/mandos/release : revision 237.7.78

26

* along with this program. If not, see

27

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

28

*

29

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

29

* Contact the authors at <mandos@recompile.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() */

56

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

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() */

76

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

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() */

88

91

89

92

#ifdef __linux__

90

93

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

108

111

init_gnutls_session(),

109

112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

113

116

114

117

/* GPGME */

115

118

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

123

126

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

124

127

#define SECKEY "seckey.txt"

125

128

#define PUBKEY "pubkey.txt"

129

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

126

130

127

131

bool debug = false;

128

132

static const char mandos_protocol_version[] = "1";

129

133

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

130

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

134

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

131

135

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

132

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

133

138

134

139

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

135

140

typedef struct server{

170

175

perror(print_text);

171

176

}

172

177

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

173

187

/*

174

188

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

175

189

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

176

190

* "buffer_length" is how much is already used.

177

191

*/

178

192

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

193

size_t buffer_capacity){

180

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

195

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

182

196

if(buffer == NULL){

187

201

return buffer_capacity;

188

202

}

189

203

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

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){

193

207

int ret;

194

208

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

195

209

if(new_server == NULL){

197

211

return -1;

198

212

}

199

213

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

200

.port = port,

201

.if_index = if_index,

202

.af = af };

214

.port = port,

215

.if_index = if_index,

216

.af = af };

203

217

if(new_server->ip == NULL){

204

218

perror_plus("strdup");

205

219

return -1;

206

220

}

207

/* unique case of first server */

221

/* Special case of first server */

208

222

if (mc.current_server == NULL){

209

223

new_server->next = new_server;

210

224

new_server->prev = new_server;

211

225

mc.current_server = new_server;

212

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

226

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

213

227

} else {

214

228

new_server->next = mc.current_server;

215

229

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

227

241

/*

228

242

* Initialize GPGME.

229

243

*/

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

232

246

gpgme_error_t rc;

233

247

gpgme_engine_info_t engine_info;

234

248

249

263

250

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

251

265

if(rc != GPG_ERR_NO_ERROR){

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

254

268

return false;

255

269

}

256

270

257

271

rc = gpgme_op_import(mc.ctx, pgp_data);

258

272

if(rc != GPG_ERR_NO_ERROR){

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

261

275

return false;

262

276

}

263

277

270

284

}

271

285

272

286

if(debug){

273

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

287

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

274

288

}

275

289

276

290

/* Init GPGME */

277

291

gpgme_check_version(NULL);

278

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

279

293

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

282

296

return false;

283

297

}

284

298

285

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

299

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

286

300

rc = gpgme_get_engine_info(&engine_info);

287

301

if(rc != GPG_ERR_NO_ERROR){

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

290

304

return false;

291

305

}

292

306

while(engine_info != NULL){

298

312

engine_info = engine_info->next;

299

313

}

300

314

if(engine_info == NULL){

301

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

315

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

316

tempdir);

302

317

return false;

303

318

}

304

319

305

320

/* Create new GPGME "context" */

306

321

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

307

322

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

310

326

return false;

311

327

}

312

328

331

347

ssize_t plaintext_length = 0;

332

348

333

349

if(debug){

334

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

350

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

335

351

}

336

352

337

353

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

338

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

355

0);

340

356

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

343

359

return -1;

344

360

}

345

361

346

362

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

347

363

rc = gpgme_data_new(&dh_plain);

348

364

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

351

368

gpgme_data_release(dh_crypto);

352

369

return -1;

353

370

}

356

373

data buffer */

357

374

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

358

375

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

361

378

plaintext_length = -1;

362

379

if(debug){

363

380

gpgme_decrypt_result_t result;

364

381

result = gpgme_op_decrypt_result(mc.ctx);

365

382

if(result == NULL){

366

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

383

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

367

384

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

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);

372

389

if(result->file_name != NULL){

373

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

390

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

374

391

}

375

392

gpgme_recipient_t recipient;

376

393

recipient = result->recipients;

