/mandos/trunk : revision 24.1.126

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

9

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

10

*

11

* Everything else is

12

13

14

*

14

15

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

15

16

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

35

36

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

36

37

38

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

38

stdout, ferror() */

39

stdout, ferror(), sscanf */

39

40

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

40

41

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

41

42

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

47

48

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

48

49

sockaddr_in6, PF_INET6,

49

50

SOCK_STREAM, INET6_ADDRSTRLEN,

50

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

51

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

52

DIR */

51

53

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

52

54

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

53

55

struct in6_addr, inet_pton(),

54

56

connect() */

55

57

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

56

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

57

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

58

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

59

*/

60

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

58

61

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

59

62

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

60

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

63

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

61

64

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

62

65

SIOCSIFFLAGS, if_indextoname(),

63

66

if_nametoindex(), IF_NAMESIZE */

66

69

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

67

70

setgid() */

68

71

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

69

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

72

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

70

73

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

71

74

argp_state, struct argp,

72

75

argp_parse(), ARGP_KEY_ARG,

73

76

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

77

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

74

78

75

79

/* Avahi */

76

80

/* All Avahi types, constants and functions

89

93

gnutls_*

90

94

init_gnutls_session(),

91

95

GNUTLS_* */

92

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

96

#include <gnutls/openpgp.h>

97

/* gnutls_certificate_set_openpgp_key_file(),

93

98

GNUTLS_OPENPGP_FMT_BASE64 */

94

99

95

100

/* GPGME */

101

106

102

107

#define BUFFER_SIZE 256

103

108

104

/*

105

#define PATHDIR "/conf/conf.d/mandos"

106

*/

107

108

109

#define PATHDIR "/conf/conf.d/mandos"

109

110

#define SECKEY "seckey.txt"

110

111

#define PUBKEY "pubkey.txt"

111

112

113

bool debug = false;

113

114

static const char mandos_protocol_version[] = "1";

114

const char *argp_program_version = "mandos-client 1.0";

115

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

115

116

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

116

117

118

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

132

133

*/

133

134

size_t adjustbuffer(char **buffer, size_t buffer_length,

134

135

size_t buffer_capacity){

135

if (buffer_length + BUFFER_SIZE > buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

136

137

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

137

if (buffer == NULL){

138

if(buffer == NULL){

138

139

return 0;

139

140

}

140

141

buffer_capacity += BUFFER_SIZE;

159

160

int fd;

160

161

gpgme_data_t pgp_data;

161

162

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

163

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

163

164

if(fd == -1){

164

165

perror("open");

165

166

return false;

166

167

}

167

168

169

rc = gpgme_data_new_from_fd(&pgp_data, fd);

169

if (rc != GPG_ERR_NO_ERROR){

170

if(rc != GPG_ERR_NO_ERROR){

170

171

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

171

172

gpgme_strsource(rc), gpgme_strerror(rc));

172

173

return false;

173

174

}

174

175

176

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

176

if (rc != GPG_ERR_NO_ERROR){

177

if(rc != GPG_ERR_NO_ERROR){

177

178

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

178

179

gpgme_strsource(rc), gpgme_strerror(rc));

179

180

return false;

180

181

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

183

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

183

184

if(ret == -1){

184

185

perror("close");

185

186

}

187

188

return true;

188

189

}

189

190

if (debug){

191

if(debug){

191

192

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

192

193

}

193

194

195

/* Init GPGME */

195

196

gpgme_check_version(NULL);

196

197

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

197

if (rc != GPG_ERR_NO_ERROR){

198

if(rc != GPG_ERR_NO_ERROR){

198

199

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

199

200

gpgme_strsource(rc), gpgme_strerror(rc));

200

201

return false;

201

202

}

202

203

204

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

204

rc = gpgme_get_engine_info (&engine_info);

205

if (rc != GPG_ERR_NO_ERROR){

205

rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

206

207

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

207

208

gpgme_strsource(rc), gpgme_strerror(rc));

208

209

return false;

222

223

224

/* Create new GPGME "context" */

224

225

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

225

if (rc != GPG_ERR_NO_ERROR){

226

if(rc != GPG_ERR_NO_ERROR){

226

227

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

227

228

gpgme_strsource(rc), gpgme_strerror(rc));

228

229

return false;

229

230

}

230

231

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

232

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

232

233

return false;

233

234

}

234

235

239

240

* Decrypt OpenPGP data.

