/mandos/trunk : revision 24.1.133

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

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*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

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() */

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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 */

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42

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

46

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

47

strtof(), abort() */

43

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

44

srand() */

48

45

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

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46

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

50

47

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

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56

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

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57

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

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58

*/

62

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

63

strtoimax() */

59

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

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60

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

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61

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

66

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

62

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

67

63

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

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64

SIOCSIFFLAGS, if_indextoname(),

69

65

if_nametoindex(), IF_NAMESIZE */

71

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

68

*/

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

73

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

78

74

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

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75

argp_state, struct argp,

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

88

78

#ifdef __linux__

89

79

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

90

#endif /* __linux__ */

80

#endif

91

81

92

82

/* Avahi */

93

83

/* All Avahi types, constants and functions

127

117

static const char mandos_protocol_version[] = "1";

128

118

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

129

119

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

130

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

131

char *connect_to = NULL;

132

120

133

121

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

134

122

typedef struct {

141

129

gpgme_ctx_t ctx;

142

130

} mandos_context;

143

131

144

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

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

146

.dh_bits = 1024, .priority = "SECURE256"

147

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

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

132

/*

153

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

154

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

155

* "buffer_length" is how much is already used.

133

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

134

* additional bytes. "buffer_capacity" is how much is currently

135

* allocated, "buffer_length" is how much is already used.

156

136

*/

157

137

size_t incbuffer(char **buffer, size_t buffer_length,

158

138

size_t buffer_capacity){

169

149

/*

170

150

* Initialize GPGME.

171

151

*/

172

static bool init_gpgme(const char *seckey,

152

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

173

153

const char *pubkey, const char *tempdir){

154

int ret;

174

155

gpgme_error_t rc;

175

156

gpgme_engine_info_t engine_info;

176

157

179

160

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

180

161

*/

181

162

bool import_key(const char *filename){

182

int ret;

183

163

int fd;

184

164

gpgme_data_t pgp_data;

185

165

196

176

return false;

197

177

}

198

178

199

rc = gpgme_op_import(mc.ctx, pgp_data);

179

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

200

180

if(rc != GPG_ERR_NO_ERROR){

201

181

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

202

182

gpgme_strsource(rc), gpgme_strerror(rc));

212

192

}

213

193

214

194

if(debug){

215

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

195

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

216

196

}

217

197

218

198

/* Init GPGME */

245

225

}

246

226

247

227

/* Create new GPGME "context" */

248

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

228

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

249

229

if(rc != GPG_ERR_NO_ERROR){

250

230

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

251

231

gpgme_strsource(rc), gpgme_strerror(rc));

256

236

return false;

257

237

}

258

238

259

return true;

239

return true;

260

240

}

261

241

262

242

/*

263

243

* Decrypt OpenPGP data.

264

244

* Returns -1 on error

265

245

*/

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

267

248

size_t crypto_size,

268

249

char **plaintext){

269

250

gpgme_data_t dh_crypto, dh_plain;

296

277

297

278

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

298

279

data buffer */

299

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

280

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

300

281

if(rc != GPG_ERR_NO_ERROR){

301

282

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

302

283

gpgme_strsource(rc), gpgme_strerror(rc));

303

284

plaintext_length = -1;

304

285

if(debug){

305

286

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

307

288

if(result == NULL){

308

289

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

309

290

} else {

316

297

}

317

298

gpgme_recipient_t recipient;

318

299

recipient = result->recipients;

319

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

300

if(recipient){

301

while(recipient != NULL){

302

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

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

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

305

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

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

327

310

}

328

311

}

329

312

}

399

382

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

400

383

}

401

384

402

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

403

387

const char *seckeyfilename){

404

388

int ret;

405

389

423

407

}

424

408

425

409

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

427

411

if(ret != GNUTLS_E_SUCCESS){

428

412

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

429

413

from

441

425

}

442

426

443

427

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

445

429

GNUTLS_OPENPGP_FMT_BASE64);

