/mandos/release : revision 237.2.63

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

86

78

#ifdef __linux__

87

79

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

88

#endif /* __linux__ */

80

#endif

89

81

90

82

/* Avahi */

91

83

/* All Avahi types, constants and functions

125

117

static const char mandos_protocol_version[] = "1";

126

118

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

127

119

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

128

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

129

char *connect_to = NULL;

130

120

131

121

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

132

122

typedef struct {

139

129

gpgme_ctx_t ctx;

140

130

} mandos_context;

141

131

142

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

143

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

144

.dh_bits = 1024, .priority = "SECURE256"

145

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

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

132

/*

151

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

152

* 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,

153

135

* "buffer_length" is how much is already used.

154

136

*/

155

size_t incbuffer(char **buffer, size_t buffer_length,

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

156

138

size_t buffer_capacity){

157

139

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

140

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

167

149

/*

168

150

* Initialize GPGME.

169

151

*/

170

static bool init_gpgme(const char *seckey,

152

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

171

153

const char *pubkey, const char *tempdir){

154

int ret;

172

155

gpgme_error_t rc;

173

156

gpgme_engine_info_t engine_info;

174

157

177

160

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

178

161

*/

179

162

bool import_key(const char *filename){

180

int ret;

181

163

int fd;

182

164

gpgme_data_t pgp_data;

183

165

194

176

return false;

195

177

}

196

178

197

rc = gpgme_op_import(mc.ctx, pgp_data);

179

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

198

180

if(rc != GPG_ERR_NO_ERROR){

199

181

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

200

182

gpgme_strsource(rc), gpgme_strerror(rc));

210

192

}

211

193

212

194

if(debug){

213

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

195

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

214

196

}

215

197

216

198

/* Init GPGME */

243

225

}

244

226

245

227

/* Create new GPGME "context" */

246

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

228

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

247

229

if(rc != GPG_ERR_NO_ERROR){

248

230

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

249

231

gpgme_strsource(rc), gpgme_strerror(rc));

254

236

return false;

255

237

}

256

238

257

return true;

239

return true;

258

240

}

259

241

260

242

/*

261

243

* Decrypt OpenPGP data.

262

244

* Returns -1 on error

263

245

*/

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

265

248

size_t crypto_size,

266

249

char **plaintext){

267

250

gpgme_data_t dh_crypto, dh_plain;

294

277

295

278

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

296

279

data buffer */

297

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

280

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

298

281

if(rc != GPG_ERR_NO_ERROR){

299

282

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

300

283

gpgme_strsource(rc), gpgme_strerror(rc));

301

284

plaintext_length = -1;

302

285

if(debug){

303

286

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

305

288

if(result == NULL){

306

289

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

307

290

} else {

314

297

}

315

298

gpgme_recipient_t recipient;

316

299

recipient = result->recipients;

317

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

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

}

325

310

}

326

311

}

327

312

}

341

326

342

327

*plaintext = NULL;

343

328

while(true){

344

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

345

330

(size_t)plaintext_length,

346

331

plaintext_capacity);

347

332

if(plaintext_capacity == 0){

348

perror("incbuffer");

333

perror("adjustbuffer");

349

334

plaintext_length = -1;

350

335

goto decrypt_end;

351

336

}

397

382

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

398

383

}

399

384

400

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

401

387

const char *seckeyfilename){

402

388

int ret;

403

389

421

407

}

422

408

423

409

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

425

411

if(ret != GNUTLS_E_SUCCESS){

426

412

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

427

from

428

-Wunreachable-code

429

*/

413

* from

414

* -Wunreachable-code

415

*/

430

416

safer_gnutls_strerror(ret));

431

417

gnutls_global_deinit();

432

418

return -1;

439

425

}

440

426

441

427

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

443

429

GNUTLS_OPENPGP_FMT_BASE64);