240

241

* Returns -1 on error

241

242

*/

242

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

243

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

244

const char *cryptotext,

245

size_t crypto_size,

246

char **plaintext){

246

247

gpgme_data_t dh_crypto, dh_plain;

247

248

gpgme_error_t rc;

248

249

ssize_t ret;

249

250

size_t plaintext_capacity = 0;

250

251

ssize_t plaintext_length = 0;

251

252

if (debug){

253

if(debug){

253

254

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

254

255

}

255

256

257

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

257

258

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

258

259

0);

259

if (rc != GPG_ERR_NO_ERROR){

260

if(rc != GPG_ERR_NO_ERROR){

260

261

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

261

262

gpgme_strsource(rc), gpgme_strerror(rc));

262

263

return -1;

264

265

266

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

266

267

rc = gpgme_data_new(&dh_plain);

267

if (rc != GPG_ERR_NO_ERROR){

268

if(rc != GPG_ERR_NO_ERROR){

268

269

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

269

270

gpgme_strsource(rc), gpgme_strerror(rc));

270

271

gpgme_data_release(dh_crypto);

274

275

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

275

276

data buffer */

276

277

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

277

if (rc != GPG_ERR_NO_ERROR){

278

if(rc != GPG_ERR_NO_ERROR){

278

279

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

279

280

gpgme_strsource(rc), gpgme_strerror(rc));

280

281

plaintext_length = -1;

281

if (debug){

282

if(debug){

282

283

gpgme_decrypt_result_t result;

283

284

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

285

if(result == NULL){

285

286

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

286

287

} else {

287

288

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

314

315

}

315

316

317

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

317

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

318

perror("pgpme_data_seek");

318

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

319

perror("gpgme_data_seek");

319

320

plaintext_length = -1;

320

321

goto decrypt_end;

321

322

}

325

326

plaintext_capacity = adjustbuffer(plaintext,

326

327

(size_t)plaintext_length,

327

328

plaintext_capacity);

328

if (plaintext_capacity == 0){

329

if(plaintext_capacity == 0){

329

330

perror("adjustbuffer");

330

331

plaintext_length = -1;

331

332

goto decrypt_end;

334

335

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

335

336

BUFFER_SIZE);

336

337

/* Print the data, if any */

337

if (ret == 0){

338

if(ret == 0){

338

339

/* EOF */

339

340

break;

340

341

}

364

365

return plaintext_length;

365

366

}

366

367

static const char * safer_gnutls_strerror (int value) {

368

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

369

if (ret == NULL)

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)

370

372

ret = "(unknown)";

371

373

return ret;

372

374

}

387

389

}

388

390

389

391

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

393

395

return -1;

394

396

}

395

397

396

if (debug){

398

if(debug){

397

399

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

398

400

* - GnuTLS manual

399

401

*/

403

405

404

406

/* OpenPGP credentials */

405

407

gnutls_certificate_allocate_credentials(&mc->cred);

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

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();

411

415

return -1;

412

416

}

413

417

420

424

ret = gnutls_certificate_set_openpgp_key_file

421

425

(mc->cred, pubkeyfilename, seckeyfilename,

422

426

GNUTLS_OPENPGP_FMT_BASE64);

423

if (ret != GNUTLS_E_SUCCESS) {

427

if(ret != GNUTLS_E_SUCCESS) {

424

428

fprintf(stderr,

425

429

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

426

430

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

431

435

432

436

/* GnuTLS server initialization */

433

437

ret = gnutls_dh_params_init(&mc->dh_params);

434

if (ret != GNUTLS_E_SUCCESS) {

435

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

436

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

438

if(ret != GNUTLS_E_SUCCESS) {

439

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

440

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

437

441

goto globalfail;

438

442

}

439

443

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

440

if (ret != GNUTLS_E_SUCCESS) {

441

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

442

safer_gnutls_strerror(ret));

444

if(ret != GNUTLS_E_SUCCESS) {

445

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

446

safer_gnutls_strerror(ret));

443

447

goto globalfail;

444

448

}

445

449

451

455

452

456

gnutls_certificate_free_credentials(mc->cred);

453

457

gnutls_global_deinit();

458

gnutls_dh_params_deinit(mc->dh_params);

454

459

return -1;

455

460

}

456

461

459

464

int ret;

460

465

/* GnuTLS session creation */

461

466

ret = gnutls_init(session, GNUTLS_SERVER);

462

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

463

468

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

464

469

safer_gnutls_strerror(ret));

465

470

}

467

472

{

468

473

const char *err;

469

474

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

470

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

471

476

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

472

477

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

473

478

safer_gnutls_strerror(ret));

474

gnutls_deinit (*session);

479

gnutls_deinit(*session);

