/mandos/release : revision 237.7.38

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){

201

187

return buffer_capacity;

202

188

}

203

189

204

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

205

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

206

int af){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

207

193

int ret;

208

194

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

209

195

if(new_server == NULL){

211

197

return -1;

212

198

}

213

199

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

217

203

if(new_server->ip == NULL){

218

204

perror_plus("strdup");

219

205

return -1;

220

206

}

221

/* Special case of first server */

207

/* unique case of first server */

222

208

if (mc.current_server == NULL){

223

209

new_server->next = new_server;

224

210

new_server->prev = new_server;

225

211

mc.current_server = new_server;

226

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

212

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

227

213

} else {

228

214

new_server->next = mc.current_server;

229

215

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

241

227

/*

242

228

* Initialize GPGME.

243

229

*/

244

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

245

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

246

232

gpgme_error_t rc;

247

233

gpgme_engine_info_t engine_info;

248

234

263

249

264

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

251

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));

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

268

254

return false;

269

255

}

270

256

271

257

rc = gpgme_op_import(mc.ctx, pgp_data);

272

258

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

275

261

return false;

276

262

}

277

263

284

270

}

285

271

286

272

if(debug){

287

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

273

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

288

274

}

289

275

290

276

/* Init GPGME */

291

277

gpgme_check_version(NULL);

292

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

279

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));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

296

282

return false;

297

283

}

298

284

299

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

285

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

300

286

rc = gpgme_get_engine_info(&engine_info);

301

287

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));

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

304

290

return false;

305

291

}

306

292

while(engine_info != NULL){

312

298

engine_info = engine_info->next;

313

299

}

314

300

if(engine_info == NULL){

315

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

316

tempdir);

301

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

317

302

return false;

318

303

}

319

304

320

305

/* Create new GPGME "context" */

321

306

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

322

307

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));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

326

310

return false;

327

311

}

328

312

347

331

ssize_t plaintext_length = 0;

348

332

349

333

if(debug){

350

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

334

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

351

335

}

352

336

353

337

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

354

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

339

0);

356

340

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));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

359

343

return -1;

360

344

}

361

345

362

346

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

363

347

rc = gpgme_data_new(&dh_plain);

364

348

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));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

368

351

gpgme_data_release(dh_crypto);

369

352

return -1;

370

353

}

373

356

data buffer */

374

357

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

375

358

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

378

361

plaintext_length = -1;

379

362

if(debug){

380

363

gpgme_decrypt_result_t result;

381

364

result = gpgme_op_decrypt_result(mc.ctx);

382

365

if(result == NULL){

383

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

366

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

384

367

} 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);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

389

372

if(result->file_name != NULL){

390

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

373

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

391

374

}

392

375

gpgme_recipient_t recipient;

393

376

recipient = result->recipients;

394

377

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");

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");

402

384

recipient = recipient->next;

403

385

}

404

386

}

407

389

}

408

390

409

391

if(debug){

410

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

392

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

411

393

}

412

394

413

395

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

420

402

*plaintext = NULL;

421

403

while(true){

422

404

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

425

407

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

429

411

}

430

412

431

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

444

426

}

445

427

446

428

if(debug){

447

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

429

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

448

430

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

449

431

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

450

432

}

472

454

/* GnuTLS log function callback */

473

455

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

474

456

const char* string){

475

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

457

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

476

458

}

477

459

478

460

static int init_gnutls_global(const char *pubkeyfilename,

480

462

int ret;

481

463

482

464

if(debug){

483

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

465

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

484

466

}

485

467

486

468

ret = gnutls_global_init();

487

469

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

490

472

return -1;

491

473

}

492

474

501

483

/* OpenPGP credentials */

502

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

503

485

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

506

488

gnutls_global_deinit();

507

489

return -1;

508

490

}

509

491

510

492

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);

493

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

494

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

495

seckeyfilename);

515

496

}

516

497

517

498

ret = gnutls_certificate_set_openpgp_key_file

518

499

(mc.cred, pubkeyfilename, seckeyfilename,

519

500

GNUTLS_OPENPGP_FMT_BASE64);

520

501

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));

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));

526

507

goto globalfail;

527

508

}

528

509

529

510

/* GnuTLS server initialization */

530

511

ret = gnutls_dh_params_init(&mc.dh_params);

531

512

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

513

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

514

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

535

515

goto globalfail;

536

516

}

537

517

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

538

518

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

541

521

goto globalfail;

