/mandos/trunk : revision 423

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 */

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45

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

43

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

44

srand() */

46

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

47

strtof(), abort() */

45

48

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

46

49

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

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50

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

56

59

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

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60

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

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61

*/

59

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

62

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

63

strtoimax() */

60

64

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

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65

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

62

66

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

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71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

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 */

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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

117

127

static const char mandos_protocol_version[] = "1";

118

128

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

119

129

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;

120

132

121

133

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

122

134

typedef struct {

129

141

gpgme_ctx_t ctx;

130

142

} mandos_context;

131

143

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

132

152

/*

133

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

134

* "buffer_capacity" is how much is currently allocated,

153

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

154

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

135

155

* "buffer_length" is how much is already used.

136

156

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

157

size_t incbuffer(char **buffer, size_t buffer_length,

138

158

size_t buffer_capacity){

139

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

160

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

149

169

/*

150

170

* Initialize GPGME.

151

171

*/

152

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

172

static bool init_gpgme(const char *seckey,

153

173

const char *pubkey, const char *tempdir){

154

int ret;

155

174

gpgme_error_t rc;

156

175

gpgme_engine_info_t engine_info;

157

176

160

179

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

161

180

*/

162

181

bool import_key(const char *filename){

182

int ret;

163

183

int fd;

164

184

gpgme_data_t pgp_data;

165

185

176

196

return false;

177

197

}

178

198

179

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

199

rc = gpgme_op_import(mc.ctx, pgp_data);

180

200

if(rc != GPG_ERR_NO_ERROR){

181

201

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

182

202

gpgme_strsource(rc), gpgme_strerror(rc));

192

212

}

193

213

194

214

if(debug){

195

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

215

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

196

216

}

197

217

198

218

/* Init GPGME */

225

245

}

226

246

227

247

/* Create new GPGME "context" */

228

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

248

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

229

249

if(rc != GPG_ERR_NO_ERROR){

230

250

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

231

251

gpgme_strsource(rc), gpgme_strerror(rc));

236

256

return false;

237

257

}

238

258

239

return true;

259

return true;

240

260

}

241

261

242

262

/*

243

263

* Decrypt OpenPGP data.

244

264

* Returns -1 on error

245

265

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

267

size_t crypto_size,

249

268

char **plaintext){

250

269

gpgme_data_t dh_crypto, dh_plain;

277

296

278

297

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

279

298

data buffer */

280

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

299

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

281

300

if(rc != GPG_ERR_NO_ERROR){

282

301

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

283

302

gpgme_strsource(rc), gpgme_strerror(rc));

284

303

plaintext_length = -1;

285

304

if(debug){

286

305

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

288

307

if(result == NULL){

289

308

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

290

309

} else {

297

316

}

298

317

gpgme_recipient_t recipient;

299

318

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

}

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;

310

327

}

311

328

}

312

329

}

326

343

327

344

*plaintext = NULL;

328

345

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

346

plaintext_capacity = incbuffer(plaintext,

330

347

(size_t)plaintext_length,

331

348

plaintext_capacity);

332

349

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

350

perror("incbuffer");

334

351

plaintext_length = -1;

335

352

goto decrypt_end;

336

353

}

382

399

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

383

400

}

384

401

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

402

static int init_gnutls_global(const char *pubkeyfilename,

387

403

const char *seckeyfilename){

388

404

int ret;

389

405

407

423

}

408

424

409

425

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

411

427

if(ret != GNUTLS_E_SUCCESS){

412

428

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

413

429

from

425

441

}

426

442

427

443

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

429

445

GNUTLS_OPENPGP_FMT_BASE64);

430

446

if(ret != GNUTLS_E_SUCCESS){

431

447

fprintf(stderr,

437

453

}

438

454

439

455

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

456

ret = gnutls_dh_params_init(&mc.dh_params);

441

457

if(ret != GNUTLS_E_SUCCESS){

442

458

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

443

459

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

444

460

goto globalfail;