475

480

return -1;

476

481

}

477

482

}

478

483

479

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

480

485

mc->cred);

481

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

482

487

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

483

488

safer_gnutls_strerror(ret));

484

gnutls_deinit (*session);

489

gnutls_deinit(*session);

485

490

return -1;

486

491

}

487

492

488

493

/* ignore client certificate if any. */

489

gnutls_certificate_server_set_request (*session,

490

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

491

496

492

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

493

498

494

499

return 0;

495

500

}

503

508

AvahiIfIndex if_index,

504

509

mandos_context *mc){

505

510

int ret, tcp_sd;

511

ssize_t sret;

506

512

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

507

513

char *buffer = NULL;

508

514

char *decrypted_buffer;

514

520

char interface[IF_NAMESIZE];

515

521

gnutls_session_t session;

516

522

517

ret = init_gnutls_session (mc, &session);

518

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

519

525

return -1;

520

526

}

521

527

543

549

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

544

550

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

545

551

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

546

if (ret < 0 ){

552

if(ret < 0 ){

547

553

perror("inet_pton");

548

554

return -1;

549

555

}

551

557

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

552

558

return -1;

553

559

}

554

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

560

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

561

-Wconversion and

562

-Wunreachable-code */

555

563

556

564

to.in6.sin6_scope_id = (uint32_t)if_index;

557

565

570

578

}

571

579

572

580

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

573

if (ret < 0){

581

if(ret < 0){

574

582

perror("connect");

575

583

return -1;

576

584

}

577

585

578

586

const char *out = mandos_protocol_version;

579

587

written = 0;

580

while (true){

588

while(true){

581

589

size_t out_size = strlen(out);

582

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

590

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

583

591

out_size - written));

584

if (ret == -1){

592

if(ret == -1){

585

593

perror("write");

586

594

retval = -1;

587

595

goto mandos_end;

590

598

if(written < out_size){

591

599

continue;

592

600

} else {

593

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

594

602

written = 0;

595

603

out = "\r\n";

596

604

} else {

603

611

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

604

612

}

605

613

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

607

615

608

616

do{

609

ret = gnutls_handshake (session);

617

ret = gnutls_handshake(session);

610

618

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

611

619

612

if (ret != GNUTLS_E_SUCCESS){

620

if(ret != GNUTLS_E_SUCCESS){

613

621

if(debug){

614

622

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

615

gnutls_perror (ret);

623

gnutls_perror(ret);

616

624

}

617

625

retval = -1;

618

626

goto mandos_end;

628

636

while(true){

629

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

630

638

buffer_capacity);

631

if (buffer_capacity == 0){

639

if(buffer_capacity == 0){

632

640

perror("adjustbuffer");

633

641

retval = -1;

634

642

goto mandos_end;

635

643

}

636

644

637

ret = gnutls_record_recv(session, buffer+buffer_length,

638

BUFFER_SIZE);

639

if (ret == 0){

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

640

648

break;

641

649

}

642

if (ret < 0){

643

switch(ret){

650

if(sret < 0){

651

switch(sret){

644

652

case GNUTLS_E_INTERRUPTED:

645

653

case GNUTLS_E_AGAIN:

646

654

break;

647

655

case GNUTLS_E_REHANDSHAKE:

648

656

do{

649

ret = gnutls_handshake (session);

657

ret = gnutls_handshake(session);

650

658

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

651

if (ret < 0){

659

if(ret < 0){

652

660

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

653

gnutls_perror (ret);

661

gnutls_perror(ret);

654

662

retval = -1;

655

663

goto mandos_end;

656

664

}

659

667

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

660

668

" encrypted session with Mandos server\n");

661

669

retval = -1;

662

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

663

671

goto mandos_end;

664

672

}

665

673

} else {

666

buffer_length += (size_t) ret;

674

buffer_length += (size_t) sret;

667

675

}

668

676

}

669

677

671

679

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

672

680

}

673

681

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

675

683

676

if (buffer_length > 0){

684

if(buffer_length > 0){

677

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

678

686

buffer_length,

679

687

&decrypted_buffer);

680

if (decrypted_buffer_size >= 0){

688

if(decrypted_buffer_size >= 0){

681

689

written = 0;

682

690

while(written < (size_t) decrypted_buffer_size){

683

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

684

(size_t)decrypted_buffer_size - written,

685

stdout);

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

686

694

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

687

695

if(debug){

688

696

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

705

713

706

714

mandos_end:

707

715

free(buffer);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

716

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

709

717

if(ret == -1){

710

718

perror("close");

711

719

}

712

gnutls_deinit (session);