444

430

if(ret != GNUTLS_E_SUCCESS){

445

431

fprintf(stderr,

451

437

}

452

438

453

439

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

455

441

if(ret != GNUTLS_E_SUCCESS){

456

442

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

457

443

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

458

444

goto globalfail;

459

445

}

460

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

446

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

461

447

if(ret != GNUTLS_E_SUCCESS){

462

448

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

463

449

safer_gnutls_strerror(ret));

464

450

goto globalfail;

465

451

}

466

452

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

468

454

469

455

return 0;

470

456

471

457

globalfail:

472

458

473

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

474

460

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

476

462

return -1;

477

463

}

478

464

479

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

480

467

int ret;

481

468

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

469

ret = gnutls_init(session, GNUTLS_SERVER);

488

470

if(ret != GNUTLS_E_SUCCESS){

489

471

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

490

472

safer_gnutls_strerror(ret));

492

474

493

475

{

494

476

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

477

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

502

478

if(ret != GNUTLS_E_SUCCESS){

503

479

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

504

480

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

508

484

}

509

485

}

510

486

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

519

489

if(ret != GNUTLS_E_SUCCESS){

520

490

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

521

491

safer_gnutls_strerror(ret));

524

494

}

525

495

526

496

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

528

499

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

530

501

531

502

return 0;

532

503

}

538

509

/* Called when a Mandos server is found */

539

510

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

540

511

AvahiIfIndex if_index,

541

int af){

542

int ret, tcp_sd = -1;

512

mandos_context *mc){

513

int ret, tcp_sd;

543

514

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

515

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

548

516

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

517

char *decrypted_buffer;

550

518

size_t buffer_length = 0;

551

519

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

552

521

size_t written;

553

int retval = -1;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

554

524

gnutls_session_t session;

555

int pf; /* Protocol family */

556

557

if(quit_now){

558

return -1;

559

}

560

561

switch(af){

562

case AF_INET6:

563

pf = PF_INET6;

564

break;

565

case AF_INET:

566

pf = PF_INET;

567

break;

568

default:

569

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

570

return -1;

571

}

572

573

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

574

527

if(ret != 0){

575

528

return -1;

576

529

}

577

530

578

531

if(debug){

579

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

532

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

580

533

"\n", ip, port);

581

534

}

582

535

583

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

584

537

if(tcp_sd < 0){

585

538

perror("socket");

586

goto mandos_end;

539

return -1;

587

540

}

588

541

589

if(quit_now){

590

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);

591

548

}

592

549

593

550

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

594

if(af == AF_INET6){

595

to.in6.sin6_family = (sa_family_t)af;

596

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

597

} else { /* IPv4 */

598

to.in.sin_family = (sa_family_t)af;

599

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

600

}

551

to.in6.sin6_family = AF_INET6;

552

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

553

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

554

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

601

555

if(ret < 0 ){

602

556

perror("inet_pton");

603

goto mandos_end;

557

return -1;

604

558

}

605

559

if(ret == 0){

606

560

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

607

goto mandos_end;

561

return -1;

608

562

}

609

if(af == AF_INET6){

610

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

611

-Wconversion and

612

-Wunreachable-code */

613

614

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

615

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

616

-Wunreachable-code*/

617

if(if_index == AVAHI_IF_UNSPEC){

618

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

619

" without a network interface\n");

620

goto mandos_end;

621

}

622

/* Set the network interface number as scope */

623

to.in6.sin6_scope_id = (uint32_t)if_index;

624

}

625

} else {

626

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

563

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

627

564

-Wconversion and

628

565

-Wunreachable-code */

629

}

630

566

631

if(quit_now){

632

goto mandos_end;

633

}

567

to.in6.sin6_scope_id = (uint32_t)if_index;

634

568

635

569

if(debug){

636

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

637

char interface[IF_NAMESIZE];

638

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

639

perror("if_indextoname");

640

} else {

641

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

642

ip, interface, port);

643

}

644

} else {

645

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

646

port);

647

}

648

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

649

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

650

const char *pcret;