377

394

while(recipient != NULL){

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");

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");

384

402

recipient = recipient->next;

385

403

}

386

404

}

389

407

}

390

408

391

409

if(debug){

392

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

410

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

393

411

}

394

412

395

413

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

402

420

*plaintext = NULL;

403

421

while(true){

404

422

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

407

425

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

411

429

}

412

430

413

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

444

}

427

445

428

446

if(debug){

429

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

447

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

430

448

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

431

449

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

432

450

}

454

472

/* GnuTLS log function callback */

455

473

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

456

474

const char* string){

457

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

475

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

458

476

}

459

477

460

478

static int init_gnutls_global(const char *pubkeyfilename,

462

480

int ret;

463

481

464

482

if(debug){

465

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

483

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

466

484

}

467

485

468

486

ret = gnutls_global_init();

469

487

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

472

490

return -1;

473

491

}

474

492

483

501

/* OpenPGP credentials */

484

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

485

503

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

488

506

gnutls_global_deinit();

489

507

return -1;

490

508

}

491

509

492

510

if(debug){

493

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

494

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

495

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

496

515

}

497

516

498

517

ret = gnutls_certificate_set_openpgp_key_file

499

518

(mc.cred, pubkeyfilename, seckeyfilename,

500

519

GNUTLS_OPENPGP_FMT_BASE64);

501

520

if(ret != GNUTLS_E_SUCCESS){

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));

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));

507

526

goto globalfail;

508

527

}

509

528

510

529

/* GnuTLS server initialization */

511

530

ret = gnutls_dh_params_init(&mc.dh_params);

512

531

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

515

535

goto globalfail;

516

536

}

517

537

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

518

538

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

521

541

goto globalfail;

522

542

}

523

543

563

}

544

564

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

545

565

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

548

569

}

549

570

550

571

{

557

578

}

558

579

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

559

580

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

563

584

gnutls_deinit(*session);

564

585

return -1;

565

586

}

574

595

}

575

596

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

576

597

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

579

600

gnutls_deinit(*session);

580

601

return -1;

581

602

}

626

647

pf = PF_INET;

627

648

break;

628

649

default:

629

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

650

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

630

651

errno = EINVAL;

631

652

return -1;

632

653

}

637

658

}

638

659

639

660

if(debug){

640

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

641

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

642

663

}

643

664

644

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

691

}

671

692

if(ret == 0){

672

693

int e = errno;

673

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

694

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

674

695

errno = e;

675

696

goto mandos_end;

676

697

}

681

702

682

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

704

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

684

-Wunreachable-code*/

705

-Wunreachable-code*/

685

706

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

688

709

errno = EINVAL;

689

710

goto mandos_end;

690

711

}

708

729

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

709

730

perror_plus("if_indextoname");

710

731

} else {

711

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

712

ip, interface, port);

732

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

733

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

713

734

}

714

735

} else {

715

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

716

port);

736

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

737

ip, port);

717

738

}

718

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

750

perror_plus("inet_ntop");

730

751

} else {

731

752

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

732

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

753

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

733

754

}

734

755

}

735

756

}

763

784

while(true){

764

785

size_t out_size = strlen(out);

765

786

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

766

out_size - written));

787

out_size - written));

767

788

if(ret == -1){

768

789

int e = errno;

769

790

perror_plus("write");

789

810

}

790

811

791

812

if(debug){

792

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

813

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

793

814

}

794

815

795

816

if(quit_now){

815

836

816

837

if(ret != GNUTLS_E_SUCCESS){

817

838

if(debug){

818

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

839

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

819

840

gnutls_perror(ret);

820

841

}

821

842

errno = EPROTO;

825

846

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

826

847

827

848

if(debug){

828

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

829

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

830

851

}

831

852

832

853

while(true){

837

858

}

838

859

839

860

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

861

buffer_capacity);

841

862

if(buffer_capacity == 0){

842

863

int e = errno;

843

864

perror_plus("incbuffer");