542

522

}

543

523

563

543

}

564

544

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

565

545

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

569

548

}

570

549

571

550

{

578

557

}

579

558

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

580

559

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));

560

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

561

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

562

safer_gnutls_strerror(ret));

584

563

gnutls_deinit(*session);

585

564

return -1;

586

565

}

595

574

}

596

575

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

597

576

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

600

579

gnutls_deinit(*session);

601

580

return -1;

602

581

}

647

626

pf = PF_INET;

648

627

break;

649

628

default:

650

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

629

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

651

630

errno = EINVAL;

652

631

return -1;

653

632

}

658

637

}

659

638

660

639

if(debug){

661

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

662

PRIu16 "\n", ip, port);

640

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

641

"\n", ip, port);

663

642

}

664

643

665

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

691

670

}

692

671

if(ret == 0){

693

672

int e = errno;

694

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

673

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

695

674

errno = e;

696

675

goto mandos_end;

697

676

}

702

681

703

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

683

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

705

-Wunreachable-code*/

684

-Wunreachable-code*/

706

685

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

709

688

errno = EINVAL;

710

689

goto mandos_end;

711

690

}

729

708

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

730

709

perror_plus("if_indextoname");

731

710

} else {

732

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

733

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

711

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

712

ip, interface, port);

734

713

}

735

714

} else {

736

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

737

ip, port);

715

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

716

port);

738

717

}

739

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

729

perror_plus("inet_ntop");

751

730

} else {

752

731

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

753

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

732

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

754

733

}

755

734

}

756

735

}

784

763

while(true){

785

764

size_t out_size = strlen(out);

786

765

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

787

out_size - written));

766

out_size - written));

788

767

if(ret == -1){

789

768

int e = errno;

790

769

perror_plus("write");

810

789

}

811

790

812

791

if(debug){

813

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

792

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

814

793

}

815

794

816

795

if(quit_now){

836

815

837

816

if(ret != GNUTLS_E_SUCCESS){

838

817

if(debug){

839

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

818

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

840

819

gnutls_perror(ret);

841

820

}

842

821

errno = EPROTO;

846

825

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

847

826

848

827

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

828

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

829

ip);

851

830

}

852

831

853

832

while(true){

858

837

}

859

838

860

839

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

840

buffer_capacity);

862

841

if(buffer_capacity == 0){

863

842

int e = errno;

864

843

perror_plus("incbuffer");

891

870

}

892

871

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

893

872

if(ret < 0){

894

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

895

"***\n");

873

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

896

874

gnutls_perror(ret);

897

875

errno = EPROTO;

898

876

goto mandos_end;

899

877

}

900

878

break;

901

879

default:

902

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

903

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

904

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

883

errno = EIO;

906

884

goto mandos_end;

911

889

}

912

890

913

891

if(debug){

914

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

892

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

915

893

}

916

894

917

895

if(quit_now){

929

907

930

908

if(buffer_length > 0){

931

909

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

933

912

&decrypted_buffer);

934

913

if(decrypted_buffer_size >= 0){

935

914

946

925

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

947

926

int e = errno;

948

927

if(debug){

949

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

950

strerror(errno));

928

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

929

strerror(errno));

951

930

}

952

931

errno = e;

953

932

goto mandos_end;

1010

989

switch(event){

1011

990

default:

1012

991

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)));

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)));

1017

995

break;

1018

996

1019

997

case AVAHI_RESOLVER_FOUND:

1021

999

char ip[AVAHI_ADDRESS_STR_MAX];

1022

1000

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

1023

1001

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);

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);

1027

1005

}

1028

1006

int ret = start_mandos_communication(ip, port, interface,

1029

1007

avahi_proto_to_af(proto));

1061

1039

default:

1062

1040

case AVAHI_BROWSER_FAILURE:

1063

1041

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1066

1044

avahi_simple_poll_quit(mc.simple_poll);

1067

1045

return;

1068

1046

1075

1053

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

1076

1054

name, type, domain, protocol, 0,

1077

1055

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

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)));

1081

1058

break;

1082

1059

1083

1060

case AVAHI_BROWSER_REMOVE:

1086

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

1065

if(debug){

1089

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

1090

" searching...\n");

1066

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

1091

1067

}

1092

1068

break;

1093

1069

}

1108

1084

errno = old_errno;

1109

1085

}

1110

1086

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

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){

1122

1143

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1124

1146

}

1125

return false;

