/mandos/trunk : revision 237.2.34

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

37

41

38

42

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

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

42

45

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

43

46

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

44

srand() */

45

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

47

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

48

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

46

49

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

47

50

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

48

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

51

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

49

52

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

50

53

sockaddr_in6, PF_INET6,

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

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

53

DIR */

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

54

56

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

55

57

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

56

struct in6_addr, inet_pton(),

57

connect() */

58

inet_pton(), connect() */

58

59

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

59

60

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

60

61

*/

61

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

62

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

63

strtoimax() */

62

64

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

63

65

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

64

66

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

65

67

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

66

68

SIOCSIFFLAGS, if_indextoname(),

67

69

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

70

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

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

69

73

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

70

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

71

setgid() */

74

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

75

setgid(), pause() */

72

76

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

73

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

77

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

74

78

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

75

79

argp_state, struct argp,

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

78

86

#ifdef __linux__

79

87

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

80

#endif

88

#endif /* __linux__ */

81

89

82

90

/* Avahi */

83

91

/* All Avahi types, constants and functions

117

125

static const char mandos_protocol_version[] = "1";

118

126

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

119

127

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;

120

130

121

131

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

122

132

typedef struct {

129

139

gpgme_ctx_t ctx;

130

140

} mandos_context;

131

141

142

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

143

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

144

.dh_bits = 1024, .priority = "SECURE256"

145

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

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

132

150

/*

133

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

134

* "buffer_capacity" is how much is currently allocated,

151

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

152

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

135

153

* "buffer_length" is how much is already used.

136

154

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

155

size_t incbuffer(char **buffer, size_t buffer_length,

138

156

size_t buffer_capacity){

139

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

158

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

149

167

/*

150

168

* Initialize GPGME.

151

169

*/

152

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

170

static bool init_gpgme(const char *seckey,

153

171

const char *pubkey, const char *tempdir){

154

int ret;

155

172

gpgme_error_t rc;

156

173

gpgme_engine_info_t engine_info;

157

174

160

177

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

161

178

*/

162

179

bool import_key(const char *filename){

180

int ret;

163

181

int fd;

164

182

gpgme_data_t pgp_data;

165

183

176

194

return false;

177

195

}

178

196

179

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

197

rc = gpgme_op_import(mc.ctx, pgp_data);

180

198

if(rc != GPG_ERR_NO_ERROR){

181

199

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

182

200

gpgme_strsource(rc), gpgme_strerror(rc));

192

210

}

193

211

194

212

if(debug){

195

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

213

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

196

214

}

197

215

198

216

/* Init GPGME */

225

243

}

226

244

227

245

/* Create new GPGME "context" */

228

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

246

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

229

247

if(rc != GPG_ERR_NO_ERROR){

230

248

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

231

249

gpgme_strsource(rc), gpgme_strerror(rc));

236

254

return false;

237

255

}

238

256

239

return true;

257

return true;

240

258

}

241

259

242

260

/*

243

261

* Decrypt OpenPGP data.

244

262

* Returns -1 on error

245

263

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

264

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

265

size_t crypto_size,

249

266

char **plaintext){

250

267

gpgme_data_t dh_crypto, dh_plain;

277

294

278

295

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

279

296

data buffer */

280

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

297

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

281

298

if(rc != GPG_ERR_NO_ERROR){

282

299

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

283

300

gpgme_strsource(rc), gpgme_strerror(rc));

284

301

plaintext_length = -1;

285

302

if(debug){

286

303

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

304

result = gpgme_op_decrypt_result(mc.ctx);

288

305

if(result == NULL){

289

306

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

290

307

} else {

297

314

}

298

315

gpgme_recipient_t recipient;

299

316

recipient = result->recipients;

300

if(recipient){

301

while(recipient != NULL){

302

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

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

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

305

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

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

317

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

310

325

}

311

326

}

312

327

}

326

341

327

342

*plaintext = NULL;

328

343

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

344

plaintext_capacity = incbuffer(plaintext,

330

345

(size_t)plaintext_length,

331

346

plaintext_capacity);