870

891

}

871

892

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

872

893

if(ret < 0){

873

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

894

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

895

"***\n");

874

896

gnutls_perror(ret);

875

897

errno = EPROTO;

876

898

goto mandos_end;

877

899

}

878

900

break;

879

901

default:

880

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

881

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

882

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

905

errno = EIO;

884

906

goto mandos_end;

889

911

}

890

912

891

913

if(debug){

892

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

914

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

893

915

}

894

916

895

917

if(quit_now){

907

929

908

930

if(buffer_length > 0){

909

931

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

933

&decrypted_buffer);

913

934

if(decrypted_buffer_size >= 0){

914

935

925

946

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

926

947

int e = errno;

927

948

if(debug){

928

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

929

strerror(errno));

949

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

950

strerror(errno));

930

951

}

931

952

errno = e;

932

953

goto mandos_end;

989

1010

switch(event){

990

1011

default:

991

1012

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

995

1017

break;

996

1018

997

1019

case AVAHI_RESOLVER_FOUND:

999

1021

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1022

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

1001

1023

if(debug){

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);

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);

1005

1027

}

1006

1028

int ret = start_mandos_communication(ip, port, interface,

1007

1029

avahi_proto_to_af(proto));

1039

1061

default:

1040

1062

case AVAHI_BROWSER_FAILURE:

1041

1063

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1044

1066

avahi_simple_poll_quit(mc.simple_poll);

1045

1067

return;

1046

1068

1053

1075

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

1054

1076

name, type, domain, protocol, 0,

1055

1077

resolve_callback, NULL) == NULL)

1056

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

1057

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1058

1081

break;

1059

1082

1060

1083

case AVAHI_BROWSER_REMOVE:

1063

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1088

if(debug){

1066

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

1089

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

1090

" searching...\n");

1067

1091

}

1068

1092

break;

1069

1093

}

1084

1108

errno = old_errno;

1085

1109

}

1086

1110

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){

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){

1143

1122

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1123

perror_plus("ioctl SIOCGIFFLAGS");

1146

1124

}

1147

free(flagstring);

1148

return 0;

1125

return false;

1149

1126

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1127

return true;

1128

}

1129

1130

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

1131

1152

1132

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1134

if(debug){

1155

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

1156

if_entry->d_name);

1135

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

1136

ifname);

1157

1137

}

1158

return 0;

1138

return false;

1159

1139

}

1160

1140

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

1161

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

1141

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

1162

1142

if(debug){

1163

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

1164

if_entry->d_name);

1143

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

1144

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

1165

1145

}

1166

return 1;

1146

return true;

1167

1147

}

1168

1148

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

1169

if(not (flags & IFF_BROADCAST)){

1149

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

1170

1150

if(debug){

1171

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

1172

if_entry->d_name);

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1173

1153

}

1174

return 0;

1154

return false;

1175

1155

}

1176

1156

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

1177

if(flags & IFF_NOARP){

1157

if(ifr->ifr_flags & IFF_NOARP){

1178

1158

if(debug){

1179

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

1180

if_entry->d_name);

1159

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

1160

ifname);

1181

1161

}

1182

return 0;

1162

return false;

1183

1163

}

1164

1184

1165

/* Accept this device */

1185

1166

if(debug){

1186

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

1187

if_entry->d_name);

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;

1188

1236

}

1189

1237

return 1;

1190

1238

}

1200

1248

return 1;

1201

1249

}

1202

1250

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

1203

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1313

int ret;

1205

1314

struct timespec now;

1206

1315

struct timespec waited_time;

1207

1316

intmax_t block_time;

1208

1317

1209

1318

while(true){

1210

1319

if(mc.current_server == NULL){

1211

1320

if (debug){

1212

fprintf(stderr,

1213

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

1321

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

1322

" No timeout!\n");

1214

1323

}

1215

1324

ret = avahi_simple_poll_iterate(s, -1);

1216

1325

} else {

1217

1326

if (debug){

1218

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

1219

" or wait\n");

