/mandos/release : revision 237.7.79

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

bool 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){

196

210

perror_plus("malloc");

197

return -1;

211

return false;

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

return -1;

219

return false;

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;

219

233

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

220

234

if(ret == -1){

221

235

perror_plus("clock_gettime");

222

return -1;

236

return false;

223

237

}

224

return 0;

238

return true;

225

239

}

226

240

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));

1008

1030

if(ret == 0){

1009

1031

avahi_simple_poll_quit(mc.simple_poll);

1010

1032

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

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

1036

" list\n", name);

1037

}

1013

1038

}

1014

1039

}

1015

1040

}

1039

1064

default:

1040

1065

case AVAHI_BROWSER_FAILURE:

1041

1066

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1067

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

1044

1069

avahi_simple_poll_quit(mc.simple_poll);

1045

1070

return;

1046

1071

1053

1078

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

1054

1079

name, type, domain, protocol, 0,

1055

1080

resolve_callback, NULL) == NULL)

1056

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

1057

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

1081

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

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

1058

1084

break;

1059

1085

1060

1086

case AVAHI_BROWSER_REMOVE:

1063

1089

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1090

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1091

if(debug){

1066

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

1092

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

1093

" searching...\n");

1067

1094

}

1068

1095

break;

1069

1096

}

1084

1111

errno = old_errno;

1085

1112

}

1086

1113

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){

1114

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

1115

int ret;

1116

1117

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

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1143

1125

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1126

perror_plus("ioctl SIOCGIFFLAGS");

1146

1127

}

1147

free(flagstring);

1148

return 0;

1128

return false;

1149

1129

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1130

return true;

1131

}

1132

1133

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

1134

1152

1135

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1137

if(debug){

1155

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

1156

if_entry->d_name);

1138

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

1139

ifname);

1157

1140

}

1158

return 0;

1141

return false;

1159

1142

}

1160

1143

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

1161

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

1144

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

1162

1145

if(debug){

1163

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

1164

if_entry->d_name);

1146

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

1147

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

1165

1148

}

1166

return 1;

1149

return true;

1167

1150

}

1168

1151

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

1169

if(not (flags & IFF_BROADCAST)){

1152

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

1170

1153

if(debug){

1171

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

1172

if_entry->d_name);

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

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

1173

1156

}

1174

return 0;

1157

return false;

1175

1158

}

1176

1159

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

1177

if(flags & IFF_NOARP){

1160

if(ifr->ifr_flags & IFF_NOARP){

1178

1161

if(debug){

1179

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

1180

if_entry->d_name);

1162

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

1163

ifname);

1181

1164

}

1182

return 0;

1165

return false;

1183

1166

}

1167

1184

1168

/* Accept this device */

1185

1169

if(debug){

1186

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

1187

if_entry->d_name);

1170

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

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

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

1177

* corresponds to an acceptable network device.

1178

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

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

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

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

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

1187

if(debug){

1188

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

1189

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

1190

}

1191

return 0;

1192

}

1193

1194

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

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1188

1239

}

1189

1240

return 1;

1190

1241

}

1200

1251

return 1;

1201

1252

}

1202

1253

1254

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

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

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

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

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

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

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

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

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

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

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

1293

/* Not a regular file */

1294

if(debug){

1295

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

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not executable */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1203

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1316

int ret;

1205

1317

struct timespec now;

1206

1318

struct timespec waited_time;

1207

1319

intmax_t block_time;

1208

1320

1209

1321

while(true){

1210

1322

if(mc.current_server == NULL){

1211

1323

if (debug){

1212

fprintf(stderr,

1213

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

1324

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

1325

" No timeout!\n");

1214

1326

}

1215

1327

ret = avahi_simple_poll_iterate(s, -1);

1216

1328

} else {

1217

1329

if (debug){

1218

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

1219

" or wait\n");

1330

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

1331

" it, or wait\n");

1220

1332

}

1221

1333

/* the current time */

1222

1334

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1236

1348

block_time = ((retry_interval

1237

1349

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

1238

1350

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

1239

1351

1240

1352

if (debug){

1241

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

1353

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

1354

block_time);

1242

1355

}

1243

1356

1244

1357

if(block_time <= 0){

1245

1358

ret = start_mandos_communication(mc.current_server->ip,

1246

1359

mc.current_server->port,

1264

1377

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

1265

1378

}

1266

1379

if(ret != 0){

1267

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

1380

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

1268

1381

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

1269

1382

}

1270

1383

}

1271

1384

}

1272

1385

}

1273

1386

1387

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

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1512

}

1513

1274

1514

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

1275

1515

AvahiSServiceBrowser *sb = NULL;

1276

1516

int error;

1358

1598

.arg = "SECONDS",

1359

1599

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

1360

1600

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

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

1604

.group = 2 },

1361

1605

/*

1362

1606

* These reproduce what we would get without ARGP_NO_HELP

1363

1607

*/

1411

1655

errno = 0;

1412

1656

retry_interval = strtod(arg, &tmp);

1413

1657

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

1414

or (retry_interval * 1000) > INT_MAX){

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1415

1660

argp_error(state, "Bad retry interval");

1416

1661

}

1417

1662

break;

1663

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

1664

hookdir = arg;

1665

break;

1418

1666

/*

1419

1667

* These reproduce what we would get without ARGP_NO_HELP

1420

1668

*/

1426

1674

argp_state_help(state, state->out_stream,

1427

1675

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

1676

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

1429

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

1677

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

1430

1678

exit(argp_err_exit_status);