445

461

}

446

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

462

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

447

463

if(ret != GNUTLS_E_SUCCESS){

448

464

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

449

465

safer_gnutls_strerror(ret));

450

466

goto globalfail;

451

467

}

452

468

453

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

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

470

455

471

return 0;

456

472

457

473

globalfail:

458

474

459

gnutls_certificate_free_credentials(mc->cred);

475

gnutls_certificate_free_credentials(mc.cred);

460

476

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

477

gnutls_dh_params_deinit(mc.dh_params);

462

478

return -1;

463

479

}

464

480

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

481

static int init_gnutls_session(gnutls_session_t *session){

467

482

int ret;

468

483

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

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);

470

490

if(ret != GNUTLS_E_SUCCESS){

471

491

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

472

492

safer_gnutls_strerror(ret));

474

494

475

495

{

476

496

const char *err;

477

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

478

504

if(ret != GNUTLS_E_SUCCESS){

479

505

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

480

506

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

484

510

}

485

511

}

486

512

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

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);

489

521

if(ret != GNUTLS_E_SUCCESS){

490

522

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

491

523

safer_gnutls_strerror(ret));

494

526

}

495

527

496

528

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

530

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

532

502

533

return 0;

503

534

}

509

540

/* Called when a Mandos server is found */

510

541

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

511

542

AvahiIfIndex if_index,

512

mandos_context *mc, int af){

513

int ret, tcp_sd;

543

int af){

544

int ret, tcp_sd = -1;

514

545

ssize_t sret;

515

546

union {

516

547

struct sockaddr_in in;

517

548

struct sockaddr_in6 in6;

518

549

} to;

519

550

char *buffer = NULL;

520

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

521

552

size_t buffer_length = 0;

522

553

size_t buffer_capacity = 0;

523

ssize_t decrypted_buffer_size;

524

554

size_t written;

525

int retval = 0;

555

int retval = -1;

526

556

gnutls_session_t session;

527

557

int pf; /* Protocol family */

528

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

529

566

switch(af){

530

567

case AF_INET6:

531

568

pf = PF_INET6;

535

572

break;

536

573

default:

537

574

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

575

errno = EINVAL;

538

576

return -1;

539

577

}

540

578

541

ret = init_gnutls_session(mc, &session);

579

ret = init_gnutls_session(&session);

542

580

if(ret != 0){

543

581

return -1;

544

582

}

550

588

551

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

552

590

if(tcp_sd < 0){

591

int e = errno;

553

592

perror("socket");

554

return -1;

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

555

600

}

556

601

557

602

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

558

603

if(af == AF_INET6){

559

to.in6.sin6_family = (uint16_t)af;

604

to.in6.sin6_family = (sa_family_t)af;

560

605

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

561

606

} else { /* IPv4 */

562

607

to.in.sin_family = (sa_family_t)af;

563

608

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

564

609

}

565

610

if(ret < 0 ){

611

int e = errno;

566

612

perror("inet_pton");

567

return -1;

613

errno = e;

614

goto mandos_end;

568

615

}

569

616

if(ret == 0){

617

int e = errno;

570

618

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

571

return -1;

619

errno = e;

620

goto mandos_end;

572

621

}

573

622

if(af == AF_INET6){

574

623

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

581

630

if(if_index == AVAHI_IF_UNSPEC){

582

631

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

583

632

" without a network interface\n");

584

return -1;

633

errno = EINVAL;

634

goto mandos_end;

585

635

}

586

636

/* Set the network interface number as scope */

587

637

to.in6.sin6_scope_id = (uint32_t)if_index;

592

642

-Wunreachable-code */

593

643

}

594

644

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

595

650

if(debug){

596

651

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

597

652

char interface[IF_NAMESIZE];

624

679

}

625

680

}

626

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

627

687

if(af == AF_INET6){

628

688

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

629

689

} else {

630

690

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

631

691

}

632

692

if(ret < 0){

693

int e = errno;

633

694

perror("connect");

634

return -1;