446

430

if(ret != GNUTLS_E_SUCCESS){

447

431

fprintf(stderr,

453

437

}

454

438

455

439

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

457

441

if(ret != GNUTLS_E_SUCCESS){

458

442

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

459

443

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

460

444

goto globalfail;

461

445

}

462

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

446

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

463

447

if(ret != GNUTLS_E_SUCCESS){

464

448

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

465

449

safer_gnutls_strerror(ret));

466

450

goto globalfail;

467

451

}

468

452

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

470

454

471

455

return 0;

472

456

473

457

globalfail:

474

458

475

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

476

460

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

478

462

return -1;

479

463

}

480

464

481

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

482

467

int ret;

483

468

/* GnuTLS session creation */

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

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

469

ret = gnutls_init(session, GNUTLS_SERVER);

490

470

if(ret != GNUTLS_E_SUCCESS){

491

471

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

492

472

safer_gnutls_strerror(ret));

494

474

495

475

{

496

476

const char *err;

497

do {

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

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

477

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

504

478

if(ret != GNUTLS_E_SUCCESS){

505

479

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

506

480

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

510

484

}

511

485

}

512

486

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

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

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

521

489

if(ret != GNUTLS_E_SUCCESS){

522

490

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

523

491

safer_gnutls_strerror(ret));

526

494

}

527

495

528

496

/* ignore client certificate if any. */

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

530

499

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

532

501

533

502

return 0;

534

503

}

540

509

/* Called when a Mandos server is found */

541

510

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

542

511

AvahiIfIndex if_index,

543

int af){

544

int ret, tcp_sd = -1;

512

mandos_context *mc, int af){

513

int ret, tcp_sd;

545

514

ssize_t sret;

546

515

union {

547

516

struct sockaddr_in in;

548

517

struct sockaddr_in6 in6;

549

518

} to;

550

519

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

520

char *decrypted_buffer;

552

521

size_t buffer_length = 0;

553

522

size_t buffer_capacity = 0;

523

ssize_t decrypted_buffer_size;

554

524

size_t written;

555

int retval = -1;

525

int retval = 0;

556

526

gnutls_session_t session;

557

527

int pf; /* Protocol family */

558

528

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

566

529

switch(af){

567

530

case AF_INET6:

568

531

pf = PF_INET6;

572

535

break;

573

536

default:

574

537

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

575

errno = EINVAL;

576

538

return -1;

577

539

}

578

540

579

ret = init_gnutls_session(&session);

541

ret = init_gnutls_session(mc, &session);

580

542

if(ret != 0){

581

543

return -1;

582

544

}

588

550

589

551

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

552

if(tcp_sd < 0){

591

int e = errno;

592

553

perror("socket");

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

554

return -1;

600

555

}

601

556

602

557

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

603

558

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

559

to.in6.sin6_family = (uint16_t)af;

605

560

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

606

561

} else { /* IPv4 */

607

562

to.in.sin_family = (sa_family_t)af;

608

563

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

609

564

}

610

565

if(ret < 0 ){

611

int e = errno;

612

566

perror("inet_pton");

613

errno = e;

614

goto mandos_end;

567

return -1;

615

568

}

616

569

if(ret == 0){

617

int e = errno;

618

570

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

619

errno = e;

620

goto mandos_end;

571

return -1;

621

572

}

622

573

if(af == AF_INET6){

623

574

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

630

581

if(if_index == AVAHI_IF_UNSPEC){

631

582

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

632

583

" without a network interface\n");

633

errno = EINVAL;

634

goto mandos_end;

584

return -1;

635

585

}

636

586

/* Set the network interface number as scope */

637

587

to.in6.sin6_scope_id = (uint32_t)if_index;

642

592

-Wunreachable-code */

643

593

}

644

594

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

650

595

if(debug){

651

596

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

652

597

char interface[IF_NAMESIZE];

679

624

}

680

625

}

681

626

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

627

if(af == AF_INET6){

688

628

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

689

629

} else {

690

630

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

691

631

}

692

632

if(ret < 0){

693

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

633

perror("connect");

634

return -1;

704

635

}

705

636

706

637

const char *out = mandos_protocol_version;

710

641

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

711

642

out_size - written));

