/mandos/trunk : revision 266

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos client - get and decrypt data from a Mandos server

3

* Mandos-client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

14

*

14

15

* This program is free software: you can redistribute it and/or

15

16

* modify it under the terms of the GNU General Public License as

35

36

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

36

37

38

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

38

stdout, ferror() */

39

stdout, ferror(), sscanf */

39

40

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

40

41

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

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

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48

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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

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uid_t, gid_t, open(), opendir(),

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DIR */

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53

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

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

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struct in6_addr, inet_pton(),

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connect() */

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

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

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

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

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*/

60

#include <inttypes.h> /* PRIu16, SCNu16 */

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61

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

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62

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

60

63

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

66

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

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setgid() */

68

71

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

69

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

72

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

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73

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

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argp_state, struct argp,

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75

argp_parse(), ARGP_KEY_ARG,

89

92

gnutls_*

90

93

init_gnutls_session(),

91

94

GNUTLS_* */

92

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

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#include <gnutls/openpgp.h>

96

/* gnutls_certificate_set_openpgp_key_file(),

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97

GNUTLS_OPENPGP_FMT_BASE64 */

94

98

95

99

/* GPGME */

101

105

102

106

#define BUFFER_SIZE 256

103

107

104

/*

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

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*/

107

108

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

109

#define SECKEY "seckey.txt"

110

#define PUBKEY "pupkey.txt"

110

#define PUBKEY "pubkey.txt"

111

112

bool debug = false;

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static const char mandos_protocol_version[] = "1";

114

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

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

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

116

117

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

132

*/

133

size_t adjustbuffer(char **buffer, size_t buffer_length,

134

size_t buffer_capacity){

135

if (buffer_length + BUFFER_SIZE > buffer_capacity){

135

if(buffer_length + BUFFER_SIZE > buffer_capacity){

136

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

137

if (buffer == NULL){

137

if(buffer == NULL){

138

return 0;

139

}

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buffer_capacity += BUFFER_SIZE;

150

int ret;

151

gpgme_error_t rc;

152

gpgme_engine_info_t engine_info;

153

154

155

/*

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

159

int fd;

160

gpgme_data_t pgp_data;

161

162

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

162

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

163

if(fd == -1){

164

perror("open");

165

return false;

166

}

167

168

rc = gpgme_data_new_from_fd(&pgp_data, fd);

169

if (rc != GPG_ERR_NO_ERROR){

169

if(rc != GPG_ERR_NO_ERROR){

170

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

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gpgme_strsource(rc), gpgme_strerror(rc));

172

return false;

173

}

174

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

176

if (rc != GPG_ERR_NO_ERROR){

176

if(rc != GPG_ERR_NO_ERROR){

177

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

178

gpgme_strsource(rc), gpgme_strerror(rc));

179

return false;

180

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

181

182

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

183

if(ret == -1){

184

perror("close");

185

}

187

return true;

188

}

189

190

if (debug){

190

if(debug){

191

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

192

}

193

194

/* Init GPGME */

195

gpgme_check_version(NULL);

196

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

197

if (rc != GPG_ERR_NO_ERROR){

197

if(rc != GPG_ERR_NO_ERROR){

198

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

199

gpgme_strsource(rc), gpgme_strerror(rc));

200

return false;

201

}

202

203

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

204

rc = gpgme_get_engine_info (&engine_info);

205

if (rc != GPG_ERR_NO_ERROR){

204

rc = gpgme_get_engine_info(&engine_info);

205

if(rc != GPG_ERR_NO_ERROR){

206

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

207

gpgme_strsource(rc), gpgme_strerror(rc));

208

return false;

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){

225

if(rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

228

return false;

229

}

230

231

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

231

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

232

return false;

233

}

234

239

* Decrypt OpenPGP data.

