/mandos/trunk : revision 237.4.16

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() */

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

88

91

89

#ifdef __linux__

92

90

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

110

108

init_gnutls_session(),

111

109

GNUTLS_* */

112

110

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

115

113

116

114

/* GPGME */

117

115

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

125

123

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

126

124

#define SECKEY "seckey.txt"

127

125

#define PUBKEY "pubkey.txt"

128

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

129

126

130

127

bool debug = false;

131

128

static const char mandos_protocol_version[] = "1";

132

129

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

133

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

130

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

134

131

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

135

132

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

133

138

134

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

139

135

typedef struct server{

174

170

perror(print_text);

175

171

}

176

172

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

186

173

/*

187

174

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

188

175

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

189

176

* "buffer_length" is how much is already used.

190

177

*/

191

178

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

179

size_t buffer_capacity){

193

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

181

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

195

182

if(buffer == NULL){

200

187

return buffer_capacity;

201

188

}

202

189

203

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

204

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

205

int af){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

206

193

int ret;

207

194

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

208

195

if(new_server == NULL){

210

197

return -1;

211

198

}

212

199

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

216

203

if(new_server->ip == NULL){

217

204

perror_plus("strdup");

218

205

return -1;

219

206

}

220

/* Special case of first server */

207

/* unique case of first server */

221

208

if (mc.current_server == NULL){

222

209

new_server->next = new_server;

223

210

new_server->prev = new_server;

224

211

mc.current_server = new_server;

225

/* Place the new server last in the list */

212

/* Placing the new server last in the list */

226

213

} else {

227

214

new_server->next = mc.current_server;

228

215

new_server->prev = mc.current_server->prev;

240

227

/*

241

228

* Initialize GPGME.

242

229

*/

243

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

244

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

245

232

gpgme_error_t rc;

246

233

gpgme_engine_info_t engine_info;

247

234

262

249

263

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

251

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

267

254

return false;

268

255

}

269

256

270

257

rc = gpgme_op_import(mc.ctx, pgp_data);

271

258

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

274

261

return false;

275

262

}

276

263

283

270

}

284

271

285

272

if(debug){

286

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

273

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

287

274

}

288

275

289

276

/* Init GPGME */

290

277

gpgme_check_version(NULL);

291

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

279

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

295

282

return false;

296

283

}

297

284

298

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

285

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

299

286

rc = gpgme_get_engine_info(&engine_info);

300

287

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

303

290

return false;

304

291

}

305

292

while(engine_info != NULL){

311

298

engine_info = engine_info->next;

312

299

}

313

300

if(engine_info == NULL){

314

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

315

tempdir);

301

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

316

302

return false;

317

303

}

318

304

319

305

/* Create new GPGME "context" */

320

306

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

321

307

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

325

310

return false;

326

311

}

327

312

346

331

ssize_t plaintext_length = 0;

347

332

348

333

if(debug){

349

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

334

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

350

335

}

351

336

352

337

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

353

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

339

0);

355

340

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

358

343

return -1;

359

344

}

360

345

361

346

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

362

347

rc = gpgme_data_new(&dh_plain);

363

348

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

367

351

gpgme_data_release(dh_crypto);

368

352

return -1;

369

353

}

372

356

data buffer */

373

357

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

374

358

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

377

361

plaintext_length = -1;

378

362

if(debug){

379

363

gpgme_decrypt_result_t result;

380

364

result = gpgme_op_decrypt_result(mc.ctx);

381

365

if(result == NULL){

382

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

366

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

383

367

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

388

372

if(result->file_name != NULL){

389

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

373

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

390

374

}

391

375

gpgme_recipient_t recipient;

392

376

recipient = result->recipients;

393

377

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

401

384

recipient = recipient->next;

402

385

}

403

386

}

406

389

}

407

390

408

391

if(debug){

409

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

392

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

410

393

}

411

394

412

395

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

419

402

*plaintext = NULL;

