/mandos/release : revision 24.1.186

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@recompile.se>.

29

* Contact the authors at <mandos@fukt.bsnet.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

73

*/

74

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

75

getuid(), getgid(), seteuid(),

76

setgid(), pause(), _exit() */

76

setgid(), pause() */

77

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

78

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

79

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

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

WEXITSTATUS(), WTERMSIG() */

90

#include <grp.h> /* setgroups() */

91

88

92

89

#ifdef __linux__

93

90

#include <sys/klog.h> /* klogctl() */

111

108

init_gnutls_session(),

112

109

GNUTLS_* */

113

110

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

116

113

117

114

/* GPGME */

118

115

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

126

123

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

127

124

#define SECKEY "seckey.txt"

128

125

#define PUBKEY "pubkey.txt"

129

#define HOOKDIR "/lib/mandos/network-hooks.d"

130

126

131

127

bool debug = false;

132

128

static const char mandos_protocol_version[] = "1";

133

129

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

134

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

130

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

135

131

static const char sys_class_net[] = "/sys/class/net";

136

132

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

133

139

134

/* Doubly linked list that need to be circularly linked when used */

140

135

typedef struct server{

175

170

perror(print_text);

176

171

}

177

172

178

int fprintf_plus(FILE *stream, const char *format, ...){

179

va_list ap;

180

va_start (ap, format);

181

182

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

183

program_invocation_short_name));

184

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

185

}

186

187

173

/*

188

174

* Make additional room in "buffer" for at least BUFFER_SIZE more

189

175

* bytes. "buffer_capacity" is how much is currently allocated,

190

176

* "buffer_length" is how much is already used.

191

177

*/

192

178

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

179

size_t buffer_capacity){

194

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

181

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

196

182

if(buffer == NULL){

202

188

}

203

189

204

190

/* Add server to set of servers to retry periodically */

205

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

206

int af){

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

207

194

int ret;

208

195

server *new_server = malloc(sizeof(server));

209

196

if(new_server == NULL){

210

197

perror_plus("malloc");

211

return false;

198

return -1;

212

199

}

213

200

*new_server = (server){ .ip = strdup(ip),

214

.port = port,

215

.if_index = if_index,

216

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

217

204

if(new_server->ip == NULL){

218

205

perror_plus("strdup");

219

return false;

206

return -1;

220

207

}

221

208

/* Special case of first server */

222

209

if (mc.current_server == NULL){

233

220

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

234

221

if(ret == -1){

235

222

perror_plus("clock_gettime");

236

return false;

223

return -1;

237

224

}

238

return true;

225

return 0;

239

226

}

240

227

241

228

/*

242

229

* Initialize GPGME.

243

230

*/

244

static bool init_gpgme(const char *seckey, const char *pubkey,

245

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

246

233

gpgme_error_t rc;

247

234

gpgme_engine_info_t engine_info;

248

235

263

250

264

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

252

if(rc != GPG_ERR_NO_ERROR){

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

253

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

254

gpgme_strsource(rc), gpgme_strerror(rc));

268

255

return false;

269

256

}

270

257

271

258

rc = gpgme_op_import(mc.ctx, pgp_data);

272

259

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

275

262

return false;

276

263

}

277

264

284

271

}

285

272

286

273

if(debug){

287

fprintf_plus(stderr, "Initializing GPGME\n");

274

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

288

275

}

289

276

290

277

/* Init GPGME */

291

278

gpgme_check_version(NULL);

292

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

280

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

296

283

return false;

297

284

}

298

285

299

286

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

300

287

rc = gpgme_get_engine_info(&engine_info);

301

288

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

304

291

return false;

305

292

}

306

293

while(engine_info != NULL){

312

299

engine_info = engine_info->next;

313

300

}

314

301

if(engine_info == NULL){

315

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

316

tempdir);

302

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

317

303

return false;

318

304

}

319

305

320

306

/* Create new GPGME "context" */

321

307

rc = gpgme_new(&(mc.ctx));

322

308

if(rc != GPG_ERR_NO_ERROR){

323

fprintf_plus(stderr, "Mandos plugin mandos-client: "

324

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

325

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

326

311

return false;

327

312

}

328

313

347

332

ssize_t plaintext_length = 0;

348

333

349

334

if(debug){

350

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

335

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

351

336

}

352

337

353

338

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

354

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

340

0);

356

341

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

359

344

return -1;

360

345

}

361

346

362

347

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

363

348

rc = gpgme_data_new(&dh_plain);

