/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

36

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

37

38

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

39

stdout, ferror() */

39

stdout, ferror(), sscanf */

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(), DIR */

51

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

52

DIR */

52

53

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

53

54

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

54

55

struct in6_addr, inet_pton(),

55

56

connect() */

56

57

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

57

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

58

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

58

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

59

*/

60

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

59

61

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

60

62

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

61

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

63

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

62

64

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

63

65

SIOCSIFFLAGS, if_indextoname(),

64

66

if_nametoindex(), IF_NAMESIZE */

67

69

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

68

70

setgid() */

69

71

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

70

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

72

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

71

73

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

72

74

argp_state, struct argp,

73

75

argp_parse(), ARGP_KEY_ARG,

74

76

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

77

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

75

78

76

79

/* Avahi */

77

80

/* All Avahi types, constants and functions

90

93

gnutls_*

91

94

init_gnutls_session(),

92

95

GNUTLS_* */

93

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

96

#include <gnutls/openpgp.h>

97

/* gnutls_certificate_set_openpgp_key_file(),

94

98

GNUTLS_OPENPGP_FMT_BASE64 */

95

99

96

100

/* GPGME */

129

133

*/

130

134

size_t adjustbuffer(char **buffer, size_t buffer_length,

131

135

size_t buffer_capacity){

132

if (buffer_length + BUFFER_SIZE > buffer_capacity){

136

if(buffer_length + BUFFER_SIZE > buffer_capacity){

133

137

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

134

if (buffer == NULL){

138

if(buffer == NULL){

135

139

return 0;

136

140

}

137

141

buffer_capacity += BUFFER_SIZE;

163

167

}

164

168

165

169

rc = gpgme_data_new_from_fd(&pgp_data, fd);

166

if (rc != GPG_ERR_NO_ERROR){

170

if(rc != GPG_ERR_NO_ERROR){

167

171

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

168

172

gpgme_strsource(rc), gpgme_strerror(rc));

169

173

return false;

170

174

}

171

175

172

176

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

173

if (rc != GPG_ERR_NO_ERROR){

177

if(rc != GPG_ERR_NO_ERROR){

174

178

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

175

179

gpgme_strsource(rc), gpgme_strerror(rc));

176

180

return false;

184

188

return true;

185

189

}

186

190

187

if (debug){

191

if(debug){

188

192

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

189

193

}

190

194

191

195

/* Init GPGME */

192

196

gpgme_check_version(NULL);

193

197

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

194

if (rc != GPG_ERR_NO_ERROR){

198

if(rc != GPG_ERR_NO_ERROR){

195

199

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

196

200

gpgme_strsource(rc), gpgme_strerror(rc));

197

201

return false;

198

202

}

199

203

200

204

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

201

rc = gpgme_get_engine_info (&engine_info);

202

if (rc != GPG_ERR_NO_ERROR){

205

rc = gpgme_get_engine_info(&engine_info);

206

if(rc != GPG_ERR_NO_ERROR){

203

207

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

204

208

gpgme_strsource(rc), gpgme_strerror(rc));

205

209

return false;

219

223

220

224

/* Create new GPGME "context" */

221

225

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

222

if (rc != GPG_ERR_NO_ERROR){

226

if(rc != GPG_ERR_NO_ERROR){

223

227

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

224

228

gpgme_strsource(rc), gpgme_strerror(rc));

225

229

return false;

226

230

}

227

231

228

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

232

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

229

233

return false;

230

234

}

231

235

236

240

* Decrypt OpenPGP data.

