/mandos/release : revision 55

32

#define _LARGEFILE_SOURCE

33

#define _FILE_OFFSET_BITS 64

34

35

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

35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

36

37

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

38

stdout, ferror() */

37

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

38

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() */

45

strerror(), memcpy(), strcpy() */

46

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

47

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

48

IFF_UP */

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 */

51

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

52

uid_t, gid_t */

52

53

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

53

54

struct in6_addr, inet_pton(),

54

55

connect() */

55

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

56

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

57

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

58

56

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

59

57

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

60

58

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

61

59

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

62

60

SIOCSIFFLAGS, if_indextoname(),

63

61

if_nametoindex(), IF_NAMESIZE */

64

#include <netinet/in.h>

65

62

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

66

63

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

67

64

setgid() */

65

#include <netinet/in.h>

68

66

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

69

67

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

70

68

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

84

82

#include <avahi-common/error.h>

85

83

86

84

/* GnuTLS */

87

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

88

functions:

85

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

89

86

gnutls_*

90

87

init_gnutls_session(),

91

88

GNUTLS_* */

93

90

GNUTLS_OPENPGP_FMT_BASE64 */

94

91

95

92

/* GPGME */

96

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

97

functions:

93

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

98

94

gpgme_*

99

95

GPGME_PROTOCOL_OpenPGP,

100

96

GPG_ERR_NO_* */

101

97

102

98

#define BUFFER_SIZE 256

103

99

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

100

bool debug = false;

101

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

113

102

static const char mandos_protocol_version[] = "1";

114

const char *argp_program_version = "password-request 1.0";

103

const char *argp_program_version = "mandosclient 0.9";

115

104

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

116

105

117

106

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

122

111

unsigned int dh_bits;

123

112

gnutls_dh_params_t dh_params;

124

113

const char *priority;

125

gpgme_ctx_t ctx;

126

114

} mandos_context;

127

115

128

116

/*

143

131

}

144

132

145

133

/*

146

* Initialize GPGME.

134

* Decrypt OpenPGP data using keyrings in HOMEDIR.

135

* Returns -1 on error

147

136

*/

148

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

149

const char *pubkey, const char *tempdir){

150

int ret;

137

static ssize_t pgp_packet_decrypt (const char *cryptotext,

138

size_t crypto_size,

139

char **plaintext,

140

const char *homedir){

141

gpgme_data_t dh_crypto, dh_plain;

142

gpgme_ctx_t ctx;

151

143

gpgme_error_t rc;

144

ssize_t ret;

145

size_t plaintext_capacity = 0;

146

ssize_t plaintext_length = 0;

152

147

gpgme_engine_info_t engine_info;

153

148

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

190

149

if (debug){

191

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

150

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

192

151

}

193

152

194

153

/* Init GPGME */

197

156

if (rc != GPG_ERR_NO_ERROR){

198

157

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

199

158

gpgme_strsource(rc), gpgme_strerror(rc));

200

return false;

159

return -1;

201

160

}

202

161

203

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

162

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

204

163

rc = gpgme_get_engine_info (&engine_info);

205

164

if (rc != GPG_ERR_NO_ERROR){

206

165

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

207

166

gpgme_strsource(rc), gpgme_strerror(rc));

208

return false;

167

return -1;

209

168

}

210

169

while(engine_info != NULL){

211

170

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

212

171

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

213

engine_info->file_name, tempdir);

172

engine_info->file_name, homedir);

214

173

break;

215

174

}

216

175

engine_info = engine_info->next;

217

176

}

218

177

if(engine_info == NULL){

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");

178

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

179

return -1;

254

180

}

255

181

256

182

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

271

197

return -1;

272

198

}

273

199

200

/* Create new GPGME "context" */

201

rc = gpgme_new(&ctx);

202

if (rc != GPG_ERR_NO_ERROR){

203

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

204

gpgme_strsource(rc), gpgme_strerror(rc));

205

plaintext_length = -1;

206

goto decrypt_end;

207

}

208

274

209

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

275

210

data buffer */

276

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

211

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

277

212

if (rc != GPG_ERR_NO_ERROR){

278

213

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

279

214

gpgme_strsource(rc), gpgme_strerror(rc));

280

215

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

}

309

216

goto decrypt_end;

