/mandos/release : revision 237.2.185

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

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

44

srand() */

45

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

46

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

47

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

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

78

88

#ifdef __linux__

79

89

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

80

#endif

90

#endif /* __linux__ */

81

91

82

92

/* Avahi */

83

93

/* All Avahi types, constants and functions

117

127

static const char mandos_protocol_version[] = "1";

118

128

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

119

129

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

130

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

131

char *connect_to = NULL;

120

132

121

133

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

122

134

typedef struct {

129

141

gpgme_ctx_t ctx;

130

142

} mandos_context;

131

143

144

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

145

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

146

.dh_bits = 1024, .priority = "SECURE256"

147

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

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

132

152

/*

133

* Make 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.

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.

136

156

*/

137

157

size_t incbuffer(char **buffer, size_t buffer_length,

138

158

size_t buffer_capacity){

149

169

/*

150

170

* Initialize GPGME.

151

171

*/

152

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

172

static bool init_gpgme(const char *seckey,

153

173

const char *pubkey, const char *tempdir){

154

int ret;

155

174

gpgme_error_t rc;

156

175

gpgme_engine_info_t engine_info;

157

176

160

179

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

161

180

*/

162

181

bool import_key(const char *filename){

182

int ret;

163

183

int fd;

164

184

gpgme_data_t pgp_data;

165

185

176

196

return false;

177

197

}

178

198

179

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

199

rc = gpgme_op_import(mc.ctx, pgp_data);

180

200

if(rc != GPG_ERR_NO_ERROR){

181

201

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

182

202

gpgme_strsource(rc), gpgme_strerror(rc));

192

212

}

193

213

194

214

if(debug){

195

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

215

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

196

216

}

197

217

198

218

/* Init GPGME */

225

245

}

226

246

227

247

/* Create new GPGME "context" */

228

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

248

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

229

249

if(rc != GPG_ERR_NO_ERROR){

230

250

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

231

251

gpgme_strsource(rc), gpgme_strerror(rc));

236

256

return false;

237

257

}

238

258

239

return true;

259

return true;

240

260

}

241

261

242

262

/*

243

263

* Decrypt OpenPGP data.

244

264

* Returns -1 on error

245

265

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

267

size_t crypto_size,

249

268

char **plaintext){

250

269

gpgme_data_t dh_crypto, dh_plain;

277

296

278

297

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

279

298

data buffer */

280

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

299

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

281

300

if(rc != GPG_ERR_NO_ERROR){

282

301

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

283

302

gpgme_strsource(rc), gpgme_strerror(rc));

284

303

plaintext_length = -1;

285

304

if(debug){

286

305

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

288

307

if(result == NULL){

289

308

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

290

309

} else {

297

316

}

298

317

gpgme_recipient_t recipient;

299

318

recipient = result->recipients;

300

if(recipient){

301

while(recipient != NULL){

302

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

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

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

305

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

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

319

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

310

327

}

311

328

}

312

329

}

382

399

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

383

400

}

384

401

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

402

static int init_gnutls_global(const char *pubkeyfilename,

387

403

const char *seckeyfilename){

388

404

int ret;

389

405

407

423

}

408

424

409

425

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

411

427

if(ret != GNUTLS_E_SUCCESS){

412

428

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

413

* from

414

* -Wunreachable-code

415

*/

429

from

430

-Wunreachable-code

431

*/

416

432

safer_gnutls_strerror(ret));

417

433

gnutls_global_deinit();

418

434

return -1;

425

441

}

426

442

427

443

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

429

445

GNUTLS_OPENPGP_FMT_BASE64);

430

446

if(ret != GNUTLS_E_SUCCESS){

431

447

fprintf(stderr,

437

453

}

438

454

439

455

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

456

ret = gnutls_dh_params_init(&mc.dh_params);

441

457

if(ret != GNUTLS_E_SUCCESS){

442

458

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

443

459

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

444

460

goto globalfail;

445

461

}

446

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

462

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

447

463

if(ret != GNUTLS_E_SUCCESS){

448

464

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

449

465

safer_gnutls_strerror(ret));

450

466

goto globalfail;

451

467

}

452

468

453

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

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

470

455

471

return 0;

