/mandos/release : revision 237.2.10

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos-client - get and decrypt data from a Mandos server

3

* Mandos client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

36

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

37

38

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

39

stdout, ferror(), sscanf */

39

stdout, ferror() */

40

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

41

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

42

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

48

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

49

sockaddr_in6, PF_INET6,

50

SOCK_STREAM, INET6_ADDRSTRLEN,

51

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

52

DIR */

51

uid_t, gid_t, open(), opendir(), DIR */

53

52

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

54

53

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

55

54

struct in6_addr, inet_pton(),

56

55

connect() */

57

56

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

58

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

59

*/

60

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

57

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

58

#include <inttypes.h> /* PRIu16 */

61

59

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

62

60

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

63

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

61

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

64

62

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

65

63

SIOCSIFFLAGS, if_indextoname(),

66

64

if_nametoindex(), IF_NAMESIZE */

69

67

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

70

68

setgid() */

71

69

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

72

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

70

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

73

71

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

74

72

argp_state, struct argp,

75

73

argp_parse(), ARGP_KEY_ARG,

76

74

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

77

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

78

75

79

76

/* Avahi */

80

77

/* All Avahi types, constants and functions

93

90

gnutls_*

94

91

init_gnutls_session(),

95

92

GNUTLS_* */

96

#include <gnutls/openpgp.h>

97

/* gnutls_certificate_set_openpgp_key_file(),

93

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

98

94

GNUTLS_OPENPGP_FMT_BASE64 */

99

95

100

96

/* GPGME */

133

129

*/

134

130

size_t adjustbuffer(char **buffer, size_t buffer_length,

135

131

size_t buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

132

if (buffer_length + BUFFER_SIZE > buffer_capacity){

137

133

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

138

if(buffer == NULL){

134

if (buffer == NULL){

139

135

return 0;

140

136

}

141

137

buffer_capacity += BUFFER_SIZE;

160

156

int fd;

161

157

gpgme_data_t pgp_data;

162

158

163

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

159

fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

164

160

if(fd == -1){

165

161

perror("open");

166

162

return false;

167

163

}

168

164

169

165

rc = gpgme_data_new_from_fd(&pgp_data, fd);

170

if(rc != GPG_ERR_NO_ERROR){

166

if (rc != GPG_ERR_NO_ERROR){

171

167

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

172

168

gpgme_strsource(rc), gpgme_strerror(rc));

173

169

return false;

174

170

}

175

171

176

172

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

177

if(rc != GPG_ERR_NO_ERROR){

173

if (rc != GPG_ERR_NO_ERROR){

178

174

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

179

175

gpgme_strsource(rc), gpgme_strerror(rc));

180

176

return false;

181

177

}

182

178

183

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

179

ret = TEMP_FAILURE_RETRY(close(fd));

184

180

if(ret == -1){

185

181

perror("close");

186

182

}

188

184

return true;

189

185

}

190

186

191

if(debug){

187

if (debug){

192

188

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

193

189

}

194

190

195

191

/* Init GPGME */

196

192

gpgme_check_version(NULL);

197

193

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

198

if(rc != GPG_ERR_NO_ERROR){

194

if (rc != GPG_ERR_NO_ERROR){

199

195

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

200

196

gpgme_strsource(rc), gpgme_strerror(rc));

201

197

return false;

202

198

}

203

199

204

200

/* Set GPGME home directory for the OpenPGP engine only */

205

rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

201

rc = gpgme_get_engine_info (&engine_info);

202

if (rc != GPG_ERR_NO_ERROR){

207

203

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

208

204

gpgme_strsource(rc), gpgme_strerror(rc));

209

205

return false;

223

219

224

220

/* Create new GPGME "context" */

225

221

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

226

if(rc != GPG_ERR_NO_ERROR){

222

if (rc != GPG_ERR_NO_ERROR){

227

223

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

228

224

gpgme_strsource(rc), gpgme_strerror(rc));

229

225

return false;

230

226

}

231

227

232

if(not import_key(pubkey) or not import_key(seckey)){

228

if (not import_key(pubkey) or not import_key(seckey)){

233

229

return false;

234

230

}

235

231

240

236

* Decrypt OpenPGP data.

