/mandos/trunk : revision 237.2.11

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()

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*/

60

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

58

61

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

59

62

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

60

63

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

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,

89

92

gnutls_*

90

93

init_gnutls_session(),

91

94

GNUTLS_* */

92

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

95

#include <gnutls/openpgp.h>

96

/* gnutls_certificate_set_openpgp_key_file(),

93

97

GNUTLS_OPENPGP_FMT_BASE64 */

94

98

95

99

/* GPGME */

101

105

102

106

#define BUFFER_SIZE 256

103

107

104

/*

105

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

106

*/

107

108

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

109

#define SECKEY "seckey.txt"

110

#define PUBKEY "pubkey.txt"

111

112

bool debug = false;

113

static const char mandos_protocol_version[] = "1";

114

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

114

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

115

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

116

117

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

132

*/

133

size_t adjustbuffer(char **buffer, size_t buffer_length,

134

size_t buffer_capacity){

135

if (buffer_length + BUFFER_SIZE > buffer_capacity){

135

if(buffer_length + BUFFER_SIZE > buffer_capacity){

136

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

137

if (buffer == NULL){

137

if(buffer == NULL){

138

return 0;

139

}

140

buffer_capacity += BUFFER_SIZE;

159

int fd;

160

gpgme_data_t pgp_data;

161

162

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

162

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

163

if(fd == -1){

164

perror("open");

165

return false;

166

}

167

168

rc = gpgme_data_new_from_fd(&pgp_data, fd);

169

if (rc != GPG_ERR_NO_ERROR){

169

if(rc != GPG_ERR_NO_ERROR){

170

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

171

gpgme_strsource(rc), gpgme_strerror(rc));

172

return false;

173

}

174

175

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

176

if (rc != GPG_ERR_NO_ERROR){

176

if(rc != GPG_ERR_NO_ERROR){

177

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

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gpgme_strsource(rc), gpgme_strerror(rc));

179

return false;

180

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

182

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

183

if(ret == -1){

184

perror("close");

185

}

187

return true;

188

}

189

190

if (debug){

190

if(debug){

191

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

192

}

193

194

/* Init GPGME */

195

gpgme_check_version(NULL);

196

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

197

if (rc != GPG_ERR_NO_ERROR){

197

if(rc != GPG_ERR_NO_ERROR){

198

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

199

gpgme_strsource(rc), gpgme_strerror(rc));

200

return false;

201

}

202

203

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

204

rc = gpgme_get_engine_info (&engine_info);

205

if (rc != GPG_ERR_NO_ERROR){

204

rc = gpgme_get_engine_info(&engine_info);

205

if(rc != GPG_ERR_NO_ERROR){

206

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

207

gpgme_strsource(rc), gpgme_strerror(rc));

208

return false;

222

223

/* Create new GPGME "context" */

224

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

225

if (rc != GPG_ERR_NO_ERROR){

225

if(rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

228

return false;

229

}

230

231

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

231

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

232

return false;

233

}

234

239

* Decrypt OpenPGP data.

240

* Returns -1 on error

241

*/

242

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

242

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

246

gpgme_data_t dh_crypto, dh_plain;

247

gpgme_error_t rc;

248

ssize_t ret;

249

size_t plaintext_capacity = 0;

250

ssize_t plaintext_length = 0;

251

252

if (debug){

252

if(debug){

253

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

254

}

255

256

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

257

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

258

0);

259

if (rc != GPG_ERR_NO_ERROR){

259

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

262

return -1;

264

265

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

266

rc = gpgme_data_new(&dh_plain);

267

if (rc != GPG_ERR_NO_ERROR){

267

if(rc != GPG_ERR_NO_ERROR){

268

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

269

gpgme_strsource(rc), gpgme_strerror(rc));

270

gpgme_data_release(dh_crypto);

274

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

275

data buffer */

276

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

277

if (rc != GPG_ERR_NO_ERROR){

277

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

280

plaintext_length = -1;