456

472

457

473

globalfail:

458

474

459

gnutls_certificate_free_credentials(mc->cred);

475

gnutls_certificate_free_credentials(mc.cred);

460

476

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

477

gnutls_dh_params_deinit(mc.dh_params);

462

478

return -1;

463

479

}

464

480

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

481

static int init_gnutls_session(gnutls_session_t *session){

467

482

int ret;

468

483

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

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

470

490

if(ret != GNUTLS_E_SUCCESS){

471

491

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

472

492

safer_gnutls_strerror(ret));

474

494

475

495

{

476

496

const char *err;

477

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

497

do {

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

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

478

504

if(ret != GNUTLS_E_SUCCESS){

479

505

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

480

506

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

484

510

}

485

511

}

486

512

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

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

489

521

if(ret != GNUTLS_E_SUCCESS){

490

522

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

491

523

safer_gnutls_strerror(ret));

494

526

}

495

527

496

528

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

530

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

532

502

533

return 0;

503

534

}

509

540

/* Called when a Mandos server is found */

510

541

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

511

542

AvahiIfIndex if_index,

512

mandos_context *mc){

513

int ret, tcp_sd;

543

int af){

544

int ret, tcp_sd = -1;

514

545

ssize_t sret;

515

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

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

516

550

char *buffer = NULL;

517

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

518

552

size_t buffer_length = 0;

519

553

size_t buffer_capacity = 0;

520

ssize_t decrypted_buffer_size;

521

554

size_t written;

522

int retval = 0;

523

char interface[IF_NAMESIZE];

555

int retval = -1;

524

556

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &session);

557

int pf; /* Protocol family */

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

566

switch(af){

567

case AF_INET6:

568

pf = PF_INET6;

569

break;

570

case AF_INET:

571

pf = PF_INET;

572

break;

573

default:

574

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

575

errno = EINVAL;

576

return -1;

577

}

578

579

ret = init_gnutls_session(&session);

527

580

if(ret != 0){

528

581

return -1;

529

582

}

530

583

531

584

if(debug){

532

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

585

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

533

586

"\n", ip, port);

534

587

}

535

588

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

590

if(tcp_sd < 0){

591

int e = errno;

538

592

perror("socket");

539

return -1;

593

errno = e;

594

goto mandos_end;

540

595

}

541

596

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);

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

548

600

}

549

601

550

602

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);

603

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

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

606

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

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

609

}

555

610

if(ret < 0 ){

611

int e = errno;

556

612

perror("inet_pton");

557

return -1;

613

errno = e;

614

goto mandos_end;

558

615

}

559

616

if(ret == 0){

617

int e = errno;

560

618

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

561

return -1;

619

errno = e;

620

goto mandos_end;

562

621

}

563

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

622

if(af == AF_INET6){

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

630

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

633

errno = EINVAL;

634

goto mandos_end;

635

}

636

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

638

}

639

} else {

640

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

564

641

-Wconversion and

565

642

-Wunreachable-code */

643

}

566

644

567

to.in6.sin6_scope_id = (uint32_t)if_index;

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

568

649

569

650

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){

651

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

652

char interface[IF_NAMESIZE];

653

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

654

perror("if_indextoname");

655

} else {

656

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

657

ip, interface, port);

658

}

659

} else {

660

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

661

port);

662

}

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

669

} else {

670

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

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

575

674

perror("inet_ntop");

576

675

} else {

577

676

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

580

679

}

581

680

}

582

681

583

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

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

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

689

} else {

690

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

691

}

584

692

if(ret < 0){

693

int e = errno;

585

694

perror("connect");

586

return -1;

695

errno = e;

696

goto mandos_end;

697

}

698

699

if(quit_now){

700

errno = EINTR;

701

goto mandos_end;

587

702

}

588

703

589

704

const char *out = mandos_protocol_version;

593

708

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

594

709

out_size - written));

595

710

if(ret == -1){

711

int e = errno;

596

712

perror("write");

597

retval = -1;

713

errno = e;

598

714

goto mandos_end;

599

715

}

600

716

written += (size_t)ret;

608

724

break;

609

725

}

610

726

}

727

728

if(quit_now){

729

errno = EINTR;