712

643

if(ret == -1){

713

int e = errno;

714

644

perror("write");

715

errno = e;

645

retval = -1;

716

646

goto mandos_end;

717

647

}

718

648

written += (size_t)ret;

726

656

break;

727

657

}

728

658

}

729

730

if(quit_now){

731

errno = EINTR;

732

goto mandos_end;

733

}

734

659

}

735

660

736

661

if(debug){

737

662

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

738

663

}

739

664

740

if(quit_now){

741

errno = EINTR;

742

goto mandos_end;

743

}

744

745

665

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

666

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

752

do {

667

do{

753

668

ret = gnutls_handshake(session);

754

if(quit_now){

755

errno = EINTR;

756

goto mandos_end;

757

}

758

669

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

759

670

760

671

if(ret != GNUTLS_E_SUCCESS){

762

673

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

763

674

gnutls_perror(ret);

764

675

}

765

errno = EPROTO;

676

retval = -1;

766

677

goto mandos_end;

767

678

}

768

679

774

685

}

775

686

776

687

while(true){

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

781

}

782

783

688

buffer_capacity = incbuffer(&buffer, buffer_length,

784

689

buffer_capacity);

785

690

if(buffer_capacity == 0){

786

int e = errno;

787

691

perror("incbuffer");

788

errno = e;

789

goto mandos_end;

790

}

791

792

if(quit_now){

793

errno = EINTR;

692

retval = -1;

794

693

goto mandos_end;

795

694

}

796

695

805

704

case GNUTLS_E_AGAIN:

806

705

break;

807

706

case GNUTLS_E_REHANDSHAKE:

808

do {

707

do{

809

708

ret = gnutls_handshake(session);

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

815

709

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

816

710

if(ret < 0){

817

711

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

818

712

gnutls_perror(ret);

819

errno = EPROTO;

713

retval = -1;

820

714

goto mandos_end;

821

715

}

822

716

break;

823

717

default:

824

718

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

825

719

" encrypted session with Mandos server\n");

720

retval = -1;

826

721

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

722

goto mandos_end;

829

723

}

830

724

} else {

836

730

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

837

731

}

838

732

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

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

733

gnutls_bye(session, GNUTLS_SHUT_RDWR);

851

734

852

735

if(buffer_length > 0){

853

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

736

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

855

737

buffer_length,

856

738

&decrypted_buffer);

857

739

if(decrypted_buffer_size >= 0){

858

859

740

written = 0;

860

741

while(written < (size_t) decrypted_buffer_size){

861

if(quit_now){

862

errno = EINTR;

863

goto mandos_end;

864

}

865

866

742

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

867

743

(size_t)decrypted_buffer_size - written,

868

744

stdout);

869

745

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

870

int e = errno;

871

746

if(debug){

872

747

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

873

748

strerror(errno));

874

749

}

875

errno = e;

876

goto mandos_end;

750

retval = -1;

751

break;

877

752

}

878

753

written += (size_t)ret;

879

754

}

880

retval = 0;

755

free(decrypted_buffer);

756

} else {

757

retval = -1;

881

758

}

759

} else {

760

retval = -1;

882

761

}

883

762

884

763

/* Shutdown procedure */

885

764

886

765

mandos_end:

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

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

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

766

free(buffer);

767

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

768

if(ret == -1){

769

perror("close");

906

770

}

771

gnutls_deinit(session);

907

772

return retval;

908

773

}

909

774

920

785

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

786

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

787

flags,

923

AVAHI_GCC_UNUSED void* userdata){

788

void* userdata){

789

mandos_context *mc = userdata;

924

790

assert(r);

925

791

926

792

/* Called whenever a service has been resolved successfully or

927

793

timed out */

928

794

929

if(quit_now){

930

return;

931

}

932

933

795

switch(event){

934

796

default:

935

797

case AVAHI_RESOLVER_FAILURE:

936

798

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

937

799

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

938

avahi_strerror(avahi_server_errno(mc.server)));

800

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

939

801

break;

940

802

941

803

case AVAHI_RESOLVER_FOUND:

947

809

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

948

810

ip, (intmax_t)interface, port);

949

811

}

950

int ret = start_mandos_communication(ip, port, interface,

812

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

951

813

avahi_proto_to_af(proto));

952

814

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

815

avahi_simple_poll_quit(mc->simple_poll);

954

816

}

955

817

}

956

818

}

966

828

const char *domain,

967

829

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

830

flags,

969

AVAHI_GCC_UNUSED void* userdata){

831

void* userdata){

832

mandos_context *mc = userdata;

970

833

assert(b);

971

834

972

835

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

973

836

is removed from the LAN */

974

837

975

if(quit_now){

976

return;

977

}

978

979

838

switch(event){

980

839

default:

981

840

case AVAHI_BROWSER_FAILURE:

982

841

983

842

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

843

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

844

avahi_simple_poll_quit(mc->simple_poll);

986

845

return;

987

846

988

847

case AVAHI_BROWSER_NEW:

991

850

the callback function is called the Avahi server will free the

992

851

resolver for us. */

993

852

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

853

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

854

protocol, name, type, domain,

855

AVAHI_PROTO_INET6, 0,

856

resolve_callback, mc)))

997

857

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

998

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

858

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

999

859

break;

1000

860

1001

861

case AVAHI_BROWSER_REMOVE:

1010

870

}

1011

871

}

1012

872

1013

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

1014

static void handle_sigterm(int sig){

1015

if(quit_now){

1016

return;

1017

}

1018

quit_now = 1;

1019

signal_received = sig;

1020

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1023

}

1024

errno = old_errno;

1025

}

1026

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

1122

873

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

1123

874

AvahiSServiceBrowser *sb = NULL;

1124

875

int error;

1125

876

int ret;

1126

877

intmax_t tmpmax;

1127

char *tmp;

878

int numchars;

1128

879

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

880

const char *interface = "eth0";

1130

881

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

882

int sd;

1133

883

uid_t uid;

1134

884

gid_t gid;

885

char *connect_to = NULL;

1135

886

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

1136

887

bool tempdir_created = false;

1137

888

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

889

const char *seckey = PATHDIR "/" SECKEY;

1139

890

const char *pubkey = PATHDIR "/" PUBKEY;

1140

891

892

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

893

.dh_bits = 1024, .priority = "SECURE256"

894

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

1141

895

bool gnutls_initialized = false;

1142

896

bool gpgme_initialized = false;

1143

float delay = 2.5f;

1144

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

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

1152

errno = 0;

1153

ret = setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

/* Lower user privileges (temporarily) */

1159

errno = 0;

1160

ret = seteuid(uid);

1161

if(ret == -1){

1162

perror("seteuid");

1163

}

1164

1165

if(quit_now){

1166

goto end;

1167

}

897

double delay = 2.5;

1168

898

1169

899

{

1170

900

struct argp_option options[] = {

1200

930

.arg = "SECONDS",

1201

931

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

1202

932

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

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

1207

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

1208

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

1209

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

1210

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

1211

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

1212

933

{ .name = NULL }

1213

934

};

1214

935

1215

936

error_t parse_opt(int key, char *arg,

1216

937

struct argp_state *state){

1217

errno = 0;

1218

938

switch(key){

1219

939

case 128: /* --debug */

1220

940

debug = true;

1232

952

pubkey = arg;

1233

953

break;

1234

954

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

1235

errno = 0;

1236

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

1237

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

1238

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

1239

argp_error(state, "Bad number of 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);

1240

960

}

1241

961

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

1242

962

break;

1244

964

mc.priority = arg;

1245

965

break;

1246

966

case 131: /* --delay */

1247

errno = 0;

1248

delay = strtof(arg, &tmp);

1249

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

1250

argp_error(state, "Bad 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);

1251

971

}

1252

972

break;

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

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

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

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

1264

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

1265

exit(argp_err_exit_status);

973

case ARGP_KEY_ARG:

974

argp_usage(state);

975

case ARGP_KEY_END:

1266

976

break;

1267

977

default:

1268

978

return ARGP_ERR_UNKNOWN;