237

241

* Returns -1 on error

238

242

*/

239

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

240

const char *cryptotext,

241

size_t crypto_size,

242

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){

243

247

gpgme_data_t dh_crypto, dh_plain;

244

248

gpgme_error_t rc;

245

249

ssize_t ret;

246

250

size_t plaintext_capacity = 0;

247

251

ssize_t plaintext_length = 0;

248

252

249

if (debug){

253

if(debug){

250

254

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

251

255

}

252

256

253

257

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

254

258

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

255

259

0);

256

if (rc != GPG_ERR_NO_ERROR){

260

if(rc != GPG_ERR_NO_ERROR){

257

261

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

258

262

gpgme_strsource(rc), gpgme_strerror(rc));

259

263

return -1;

261

265

262

266

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

263

267

rc = gpgme_data_new(&dh_plain);

264

if (rc != GPG_ERR_NO_ERROR){

268

if(rc != GPG_ERR_NO_ERROR){

265

269

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

266

270

gpgme_strsource(rc), gpgme_strerror(rc));

267

271

gpgme_data_release(dh_crypto);

271

275

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

272

276

data buffer */

273

277

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

274

if (rc != GPG_ERR_NO_ERROR){

278

if(rc != GPG_ERR_NO_ERROR){

275

279

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

276

280

gpgme_strsource(rc), gpgme_strerror(rc));

277

281

plaintext_length = -1;

278

if (debug){

282

if(debug){

279

283

gpgme_decrypt_result_t result;

280

284

result = gpgme_op_decrypt_result(mc->ctx);

281

if (result == NULL){

285

if(result == NULL){

282

286

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

283

287

} else {

284

288

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

311

315

}

312

316

313

317

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

314

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

318

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

315

319

perror("gpgme_data_seek");

316

320

plaintext_length = -1;

317

321

goto decrypt_end;

322

326

plaintext_capacity = adjustbuffer(plaintext,

323

327

(size_t)plaintext_length,

324

328

plaintext_capacity);

325

if (plaintext_capacity == 0){

329

if(plaintext_capacity == 0){

326

330

perror("adjustbuffer");

327

331

plaintext_length = -1;

328

332

goto decrypt_end;

331

335

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

332

336

BUFFER_SIZE);

333

337

/* Print the data, if any */

334

if (ret == 0){

338

if(ret == 0){

335

339

/* EOF */

336

340

break;

337

341

}

361

365

return plaintext_length;

362

366

}

363

367

364

static const char * safer_gnutls_strerror (int value) {

365

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

366

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)

367

372

ret = "(unknown)";

368

373

return ret;

369

374

}

384

389

}

385

390

386

391

ret = gnutls_global_init();

387

if (ret != GNUTLS_E_SUCCESS) {

388

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

389

safer_gnutls_strerror(ret));

392

if(ret != GNUTLS_E_SUCCESS) {

393

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

394

safer_gnutls_strerror(ret));

390

395

return -1;

391

396

}

392

397

393

if (debug){

398

if(debug){

394

399

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

395

400

* - GnuTLS manual

396

401

*/

400

405

401

406

/* OpenPGP credentials */

402

407

gnutls_certificate_allocate_credentials(&mc->cred);

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 ();

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();

408

415

return -1;

409

416

}

410

417

424

ret = gnutls_certificate_set_openpgp_key_file

418

425

(mc->cred, pubkeyfilename, seckeyfilename,

419

426

GNUTLS_OPENPGP_FMT_BASE64);

420

if (ret != GNUTLS_E_SUCCESS) {

427

if(ret != GNUTLS_E_SUCCESS) {

421

428

fprintf(stderr,

422

429

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

423

430

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

428

435

429

436

/* GnuTLS server initialization */

430

437

ret = gnutls_dh_params_init(&mc->dh_params);

431

if (ret != GNUTLS_E_SUCCESS) {

432

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

433

" %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));

434

441

goto globalfail;

435

442

}

436

443

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

437

if (ret != GNUTLS_E_SUCCESS) {

438

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

439

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));

440

447

goto globalfail;

441

448

}

442

449

457

464

int ret;

458

465

/* GnuTLS session creation */

459

466

ret = gnutls_init(session, GNUTLS_SERVER);

460

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

461

468

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

462

469

safer_gnutls_strerror(ret));

463

470

}

465

472

{

466

473

const char *err;

467

474

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

468

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

469

476

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

470

477

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

471

478

safer_gnutls_strerror(ret));

472

gnutls_deinit (*session);

