/mandos/trunk : revision 174

32

#define _LARGEFILE_SOURCE

33

#define _FILE_OFFSET_BITS 64

34

35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

35

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

36

37

#include <stdio.h>

38

#include <assert.h>

39

#include <stdlib.h>

40

#include <time.h>

41

#include <net/if.h> /* if_nametoindex */

42

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

43

SIOCSIFFLAGS */

37

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

38

stdout, ferror() */

39

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

40

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

41

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

42

srand() */

43

#include <stdbool.h> /* bool, true */

44

#include <string.h> /* memset(), strcmp(), strlen(),

45

strerror(), asprintf(), strcpy() */

46

#include <sys/ioctl.h> /* ioctl */

47

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

48

sockaddr_in6, PF_INET6,

49

SOCK_STREAM, INET6_ADDRSTRLEN,

50

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

51

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

52

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

53

struct in6_addr, inet_pton(),

54

connect() */

55

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

56

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

57

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

58

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

59

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

60

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

44

61

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

45

SIOCSIFFLAGS */

62

SIOCSIFFLAGS, if_indextoname(),

63

if_nametoindex(), IF_NAMESIZE */

64

#include <netinet/in.h>

65

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

66

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

67

setgid() */

68

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

69

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

70

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

71

argp_state, struct argp,

72

argp_parse(), ARGP_KEY_ARG,

73

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

46

74

75

/* Avahi */

76

/* All Avahi types, constants and functions

77

Avahi*, avahi_*,

78

AVAHI_* */

47

79

#include <avahi-core/core.h>

48

80

#include <avahi-core/lookup.h>

49

81

#include <avahi-core/log.h>

51

83

#include <avahi-common/malloc.h>

52

84

#include <avahi-common/error.h>

53

85

54

/* Mandos client part */

55

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

56

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

57

struct in6_addr, inet_pton() */

58

#include <gnutls/gnutls.h> /* All GnuTLS stuff */

59

#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */

86

/* GnuTLS */

87

#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

88

functions:

89

gnutls_*

90

init_gnutls_session(),

91

GNUTLS_* */

92

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

93

GNUTLS_OPENPGP_FMT_BASE64 */

60

94

61

#include <unistd.h> /* close() */

62

#include <netinet/in.h>

63

#include <stdbool.h> /* true */

64

#include <string.h> /* memset */

65

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

66

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

67

#include <net/if.h> /* IF_NAMESIZE */

68

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

69

struct argp_state, struct argp,

70

argp_parse() */

71

95

/* GPGME */

72

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

73

#include <gpgme.h>

96

#include <gpgme.h> /* All GPGME types, constants and

97

functions:

98

gpgme_*

99

GPGME_PROTOCOL_OpenPGP,

100

GPG_ERR_NO_* */

74

101

75

102

#define BUFFER_SIZE 256

76

103

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

77

112

bool debug = false;

78

static const char *keydir = "/conf/conf.d/mandos";

79

113

static const char mandos_protocol_version[] = "1";

80

const char *argp_program_version = "mandosclient 0.9";

114

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

81

115

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

82

116

83

117

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

88

122

unsigned int dh_bits;

89

123

gnutls_dh_params_t dh_params;

90

124

const char *priority;

125

gpgme_ctx_t ctx;

91

126

} mandos_context;

92

127

93

128

/*

108

143

}

109

144

110

145

/*

111

* Decrypt OpenPGP data using keyrings in HOMEDIR.

112

* Returns -1 on error

146

* Initialize GPGME.

113

147

*/

114

static ssize_t pgp_packet_decrypt (const char *cryptotext,

115

size_t crypto_size,

116

char **plaintext,

117

const char *homedir){

118

gpgme_data_t dh_crypto, dh_plain;

119

gpgme_ctx_t ctx;

148

static bool init_gpgme(mandos_context *mc, const char *seckey,

149

const char *pubkey, const char *tempdir){

150

int ret;

120

151

gpgme_error_t rc;

121

ssize_t ret;

122

size_t plaintext_capacity = 0;

123

ssize_t plaintext_length = 0;

124

152

gpgme_engine_info_t engine_info;

125

153

154

155

/*

156

* Helper function to insert pub and seckey to the enigne keyring.

