/mandos/trunk : revision 181

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> /* fprintf(), stderr, fwrite(), stdout,

38

ferror() */

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

45

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

46

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

47

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

48

IFF_UP */

49

47

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

50

48

sockaddr_in6, PF_INET6,

51

49

SOCK_STREAM, INET6_ADDRSTRLEN,

52

uid_t, gid_t */

53

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

50

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

51

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

54

52

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

55

53

struct in6_addr, inet_pton(),

56

54

connect() */

55

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

56

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

57

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

57

58

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

58

59

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

59

60

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

60

61

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

61

62

SIOCSIFFLAGS, if_indextoname(),

62

63

if_nametoindex(), IF_NAMESIZE */

64

#include <netinet/in.h>

63

65

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

64

66

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

65

67

setgid() */

66

#include <netinet/in.h>

67

68

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

68

69

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

69

70

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

83

84

#include <avahi-common/error.h>

84

85

86

/* GnuTLS */

86

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

87

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

88

functions:

87

89

gnutls_*

88

90

init_gnutls_session(),

89

91

GNUTLS_* */

91

93

GNUTLS_OPENPGP_FMT_BASE64 */

92

94

93

95

/* GPGME */

94

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

96

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

97

functions:

95

98

gpgme_*

96

99

GPGME_PROTOCOL_OpenPGP,

97

100

GPG_ERR_NO_* */

98

101

99

102

#define BUFFER_SIZE 256

100

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

101

112

bool debug = false;

102

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

103

113

static const char mandos_protocol_version[] = "1";

104

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

114

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

105

115

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

106

116

107

117

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

112

122

unsigned int dh_bits;

113

123

gnutls_dh_params_t dh_params;

114

124

const char *priority;

125

gpgme_ctx_t ctx;

115

126

} mandos_context;

116

127

117

128

/*

132

143

}

133

144

134

145

/*

135

* Decrypt OpenPGP data using keyrings in HOMEDIR.

136

* Returns -1 on error

146

* Initialize GPGME.

137

147

*/

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;

148

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

149

const char *pubkey, const char *tempdir){

150

int ret;

144

151

gpgme_error_t rc;

145

ssize_t ret;

146

size_t plaintext_capacity = 0;

147

ssize_t plaintext_length = 0;

148

152

gpgme_engine_info_t engine_info;

149

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

150

190

if (debug){

151

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

191

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

152

192

}

153

193

154

194

/* Init GPGME */

157

197

if (rc != GPG_ERR_NO_ERROR){

158

198

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

159

199

gpgme_strsource(rc), gpgme_strerror(rc));

160

return -1;

200

return false;

161

201

}

162

202

163

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

203

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

164

204

rc = gpgme_get_engine_info (&engine_info);

165

205

if (rc != GPG_ERR_NO_ERROR){

166

206

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

167

207

gpgme_strsource(rc), gpgme_strerror(rc));

168

return -1;

208

return false;

169

209

}

170

210

while(engine_info != NULL){

171

211

if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){

172

212

gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,

173

engine_info->file_name, homedir);

213

engine_info->file_name, tempdir);

174

214

break;

175

215

}

176

216

engine_info = engine_info->next;

177

217

}

178

218

if(engine_info == NULL){

179

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

180

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");

181

254

}

182

255

183

256

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

198

271

return -1;

199

272

}

200

273

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

210

274

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

211

275

data buffer */

212

rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);

276

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

213

277

if (rc != GPG_ERR_NO_ERROR){

214

278

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

215

279

gpgme_strsource(rc), gpgme_strerror(rc));

216

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

}

217

309

goto decrypt_end;

218

310

}

219

311

221

313

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

222

314

}

223

315

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

253

316

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

254

317

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

255

perror("pgpme_data_seek");

318

perror("gpgme_data_seek");

256

319

plaintext_length = -1;

257

320

goto decrypt_end;

258

321

}

282

345

}

283

346

plaintext_length += ret;