730

goto mandos_end;

731

}

611

732

}

612

733

613

734

if(debug){

614

735

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

615

736

}

616

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

617

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

618

744

619

do{

745

if(quit_now){

746

errno = EINTR;

747

goto mandos_end;

748

}

749

750

do {

620

751

ret = gnutls_handshake(session);

752

if(quit_now){

753

errno = EINTR;

754

goto mandos_end;

755

}

621

756

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

622

757

623

758

if(ret != GNUTLS_E_SUCCESS){

625

760

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

626

761

gnutls_perror(ret);

627

762

}

628

retval = -1;

763

errno = EPROTO;

629

764

goto mandos_end;

630

765

}

631

766

632

767

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

633

768

634

769

if(debug){

635

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

770

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

636

771

ip);

637

772

}

638

773

639

774

while(true){

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

779

}

780

640

781

buffer_capacity = incbuffer(&buffer, buffer_length,

641

782

buffer_capacity);

642

783

if(buffer_capacity == 0){

784

int e = errno;

643

785

perror("incbuffer");

644

retval = -1;

786

errno = e;

787

goto mandos_end;

788

}

789

790

if(quit_now){

791

errno = EINTR;

645

792

goto mandos_end;

646

793

}

647

794

656

803

case GNUTLS_E_AGAIN:

657

804

break;

658

805

case GNUTLS_E_REHANDSHAKE:

659

do{

806

do {

660

807

ret = gnutls_handshake(session);

808

809

if(quit_now){

810

errno = EINTR;

811

goto mandos_end;

812

}

661

813

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

662

814

if(ret < 0){

663

815

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

664

816

gnutls_perror(ret);

665

retval = -1;

817

errno = EPROTO;

666

818

goto mandos_end;

667

819

}

668

820

break;

669

821

default:

670

822

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

671

823

" encrypted session with Mandos server\n");

672

retval = -1;

673

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

674

826

goto mandos_end;

675

827

}

676

828

} else {

682

834

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

683

835

}

684

836

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

837

if(quit_now){

838

errno = EINTR;

839

goto mandos_end;

840

}

841

842

do {

843

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

844

if(quit_now){

845

errno = EINTR;

846

goto mandos_end;

847

}

848

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

686

849

687

850

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

851

ssize_t decrypted_buffer_size;

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

853

buffer_length,

690

854

&decrypted_buffer);

691

855

if(decrypted_buffer_size >= 0){

856

692

857

written = 0;

693

858

while(written < (size_t) decrypted_buffer_size){

859

if(quit_now){

860

errno = EINTR;

861

goto mandos_end;

862

}

863

694

864

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

695

865

(size_t)decrypted_buffer_size - written,

696

866

stdout);

697

867

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

868

int e = errno;

698

869

if(debug){

699

870

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

700

871

strerror(errno));

701

872

}

702

retval = -1;

703

break;

873

errno = e;

874

goto mandos_end;

704

875

}

705

876

written += (size_t)ret;

706

877

}

707

free(decrypted_buffer);

708

} else {

709

retval = -1;

878

retval = 0;

710

879

}

711

} else {

712

retval = -1;

713

880

}

714

881

715

882

/* Shutdown procedure */

716

883

717

884

mandos_end:

718

free(buffer);

719

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

720

if(ret == -1){

721

perror("close");

885

{

886

int e = errno;

887

free(decrypted_buffer);

888

free(buffer);

889

if(tcp_sd >= 0){

890

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

891

}

892

if(ret == -1){

893

if(e == 0){

894

e = errno;

895

}

896

perror("close");

897

}

898

gnutls_deinit(session);

899

if(quit_now){

900

e = EINTR;

901

retval = -1;

902

}

903

errno = e;

722

904

}

723

gnutls_deinit(session);

724

905

return retval;

725

906

}

726

907

727

908

static void resolve_callback(AvahiSServiceResolver *r,

728

909

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

910

AvahiProtocol proto,

730

911

AvahiResolverEvent event,

731

912

const char *name,

732

913

const char *type,

737

918

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

919

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

920

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

921

AVAHI_GCC_UNUSED void* userdata){

742

922

assert(r);