310

217

}

311

218

313

220

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

314

221

}

315

222

223

if (debug){

224

gpgme_decrypt_result_t result;

225

result = gpgme_op_decrypt_result(ctx);

226

if (result == NULL){

227

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

228

} else {

229

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

230

result->unsupported_algorithm);

231

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

232

result->wrong_key_usage);

233

if(result->file_name != NULL){

234

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

235

}

236

gpgme_recipient_t recipient;

237

recipient = result->recipients;

238

if(recipient){

239

while(recipient != NULL){

240

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

241

gpgme_pubkey_algo_name(recipient->pubkey_algo));

242

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

243

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

244

recipient->status == GPG_ERR_NO_SECKEY

245

? "No" : "Yes");

246

recipient = recipient->next;

247

}

248

}

249

}

250

}

251

316

252

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

317

253

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

318

254

perror("pgpme_data_seek");

345

281

}

346

282

plaintext_length += ret;

347

283

}

348

284

349

285

if(debug){

350

286

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

351

287

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

365

301

}

366

302

367

303

static const char * safer_gnutls_strerror (int value) {

368

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

304

const char *ret = gnutls_strerror (value);

369

305

if (ret == NULL)

370

306

ret = "(unknown)";

371

307

return ret;

378

314

}

379

315

380

316

static int init_gnutls_global(mandos_context *mc,

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

317

const char *pubkeyfile,

318

const char *seckeyfile){

383

319

int ret;

384

320

385

321

if(debug){

404

340

/* OpenPGP credentials */

405

341

gnutls_certificate_allocate_credentials(&mc->cred);

406

342

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

343

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

409

344

safer_gnutls_strerror(ret));

410

345

gnutls_global_deinit ();

411

346

return -1;

412

347

}

413

348

414

349

if(debug){

415

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

416

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

417

seckeyfilename);

350

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

351

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

352

seckeyfile);

418

353

}

419

354

420

355

ret = gnutls_certificate_set_openpgp_key_file

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

356

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

423

357

if (ret != GNUTLS_E_SUCCESS) {

424

358

fprintf(stderr,

425

359

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

426

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

427

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

360

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

361

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

428

362

safer_gnutls_strerror(ret));

429

363

goto globalfail;

430

364

}

444

378

}

445

379

446

380

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

447

381

448

382

return 0;

449

383

450

384

globalfail:

451

385

452

386

gnutls_certificate_free_credentials(mc->cred);

453

387

gnutls_global_deinit();

454

388

return -1;

389

455

390

}

456

391

457

392

static int init_gnutls_session(mandos_context *mc,

520

455

}

521

456

522

457

if(debug){

523

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

524

"\n", ip, port);

458

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

459

ip, port);

525

460

}

526

461

527

462

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

529

464

perror("socket");

530

465

return -1;

531

466

}

532

467

533

468

if(debug){

534

469

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

535

470

perror("if_indextoname");

538

473

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

539

474

}

540

475

541

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

476

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

542

477

to.in6.sin6_family = AF_INET6;

543

478

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

544

479

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

551

486

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

552

487

return -1;

553

488

}

554

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

489

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

555

490

556

491

to.in6.sin6_scope_id = (uint32_t)if_index;

557

492

558

493

if(debug){

559

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

560

port);

494

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

561

495

char addrstr[INET6_ADDRSTRLEN] = "";

562

496

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

563

497

sizeof(addrstr)) == NULL){

574

508

perror("connect");

575

509

return -1;

576

510

}

577

511

578

512

const char *out = mandos_protocol_version;

579

513

written = 0;

580

514

while (true){

598

532

}

599

533

}

600

534

}

601

535

602

536

if(debug){

603

537

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

604

538

}

605

539

606

540

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

607

541

608

542

do{

609

543

ret = gnutls_handshake (session);

610

544

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

624

558

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

625

559

ip);

626

560

}

627

561

628

562

while(true){

629

563

buffer_capacity = adjustbuffer(&buffer, buffer_length,

630

564

buffer_capacity);

674

608

gnutls_bye (session, GNUTLS_SHUT_RDWR);

675

609

676

610

if (buffer_length > 0){

677

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

611

decrypted_buffer_size = pgp_packet_decrypt(buffer,

678

612

buffer_length,

679

&decrypted_buffer);