651

if(af == AF_INET6){

652

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

653

sizeof(addrstr));

654

} else {

655

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

656

sizeof(addrstr));

657

}

658

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){

659

575

perror("inet_ntop");

660

576

} else {

661

577

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

664

580

}

665

581

}

666

582

667

if(quit_now){

668

goto mandos_end;

669

}

670

671

if(af == AF_INET6){

672

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

673

} else {

674

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

675

}

583

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

676

584

if(ret < 0){

677

585

perror("connect");

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

586

return -1;

683

587

}

684

588

685

589

const char *out = mandos_protocol_version;

690

594

out_size - written));

691

595

if(ret == -1){

692

596

perror("write");

597

retval = -1;

693

598

goto mandos_end;

694

599

}

695

600

written += (size_t)ret;

703

608

break;

704

609

}

705

610

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

710

611

}

711

612

712

613

if(debug){

713

614

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

714

615

}

715

616

716

if(quit_now){

717

goto mandos_end;

718

}

719

720

617

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

618

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

619

do{

727

620

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

731

621

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

732

622

733

623

if(ret != GNUTLS_E_SUCCESS){

735

625

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

736

626

gnutls_perror(ret);

737

627

}

628

retval = -1;

738

629

goto mandos_end;

739

630

}

740

631

741

632

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

742

633

743

634

if(debug){

744

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

635

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

745

636

ip);

746

637

}

747

638

748

639

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

755

641

buffer_capacity);

756

642

if(buffer_capacity == 0){

757

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

643

perror("adjustbuffer");

644

retval = -1;

762

645

goto mandos_end;

763

646

}

764

647

773

656

case GNUTLS_E_AGAIN:

774

657

break;

775

658

case GNUTLS_E_REHANDSHAKE:

776

do {

659

do{

777

660

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

782

661

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

783

662

if(ret < 0){

784

663

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

785

664

gnutls_perror(ret);

665

retval = -1;

786

666

goto mandos_end;

787

667

}

788

668

break;

789

669

default:

790

670

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

791

671

" encrypted session with Mandos server\n");

672

retval = -1;

792

673

gnutls_bye(session, GNUTLS_SHUT_RDWR);

793

674

goto mandos_end;

794

675

}

801

682

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

802

683

}

803

684

804

if(quit_now){

805

goto mandos_end;

806

}

807

808

do {

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

if(quit_now){

811

goto mandos_end;

812

}

813

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

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

814

686

815

687

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

817

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

818

689

buffer_length,

819

690

&decrypted_buffer);

820

691

if(decrypted_buffer_size >= 0){

821

822

692

written = 0;

823

693

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

828

694

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

829

695

(size_t)decrypted_buffer_size - written,

830

696

stdout);

833

699

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

834

700

strerror(errno));

835

701

}

836

goto mandos_end;

702

retval = -1;

703

break;

837

704

}

838

705

written += (size_t)ret;

839

706

}

840

retval = 0;

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

841

710

}

711

} else {

712

retval = -1;

842

713

}

843

714

844

715

/* Shutdown procedure */

845

716

846

717

mandos_end:

847

free(decrypted_buffer);

848

718

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

719

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

852

720

if(ret == -1){

853

721

perror("close");

854

722

}

855

723

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

724

return retval;

860

725

}

861

726

862

727

static void resolve_callback(AvahiSServiceResolver *r,

863

728

AvahiIfIndex interface,

864

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

865

730

AvahiResolverEvent event,

866

731

const char *name,

867

732

const char *type,

872

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

873

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

874

739

flags,

875

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

876

742

assert(r);

877

743

878

744

/* Called whenever a service has been resolved successfully or

879

745

timed out */

880

746

881

if(quit_now){

882

return;

883

}

884

885

747

switch(event){

886

748

default:

887

749

case AVAHI_RESOLVER_FAILURE:

888

750

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

889

751

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

890

avahi_strerror(avahi_server_errno(mc.server)));

752

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

891

753

break;