720

gnutls_deinit(session);

713

721

return retval;

714

722

}

715

723

733

741

/* Called whenever a service has been resolved successfully or

734

742

timed out */

735

743

736

switch (event) {

744

switch(event) {

737

745

default:

738

746

case AVAHI_RESOLVER_FAILURE:

739

747

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

747

755

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

748

756

if(debug){

749

757

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

750

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

751

interface, port);

758

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

759

ip, (intmax_t)interface, port);

752

760

}

753

761

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

754

if (ret == 0){

762

if(ret == 0){

755

763

avahi_simple_poll_quit(mc->simple_poll);

756

764

}

757

765

}

775

783

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

776

784

is removed from the LAN */

777

785

778

switch (event) {

786

switch(event) {

779

787

default:

780

788

case AVAHI_BROWSER_FAILURE:

781

789

790

798

the callback function is called the Avahi server will free the

791

799

resolver for us. */

792

800

793

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

801

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

794

802

protocol, name, type, domain,

795

803

AVAHI_PROTO_INET6, 0,

796

804

resolve_callback, mc)))

814

822

AvahiSServiceBrowser *sb = NULL;

815

823

int error;

816

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

817

827

int exitcode = EXIT_SUCCESS;

818

828

const char *interface = "eth0";

819

829

struct ifreq network;

830

840

.dh_bits = 1024, .priority = "SECURE256"

831

841

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

832

842

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

843

bool gpgme_initalized = false;

844

double delay = 2.5;

834

845

835

846

{

836

847

struct argp_option options[] = {

862

873

.arg = "STRING",

863

874

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

864

875

.group = 1 },

876

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

877

.arg = "SECONDS",

878

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

879

.group = 2 },

865

880

{ .name = NULL }

866

881

};

867

882

868

error_t parse_opt (int key, char *arg,

869

struct argp_state *state) {

870

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

871

a pointer to our plugin list pointer. */

872

switch (key) {

883

error_t parse_opt(int key, char *arg,

884

struct argp_state *state) {

885

switch(key) {

873

886

case 128: /* --debug */

874

887

debug = true;

875

888

break;

886

899

pubkey = arg;

887

900

break;

888

901

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

889

errno = 0;

890

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

891

if (errno){

892

perror("strtol");

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");

893

906

exit(EXIT_FAILURE);

894

907

}

908

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

895

909

break;

896

910

case 130: /* --priority */

897

911

mc.priority = arg;

898

912

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;

899

920

case ARGP_KEY_ARG:

900

argp_usage (state);

921

argp_usage(state);

901

922

case ARGP_KEY_END:

902

923

break;

903

924

default:

910

931

.args_doc = "",

911

932

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

912

933

" passwords from a Mandos server" };

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

934

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

935

if(ret == ARGP_ERR_UNKNOWN){

915

936

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

916

937

exitcode = EXIT_FAILURE;

917

938

goto end;

920

941

921

942

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

922

943

{

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

923

951

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

924

952

if(sd < 0) {

925

953

perror("socket");

926

954

exitcode = EXIT_FAILURE;

955

ret = klogctl(7, NULL, 0);

956

if(ret == -1){

957

perror("klogctl");

958

}

927

959

goto end;

928

960

}

929

961

strcpy(network.ifr_name, interface);

930

962

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

931

963

if(ret == -1){

932

964

perror("ioctl SIOCGIFFLAGS");

965

ret = klogctl(7, NULL, 0);

966

if(ret == -1){

967

perror("klogctl");

968

}

933

969

exitcode = EXIT_FAILURE;

934

970

goto end;

935

971

}

939

975

if(ret == -1){

940

976

perror("ioctl SIOCSIFFLAGS");

941

977

exitcode = EXIT_FAILURE;

978

ret = klogctl(7, NULL, 0);

979

if(ret == -1){

980

perror("klogctl");

981

}

942

982

goto end;

943

983

}

944

984

}

945

ret = TEMP_FAILURE_RETRY(close(sd));

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));

946

997

if(ret == -1){

947

998

perror("close");

948

999

}

1000

// Restores kernel loglevel to default

1001

ret = klogctl(7, NULL, 0);

1002

if(ret == -1){

1003

perror("klogctl");

1004

}

949

1005

}

950

1006

951

1007

uid = getuid();

952

1008

gid = getgid();

953

1009

954

1010

ret = setuid(uid);

955

if (ret == -1){

1011

if(ret == -1){

956

1012

perror("setuid");

957

1013

}

958

1014

959

1015

setgid(gid);