241

237

* Returns -1 on error

242

238

*/

243

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

244

const char *cryptotext,

245

size_t crypto_size,

246

char **plaintext){

239

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

240

const char *cryptotext,

241

size_t crypto_size,

242

char **plaintext){

247

243

gpgme_data_t dh_crypto, dh_plain;

248

244

gpgme_error_t rc;

249

245

ssize_t ret;

250

246

size_t plaintext_capacity = 0;

251

247

ssize_t plaintext_length = 0;

252

248

253

if(debug){

249

if (debug){

254

250

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

255

251

}

256

252

257

253

/* Create new GPGME data buffer from memory cryptotext */

258

254

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

259

255

0);

260

if(rc != GPG_ERR_NO_ERROR){

256

if (rc != GPG_ERR_NO_ERROR){

261

257

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

262

258

gpgme_strsource(rc), gpgme_strerror(rc));

263

259

return -1;

265

261

266

262

/* Create new empty GPGME data buffer for the plaintext */

267

263

rc = gpgme_data_new(&dh_plain);

268

if(rc != GPG_ERR_NO_ERROR){

264

if (rc != GPG_ERR_NO_ERROR){

269

265

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

270

266

gpgme_strsource(rc), gpgme_strerror(rc));

271

267

gpgme_data_release(dh_crypto);

275

271

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

276

272

data buffer */

277

273

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

278

if(rc != GPG_ERR_NO_ERROR){

274

if (rc != GPG_ERR_NO_ERROR){

279

275

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

280

276

gpgme_strsource(rc), gpgme_strerror(rc));

281

277

plaintext_length = -1;

282

if(debug){

278

if (debug){

283

279

gpgme_decrypt_result_t result;

284

280

result = gpgme_op_decrypt_result(mc->ctx);

285

if(result == NULL){

281

if (result == NULL){

286

282

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

287

283

} else {

288

284

fprintf(stderr, "Unsupported algorithm: %s\n",

315

311

}

316

312

317

313

/* Seek back to the beginning of the GPGME plaintext data buffer */

318

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

314

if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){

319

315

perror("gpgme_data_seek");

320

316

plaintext_length = -1;

321

317

goto decrypt_end;

326

322

plaintext_capacity = adjustbuffer(plaintext,

327

323

(size_t)plaintext_length,

328

324

plaintext_capacity);

329

if(plaintext_capacity == 0){

325

if (plaintext_capacity == 0){

330

326

perror("adjustbuffer");

331

327

plaintext_length = -1;

332

328

goto decrypt_end;

335

331

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

336

332

BUFFER_SIZE);

337

333

/* Print the data, if any */

338

if(ret == 0){

334

if (ret == 0){

339

335

/* EOF */

340

336

break;

341

337

}

365

361

return plaintext_length;

366

362

}

367

363

368

static const char * safer_gnutls_strerror(int value) {

369

const char *ret = gnutls_strerror(value); /* Spurious warning from

370

-Wunreachable-code */

371

if(ret == NULL)

364

static const char * safer_gnutls_strerror (int value) {

365

const char *ret = gnutls_strerror (value); /* Spurious warning */

366

if (ret == NULL)

372

367

ret = "(unknown)";

373

368

return ret;

374

369

}

389

384

}

390

385

391

386

ret = gnutls_global_init();

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

387

if (ret != GNUTLS_E_SUCCESS) {

388

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

389

safer_gnutls_strerror(ret));

395

390

return -1;

396

391

}

397

392

398

if(debug){

393

if (debug){

399

394

/* "Use a log level over 10 to enable all debugging options."