364

349

if(rc != GPG_ERR_NO_ERROR){

365

fprintf_plus(stderr, "Mandos plugin mandos-client: "

366

"bad gpgme_data_new: %s: %s\n",

367

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

368

352

gpgme_data_release(dh_crypto);

369

353

return -1;

370

354

}

373

357

data buffer */

374

358

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

375

359

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

378

362

plaintext_length = -1;

379

363

if(debug){

380

364

gpgme_decrypt_result_t result;

381

365

result = gpgme_op_decrypt_result(mc.ctx);

382

366

if(result == NULL){

383

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

367

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

384

368

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

389

373

if(result->file_name != NULL){

390

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

374

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

391

375

}

392

376

gpgme_recipient_t recipient;

393

377

recipient = result->recipients;

394

378

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

402

385

recipient = recipient->next;

403

386

}

404

387

}

407

390

}

408

391

409

392

if(debug){

410

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

393

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

411

394

}

412

395

413

396

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

420

403

*plaintext = NULL;

421

404

while(true){

422

405

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

425

408

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

429

412

}

430

413

431

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

444

427

}

445

428

446

429

if(debug){

447

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

430

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

448

431

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

449

432

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

450

433

}

472

455

/* GnuTLS log function callback */

473

456

static void debuggnutls(__attribute__((unused)) int level,

474

457

const char* string){

475

fprintf_plus(stderr, "GnuTLS: %s", string);

458

fprintf(stderr, "GnuTLS: %s", string);

476

459

}

477

460

478

461

static int init_gnutls_global(const char *pubkeyfilename,

480

463

int ret;

481

464

482

465

if(debug){

483

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

466

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

484

467

}

485

468

486

469

ret = gnutls_global_init();

487

470

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

490

473

return -1;

491

474

}

492

475

501

484

/* OpenPGP credentials */

502

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

503

486

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

506

489

gnutls_global_deinit();

507

490

return -1;

508

491

}

509

492

510

493

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

494

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

495

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

496

seckeyfilename);

515

497

}

516

498

517

499

ret = gnutls_certificate_set_openpgp_key_file

518

500

(mc.cred, pubkeyfilename, seckeyfilename,

519

501

GNUTLS_OPENPGP_FMT_BASE64);

520

502

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

526

508

goto globalfail;

527

509

}

528

510

529

511

/* GnuTLS server initialization */

530

512

ret = gnutls_dh_params_init(&mc.dh_params);

531

513

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

514

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

515

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

535

516

goto globalfail;

536

517

}

537

518

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

538

519

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

541

522

goto globalfail;

542

523

}

543

524

563

544

}

564

545

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

565

546

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

569

549

}

570

550

571

551

{

578

558

}

579

559

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

580

560

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

584

564

gnutls_deinit(*session);

585

565

return -1;

586

566

}

595

575

}

596

576

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

597

577

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

600

580

gnutls_deinit(*session);

601

581

return -1;

602

582

}

647

627

pf = PF_INET;

648

628

break;

649

629

default:

650

fprintf_plus(stderr, "Bad address family: %d\n", af);

630

fprintf(stderr, "Bad address family: %d\n", af);

651

631

errno = EINVAL;

652

632

return -1;

653

633

}

658

638

}

659

639

660

640

if(debug){

661

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

662

PRIu16 "\n", ip, port);

641

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

642

"\n", ip, port);

663

643

}

664

644

665

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

691

671

}

692

672

if(ret == 0){

693

673

int e = errno;

694

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

674

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

695

675

errno = e;

696

676

goto mandos_end;

697

677

}

702

682

703

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

684

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

705

-Wunreachable-code*/

685

-Wunreachable-code*/

706

686

if(if_index == AVAHI_IF_UNSPEC){

707

fprintf_plus(stderr, "An IPv6 link-local address is"

708

" incomplete without a network interface\n");

687

fprintf(stderr, "An IPv6 link-local address is incomplete"

688

" without a network interface\n");

709

689

errno = EINVAL;

710

690

goto mandos_end;

711

691

}

729

709

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

730

710

perror_plus("if_indextoname");

731

711

} else {

732

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

733

"\n", ip, interface, port);

712

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

713

ip, interface, port);

734

714

}

735

715

} else {

736

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

737

ip, port);

716

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

717

port);

738

718

}

739

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

730

perror_plus("inet_ntop");

751

731

} else {

752

732

if(strcmp(addrstr, ip) != 0){

753

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

733

fprintf(stderr, "Canonical address form: %s\n", addrstr);