332

347

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

348

perror("incbuffer");

334

349

plaintext_length = -1;

335

350

goto decrypt_end;

336

351

}

382

397

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

383

398

}

384

399

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

400

static int init_gnutls_global(const char *pubkeyfilename,

387

401

const char *seckeyfilename){

388

402

int ret;

389

403

407

421

}

408

422

409

423

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

411

425

if(ret != GNUTLS_E_SUCCESS){

412

426

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

413

* from

414

* -Wunreachable-code

415

*/

427

from

428

-Wunreachable-code

429

*/

416

430

safer_gnutls_strerror(ret));

417

431

gnutls_global_deinit();

418

432

return -1;

425

439

}

426

440

427

441

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

442

(mc.cred, pubkeyfilename, seckeyfilename,

429

443

GNUTLS_OPENPGP_FMT_BASE64);

430

444

if(ret != GNUTLS_E_SUCCESS){

431

445

fprintf(stderr,

437

451

}

438

452

439

453

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

454

ret = gnutls_dh_params_init(&mc.dh_params);

441

455

if(ret != GNUTLS_E_SUCCESS){

442

456

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

443

457

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

444

458

goto globalfail;

445

459

}

446

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

460

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

447

461

if(ret != GNUTLS_E_SUCCESS){

448

462

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

449

463

safer_gnutls_strerror(ret));

450

464

goto globalfail;

451

465

}

452

466

453

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

467

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

468

455

469

return 0;

456

470

457

471

globalfail:

458

472

459

gnutls_certificate_free_credentials(mc->cred);

473

gnutls_certificate_free_credentials(mc.cred);

460

474

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

475

gnutls_dh_params_deinit(mc.dh_params);

462

476

return -1;

463

477

}

464

478

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

479

static int init_gnutls_session(gnutls_session_t *session){

467

480

int ret;

468

481

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

470

488

if(ret != GNUTLS_E_SUCCESS){

471

489

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

472

490

safer_gnutls_strerror(ret));

474

492

475

493

{

476

494

const char *err;

477

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

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

478

502

if(ret != GNUTLS_E_SUCCESS){

479

503

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

480

504

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

484

508

}

485

509

}

486

510

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

489

519

if(ret != GNUTLS_E_SUCCESS){

490

520

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

491

521

safer_gnutls_strerror(ret));

494

524

}

495

525

496

526

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

528

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

530

502

531

return 0;

503

532

}

509

538

/* Called when a Mandos server is found */

510

539

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

511

540

AvahiIfIndex if_index,

512

mandos_context *mc){

513

int ret, tcp_sd;

541

int af){

542

int ret, tcp_sd = -1;

514

543

ssize_t sret;

515

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

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

516

548

char *buffer = NULL;

517

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

518

550

size_t buffer_length = 0;

519

551

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

521

552

size_t written;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

553

int retval = -1;

524

554

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &session);

555

int pf; /* Protocol family */

556

557

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);

527

574

if(ret != 0){

528

575

return -1;

529

576

}

530

577

531

578

if(debug){

532

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

579

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

533

580

"\n", ip, port);

534

581

}

535

582

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

583

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

584

if(tcp_sd < 0){

538

585

perror("socket");

539

return -1;

586

goto mandos_end;

540

587

}

541

588

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);

589

if(quit_now){

590

goto mandos_end;

548

591

}

549

592

550

593

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

551

to.in6.sin6_family = AF_INET6;

552

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

553

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

554

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

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

}

555

601

if(ret < 0 ){

556

602

perror("inet_pton");

557

return -1;

603

goto mandos_end;

558

604

}

559

605

if(ret == 0){

560

606

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

561

return -1;

607

goto mandos_end;

562

608

}

563

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

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

564

627

-Wconversion and

565

628

-Wunreachable-code */

629

}

566

630

567

to.in6.sin6_scope_id = (uint32_t)if_index;

631

if(quit_now){

632

goto mandos_end;

633

}

568

634

569

635

if(debug){

570

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

571

port);