892

754

893

755

case AVAHI_RESOLVER_FOUND:

899

761

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

900

762

ip, (intmax_t)interface, port);

901

763

}

902

int ret = start_mandos_communication(ip, port, interface,

903

avahi_proto_to_af(proto));

764

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

904

765

if(ret == 0){

905

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

906

767

}

907

768

}

908

769

}

918

779

const char *domain,

919

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

920

781

flags,

921

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

922

784

assert(b);

923

785

924

786

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

925

787

is removed from the LAN */

926

788

927

if(quit_now){

928

return;

929

}

930

931

789

switch(event){

932

790

default:

933

791

case AVAHI_BROWSER_FAILURE:

934

792

935

793

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

936

avahi_strerror(avahi_server_errno(mc.server)));

937

avahi_simple_poll_quit(mc.simple_poll);

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

938

796

return;

939

797

940

798

case AVAHI_BROWSER_NEW:

943

801

the callback function is called the Avahi server will free the

944

802

resolver for us. */

945

803

946

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

947

name, type, domain, protocol, 0,

948

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)))

949

808

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

950

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

809

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

951

810

break;

952

811

953

812

case AVAHI_BROWSER_REMOVE:

962

821

}

963

822

}

964

823

965

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

966

static void handle_sigterm(int sig){

967

if(quit_now){

968

return;

969

}

970

quit_now = 1;

971

signal_received = sig;

972

int old_errno = errno;

973

if(mc.simple_poll != NULL){

974

avahi_simple_poll_quit(mc.simple_poll);

975

}

976

errno = old_errno;

977

}

978

979

/*

980

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

981

* corresponds to an acceptable network device.

982

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

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

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

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

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

994

return 0;

995

}

996

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

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

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

1002

/* read line from flags_fd */

1003

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

1004

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

1005

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

1006

if(flagstring == NULL){

1007

perror("malloc");

1008

close(flags_fd);

1009

return 0;

1010

}

1011

while(to_read > 0){

1012

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

1013

(size_t)to_read));

1014

if(ssret == -1){

1015

perror("read");

1016

free(flagstring);

1017

close(flags_fd);

1018

return 0;

1019

}

1020

to_read -= ssret;

1021

if(ssret == 0){

1022

break;

1023

}

1024

}

1025

close(flags_fd);

1026

intmax_t tmpmax;

1027

char *tmp;

1028

errno = 0;

1029

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

1030

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

1031

and not (isspace(*tmp)))

1032

or tmpmax != (ifreq_flags)tmpmax){

1033

if(debug){

1034

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

1035

flagstring, if_entry->d_name);

1036

}

1037

free(flagstring);

1038

return 0;

1039

}

1040

free(flagstring);

1041

ifreq_flags flags = (ifreq_flags)tmpmax;

1042

/* Reject the loopback device */

1043

if(flags & IFF_LOOPBACK){

1044

if(debug){

1045

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

1046

if_entry->d_name);

1047

}

1048

return 0;

1049

}

1050

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

1051

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

1052

if(debug){

1053

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

1054

if_entry->d_name);

1055

}

1056

return 1;

1057

}

1058

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

1059

if(not (flags & IFF_BROADCAST)){

1060

if(debug){

1061

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

1062

if_entry->d_name);

1063

}

1064

return 0;

1065

}

1066

/* Accept this device */

1067

if(debug){

1068

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

1069

if_entry->d_name);

1070

}

1071

return 1;

1072

}

1073

1074

824

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

1075

825

AvahiSServiceBrowser *sb = NULL;

1076

826

int error;

1077

827

int ret;

1078

828

intmax_t tmpmax;

1079

char *tmp;

829

int numchars;

1080

830

int exitcode = EXIT_SUCCESS;

1081

const char *interface = "";

831

const char *interface = "eth0";

1082

832

struct ifreq network;

1083

int sd = -1;

1084

bool take_down_interface = false;

833

int sd;

1085

834

uid_t uid;