743

923

744

924

/* Called whenever a service has been resolved successfully or

745

925

timed out */

746

926

927

if(quit_now){

928

return;

929

}

930

747

931

switch(event){

748

932

default:

749

933

case AVAHI_RESOLVER_FAILURE:

750

934

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

751

935

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

752

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

936

avahi_strerror(avahi_server_errno(mc.server)));

753

937

break;

754

938

755

939

case AVAHI_RESOLVER_FOUND:

761

945

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

762

946

ip, (intmax_t)interface, port);

763

947

}

764

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

948

int ret = start_mandos_communication(ip, port, interface,

949

avahi_proto_to_af(proto));

765

950

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

951

avahi_simple_poll_quit(mc.simple_poll);

767

952

}

768

953

}

769

954

}

779

964

const char *domain,

780

965

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

966

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

967

AVAHI_GCC_UNUSED void* userdata){

784

968

assert(b);

785

969

786

970

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

787

971

is removed from the LAN */

788

972

973

if(quit_now){

974

return;

975

}

976

789

977

switch(event){

790

978

default:

791

979

case AVAHI_BROWSER_FAILURE:

792

980

793

981

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

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

982

avahi_strerror(avahi_server_errno(mc.server)));

983

avahi_simple_poll_quit(mc.simple_poll);

796

984

return;

797

985

798

986

case AVAHI_BROWSER_NEW:

801

989

the callback function is called the Avahi server will free the

802

990

resolver for us. */

803

991

804

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

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

992

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

993

name, type, domain, protocol, 0,

994

resolve_callback, NULL) == NULL)

808

995

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

809

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

996

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

810

997

break;

811

998

812

999

case AVAHI_BROWSER_REMOVE:

821

1008

}

822

1009

}

823

1010

1011

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

1012

static void handle_sigterm(int sig){

1013

if(quit_now){

1014

return;

1015

}

1016

quit_now = 1;

1017

signal_received = sig;

1018

int old_errno = errno;

1019

if(mc.simple_poll != NULL){

1020

avahi_simple_poll_quit(mc.simple_poll);

1021

}

1022

errno = old_errno;

1023

}

1024

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

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

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

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

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

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

1048

/* read line from flags_fd */

1049

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

1050

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

1051

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

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

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

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

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

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1079

if(debug){

1080

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

1081

flagstring, if_entry->d_name);

1082

}

1083

free(flagstring);

1084

return 0;

1085

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1088

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1090

if(debug){

1091

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

1092

if_entry->d_name);

1093

}

1094

return 0;

1095

}

1096

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

1097

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

1098

if(debug){

1099

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

1100

if_entry->d_name);

1101

}

1102

return 1;

1103

}

1104

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

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1112

/* Accept this device */

1113

if(debug){

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1118

}

1119

824

1120

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

825

1121

AvahiSServiceBrowser *sb = NULL;

826

1122

int error;

827

1123

int ret;

828

1124

intmax_t tmpmax;

829

int numchars;

1125

char *tmp;

830

1126

int exitcode = EXIT_SUCCESS;

831

const char *interface = "eth0";

1127

const char *interface = "";

832

1128

struct ifreq network;

833

int sd;

1129

int sd = -1;

1130

bool take_down_interface = false;

834

1131

uid_t uid;

835

1132

gid_t gid;

836

char *connect_to = NULL;

837

1133

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

838

1134

bool tempdir_created = false;

839

1135

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

840

1136

const char *seckey = PATHDIR "/" SECKEY;

841

1137

const char *pubkey = PATHDIR "/" PUBKEY;

842

1138

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

846

1139

bool gnutls_initialized = false;

847

1140

bool gpgme_initialized = false;

848

double delay = 2.5;

1141

float delay = 2.5f;

1142

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

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

1150

errno = 0;

1151

ret = setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

/* Lower user privileges (temporarily) */

1157

errno = 0;

1158

ret = seteuid(uid);

1159

if(ret == -1){

1160

perror("seteuid");

1161

}

1162

1163

if(quit_now){

1164

goto end;