572

char addrstr[INET6_ADDRSTRLEN] = "";

573

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

574

sizeof(addrstr)) == NULL){

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){

575

659

perror("inet_ntop");

576

660

} else {

577

661

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

580

664

}

581

665

}

582

666

583

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

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

}

584

676

if(ret < 0){

585

677

perror("connect");

586

return -1;

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

587

683

}

588

684

589

685

const char *out = mandos_protocol_version;

594

690

out_size - written));

595

691

if(ret == -1){

596

692

perror("write");

597

retval = -1;

598

693

goto mandos_end;

599

694

}

600

695

written += (size_t)ret;

608

703

break;

609

704

}

610

705

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

611

710

}

612

711

613

712

if(debug){

614

713

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

615

714

}

616

715

716

if(quit_now){

717

goto mandos_end;

718

}

719

617

720

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

618

721

619

do{

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

620

727

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

621

731

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

622

732

623

733

if(ret != GNUTLS_E_SUCCESS){

625

735

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

626

736

gnutls_perror(ret);

627

737

}

628

retval = -1;

629

738

goto mandos_end;

630

739

}

631

740

632

741

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

633

742

634

743

if(debug){

635

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

744

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

636

745

ip);

637

746

}

638

747

639

748

while(true){

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

buffer_capacity = incbuffer(&buffer, buffer_length,

641

755

buffer_capacity);

642

756

if(buffer_capacity == 0){

643

perror("adjustbuffer");

644

retval = -1;

757

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

645

762

goto mandos_end;

646

763

}

647

764

656

773

case GNUTLS_E_AGAIN:

657

774

break;

658

775

case GNUTLS_E_REHANDSHAKE:

659

do{

776

do {

660

777

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

661

782

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

662

783

if(ret < 0){

663

784

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

664

785

gnutls_perror(ret);

665

retval = -1;

666

786

goto mandos_end;

667

787

}

668

788

break;

669

789

default:

670

790

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

671

791

" encrypted session with Mandos server\n");

672

retval = -1;

673

792

gnutls_bye(session, GNUTLS_SHUT_RDWR);

674

793

goto mandos_end;

675

794

}

682

801

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

683

802

}

684

803

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

686

814

687

815

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

816

ssize_t decrypted_buffer_size;

817

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

818

buffer_length,

690

819

&decrypted_buffer);

691

820

if(decrypted_buffer_size >= 0){

821

692

822

written = 0;

693

823

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

694

828

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

695

829

(size_t)decrypted_buffer_size - written,

696

830

stdout);

699

833

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

700

834

strerror(errno));

701

835

}

702

retval = -1;

703

break;

836

goto mandos_end;

704

837

}

705

838

written += (size_t)ret;

706

839

}

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

840

retval = 0;

710

841

}

711

} else {

712

retval = -1;

713

842

}

714

843

715

844

/* Shutdown procedure */

716

845

717

846

mandos_end:

847

free(decrypted_buffer);

718

848

free(buffer);

719

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

849

if(tcp_sd >= 0){

850

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

851

}

720

852

if(ret == -1){

721

853

perror("close");

722

854

}

723

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

724

859

return retval;

725

860

}

726

861

727

862

static void resolve_callback(AvahiSServiceResolver *r,

728

863

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

864

AvahiProtocol proto,

730

865

AvahiResolverEvent event,

731

866

const char *name,

732

867

const char *type,

737

872

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

873

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

874

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

875

AVAHI_GCC_UNUSED void* userdata){

742

876

assert(r);

743

877

744

878

/* Called whenever a service has been resolved successfully or

745

879

timed out */

746

880

881

if(quit_now){

882

return;

883

}

884

747

885

switch(event){

748

886

default:

749

887

case AVAHI_RESOLVER_FAILURE:

750

888

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

751

889

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

752

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

890

avahi_strerror(avahi_server_errno(mc.server)));

753

891

break;

754

892

755

893

case AVAHI_RESOLVER_FOUND:

761

899

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

762

900

ip, (intmax_t)interface, port);