157

*/

158

bool import_key(const char *filename){

159

int fd;

160

gpgme_data_t pgp_data;

161

162

fd = 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){

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){

177

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

178

gpgme_strsource(rc), gpgme_strerror(rc));

179

return false;

180

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

183

if(ret == -1){

184

perror("close");

185

}

186

gpgme_data_release(pgp_data);

187

return true;

188

}

189

126

190

if (debug){

127

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

191

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

128

192

}

129

193

130

194

/* Init GPGME */

133

197

if (rc != GPG_ERR_NO_ERROR){

134

198

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

135

199

gpgme_strsource(rc), gpgme_strerror(rc));

136

return -1;

200

return false;

137

201

}

138

202

139

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

203

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

140

204

rc = gpgme_get_engine_info (&engine_info);

141

205

if (rc != GPG_ERR_NO_ERROR){

142

206

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

143

207

gpgme_strsource(rc), gpgme_strerror(rc));

144

return -1;

208

return false;

145

209

}

146

210

while(engine_info != NULL){

147

211

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

148

212

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

149

engine_info->file_name, homedir);

213

engine_info->file_name, tempdir);

150

214

break;

151

215

}

152

216

engine_info = engine_info->next;

153

217

}

154

218

if(engine_info == NULL){

155

fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);

156

return -1;

219

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

220

return false;

221

}

222

223

/* Create new GPGME "context" */

224

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

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)){

232

return false;

233

}

234

235

return true;

236

}

237

238

/*

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){

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){

253

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

157

254

}

158

255

159

256

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

174

271

return -1;

175

272

}

176

273

177

/* Create new GPGME "context" */

178

rc = gpgme_new(&ctx);

179

if (rc != GPG_ERR_NO_ERROR){

180

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

181

gpgme_strsource(rc), gpgme_strerror(rc));

182

plaintext_length = -1;

183

goto decrypt_end;

184

}

185

186

274

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

187

275

data buffer */

188

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

276

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

189

277

if (rc != GPG_ERR_NO_ERROR){

190

278

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

191

279

gpgme_strsource(rc), gpgme_strerror(rc));

192

280

plaintext_length = -1;

281

if (debug){

282

gpgme_decrypt_result_t result;

283

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

285

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

286

} else {

287

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

288

result->unsupported_algorithm);

289

fprintf(stderr, "Wrong key usage: %u\n",

290

result->wrong_key_usage);

291

if(result->file_name != NULL){

292

fprintf(stderr, "File name: %s\n", result->file_name);

293

}

294

gpgme_recipient_t recipient;

295

recipient = result->recipients;

296

if(recipient){

297

while(recipient != NULL){

298

fprintf(stderr, "Public key algorithm: %s\n",

299

gpgme_pubkey_algo_name(recipient->pubkey_algo));

300

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

301

fprintf(stderr, "Secret key available: %s\n",

302

recipient->status == GPG_ERR_NO_SECKEY

303

? "No" : "Yes");

304

recipient = recipient->next;

305

}

306

}

307

}

308

}

193

309

goto decrypt_end;

194

310

}

195

311

197

313

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

198

314

}

199

315

200

if (debug){

201

gpgme_decrypt_result_t result;

202

result = gpgme_op_decrypt_result(ctx);

203

if (result == NULL){

204

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

205

} else {

206

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

207

result->unsupported_algorithm);

208

fprintf(stderr, "Wrong key usage: %d\n",

209

result->wrong_key_usage);

210

if(result->file_name != NULL){

211

fprintf(stderr, "File name: %s\n", result->file_name);

212

}

213

gpgme_recipient_t recipient;

214

recipient = result->recipients;

215

if(recipient){

216

while(recipient != NULL){

217

fprintf(stderr, "Public key algorithm: %s\n",

218

gpgme_pubkey_algo_name(recipient->pubkey_algo));

219

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

220

fprintf(stderr, "Secret key available: %s\n",

221

recipient->status == GPG_ERR_NO_SECKEY

222

? "No" : "Yes");

223

recipient = recipient->next;

224

}

225

}

226

}

227

}

228

229

316

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

230

317

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

231

318

perror("pgpme_data_seek");

258

345

}

259

346

plaintext_length += ret;

260

347

}

261

348

262

349

if(debug){

263

350

fprintf(stderr, "Decrypted password is: ");