1165

}

849

1166

850

1167

{

851

1168

struct argp_option options[] = {

857

1174

.group = 1 },

858

1175

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

859

1176

.arg = "NAME",

860

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

861

" servers",

1177

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

1178

" Mandos servers",

862

1179

.group = 1 },

863

1180

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

864

1181

.arg = "FILE",

881

1198

.arg = "SECONDS",

882

1199

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

883

1200

.group = 2 },

1201

/*

1202

* These reproduce what we would get without ARGP_NO_HELP

1203

*/

1204

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

1205

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

1206

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

1207

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

1208

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

1209

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

884

1210

{ .name = NULL }

885

1211

};

886

1212

887

1213

error_t parse_opt(int key, char *arg,

888

1214

struct argp_state *state){

1215

errno = 0;

889

1216

switch(key){

890

1217

case 128: /* --debug */

891

1218

debug = true;

903

1230

pubkey = arg;

904

1231

break;

905

1232

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'){

909

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

910

exit(EXIT_FAILURE);

1233

errno = 0;

1234

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

1235

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

1236

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

1237

argp_error(state, "Bad number of DH bits");

911

1238

}

912

1239

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

913

1240

break;

915

1242

mc.priority = arg;

916

1243

break;

917

1244

case 131: /* --delay */

918

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

919

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

920

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

921

exit(EXIT_FAILURE);

1245

errno = 0;

1246

delay = strtof(arg, &tmp);

1247

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

1248

argp_error(state, "Bad delay");

922

1249

}

923

1250

break;

924

case ARGP_KEY_ARG:

925

argp_usage(state);

926

case ARGP_KEY_END:

1251

/*

1252

* These reproduce what we would get without ARGP_NO_HELP

1253

*/

1254

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

1255

argp_state_help(state, state->out_stream,

1256

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1257

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1258

case -3: /* --usage */

1259

argp_state_help(state, state->out_stream,

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

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

1262

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

1263

exit(argp_err_exit_status);

927

1264

break;

928

1265

default:

929

1266

return ARGP_ERR_UNKNOWN;

930

1267

}

931

return 0;

1268

return errno;

932

1269

}

933

1270

934

1271

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

935

1272

.args_doc = "",

936

1273

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

937

1274

" passwords from a Mandos server" };

938

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

939

if(ret == ARGP_ERR_UNKNOWN){

940

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

1275

ret = argp_parse(&argp, argc, argv,

1276

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1277

switch(ret){

1278

case 0:

1279

break;

1280

case ENOMEM:

1281

default:

1282

errno = ret;

1283

perror("argp_parse");

1284

exitcode = EX_OSERR;

1285

goto end;

1286

case EINVAL:

1287

exitcode = EX_USAGE;

1288

goto end;

1289

}

1290

}

1291

1292

if(not debug){

1293

avahi_set_log_function(empty_log);

1294

}

1295

1296

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

1297

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1299

alphasort);

1300

if(ret >= 1){

1301

/* Pick the first good interface */

1302

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

1303

if(debug){

1304

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

1305

}

1306

if(interface == NULL){

1307

perror("malloc");

1308

free(direntries);

1309

exitcode = EXIT_FAILURE;

1310

goto end;

1311

}

1312

free(direntries);

1313

} else {

1314

free(direntries);

1315

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

941

1316

exitcode = EXIT_FAILURE;

942

1317

goto end;

943

1318

}

944

1319

}

945

1320

1321

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

1322

from the signal handler */

1323

/* Initialize the pseudo-RNG for Avahi */

1324

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

1325

mc.simple_poll = avahi_simple_poll_new();

1326

if(mc.simple_poll == NULL){

1327

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

1328

exitcode = EX_UNAVAILABLE;

1329

goto end;

1330

}

1331

1332

sigemptyset(&sigterm_action.sa_mask);

1333

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

1334

if(ret == -1){

1335

perror("sigaddset");

1336

exitcode = EX_OSERR;

1337

goto end;

1338

}

1339

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

1340

if(ret == -1){

1341

perror("sigaddset");

1342

exitcode = EX_OSERR;

1343

goto end;

1344

}

1345

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

1346

if(ret == -1){

1347

perror("sigaddset");

1348

exitcode = EX_OSERR;

1349

goto end;

1350

}

1351

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

1352

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

1353

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

1354

*/

1355

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

1356

if(ret == -1){

1357

perror("sigaction");