479

gnutls_deinit(*session);

473

480

return -1;

474

481

}

475

482

}

476

483

477

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

478

485

mc->cred);

479

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

480

487

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

481

488

safer_gnutls_strerror(ret));

482

gnutls_deinit (*session);

489

gnutls_deinit(*session);

483

490

return -1;

484

491

}

485

492

486

493

/* ignore client certificate if any. */

487

gnutls_certificate_server_set_request (*session,

488

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

489

496

490

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

491

498

492

499

return 0;

493

500

}

513

520

char interface[IF_NAMESIZE];

514

521

gnutls_session_t session;

515

522

516

ret = init_gnutls_session (mc, &session);

517

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

518

525

return -1;

519

526

}

520

527

542

549

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

543

550

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

544

551

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

545

if (ret < 0 ){

552

if(ret < 0 ){

546

553

perror("inet_pton");

547

554

return -1;

548

555

}

550

557

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

551

558

return -1;

552

559

}

553

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

560

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

561

-Wconversion and

562

-Wunreachable-code */

554

563

555

564

to.in6.sin6_scope_id = (uint32_t)if_index;

556

565

569

578

}

570

579

571

580

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

572

if (ret < 0){

581

if(ret < 0){

573

582

perror("connect");

574

583

return -1;

575

584

}

576

585

577

586

const char *out = mandos_protocol_version;

578

587

written = 0;

579

while (true){

588

while(true){

580

589

size_t out_size = strlen(out);

581

590

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

582

591

out_size - written));

583

if (ret == -1){

592

if(ret == -1){

584

593

perror("write");

585

594

retval = -1;

586

595

goto mandos_end;

589

598

if(written < out_size){

590

599

continue;

591

600

} else {

592

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

593

602

written = 0;

594

603

out = "\r\n";

595

604

} else {

602

611

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

603

612

}

604

613

605

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

606

615

607

616

do{

608

ret = gnutls_handshake (session);

617

ret = gnutls_handshake(session);

609

618

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

610

619

611

if (ret != GNUTLS_E_SUCCESS){

620

if(ret != GNUTLS_E_SUCCESS){

612

621

if(debug){

613

622

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

614

gnutls_perror (ret);

623

gnutls_perror(ret);

615

624

}

616

625

retval = -1;

617

626

goto mandos_end;

627

636

while(true){

628

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

629

638

buffer_capacity);

630

if (buffer_capacity == 0){

639

if(buffer_capacity == 0){

631

640

perror("adjustbuffer");

632

641

retval = -1;

633

642

goto mandos_end;

635

644

636

645

sret = gnutls_record_recv(session, buffer+buffer_length,

637

646

BUFFER_SIZE);

638

if (sret == 0){

647

if(sret == 0){

639

648

break;

640

649

}

641

if (sret < 0){

650

if(sret < 0){

642

651

switch(sret){

643

652

case GNUTLS_E_INTERRUPTED:

644

653

case GNUTLS_E_AGAIN:

645

654

break;

646

655

case GNUTLS_E_REHANDSHAKE:

647

656

do{

648

ret = gnutls_handshake (session);

657

ret = gnutls_handshake(session);

649

658

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

650

if (ret < 0){

659

if(ret < 0){

651

660

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

652

gnutls_perror (ret);

661

gnutls_perror(ret);

653

662

retval = -1;

654

663

goto mandos_end;

655

664

}

658

667

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

659

668

" encrypted session with Mandos server\n");

660

669

retval = -1;

661

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

662

671

goto mandos_end;

663

672

}

664

673

} else {

670

679

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

671

680

}

672

681

673

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

674

683

675

if (buffer_length > 0){

684

if(buffer_length > 0){

676

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

677

686

buffer_length,

678

687

&decrypted_buffer);

679

if (decrypted_buffer_size >= 0){

688

if(decrypted_buffer_size >= 0){

680

689

written = 0;

681

690

while(written < (size_t) decrypted_buffer_size){

682

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

683

(size_t)decrypted_buffer_size - written,

684

stdout);