281

if (debug){

281

if(debug){

282

gpgme_decrypt_result_t result;

283

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

284

if(result == NULL){

285

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

286

} else {

287

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

314

}

315

316

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

317

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

317

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

318

perror("gpgme_data_seek");

319

plaintext_length = -1;

320

goto decrypt_end;

325

plaintext_capacity = adjustbuffer(plaintext,

326

(size_t)plaintext_length,

327

plaintext_capacity);

328

if (plaintext_capacity == 0){

328

if(plaintext_capacity == 0){

329

perror("adjustbuffer");

330

plaintext_length = -1;

331

goto decrypt_end;

334

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

335

BUFFER_SIZE);

336

/* Print the data, if any */

337

if (ret == 0){

337

if(ret == 0){

338

/* EOF */

339

break;

340

}

364

return plaintext_length;

365

}

366

367

static const char * safer_gnutls_strerror (int value) {

368

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

369

if (ret == NULL)

367

static const char * safer_gnutls_strerror(int value) {

368

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

369

-Wunreachable-code */

370

if(ret == NULL)

370

371

ret = "(unknown)";

371

372

return ret;

372

373

}

387

388

}

388

389

390

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

391

if(ret != GNUTLS_E_SUCCESS) {

392

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

393

safer_gnutls_strerror(ret));

393

394

return -1;

394

395

}

395

396

if (debug){

397

if(debug){

397

398

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

398

399

* - GnuTLS manual

399

400

*/

403

404

405

/* OpenPGP credentials */

405

406

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 ();

407

if(ret != GNUTLS_E_SUCCESS){

408

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

409

* from

410

* -Wunreachable-code

411

*/

412

safer_gnutls_strerror(ret));

413

gnutls_global_deinit();

411

414

return -1;

412

415

}

413

416

420

423

ret = gnutls_certificate_set_openpgp_key_file

421

424

(mc->cred, pubkeyfilename, seckeyfilename,

422

425

GNUTLS_OPENPGP_FMT_BASE64);

423

if (ret != GNUTLS_E_SUCCESS) {

426

if(ret != GNUTLS_E_SUCCESS) {

424

427

fprintf(stderr,

425

428

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

426

429

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

431

434

432

435

/* GnuTLS server initialization */

433

436

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));

437

if(ret != GNUTLS_E_SUCCESS) {

438

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

439

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

437

440

goto globalfail;

438

441

}

439

442

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));

443

if(ret != GNUTLS_E_SUCCESS) {

444

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

445

safer_gnutls_strerror(ret));

443

446

goto globalfail;

444

447

}

445

448

460

463

int ret;

461

464

/* GnuTLS session creation */

462

465

ret = gnutls_init(session, GNUTLS_SERVER);

463

if (ret != GNUTLS_E_SUCCESS){

466

if(ret != GNUTLS_E_SUCCESS){

464

467

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

465

468

safer_gnutls_strerror(ret));

466

469

}

468

471

{

469

472

const char *err;

470

473

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

471

if (ret != GNUTLS_E_SUCCESS) {

474

if(ret != GNUTLS_E_SUCCESS) {

472

475

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

473

476

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

474

477

safer_gnutls_strerror(ret));

475

gnutls_deinit (*session);

478

gnutls_deinit(*session);

476

479

return -1;

477

480

}

478

481

}

479

482

480

483

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

481

484

mc->cred);

482

if (ret != GNUTLS_E_SUCCESS) {

485

if(ret != GNUTLS_E_SUCCESS) {

483

486

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

484

487

safer_gnutls_strerror(ret));

485

gnutls_deinit (*session);

488

gnutls_deinit(*session);

486

489

return -1;

487

490

}

488

491

489

492

/* ignore client certificate if any. */

490

gnutls_certificate_server_set_request (*session,

491

GNUTLS_CERT_IGNORE);

493

gnutls_certificate_server_set_request(*session,

494

GNUTLS_CERT_IGNORE);

