/mandos/trunk : revision 63

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(),

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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 */

53

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

52

54

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

53

55

struct in6_addr, inet_pton(),

54

56

connect() */

55

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

56

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

57

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

58

57

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

59

58

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

60

59

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

61

60

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

62

61

SIOCSIFFLAGS, if_indextoname(),

63

62

if_nametoindex(), IF_NAMESIZE */

64

#include <netinet/in.h>

65

63

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

66

64

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

67

65

setgid() */

66

#include <netinet/in.h>

68

67

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

69

68

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

70

69

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

84

83

#include <avahi-common/error.h>

85

84

86

85

/* GnuTLS */

87

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

88

functions:

86

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

89

87

gnutls_*

90

88

init_gnutls_session(),

91

89

GNUTLS_* */

93

91

GNUTLS_OPENPGP_FMT_BASE64 */

94

92

95

93

/* GPGME */

96

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

97

functions:

94

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

98

95

gpgme_*

99

96

GPGME_PROTOCOL_OpenPGP,

100

97

GPG_ERR_NO_* */

101

98

102

99

#define BUFFER_SIZE 256

103

100

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

101

bool debug = false;

102

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

113

103

static const char mandos_protocol_version[] = "1";

114

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

104

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

115

105

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

116

106

117

107

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

122

112

unsigned int dh_bits;

123

113

gnutls_dh_params_t dh_params;

124

114

const char *priority;

125

gpgme_ctx_t ctx;

126

115

} mandos_context;

127

116

128

117

/*

143

132

}

144

133

145

134

/*

146

* Initialize GPGME.

135

* Decrypt OpenPGP data using keyrings in HOMEDIR.

136

* Returns -1 on error

147

137

*/

148

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

149

const char *pubkey, const char *tempdir){

150

int ret;

138

static ssize_t pgp_packet_decrypt (const char *cryptotext,

139

size_t crypto_size,

140

char **plaintext,

141

const char *homedir){

142

gpgme_data_t dh_crypto, dh_plain;

143

gpgme_ctx_t ctx;

151

144

gpgme_error_t rc;

145

ssize_t ret;

146

size_t plaintext_capacity = 0;

147

ssize_t plaintext_length = 0;

152

148

gpgme_engine_info_t engine_info;

153

149

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

150

if (debug){

191

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

151

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

192

152

}

193

153

194

154

/* Init GPGME */

197

157

if (rc != GPG_ERR_NO_ERROR){

198

158

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

199

159

gpgme_strsource(rc), gpgme_strerror(rc));

200

return false;

160

return -1;

201

161

}

202

162

203

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

163

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

204

164

rc = gpgme_get_engine_info (&engine_info);

205

165

if (rc != GPG_ERR_NO_ERROR){

206

166

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

207

167

gpgme_strsource(rc), gpgme_strerror(rc));

208

return false;

168

return -1;

209

169

}

210

170

while(engine_info != NULL){

211

171

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

212

172

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

213

engine_info->file_name, tempdir);

173

engine_info->file_name, homedir);

214

174

break;

215

175

}

216

176

engine_info = engine_info->next;

217

177

}

218

178

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");

179

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

180

return -1;

254

181

}

255

182

256

183

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

271

198

return -1;

272

199

}

273

200

201

/* Create new GPGME "context" */

202

rc = gpgme_new(&ctx);

203

if (rc != GPG_ERR_NO_ERROR){

204

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

205

gpgme_strsource(rc), gpgme_strerror(rc));

206

plaintext_length = -1;

207

goto decrypt_end;

208

}

209

274

210

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

275

211

data buffer */

276

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

212

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

277

213

if (rc != GPG_ERR_NO_ERROR){

278

214

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

279

215

gpgme_strsource(rc), gpgme_strerror(rc));

280

216

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

217

goto decrypt_end;

310

218

}

311

219

313

221

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

314

222

}

315

223

224

if (debug){

225

gpgme_decrypt_result_t result;

226

result = gpgme_op_decrypt_result(ctx);