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

685

694

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

686

695

if(debug){

687

696

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

708

717

if(ret == -1){

709

718

perror("close");

710

719

}

711

gnutls_deinit (session);

720

gnutls_deinit(session);

712

721

return retval;

713

722

}

714

723

732

741

/* Called whenever a service has been resolved successfully or

733

742

timed out */

734

743

735

switch (event) {

744

switch(event) {

736

745

default:

737

746

case AVAHI_RESOLVER_FAILURE:

738

747

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

746

755

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

747

756

if(debug){

748

757

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

749

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

750

interface, port);

758

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

759

ip, (intmax_t)interface, port);

751

760

}

752

761

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

753

if (ret == 0){

762

if(ret == 0){

754

763

avahi_simple_poll_quit(mc->simple_poll);

755

764

}

756

765

}

774

783

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

775

784

is removed from the LAN */

776

785

777

switch (event) {

786

switch(event) {

778

787

default:

779

788

case AVAHI_BROWSER_FAILURE:

780

789

798

the callback function is called the Avahi server will free the

790

799

resolver for us. */

791

800

792

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

801

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

793

802

protocol, name, type, domain,

794

803

AVAHI_PROTO_INET6, 0,

795

804

resolve_callback, mc)))

813

822

AvahiSServiceBrowser *sb = NULL;

814

823

int error;

815

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

816

827

int exitcode = EXIT_SUCCESS;

817

828

const char *interface = "eth0";

818

829

struct ifreq network;

830

841

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

831

842

bool gnutls_initalized = false;

832

843

bool gpgme_initalized = false;

844

double delay = 2.5;

833

845

834

846

{

835

847

struct argp_option options[] = {

861

873

.arg = "STRING",

862

874

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

863

875

.group = 1 },

876

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

877

.arg = "SECONDS",

878

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

879

.group = 2 },

864

880

{ .name = NULL }

865

881

};

866

882

867

error_t parse_opt (int key, char *arg,

868

struct argp_state *state) {

869

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

870

a pointer to our plugin list pointer. */

871

switch (key) {

883

error_t parse_opt(int key, char *arg,

884

struct argp_state *state) {

885

switch(key) {

872

886

case 128: /* --debug */

873

887

debug = true;

874

888

break;

885

899

pubkey = arg;

886

900

break;

887

901

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

888

errno = 0;

889

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

890

if (errno){

891

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");

892

906

exit(EXIT_FAILURE);

893

907

}

908

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

894

909

break;

895

910

case 130: /* --priority */

896

911

mc.priority = arg;

897

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;

898

920

case ARGP_KEY_ARG:

899

argp_usage (state);

921

argp_usage(state);

900

922

case ARGP_KEY_END:

901

923

break;

902

924

default:

909

931

.args_doc = "",

910

932

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

911

933

" passwords from a Mandos server" };

912

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

913

if (ret == ARGP_ERR_UNKNOWN){

934

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

935

if(ret == ARGP_ERR_UNKNOWN){

914

936

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

915

937

exitcode = EXIT_FAILURE;

916

938

goto end;

919

941

920

942

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

921

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

922

951

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

923

952

if(sd < 0) {

924

953

perror("socket");

925

954

exitcode = EXIT_FAILURE;

955

ret = klogctl(7, NULL, 0);

956

if(ret == -1){

957

perror("klogctl");

958

}

926

959

goto end;

927

960

}

928

961

strcpy(network.ifr_name, interface);

929

962

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

930

963

if(ret == -1){

931

964

perror("ioctl SIOCGIFFLAGS");

965

ret = klogctl(7, NULL, 0);

966

if(ret == -1){

967

perror("klogctl");

968

}

932

969

exitcode = EXIT_FAILURE;

933

970

goto end;

934

971

}

938

975

if(ret == -1){

939

976

perror("ioctl SIOCSIFFLAGS");

940

977

exitcode = EXIT_FAILURE;

978

ret = klogctl(7, NULL, 0);

979

if(ret == -1){

980

perror("klogctl");