264

351

for(ssize_t i = 0; i < plaintext_length; i++){

278

365

}

279

366

280

367

static const char * safer_gnutls_strerror (int value) {

281

const char *ret = gnutls_strerror (value);

368

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

282

369

if (ret == NULL)

283

370

ret = "(unknown)";

284

371

return ret;

291

378

}

292

379

293

380

static int init_gnutls_global(mandos_context *mc,

294

const char *pubkeyfile,

295

const char *seckeyfile){

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

296

383

int ret;

297

384

298

385

if(debug){

299

386

fprintf(stderr, "Initializing GnuTLS\n");

300

387

}

301

302

if ((ret = gnutls_global_init ())

303

!= GNUTLS_E_SUCCESS) {

388

389

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

304

391

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

305

392

safer_gnutls_strerror(ret));

306

393

return -1;

315

402

}

316

403

317

404

/* OpenPGP credentials */

318

if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

319

!= GNUTLS_E_SUCCESS) {

320

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

405

gnutls_certificate_allocate_credentials(&mc->cred);

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

321

409

safer_gnutls_strerror(ret));

322

410

gnutls_global_deinit ();

323

411

return -1;

324

412

}

325

413

326

414

if(debug){

327

fprintf(stderr, "Attempting to use OpenPGP certificate %s"

328

" and keyfile %s as GnuTLS credentials\n", pubkeyfile,

329

seckeyfile);

415

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

416

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

417

seckeyfilename);

330

418

}

331

419

332

420

ret = gnutls_certificate_set_openpgp_key_file

333

(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

334

423

if (ret != GNUTLS_E_SUCCESS) {

335

424

fprintf(stderr,

336

425

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

337

" '%s')\n", ret, pubkeyfile, seckeyfile);

338

fprintf(stdout, "The GnuTLS error is: %s\n",

426

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

427

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

339

428

safer_gnutls_strerror(ret));

340

429

goto globalfail;

341

430

}

355

444

}

356

445

357

446

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

358

447

359

448

return 0;

360

449

361

450

globalfail:

362

363

gnutls_certificate_free_credentials (mc->cred);

364

gnutls_global_deinit ();

451

452

gnutls_certificate_free_credentials(mc->cred);

453

gnutls_global_deinit();

365

454

return -1;

366

367

455

}

368

456

369

457

static int init_gnutls_session(mandos_context *mc,

432

520

}

433

521

434

522

if(debug){

435

fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

436

ip, port);

523

fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16

524

"\n", ip, port);

437

525

}

438

526

439

527

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

441

529

perror("socket");

442

530

return -1;

443

531

}

444

532

445

533

if(debug){

446

534

if(if_indextoname((unsigned int)if_index, interface) == NULL){

447

535

perror("if_indextoname");

450

538

fprintf(stderr, "Binding to interface %s\n", interface);

451

539

}

452

540

453

memset(&to,0,sizeof(to)); /* Spurious warning */

541

memset(&to, 0, sizeof(to));

454

542

to.in6.sin6_family = AF_INET6;

455

543

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

456

544

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

463

551

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

464

552

return -1;

465

553

}

466

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

554

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

467

555

468

556

to.in6.sin6_scope_id = (uint32_t)if_index;

469

557

470

558

if(debug){

471

fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

559

fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

560

port);

472

561

char addrstr[INET6_ADDRSTRLEN] = "";

473

562

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

474

563

sizeof(addrstr)) == NULL){

485

574

perror("connect");

486

575

return -1;

487

576

}

488

577

489

578

const char *out = mandos_protocol_version;

490

579

written = 0;

491

580

while (true){

509

598

}

510

599

}

511

600

}

512

601

513

602

if(debug){

514

603

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

515

604

}

516

605

517

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

518

607

519

ret = gnutls_handshake (session);

608

do{

609

ret = gnutls_handshake (session);

610

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

520

611

521

612

if (ret != GNUTLS_E_SUCCESS){

522

613

if(debug){

533

624

fprintf(stderr, "Retrieving pgp encrypted password from %s\n",

534

625

ip);

535

626

}

536

627

537

628

while(true){

538

629

buffer_capacity = adjustbuffer(&buffer, buffer_length,

539

630

buffer_capacity);

554

645

case GNUTLS_E_AGAIN:

555

646

break;

556

647

case GNUTLS_E_REHANDSHAKE:

557

ret = gnutls_handshake (session);