400

395

* - GnuTLS manual

401

396

*/

405

400

406

401

/* OpenPGP credentials */

407

402

gnutls_certificate_allocate_credentials(&mc->cred);

408

if(ret != GNUTLS_E_SUCCESS){

409

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

410

* from

411

* -Wunreachable-code

412

*/

413

safer_gnutls_strerror(ret));

414

gnutls_global_deinit();

403

if (ret != GNUTLS_E_SUCCESS){

404

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

405

warning */

406

safer_gnutls_strerror(ret));

407

gnutls_global_deinit ();

415

408

return -1;

416

409

}

417

410

424

417

ret = gnutls_certificate_set_openpgp_key_file

425

418

(mc->cred, pubkeyfilename, seckeyfilename,

426

419

GNUTLS_OPENPGP_FMT_BASE64);

427

if(ret != GNUTLS_E_SUCCESS) {

420

if (ret != GNUTLS_E_SUCCESS) {

428

421

fprintf(stderr,

429

422

"Error[%d] while reading the OpenPGP key pair ('%s',"

430

423

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

435

428

436

429

/* GnuTLS server initialization */

437

430

ret = gnutls_dh_params_init(&mc->dh_params);

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

431

if (ret != GNUTLS_E_SUCCESS) {

432

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

433

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

441

434

goto globalfail;

442

435

}

443

436

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

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

437

if (ret != GNUTLS_E_SUCCESS) {

438

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

439

safer_gnutls_strerror(ret));

447

440

goto globalfail;

448

441

}

449

442

464

457

int ret;

465

458

/* GnuTLS session creation */

466

459

ret = gnutls_init(session, GNUTLS_SERVER);

467

if(ret != GNUTLS_E_SUCCESS){

460

if (ret != GNUTLS_E_SUCCESS){

468

461

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

469

462

safer_gnutls_strerror(ret));

470

463

}

472

465

{

473

466

const char *err;

474

467

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

475

if(ret != GNUTLS_E_SUCCESS) {

468

if (ret != GNUTLS_E_SUCCESS) {

476

469

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

477

470

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

478

471

safer_gnutls_strerror(ret));

479

gnutls_deinit(*session);

472

gnutls_deinit (*session);

480

473

return -1;

481

474

}

482

475

}

483

476

484

477

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

485

478

mc->cred);

486

if(ret != GNUTLS_E_SUCCESS) {

479

if (ret != GNUTLS_E_SUCCESS) {

487

480

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

488

481

safer_gnutls_strerror(ret));

489

gnutls_deinit(*session);

482

gnutls_deinit (*session);

490

483

return -1;

491

484

}

492

485

493

486

/* ignore client certificate if any. */

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

487

gnutls_certificate_server_set_request (*session,

488

GNUTLS_CERT_IGNORE);

496

489

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

490

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

498

491

499

492

return 0;

500

493

}

508

501

AvahiIfIndex if_index,

509

502

mandos_context *mc){

510

503

int ret, tcp_sd;

511

ssize_t sret;

512

504

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

513

505

char *buffer = NULL;

514

506

char *decrypted_buffer;

520

512

char interface[IF_NAMESIZE];

521

513

gnutls_session_t session;

522

514

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

515

ret = init_gnutls_session (mc, &session);

516

if (ret != 0){

525

517

return -1;

526

518

}

527

519

549

541

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

550

542

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

551

543

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

552

if(ret < 0 ){

544

if (ret < 0 ){

553

545

perror("inet_pton");

554

546

return -1;

555

547

}

557

549

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

558

550

return -1;

559

551

}

560

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

561

-Wconversion and

562

-Wunreachable-code */

552

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

563

553

564

554

to.in6.sin6_scope_id = (uint32_t)if_index;

565

555

578

568

}

579

569

580

570

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

581

if(ret < 0){

571

if (ret < 0){

582

572

perror("connect");

583

573

return -1;

584

574

}

585

575

586

576

const char *out = mandos_protocol_version;

587

577

written = 0;

588

while(true){

578

while (true){

589

579

size_t out_size = strlen(out);

590

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

580

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

591

581

out_size - written));

592

if(ret == -1){

582

if (ret == -1){

593

583

perror("write");

594

584

retval = -1;

595

585

goto mandos_end;

598

588

if(written < out_size){

599

589

continue;

600

590

} else {

601

if(out == mandos_protocol_version){

591

if (out == mandos_protocol_version){

602

592

written = 0;

603

593

out = "\r\n";

604

594

} else {

611

601

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

612

602

}

613

603

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

604

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

615

605

616

606

do{

617

ret = gnutls_handshake(session);

607

ret = gnutls_handshake (session);

618

608

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

619

609

620

if(ret != GNUTLS_E_SUCCESS){

610

if (ret != GNUTLS_E_SUCCESS){

621

611

if(debug){

622

612

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

623

gnutls_perror(ret);