1086

835

gid_t gid;

836

char *connect_to = NULL;

1087

837

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

1088

838

bool tempdir_created = false;

1089

839

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1090

840

const char *seckey = PATHDIR "/" SECKEY;

1091

841

const char *pubkey = PATHDIR "/" PUBKEY;

1092

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

1093

846

bool gnutls_initialized = false;

1094

847

bool gpgme_initialized = false;

1095

float delay = 2.5f;

1096

1097

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1098

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1099

1100

uid = getuid();

1101

gid = getgid();

1102

1103

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

1104

errno = 0;

1105

ret = setgid(gid);

1106

if(ret == -1){

1107

perror("setgid");

1108

}

1109

1110

/* Lower user privileges (temporarily) */

1111

errno = 0;

1112

ret = seteuid(uid);

1113

if(ret == -1){

1114

perror("seteuid");

1115

}

1116

1117

if(quit_now){

1118

goto end;

1119

}

848

double delay = 2.5;

1120

849

1121

850

{

1122

851

struct argp_option options[] = {

1128

857

.group = 1 },

1129

858

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

1130

859

.arg = "NAME",

1131

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

1132

" Mandos servers",

860

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

861

" servers",

1133

862

.group = 1 },

1134

863

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

1135

864

.arg = "FILE",

1174

903

pubkey = arg;

1175

904

break;

1176

905

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

1177

errno = 0;

1178

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

1179

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

1180

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

906

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

907

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

908

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

1181

909

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

1182

910

exit(EXIT_FAILURE);

1183

911

}

1187

915

mc.priority = arg;

1188

916

break;

1189

917

case 131: /* --delay */

1190

errno = 0;

1191

delay = strtof(arg, &tmp);

1192

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

918

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

919

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

1193

920

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

1194

921

exit(EXIT_FAILURE);

1195

922

}

1216

943

}

1217

944

}

1218

945

1219

if(not debug){

1220

avahi_set_log_function(empty_log);

1221

}

1222

1223

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

1224

struct dirent **direntries;

1225

ret = scandir(sys_class_net, &direntries, good_interface,

1226

alphasort);

1227

if(ret >= 1){

1228

/* Pick the first good interface */

1229

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

1230

if(debug){

1231

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

1232

}

1233

if(interface == NULL){

1234

perror("malloc");

1235

free(direntries);

1236

exitcode = EXIT_FAILURE;

1237

goto end;

1238

}

1239

free(direntries);

1240

} else {

1241

free(direntries);

1242

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

1243

exitcode = EXIT_FAILURE;

1244

goto end;

1245

}

1246

}

1247

1248

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

1249

from the signal handler */

1250

/* Initialize the pseudo-RNG for Avahi */

1251

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

1252

mc.simple_poll = avahi_simple_poll_new();

1253

if(mc.simple_poll == NULL){

1254

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

1255

exitcode = EXIT_FAILURE;

1256

goto end;

1257

}

1258

1259

sigemptyset(&sigterm_action.sa_mask);

1260

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

1261

if(ret == -1){

1262

perror("sigaddset");

1263

exitcode = EXIT_FAILURE;

1264

goto end;

1265

}

1266

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

1267

if(ret == -1){

1268

perror("sigaddset");

1269

exitcode = EXIT_FAILURE;

1270

goto end;

1271

}

1272

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

1273

if(ret == -1){

1274

perror("sigaddset");

1275

exitcode = EXIT_FAILURE;

1276

goto end;

1277

}

1278

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

1279

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

1280

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

1281

*/

1282

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

1283

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1286

}

1287

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

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

1289

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1292

goto end;

1293

}

1294

}

1295

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

1296

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1299

}

1300

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

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

1302

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1305

goto end;

1306

}

1307

}

1308

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

1309

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1312

}

1313

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

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

1315

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1318

goto end;

1319

}

1320

}

1321

1322

946

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

1323

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

1324

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

if(if_index == 0){

1326

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

1327

exitcode = EXIT_FAILURE;

