/mandos/trunk : revision 287

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(),

40

remove() */

39

41

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

40

42

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

41

43

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

47

49

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

48

50

sockaddr_in6, PF_INET6,

49

51

SOCK_STREAM, INET6_ADDRSTRLEN,

50

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

52

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

53

DIR */

51

54

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

52

55

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

53

56

struct in6_addr, inet_pton(),

54

57

connect() */

55

58

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

56

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

57

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

59

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

60

*/

61

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

58

62

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

59

63

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

60

64

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

66

70

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

67

71

setgid() */

68

72

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

69

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

73

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

70

74

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

71

75

argp_state, struct argp,

72

76

argp_parse(), ARGP_KEY_ARG,

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

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

318

319

perror("gpgme_data_seek");

319

320

plaintext_length = -1;

320

321

goto decrypt_end;

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

460

464

int ret;

461

465

/* GnuTLS session creation */

462

466

ret = gnutls_init(session, GNUTLS_SERVER);

463

if (ret != GNUTLS_E_SUCCESS){

467

if(ret != GNUTLS_E_SUCCESS){

464

468

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

465

469

safer_gnutls_strerror(ret));

466

470

}

468

472

{

469

473

const char *err;

470

474

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

471

if (ret != GNUTLS_E_SUCCESS) {

475

if(ret != GNUTLS_E_SUCCESS) {

472

476

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

473

477

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

474

478

safer_gnutls_strerror(ret));

475

gnutls_deinit (*session);

479

gnutls_deinit(*session);

476

480

return -1;

477

481

}

478

482

}

479

483

480

484

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

481

485

mc->cred);

482

if (ret != GNUTLS_E_SUCCESS) {

486

if(ret != GNUTLS_E_SUCCESS) {

483

487

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

484

488

safer_gnutls_strerror(ret));

485

gnutls_deinit (*session);

489

gnutls_deinit(*session);

486

490

return -1;

487

491

}

488

492

489

493

/* ignore client certificate if any. */

490

gnutls_certificate_server_set_request (*session,

491

GNUTLS_CERT_IGNORE);

494

gnutls_certificate_server_set_request(*session,

495

GNUTLS_CERT_IGNORE);

492

496

493

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

497

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

494

498

495

499

return 0;

496

500

}

504

508

AvahiIfIndex if_index,

505

509

mandos_context *mc){

506

510

int ret, tcp_sd;

511

ssize_t sret;

507

512

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

508

513

char *buffer = NULL;

509

514

char *decrypted_buffer;

515

520

char interface[IF_NAMESIZE];

516

521

gnutls_session_t session;

517

522

518

ret = init_gnutls_session (mc, &session);

519

if (ret != 0){

523

ret = init_gnutls_session(mc, &session);

524

if(ret != 0){

520

525

return -1;

521

526

}

522

527

544

549

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

545

550

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

546

551

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

547

if (ret < 0 ){

552

if(ret < 0 ){

548

553

perror("inet_pton");

549

554

return -1;

550

555

}

552

557

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

553

558

return -1;

554

559

}

555

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

560

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

561

-Wconversion and

562

-Wunreachable-code */

556

563

557

564

to.in6.sin6_scope_id = (uint32_t)if_index;

558

565

571

578

}

572

579

573

580

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

574

if (ret < 0){

581

if(ret < 0){

575

582

perror("connect");

576

583

return -1;

577

584

}

578

585

579

586

const char *out = mandos_protocol_version;

580

587

written = 0;

581

while (true){

588

while(true){

582

589

size_t out_size = strlen(out);

583

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

590

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

584

591

out_size - written));

585

if (ret == -1){

592

if(ret == -1){

586

593

perror("write");

587

594

retval = -1;

588

595

goto mandos_end;

591

598

if(written < out_size){

592

599

continue;

593

600

} else {

594

if (out == mandos_protocol_version){

601

if(out == mandos_protocol_version){

595

602

written = 0;

596

603

out = "\r\n";

597

604

} else {

604

611

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

605

612

}

606

613

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

614

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

608

615

609

616

do{

610

ret = gnutls_handshake (session);