695

errno = e;

696

goto mandos_end;

697

}

698

699

if(quit_now){

700

errno = EINTR;

701

goto mandos_end;

635

702

}

636

703

637

704

const char *out = mandos_protocol_version;

641

708

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

642

709

out_size - written));

643

710

if(ret == -1){

711

int e = errno;

644

712

perror("write");

645

retval = -1;

713

errno = e;

646

714

goto mandos_end;

647

715

}

648

716

written += (size_t)ret;

656

724

break;

657

725

}

658

726

}

727

728

if(quit_now){

729

errno = EINTR;

730

goto mandos_end;

731

}

659

732

}

660

733

661

734

if(debug){

662

735

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

663

736

}

664

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

665

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

666

744

667

do{

745

if(quit_now){

746

errno = EINTR;

747

goto mandos_end;

748

}

749

750

do {

668

751

ret = gnutls_handshake(session);

752

if(quit_now){

753

errno = EINTR;

754

goto mandos_end;

755

}

669

756

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

670

757

671

758

if(ret != GNUTLS_E_SUCCESS){

673

760

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

674

761

gnutls_perror(ret);

675

762

}

676

retval = -1;

763

errno = EPROTO;

677

764

goto mandos_end;

678

765

}

679

766

685

772

}

686

773

687

774

while(true){

688

buffer_capacity = adjustbuffer(&buffer, buffer_length,

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

779

}

780

781

buffer_capacity = incbuffer(&buffer, buffer_length,

689

782

buffer_capacity);

690

783

if(buffer_capacity == 0){

691

perror("adjustbuffer");

692

retval = -1;

784

int e = errno;

785

perror("incbuffer");

786

errno = e;

787

goto mandos_end;

788

}

789

790

if(quit_now){

791

errno = EINTR;

693

792

goto mandos_end;

694

793

}

695

794

704

803

case GNUTLS_E_AGAIN:

705

804

break;

706

805

case GNUTLS_E_REHANDSHAKE:

707

do{

806

do {

708

807

ret = gnutls_handshake(session);

808

809

if(quit_now){

810

errno = EINTR;

811

goto mandos_end;

812

}

709

813

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

710

814

if(ret < 0){

711

815

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

712

816

gnutls_perror(ret);

713

retval = -1;

817

errno = EPROTO;

714

818

goto mandos_end;

715

819

}

716

820

break;

717

821

default:

718

822

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

719

823

" encrypted session with Mandos server\n");

720

retval = -1;

721

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

722

826

goto mandos_end;

723

827

}

724

828

} else {

730

834

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

731

835

}

732

836

733

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

734

849

735

850

if(buffer_length > 0){

736

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

851

ssize_t decrypted_buffer_size;

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

737

853

buffer_length,

738

854

&decrypted_buffer);

739

855

if(decrypted_buffer_size >= 0){

856

740

857

written = 0;

741

858

while(written < (size_t) decrypted_buffer_size){

859

if(quit_now){

860

errno = EINTR;

861

goto mandos_end;

862

}

863

742

864

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

743

865

(size_t)decrypted_buffer_size - written,

744

866

stdout);

745

867

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

868

int e = errno;

746

869

if(debug){

747

870

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

748

871

strerror(errno));

749

872

}

750

retval = -1;

751

break;

873

errno = e;

874

goto mandos_end;

752

875

}

753

876

written += (size_t)ret;

754

877

}

755

free(decrypted_buffer);

756

} else {

757

retval = -1;

878

retval = 0;

758

879

}

759

} else {

760

retval = -1;

761

880

}

762

881

763

882

/* Shutdown procedure */

764

883

765

884

mandos_end:

766

free(buffer);

767

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

768

if(ret == -1){

769

perror("close");

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;

770

904

}

771

gnutls_deinit(session);

772

905

return retval;

773

906

}

774

907

785

918

AVAHI_GCC_UNUSED AvahiStringList *txt,

786

919

AVAHI_GCC_UNUSED AvahiLookupResultFlags

787

920

flags,

788

void* userdata){

789

mandos_context *mc = userdata;