648

do{

649

ret = gnutls_handshake (session);

650

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

558

651

if (ret < 0){

559

652

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

560

653

gnutls_perror (ret);

581

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

582

675

583

676

if (buffer_length > 0){

584

decrypted_buffer_size = pgp_packet_decrypt(buffer,

677

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

585

678

buffer_length,

586

&decrypted_buffer,

587

keydir);

679

&decrypted_buffer);

588

680

if (decrypted_buffer_size >= 0){

589

681

written = 0;

590

682

while(written < (size_t) decrypted_buffer_size){

605

697

} else {

606

698

retval = -1;

607

699

}

700

} else {

701

retval = -1;

608

702

}

609

703

610

704

/* Shutdown procedure */

611

705

612

706

mandos_end:

613

707

free(buffer);

614

close(tcp_sd);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

709

if(ret == -1){

710

perror("close");

711

}

615

712

gnutls_deinit (session);

616

713

return retval;

617

714

}

631

728

flags,

632

729

void* userdata) {

633

730

mandos_context *mc = userdata;

634

assert(r); /* Spurious warning */

731

assert(r);

635

732

636

733

/* Called whenever a service has been resolved successfully or

637

734

timed out */

649

746

char ip[AVAHI_ADDRESS_STR_MAX];

650

747

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

651

748

if(debug){

652

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

653

" port %d\n", name, host_name, ip, interface, port);

749

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

750

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

751

interface, port);

654

752

}

655

753

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

656

754

if (ret == 0){

657

exit(EXIT_SUCCESS);

755

avahi_simple_poll_quit(mc->simple_poll);

658

756

}

659

757

}

660

758

}

672

770

flags,

673

771

void* userdata) {

674

772

mandos_context *mc = userdata;

675

assert(b); /* Spurious warning */

773

assert(b);

676

774

677

775

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

678

776

is removed from the LAN */

712

810

}

713

811

}

714

812

715

/* Combines file name and path and returns the malloced new

716

string. some sane checks could/should be added */

717

static const char *combinepath(const char *first, const char *second){

718

size_t f_len = strlen(first);

719

size_t s_len = strlen(second);

720

char *tmp = malloc(f_len + s_len + 2);

721

if (tmp == NULL){

722

return NULL;

723

}

724

if(f_len > 0){

725

memcpy(tmp, first, f_len); /* Spurious warning */

726

}

727

tmp[f_len] = '/';

728

if(s_len > 0){

729

memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */

730

}

731

tmp[f_len + 1 + s_len] = '\0';

732

return tmp;

733

}

734

735

736

813

int main(int argc, char *argv[]){

737

814

AvahiSServiceBrowser *sb = NULL;

738

815

int error;

744

821

uid_t uid;

745

822

gid_t gid;

746

823

char *connect_to = NULL;

824

char tempdir[] = "/tmp/mandosXXXXXX";

747

825

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

748

const char *pubkeyfile = "pubkey.txt";

749

const char *seckeyfile = "seckey.txt";

826

const char *seckey = PATHDIR "/" SECKEY;

827

const char *pubkey = PATHDIR "/" PUBKEY;

828

750

829

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

751

.dh_bits = 1024, .priority = "SECURE256"};

830

.dh_bits = 1024, .priority = "SECURE256"

831

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

752

832

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

753

834

754

835

{

755

836

struct argp_option options[] = {

756

837

{ .name = "debug", .key = 128,

757

838

.doc = "Debug mode", .group = 3 },

758

839

{ .name = "connect", .key = 'c',

759

.arg = "IP",

760

.doc = "Connect directly to a sepcified mandos server",

840

.arg = "ADDRESS:PORT",

841

.doc = "Connect directly to a specific Mandos server",

761

842

.group = 1 },

762

843

{ .name = "interface", .key = 'i',

763

.arg = "INTERFACE",

764

.doc = "Interface that Avahi will conntect through",

765

.group = 1 },

766

{ .name = "keydir", .key = 'd',

767

.arg = "KEYDIR",

768

.doc = "Directory where the openpgp keyring is",

844

.arg = "NAME",

845

.doc = "Interface that will be used to search for Mandos"