754

734

}

755

735

}

756

736

}

784

764

while(true){

785

765

size_t out_size = strlen(out);

786

766

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

787

out_size - written));

767

out_size - written));

788

768

if(ret == -1){

789

769

int e = errno;

790

770

perror_plus("write");

810

790

}

811

791

812

792

if(debug){

813

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

793

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

814

794

}

815

795

816

796

if(quit_now){

836

816

837

817

if(ret != GNUTLS_E_SUCCESS){

838

818

if(debug){

839

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

819

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

840

820

gnutls_perror(ret);

841

821

}

842

822

errno = EPROTO;

846

826

/* Read OpenPGP packet that contains the wanted password */

847

827

848

828

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

829

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

830

ip);

851

831

}

852

832

853

833

while(true){

858

838

}

859

839

860

840

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

841

buffer_capacity);

862

842

if(buffer_capacity == 0){

863

843

int e = errno;

864

844

perror_plus("incbuffer");

891

871

}

892

872

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

893

873

if(ret < 0){

894

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

895

"***\n");

874

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

896

875

gnutls_perror(ret);

897

876

errno = EPROTO;

898

877

goto mandos_end;

899

878

}

900

879

break;

901

880

default:

902

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

903

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

904

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

884

errno = EIO;

906

885

goto mandos_end;

911

890

}

912

891

913

892

if(debug){

914

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

893

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

915

894

}

916

895

917

896

if(quit_now){

929

908

930

909

if(buffer_length > 0){

931

910

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

933

913

&decrypted_buffer);

934

914

if(decrypted_buffer_size >= 0){

935

915

946

926

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

947

927

int e = errno;

948

928

if(debug){

949

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

950

strerror(errno));

929

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

930

strerror(errno));

951

931

}

952

932

errno = e;

953

933

goto mandos_end;

1010

990

switch(event){

1011

991

default:

1012

992

case AVAHI_RESOLVER_FAILURE:

1013

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1014

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

993

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

994

" of type '%s' in domain '%s': %s\n", name, type, domain,

995

avahi_strerror(avahi_server_errno(mc.server)));

1017

996

break;

1018

997

1019

998

case AVAHI_RESOLVER_FOUND:

1021

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1022

1001

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

1023

1002

if(debug){

1024

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

1025

PRIdMAX ") on port %" PRIu16 "\n", name,

1026

host_name, ip, (intmax_t)interface, port);

1003

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

1004

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

1005

ip, (intmax_t)interface, port);

1027

1006

}

1028

1007

int ret = start_mandos_communication(ip, port, interface,

1029

1008

avahi_proto_to_af(proto));

1030

1009

if(ret == 0){

1031

1010

avahi_simple_poll_quit(mc.simple_poll);

1032

1011

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1036

" list\n", name);

1037

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1038

1014

}

1039

1015

}

1040

1016

}

1064

1040

default:

1065

1041

case AVAHI_BROWSER_FAILURE:

1066

1042

1067

fprintf_plus(stderr, "(Avahi browser) %s\n",

1068

avahi_strerror(avahi_server_errno(mc.server)));

1043

fprintf(stderr, "(Avahi browser) %s\n",

1044

avahi_strerror(avahi_server_errno(mc.server)));

1069

1045

avahi_simple_poll_quit(mc.simple_poll);

1070

1046

return;

1071

1047

1078

1054

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1079

1055

name, type, domain, protocol, 0,

1080

1056

resolve_callback, NULL) == NULL)

1081

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

1057

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1058

name, avahi_strerror(avahi_server_errno(mc.server)));

1084

1059

break;

1085

1060

1086

1061

case AVAHI_BROWSER_REMOVE:

1089

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1090

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1091

1066

if(debug){

1092

fprintf_plus(stderr, "No Mandos server found, still"

1093

" searching...\n");

1067

fprintf(stderr, "No Mandos server found, still searching...\n");

1094

1068

}

1095

1069

break;

1096

1070

}

1111

1085

errno = old_errno;

1112

1086

}

1113

1087

1114

bool get_flags(const char *ifname, struct ifreq *ifr){

1115

int ret;

1116

1117

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1088

/*

1089

* This function determines if a directory entry in /sys/class/net

1090

* corresponds to an acceptable network device.

1091

* (This function is passed to scandir(3) as a filter function.)