1147

free(flagstring);

1148

return 0;

1126

1149

}

1127

return true;

1128

}

1129

1130

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

1131

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1132

1152

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1134

1154

if(debug){

1135

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

1136

ifname);

1155

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

1156

if_entry->d_name);

1137

1157

}

1138

return false;

1158

return 0;

1139

1159

}

1140

1160

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

1141

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

1161

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

1142

1162

if(debug){

1143

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

1144

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

1163

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

1164

if_entry->d_name);

1145

1165

}

1146

return true;

1166

return 1;

1147

1167

}

1148

1168

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

1149

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

1169

if(not (flags & IFF_BROADCAST)){

1150

1170

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1171

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

1172

if_entry->d_name);

1153

1173

}

1154

return false;

1174

return 0;

1155

1175

}

1156

1176

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1158

1178

if(debug){

1159

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

1160

ifname);

1179

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

1180

if_entry->d_name);

1161

1181

}

1162

return false;

1182

return 0;

1163

1183

}

1164

1165

1184

/* Accept this device */

1166

1185

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1186

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

1187

if_entry->d_name);

1236

1188

}

1237

1189

return 1;

1238

1190

}

1248

1200

return 1;

1249

1201

}

1250

1202

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

1204

int ret;

1314

1205

struct timespec now;

1315

1206

struct timespec waited_time;

1316

1207

intmax_t block_time;

1317

1208

1318

1209

while(true){

1319

1210

if(mc.current_server == NULL){

1320

1211

if (debug){

1321

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

1322

" No timeout!\n");

1212

fprintf(stderr,

1213

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

1323

1214

}

1324

1215

ret = avahi_simple_poll_iterate(s, -1);

1325

1216

} else {

1326

1217

if (debug){

1327

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

1328

" it, or wait\n");

1218

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

1219

" or wait\n");

1329

1220

}

1330

1221

/* the current time */

1331

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1345

1236

block_time = ((retry_interval

1346

1237

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

1347

1238

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

1348

1239

1349

1240

if (debug){

1350

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

1351

block_time);

1241

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

1352

1242

}

1353

1243

1354

1244

if(block_time <= 0){

1355

1245

ret = start_mandos_communication(mc.current_server->ip,

1356

1246

mc.current_server->port,

1374

1264

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

1375

1265

}

1376

1266

if(ret != 0){

1377

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

1267

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

1378

1268

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

1379

1269

}

1380

1270

}

1381

1271

}

1382

1272

}

1383

1273

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1436

dup2(devnull, STDIN_FILENO);

1437

close(devnull);

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1439

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

1440

if(ret == -1){

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1444

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

1445

if(ret == -1){

1446

perror_plus("setenv");

1447

_exit(EX_OSERR);

1448

}

1449

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

1450

if(ret == -1){

1451

perror_plus("setenv");

1452

_exit(EX_OSERR);

1453

}

1454

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

1455

if(ret == -1){

1456

perror_plus("setenv");

1457

_exit(EX_OSERR);

1458

}

1459

char *delaystring;

1460

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

1461

if(ret == -1){

1462

perror_plus("asprintf");

1463

_exit(EX_OSERR);

1464

}

1465

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

1466

if(ret == -1){

1467

free(delaystring);

1468

perror_plus("setenv");

1469

_exit(EX_OSERR);

1470

}

1471

free(delaystring);

1472

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

1473

perror_plus("execl");

1474

} else {

1475

int status;

1476

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

1477

perror_plus("waitpid");

1478

free(fullname);

1479

continue;

1480

}

1481

if(WIFEXITED(status)){

1482

if(WEXITSTATUS(status) != 0){

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

WTERMSIG(status));

1493

free(fullname);

1494

continue;

1495

} else {

1496

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

1497

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

1498

free(fullname);

1499

continue;

1500

}

1501

}

1502

free(fullname);

1503

if(debug){

1504

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

1505

direntry->d_name);

1506

}

1507

}

1508

close(devnull);

1509

}

1510

return true;

1511

}

1512

1513

1274

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

1514

1275

AvahiSServiceBrowser *sb = NULL;

1515

1276

int error;

1597

1358

.arg = "SECONDS",

1598

1359

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

1599

1360

.group = 2 },

1600

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

1601

.arg = "DIR",

1602

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

1603

.group = 2 },

1604

1361

/*

1605

1362

* These reproduce what we would get without ARGP_NO_HELP

1606

1363

*/

1654

1411

errno = 0;

