

987

exitcode = EXIT_FAILURE;

1309

988

#ifdef __linux__

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);

989

ret = klogctl(7, NULL, 0);

1320

990

if(ret == -1){

1321

perror("seteuid");

991

perror("klogctl");

1322

992

}

993

#endif

1323

994

goto end;

1324

995

}

1325

996

}

1337

1008

perror("nanosleep");

1338

1009

}

1339

1010

}

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1346

1014

}

1347

1015

#ifdef __linux__

1348

if(restore_loglevel){

1349

/* Restores kernel loglevel to default */

1350

ret = klogctl(7, NULL, 0);

1351

if(ret == -1){

1352

perror("klogctl");

1353

}

1354

}

1355

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

1364

} else {

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

1371

}

1372

1373

if(quit_now){

1374

goto end;

1375

}

1376

1377

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);

1378

1038

if(ret == -1){

1379

1039

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

1380

1040

exitcode = EXIT_FAILURE;

1383

1043

gnutls_initialized = true;

1384

1044

}

1385

1045

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1391

1046

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

1047

perror("mkdtemp");

1394

1048

goto end;

1395

1049

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1400

1401

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

1050

tempdir_created = true;

1051

1052

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

1402

1053

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

1403

1054

exitcode = EXIT_FAILURE;

1404

1055

goto end;

1406

1057

gpgme_initialized = true;

1407

1058

}

1408

1059

1409

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;

1410

1064

goto end;

1411

1065

}

1412

1066

1419

1073

exitcode = EXIT_FAILURE;

1420

1074

goto end;

1421

1075

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1427

1076

uint16_t port;

1428

errno = 0;

1429

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

1430

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

1431

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'){

1432

1080

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

1433

1081

exitcode = EXIT_FAILURE;

1434

1082

goto end;

1435

1083

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1441

1084

port = (uint16_t)tmpmax;

1442

1085

*address = '\0';

1443

1086

address = connect_to;

1444

/* Colon in address indicates IPv6 */

1445

int af;

1446

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

1447

af = AF_INET6;

1448

} else {

1449

af = AF_INET;

1450

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1456

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

1087

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

1457

1088

if(ret < 0){

1458

1089

exitcode = EXIT_FAILURE;

1459

1090

} else {

1462

1093

goto end;

1463

1094

}

1464

1095

1465

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;

1466

1108

goto end;

1467

1109

}

1468

1110

1492

1134

goto end;

1493

1135

}

1494

1136

1495

if(quit_now){

1496

goto end;

1497

}

1498

1499

1137

/* Create the Avahi service browser */

1500

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1502

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1503

1141

if(sb == NULL){

1504

1142

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

1505

1143

avahi_strerror(avahi_server_errno(mc.server)));

1507

1145

goto end;

1508

1146

}

1509

1147

1510

if(quit_now){

1511

goto end;

1512

}

1513

1514

1148

/* Run the main loop */

1515

1149

1516

1150

if(debug){

1545

1179

gpgme_release(mc.ctx);

1546

1180

}

1547

1181

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1580

1182

/* Removes the temp directory used by GPGME */

1581

1183

if(tempdir_created){

1582

1184

DIR *d;

1621

1223

}

1622

1224

}

1623

1225

1624

if(quit_now){

1625

sigemptyset(&old_sigterm_action.sa_mask);

1626

old_sigterm_action.sa_handler = SIG_DFL;

1627

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1628

&old_sigterm_action,

1629

NULL));

1630

if(ret == -1){

1631

perror("sigaction");

1632

}

1633

do {

1634

ret = raise(signal_received);

1635

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

1636

if(ret != 0){

1637

perror("raise");

1638

abort();

1639

}

1640

TEMP_FAILURE_RETRY(pause());

1641

}

1642

1643

1226

return exitcode;

1644

1227

}