1269

979

}

1270

return errno;

980

return 0;

1271

981

}

1272

982

1273

983

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

1274

984

.args_doc = "",

1275

985

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

1276

986

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

exitcode = EX_USAGE;

1290

goto end;

1291

}

1292

}

1293

1294

if(not debug){

1295

avahi_set_log_function(empty_log);

1296

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

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");

1318

990

exitcode = EXIT_FAILURE;

1319

991

goto end;

1320

992

}

1321

993

}

1322

994

1323

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

1324

from the signal handler */

1325

/* Initialize the pseudo-RNG for Avahi */

1326

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

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

1330

exitcode = EX_UNAVAILABLE;

1331

goto end;

1332

}

1333

1334

sigemptyset(&sigterm_action.sa_mask);

1335

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

1336

if(ret == -1){

1337

perror("sigaddset");

1338

exitcode = EX_OSERR;

1339

goto end;

1340

}

1341

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

1342

if(ret == -1){

1343

perror("sigaddset");

1344

exitcode = EX_OSERR;

1345

goto end;

1346

}

1347

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

1348

if(ret == -1){

1349

perror("sigaddset");

1350

exitcode = EX_OSERR;

1351

goto end;

1352

}

1353

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

1354

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

1355

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

1356

*/

1357

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

1358

if(ret == -1){

1359

perror("sigaction");

1360

return EX_OSERR;

1361

}

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

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

1364

if(ret == -1){

1365

perror("sigaction");

1366

exitcode = EX_OSERR;

1367

goto end;

1368

}

1369

}

1370

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

1371

if(ret == -1){

1372

perror("sigaction");

1373

return EX_OSERR;

1374

}

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

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

1377

if(ret == -1){

1378

perror("sigaction");

1379

exitcode = EX_OSERR;

1380

goto end;

1381

}

1382

}

1383

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

1384

if(ret == -1){

1385

perror("sigaction");

1386

return EX_OSERR;

1387

}

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

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

1390

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

1397

995

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

996

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

1417

997

#ifdef __linux__

1418

998

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

999

messages to mess up the prompt */

1420

1000

ret = klogctl(8, NULL, 5);

1421

1001

bool restore_loglevel = true;

1422

1002

if(ret == -1){

1423

1003

restore_loglevel = false;

1424

1004

perror("klogctl");

1425

1005

}

1426

#endif /* __linux__ */

1006

#endif

1427

1007

1428

1008

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1009

if(sd < 0){

1430

1010

perror("socket");

1431

exitcode = EX_OSERR;

1011

exitcode = EXIT_FAILURE;

1432

1012

#ifdef __linux__

1433

1013

if(restore_loglevel){

1434

1014

ret = klogctl(7, NULL, 0);

1436

1016

perror("klogctl");

1437

1017

}

1438

1018

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1019

#endif

1446

1020

goto end;

1447

1021

}

1448

1022

strcpy(network.ifr_name, interface);

1456

1030

perror("klogctl");

1457

1031

}

1458

1032

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1033

#endif

1034

exitcode = EXIT_FAILURE;

1467

1035

goto end;

1468

1036

}

1469

1037

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

1470

1038

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

1039

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

1473

1040

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1041

perror("ioctl SIOCSIFFLAGS");

1042

exitcode = EXIT_FAILURE;

1477

1043

#ifdef __linux__

1478

1044

if(restore_loglevel){

1479

1045

ret = klogctl(7, NULL, 0);

1481

1047

perror("klogctl");

1482

1048

}

1483

1049

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1050

#endif

1491

1051

goto end;

1492

1052

}

1493

1053

}

1505

1065

perror("nanosleep");

1506

1066

}

1507

1067

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1068

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

1069

if(ret == -1){

1070

perror("close");

1514

1071

}

1515

1072

#ifdef __linux__

1516

1073

if(restore_loglevel){

1520

1077

perror("klogctl");

1521

1078

}

1522

1079

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

1539

}

1540

1541

if(quit_now){

1542

goto end;

1543

}

1544

1545

ret = init_gnutls_global(pubkey, seckey);