1358

return EX_OSERR;

1359

}

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

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

1362

if(ret == -1){

1363

perror("sigaction");

1364

exitcode = EX_OSERR;

1365

goto end;

1366

}

1367

}

1368

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

1369

if(ret == -1){

1370

perror("sigaction");

1371

return EX_OSERR;

1372

}

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

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

1375

if(ret == -1){

1376

perror("sigaction");

1377

exitcode = EX_OSERR;

1378

goto end;

1379

}

1380

}

1381

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

1382

if(ret == -1){

1383

perror("sigaction");

1384

return EX_OSERR;

1385

}

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

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

1388

if(ret == -1){

1389

perror("sigaction");

1390

exitcode = EX_OSERR;

1391

goto end;

1392

}

1393

}

1394

946

1395

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

947

{

1396

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

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

if(if_index == 0){

1399

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

1400

exitcode = EX_UNAVAILABLE;

1401

goto end;

1402

}

1403

1404

if(quit_now){

1405

goto end;

1406

}

1407

1408

/* Re-raise priviliges */

1409

errno = 0;

1410

ret = seteuid(0);

1411

if(ret == -1){

1412

perror("seteuid");

1413

}

1414

948

1415

#ifdef __linux__

949

1416

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

messages to mess up the prompt */

1417

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

951

1418

ret = klogctl(8, NULL, 5);

1419

bool restore_loglevel = true;

952

1420

if(ret == -1){

1421

restore_loglevel = false;

953

1422

perror("klogctl");

954

1423

}

955

#endif

1424

#endif /* __linux__ */

956

1425

957

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1427

if(sd < 0){

959

1428

perror("socket");

960

exitcode = EXIT_FAILURE;

1429

exitcode = EX_OSERR;

961

1430

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

1431

if(restore_loglevel){

1432

ret = klogctl(7, NULL, 0);

1433

if(ret == -1){

1434

perror("klogctl");

1435

}

1436

}

1437

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

963

1441

if(ret == -1){

964

perror("klogctl");

1442

perror("seteuid");

965

1443

}

966

#endif

967

1444

goto end;

968

1445

}

969

1446

strcpy(network.ifr_name, interface);

971

1448

if(ret == -1){

972

1449

perror("ioctl SIOCGIFFLAGS");

973

1450

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

1451

if(restore_loglevel){

1452

ret = klogctl(7, NULL, 0);

1453

if(ret == -1){

1454

perror("klogctl");

1455

}

1456

}

1457

#endif /* __linux__ */

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

975

1462

if(ret == -1){

976

perror("klogctl");

1463

perror("seteuid");

977

1464

}

978

#endif

979

exitcode = EXIT_FAILURE;

980

1465

goto end;

981

1466

}

982

1467

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

983

1468

network.ifr_flags |= IFF_UP;

1469

take_down_interface = true;

984

1470

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

985

1471

if(ret == -1){

986

perror("ioctl SIOCSIFFLAGS");

987

exitcode = EXIT_FAILURE;

1472

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

988

1475

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

1476

if(restore_loglevel){

1477

ret = klogctl(7, NULL, 0);

1478

if(ret == -1){

1479

perror("klogctl");

1480

}

1481

}

1482

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

990

1486

if(ret == -1){

991

perror("klogctl");

1487

perror("seteuid");

992

1488

}

993

#endif

994

1489

goto end;

995

1490

}

996

1491

}

1008

1503

perror("nanosleep");

1009

1504

}

1010

1505

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1506

if(not take_down_interface){

1507

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

1508

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

1509

if(ret == -1){

1510

perror("close");

1511

}

1014

1512

}

1015

1513

#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);

1514

if(restore_loglevel){

1515

/* Restores kernel loglevel to default */

1516

ret = klogctl(7, NULL, 0);

1517

if(ret == -1){

1518

perror("klogctl");

1519

}

1520

}

1521

#endif /* __linux__ */

1522

/* Lower privileges */

1523

errno = 0;

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

1536

}

1537

}

1538

1539

if(quit_now){

1540

goto end;

1541

}

1542

1543

ret = init_gnutls_global(pubkey, seckey);