227

if (result == NULL){

228

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

229

} else {

230

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

231

result->unsupported_algorithm);

232

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

233

result->wrong_key_usage);

234

if(result->file_name != NULL){

235

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

236

}

237

gpgme_recipient_t recipient;

238

recipient = result->recipients;

239

if(recipient){

240

while(recipient != NULL){

241

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

242

gpgme_pubkey_algo_name(recipient->pubkey_algo));

243

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

244

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

245

recipient->status == GPG_ERR_NO_SECKEY

246

? "No" : "Yes");

247

recipient = recipient->next;

248

}

249

}

250

}

251

}

252

316

253

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

317

254

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

318

255

perror("pgpme_data_seek");

345

282

}

346

283

plaintext_length += ret;

347

284

}

348

285

349

286

if(debug){

350

287

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

351

288

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

365

302

}

366

303

367

304

static const char * safer_gnutls_strerror (int value) {

368

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

305

const char *ret = gnutls_strerror (value);

369

306

if (ret == NULL)

370

307

ret = "(unknown)";

371

308

return ret;

378

315

}

379

316

380

317

static int init_gnutls_global(mandos_context *mc,

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

318

const char *pubkeyfile,

319

const char *seckeyfile){

383

320

int ret;

384

321

385

322

if(debug){

404

341

/* OpenPGP credentials */

405

342

gnutls_certificate_allocate_credentials(&mc->cred);

406

343

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

344

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

409

345

safer_gnutls_strerror(ret));

410

346

gnutls_global_deinit ();

411

347

return -1;

412

348

}

413

349

414

350

if(debug){

415

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

416

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

417

seckeyfilename);

351

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

352

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

353

seckeyfile);

418

354

}

419

355

420

356

ret = gnutls_certificate_set_openpgp_key_file

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

357

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

423

358

if (ret != GNUTLS_E_SUCCESS) {

424

359

fprintf(stderr,

425

360

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

426

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

427

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

361

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

362

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

428

363

safer_gnutls_strerror(ret));

429

364

goto globalfail;

430

365

}

444

379

}

445

380

446

381

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

447

382

448

383

return 0;

449

384

450

385

globalfail:

451

386

452

387

gnutls_certificate_free_credentials(mc->cred);

453

388

gnutls_global_deinit();

454

389

return -1;

390

455

391

}

456

392

457

393

static int init_gnutls_session(mandos_context *mc,

529

465

perror("socket");

530

466

return -1;

531

467

}

532

468

533

469

if(debug){

534

470

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

535

471

perror("if_indextoname");

538

474

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

539

475

}

540

476

541

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

477

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

542

478

to.in6.sin6_family = AF_INET6;

543

479

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

544

480

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

551

487

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

552

488

return -1;

553

489

}

554

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

490

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

555

491

556

492

to.in6.sin6_scope_id = (uint32_t)if_index;

557

493

574

510

perror("connect");

575

511

return -1;

576

512

}

577

513

578

514

const char *out = mandos_protocol_version;

579

515

written = 0;

580

516

while (true){

598

534

}

599

535

}

600

536

}

601

537

602

538

if(debug){

603

539

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

604

540

}

605

541

606

542

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

607

543

608

544

do{

609

545

ret = gnutls_handshake (session);

610

546

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

624

560

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

625

561

ip);

626

562

}

627

563

628

564

while(true){

629

565

buffer_capacity = adjustbuffer(&buffer, buffer_length,

630

566

buffer_capacity);

674

610

gnutls_bye (session, GNUTLS_SHUT_RDWR);

675

611

676

612

if (buffer_length > 0){

677

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

613

decrypted_buffer_size = pgp_packet_decrypt(buffer,

678

614

buffer_length,

679

&decrypted_buffer);

615

&decrypted_buffer,

616

keydir);

680

617

if (decrypted_buffer_size >= 0){

681

618

written = 0;

682

619

while(written < (size_t) decrypted_buffer_size){

697

634

} else {

698

635

retval = -1;

699

636

}

700

} else {

701

retval = -1;