1328

goto end;

1329

}

1330

1331

if(quit_now){

1332

goto end;

1333

}

1334

1335

/* Re-raise priviliges */

1336

errno = 0;

1337

ret = seteuid(0);

1338

if(ret == -1){

1339

perror("seteuid");

1340

}

1341

947

{

1342

948

#ifdef __linux__

1343

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1344

950

messages to mess up the prompt */

1345

951

ret = klogctl(8, NULL, 5);

1346

bool restore_loglevel = true;

1347

952

if(ret == -1){

1348

restore_loglevel = false;

1349

953

perror("klogctl");

1350

954

}

1351

#endif /* __linux__ */

955

#endif

1352

956

1353

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1354

958

if(sd < 0){

1355

959

perror("socket");

1356

960

exitcode = EXIT_FAILURE;

1357

961

#ifdef __linux__

1358

if(restore_loglevel){

1359

ret = klogctl(7, NULL, 0);

1360

if(ret == -1){

1361

perror("klogctl");

1362

}

1363

}

1364

#endif /* __linux__ */

1365

/* Lower privileges */

1366

errno = 0;

1367

ret = seteuid(uid);

962

ret = klogctl(7, NULL, 0);

1368

963

if(ret == -1){

1369

perror("seteuid");

964

perror("klogctl");

1370

965

}

966

#endif

1371

967

goto end;

1372

968

}

1373

969

strcpy(network.ifr_name, interface);

1375

971

if(ret == -1){

1376

972

perror("ioctl SIOCGIFFLAGS");

1377

973

#ifdef __linux__

1378

if(restore_loglevel){

1379

ret = klogctl(7, NULL, 0);

1380

if(ret == -1){

1381

perror("klogctl");

1382

}

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1383

977

}

1384

#endif /* __linux__ */

978

#endif

1385

979

exitcode = EXIT_FAILURE;

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1392

980

goto end;

1393

981

}

1394

982

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

1395

983

network.ifr_flags |= IFF_UP;

1396

take_down_interface = true;

1397

984

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

1398

985

if(ret == -1){

1399

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

986

perror("ioctl SIOCSIFFLAGS");

1401

987

exitcode = EXIT_FAILURE;

1402

988

#ifdef __linux__

1403

if(restore_loglevel){

1404

ret = klogctl(7, NULL, 0);

1405

if(ret == -1){

1406

perror("klogctl");

1407

}

1408

}

1409

#endif /* __linux__ */

1410

/* Lower privileges */

1411

errno = 0;

1412

ret = seteuid(uid);

989

ret = klogctl(7, NULL, 0);

1413

990

if(ret == -1){

1414

perror("seteuid");

991

perror("klogctl");

1415

992

}

993

#endif

1416

994

goto end;

1417

995

}

1418

996

}

1430

1008

perror("nanosleep");

1431

1009

}

1432

1010

}

1433

if(not take_down_interface){

1434

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

1435

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

1436

if(ret == -1){

1437

perror("close");

1438

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1439

1014

}

1440

1015

#ifdef __linux__

1441

if(restore_loglevel){

1442

/* Restores kernel loglevel to default */

1443

ret = klogctl(7, NULL, 0);

1444

if(ret == -1){

1445

perror("klogctl");

1446

}

1447

}

1448

#endif /* __linux__ */

1449

/* Lower privileges */

1450

errno = 0;

1451

if(take_down_interface){

1452

/* Lower privileges */

1453

ret = seteuid(uid);

1454

if(ret == -1){

1455

perror("seteuid");

1456

}

1457

} else {

1458

/* Lower privileges permanently */

1459

ret = setuid(uid);

1460

if(ret == -1){

1461

perror("setuid");

1462

}

1463

}

1464

}

1465

1466

if(quit_now){

1467

goto end;

1468

}

1469

1470

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);

1471

1038

if(ret == -1){

1472

1039

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

1473

1040

exitcode = EXIT_FAILURE;