1327

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

1328

" it, or wait\n");

1220

1329

}

1221

1330

/* the current time */

1222

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1236

1345

block_time = ((retry_interval

1237

1346

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

1238

1347

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

1239

1348

1240

1349

if (debug){

1241

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

1350

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

1351

block_time);

1242

1352

}

1243

1353

1244

1354

if(block_time <= 0){

1245

1355

ret = start_mandos_communication(mc.current_server->ip,

1246

1356

mc.current_server->port,

1264

1374

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

1265

1375

}

1266

1376

if(ret != 0){

1267

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

1377

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

1268

1378

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

1269

1379

}

1270

1380

}

1271

1381

}

1272

1382

}

1273

1383

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

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1274

1511

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

1275

1512

AvahiSServiceBrowser *sb = NULL;

1276

1513

int error;

1358

1595

.arg = "SECONDS",

1359

1596

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

1360

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1361

1602

/*

1362

1603

* These reproduce what we would get without ARGP_NO_HELP

1363

1604

*/

1411

1652

errno = 0;

1412

1653

retry_interval = strtod(arg, &tmp);

1413

1654

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

1414

or (retry_interval * 1000) > INT_MAX){

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1415

1657

argp_error(state, "Bad retry interval");

1416

1658

}

1417

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1418

1663

/*

1419

1664

* These reproduce what we would get without ARGP_NO_HELP

1420

1665

*/

1426

1671

argp_state_help(state, state->out_stream,

1427

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

1673

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

1429

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1430

1677

exit(argp_err_exit_status);

1431

1678

break;

1432

1679

default:

1459

1706

{

1460

1707

/* Work around Debian bug #633582:

1461

1708

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

1462

struct stat st;

1463

1709

1464

1710

/* Re-raise priviliges */

1465

1711

errno = 0;

1466

1712

ret = seteuid(0);

1467

1713

if(ret == -1){

1468

1714

perror_plus("seteuid");

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

}

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1513

1772

}

1514

1773

1515

1774

if(not debug){

1516

1775

avahi_set_log_function(empty_log);

1517

1776

}

1518

1777

1519

1778

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

1520

1779

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1522

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1523

1789

if(ret >= 1){

1524

/* Pick the first good interface */

1790

/* Pick the first interface returned */

1525

1791

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

1526

1792

if(debug){

1527

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

1793

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

1528

1794

}

1529

1795

if(interface == NULL){

1530

1796

perror_plus("malloc");

1535

1801

free(direntries);

1536

1802

} else {

1537

1803

free(direntries);

1538

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

1804

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

1539

1805

exitcode = EXIT_FAILURE;

1540

1806

goto end;

1541

1807

}

1547

1813

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

1548

1814

mc.simple_poll = avahi_simple_poll_new();

1549

1815

if(mc.simple_poll == NULL){

1550

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

1816

fprintf_plus(stderr,

1817

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

1551

1818

exitcode = EX_UNAVAILABLE;

1552

1819

goto end;

1553

1820

}

1619

1886

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

1620

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1888

if(if_index == 0){

1622

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

1889

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

1623

1890

exitcode = EX_UNAVAILABLE;

1624

1891

goto end;

1625

1892

}

1745

2012

#endif /* __linux__ */

1746

2013

/* Lower privileges */

1747

2014

errno = 0;

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

}

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1760

2019

}

1761

2020

}

1762

2021

1766

2025

1767

2026

ret = init_gnutls_global(pubkey, seckey);

1768

2027

if(ret == -1){

1769

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

2028

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

1770

2029

exitcode = EX_UNAVAILABLE;

1771

2030

goto end;

1772

2031

} else {

1788

2047

}

1789

2048

1790

2049

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

1791

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

2050

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

1792

2051

exitcode = EX_UNAVAILABLE;

1793

2052

goto end;

1794

2053

} else {

1804

2063

/* (Mainly meant for debugging) */

1805

2064

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

1806

2065

if(address == NULL){

1807

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

2066

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

1808

2067

exitcode = EX_USAGE;