617

ret = gnutls_handshake(session);

611

618

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

612

619

613

if (ret != GNUTLS_E_SUCCESS){

620

if(ret != GNUTLS_E_SUCCESS){

614

621

if(debug){

615

622

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

616

gnutls_perror (ret);

623

gnutls_perror(ret);

617

624

}

618

625

retval = -1;

619

626

goto mandos_end;

629

636

while(true){

630

637

buffer_capacity = adjustbuffer(&buffer, buffer_length,

631

638

buffer_capacity);

632

if (buffer_capacity == 0){

639

if(buffer_capacity == 0){

633

640

perror("adjustbuffer");

634

641

retval = -1;

635

642

goto mandos_end;

636

643

}

637

644

638

ret = gnutls_record_recv(session, buffer+buffer_length,

639

BUFFER_SIZE);

640

if (ret == 0){

645

sret = gnutls_record_recv(session, buffer+buffer_length,

646

BUFFER_SIZE);

647

if(sret == 0){

641

648

break;

642

649

}

643

if (ret < 0){

644

switch(ret){

650

if(sret < 0){

651

switch(sret){

645

652

case GNUTLS_E_INTERRUPTED:

646

653

case GNUTLS_E_AGAIN:

647

654

break;

648

655

case GNUTLS_E_REHANDSHAKE:

649

656

do{

650

ret = gnutls_handshake (session);

657

ret = gnutls_handshake(session);

651

658

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

652

if (ret < 0){

659

if(ret < 0){

653

660

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

654

gnutls_perror (ret);

661

gnutls_perror(ret);

655

662

retval = -1;

656

663

goto mandos_end;

657

664

}

660

667

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

661

668

" encrypted session with Mandos server\n");

662

669

retval = -1;

663

gnutls_bye (session, GNUTLS_SHUT_RDWR);

670

gnutls_bye(session, GNUTLS_SHUT_RDWR);

664

671

goto mandos_end;

665

672

}

666

673

} else {

667

buffer_length += (size_t) ret;

674

buffer_length += (size_t) sret;

668

675

}

669

676

}

670

677

672

679

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

673

680

}

674

681

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

682

gnutls_bye(session, GNUTLS_SHUT_RDWR);

676

683

677

if (buffer_length > 0){

684

if(buffer_length > 0){

678

685

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

679

686

buffer_length,

680

687

&decrypted_buffer);

681

if (decrypted_buffer_size >= 0){

688

if(decrypted_buffer_size >= 0){

682

689

written = 0;

683

690

while(written < (size_t) decrypted_buffer_size){

684

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

685

(size_t)decrypted_buffer_size - written,

686

stdout);

691

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

692

(size_t)decrypted_buffer_size - written,

693

stdout);

687

694

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

688

695

if(debug){

689

696

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

706

713

707

714

mandos_end:

708

715

free(buffer);

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

716

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

710

717

if(ret == -1){

711

718

perror("close");

712

719

}

713

gnutls_deinit (session);

720

gnutls_deinit(session);

714

721

return retval;

715

722

}

716

723

734

741

/* Called whenever a service has been resolved successfully or

735

742

timed out */

736

743

737

switch (event) {

744

switch(event) {

738

745

default:

739

746

case AVAHI_RESOLVER_FAILURE:

740

747

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

748

755

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

749

756

if(debug){

750

757

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

751

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

752

interface, port);

758

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

759

ip, (intmax_t)interface, port);

753

760

}

754

761

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

755

if (ret == 0){

762

if(ret == 0){

756

763

avahi_simple_poll_quit(mc->simple_poll);

757

764

}

758

765

}

776

783

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

777

784

is removed from the LAN */

778

785

779

switch (event) {

786

switch(event) {

780

787

default:

781

788

case AVAHI_BROWSER_FAILURE:

782

789

791

798

the callback function is called the Avahi server will free the

792

799

resolver for us. */

793

800

794

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

801

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

795

802

protocol, name, type, domain,

796

803

AVAHI_PROTO_INET6, 0,

797

804

resolve_callback, mc)))