1038

1544

if(ret == -1){

1039

1545

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

1040

exitcode = EXIT_FAILURE;

1546

exitcode = EX_UNAVAILABLE;

1041

1547

goto end;

1042

1548

} else {

1043

1549

gnutls_initialized = true;

1044

1550

}

1045

1551

1552

if(quit_now){

1553

goto end;

1554

}

1555

1556

tempdir_created = true;

1046

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1047

1559

perror("mkdtemp");

1048

1560

goto end;

1049

1561

}

1050

tempdir_created = true;

1051

1052

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

1562

1563

if(quit_now){

1564

goto end;

1565

}

1566

1567

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

1053

1568

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

1054

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1055

1570

goto end;

1056

1571

} else {

1057

1572

gpgme_initialized = true;

1058

1573

}

1059

1574

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;

1575

if(quit_now){

1064

1576

goto end;

1065

1577

}

1066

1578

1070

1582

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

1071

1583

if(address == NULL){

1072

1584

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

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1075

}

1585

exitcode = EX_USAGE;

1586

goto end;

1587

}

1588

1589

if(quit_now){

1590

goto end;

1591

}

1592

1076

1593

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'){

1594

errno = 0;

1595

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

1596

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

1597

or tmpmax != (uint16_t)tmpmax){

1080

1598

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

1081

exitcode = EXIT_FAILURE;

1082

goto end;

1083

}

1599

exitcode = EX_USAGE;

1600

goto end;

1601

}

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1084

1607

port = (uint16_t)tmpmax;

1085

1608

*address = '\0';

1086

1609

address = connect_to;

1087

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

1610

/* Colon in address indicates IPv6 */

1611

int af;

1612

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

1613

af = AF_INET6;

1614

} else {

1615

af = AF_INET;

1616

}

1617

1618

if(quit_now){

1619

goto end;

1620

}

1621

1622

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

1088

1623

if(ret < 0){

1089

exitcode = EXIT_FAILURE;

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1090

1643

} else {

1091

1644

exitcode = EXIT_SUCCESS;

1092

1645

}

1093

1646

goto end;

1094

1647

}

1095

1648

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;

1649

if(quit_now){

1108

1650

goto end;

1109

1651

}

1110

1652

1130

1672

if(mc.server == NULL){

1131

1673

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

1132

1674

avahi_strerror(error));

1133

exitcode = EXIT_FAILURE;

1675

exitcode = EX_UNAVAILABLE;

1676

goto end;

1677

}

1678

1679

if(quit_now){

1134

1680

goto end;

1135

1681

}

1136

1682

1137

1683

/* Create the Avahi service browser */

1138

1684

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

NULL, 0, browse_callback, NULL);

1141

1687

if(sb == NULL){

1142

1688

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

1143

1689

avahi_strerror(avahi_server_errno(mc.server)));

1144

exitcode = EXIT_FAILURE;

1690

exitcode = EX_UNAVAILABLE;

1691

goto end;

1692

}

1693

1694

if(quit_now){

1145

1695

goto end;

1146

1696

}

1147

1697

1179

1729

gpgme_release(mc.ctx);

1180

1730

}

1181

1731

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1737

if(ret == -1){

1738

perror("seteuid");

1739

}

1740

if(geteuid() == 0){

1741

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

1742

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

1745

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

1746

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

1747

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1749

}

1750

}

1751

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

1752

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

1760

}

1761

}

1762

}

1763

1182

1764

/* Removes the temp directory used by GPGME */

1183

1765

if(tempdir_created){

1184

1766

DIR *d;

1223

1805

}

1224

1806

}

1225

1807

1808

if(quit_now){

1809

sigemptyset(&old_sigterm_action.sa_mask);

1810

old_sigterm_action.sa_handler = SIG_DFL;

1811

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1812

&old_sigterm_action,

1813

NULL));

1814

if(ret == -1){

1815

perror("sigaction");

1816

}

1817

do {

1818

ret = raise(signal_received);

1819

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

1820

if(ret != 0){

1821

perror("raise");

1822

abort();

1823

}

1824

TEMP_FAILURE_RETRY(pause());

1825

}

1826

1226

1827

return exitcode;

1227

1828

}