420

403

while(true){

421

404

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

424

407

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

428

411

}

429

412

430

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

443

426

}

444

427

445

428

if(debug){

446

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

429

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

447

430

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

448

431

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

449

432

}

471

454

/* GnuTLS log function callback */

472

455

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

473

456

const char* string){

474

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

457

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

475

458

}

476

459

477

460

static int init_gnutls_global(const char *pubkeyfilename,

479

462

int ret;

480

463

481

464

if(debug){

482

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

465

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

483

466

}

484

467

485

468

ret = gnutls_global_init();

486

469

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

489

472

return -1;

490

473

}

491

474

500

483

/* OpenPGP credentials */

501

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

502

485

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

505

488

gnutls_global_deinit();

506

489

return -1;

507

490

}

508

491

509

492

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

493

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

494

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

495

seckeyfilename);

514

496

}

515

497

516

498

ret = gnutls_certificate_set_openpgp_key_file

517

499

(mc.cred, pubkeyfilename, seckeyfilename,

518

500

GNUTLS_OPENPGP_FMT_BASE64);

519

501

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

525

507

goto globalfail;

526

508

}

527

509

528

510

/* GnuTLS server initialization */

529

511

ret = gnutls_dh_params_init(&mc.dh_params);

530

512

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

513

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

514

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

534

515

goto globalfail;

535

516

}

536

517

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

537

518

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

540

521

goto globalfail;

541

522

}

542

523

562

543

}

563

544

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

564

545

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

568

548

}

569

549

570

550

{

577

557

}

578

558

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

579

559

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

583

563

gnutls_deinit(*session);

584

564

return -1;

585

565

}

594

574

}

595

575

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

596

576

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

599

579

gnutls_deinit(*session);

600

580

return -1;

601

581

}

646

626

pf = PF_INET;

647

627

break;

648

628

default:

649

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

629

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

650

630

errno = EINVAL;

651

631

return -1;

652

632

}

657

637

}

658

638

659

639

if(debug){

660

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

661

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

662

642

}

663

643

664

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

670

}

691

671

if(ret == 0){

692

672

int e = errno;

693

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

673

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

694

674

errno = e;

695

675

goto mandos_end;

696

676

}

701

681

702

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

683

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

704

-Wunreachable-code*/

684

-Wunreachable-code*/

705

685

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

708

688

errno = EINVAL;

709

689

goto mandos_end;

710

690

}

728

708

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

729

709

perror_plus("if_indextoname");

730

710

} else {

731

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

732

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

711

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

712

ip, interface, port);

733

713

}

734

714

} else {

735

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

736

ip, port);

715

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

716

port);

737

717

}

738

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

729

perror_plus("inet_ntop");

750

730

} else {

751

731

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

752

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

732

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

753

733

}

754

734

}

755

735

}

783

763

while(true){

784

764

size_t out_size = strlen(out);

785

765

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

786

out_size - written));

766

out_size - written));

787

767

if(ret == -1){

788

768

int e = errno;

789

769

perror_plus("write");

809

789

}

810

790

811

791

if(debug){

812

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

792

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

813

793

}

814

794

815

795

if(quit_now){

835

815

836

816

if(ret != GNUTLS_E_SUCCESS){

837

817

if(debug){

838

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

818

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

839

819

gnutls_perror(ret);

840

820

}

841

821

errno = EPROTO;

845

825

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

846

826

847

827

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

828

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

829

ip);

850

830

}

851

831

852

832

while(true){

857

837

}

858

838

859

839

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

840

buffer_capacity);

861

841

if(buffer_capacity == 0){

862

842

int e = errno;

863

843

perror_plus("incbuffer");

890

870

}

891

871

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

892

872

if(ret < 0){

893

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

894

"***\n");

873

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

895

874

gnutls_perror(ret);

896

875

errno = EPROTO;

897

876

goto mandos_end;

898

877

}

899

878

break;

900

879

default:

901

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

902

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

903

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

883

errno = EIO;

905

884

goto mandos_end;

910

889

}

911

890

912

891

if(debug){

913

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

892

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

914

893

}

915

894

916

895

if(quit_now){

928

907

929

908

if(buffer_length > 0){

930

909

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

932

912

&decrypted_buffer);

933

913

if(decrypted_buffer_size >= 0){

934

914

945

925

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

946

926

int e = errno;