815

822

AvahiSServiceBrowser *sb = NULL;

816

823

int error;

817

824

int ret;

825

intmax_t tmpmax;

826

int numchars;

818

827

int exitcode = EXIT_SUCCESS;

819

828

const char *interface = "eth0";

820

829

struct ifreq network;

830

839

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

831

840

.dh_bits = 1024, .priority = "SECURE256"

832

841

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

833

bool gnutls_initalized = false;

834

bool gpgme_initalized = false;

842

bool gnutls_initialized = false;

843

bool gpgme_initialized = false;

835

844

836

845

{

837

846

struct argp_option options[] = {

866

875

{ .name = NULL }

867

876

};

868

877

869

error_t parse_opt (int key, char *arg,

870

struct argp_state *state) {

871

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

872

a pointer to our plugin list pointer. */

873

switch (key) {

878

error_t parse_opt(int key, char *arg,

879

struct argp_state *state) {

880

switch(key) {

874

881

case 128: /* --debug */

875

882

debug = true;

876

883

break;

887

894

pubkey = arg;

888

895

break;

889

896

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

890

errno = 0;

891

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

892

if (errno){

893

perror("strtol");

897

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

898

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

899

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

900

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

894

901

exit(EXIT_FAILURE);

895

902

}

903

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

896

904

break;

897

905

case 130: /* --priority */

898

906

mc.priority = arg;

899

907

break;

900

908

case ARGP_KEY_ARG:

901

argp_usage (state);

909

argp_usage(state);

902

910

case ARGP_KEY_END:

903

911

break;

904

912

default:

911

919

.args_doc = "",

912

920

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

913

921

" passwords from a Mandos server" };

914

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

915

if (ret == ARGP_ERR_UNKNOWN){

922

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

923

if(ret == ARGP_ERR_UNKNOWN){

916

924

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

917

925

exitcode = EXIT_FAILURE;

918

926

goto end;

943

951

goto end;

944

952

}

945

953

}

946

ret = TEMP_FAILURE_RETRY(close(sd));

954

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

947

955

if(ret == -1){

948

956

perror("close");

949

957

}

953

961

gid = getgid();

954

962

955

963

ret = setuid(uid);

956

if (ret == -1){

964

if(ret == -1){

957

965

perror("setuid");

958

966

}

959

967

960

968

setgid(gid);

961

if (ret == -1){

969

if(ret == -1){

962

970

perror("setgid");

963

971

}

964

972

965

973

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

966

if (ret == -1){

974

if(ret == -1){

967

975

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

968

976

exitcode = EXIT_FAILURE;

969

977

goto end;

970

978

} else {

971

gnutls_initalized = true;

979

gnutls_initialized = true;

972

980

}

973

981

974

982

if(mkdtemp(tempdir) == NULL){

978

986

}

979

987

980

988

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

981

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

989

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

982

990

exitcode = EXIT_FAILURE;

983

991

goto end;

984

992

} else {

985

gpgme_initalized = true;

993

gpgme_initialized = true;

986

994

}

987

995

988

996

if_index = (AvahiIfIndex) if_nametoindex(interface);

1000

1008

exitcode = EXIT_FAILURE;

1001

1009

goto end;

1002

1010

}

1003

errno = 0;

1004

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

1005

if(errno){

1006

perror("Bad port number");

1011

uint16_t port;

1012

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

1013

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

1014

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

1015

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

1007

1016

exitcode = EXIT_FAILURE;

1008

1017

goto end;

1009

1018

}

1019

port = (uint16_t)tmpmax;

1010

1020

*address = '\0';

1011

1021

address = connect_to;

1012

1022

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

1018

1028

goto end;

1019

1029

}

1020

1030

1021

if (not debug){

1031

if(not debug){

1022

1032

avahi_set_log_function(empty_log);

1023

1033

}

1024

1034

1027

1037

1028

1038

/* Allocate main Avahi loop object */

1029

1039

mc.simple_poll = avahi_simple_poll_new();