921

AVAHI_GCC_UNUSED void* userdata){

790

922

assert(r);

791

923

792

924

/* Called whenever a service has been resolved successfully or

793

925

timed out */

794

926

927

if(quit_now){

928

return;

929

}

930

795

931

switch(event){

796

932

default:

797

933

case AVAHI_RESOLVER_FAILURE:

798

934

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

799

935

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

800

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

936

avahi_strerror(avahi_server_errno(mc.server)));

801

937

break;

802

938

803

939

case AVAHI_RESOLVER_FOUND:

809

945

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

810

946

ip, (intmax_t)interface, port);

811

947

}

812

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

948

int ret = start_mandos_communication(ip, port, interface,

813

949

avahi_proto_to_af(proto));

814

950

if(ret == 0){

815

avahi_simple_poll_quit(mc->simple_poll);

951

avahi_simple_poll_quit(mc.simple_poll);

816

952

}

817

953

}

818

954

}

828

964

const char *domain,

829

965

AVAHI_GCC_UNUSED AvahiLookupResultFlags

830

966

flags,

831

void* userdata){

832

mandos_context *mc = userdata;

967

AVAHI_GCC_UNUSED void* userdata){

833

968

assert(b);

834

969

835

970

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

836

971

is removed from the LAN */

837

972

973

if(quit_now){

974

return;

975

}

976

838

977

switch(event){

839

978

default:

840

979

case AVAHI_BROWSER_FAILURE:

841

980

842

981

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

843

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

844

avahi_simple_poll_quit(mc->simple_poll);

982

avahi_strerror(avahi_server_errno(mc.server)));

983

avahi_simple_poll_quit(mc.simple_poll);

845

984

return;

846

985

847

986

case AVAHI_BROWSER_NEW:

850

989

the callback function is called the Avahi server will free the

851

990

resolver for us. */

852

991

853

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

854

protocol, name, type, domain,

855

AVAHI_PROTO_INET6, 0,

856

resolve_callback, mc)))

992

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

993

name, type, domain, protocol, 0,

994

resolve_callback, NULL) == NULL)

857

995

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

858

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

996

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

859

997

break;

860

998

861

999

case AVAHI_BROWSER_REMOVE:

870

1008

}

871

1009

}

872

1010

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

873

1120

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

874

1121

AvahiSServiceBrowser *sb = NULL;

875

1122

int error;

876

1123

int ret;

877

1124

intmax_t tmpmax;

878

int numchars;

1125

char *tmp;

879

1126

int exitcode = EXIT_SUCCESS;

880

const char *interface = "eth0";

1127

const char *interface = "";

881

1128

struct ifreq network;

882

int sd;

1129

int sd = -1;

1130

bool take_down_interface = false;

883

1131

uid_t uid;

884

1132

gid_t gid;

885

char *connect_to = NULL;

886

1133

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

887

1134

bool tempdir_created = false;

888

1135

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

889

1136

const char *seckey = PATHDIR "/" SECKEY;

890

1137

const char *pubkey = PATHDIR "/" PUBKEY;

891

1138

892

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

893

.dh_bits = 1024, .priority = "SECURE256"

894

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

895

1139

bool gnutls_initialized = false;

896

1140

bool gpgme_initialized = false;

897

double delay = 2.5;

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

}

898

1166

899

1167

{

900

1168

struct argp_option options[] = {

930

1198

.arg = "SECONDS",

931

1199

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

932

1200

.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 },

933

1210

{ .name = NULL }

934

1211

};

935

1212

936

1213

error_t parse_opt(int key, char *arg,

937

1214

struct argp_state *state){

1215

errno = 0;

938

1216

switch(key){

939

1217

case 128: /* --debug */

940

1218

debug = true;

952

1230

pubkey = arg;

953

1231

break;

954

1232

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

955

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

956

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

957

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

958

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

959

exit(EXIT_FAILURE);