763

901

}

764

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

902

int ret = start_mandos_communication(ip, port, interface,

903

avahi_proto_to_af(proto));

765

904

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

905

avahi_simple_poll_quit(mc.simple_poll);

767

906

}

768

907

}

769

908

}

779

918

const char *domain,

780

919

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

920

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

921

AVAHI_GCC_UNUSED void* userdata){

784

922

assert(b);

785

923

786

924

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

787

925

is removed from the LAN */

788

926

927

if(quit_now){

928

return;

929

}

930

789

931

switch(event){

790

932

default:

791

933

case AVAHI_BROWSER_FAILURE:

792

934

793

935

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

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

936

avahi_strerror(avahi_server_errno(mc.server)));

937

avahi_simple_poll_quit(mc.simple_poll);

796

938

return;

797

939

798

940

case AVAHI_BROWSER_NEW:

801

943

the callback function is called the Avahi server will free the

802

944

resolver for us. */

803

945

804

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

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

946

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

947

name, type, domain, protocol, 0,

948

resolve_callback, NULL) == NULL)

808

949

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

809

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

950

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

810

951

break;

811

952

812

953

case AVAHI_BROWSER_REMOVE:

821

962

}

822

963

}

823

964

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

824

1074

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

825

1075

AvahiSServiceBrowser *sb = NULL;

826

1076

int error;

827

1077

int ret;

828

1078

intmax_t tmpmax;

829

int numchars;

1079

char *tmp;

830

1080

int exitcode = EXIT_SUCCESS;

831

const char *interface = "eth0";

1081

const char *interface = "";

832

1082

struct ifreq network;

833

int sd;

1083

int sd = -1;

1084

bool take_down_interface = false;

834

1085

uid_t uid;

835

1086

gid_t gid;

836

char *connect_to = NULL;

837

1087

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

838

1088

bool tempdir_created = false;

839

1089

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

840

1090

const char *seckey = PATHDIR "/" SECKEY;

841

1091

const char *pubkey = PATHDIR "/" PUBKEY;

842

1092

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

846

1093

bool gnutls_initialized = false;

847

1094

bool gpgme_initialized = false;

848

double delay = 2.5;

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

}

849

1120

850

1121

{

851

1122

struct argp_option options[] = {

857

1128

.group = 1 },

858

1129

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

859

1130

.arg = "NAME",

860

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

861

" servers",

1131

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

1132

" Mandos servers",

862

1133

.group = 1 },

863

1134

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

864

1135

.arg = "FILE",

903

1174

pubkey = arg;

904

1175

break;

905

1176

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

906

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

907

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

908

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

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){

909

1181

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

910

1182

exit(EXIT_FAILURE);

911

1183

}

915

1187

mc.priority = arg;

916

1188

break;

917

1189

case 131: /* --delay */

918

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

919

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

1190

errno = 0;

1191

delay = strtof(arg, &tmp);

1192

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

920

1193

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

921

1194

exit(EXIT_FAILURE);

922

1195

}

943

1216

}

944

1217

}

945

1218

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

946

1322

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

947

{

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

948

1342

#ifdef __linux__

949

1343

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

1344

messages to mess up the prompt */

951

1345

ret = klogctl(8, NULL, 5);

1346

bool restore_loglevel = true;

952

1347

if(ret == -1){

1348

restore_loglevel = false;

953

1349

perror("klogctl");

954

1350

}

955

#endif

1351

#endif /* __linux__ */

956

1352

957

1353

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1354

if(sd < 0){

959

1355

perror("socket");

960

1356

exitcode = EXIT_FAILURE;

961

1357

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

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);

963

1368

if(ret == -1){

964

perror("klogctl");

1369

perror("seteuid");

965

1370

}

966

#endif

967

1371

goto end;

968

1372

}

969

1373

strcpy(network.ifr_name, interface);

971

1375

if(ret == -1){

972

1376

perror("ioctl SIOCGIFFLAGS");

973

1377

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

1378

if(restore_loglevel){

1379

ret = klogctl(7, NULL, 0);

1380

if(ret == -1){

1381

perror("klogctl");