240

* Returns -1 on error

241

*/

242

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

242

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

246

gpgme_data_t dh_crypto, dh_plain;

247

gpgme_error_t rc;

248

ssize_t ret;

249

size_t plaintext_capacity = 0;

250

ssize_t plaintext_length = 0;

251

252

if (debug){

252

if(debug){

253

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

254

}

255

256

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

257

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

258

0);

259

if (rc != GPG_ERR_NO_ERROR){

259

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

262

return -1;

264

265

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

266

rc = gpgme_data_new(&dh_plain);

267

if (rc != GPG_ERR_NO_ERROR){

267

if(rc != GPG_ERR_NO_ERROR){

268

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

269

gpgme_strsource(rc), gpgme_strerror(rc));

270

gpgme_data_release(dh_crypto);

274

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

275

data buffer */

276

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

277

if (rc != GPG_ERR_NO_ERROR){

277

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

280

plaintext_length = -1;

281

if (debug){

281

if(debug){

282

gpgme_decrypt_result_t result;

283

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

284

if(result == NULL){

285

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

286

} else {

287

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

314

}

315

316

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

317

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

318

perror("pgpme_data_seek");

317

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

318

perror("gpgme_data_seek");

319

plaintext_length = -1;

320

goto decrypt_end;

321

}

325

plaintext_capacity = adjustbuffer(plaintext,

326

(size_t)plaintext_length,

327

plaintext_capacity);

328

if (plaintext_capacity == 0){

328

if(plaintext_capacity == 0){

329

perror("adjustbuffer");

330

plaintext_length = -1;

331

goto decrypt_end;

334

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

335

BUFFER_SIZE);

336

/* Print the data, if any */

337

if (ret == 0){

337

if(ret == 0){

338

/* EOF */

339

break;

340

}

364

return plaintext_length;

365

}

366

367

static const char * safer_gnutls_strerror (int value) {

368

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

369

if (ret == NULL)

367

static const char * safer_gnutls_strerror(int value) {

368

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

369

if(ret == NULL)

370

ret = "(unknown)";

371

return ret;

372

}

387

}

388

389

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

390

if(ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

393

return -1;

394

}

395

396

if (debug){

396

if(debug){

397

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

398

* - GnuTLS manual

399

*/

403

404

/* OpenPGP credentials */

405

gnutls_certificate_allocate_credentials(&mc->cred);

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

406

if(ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit();

411

return -1;

412

}

413

420

ret = gnutls_certificate_set_openpgp_key_file

421

(mc->cred, pubkeyfilename, seckeyfilename,

422

GNUTLS_OPENPGP_FMT_BASE64);

423

if (ret != GNUTLS_E_SUCCESS) {

423

if(ret != GNUTLS_E_SUCCESS) {

424

fprintf(stderr,

425

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

426

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

431

432

/* GnuTLS server initialization */

433

ret = gnutls_dh_params_init(&mc->dh_params);

434

if (ret != GNUTLS_E_SUCCESS) {

435

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

436

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

434

if(ret != GNUTLS_E_SUCCESS) {

435

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

436

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

437

goto globalfail;

438

}

439

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

440

if (ret != GNUTLS_E_SUCCESS) {

441

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

442

safer_gnutls_strerror(ret));

440

if(ret != GNUTLS_E_SUCCESS) {

441

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

442

safer_gnutls_strerror(ret));

443

goto globalfail;

444

}

445

451

452

gnutls_certificate_free_credentials(mc->cred);

453

gnutls_global_deinit();

454

gnutls_dh_params_deinit(mc->dh_params);

454

455

return -1;

455

456

}

456

457

459

460

int ret;

460

461

/* GnuTLS session creation */

461

462

ret = gnutls_init(session, GNUTLS_SERVER);

462

if (ret != GNUTLS_E_SUCCESS){

463

if(ret != GNUTLS_E_SUCCESS){

463

464

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

464

465

safer_gnutls_strerror(ret));

465

466

}

467

468

{

468

469

const char *err;

469

470

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

470

if (ret != GNUTLS_E_SUCCESS) {

471

if(ret != GNUTLS_E_SUCCESS) {

471

472

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

472

473

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

473

474

safer_gnutls_strerror(ret));

474

gnutls_deinit (*session);

475

gnutls_deinit(*session);

475

476

return -1;

476

477

}

477

478

}

478

479

480

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

480

481

mc->cred);

481

if (ret != GNUTLS_E_SUCCESS) {

482

if(ret != GNUTLS_E_SUCCESS) {

482

483

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

483

484

safer_gnutls_strerror(ret));

484

gnutls_deinit (*session);

485

gnutls_deinit(*session);