1476

1043

gnutls_initialized = true;

1477

1044

}

1478

1045

1479

if(quit_now){

1480

goto end;

1481

}

1482

1483

tempdir_created = true;

1484

1046

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1486

1047

perror("mkdtemp");

1487

1048

goto end;

1488

1049

}

1489

1490

if(quit_now){

1491

goto end;

1492

}

1493

1494

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

1050

tempdir_created = true;

1051

1052

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

1495

1053

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

1496

1054

exitcode = EXIT_FAILURE;

1497

1055

goto end;

1499

1057

gpgme_initialized = true;

1500

1058

}

1501

1059

1502

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;

1503

1064

goto end;

1504

1065

}

1505

1066

1512

1073

exitcode = EXIT_FAILURE;

1513

1074

goto end;

1514

1075

}

1515

1516

if(quit_now){

1517

goto end;

1518

}

1519

1520

1076

uint16_t port;

1521

errno = 0;

1522

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

1523

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

1524

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'){

1525

1080

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

1526

1081

exitcode = EXIT_FAILURE;

1527

1082

goto end;

1528

1083

}

1529

1530

if(quit_now){

1531

goto end;

1532

}

1533

1534

1084

port = (uint16_t)tmpmax;

1535

1085

*address = '\0';

1536

1086

address = connect_to;

1537

/* Colon in address indicates IPv6 */

1538

int af;

1539

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

1540

af = AF_INET6;

1541

} else {

1542

af = AF_INET;

1543

}

1544

1545

if(quit_now){

1546

goto end;

1547

}

1548

1549

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

1087

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

1550

1088

if(ret < 0){

1551

1089

exitcode = EXIT_FAILURE;

1552

1090

} else {

1555

1093

goto end;

1556

1094

}

1557

1095

1558

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;

1559

1108

goto end;

1560

1109

}

1561

1110

1585

1134

goto end;

1586

1135

}

1587

1136

1588

if(quit_now){

1589

goto end;

1590

}

1591

1592

1137

/* Create the Avahi service browser */

1593

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1594

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1595

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1596

1141

if(sb == NULL){

1597

1142

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

1598

1143

avahi_strerror(avahi_server_errno(mc.server)));

1600

1145

goto end;

1601

1146

}

1602

1147

1603

if(quit_now){

1604

goto end;

1605

}

1606

1607

1148

/* Run the main loop */

1608

1149

1609

1150

if(debug){

1638

1179

gpgme_release(mc.ctx);

1639

1180

}

1640

1181

1641

/* Take down the network interface */

1642

if(take_down_interface){

1643

/* Re-raise priviliges */

1644

errno = 0;

1645

ret = seteuid(0);

1646

if(ret == -1){

1647

perror("seteuid");

1648

}

1649

if(geteuid() == 0){

1650

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

1651

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_UP) {

1654

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

1655

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

1656

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1658

}

1659

}

1660

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

1661

if(ret == -1){

1662

perror("close");

1663

}

1664

/* Lower privileges permanently */

1665

errno = 0;

1666

ret = setuid(uid);

1667

if(ret == -1){

1668

perror("setuid");

1669

}

1670

}

1671

}

1672

1673

1182

/* Removes the temp directory used by GPGME */

1674

1183

if(tempdir_created){

1675

1184

DIR *d;

1714

1223

}

1715

1224

}

1716

1225

1717

if(quit_now){

1718

sigemptyset(&old_sigterm_action.sa_mask);

1719

old_sigterm_action.sa_handler = SIG_DFL;

1720

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1721

&old_sigterm_action,

1722

NULL));

1723

if(ret == -1){

1724

perror("sigaction");

1725

}

1726

do {

1727

ret = raise(signal_received);

1728

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

1729

if(ret != 0){

1730

perror("raise");

1731

abort();

1732

}

1733

TEMP_FAILURE_RETRY(pause());

1734

}

1735

1736

1226

return exitcode;

1737

1227

}