1655

1412

retry_interval = strtod(arg, &tmp);

1656

1413

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

1657

or (retry_interval * 1000) > INT_MAX

1658

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1659

1415

argp_error(state, "Bad retry interval");

1660

1416

}

1661

1417

break;

1662

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

1663

hookdir = arg;

1664

break;

1665

1418

/*

1666

1419

* These reproduce what we would get without ARGP_NO_HELP

1667

1420

*/

1673

1426

argp_state_help(state, state->out_stream,

1674

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1675

1428

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1678

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

1429

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

1679

1430

exit(argp_err_exit_status);

1680

1431

break;

1681

1432

default:

1708

1459

{

1709

1460

/* Work around Debian bug #633582:

1710

1461

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

1462

struct stat st;

1711

1463

1712

1464

/* Re-raise priviliges */

1713

1465

errno = 0;

1714

1466

ret = seteuid(0);

1715

1467

if(ret == -1){

1716

1468

perror_plus("seteuid");

1717

} else {

1718

struct stat st;

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

if(S_ISREG(st.st_mode)

1730

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

1731

ret = fchown(seckey_fd, uid, gid);

1732

if(ret == -1){

1733

perror_plus("fchown");

1734

}

1735

}

1736

}

1737

TEMP_FAILURE_RETRY(close(seckey_fd));

1738

}

1739

}

1740

1741

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

1742

int pubkey_fd = open(pubkey, O_RDONLY);

1743

if(pubkey_fd == -1){

1744

perror_plus("open");

1745

} else {

1746

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

1747

if(ret == -1){

1748

perror_plus("fstat");

1749

} else {

1750

if(S_ISREG(st.st_mode)

1751

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

1752

ret = fchown(pubkey_fd, uid, gid);

1753

if(ret == -1){

1754

perror_plus("fchown");

1755

}

1756

}

1757

}

1758

TEMP_FAILURE_RETRY(close(pubkey_fd));

1759

}

1760

}

1761

1762

/* Lower privileges */

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

1767

}

1768

}

1769

}

1770

1771

/* Run network hooks */

1772

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

1773

goto end;

1469

}

1470

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");

1478

} else {

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");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

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");

1496

} else {

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");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

1774

1513

}

1775

1514

1776

1515

if(not debug){

1777

1516

avahi_set_log_function(empty_log);

1778

1517

}

1779

1518

1780

1519

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

1781

1520

struct dirent **direntries;

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1784

1522

alphasort);

1785

if(ret == 0){

1786

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

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1791

1523

if(ret >= 1){

1792

/* Pick the first interface returned */

1524

/* Pick the first good interface */

1793

1525

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

1794

1526

if(debug){

1795

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

1527

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

1796

1528

}

1797

1529

if(interface == NULL){

1798

1530

perror_plus("malloc");

1803

1535

free(direntries);

1804

1536

} else {

1805

1537

free(direntries);

1806

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

1538

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

1807

1539

exitcode = EXIT_FAILURE;

1808

1540

goto end;

1809

1541

}

1815

1547

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

1816

1548

mc.simple_poll = avahi_simple_poll_new();

1817

1549

if(mc.simple_poll == NULL){

1818

fprintf_plus(stderr,

1819

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

1550

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

1820

1551

exitcode = EX_UNAVAILABLE;

1821

1552

goto end;

1822

1553

}

1888

1619

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

1889

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1890

1621

if(if_index == 0){

1891

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

1622

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

1892

1623

exitcode = EX_UNAVAILABLE;

1893

1624

goto end;

1894

1625

}

2014

1745

#endif /* __linux__ */

2015

1746

/* Lower privileges */

2016

1747

errno = 0;

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

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

}

2021

1760

}

2022

1761

}

2023

1762

2027

1766

2028

1767

ret = init_gnutls_global(pubkey, seckey);

2029

1768

if(ret == -1){

2030

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

1769

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

2031

1770

exitcode = EX_UNAVAILABLE;

2032

1771

goto end;

2033

1772

} else {

2049

1788

}

2050

1789

2051

1790

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

2052

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

1791

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

2053

1792

exitcode = EX_UNAVAILABLE;

2054

1793

goto end;

2055

1794

} else {

2065

1804

/* (Mainly meant for debugging) */

2066

1805

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

2067

1806

if(address == NULL){

2068

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

1807

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

2069

1808

exitcode = EX_USAGE;