846

" servers",

769

847

.group = 1 },

770

848

{ .name = "seckey", .key = 's',

771

.arg = "SECKEY",

772

.doc = "Secret openpgp key for gnutls authentication",

849

.arg = "FILE",

850

.doc = "OpenPGP secret key file base name",

773

851

.group = 1 },

774

852

{ .name = "pubkey", .key = 'p',

775

.arg = "PUBKEY",

776

.doc = "Public openpgp key for gnutls authentication",

853

.arg = "FILE",

854

.doc = "OpenPGP public key file base name",

777

855

.group = 2 },

778

856

{ .name = "dh-bits", .key = 129,

779

857

.arg = "BITS",

780

.doc = "dh-bits to use in gnutls communication",

858

.doc = "Bit length of the prime number used in the"

859

" Diffie-Hellman key exchange",

781

860

.group = 2 },

782

861

{ .name = "priority", .key = 130,

783

.arg = "PRIORITY",

784

.doc = "GNUTLS priority", .group = 1 },

862

.arg = "STRING",

863

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

864

.group = 1 },

785

865

{ .name = NULL }

786

866

};

787

788

867

789

868

error_t parse_opt (int key, char *arg,

790

869

struct argp_state *state) {

791

870

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

792

871

a pointer to our plugin list pointer. */

793

872

switch (key) {

794

case 128:

873

case 128: /* --debug */

795

874

debug = true;

796

875

break;

797

case 'c':

876

case 'c': /* --connect */

798

877

connect_to = arg;

799

878

break;

800

case 'i':

879

case 'i': /* --interface */

801

880

interface = arg;

802

881

break;

803

case 'd':

804

keydir = arg;

805

break;

806

case 's':

807

seckeyfile = arg;

808

break;

809

case 'p':

810

pubkeyfile = arg;

811

break;

812

case 129:

882

case 's': /* --seckey */

883

seckey = arg;

884

break;

885

case 'p': /* --pubkey */

886

pubkey = arg;

887

break;

888

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

813

889

errno = 0;

814

890

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

815

891

if (errno){

817

893

exit(EXIT_FAILURE);

818

894

}

819

895

break;

820

case 130:

896

case 130: /* --priority */

821

897

mc.priority = arg;

822

898

break;

823

899

case ARGP_KEY_ARG:

824

900

argp_usage (state);

901

case ARGP_KEY_END:

825

902

break;

826

case ARGP_KEY_END:

827

break;

828

903

default:

829

904

return ARGP_ERR_UNKNOWN;

830

905

}

831

906

return 0;

832

907

}

833

908

834

909

struct argp argp = { .options = options, .parser = parse_opt,

835

910

.args_doc = "",

836

911

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

837

" passwords from mandos server" };

838

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

839

}

840

841

pubkeyfile = combinepath(keydir, pubkeyfile);

842

if (pubkeyfile == NULL){

843

perror("combinepath");

844

exitcode = EXIT_FAILURE;

845

goto end;

846

}

847

848

seckeyfile = combinepath(keydir, seckeyfile);

849

if (seckeyfile == NULL){

850

perror("combinepath");

851

goto end;

852

}

853

854

ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);

855

if (ret == -1){

856

fprintf(stderr, "init_gnutls_global\n");

857

goto end;

858

} else {

859

gnutls_initalized = true;

860

}

861

912

" passwords from a Mandos server" };

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

915

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

916

exitcode = EXIT_FAILURE;

917

goto end;

918

}

919

}

920

921

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

922

{

923

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

924

if(sd < 0) {

925

perror("socket");

926

exitcode = EXIT_FAILURE;

927

goto end;

928

}

929

strcpy(network.ifr_name, interface);

930

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

931

if(ret == -1){

932

perror("ioctl SIOCGIFFLAGS");

933

exitcode = EXIT_FAILURE;

934

goto end;

935

}

936

if((network.ifr_flags & IFF_UP) == 0){

937

network.ifr_flags |= IFF_UP;

938

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

939

if(ret == -1){

940

perror("ioctl SIOCSIFFLAGS");

941

exitcode = EXIT_FAILURE;

942

goto end;

943

}

944

}

945

ret = TEMP_FAILURE_RETRY(close(sd));

946

if(ret == -1){

947

perror("close");

948

}

949

}

950

862

951

uid = getuid();

863

952

gid = getgid();

864

953

865

954

ret = setuid(uid);

866

955

if (ret == -1){

867

956

perror("setuid");

872

961

perror("setgid");