947

927

if(debug){

948

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

949

strerror(errno));

928

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

929

strerror(errno));

950

930

}

951

931

errno = e;

952

932

goto mandos_end;

1009

989

switch(event){

1010

990

default:

1011

991

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1016

995

break;

1017

996

1018

997

case AVAHI_RESOLVER_FOUND:

1020

999

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1000

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

1022

1001

if(debug){

1023

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

1024

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

1025

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1026

1005

}

1027

1006

int ret = start_mandos_communication(ip, port, interface,

1028

1007

avahi_proto_to_af(proto));

1060

1039

default:

1061

1040

case AVAHI_BROWSER_FAILURE:

1062

1041

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1065

1044

avahi_simple_poll_quit(mc.simple_poll);

1066

1045

return;

1067

1046

1074

1053

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

1075

1054

name, type, domain, protocol, 0,

1076

1055

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1056

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

1057

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

1080

1058

break;

1081

1059

1082

1060

case AVAHI_BROWSER_REMOVE:

1085

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1065

if(debug){

1088

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

1089

" searching...\n");

1066

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

1090

1067

}

1091

1068

break;

1092

1069

}

1107

1084

errno = old_errno;

1108

1085

}

1109

1086

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1121

1143

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1123

1146

}

1124

return false;

1147

free(flagstring);

1148

return 0;

1125

1149

}

1126

return true;

1127

}

1128

1129

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

1130

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

1152

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1133

1154

if(debug){

1134

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

1135

ifname);

1155

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

1156

if_entry->d_name);

1136

1157

}

1137

return false;

1158

return 0;

1138

1159

}

1139

1160

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

1140

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

1161

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

1141

1162

if(debug){

1142

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

1143

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

1163

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

1164

if_entry->d_name);

1144

1165

}

1145

return true;

1166

return 1;

1146

1167

}

1147

1168

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

1148

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

1169

if(not (flags & IFF_BROADCAST)){

1149

1170

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1171

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

1172

if_entry->d_name);

1152

1173

}

1153

return false;

1174

return 0;

1154

1175

}

1155

1176

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1157

1178

if(debug){

1158

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

1159

ifname);

1179

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

1180

if_entry->d_name);

1160

1181

}

1161

return false;

1182

return 0;

1162

1183

}

1163

1164

1184

/* Accept this device */

1165

1185

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1186

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

1187

if_entry->d_name);

1235

1188

}

1236

1189

return 1;

1237

1190

}

1247

1200

return 1;

1248

1201

}

1249

1202

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

if(debug){

1305

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

1306

direntry->d_name);

1307

}

1308

return 1;

1309

}

1310

1311

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1312

1204

int ret;

1313

1205

struct timespec now;

1314

1206

struct timespec waited_time;

1315

1207

intmax_t block_time;

1316

1208

1317

1209

while(true){

1318

1210

if(mc.current_server == NULL){

1319

1211

if (debug){

1320

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

1321

" No timeout!\n");

1212

fprintf(stderr,

1213

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

1322

1214

}

1323

1215

ret = avahi_simple_poll_iterate(s, -1);

1324

1216

} else {

1325

1217

if (debug){

1326

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

1327

" it, or wait\n");

1218

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

1219

" or wait\n");

1328

1220

}

1329

1221

/* the current time */

1330

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1344

1236

block_time = ((retry_interval

1345

1237

- ((intmax_t)waited_time.tv_sec * 1000))

1346

1238

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

1347

1239

1348

1240

if (debug){

1349

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

1350

block_time);

1241

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

1351

1242

}

1352

1243

1353

1244

if(block_time <= 0){

1354

1245

ret = start_mandos_communication(mc.current_server->ip,

1355

1246

mc.current_server->port,

1373

1264

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

1374

1265

}

1375

1266

if(ret != 0){

1376

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

1267

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

1377

1268

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

1378

1269

}

1379

1270

}

1380

1271

}

1381

1272

}

1382

1273

1383

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

1384

const float delay){

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1390

if(numhooks == -1){

1391

perror_plus("scandir");

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1399

perror_plus("asprintf");

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1444

free(delaystring);