2070

1809

goto end;

2071

1810

}

2079

1818

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

2080

1819

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

2081

1820

or tmpmax != (uint16_t)tmpmax){

2082

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

1821

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

2083

1822

exitcode = EX_USAGE;

2084

1823

goto end;

2085

1824

}

2090

1829

2091

1830

port = (uint16_t)tmpmax;

2092

1831

*address = '\0';

1832

address = connect_to;

2093

1833

/* Colon in address indicates IPv6 */

2094

1834

int af;

2095

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

1835

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

2096

1836

af = AF_INET6;

2097

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

2098

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

2099

{

2100

connect_to++;

2101

address[-1] = '\0';

2102

}

2103

1837

} else {

2104

1838

af = AF_INET;

2105

1839

}

2106

address = connect_to;

2107

1840

2108

1841

if(quit_now){

2109

1842

goto end;

2110

1843

}

2111

1844

2112

1845

while(not quit_now){

2113

1846

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

2114

1847

if(quit_now or ret == 0){

2115

1848

break;

2116

1849

}

2117

if(debug){

2118

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

2119

(int)retry_interval);

2120

}

2121

sleep((int)retry_interval);

2122

}

2123

1850

sleep((int)retry_interval or 1);

1851

};

1852

2124

1853

if (not quit_now){

2125

1854

exitcode = EXIT_SUCCESS;

2126

1855

}

2127

1856

2128

1857

goto end;

2129

1858

}

2130

1859

2152

1881

2153

1882

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

2154

1883

if(mc.server == NULL){

2155

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

2156

avahi_strerror(error));

1884

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

1885

avahi_strerror(error));

2157

1886

exitcode = EX_UNAVAILABLE;

2158

1887

goto end;

2159

1888

}

2167

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2168

1897

NULL, 0, browse_callback, NULL);

2169

1898

if(sb == NULL){

2170

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

2171

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)));

2172

1901

exitcode = EX_UNAVAILABLE;

2173

1902

goto end;

2174

1903

}

2180

1909

/* Run the main loop */

2181

1910

2182

1911

if(debug){

2183

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

1912

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

2184

1913

}

2185

1914

2186

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2187

1916

(int)(retry_interval * 1000));

2188

1917

if(debug){

2189

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

2190

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

1918

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

1919

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

2191

1920

}

2192

1921

2193

1922

end:

2194

1923

2195

1924

if(debug){

2196

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

1925

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

2197

1926

}

2198

1927

2199

1928

/* Cleanup things */

2215

1944

if(gpgme_initialized){

2216

1945

gpgme_release(mc.ctx);

2217

1946

}

2218

1947

2219

1948

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

2220

1949

has seen */

2221

1950

if(mc.current_server != NULL){

2227

1956

}

2228

1957

}

2229

1958

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Re-raise priviliges */

2234

{

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

2235

1962

errno = 0;

2236

1963

ret = seteuid(0);

2237

1964

if(ret == -1){

2238

1965

perror_plus("seteuid");

2239

1966

}

2240

2241

/* Take down the network interface */

2242

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

1967

if(geteuid() == 0){

2243

1968

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

2244

1969

if(ret == -1){

2245

1970

perror_plus("ioctl SIOCGIFFLAGS");

2246

} else if(network.ifr_flags & IFF_UP){

1971

} else if(network.ifr_flags & IFF_UP) {

2247

1972

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

2248

1973

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

2249

1974

if(ret == -1){

2254

1979

if(ret == -1){

2255

1980

perror_plus("close");

2256

1981

}

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

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2265

1990

2266

1991

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

2267

1992

if(tempdir_created){

2268

1993

struct dirent **direntries = NULL;

2269

1994

struct dirent *direntry = NULL;

2270

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

2271

alphasort);

2272

if (numentries > 0){

2273

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++){

2274

1998

direntry = direntries[i];

2275

1999

char *fullname = NULL;

2276

2000

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

2281

2005

}

2282

2006

ret = remove(fullname);

2283

2007

if(ret == -1){

2284

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

2285

strerror(errno));

2008

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

2009

strerror(errno));

2286

2010

}

2287

2011

free(fullname);

2288

2012

}

2289

2013

}

2290

2014

2291

/* 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 */

2292

2017

free(direntries);

2293

if (numentries == -1){

2018

if (ret == -1){

2294

2019

perror_plus("scandir");

2295

2020

}

2296

2021

ret = rmdir(tempdir);