492

495

493

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

496

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

494

497

495

498

return 0;

496

499

}

504

507

AvahiIfIndex if_index,

505

508

mandos_context *mc){

506

509

int ret, tcp_sd;

510

ssize_t sret;

507

511

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

508

512

char *buffer = NULL;

509

513

char *decrypted_buffer;

515

519

char interface[IF_NAMESIZE];

516

520

gnutls_session_t session;

517

521

518

ret = init_gnutls_session (mc, &session);

519

if (ret != 0){

522

ret = init_gnutls_session(mc, &session);

523

if(ret != 0){

520

524

return -1;

521

525

}

522

526

544

548

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

545

549

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

546

550

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

547

if (ret < 0 ){

551

if(ret < 0 ){

548

552

perror("inet_pton");

549

553

return -1;

550

554

}

552

556

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

553

557

return -1;

554

558

}

555

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

559

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

560

-Wconversion and

561

-Wunreachable-code */

556

562

557

563

to.in6.sin6_scope_id = (uint32_t)if_index;

558

564

571

577

}

572

578

573

579

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

574

if (ret < 0){

580

if(ret < 0){

575

581

perror("connect");

576

582

return -1;

577

583

}

578

584

579

585

const char *out = mandos_protocol_version;

580

586

written = 0;

581

while (true){

587

while(true){

582

588

size_t out_size = strlen(out);

583

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

589

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

584

590

out_size - written));

585

if (ret == -1){

591

if(ret == -1){

586

592

perror("write");

587

593

retval = -1;

588

594

goto mandos_end;

591

597

if(written < out_size){

592

598

continue;

593

599

} else {

594

if (out == mandos_protocol_version){

600

if(out == mandos_protocol_version){

595

601

written = 0;

596

602

out = "\r\n";

597

603

} else {

604

610

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

605

611

}

606

612

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

613

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

608

614

609

615

do{

610

ret = gnutls_handshake (session);

616

ret = gnutls_handshake(session);

611

617

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

612

618

613

if (ret != GNUTLS_E_SUCCESS){

619

if(ret != GNUTLS_E_SUCCESS){

614

620

if(debug){

615

621

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

616

gnutls_perror (ret);

622

gnutls_perror(ret);

617

623

}

618

624

retval = -1;

619

625

goto mandos_end;

629

635

while(true){

630

636

buffer_capacity = adjustbuffer(&buffer, buffer_length,

631

637

buffer_capacity);

632

if (buffer_capacity == 0){

638

if(buffer_capacity == 0){

633

639

perror("adjustbuffer");

634

640

retval = -1;

635

641

goto mandos_end;

636

642

}

637

643

638

ret = gnutls_record_recv(session, buffer+buffer_length,

639

BUFFER_SIZE);

640

if (ret == 0){

644

sret = gnutls_record_recv(session, buffer+buffer_length,

645

BUFFER_SIZE);

646

if(sret == 0){

641

647

break;

642

648

}

643

if (ret < 0){

644

switch(ret){

649

if(sret < 0){

650

switch(sret){

645

651

case GNUTLS_E_INTERRUPTED:

646

652

case GNUTLS_E_AGAIN:

647

653

break;

648

654

case GNUTLS_E_REHANDSHAKE:

649

655

do{

650

ret = gnutls_handshake (session);

656

ret = gnutls_handshake(session);

651

657

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

652

if (ret < 0){

658

if(ret < 0){

653

659

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

654

gnutls_perror (ret);

660

gnutls_perror(ret);

655

661

retval = -1;

656

662

goto mandos_end;

657

663

}

660

666

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

661

667

" encrypted session with Mandos server\n");

662

668

retval = -1;

663

gnutls_bye (session, GNUTLS_SHUT_RDWR);

669

gnutls_bye(session, GNUTLS_SHUT_RDWR);

664

670

goto mandos_end;

665

671

}

666

672

} else {

667

buffer_length += (size_t) ret;