960

if (ret == -1){

1016

if(ret == -1){

961

1017

perror("setgid");

962

1018

}

963

1019

964

1020

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

965

if (ret == -1){

1021

if(ret == -1){

966

1022

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

967

1023

exitcode = EXIT_FAILURE;

968

1024

goto end;

977

1033

}

978

1034

979

1035

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

980

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

1036

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

981

1037

exitcode = EXIT_FAILURE;

982

1038

goto end;

983

1039

} else {

984

pgpme_initalized = true;

1040

gpgme_initalized = true;

985

1041

}

986

1042

987

1043

if_index = (AvahiIfIndex) if_nametoindex(interface);

999

1055

exitcode = EXIT_FAILURE;

1000

1056

goto end;

1001

1057

}

1002

errno = 0;

1003

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

1004

if(errno){

1005

perror("Bad port number");

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");

1006

1063

exitcode = EXIT_FAILURE;

1007

1064

goto end;

1008

1065

}

1066

port = (uint16_t)tmpmax;

1009

1067

*address = '\0';

1010

1068

address = connect_to;

1011

1069

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

1017

1075

goto end;

1018

1076

}

1019

1077

1020

if (not debug){

1078

if(not debug){

1021

1079

avahi_set_log_function(empty_log);

1022

1080

}

1023

1081

1026

1084

1027

1085

/* Allocate main Avahi loop object */

1028

1086

mc.simple_poll = avahi_simple_poll_new();

1029

if (mc.simple_poll == NULL) {

1087

if(mc.simple_poll == NULL) {

1030

1088

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

1031

1089

" object.\n");

1032

1090

exitcode = EXIT_FAILURE;

1052

1110

}

1053

1111

1054

1112

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

1055

if (mc.server == NULL) {

1113

if(mc.server == NULL) {

1056

1114

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

1057

1115

avahi_strerror(error));

1058

1116

exitcode = EXIT_FAILURE;

1064

1122

AVAHI_PROTO_INET6,

1065

1123

"_mandos._tcp", NULL, 0,

1066

1124

browse_callback, &mc);

1067

if (sb == NULL) {

1125

if(sb == NULL) {

1068

1126

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

1069

1127

avahi_strerror(avahi_server_errno(mc.server)));

1070

1128

exitcode = EXIT_FAILURE;

1073

1131

1074

1132

/* Run the main loop */

1075

1133

1076

if (debug){

1134

if(debug){

1077

1135

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

1078

1136

}

1079

1137

1080

1138

avahi_simple_poll_loop(mc.simple_poll);

1081

1139

1082

1140

end:

1083

1141

1084

if (debug){

1142

if(debug){

1085

1143

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

1086

1144

}

1087

1145

1088

1146

/* Cleanup things */

1089

if (sb != NULL)

1147

if(sb != NULL)

1090

1148

avahi_s_service_browser_free(sb);

1091

1149

1092

if (mc.server != NULL)

1150

if(mc.server != NULL)

1093

1151

avahi_server_free(mc.server);

1094

1152

1095

if (mc.simple_poll != NULL)

1153

if(mc.simple_poll != NULL)

1096

1154

avahi_simple_poll_free(mc.simple_poll);

1097

1155

1098

if (gnutls_initalized){

1156

if(gnutls_initalized){

1099

1157

gnutls_certificate_free_credentials(mc.cred);

1100

gnutls_global_deinit ();

1158

gnutls_global_deinit();

1159

gnutls_dh_params_deinit(mc.dh_params);

1101

1160

}

1102

1161

1103

if(pgpme_initalized){

1162

if(gpgme_initalized){

1104

1163

gpgme_release(mc.ctx);

1105

1164

}

1106

1165

1110

1169

struct dirent *direntry;

1111

1170

d = opendir(tempdir);

1112

1171

if(d == NULL){

1113

perror("opendir");

1172

if(errno != ENOENT){

1173

perror("opendir");

1174

}

1114

1175

} else {

1115

1176

while(true){

1116

1177

direntry = readdir(d);

1117

1178

if(direntry == NULL){

1118

1179

break;

1119

1180

}

1120

if (direntry->d_type == DT_REG){

1181

if(direntry->d_type == DT_REG){

1121

1182

char *fullname = NULL;

1122

1183

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

1123

1184

direntry->d_name);

1133

1194

free(fullname);

1134

1195

}

1135

1196

}

1197

closedir(d);

1136

1198

}

1137

1199

ret = rmdir(tempdir);

1138

if(ret == -1){

1200

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

1139

1201

perror("rmdir");

1140

1202

}

1141

1203

}