702

637

}

703

638

704

639

/* Shutdown procedure */

705

640

706

641

mandos_end:

707

642

free(buffer);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

709

if(ret == -1){

710

perror("close");

711

}

643

close(tcp_sd);

712

644

gnutls_deinit (session);

713

645

return retval;

714

646

}

728

660

flags,

729

661

void* userdata) {

730

662

mandos_context *mc = userdata;

731

assert(r);

663

assert(r); /* Spurious warning */

732

664

733

665

/* Called whenever a service has been resolved successfully or

734

666

timed out */

752

684

}

753

685

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

754

686

if (ret == 0){

755

avahi_simple_poll_quit(mc->simple_poll);

687

exit(EXIT_SUCCESS);

756

688

}

757

689

}

758

690

}

770

702

flags,

771

703

void* userdata) {

772

704

mandos_context *mc = userdata;

773

assert(b);

705

assert(b); /* Spurious warning */

774

706

775

707

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

776

708

is removed from the LAN */

810

742

}

811

743

}

812

744

745

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

746

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

747

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

748

size_t f_len = strlen(first);

749

size_t s_len = strlen(second);

750

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

751

if (tmp == NULL){

752

return NULL;

753

}

754

if(f_len > 0){

755

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

756

}

757

tmp[f_len] = '/';

758

if(s_len > 0){

759

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

760

}

761

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

762

return tmp;

763

}

764

765

813

766

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

814

767

AvahiSServiceBrowser *sb = NULL;

815

768

int error;

821

774

uid_t uid;

822

775

gid_t gid;

823

776

char *connect_to = NULL;

824

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

825

777

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

826

const char *seckey = PATHDIR "/" SECKEY;

827

const char *pubkey = PATHDIR "/" PUBKEY;

828

778

const char *pubkeyfile = "pubkey.txt";

779

const char *seckeyfile = "seckey.txt";

829

780

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

830

.dh_bits = 1024, .priority = "SECURE256"

831

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

781

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

832

782

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

834

783

835

784

{

836

785

struct argp_option options[] = {

837

786

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

838

787

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

839

788

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

840

.arg = "ADDRESS:PORT",

841

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

789

.arg = "IP",

790

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

842

791

.group = 1 },

843

792

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

844

.arg = "NAME",

845

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

846

" servers",

793

.arg = "INTERFACE",

794

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

795

.group = 1 },

796

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

797

.arg = "KEYDIR",

798

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

847

799

.group = 1 },

848

800

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

849

.arg = "FILE",

850

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

801

.arg = "SECKEY",

802

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

851

803

.group = 1 },

852

804

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

853

.arg = "FILE",

854

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

805

.arg = "PUBKEY",

806

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

855

807

.group = 2 },

856

808

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

857

809

.arg = "BITS",

858

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

859

" Diffie-Hellman key exchange",

810

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

860

811

.group = 2 },

861

812

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

862

.arg = "STRING",

863

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

864

.group = 1 },

813

.arg = "PRIORITY",

814

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

865

815

{ .name = NULL }

866

816

};

817

867

818

868

819

error_t parse_opt (int key, char *arg,

869

820

struct argp_state *state) {

870

821

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

871

822

a pointer to our plugin list pointer. */

872

823

switch (key) {

873

case 128: /* --debug */

824

case 128:

874

825

debug = true;

875

826

break;

876

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

827

case 'c':

877

828

connect_to = arg;

878

829

break;

879

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

830

case 'i':

880

831

interface = arg;

881

832

break;

882

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

883

seckey = arg;

884

break;

885

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

886

pubkey = arg;

887

break;

888

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

833

case 'd':

834

keydir = arg;

835

break;

836

case 's':

837

seckeyfile = arg;

838

break;

839

case 'p':

840

pubkeyfile = arg;

841

break;

842

case 129:

889

843

errno = 0;

890

844

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

891

845

if (errno){

893

847

exit(EXIT_FAILURE);

894

848

}

895

849

break;

896

case 130: /* --priority */

850

case 130:

897

851

mc.priority = arg;

898

852

break;

899

853

case ARGP_KEY_ARG:

900

854

argp_usage (state);

901

case ARGP_KEY_END:

902

855

break;

856

case ARGP_KEY_END:

857

break;

903

858

default:

904

859

return ARGP_ERR_UNKNOWN;

905

860

}

906

861

return 0;

907

862

}

908

863

909

864

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

910

865

.args_doc = "",

911

866

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

912

" passwords from a Mandos server" };

867

" passwords from mandos server" };

913

868

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

914

869

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

870

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

871

exitcode = EXIT_FAILURE;

872

goto end;

873

}

874

}

875

876

pubkeyfile = combinepath(keydir, pubkeyfile);

877

if (pubkeyfile == NULL){

878

perror("combinepath");

879

exitcode = EXIT_FAILURE;

880

goto end;

881

}

882

883

seckeyfile = combinepath(keydir, seckeyfile);

884

if (seckeyfile == NULL){

885

perror("combinepath");

886

goto end;

887

}

888

889

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

890

if (ret == -1){

891

fprintf(stderr, "init_gnutls_global\n");

892

goto end;

893

} else {

894

gnutls_initalized = true;

895

}

896

951

897

uid = getuid();

952

898

gid = getgid();

953

899

954

900

ret = setuid(uid);

955

901

if (ret == -1){

956

902

perror("setuid");

961

907

perror("setgid");

962

908

}

963

909

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

910

if_index = (AvahiIfIndex) if_nametoindex(interface);

988

911

if(if_index == 0){

989

912

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

1017

940

goto end;

1018

941

}

1019

942

943

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

944

{

945

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

946

if(sd < 0) {

947

perror("socket");

948

exitcode = EXIT_FAILURE;

949

goto end;

950

}

951

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

952

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

953

if(ret == -1){

954

perror("ioctl SIOCGIFFLAGS");

955

exitcode = EXIT_FAILURE;

956

goto end;

957

}

958

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

959

network.ifr_flags |= IFF_UP;

960

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

961

if(ret == -1){

962

perror("ioctl SIOCSIFFLAGS");

963

exitcode = EXIT_FAILURE;

964

goto end;

965

}

966

}

967

close(sd);

968

}

969

1020

970

if (not debug){

1021

971

avahi_set_log_function(empty_log);

1022

972

}

1032

982

exitcode = EXIT_FAILURE;

1033

983

goto end;

1034

984

}

1035

985

1036

986

{

1037

987

AvahiServerConfig config;

1038

988

/* Do not publish any local Zeroconf records */

1041

991

config.publish_addresses = 0;

1042

992

config.publish_workstation = 0;

1043

993

config.publish_domain = 0;

1044

994

1045

995

/* Allocate a new server */

1046

996

mc.server = avahi_server_new(avahi_simple_poll_get

1047

997

(mc.simple_poll), &config, NULL,

1048

998

NULL, &error);

1049

999

1050

1000

/* Free the Avahi configuration data */

1051

1001

avahi_server_config_free(&config);

1052

1002

}

1072

1022

}

1073

1023

1074

1024

/* Run the main loop */

1075

1025

1076

1026

if (debug){

1077

1027

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

1078

1028

}

1080

1030

avahi_simple_poll_loop(mc.simple_poll);

1081

1031

1082

1032

end:

1083

1033

1084

1034

if (debug){

1085

1035

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

1086

1036

}

1091

1041

1092

1042

if (mc.server != NULL)

1093

1043

avahi_server_free(mc.server);

1094

1044

1095

1045

if (mc.simple_poll != NULL)

1096

1046

avahi_simple_poll_free(mc.simple_poll);

1097

1047

free(pubkeyfile);

1048

free(seckeyfile);

1049

1098

1050

if (gnutls_initalized){

1099

1051

gnutls_certificate_free_credentials(mc.cred);

1100

1052

gnutls_global_deinit ();

1101

1053

}

1102

1054

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

1055

return exitcode;

1144

1056

}