284

347

}

285

348

286

349

if(debug){

287

350

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

288

351

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

302

365

}

303

366

304

367

static const char * safer_gnutls_strerror (int value) {

305

const char *ret = gnutls_strerror (value);

368

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

306

369

if (ret == NULL)

307

370

ret = "(unknown)";

308

371

return ret;

315

378

}

316

379

317

380

static int init_gnutls_global(mandos_context *mc,

318

const char *pubkeyfile,

319

const char *seckeyfile){

381

const char *pubkeyfilename,

382

const char *seckeyfilename){

320

383

int ret;

321

384

322

385

if(debug){

341

404

/* OpenPGP credentials */

342

405

gnutls_certificate_allocate_credentials(&mc->cred);

343

406

if (ret != GNUTLS_E_SUCCESS){

344

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

407

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

408

warning */

345

409

safer_gnutls_strerror(ret));

346

410

gnutls_global_deinit ();

347

411

return -1;

348

412

}

349

413

350

414

if(debug){

351

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

352

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

353

seckeyfile);

415

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

416

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

417

seckeyfilename);

354

418

}

355

419

356

420

ret = gnutls_certificate_set_openpgp_key_file

357

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

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

358

423

if (ret != GNUTLS_E_SUCCESS) {

359

424

fprintf(stderr,

360

425

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

361

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

362

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

426

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

427

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

363

428

safer_gnutls_strerror(ret));

364

429

goto globalfail;

365

430

}

379

444

}

380

445

381

446

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

382

447

383

448

return 0;

384

449

385

450

globalfail:

386

451

387

452

gnutls_certificate_free_credentials(mc->cred);

388

453

gnutls_global_deinit();

454

gnutls_dh_params_deinit(mc->dh_params);

389

455

return -1;

390

391

456

}

392

457

393

458

static int init_gnutls_session(mandos_context *mc,

465

530

perror("socket");

466

531

return -1;

467

532

}

468

533

469

534

if(debug){

470

535

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

471

536

perror("if_indextoname");

474

539

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

475

540

}

476

541

477

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

542

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

478

543

to.in6.sin6_family = AF_INET6;

479

544

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

480

545

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

487

552

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

488

553

return -1;

489

554

}

490

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

555

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

491

556

492

557

to.in6.sin6_scope_id = (uint32_t)if_index;

493

558

510

575

perror("connect");

511

576

return -1;

512

577

}

513

578

514

579

const char *out = mandos_protocol_version;

515

580

written = 0;

516

581

while (true){

534

599

}

535

600

}

536

601

}

537

602

538

603

if(debug){

539

604

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

540

605

}

541

606

542

607

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

543

608

544

609

do{

545

610

ret = gnutls_handshake (session);

546

611

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

560

625

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

561

626

ip);

562

627

}

563

628

564

629

while(true){

565

630

buffer_capacity = adjustbuffer(&buffer, buffer_length,

566

631

buffer_capacity);

610

675

gnutls_bye (session, GNUTLS_SHUT_RDWR);

611

676

612

677

if (buffer_length > 0){

613

decrypted_buffer_size = pgp_packet_decrypt(buffer,

678

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

614

679

buffer_length,

615

&decrypted_buffer,

616

keydir);

680

&decrypted_buffer);

617

681

if (decrypted_buffer_size >= 0){

618

682

written = 0;

619

683

while(written < (size_t) decrypted_buffer_size){

634

698

} else {

635

699

retval = -1;

636

700

}

701

} else {

702

retval = -1;

637

703

}

638

704

639

705

/* Shutdown procedure */

640

706

641

707

mandos_end:

642

708

free(buffer);

643

close(tcp_sd);

709

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

710

if(ret == -1){

711

perror("close");

712

}

644

713

gnutls_deinit (session);

645

714

return retval;

646

715

}

660

729

flags,

661

730

void* userdata) {

662

731

mandos_context *mc = userdata;

663

assert(r); /* Spurious warning */

732

assert(r);

664

733

665

734

/* Called whenever a service has been resolved successfully or

666

735

timed out */

684

753

}

685

754

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

686

755

if (ret == 0){

687

exit(EXIT_SUCCESS);