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");

960

1238

}

961

1239

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

962

1240

break;

964

1242

mc.priority = arg;

965

1243

break;

966

1244

case 131: /* --delay */

967

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

968

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

969

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

970

exit(EXIT_FAILURE);

1245

errno = 0;

1246

delay = strtof(arg, &tmp);

1247

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

1248

argp_error(state, "Bad delay");

971

1249

}

972

1250

break;

973

case ARGP_KEY_ARG:

974

argp_usage(state);

975

case ARGP_KEY_END:

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);

976

1264

break;

977

1265

default:

978

1266

return ARGP_ERR_UNKNOWN;

979

1267

}

980

return 0;

1268

return errno;

981

1269

}

982

1270

983

1271

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

984

1272

.args_doc = "",

985

1273

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

986

1274

" passwords from a Mandos server" };

987

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

988

if(ret == ARGP_ERR_UNKNOWN){

989

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

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");

990

1316

exitcode = EXIT_FAILURE;

991

1317

goto end;

992

1318

}

993

1319

}

994

1320

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

995

1395

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

996

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

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

997

1415

#ifdef __linux__

998

1416

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

999

messages to mess up the prompt */

1417

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

1000

1418

ret = klogctl(8, NULL, 5);

1001

1419

bool restore_loglevel = true;

1002

1420

if(ret == -1){

1003

1421

restore_loglevel = false;

1004

1422

perror("klogctl");

1005

1423

}

1006

#endif

1424

#endif /* __linux__ */

1007

1425

1008

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1009

1427

if(sd < 0){

1010

1428

perror("socket");

1011

exitcode = EXIT_FAILURE;

1429

exitcode = EX_OSERR;

1012

1430

#ifdef __linux__

1013

1431

if(restore_loglevel){

1014

1432

ret = klogctl(7, NULL, 0);

1016

1434

perror("klogctl");

1017

1435

}

1018

1436

}

1019

#endif

1437

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

1441

if(ret == -1){

1442

perror("seteuid");

1443

}

1020

1444

goto end;

1021

1445

}

1022

1446

strcpy(network.ifr_name, interface);

1030

1454

perror("klogctl");

1031

1455

}

1032

1456

}

1033

#endif

1034

exitcode = EXIT_FAILURE;

1457

#endif /* __linux__ */

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

1462

if(ret == -1){

1463

perror("seteuid");

1464

}

1035

1465

goto end;

1036

1466

}

1037

1467

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

1038

1468

network.ifr_flags |= IFF_UP;

1469

take_down_interface = true;

1039

1470

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

1040

1471

if(ret == -1){

1041

perror("ioctl SIOCSIFFLAGS");

1042

exitcode = EXIT_FAILURE;

1472

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

1043

1475

#ifdef __linux__

1044

1476

if(restore_loglevel){

1045

1477

ret = klogctl(7, NULL, 0);

1047

1479

perror("klogctl");

1048

1480

}

1049

1481

}

1050

#endif

1482

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1051

1489

goto end;

1052

1490

}

1053

1491

}

1065

1503

perror("nanosleep");

1066

1504

}

1067

1505

}

1068

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

1069

if(ret == -1){

1070

perror("close");

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

}

1071

1512

}

1072

1513

#ifdef __linux__

1073

1514

if(restore_loglevel){

1077

1518

perror("klogctl");

1078

1519

}

1079

1520

}

1080

#endif

1081

}

1082

1083

uid = getuid();

1084

gid = getgid();

1085

1086

errno = 0;

1087

setgid(gid);

1088

if(ret == -1){

1089

perror("setgid");

1090

}

1091

1092

ret = setuid(uid);

1093

if(ret == -1){

1094

perror("setuid");

1095

}

1096

1097

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

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);

1098

1544

if(ret == -1){

1099

1545

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

1100

exitcode = EXIT_FAILURE;

1546

exitcode = EX_UNAVAILABLE;

1101

1547

goto end;