1382

}

1383

}

1384

#endif /* __linux__ */

1385

exitcode = EXIT_FAILURE;

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

975

1389

if(ret == -1){

976

perror("klogctl");

1390

perror("seteuid");

977

1391

}

978

#endif

979

exitcode = EXIT_FAILURE;

980

1392

goto end;

981

1393

}

982

1394

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

983

1395

network.ifr_flags |= IFF_UP;

1396

take_down_interface = true;

984

1397

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

985

1398

if(ret == -1){

986

perror("ioctl SIOCSIFFLAGS");

1399

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

987

1401

exitcode = EXIT_FAILURE;

988

1402

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

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);

990

1413

if(ret == -1){

991

perror("klogctl");

1414

perror("seteuid");

992

1415

}

993

#endif

994

1416

goto end;

995

1417

}

996

1418

}

1008

1430

perror("nanosleep");

1009

1431

}

1010

1432

}

1011

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

1012

if(ret == -1){

1013

perror("close");

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

}

1014

1439

}

1015

1440

#ifdef __linux__

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1020

}

1021

#endif

1022

}

1023

1024

uid = getuid();

1025

gid = getgid();

1026

1027

setgid(gid);

1028

if(ret == -1){

1029

perror("setgid");

1030

}

1031

1032

ret = setuid(uid);

1033

if(ret == -1){

1034

perror("setuid");

1035

}

1036

1037

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

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);

1038

1471

if(ret == -1){

1039

1472

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

1040

1473

exitcode = EXIT_FAILURE;

1043

1476

gnutls_initialized = true;

1044

1477

}

1045

1478

1479

if(quit_now){

1480

goto end;

1481

}

1482

1483

tempdir_created = true;

1046

1484

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1047

1486

perror("mkdtemp");

1048

1487

goto end;

1049

1488

}

1050

tempdir_created = true;

1051

1052

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

1489

1490

if(quit_now){

1491

goto end;

1492

}

1493

1494

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

1053

1495

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

1054

1496

exitcode = EXIT_FAILURE;

1055

1497

goto end;

1057

1499

gpgme_initialized = true;

1058

1500

}

1059

1501

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;

1502

if(quit_now){

1064

1503

goto end;

1065

1504

}

1066

1505

1073

1512

exitcode = EXIT_FAILURE;

1074

1513

goto end;

1075

1514

}

1515

1516

if(quit_now){

1517

goto end;

1518

}

1519

1076

1520

uint16_t port;

1077

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

1078

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

1079

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

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){

1080

1525

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

1081

1526

exitcode = EXIT_FAILURE;

1082

1527

goto end;

1083

1528

}

1529

1530

if(quit_now){

1531

goto end;

1532

}

1533

1084

1534

port = (uint16_t)tmpmax;

1085

1535

*address = '\0';

1086

1536

address = connect_to;

1087

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

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);

1088

1550

if(ret < 0){

1089

1551

exitcode = EXIT_FAILURE;

1090

1552

} else {

1093

1555

goto end;

1094

1556

}

1095

1557

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;

1558

if(quit_now){

1108

1559

goto end;

1109

1560

}

1110

1561

1134

1585

goto end;

1135

1586

}

1136

1587

1588

if(quit_now){

1589

goto end;

1590

}

1591

1137

1592

/* Create the Avahi service browser */

1138

1593

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1594

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1595

NULL, 0, browse_callback, NULL);

1141

1596

if(sb == NULL){

1142

1597

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

1143

1598

avahi_strerror(avahi_server_errno(mc.server)));

1145

1600

goto end;

1146

1601

}

1147

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1148

1607

/* Run the main loop */

1149

1608

1150

1609

if(debug){

1179

1638

gpgme_release(mc.ctx);

1180

1639

}

1181

1640

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

1182

1673

/* Removes the temp directory used by GPGME */

1183

1674

if(tempdir_created){

1184

1675

DIR *d;

1223

1714

}

1224

1715

}

1225

1716

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

1226

1736

return exitcode;

1227

1737

}