1445

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

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

1484

}

1485

1486

1274

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

1487

1275

AvahiSServiceBrowser *sb = NULL;

1488

1276

int error;

1570

1358

.arg = "SECONDS",

1571

1359

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

1572

1360

.group = 2 },

1573

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

1574

.arg = "DIR",

1575

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

1576

.group = 2 },

1577

1361

/*

1578

1362

* These reproduce what we would get without ARGP_NO_HELP

1579

1363

*/

1627

1411

errno = 0;

1628

1412

retry_interval = strtod(arg, &tmp);

1629

1413

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

1630

or (retry_interval * 1000) > INT_MAX

1631

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1632

1415

argp_error(state, "Bad retry interval");

1633

1416

}

1634

1417

break;

1635

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

1636

hookdir = arg;

1637

break;

1638

1418

/*

1639

1419

* These reproduce what we would get without ARGP_NO_HELP

1640

1420

*/

1646

1426

argp_state_help(state, state->out_stream,

1647

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

1428

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

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

1429

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

1652

1430

exit(argp_err_exit_status);

1653

1431

break;

1654

1432

default:

1678

1456

}

1679

1457

}

1680

1458

1681

if(getuid() == 0){

1459

{

1682

1460

/* Work around Debian bug #633582:

1683

1461

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

1684

1462

struct stat st;

1690

1468

perror_plus("seteuid");

1691

1469

}

1692

1470

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1697

1478

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1708

1483

}

1709

1484

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1712

1487

}

1713

1488

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1718

1496

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1729

1501

}

1730

1502

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1733

1505

}

1734

1506

1735

1507

/* Lower privileges */

1740

1512

}

1741

1513

}

1742

1514

1743

/* Run network hooks */

1744

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

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

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

1764

}

1765

1766

1515

if(not debug){

1767

1516

avahi_set_log_function(empty_log);

1768

1517

}

1769

1518

1770

1519

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

1771

1520

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1774

1522

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

1523

if(ret >= 1){

1782

/* Pick the first interface returned */

1524

/* Pick the first good interface */

1783

1525

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

1784

1526

if(debug){

1785

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

1527

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

1786

1528

}

1787

1529

if(interface == NULL){

1788

1530

perror_plus("malloc");

1793

1535

free(direntries);

1794

1536

} else {

1795

1537

free(direntries);

1796

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

1538

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

1797

1539

exitcode = EXIT_FAILURE;

1798

1540

goto end;

1799

1541

}

1805

1547

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

1806

1548

mc.simple_poll = avahi_simple_poll_new();

1807

1549

if(mc.simple_poll == NULL){

1808

fprintf_plus(stderr,

1809

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

1550

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

1810

1551

exitcode = EX_UNAVAILABLE;

1811

1552

goto end;

1812

1553

}

1878

1619

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

1879

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

1621

if(if_index == 0){

1881

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

1622

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

1882

1623

exitcode = EX_UNAVAILABLE;

1883

1624

goto end;

1884

1625

}

2004

1745

#endif /* __linux__ */

2005

1746

/* Lower privileges */

2006

1747

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

2011

1760

}

2012

1761

}

2013

1762

2017

1766

2018

1767

ret = init_gnutls_global(pubkey, seckey);

2019

1768

if(ret == -1){

2020

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

1769

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

2021

1770

exitcode = EX_UNAVAILABLE;

2022

1771

goto end;

2023

1772

} else {

2039

1788

}

2040

1789

2041

1790

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

2042

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

1791

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

2043

1792

exitcode = EX_UNAVAILABLE;

2044

1793

goto end;

2045

1794

} else {

2055

1804

/* (Mainly meant for debugging) */

2056

1805

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

2057

1806

if(address == NULL){

2058

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

1807

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

2059

1808

exitcode = EX_USAGE;

2060

1809

goto end;

2061

1810

}

2069

1818

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

2070

1819

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

2071

1820

or tmpmax != (uint16_t)tmpmax){

2072

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

1821

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

2073

1822

exitcode = EX_USAGE;

2074

1823

goto end;

2075

1824

}

2080

1829

2081

1830

port = (uint16_t)tmpmax;