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);

1546

1098

if(ret == -1){

1547

1099

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

1548

exitcode = EX_UNAVAILABLE;

1100

exitcode = EXIT_FAILURE;

1549

1101

goto end;

1550

1102

} else {

1551

1103

gnutls_initialized = true;

1552

1104

}

1553

1105

1554

if(quit_now){

1555

goto end;

1556

}

1557

1558

tempdir_created = true;

1559

1106

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

1107

perror("mkdtemp");

1562

1108

goto end;

1563

1109

}

1564

1565

if(quit_now){

1566

goto end;

1567

}

1568

1569

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

1110

tempdir_created = true;

1111

1112

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

1570

1113

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

1571

exitcode = EX_UNAVAILABLE;

1114

exitcode = EXIT_FAILURE;

1572

1115

goto end;

1573

1116

} else {

1574

1117

gpgme_initialized = true;

1575

1118

}

1576

1119

1577

if(quit_now){

1578

goto end;

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

}

1579

1127

}

1580

1128

1581

1129

if(connect_to != NULL){

1584

1132

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

1585

1133

if(address == NULL){

1586

1134

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

1587

exitcode = EX_USAGE;

1588

goto end;

1589

}

1590

1591

if(quit_now){

1592

goto end;

1593

}

1594

1135

exitcode = EXIT_FAILURE;

1136

goto end;

1137

}

1595

1138

uint16_t port;

1596

errno = 0;

1597

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

1598

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

1599

or tmpmax != (uint16_t)tmpmax){

1139

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

1140

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

1141

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

1600

1142

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

1601

exitcode = EX_USAGE;

1602

goto end;

1603

}

1604

1605

if(quit_now){

1606

goto end;

1607

}

1608

1143

exitcode = EXIT_FAILURE;

1144

goto end;

1145

}

1609

1146

port = (uint16_t)tmpmax;

1610

1147

*address = '\0';

1611

1148

address = connect_to;

1616

1153

} else {

1617

1154

af = AF_INET;

1618

1155

}

1619

1620

if(quit_now){

1621

goto end;

1622

}

1623

1624

while(not quit_now){

1625

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

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

1156

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

1157

af);

1158

if(ret < 0){

1159

exitcode = EXIT_FAILURE;

1160

} else {

1633

1161

exitcode = EXIT_SUCCESS;

1634

1162

}

1635

1636

1163

goto end;

1637

1164

}

1638

1165

1639

if(quit_now){

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;

1640

1178

goto end;

1641

1179

}

1642

1180

1662

1200

if(mc.server == NULL){

1663

1201

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

1664

1202

avahi_strerror(error));

1665

exitcode = EX_UNAVAILABLE;

1666

goto end;

1667

}

1668

1669

if(quit_now){

1203

exitcode = EXIT_FAILURE;

1670

1204

goto end;

1671

1205

}

1672

1206

1673

1207

/* Create the Avahi service browser */

1674

1208

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

1209

AVAHI_PROTO_INET6, "_mandos._tcp",

1210

NULL, 0, browse_callback, &mc);

1677

1211

if(sb == NULL){

1678

1212

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

1679

1213

avahi_strerror(avahi_server_errno(mc.server)));

1680

exitcode = EX_UNAVAILABLE;

1681

goto end;

1682

}

1683

1684

if(quit_now){

1214

exitcode = EXIT_FAILURE;

1685

1215

goto end;

1686

1216

}

1687

1217

1719

1249

gpgme_release(mc.ctx);

1720

1250

}

1721

1251

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1751

}

1752

}

1753

1754

1252

/* Removes the temp directory used by GPGME */

1755

1253

if(tempdir_created){

1756

1254

DIR *d;

1795

1293

}

1796

1294

}

1797

1295

1798

if(quit_now){

1799

sigemptyset(&old_sigterm_action.sa_mask);

1800

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1804

if(ret == -1){

1805

perror("sigaction");

1806

}

1807

do {

1808

ret = raise(signal_received);

1809

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

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1815

}

1816

1817

1296

return exitcode;

1818

1297

}