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

if(if_entry->d_name[0] == '.'){

1097

return 0;

1098

}

1099

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1116

flagstring[(size_t)to_read] = '\0';

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

tmpmax = strtoimax(flagstring, &tmp, 0);

1141

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1125

1144

if(debug){

1126

perror_plus("ioctl SIOCGIFFLAGS");

1145

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1146

flagstring, if_entry->d_name);

1127

1147

}

1128

return false;

1148

free(flagstring);

1149

return 0;

1129

1150

}

1130

return true;

1131

}

1132

1133

bool good_flags(const char *ifname, const struct ifreq *ifr){

1134

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1135

1153

/* Reject the loopback device */

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1137

1155

if(debug){

1138

fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",

1139

ifname);

1156

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1157

if_entry->d_name);

1140

1158

}

1141

return false;

1159

return 0;

1142

1160

}

1143

1161

/* Accept point-to-point devices only if connect_to is specified */

1144

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1162

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1145

1163

if(debug){

1146

fprintf_plus(stderr, "Accepting point-to-point interface"

1147

" \"%s\"\n", ifname);

1164

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1165

if_entry->d_name);

1148

1166

}

1149

return true;

1167

return 1;

1150

1168

}

1151

1169

/* Otherwise, reject non-broadcast-capable devices */

1152

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1170

if(not (flags & IFF_BROADCAST)){

1153

1171

if(debug){

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

" \"%s\"\n", ifname);

1172

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1173

if_entry->d_name);

1156

1174

}

1157

return false;

1175

return 0;

1158

1176

}

1159

1177

/* Reject non-ARP interfaces (including dummy interfaces) */

1160

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1161

1179

if(debug){

1162

fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",

1163

ifname);

1180

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1181

if_entry->d_name);

1164

1182

}

1165

return false;

1183

return 0;

1166

1184

}

1167

1168

1185

/* Accept this device */

1169

1186

if(debug){

1170

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

* This function determines if a directory entry in /sys/class/net

1177

* corresponds to an acceptable network device.

1178

* (This function is passed to scandir(3) as a filter function.)

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

if(if_entry->d_name[0] == '.'){

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

if(not get_flags(if_entry->d_name, &ifr)){

1187

if(debug){

1188

fprintf_plus(stderr, "Failed to get flags for interface "

1189

"\"%s\"\n", if_entry->d_name);

1190

}

1191

return 0;

1192

}

1193

1194

if(not good_flags(if_entry->d_name, &ifr)){

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

* This function determines if a directory entry in /sys/class/net

1202

* corresponds to an acceptable network device which is up.

1203

* (This function is passed to scandir(3) as a filter function.)

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

if(if_entry->d_name[0] == '.'){

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

if(not get_flags(if_entry->d_name, &ifr)){

1212

if(debug){

1213

fprintf_plus(stderr, "Failed to get flags for interface "

1214

"\"%s\"\n", if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

if(not (ifr.ifr_flags & IFF_UP)){

1221

if(debug){

1222

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

if(not (ifr.ifr_flags & IFF_RUNNING)){

1230

if(debug){

1231

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

if(not good_flags(if_entry->d_name, &ifr)){

1238

return 0;

1187

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1188

if_entry->d_name);

1239

1189

}

1240

1190

return 1;

1241

1191

}

1251

1201

return 1;

1252

1202

}

1253

1203

1254

/* Is this directory entry a runnable program? */

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

if((direntry->d_name)[0] == '\0'){

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

if((direntry->d_name)[sret] != '\0'){

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

if(not (S_ISREG(st.st_mode))){

1293

/* Not a regular file */

1294

if(debug){

1295

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1301

/* Not executable */

1302

if(debug){

1303

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1315

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1316

1205

int ret;

1317

1206

struct timespec now;

1321

1210

while(true){

1322

1211

if(mc.current_server == NULL){

1323

1212

if (debug){

1324

fprintf_plus(stderr, "Wait until first server is found."

1325

" No timeout!\n");

1213

fprintf(stderr,

1214

"Wait until first server is found. No timeout!\n");

1326

1215

}

1327

1216

ret = avahi_simple_poll_iterate(s, -1);

1328

1217

} else {

1329

1218

if (debug){

1330

fprintf_plus(stderr, "Check current_server if we should run"

1331

" it, or wait\n");

1219

fprintf(stderr, "Check current_server if we should run it,"

1220

" or wait\n");

1332

1221

}

1333

1222

/* the current time */

1334

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1350

1239

- ((intmax_t)waited_time.tv_nsec / 1000000));

1351

1240

1352

1241

if (debug){

1353

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1354

block_time);