981

}

941

982

goto end;

942

983

}

943

984

}

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

}

944

996

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

945

997

if(ret == -1){

946

998

perror("close");

947

999

}

1000

// Restores kernel loglevel to default

1001

ret = klogctl(7, NULL, 0);

1002

if(ret == -1){

1003

perror("klogctl");

1004

}

948

1005

}

949

1006

950

1007

uid = getuid();

951

1008

gid = getgid();

952

1009

953

1010

ret = setuid(uid);

954

if (ret == -1){

1011

if(ret == -1){

955

1012

perror("setuid");

956

1013

}

957

1014

958

1015

setgid(gid);

959

if (ret == -1){

1016

if(ret == -1){

960

1017

perror("setgid");

961

1018

}

962

1019

963

1020

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

964

if (ret == -1){

1021

if(ret == -1){

965

1022

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

966

1023

exitcode = EXIT_FAILURE;

967

1024

goto end;

998

1055

exitcode = EXIT_FAILURE;

999

1056

goto end;

1000

1057

}

1001

errno = 0;

1002

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

1003

if(errno){

1004

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");

1005

1063

exitcode = EXIT_FAILURE;

1006

1064

goto end;

1007

1065

}

1066

port = (uint16_t)tmpmax;

1008

1067

*address = '\0';

1009

1068

address = connect_to;

1010

1069

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

1016

1075

goto end;

1017

1076

}

1018

1077

1019

if (not debug){

1078

if(not debug){

1020

1079

avahi_set_log_function(empty_log);

1021

1080

}

1022

1081

1025

1084

1026

1085

/* Allocate main Avahi loop object */

1027

1086

mc.simple_poll = avahi_simple_poll_new();

1028

if (mc.simple_poll == NULL) {

1087

if(mc.simple_poll == NULL) {

1029

1088

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

1030

1089

" object.\n");

1031

1090

exitcode = EXIT_FAILURE;

1051

1110

}

1052

1111

1053

1112

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

1054

if (mc.server == NULL) {

1113

if(mc.server == NULL) {

1055

1114

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

1056

1115

avahi_strerror(error));

1057

1116

exitcode = EXIT_FAILURE;

1063

1122

AVAHI_PROTO_INET6,

1064

1123

"_mandos._tcp", NULL, 0,

1065

1124

browse_callback, &mc);

1066

if (sb == NULL) {

1125

if(sb == NULL) {

1067

1126

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

1068

1127

avahi_strerror(avahi_server_errno(mc.server)));

1069

1128

exitcode = EXIT_FAILURE;

1072

1131

1073

1132

/* Run the main loop */

1074

1133

1075

if (debug){

1134

if(debug){

1076

1135

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

1077

1136

}

1078

1137

1079

1138

avahi_simple_poll_loop(mc.simple_poll);

1080

1139

1081

1140

end:

1082

1141

1083

if (debug){

1142

if(debug){

1084

1143

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

1085

1144

}

1086

1145

1087

1146

/* Cleanup things */

1088

if (sb != NULL)

1147

if(sb != NULL)

1089

1148

avahi_s_service_browser_free(sb);

1090

1149

1091

if (mc.server != NULL)

1150

if(mc.server != NULL)

1092

1151

avahi_server_free(mc.server);

1093

1152

1094

if (mc.simple_poll != NULL)

1153

if(mc.simple_poll != NULL)

1095

1154

avahi_simple_poll_free(mc.simple_poll);

1096

1155

1097

if (gnutls_initalized){

1156

if(gnutls_initalized){

1098

1157

gnutls_certificate_free_credentials(mc.cred);

1099

gnutls_global_deinit ();

1158

gnutls_global_deinit();

1100

1159

gnutls_dh_params_deinit(mc.dh_params);

1101

1160

}

1102

1161

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);

1136

1197

closedir(d);

1137

1198

}

1138

1199

ret = rmdir(tempdir);

1139

if(ret == -1){

1200

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

1140

1201

perror("rmdir");

1141

1202

}

1142

1203

}