613

&decrypted_buffer,

614

keydir);

680

615

if (decrypted_buffer_size >= 0){

681

616

written = 0;

682

617

while(written < (size_t) decrypted_buffer_size){

697

632

} else {

698

633

retval = -1;

699

634

}

700

} else {

701

retval = -1;

702

635

}

703

636

704

637

/* Shutdown procedure */

705

638

706

639

mandos_end:

707

640

free(buffer);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

709

if(ret == -1){

710

perror("close");

711

}

641

close(tcp_sd);

712

642

gnutls_deinit (session);

713

643

return retval;

714

644

}

728

658

flags,

729

659

void* userdata) {

730

660

mandos_context *mc = userdata;

731

assert(r);

661

assert(r); /* Spurious warning */

732

662

733

663

/* Called whenever a service has been resolved successfully or

734

664

timed out */

746

676

char ip[AVAHI_ADDRESS_STR_MAX];

747

677

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

748

678

if(debug){

749

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

750

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

751

interface, port);

679

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

680

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

752

681

}

753

682

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

754

683

if (ret == 0){

755

avahi_simple_poll_quit(mc->simple_poll);

684

exit(EXIT_SUCCESS);

756

685

}

757

686

}

758

687

}

770

699

flags,

771

700

void* userdata) {

772

701

mandos_context *mc = userdata;

773

assert(b);

702

assert(b); /* Spurious warning */

774

703

775

704

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

776

705

is removed from the LAN */

810

739

}

811

740

}

812

741

742

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

743

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

744

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

745

size_t f_len = strlen(first);

746

size_t s_len = strlen(second);

747

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

748

if (tmp == NULL){

749

return NULL;

750

}

751

if(f_len > 0){

752

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

753

}

754

tmp[f_len] = '/';

755

if(s_len > 0){

756

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

757

}

758

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

759

return tmp;

760

}

761

762

813

763

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

814

764

AvahiSServiceBrowser *sb = NULL;

815

765

int error;

821

771

uid_t uid;

822

772

gid_t gid;

823

773

char *connect_to = NULL;

824

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

825

774

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

826

const char *seckey = PATHDIR "/" SECKEY;

827

const char *pubkey = PATHDIR "/" PUBKEY;

828

775

const char *pubkeyfile = "pubkey.txt";

776

const char *seckeyfile = "seckey.txt";

829

777

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

830

.dh_bits = 1024, .priority = "SECURE256"

831

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

778

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

832

779

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

834

780

835

781

{

836

782

struct argp_option options[] = {

837

783

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

838

784

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

839

785

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

840

.arg = "ADDRESS:PORT",

841

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

786

.arg = "IP",

787

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

842

788

.group = 1 },

843

789

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

844

.arg = "NAME",

845

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

846

" servers",

790

.arg = "INTERFACE",

791

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

792

.group = 1 },

793

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

794

.arg = "KEYDIR",

795

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

847

796

.group = 1 },

848

797

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

849

.arg = "FILE",

850

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

798

.arg = "SECKEY",

799

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

851

800

.group = 1 },

852

801

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

853

.arg = "FILE",

854

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

802

.arg = "PUBKEY",

803

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

855

804

.group = 2 },

856

805

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

857

806

.arg = "BITS",

858

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

859

" Diffie-Hellman key exchange",

807

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

860

808

.group = 2 },

861

809

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

862

.arg = "STRING",

863

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

864

.group = 1 },

810

.arg = "PRIORITY",

811

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

865

812

{ .name = NULL }

866

813

};

814

867

815

868

816

error_t parse_opt (int key, char *arg,

869

817

struct argp_state *state) {

870

818

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

871

819

a pointer to our plugin list pointer. */

872

820

switch (key) {

873

case 128: /* --debug */

821

case 128:

874

822

debug = true;

875

823

break;

876

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

824

case 'c':

877

825

connect_to = arg;

878

826

break;

879

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

827

case 'i':

880

828

interface = arg;

881

829

break;

882

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

883

seckey = arg;

884

break;

885

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

886

pubkey = arg;

887

break;

888

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

830

case 'd':

831

keydir = arg;

832

break;

833

case 's':

834

seckeyfile = arg;

835

break;

836

case 'p':