485

486

return -1;

486

487

}

487

488

489

/* ignore client certificate if any. */

489

gnutls_certificate_server_set_request (*session,

490

GNUTLS_CERT_IGNORE);

490

gnutls_certificate_server_set_request(*session,

491

GNUTLS_CERT_IGNORE);

491

492

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

493

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

493

494

495

return 0;

495

496

}

503

504

AvahiIfIndex if_index,

504

505

mandos_context *mc){

505

506

int ret, tcp_sd;

507

ssize_t sret;

506

508

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

507

509

char *buffer = NULL;

508

510

char *decrypted_buffer;

514

516

char interface[IF_NAMESIZE];

515

517

gnutls_session_t session;

516

518

517

ret = init_gnutls_session (mc, &session);

518

if (ret != 0){

519

ret = init_gnutls_session(mc, &session);

520

if(ret != 0){

519

521

return -1;

520

522

}

521

523

543

545

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

544

546

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

545

547

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

546

if (ret < 0 ){

548

if(ret < 0 ){

547

549

perror("inet_pton");

548

550

return -1;

549

551

}

570

572

}

571

573

572

574

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

573

if (ret < 0){

575

if(ret < 0){

574

576

perror("connect");

575

577

return -1;

576

578

}

577

579

578

580

const char *out = mandos_protocol_version;

579

581

written = 0;

580

while (true){

582

while(true){

581

583

size_t out_size = strlen(out);

582

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

584

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

583

585

out_size - written));

584

if (ret == -1){

586

if(ret == -1){

585

587

perror("write");

586

588

retval = -1;

587

589

goto mandos_end;

590

592

if(written < out_size){

591

593

continue;

592

594

} else {

593

if (out == mandos_protocol_version){

595

if(out == mandos_protocol_version){

594

596

written = 0;

595

597

out = "\r\n";

596

598

} else {

603

605

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

604

606

}

605

607

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

608

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

607

609

608

610

do{

609

ret = gnutls_handshake (session);

611

ret = gnutls_handshake(session);

610

612

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

611

613

612

if (ret != GNUTLS_E_SUCCESS){

614

if(ret != GNUTLS_E_SUCCESS){

613

615

if(debug){

614

616

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

615

gnutls_perror (ret);

617

gnutls_perror(ret);

616

618

}

617

619

retval = -1;

618

620

goto mandos_end;

628

630

while(true){

629

631

buffer_capacity = adjustbuffer(&buffer, buffer_length,

630

632

buffer_capacity);

631

if (buffer_capacity == 0){

633

if(buffer_capacity == 0){

632

634

perror("adjustbuffer");

633

635

retval = -1;

634

636

goto mandos_end;

635

637

}

636

638

637

ret = gnutls_record_recv(session, buffer+buffer_length,

638

BUFFER_SIZE);

639

if (ret == 0){

639

sret = gnutls_record_recv(session, buffer+buffer_length,

640

BUFFER_SIZE);

641

if(sret == 0){

640

642

break;

641

643

}

642

if (ret < 0){

643

switch(ret){

644

if(sret < 0){

645

switch(sret){

644

646

case GNUTLS_E_INTERRUPTED:

645

647

case GNUTLS_E_AGAIN:

646

648

break;

647

649

case GNUTLS_E_REHANDSHAKE:

648

650

do{

649

ret = gnutls_handshake (session);

651

ret = gnutls_handshake(session);

650

652

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

651

if (ret < 0){

653

if(ret < 0){

652

654

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

653

gnutls_perror (ret);

655

gnutls_perror(ret);

654

656

retval = -1;

655

657

goto mandos_end;

656

658

}

659

661

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

660

662

" encrypted session with Mandos server\n");

661

663

retval = -1;

662

gnutls_bye (session, GNUTLS_SHUT_RDWR);

664

gnutls_bye(session, GNUTLS_SHUT_RDWR);

663

665

goto mandos_end;

664

666

}

665

667

} else {

666

buffer_length += (size_t) ret;

668

buffer_length += (size_t) sret;

667

669

}

668

670

}

669

671

673

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

672

674

}

673

675

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

676

gnutls_bye(session, GNUTLS_SHUT_RDWR);