1242

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1355

1243

}

1356

1244

1357

1245

if(block_time <= 0){

1377

1265

ret = avahi_simple_poll_iterate(s, (int)block_time);

1378

1266

}

1379

1267

if(ret != 0){

1380

if (ret > 0 or errno != EINTR){

1268

if (ret > 0 or errno != EINTR) {

1381

1269

return (ret != 1) ? ret : 0;

1382

1270

}

1383

1271

}

1384

1272

}

1385

1273

}

1386

1274

1387

bool run_network_hooks(const char *mode, const char *interface,

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

int devnull = open("/dev/null", O_RDONLY);

1398

for(int i = 0; i < numhooks; i++){

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

ret = setenv("DEVICE", interface, 1);

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

ret = setenv("VERBOSE", debug ? "1" : "0", 1);

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

ret = setenv("MODE", mode, 1);

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

ret = asprintf(&delaystring, "%f", delay);

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

ret = setenv("DELAY", delaystring, 1);

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

ret = execl(fullname, direntry->d_name, mode, NULL);

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1485

" with status %d\n", direntry->d_name,

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1492

" signal %d\n", direntry->d_name,

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

fprintf_plus(stderr, "Warning: network hook \"%s\""

1498

" crashed\n", direntry->d_name);

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1512

}

1513

1514

1275

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

1515

1276

AvahiSServiceBrowser *sb = NULL;

1516

1277

int error;

1598

1359

.arg = "SECONDS",

1599

1360

.doc = "Retry interval used when denied by the mandos server",

1600

1361

.group = 2 },

1601

{ .name = "network-hook-dir", .key = 133,

1602

.arg = "DIR",

1603

.doc = "Directory where network hooks are located",

1604

.group = 2 },

1605

1362

/*

1606

1363

* These reproduce what we would get without ARGP_NO_HELP

1607

1364

*/

1660

1417

argp_error(state, "Bad retry interval");

1661

1418

}

1662

1419

break;

1663

case 133: /* --network-hook-dir */

1664

hookdir = arg;

1665

break;

1666

1420

/*

1667

1421

* These reproduce what we would get without ARGP_NO_HELP

1668

1422

*/

1674

1428

argp_state_help(state, state->out_stream,

1675

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1676

1430

case 'V': /* --version */

1677

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1431

fprintf(state->out_stream, "%s\n", argp_program_version);

1678

1432

exit(argp_err_exit_status);

1679

1433

break;

1680

1434

default:

1707

1461

{

1708

1462

/* Work around Debian bug #633582:

1709

1463

<http://bugs.debian.org/633582> */

1464

struct stat st;

1710

1465

1711

1466

/* Re-raise priviliges */

1712

1467

errno = 0;

1713

1468

ret = seteuid(0);

1714

1469

if(ret == -1){

1715

1470

perror_plus("seteuid");

1716

} else {

1717

struct stat st;

1718

1719

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

and st.st_uid == 0 and st.st_gid == 0){

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode)

1750

and st.st_uid == 0 and st.st_gid == 0){

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

if(not run_network_hooks("start", interface, delay)){

1772

goto end;

1471

}

1472

1473

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

1773

1519

}

1774

1520

1775

1521

if(not debug){

1776

1522

avahi_set_log_function(empty_log);

1777

1523

}

1778

1524

1779

1525

if(interface[0] == '\0'){

1780

1526

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1783

1528

alphasort);

1784

if(ret == 0){

1785

/* No up interfaces, look for any good interfaces */

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

1529

if(ret >= 1){

1791

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1792

1531

interface = strdup(direntries[0]->d_name);

1793

1532

if(debug){

1794

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1533

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

1795

1534

}

1796

1535

if(interface == NULL){

1797

1536

perror_plus("malloc");

1802

1541

free(direntries);

1803

1542

} else {

1804

1543

free(direntries);

1805

fprintf_plus(stderr, "Could not find a network interface\n");

1544

fprintf(stderr, "Could not find a network interface\n");

1806

1545

exitcode = EXIT_FAILURE;

1807

1546

goto end;

1808

1547

}

1814

1553

srand((unsigned int) time(NULL));

1815

1554

mc.simple_poll = avahi_simple_poll_new();

1816

1555

if(mc.simple_poll == NULL){

1817

fprintf_plus(stderr,

1818

"Avahi: Failed to create simple poll object.\n");

1556

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1819

1557

exitcode = EX_UNAVAILABLE;

1820

1558

goto end;

1821

1559

}

1887

1625

if(strcmp(interface, "none") != 0){

1888

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

1627

if(if_index == 0){

1890

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

1628

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

1891

1629

exitcode = EX_UNAVAILABLE;