873

962

}

874

963

964

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

965

if (ret == -1){

966

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

967

exitcode = EXIT_FAILURE;

968

goto end;

969

} else {

970

gnutls_initalized = true;

971

}

972

973

if(mkdtemp(tempdir) == NULL){

974

perror("mkdtemp");

975

tempdir[0] = '\0';

976

goto end;

977

}

978

979

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

980

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

981

exitcode = EXIT_FAILURE;

982

goto end;

983

} else {

984

pgpme_initalized = true;

985

}

986

875

987

if_index = (AvahiIfIndex) if_nametoindex(interface);

876

988

if(if_index == 0){

877

989

fprintf(stderr, "No such interface: \"%s\"\n", interface);

905

1017

goto end;

906

1018

}

907

1019

908

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

909

{

910

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

911

if(sd < 0) {

912

perror("socket");

913

exitcode = EXIT_FAILURE;

914

goto end;

915

}

916

strcpy(network.ifr_name, interface); /* Spurious warning */

917

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

918

if(ret == -1){

919

perror("ioctl SIOCGIFFLAGS");

920

exitcode = EXIT_FAILURE;

921

goto end;

922

}

923

if((network.ifr_flags & IFF_UP) == 0){

924

network.ifr_flags |= IFF_UP;

925

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

926

if(ret == -1){

927

perror("ioctl SIOCSIFFLAGS");

928

exitcode = EXIT_FAILURE;

929

goto end;

930

}

931

}

932

close(sd);

933

}

934

935

1020

if (not debug){

936

1021

avahi_set_log_function(empty_log);

937

1022

}

947

1032

exitcode = EXIT_FAILURE;

948

1033

goto end;

949

1034

}

950

1035

951

1036

{

952

1037

AvahiServerConfig config;

953

1038

/* Do not publish any local Zeroconf records */

956

1041

config.publish_addresses = 0;

957

1042

config.publish_workstation = 0;

958

1043

config.publish_domain = 0;

959

1044

960

1045

/* Allocate a new server */

961

1046

mc.server = avahi_server_new(avahi_simple_poll_get

962

1047

(mc.simple_poll), &config, NULL,

963

1048

NULL, &error);

964

1049

965

1050

/* Free the Avahi configuration data */

966

1051

avahi_server_config_free(&config);

967

1052

}

987

1072

}

988

1073

989

1074

/* Run the main loop */

990

1075

991

1076

if (debug){

992

1077

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

993

1078

}

995

1080

avahi_simple_poll_loop(mc.simple_poll);

996

1081

997

1082

end:

998

1083

999

1084

if (debug){

1000

1085

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

1001

1086

}

1006

1091

1007

1092

if (mc.server != NULL)

1008

1093

avahi_server_free(mc.server);

1009

1094

1010

1095

if (mc.simple_poll != NULL)

1011

1096

avahi_simple_poll_free(mc.simple_poll);

1012

free(pubkeyfile);

1013

free(seckeyfile);

1014

1097

1015

1098

if (gnutls_initalized){

1016

gnutls_certificate_free_credentials (mc.cred);

1099

gnutls_certificate_free_credentials(mc.cred);

1017

1100

gnutls_global_deinit ();

1018

1101

}

1019

1102

1103

if(pgpme_initalized){

1104

gpgme_release(mc.ctx);

1105

}

1106

1107

/* Removes the temp directory used by GPGME */

1108

if(tempdir[0] != '\0'){

1109

DIR *d;

1110

struct dirent *direntry;

1111

d = opendir(tempdir);

1112

if(d == NULL){

1113

perror("opendir");

1114

} else {

1115

while(true){

1116

direntry = readdir(d);

1117

if(direntry == NULL){

1118

break;

1119

}

1120

if (direntry->d_type == DT_REG){

1121

char *fullname = NULL;

1122

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

1123

direntry->d_name);

1124

if(ret < 0){

1125

perror("asprintf");

1126

continue;

1127

}

1128

ret = unlink(fullname);

1129

if(ret == -1){

1130

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

1131

fullname, strerror(errno));

1132

}

1133

free(fullname);

1134

}

1135

}

1136

}

1137

ret = rmdir(tempdir);

1138

if(ret == -1){

1139

perror("rmdir");

1140

}

1141

}

1142

1020

1143

return exitcode;

1021

1144

}