756

avahi_simple_poll_quit(mc->simple_poll);

688

757

}

689

758

}

690

759

}

702

771

flags,

703

772

void* userdata) {

704

773

mandos_context *mc = userdata;

705

assert(b); /* Spurious warning */

774

assert(b);

706

775

707

776

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

708

777

is removed from the LAN */

742

811

}

743

812

}

744

813

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

766

814

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

767

815

AvahiSServiceBrowser *sb = NULL;

768

816

int error;

774

822

uid_t uid;

775

823

gid_t gid;

776

824

char *connect_to = NULL;

825

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

777

826

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

778

const char *pubkeyfile = "pubkey.txt";

779

const char *seckeyfile = "seckey.txt";

827

const char *seckey = PATHDIR "/" SECKEY;

828

const char *pubkey = PATHDIR "/" PUBKEY;

829

780

830

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

781

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

831

.dh_bits = 1024, .priority = "SECURE256"

832

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

782

833

bool gnutls_initalized = false;

834

bool gpgme_initalized = false;

783

835

784

836

{

785

837

struct argp_option options[] = {

786

838

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

787

839

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

788

840

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

789

.arg = "IP",

790

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

841

.arg = "ADDRESS:PORT",

842

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

791

843

.group = 1 },

792

844

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

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",

845

.arg = "NAME",

846

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

847

" servers",

799

848

.group = 1 },

800

849

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

801

.arg = "SECKEY",

802

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

850

.arg = "FILE",

851

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

803

852

.group = 1 },

804

853

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

805

.arg = "PUBKEY",

806

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

854

.arg = "FILE",

855

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

807

856

.group = 2 },

808

857

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

809

858

.arg = "BITS",

810

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

859

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

860

" Diffie-Hellman key exchange",

811

861

.group = 2 },

812

862

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

813

.arg = "PRIORITY",

814

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

863

.arg = "STRING",

864

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

865

.group = 1 },

815

866

{ .name = NULL }

816

867

};

817

818

868

819

869

error_t parse_opt (int key, char *arg,

820

870

struct argp_state *state) {

821

871

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

822

872

a pointer to our plugin list pointer. */

823

873

switch (key) {

824

case 128:

874

case 128: /* --debug */

825

875

debug = true;

826

876

break;

827

case 'c':

877

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

828

878

connect_to = arg;

829

879

break;

830

case 'i':

880

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

831

881

interface = arg;

832

882

break;

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:

883

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

884

seckey = arg;

885

break;

886

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

887

pubkey = arg;

888

break;

889

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

843

890

errno = 0;

844

891

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

845

892

if (errno){

847

894

exit(EXIT_FAILURE);

848

895

}

849

896

break;

850

case 130:

897

case 130: /* --priority */

851

898

mc.priority = arg;

852

899

break;

853

900

case ARGP_KEY_ARG:

854

901

argp_usage (state);

902

case ARGP_KEY_END:

855

903

break;

856

case ARGP_KEY_END:

857

break;

858

904

default:

859

905

return ARGP_ERR_UNKNOWN;

860

906

}

861

907

return 0;

862

908

}

863

909

864

910

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

865

911

.args_doc = "",

866

912

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

867

" passwords from mandos server" };

913

" passwords from a Mandos server" };

868

914

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

869

915

if (ret == ARGP_ERR_UNKNOWN){

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

916

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

917

exitcode = EXIT_FAILURE;

918

goto end;

919

}

920

}

921

922

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

923

{

924

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

925

if(sd < 0) {

926

perror("socket");

927

exitcode = EXIT_FAILURE;

928

goto end;

929

}

930

strcpy(network.ifr_name, interface);

931

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

932

if(ret == -1){

933

perror("ioctl SIOCGIFFLAGS");

934

exitcode = EXIT_FAILURE;

935

goto end;

936

}

937

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

938

network.ifr_flags |= IFF_UP;

939

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

940

if(ret == -1){

941

perror("ioctl SIOCSIFFLAGS");