673

buffer_length += (size_t) sret;

668

674

}

669

675

}

670

676

672

678

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

673

679

}

674

680

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

681

gnutls_bye(session, GNUTLS_SHUT_RDWR);

676

682

677

if (buffer_length > 0){

683

if(buffer_length > 0){

678

684

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

679

685

buffer_length,

680

686

&decrypted_buffer);

681

if (decrypted_buffer_size >= 0){

687

if(decrypted_buffer_size >= 0){

682

688

written = 0;

683

689

while(written < (size_t) decrypted_buffer_size){

684

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

685

(size_t)decrypted_buffer_size - written,

686

stdout);

690

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

691

(size_t)decrypted_buffer_size - written,

692

stdout);

687

693

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

688

694

if(debug){

689

695

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

706

712

707

713

mandos_end:

708

714

free(buffer);

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

715

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

710

716

if(ret == -1){

711

717

perror("close");

712

718

}

713

gnutls_deinit (session);

719

gnutls_deinit(session);

714

720

return retval;

715

721

}

716

722

734

740

/* Called whenever a service has been resolved successfully or

735

741

timed out */

736

742

737

switch (event) {

743

switch(event) {

738

744

default:

739

745

case AVAHI_RESOLVER_FAILURE:

740

746

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

748

754

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

749

755

if(debug){

750

756

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

751

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

752

interface, port);

757

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

758

ip, (intmax_t)interface, port);

753

759

}

754

760

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

755

if (ret == 0){

761

if(ret == 0){

756

762

avahi_simple_poll_quit(mc->simple_poll);

757

763

}

758

764

}

776

782

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

777

783

is removed from the LAN */

778

784

779

switch (event) {

785

switch(event) {

780

786

default:

781

787

case AVAHI_BROWSER_FAILURE:

782

788

791

797

the callback function is called the Avahi server will free the

792

798

resolver for us. */

793

799

794

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

800

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

795

801

protocol, name, type, domain,

796

802

AVAHI_PROTO_INET6, 0,

797

803

resolve_callback, mc)))

815

821

AvahiSServiceBrowser *sb = NULL;

816

822

int error;

817

823

int ret;

824

intmax_t tmpmax;

825

int numchars;

818

826

int exitcode = EXIT_SUCCESS;

819

827

const char *interface = "eth0";

820

828

struct ifreq network;

866

874

{ .name = NULL }

867

875

};

868

876

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) {

877

error_t parse_opt(int key, char *arg,

878

struct argp_state *state) {

879

switch(key) {

874

880

case 128: /* --debug */

875

881

debug = true;

876

882

break;

887

893

pubkey = arg;

888

894

break;

889

895

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

890

errno = 0;

891

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

892

if (errno){

893

perror("strtol");

896

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

897

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

898

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

899

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

894

900

exit(EXIT_FAILURE);

895

901

}

902

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

896

903

break;

897

904

case 130: /* --priority */

898

905

mc.priority = arg;

899

906

break;

900

907

case ARGP_KEY_ARG:

901

argp_usage (state);

908

argp_usage(state);

902

909

case ARGP_KEY_END:

903

910

break;

904

911

default:

911

918

.args_doc = "",

912

919

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

913

920

" passwords from a Mandos server" };

914

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

915

if (ret == ARGP_ERR_UNKNOWN){

921

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

922

if(ret == ARGP_ERR_UNKNOWN){

916

923

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

917

924

exitcode = EXIT_FAILURE;

918

925

goto end;

943

950

goto end;

944

951

}

945

952

}

946

ret = TEMP_FAILURE_RETRY(close(sd));

953

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

947

954

if(ret == -1){

948

955

perror("close");

949

956

}

953

960

gid = getgid();

954

961

955

962

ret = setuid(uid);

956

if (ret == -1){

963

if(ret == -1){

957

964

perror("setuid");

958

965

}

959

966

960

967

setgid(gid);

961

if (ret == -1){

968

if(ret == -1){

962

969

perror("setgid");