613

gnutls_perror (ret);

624

614

}

625

615

retval = -1;

626

616

goto mandos_end;

636

626

while(true){

637

627

buffer_capacity = adjustbuffer(&buffer, buffer_length,

638

628

buffer_capacity);

639

if(buffer_capacity == 0){

629

if (buffer_capacity == 0){

640

630

perror("adjustbuffer");

641

631

retval = -1;

642

632

goto mandos_end;

643

633

}

644

634

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

635

ret = gnutls_record_recv(session, buffer+buffer_length,

636

BUFFER_SIZE);

637

if (ret == 0){

648

638

break;

649

639

}

650

if(sret < 0){

651

switch(sret){

640

if (ret < 0){

641

switch(ret){

652

642

case GNUTLS_E_INTERRUPTED:

653

643

case GNUTLS_E_AGAIN:

654

644

break;

655

645

case GNUTLS_E_REHANDSHAKE:

656

646

do{

657

ret = gnutls_handshake(session);

647

ret = gnutls_handshake (session);

658

648

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

659

if(ret < 0){

649

if (ret < 0){

660

650

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

661

gnutls_perror(ret);

651

gnutls_perror (ret);

662

652

retval = -1;

663

653

goto mandos_end;

664

654

}

667

657

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

668

658

" encrypted session with Mandos server\n");

669

659

retval = -1;

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

660

gnutls_bye (session, GNUTLS_SHUT_RDWR);

671

661

goto mandos_end;

672

662

}

673

663

} else {

674

buffer_length += (size_t) sret;

664

buffer_length += (size_t) ret;

675

665

}

676

666

}

677

667

679

669

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

680

670

}

681

671

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

672

gnutls_bye (session, GNUTLS_SHUT_RDWR);

683

673

684

if(buffer_length > 0){

674

if (buffer_length > 0){

685

675

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

686

676

buffer_length,

687

677

&decrypted_buffer);

688

if(decrypted_buffer_size >= 0){

678

if (decrypted_buffer_size >= 0){

689

679

written = 0;

690

680

while(written < (size_t) decrypted_buffer_size){

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

681

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

682

(size_t)decrypted_buffer_size - written,

683

stdout);

694

684

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

695

685

if(debug){

696

686

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

713

703

714

704

mandos_end:

715

705

free(buffer);

716

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

706

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

717

707

if(ret == -1){

718

708

perror("close");

719

709

}

720

gnutls_deinit(session);

710

gnutls_deinit (session);

721

711

return retval;

722

712

}

723

713

741

731

/* Called whenever a service has been resolved successfully or

742

732

timed out */

743

733

744

switch(event) {

734

switch (event) {

745

735

default:

746

736

case AVAHI_RESOLVER_FAILURE:

747

737

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

755

745

avahi_address_snprint(ip, sizeof(ip), address);

756

746

if(debug){

757

747

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

758

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

759

ip, (intmax_t)interface, port);

748

PRIu16 ") on port %d\n", name, host_name, ip,

749

interface, port);

760

750

}

761

751

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

762

if(ret == 0){

752

if (ret == 0){

763

753

avahi_simple_poll_quit(mc->simple_poll);

764

754

}

765

755

}

783

773

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

784

774

is removed from the LAN */

785

775

786

switch(event) {

776

switch (event) {

787

777

default:

788

778

case AVAHI_BROWSER_FAILURE:

789

779

798

788

the callback function is called the Avahi server will free the

799

789

resolver for us. */

800

790

801

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

791

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

802

792

protocol, name, type, domain,

803

793

AVAHI_PROTO_INET6, 0,

804

794

resolve_callback, mc)))

822

812

AvahiSServiceBrowser *sb = NULL;

823

813

int error;

824

814

int ret;

825

intmax_t tmpmax;

826

int numchars;

827

815

int exitcode = EXIT_SUCCESS;

828

816

const char *interface = "eth0";

829

817

struct ifreq network;

841

829

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

842

830

bool gnutls_initalized = false;

843

831

bool gpgme_initalized = false;

844

double delay = 2.5;