942

exitcode = EXIT_FAILURE;

943

goto end;

944

}

945

}

946

ret = TEMP_FAILURE_RETRY(close(sd));

947

if(ret == -1){

948

perror("close");

949

}

950

}

951

897

952

uid = getuid();

898

953

gid = getgid();

899

954

900

955

ret = setuid(uid);

901

956

if (ret == -1){

902

957

perror("setuid");

907

962

perror("setgid");

908

963

}

909

964

965

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

966

if (ret == -1){

967

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

968

exitcode = EXIT_FAILURE;

969

goto end;

970

} else {

971

gnutls_initalized = true;

972

}

973

974

if(mkdtemp(tempdir) == NULL){

975

perror("mkdtemp");

976

tempdir[0] = '\0';

977

goto end;

978

}

979

980

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

981

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

982

exitcode = EXIT_FAILURE;

983

goto end;

984

} else {

985

gpgme_initalized = true;

986

}

987

910

988

if_index = (AvahiIfIndex) if_nametoindex(interface);

911

989

if(if_index == 0){

912

990

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

940

1018

goto end;

941

1019

}

942

1020

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

970

1021

if (not debug){

971

1022

avahi_set_log_function(empty_log);

972

1023

}

982

1033

exitcode = EXIT_FAILURE;

983

1034

goto end;

984

1035

}

985

1036

986

1037

{

987

1038

AvahiServerConfig config;

988

1039

/* Do not publish any local Zeroconf records */

991

1042

config.publish_addresses = 0;

992

1043

config.publish_workstation = 0;

993

1044

config.publish_domain = 0;

994

1045

995

1046

/* Allocate a new server */

996

1047

mc.server = avahi_server_new(avahi_simple_poll_get

997

1048

(mc.simple_poll), &config, NULL,

998

1049

NULL, &error);

999

1050

1000

1051

/* Free the Avahi configuration data */

1001

1052

avahi_server_config_free(&config);

1002

1053

}

1022

1073

}

1023

1074

1024

1075

/* Run the main loop */

1025

1076

1026

1077

if (debug){

1027

1078

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

1028

1079

}

1030

1081

avahi_simple_poll_loop(mc.simple_poll);

1031

1082

1032

1083

end:

1033

1084

1034

1085

if (debug){

1035

1086

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

1036

1087

}

1041

1092

1042

1093

if (mc.server != NULL)

1043

1094

avahi_server_free(mc.server);

1044

1095

1045

1096

if (mc.simple_poll != NULL)

1046

1097

avahi_simple_poll_free(mc.simple_poll);

1047

free(pubkeyfile);

1048

free(seckeyfile);

1049

1098

1050

1099

if (gnutls_initalized){

1051

1100

gnutls_certificate_free_credentials(mc.cred);

1052

1101

gnutls_global_deinit ();

1053

}

1054

1102

gnutls_dh_params_deinit(mc.dh_params);

1103

}

1104

1105

if(gpgme_initalized){

1106

gpgme_release(mc.ctx);

1107

}

1108

1109

/* Removes the temp directory used by GPGME */

1110

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

1111

DIR *d;

1112

struct dirent *direntry;

1113

d = opendir(tempdir);

1114

if(d == NULL){

1115

perror("opendir");

1116

} else {

1117

while(true){

1118

direntry = readdir(d);

1119

if(direntry == NULL){

1120

break;

1121

}

1122

if (direntry->d_type == DT_REG){

1123

char *fullname = NULL;

1124

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

1125

direntry->d_name);

1126

if(ret < 0){

1127

perror("asprintf");

1128

continue;

1129

}

1130

ret = unlink(fullname);

1131

if(ret == -1){

1132

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

1133

fullname, strerror(errno));

1134

}

1135

free(fullname);

1136

}

1137

}

1138

closedir(d);

1139

}

1140

ret = rmdir(tempdir);

1141

if(ret == -1){

1142

perror("rmdir");

1143

}

1144

}

1145

1055

1146

return exitcode;

1056

1147

}