1809

2068

goto end;

1810

2069

}

1818

2077

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

1819

2078

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

1820

2079

or tmpmax != (uint16_t)tmpmax){

1821

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

2080

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

1822

2081

exitcode = EX_USAGE;

1823

2082

goto end;

1824

2083

}

1829

2088

1830

2089

port = (uint16_t)tmpmax;

1831

2090

*address = '\0';

1832

address = connect_to;

1833

2091

/* Colon in address indicates IPv6 */

1834

2092

int af;

1835

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

2093

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

1836

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1837

2101

} else {

1838

2102

af = AF_INET;

1839

2103

}

2104

address = connect_to;

1840

2105

1841

2106

if(quit_now){

1842

2107

goto end;

1843

2108

}

1844

2109

1845

2110

while(not quit_now){

1846

2111

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

1847

2112

if(quit_now or ret == 0){

1848

2113

break;

1849

2114

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

1853

2122

if (not quit_now){

1854

2123

exitcode = EXIT_SUCCESS;

1855

2124

}

1856

2125

1857

2126

goto end;

1858

2127

}

1859

2128

1881

2150

1882

2151

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

1883

2152

if(mc.server == NULL){

1884

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

1885

avahi_strerror(error));

2153

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

2154

avahi_strerror(error));

1886

2155

exitcode = EX_UNAVAILABLE;

1887

2156

goto end;

1888

2157

}

1896

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1897

2166

NULL, 0, browse_callback, NULL);

1898

2167

if(sb == NULL){

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

1901

2170

exitcode = EX_UNAVAILABLE;

1902

2171

goto end;

1903

2172

}

1909

2178

/* Run the main loop */

1910

2179

1911

2180

if(debug){

1912

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

2181

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

1913

2182

}

1914

2183

1915

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

2185

(int)(retry_interval * 1000));

1917

2186

if(debug){

1918

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

1919

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

2187

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

2188

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

1920

2189

}

1921

2190

1922

2191

end:

1923

2192

1924

2193

if(debug){

1925

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

2194

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

1926

2195

}

1927

2196

1928

2197

/* Cleanup things */

1944

2213

if(gpgme_initialized){

1945

2214

gpgme_release(mc.ctx);

1946

2215

}

1947

2216

1948

2217

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

1949

2218

has seen */

1950

2219

if(mc.current_server != NULL){

1956

2225

}

1957

2226

}

1958

2227

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

1962

2233

errno = 0;

1963

2234

ret = seteuid(0);

1964

2235

if(ret == -1){

1965

2236

perror_plus("seteuid");

1966

2237

}

1967

if(geteuid() == 0){

2238

2239

/* Take down the network interface */

2240

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

1968

2241

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

1969

2242

if(ret == -1){

1970

2243

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

2244

} else if(network.ifr_flags & IFF_UP){

1972

2245

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

1973

2246

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

1974

2247

if(ret == -1){

1979

2252

if(ret == -1){

1980

2253

perror_plus("close");

1981

2254

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

1988

2255

}

1989

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

1990

2263

1991

2264

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

1992

2265

if(tempdir_created){

1993

2266

struct dirent **direntries = NULL;

1994

2267

struct dirent *direntry = NULL;

1995

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

1996

if (ret > 0){

1997

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

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

1998

2272

direntry = direntries[i];

1999

2273

char *fullname = NULL;

2000

2274

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

2005

2279

}

2006

2280

ret = remove(fullname);

2007

2281

if(ret == -1){

2008

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

2009

strerror(errno));

2282

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

2283

strerror(errno));

2010

2284

}

2011

2285

free(fullname);

2012

2286

}

2013

2287

}

2014

2288

2015

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

2016

specify */

2289

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

2017

2290

free(direntries);

2018

if (ret == -1){

2291

if (numentries == -1){

2019

2292

perror_plus("scandir");

2020

2293

}

2021

2294

ret = rmdir(tempdir);