1892

1630

goto end;

1893

1631

}

2013

1751

#endif /* __linux__ */

2014

1752

/* Lower privileges */

2015

1753

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

2020

1766

}

2021

1767

}

2022

1768

2026

1772

2027

1773

ret = init_gnutls_global(pubkey, seckey);

2028

1774

if(ret == -1){

2029

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

1775

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

2030

1776

exitcode = EX_UNAVAILABLE;

2031

1777

goto end;

2032

1778

} else {

2048

1794

}

2049

1795

2050

1796

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

2051

fprintf_plus(stderr, "init_gpgme failed\n");

1797

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

2052

1798

exitcode = EX_UNAVAILABLE;

2053

1799

goto end;

2054

1800

} else {

2064

1810

/* (Mainly meant for debugging) */

2065

1811

char *address = strrchr(connect_to, ':');

2066

1812

if(address == NULL){

2067

fprintf_plus(stderr, "No colon in address\n");

1813

fprintf(stderr, "No colon in address\n");

2068

1814

exitcode = EX_USAGE;

2069

1815

goto end;

2070

1816

}

2078

1824

tmpmax = strtoimax(address+1, &tmp, 10);

2079

1825

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2080

1826

or tmpmax != (uint16_t)tmpmax){

2081

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

1827

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

2082

1828

exitcode = EX_USAGE;

2083

1829

goto end;

2084

1830

}

2114

1860

break;

2115

1861

}

2116

1862

if(debug){

2117

fprintf_plus(stderr, "Retrying in %d seconds\n",

2118

(int)retry_interval);

1863

fprintf(stderr, "Retrying in %d seconds\n",

1864

(int)retry_interval);

2119

1865

}

2120

1866

sleep((int)retry_interval);

2121

1867

}

2123

1869

if (not quit_now){

2124

1870

exitcode = EXIT_SUCCESS;

2125

1871

}

2126

1872

2127

1873

goto end;

2128

1874

}

2129

1875

2151

1897

2152

1898

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

2153

1899

if(mc.server == NULL){

2154

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

2155

avahi_strerror(error));

1900

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

1901

avahi_strerror(error));

2156

1902

exitcode = EX_UNAVAILABLE;

2157

1903

goto end;

2158

1904

}

2166

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2167

1913

NULL, 0, browse_callback, NULL);

2168

1914

if(sb == NULL){

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2171

1917

exitcode = EX_UNAVAILABLE;

2172

1918

goto end;

2173

1919

}

2179

1925

/* Run the main loop */

2180

1926

2181

1927

if(debug){

2182

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

1928

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

2183

1929

}

2184

1930

2185

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

1932

(int)(retry_interval * 1000));

2187

1933

if(debug){

2188

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2189

(ret == 0) ? "successfully" : "with error");

1934

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1935

(ret == 0) ? "successfully" : "with error");

2190

1936

}

2191

1937

2192

1938

end:

2193

1939

2194

1940

if(debug){

2195

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

1941

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

2196

1942

}

2197

1943

2198

1944

/* Cleanup things */

2214

1960

if(gpgme_initialized){

2215

1961

gpgme_release(mc.ctx);

2216

1962

}

2217

1963

2218

1964

/* Cleans up the circular linked list of Mandos servers the client

2219

1965

has seen */

2220

1966

if(mc.current_server != NULL){

2226

1972

}

2227

1973

}

2228

1974

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

2234

1978

errno = 0;

2235

1979

ret = seteuid(0);

2236

1980

if(ret == -1){

2237

1981

perror_plus("seteuid");

2238

1982

}

2239

2240

/* Take down the network interface */

2241

if(take_down_interface and geteuid() == 0){

1983

if(geteuid() == 0){

2242

1984

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

2243

1985

if(ret == -1){

2244

1986

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2246

1988

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2247

1989

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

2248

1990

if(ret == -1){

2253

1995

if(ret == -1){

2254

1996

perror_plus("close");

2255

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2256

2004

}

2257

2005

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

2264

2006

2265

2007

/* Removes the GPGME temp directory and all files inside */

2266

2008

if(tempdir_created){

2280

2022

}

2281

2023

ret = remove(fullname);

2282

2024

if(ret == -1){

2283

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2284

strerror(errno));

2025

fprintf(stderr, "remove(\"%s\"): %s\n", fullname,

2026

strerror(errno));

2285

2027

}

2286

2028

free(fullname);

2287

2029

}