1102

1548

} else {

1103

1549

gnutls_initialized = true;

1104

1550

}

1105

1551

1552

if(quit_now){

1553

goto end;

1554

}

1555

1556

tempdir_created = true;

1106

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1107

1559

perror("mkdtemp");

1108

1560

goto end;

1109

1561

}

1110

tempdir_created = true;

1111

1112

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

1562

1563

if(quit_now){

1564

goto end;

1565

}

1566

1567

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

1113

1568

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

1114

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1115

1570

goto end;

1116

1571

} else {

1117

1572

gpgme_initialized = true;

1118

1573

}

1119

1574

1120

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

1121

if_index = (AvahiIfIndex) if_nametoindex(interface);

1122

if(if_index == 0){

1123

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

1124

exitcode = EXIT_FAILURE;

1125

goto end;

1126

}

1575

if(quit_now){

1576

goto end;

1127

1577

}

1128

1578

1129

1579

if(connect_to != NULL){

1132

1582

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

1133

1583

if(address == NULL){

1134

1584

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

1135

exitcode = EXIT_FAILURE;

1136

goto end;

1137

}

1585

exitcode = EX_USAGE;

1586

goto end;

1587

}

1588

1589

if(quit_now){

1590

goto end;

1591

}

1592

1138

1593

uint16_t port;

1139

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

1140

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

1141

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

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){

1142

1598

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

1143

exitcode = EXIT_FAILURE;

1144

goto end;

1145

}

1599

exitcode = EX_USAGE;

1600

goto end;

1601

}

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1146

1607

port = (uint16_t)tmpmax;

1147

1608

*address = '\0';

1148

1609

address = connect_to;

1153

1614

} else {

1154

1615

af = AF_INET;

1155

1616

}

1156

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

1157

af);

1617

1618

if(quit_now){

1619

goto end;

1620

}

1621

1622

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

1158

1623

if(ret < 0){

1159

exitcode = EXIT_FAILURE;

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

}

1160

1643

} else {

1161

1644

exitcode = EXIT_SUCCESS;

1162

1645

}

1163

1646

goto end;

1164

1647

}

1165

1648

1166

if(not debug){

1167

avahi_set_log_function(empty_log);

1168

}

1169

1170

/* Initialize the pseudo-RNG for Avahi */

1171

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

1172

1173

/* Allocate main Avahi loop object */

1174

mc.simple_poll = avahi_simple_poll_new();

1175

if(mc.simple_poll == NULL){

1176

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

1177

exitcode = EXIT_FAILURE;

1649

if(quit_now){

1178

1650

goto end;

1179

1651

}

1180

1652

1200

1672

if(mc.server == NULL){

1201

1673

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

1202

1674

avahi_strerror(error));

1203

exitcode = EXIT_FAILURE;

1675

exitcode = EX_UNAVAILABLE;

1676

goto end;

1677

}

1678

1679

if(quit_now){

1204

1680

goto end;

1205

1681

}

1206

1682

1207

1683

/* Create the Avahi service browser */

1208

1684

sb = avahi_s_service_browser_new(mc.server, if_index,

1209

AVAHI_PROTO_INET6, "_mandos._tcp",

1210

NULL, 0, browse_callback, &mc);

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

NULL, 0, browse_callback, NULL);

1211

1687

if(sb == NULL){

1212

1688

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

1213

1689

avahi_strerror(avahi_server_errno(mc.server)));

1214

exitcode = EXIT_FAILURE;

1690

exitcode = EX_UNAVAILABLE;

1691

goto end;

1692

}

1693

1694

if(quit_now){

1215

1695

goto end;

1216

1696

}

1217

1697

1249

1729

gpgme_release(mc.ctx);

1250

1730

}

1251

1731

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

1252

1764

/* Removes the temp directory used by GPGME */

1253

1765

if(tempdir_created){

1254

1766

DIR *d;

1293

1805

}

1294

1806

}

1295

1807

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

1296

1827

return exitcode;

1297

1828

}