2082

1831

*address = '\0';

1832

address = connect_to;

2083

1833

/* Colon in address indicates IPv6 */

2084

1834

int af;

2085

if(strchr(connect_to, ':') != NULL){

1835

if(strchr(address, ':') != NULL){

2086

1836

af = AF_INET6;

2087

/* Accept [] around IPv6 address - see RFC 5952 */

2088

if(connect_to[0] == '[' and address[-1] == ']')

2089

{

2090

connect_to++;

2091

address[-1] = '\0';

2092

}

2093

1837

} else {

2094

1838

af = AF_INET;

2095

1839

}

2096

address = connect_to;

2097

1840

2098

1841

if(quit_now){

2099

1842

goto end;

2100

1843

}

2101

1844

2102

1845

while(not quit_now){

2103

1846

ret = start_mandos_communication(address, port, if_index, af);

2104

1847

if(quit_now or ret == 0){

2105

1848

break;

2106

1849

}

2107

if(debug){

2108

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

2109

(int)retry_interval);

2110

}

2111

sleep((int)retry_interval);

2112

}

2113

1850

sleep((int)retry_interval or 1);

1851

};

1852

2114

1853

if (not quit_now){

2115

1854

exitcode = EXIT_SUCCESS;

2116

1855

}

2117

1856

2118

1857

goto end;

2119

1858

}

2120

1859

2142

1881

2143

1882

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

2144

1883

if(mc.server == NULL){

2145

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

2146

avahi_strerror(error));

1884

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

1885

avahi_strerror(error));

2147

1886

exitcode = EX_UNAVAILABLE;

2148

1887

goto end;

2149

1888

}

2157

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

1897

NULL, 0, browse_callback, NULL);

2159

1898

if(sb == NULL){

2160

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

2161

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2162

1901

exitcode = EX_UNAVAILABLE;

2163

1902

goto end;

2164

1903

}

2170

1909

/* Run the main loop */

2171

1910

2172

1911

if(debug){

2173

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

1912

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

2174

1913

}

2175

1914

2176

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

1916

(int)(retry_interval * 1000));

2178

1917

if(debug){

2179

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

2180

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

1918

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

1919

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

2181

1920

}

2182

1921

2183

1922

end:

2184

1923

2185

1924

if(debug){

2186

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

1925

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

2187

1926

}

2188

1927

2189

1928

/* Cleanup things */

2205

1944

if(gpgme_initialized){

2206

1945

gpgme_release(mc.ctx);

2207

1946

}

2208

1947

2209

1948

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

2210

1949

has seen */

2211

1950

if(mc.current_server != NULL){

2217

1956

}

2218

1957

}

2219

1958

2220

/* Re-raise priviliges */

2221

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

2228

1966

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

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

1967

if(geteuid() == 0){

2235

1968

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

2236

1969

if(ret == -1){

2237

1970

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

1971

} else if(network.ifr_flags & IFF_UP) {

2239

1972

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

2240

1973

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

2241

1974

if(ret == -1){

2246

1979

if(ret == -1){

2247

1980

perror_plus("close");

2248

1981

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

2257

1988

}

2258

1989

}

2259

1990

2261

1992

if(tempdir_created){

2262

1993

struct dirent **direntries = NULL;

2263

1994

struct dirent *direntry = NULL;

2264

int numentries = scandir(tempdir, &direntries, notdotentries,

2265

alphasort);

2266

if (numentries > 0){

2267

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

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2268

1998

direntry = direntries[i];

2269

1999

char *fullname = NULL;

2270

2000

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

2275

2005

}

2276

2006

ret = remove(fullname);

2277

2007

if(ret == -1){

2278

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

2279

strerror(errno));

2008

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

2009

strerror(errno));

2280

2010

}

2281

2011

free(fullname);

2282

2012

}

2283

2013

}

2284

2014

2285

/* need to clean even if 0 because man page doesn't specify */

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2286

2017

free(direntries);

2287

if (numentries == -1){

2018

if (ret == -1){

2288

2019

perror_plus("scandir");

2289

2020

}

2290

2021

ret = rmdir(tempdir);