845

832

846

833

{

847

834

struct argp_option options[] = {

873

860

.arg = "STRING",

874

861

.doc = "GnuTLS priority string for the TLS handshake",

875

862

.group = 1 },

876

{ .name = "delay", .key = 131,

877

.arg = "SECONDS",

878

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

879

.group = 2 },

880

863

{ .name = NULL }

881

864

};

882

865

883

error_t parse_opt(int key, char *arg,

884

struct argp_state *state) {

885

switch(key) {

866

error_t parse_opt (int key, char *arg,

867

struct argp_state *state) {

868

/* Get the INPUT argument from `argp_parse', which we know is

869

a pointer to our plugin list pointer. */

870

switch (key) {

886

871

case 128: /* --debug */

887

872

debug = true;

888

873

break;

899

884

pubkey = arg;

900

885

break;

901

886

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

902

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

903

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

904

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

905

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

887

errno = 0;

888

mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);

889

if (errno){

890

perror("strtol");

906

891

exit(EXIT_FAILURE);

907

892

}

908

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

909

893

break;

910

894

case 130: /* --priority */

911

895

mc.priority = arg;

912

896

break;

913

case 131: /* --delay */

914

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

915

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

916

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

917

exit(EXIT_FAILURE);

918

}

919

break;

920

897

case ARGP_KEY_ARG:

921

argp_usage(state);

898

argp_usage (state);

922

899

case ARGP_KEY_END:

923

900

break;

924

901

default:

931

908

.args_doc = "",

932

909

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

933

910

" passwords from a Mandos server" };

934

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

935

if(ret == ARGP_ERR_UNKNOWN){

911

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

912

if (ret == ARGP_ERR_UNKNOWN){

936

913

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

937

914

exitcode = EXIT_FAILURE;

938

915

goto end;

941

918

942

919

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

943

920

{

944

// Lower kernel loglevel to KERN_NOTICE to avoid

945

// KERN_INFO messages to mess up the prompt

946

ret = klogctl(8, NULL, 5);

947

if(ret == -1){

948

perror("klogctl");

949

}

950

951

921

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

952

922

if(sd < 0) {

953

923

perror("socket");

954

924

exitcode = EXIT_FAILURE;

955

ret = klogctl(7, NULL, 0);

956

if(ret == -1){

957

perror("klogctl");

958

}

959

925

goto end;

960

926

}

961

927

strcpy(network.ifr_name, interface);

962

928

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

963

929

if(ret == -1){

964

930

perror("ioctl SIOCGIFFLAGS");

965

ret = klogctl(7, NULL, 0);

966

if(ret == -1){

967

perror("klogctl");

968

}

969

931

exitcode = EXIT_FAILURE;

970

932

goto end;

971

933

}

975

937

if(ret == -1){

976

938

perror("ioctl SIOCSIFFLAGS");

977

939

exitcode = EXIT_FAILURE;

978

ret = klogctl(7, NULL, 0);

979

if(ret == -1){

980

perror("klogctl");

981

}

982

940

goto end;

983

941

}

984

942

}

985

// sleep checking until interface is running

986

for(int i=0; i < delay * 4; i++){

987

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

988

if(ret == -1){

989

perror("ioctl SIOCGIFFLAGS");

990

} else if(network.ifr_flags & IFF_RUNNING){

991

break;

992

}

993

struct timespec sleeptime = { .tv_nsec = 250000000 };

994

nanosleep(&sleeptime, NULL);

995

}

996

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

943

ret = TEMP_FAILURE_RETRY(close(sd));

997

944

if(ret == -1){

998

945

perror("close");

999

946

}

1000

// Restores kernel loglevel to default

1001

ret = klogctl(7, NULL, 0);

1002

if(ret == -1){

1003

perror("klogctl");

1004

}

1005

947

}

1006

948

1007

949

uid = getuid();

1008

950

gid = getgid();

1009

951

1010

952

ret = setuid(uid);

1011

if(ret == -1){

953

if (ret == -1){

1012

954

perror("setuid");

1013

955

}

1014

956

1015

957

setgid(gid);

1016

if(ret == -1){

958

if (ret == -1){

1017

959

perror("setgid");

1018

960

}

1019

961

1020

962

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

1021

if(ret == -1){

963

if (ret == -1){

1022

964

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

1023

965

exitcode = EXIT_FAILURE;