675

677

676

if (buffer_length > 0){

678

if(buffer_length > 0){

677

679

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

678

680

buffer_length,

679

681

&decrypted_buffer);

680

if (decrypted_buffer_size >= 0){

682

if(decrypted_buffer_size >= 0){

681

683

written = 0;

682

684

while(written < (size_t) decrypted_buffer_size){

683

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

684

(size_t)decrypted_buffer_size - written,

685

stdout);

685

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

686

(size_t)decrypted_buffer_size - written,

687

stdout);

686

688

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

687

689

if(debug){

688

690

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

705

707

706

708

mandos_end:

707

709

free(buffer);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

710

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

709

711

if(ret == -1){

710

712

perror("close");

711

713

}

712

gnutls_deinit (session);

714

gnutls_deinit(session);

713

715

return retval;

714

716

}

715

717

733

735

/* Called whenever a service has been resolved successfully or

734

736

timed out */

735

737

736

switch (event) {

738

switch(event) {

737

739

default:

738

740

case AVAHI_RESOLVER_FAILURE:

739

741

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

751

753

interface, port);

752

754

}

753

755

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

754

if (ret == 0){

756

if(ret == 0){

755

757

avahi_simple_poll_quit(mc->simple_poll);

756

758

}

757

759

}

775

777

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

776

778

is removed from the LAN */

777

779

778

switch (event) {

780

switch(event) {

779

781

default:

780

782

case AVAHI_BROWSER_FAILURE:

781

783

790

792

the callback function is called the Avahi server will free the

791

793

resolver for us. */

792

794

793

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

795

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

794

796

protocol, name, type, domain,

795

797

AVAHI_PROTO_INET6, 0,

796

798

resolve_callback, mc)))

830

832

.dh_bits = 1024, .priority = "SECURE256"

831

833

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

832

834

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

835

bool gpgme_initalized = false;

834

836

835

837

{

836

838

struct argp_option options[] = {

865

867

{ .name = NULL }

866

868

};

867

869

868

error_t parse_opt (int key, char *arg,

869

struct argp_state *state) {

870

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

871

a pointer to our plugin list pointer. */

872

switch (key) {

870

error_t parse_opt(int key, char *arg,

871

struct argp_state *state) {

872

switch(key) {

873

case 128: /* --debug */

874

debug = true;

875

break;

886

pubkey = arg;

887

break;

888

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

889

errno = 0;

890

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

891

if (errno){

892

perror("strtol");

889

ret = sscanf(arg, "%u", &mc.dh_bits);

890

if(ret != 1){

891

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

893

892

exit(EXIT_FAILURE);

894

893

}

895

894

break;

897

896

mc.priority = arg;

898

897

break;

899

898

case ARGP_KEY_ARG:

900

argp_usage (state);

899

argp_usage(state);

901

900

case ARGP_KEY_END:

902

901

break;

903

902

default:

910

909

.args_doc = "",

911

910

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

912

911

" passwords from a Mandos server" };

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

912

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

913

if(ret == ARGP_ERR_UNKNOWN){

915

914

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

916

915

exitcode = EXIT_FAILURE;

917

916

goto end;

918

917

}

919

918

}

920

919

921

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

922

if (ret == -1){

923

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

924

exitcode = EXIT_FAILURE;

925

goto end;

926

} else {

927

gnutls_initalized = true;

928

}

929

930

if(mkdtemp(tempdir) == NULL){

931

perror("mkdtemp");

932

tempdir[0] = '\0';

933

goto end;

934

}

935

936

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

937

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

938

exitcode = EXIT_FAILURE;

939

goto end;

940

} else {

941

pgpme_initalized = true;

942

}

943

944

920

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

945

921

{

946

922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

965

941

goto end;

966

942

}

967

943

}

968

ret = TEMP_FAILURE_RETRY(close(sd));

944

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

969

945

if(ret == -1){

970

946

perror("close");

971

947

}

975

951

gid = getgid();

976

952

977

953

ret = setuid(uid);

978

if (ret == -1){

954

if(ret == -1){

979

955

perror("setuid");

980

956

}

981

957

982

958

setgid(gid);

983

if (ret == -1){

959

if(ret == -1){

984

960

perror("setgid");