837

pubkeyfile = arg;

838

break;

839

case 129:

889

840

errno = 0;

890

841

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

891

842

if (errno){

893

844

exit(EXIT_FAILURE);

894

845

}

895

846

break;

896

case 130: /* --priority */

847

case 130:

897

848

mc.priority = arg;

898

849

break;

899

850

case ARGP_KEY_ARG:

900

851

argp_usage (state);

901

case ARGP_KEY_END:

902

852

break;

853

case ARGP_KEY_END:

854

break;

903

855

default:

904

856

return ARGP_ERR_UNKNOWN;

905

857

}

906

858

return 0;

907

859

}

908

860

909

861

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

910

862

.args_doc = "",

911

863

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

912

" passwords from a Mandos server" };

864

" passwords from mandos server" };

913

865

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

914

866

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

867

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

868

exitcode = EXIT_FAILURE;

869

goto end;

870

}

871

}

872

873

pubkeyfile = combinepath(keydir, pubkeyfile);

874

if (pubkeyfile == NULL){

875

perror("combinepath");

876

exitcode = EXIT_FAILURE;

877

goto end;

878

}

879

880

seckeyfile = combinepath(keydir, seckeyfile);

881

if (seckeyfile == NULL){

882

perror("combinepath");

883

goto end;

884

}

885

886

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

887

if (ret == -1){

888

fprintf(stderr, "init_gnutls_global\n");

889

goto end;

890

} else {

891

gnutls_initalized = true;

892

}

893

951

894

uid = getuid();

952

895

gid = getgid();

953

896

954

897

ret = setuid(uid);

955

898

if (ret == -1){

956

899

perror("setuid");

961

904

perror("setgid");

962

905

}

963

906

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

987

907

if_index = (AvahiIfIndex) if_nametoindex(interface);

988

908

if(if_index == 0){

989

909

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

1017

937

goto end;

1018

938

}

1019

939

940

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

941

{

942

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

943

if(sd < 0) {

944

perror("socket");

945

exitcode = EXIT_FAILURE;

946

goto end;

947

}

948

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

949

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

950

if(ret == -1){

951

perror("ioctl SIOCGIFFLAGS");

952

exitcode = EXIT_FAILURE;

953

goto end;

954

}

955

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

956

network.ifr_flags |= IFF_UP;

957

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

958

if(ret == -1){

959

perror("ioctl SIOCSIFFLAGS");

960

exitcode = EXIT_FAILURE;

961

goto end;

962

}

963

}

964

close(sd);

965

}

966

1020

967

if (not debug){

1021

968

avahi_set_log_function(empty_log);

1022

969

}

1032

979

exitcode = EXIT_FAILURE;

1033

980

goto end;

1034

981

}

1035

982

1036

983

{

1037

984

AvahiServerConfig config;

1038

985

/* Do not publish any local Zeroconf records */

1041

988

config.publish_addresses = 0;

1042

989

config.publish_workstation = 0;

1043

990

config.publish_domain = 0;

1044

991

1045

992

/* Allocate a new server */

1046

993

mc.server = avahi_server_new(avahi_simple_poll_get

1047

994

(mc.simple_poll), &config, NULL,

1048

995

NULL, &error);

1049

996

1050

997

/* Free the Avahi configuration data */

1051

998

avahi_server_config_free(&config);

1052

999

}

1072

1019

}

1073

1020

1074

1021

/* Run the main loop */

1075

1022

1076

1023

if (debug){

1077

1024

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

1078

1025

}

1080

1027

avahi_simple_poll_loop(mc.simple_poll);

1081

1028

1082

1029

end:

1083

1030

1084

1031

if (debug){

1085

1032

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

1086

1033

}

1091

1038

1092

1039

if (mc.server != NULL)

1093

1040

avahi_server_free(mc.server);

1094

1041

1095

1042

if (mc.simple_poll != NULL)

1096

1043

avahi_simple_poll_free(mc.simple_poll);

1097

1044

free(pubkeyfile);

1045

free(seckeyfile);

1046

1098

1047

if (gnutls_initalized){

1099

1048

gnutls_certificate_free_credentials(mc.cred);

1100

1049

gnutls_global_deinit ();

1101

1050

}

1102

1051

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

1143

1052

return exitcode;

1144

1053

}