1024

966

goto end;

1055

997

exitcode = EXIT_FAILURE;

1056

998

goto end;

1057

999

}

1058

uint16_t port;

1059

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

1060

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

1061

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

1062

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

1000

errno = 0;

1001

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

1002

if(errno){

1003

perror("Bad port number");

1063

1004

exitcode = EXIT_FAILURE;

1064

1005

goto end;

1065

1006

}

1066

port = (uint16_t)tmpmax;

1067

1007

*address = '\0';

1068

1008

address = connect_to;

1069

1009

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

1075

1015

goto end;

1076

1016

}

1077

1017

1078

if(not debug){

1018

if (not debug){

1079

1019

avahi_set_log_function(empty_log);

1080

1020

}

1081

1021

1084

1024

1085

1025

/* Allocate main Avahi loop object */

1086

1026

mc.simple_poll = avahi_simple_poll_new();

1087

if(mc.simple_poll == NULL) {

1027

if (mc.simple_poll == NULL) {

1088

1028

fprintf(stderr, "Avahi: Failed to create simple poll"

1089

1029

" object.\n");

1090

1030

exitcode = EXIT_FAILURE;

1110

1050

}

1111

1051

1112

1052

/* Check if creating the Avahi server object succeeded */

1113

if(mc.server == NULL) {

1053

if (mc.server == NULL) {

1114

1054

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

1115

1055

avahi_strerror(error));

1116

1056

exitcode = EXIT_FAILURE;

1122

1062

AVAHI_PROTO_INET6,

1123

1063

"_mandos._tcp", NULL, 0,

1124

1064

browse_callback, &mc);

1125

if(sb == NULL) {

1065

if (sb == NULL) {

1126

1066

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

1127

1067

avahi_strerror(avahi_server_errno(mc.server)));

1128

1068

exitcode = EXIT_FAILURE;

1131

1071

1132

1072

/* Run the main loop */

1133

1073

1134

if(debug){

1074

if (debug){

1135

1075

fprintf(stderr, "Starting Avahi loop search\n");

1136

1076

}

1137

1077

1138

1078

avahi_simple_poll_loop(mc.simple_poll);

1139

1079

1140

1080

end:

1141

1081

1142

if(debug){

1082

if (debug){

1143

1083

fprintf(stderr, "%s exiting\n", argv[0]);

1144

1084

}

1145

1085

1146

1086

/* Cleanup things */

1147

if(sb != NULL)

1087

if (sb != NULL)

1148

1088

avahi_s_service_browser_free(sb);

1149

1089

1150

if(mc.server != NULL)

1090

if (mc.server != NULL)

1151

1091

avahi_server_free(mc.server);

1152

1092

1153

if(mc.simple_poll != NULL)

1093

if (mc.simple_poll != NULL)

1154

1094

avahi_simple_poll_free(mc.simple_poll);

1155

1095

1156

if(gnutls_initalized){

1096

if (gnutls_initalized){

1157

1097

gnutls_certificate_free_credentials(mc.cred);

1158

gnutls_global_deinit();

1098

gnutls_global_deinit ();

1159

1099

gnutls_dh_params_deinit(mc.dh_params);

1160

1100

}

1161

1101

1169

1109

struct dirent *direntry;

1170

1110

d = opendir(tempdir);

1171

1111

if(d == NULL){

1172

if(errno != ENOENT){

1173

perror("opendir");

1174

}

1112

perror("opendir");

1175

1113

} else {

1176

1114

while(true){

1177

1115

direntry = readdir(d);

1178

1116

if(direntry == NULL){

1179

1117

break;

1180

1118

}

1181

if(direntry->d_type == DT_REG){

1119

if (direntry->d_type == DT_REG){

1182

1120

char *fullname = NULL;

1183

1121

ret = asprintf(&fullname, "%s/%s", tempdir,

1184

1122

direntry->d_name);

1197

1135

closedir(d);

1198

1136

}

1199

1137

ret = rmdir(tempdir);

1200

if(ret == -1 and errno != ENOENT){

1138

if(ret == -1){

1201

1139

perror("rmdir");

1202

1140

}

1203

1141

}