1030

if (mc.simple_poll == NULL) {

1040

if(mc.simple_poll == NULL) {

1031

1041

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

1032

1042

" object.\n");

1033

1043

exitcode = EXIT_FAILURE;

1053

1063

}

1054

1064

1055

1065

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

1056

if (mc.server == NULL) {

1066

if(mc.server == NULL) {

1057

1067

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

1058

1068

avahi_strerror(error));

1059

1069

exitcode = EXIT_FAILURE;

1065

1075

AVAHI_PROTO_INET6,

1066

1076

"_mandos._tcp", NULL, 0,

1067

1077

browse_callback, &mc);

1068

if (sb == NULL) {

1078

if(sb == NULL) {

1069

1079

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

1070

1080

avahi_strerror(avahi_server_errno(mc.server)));

1071

1081

exitcode = EXIT_FAILURE;

1074

1084

1075

1085

/* Run the main loop */

1076

1086

1077

if (debug){

1087

if(debug){

1078

1088

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

1079

1089

}

1080

1090

1082

1092

1083

1093

end:

1084

1094

1085

if (debug){

1095

if(debug){

1086

1096

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

1087

1097

}

1088

1098

1089

1099

/* Cleanup things */

1090

if (sb != NULL)

1100

if(sb != NULL)

1091

1101

avahi_s_service_browser_free(sb);

1092

1102

1093

if (mc.server != NULL)

1103

if(mc.server != NULL)

1094

1104

avahi_server_free(mc.server);

1095

1105

1096

if (mc.simple_poll != NULL)

1106

if(mc.simple_poll != NULL)

1097

1107

avahi_simple_poll_free(mc.simple_poll);

1098

1108

1099

if (gnutls_initalized){

1109

if(gnutls_initialized){

1100

1110

gnutls_certificate_free_credentials(mc.cred);

1101

gnutls_global_deinit ();

1111

gnutls_global_deinit();

1102

1112

gnutls_dh_params_deinit(mc.dh_params);

1103

1113

}

1104

1114

1105

if(gpgme_initalized){

1115

if(gpgme_initialized){

1106

1116

gpgme_release(mc.ctx);

1107

1117

}

1108

1118

1112

1122

struct dirent *direntry;

1113

1123

d = opendir(tempdir);

1114

1124

if(d == NULL){

1115

perror("opendir");

1125

if(errno != ENOENT){

1126

perror("opendir");

1127

}

1116

1128

} else {

1117

1129

while(true){

1118

1130

direntry = readdir(d);

1119

1131

if(direntry == NULL){

1120

1132

break;

1121

1133

}

1122

if (direntry->d_type == DT_REG){

1123

char *fullname = NULL;

1124

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

1125

direntry->d_name);

1126

if(ret < 0){

1127

perror("asprintf");

1128

continue;

1129

}

1130

ret = unlink(fullname);

1131

if(ret == -1){

1132

fprintf(stderr, "unlink(\"%s\"): %s",

1133

fullname, strerror(errno));

1134

}

1135

free(fullname);

1136

}

1134

/* Skip "." and ".." */

1135

if(direntry->d_name[0] == '.'

1136

and (direntry->d_name[1] == '\0'

1137

or (direntry->d_name[1] == '.'

1138

and direntry->d_name[2] == '\0'))){

1139

continue;

1140

}

1141

char *fullname = NULL;

1142

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

1143

direntry->d_name);

1144

if(ret < 0){

1145

perror("asprintf");

1146

continue;

1147

}

1148

ret = remove(fullname);

1149

if(ret == -1){

1150

fprintf(stderr, "remove(\"%s\"): %s\n", fullname,

1151

strerror(errno));

1152

}

1153

free(fullname);

1137

1154

}

1138

1155

closedir(d);

1139

1156

}

1140

1157

ret = rmdir(tempdir);

1141

if(ret == -1){

1158

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

1142

1159

perror("rmdir");

1143

1160

}

1144

1161

}

1145

1162

1146

1163

return exitcode;

1147

1164

}