963

970

}

964

971

965

972

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

966

if (ret == -1){

973

if(ret == -1){

967

974

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

968

975

exitcode = EXIT_FAILURE;

969

976

goto end;

1000

1007

exitcode = EXIT_FAILURE;

1001

1008

goto end;

1002

1009

}

1003

errno = 0;

1004

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

1005

if(errno){

1006

perror("Bad port number");

1010

uint16_t port;

1011

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

1012

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

1013

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

1014

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

1007

1015

exitcode = EXIT_FAILURE;

1008

1016

goto end;

1009

1017

}

1018

port = (uint16_t)tmpmax;

1010

1019

*address = '\0';

1011

1020

address = connect_to;

1012

1021

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

1018

1027

goto end;

1019

1028

}

1020

1029

1021

if (not debug){

1030

if(not debug){

1022

1031

avahi_set_log_function(empty_log);

1023

1032

}

1024

1033

1027

1036

1028

1037

/* Allocate main Avahi loop object */

1029

1038

mc.simple_poll = avahi_simple_poll_new();

1030

if (mc.simple_poll == NULL) {

1039

if(mc.simple_poll == NULL) {

1031

1040

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

1032

1041

" object.\n");

1033

1042

exitcode = EXIT_FAILURE;

1053

1062

}

1054

1063

1055

1064

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

1056

if (mc.server == NULL) {

1065

if(mc.server == NULL) {

1057

1066

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

1058

1067

avahi_strerror(error));

1059

1068

exitcode = EXIT_FAILURE;

1065

1074

AVAHI_PROTO_INET6,

1066

1075

"_mandos._tcp", NULL, 0,

1067

1076

browse_callback, &mc);

1068

if (sb == NULL) {

1077

if(sb == NULL) {

1069

1078

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

1070

1079

avahi_strerror(avahi_server_errno(mc.server)));

1071

1080

exitcode = EXIT_FAILURE;

1074

1083

1075

1084

/* Run the main loop */

1076

1085

1077

if (debug){

1086

if(debug){

1078

1087

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

1079

1088

}

1080

1089

1082

1091

1083

1092

end:

1084

1093

1085

if (debug){

1094

if(debug){

1086

1095

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

1087

1096

}

1088

1097

1089

1098

/* Cleanup things */

1090

if (sb != NULL)

1099

if(sb != NULL)

1091

1100

avahi_s_service_browser_free(sb);

1092

1101

1093

if (mc.server != NULL)

1102

if(mc.server != NULL)

1094

1103

avahi_server_free(mc.server);

1095

1104

1096

if (mc.simple_poll != NULL)

1105

if(mc.simple_poll != NULL)

1097

1106

avahi_simple_poll_free(mc.simple_poll);

1098

1107

1099

if (gnutls_initalized){

1108

if(gnutls_initalized){

1100

1109

gnutls_certificate_free_credentials(mc.cred);

1101

gnutls_global_deinit ();

1110

gnutls_global_deinit();

1102

1111

gnutls_dh_params_deinit(mc.dh_params);

1103

1112

}

1104

1113

1112

1121

struct dirent *direntry;

1113

1122

d = opendir(tempdir);

1114

1123

if(d == NULL){

1115

perror("opendir");

1124

if(errno != ENOENT){

1125

perror("opendir");

1126

}

1116

1127

} else {

1117

1128

while(true){

1118

1129

direntry = readdir(d);

1119

1130

if(direntry == NULL){

1120

1131

break;

1121

1132

}

1122

if (direntry->d_type == DT_REG){

1133

if(direntry->d_type == DT_REG){

1123

1134

char *fullname = NULL;

1124

1135

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

1125

1136

direntry->d_name);

1138

1149

closedir(d);

1139

1150

}

1140

1151

ret = rmdir(tempdir);

1141

if(ret == -1){

1152

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

1142

1153

perror("rmdir");

1143

1154

}

1144

1155

}