985

961

}

986

962

963

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

964

if(ret == -1){

965

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

966

exitcode = EXIT_FAILURE;

967

goto end;

968

} else {

969

gnutls_initalized = true;

970

}

971

972

if(mkdtemp(tempdir) == NULL){

973

perror("mkdtemp");

974

tempdir[0] = '\0';

975

goto end;

976

}

977

978

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

979

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

980

exitcode = EXIT_FAILURE;

981

goto end;

982

} else {

983

gpgme_initalized = true;

984

}

985

987

986

if_index = (AvahiIfIndex) if_nametoindex(interface);

988

987

if(if_index == 0){

989

988

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

999

998

exitcode = EXIT_FAILURE;

1000

999

goto end;

1001

1000

}

1002

errno = 0;

1003

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

1004

if(errno){

1005

perror("Bad port number");

1001

uint16_t port;

1002

ret = sscanf(address+1, "%" SCNu16, &port);

1003

if(ret != 1){

1004

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

1006

1005

exitcode = EXIT_FAILURE;

1007

1006

goto end;

1008

1007

}

1017

1016

goto end;

1018

1017

}

1019

1018

1020

if (not debug){

1019

if(not debug){

1021

1020

avahi_set_log_function(empty_log);

1022

1021

}

1023

1022

1026

1025

1027

1026

/* Allocate main Avahi loop object */

1028

1027

mc.simple_poll = avahi_simple_poll_new();

1029

if (mc.simple_poll == NULL) {

1028

if(mc.simple_poll == NULL) {

1030

1029

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

1031

1030

" object.\n");

1032

1031

exitcode = EXIT_FAILURE;

1052

1051

}

1053

1052

1054

1053

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

1055

if (mc.server == NULL) {

1054

if(mc.server == NULL) {

1056

1055

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

1057

1056

avahi_strerror(error));

1058

1057

exitcode = EXIT_FAILURE;

1064

1063

AVAHI_PROTO_INET6,

1065

1064

"_mandos._tcp", NULL, 0,

1066

1065

browse_callback, &mc);

1067

if (sb == NULL) {

1066

if(sb == NULL) {

1068

1067

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

1069

1068

avahi_strerror(avahi_server_errno(mc.server)));

1070

1069

exitcode = EXIT_FAILURE;

1073

1072

1074

1073

/* Run the main loop */

1075

1074

1076

if (debug){

1075

if(debug){

1077

1076

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

1078

1077

}

1079

1078

1081

1080

1082

1081

end:

1083

1082

1084

if (debug){

1083

if(debug){

1085

1084

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

1086

1085

}

1087

1086

1088

1087

/* Cleanup things */

1089

if (sb != NULL)

1088

if(sb != NULL)

1090

1089

avahi_s_service_browser_free(sb);

1091

1090

1092

if (mc.server != NULL)

1091

if(mc.server != NULL)

1093

1092

avahi_server_free(mc.server);

1094

1093

1095

if (mc.simple_poll != NULL)

1094

if(mc.simple_poll != NULL)

1096

1095

avahi_simple_poll_free(mc.simple_poll);

1097

1096

1098

if (gnutls_initalized){

1097

if(gnutls_initalized){

1099

1098

gnutls_certificate_free_credentials(mc.cred);

1100

gnutls_global_deinit ();

1099

gnutls_global_deinit();

1100

gnutls_dh_params_deinit(mc.dh_params);

1101

}

1102

1103

if(pgpme_initalized){

1102

1103

if(gpgme_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");

1113

if(errno != ENOENT){

1114

perror("opendir");

1115

}

1114

1116

} else {

1115

1117

while(true){

1116

1118

direntry = readdir(d);

1117

1119

if(direntry == NULL){

1118

1120

break;

1119

1121

}

1120

if (direntry->d_type == DT_REG){

1122

if(direntry->d_type == DT_REG){

1121

1123

char *fullname = NULL;

1122

1124

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

1123

1125

direntry->d_name);

1133

1135

free(fullname);

1134

1136

}

1135

1137

}

1138

closedir(d);

1136

1139

}

1137

1140

ret = rmdir(tempdir);

1138

if(ret == -1){

1141

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

1139

1142

perror("rmdir");

1140

1143

}

1141

1144

}