1431

1679

break;

1432

1680

default:

1459

1707

{

1460

1708

/* Work around Debian bug #633582:

1461

1709

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

1462

struct stat st;

1463

1710

1464

1711

/* Re-raise priviliges */

1465

1712

errno = 0;

1466

1713

ret = seteuid(0);

1467

1714

if(ret == -1){

1468

1715

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

}

1716

} else {

1717

struct stat st;

1718

1719

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

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

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

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode)

1750

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

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

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

1772

goto end;

1513

1773

}

1514

1774

1515

1775

if(not debug){

1516

1776

avahi_set_log_function(empty_log);

1517

1777

}

1518

1778

1519

1779

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

1520

1780

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1522

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1523

1790

if(ret >= 1){

1524

/* Pick the first good interface */

1791

/* Pick the first interface returned */

1525

1792

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

1526

1793

if(debug){

1527

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

1794

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

1528

1795

}

1529

1796

if(interface == NULL){

1530

1797

perror_plus("malloc");

1535

1802

free(direntries);

1536

1803

} else {

1537

1804

free(direntries);

1538

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

1805

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

1539

1806

exitcode = EXIT_FAILURE;

1540

1807

goto end;

1541

1808

}

1547

1814

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

1548

1815

mc.simple_poll = avahi_simple_poll_new();

1549

1816

if(mc.simple_poll == NULL){

1550

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

1817

fprintf_plus(stderr,

1818

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

1551

1819

exitcode = EX_UNAVAILABLE;

1552

1820

goto end;

1553

1821

}

1619

1887

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

1620

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1889

if(if_index == 0){

1622

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

1890

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

1623

1891

exitcode = EX_UNAVAILABLE;

1624

1892

goto end;

1625

1893

}

1745

2013

#endif /* __linux__ */

1746

2014

/* Lower privileges */

1747

2015

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

}

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

1760

2020

}

1761

2021

}

1762

2022

1766

2026

1767

2027

ret = init_gnutls_global(pubkey, seckey);

1768

2028

if(ret == -1){

1769

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

2029

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

1770

2030

exitcode = EX_UNAVAILABLE;

1771

2031

goto end;

1772

2032

} else {

1788

2048

}

1789

2049

1790

2050

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

1791

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

2051

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

1792

2052

exitcode = EX_UNAVAILABLE;

1793

2053

goto end;

1794

2054

} else {

1804

2064

/* (Mainly meant for debugging) */

1805

2065

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

1806

2066

if(address == NULL){

1807

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

2067

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

1808

2068

exitcode = EX_USAGE;

1809

2069

goto end;

1810

2070

}

1818

2078

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

1819

2079

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

1820

2080

or tmpmax != (uint16_t)tmpmax){

1821

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

2081

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

1822

2082

exitcode = EX_USAGE;

1823

2083

goto end;

1824

2084

}

1829

2089

1830

2090

port = (uint16_t)tmpmax;

1831

2091

*address = '\0';

1832

address = connect_to;

1833

2092

/* Colon in address indicates IPv6 */

1834

2093

int af;

1835

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

2094

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

1836

2095

af = AF_INET6;

2096

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

2097

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

2098

{

2099

connect_to++;

2100

address[-1] = '\0';

2101

}

1837

2102

} else {

1838

2103

af = AF_INET;

1839

2104

}

2105

address = connect_to;

1840

2106

1841

2107

if(quit_now){

1842

2108

goto end;

1843

2109

}

1844

2110

1845

2111

while(not quit_now){

1846

2112

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

1847

2113

if(quit_now or ret == 0){

1848

2114

break;

1849

2115

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

2116

if(debug){

2117

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

2118

(int)retry_interval);

2119

}

2120

sleep((int)retry_interval);

2121

}

2122

1853

2123

if (not quit_now){

1854

2124

exitcode = EXIT_SUCCESS;

1855

2125

}

1856

2126

1857

2127

goto end;

1858

2128

}

1859

2129

1881

2151

1882

2152

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

1883

2153

if(mc.server == NULL){

1884

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

1885

avahi_strerror(error));

2154

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

2155

avahi_strerror(error));

1886

2156

exitcode = EX_UNAVAILABLE;

1887

2157

goto end;

1888

2158

}

1896

2166

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1897

2167

NULL, 0, browse_callback, NULL);

1898

2168

if(sb == NULL){

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

1901

2171

exitcode = EX_UNAVAILABLE;

1902

2172

goto end;

1903

2173

}

1909

2179

/* Run the main loop */

1910

2180

1911

2181

if(debug){

1912

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

2182

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

1913

2183

}

1914

2184

1915

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

2186

(int)(retry_interval * 1000));

1917

2187

if(debug){

1918

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

1919

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

2188

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

2189

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

1920

2190

}

1921

2191

1922

2192

end:

1923

2193

1924

2194

if(debug){

1925

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

2195

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

1926

2196

}

1927

2197

1928

2198

/* Cleanup things */

1944

2214

if(gpgme_initialized){

1945

2215

gpgme_release(mc.ctx);

1946

2216

}

1947

2217

1948

2218

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

1949

2219

has seen */

1950

2220

if(mc.current_server != NULL){

1956

2226

}

1957

2227

}

1958

2228

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

1962

2234

errno = 0;

1963

2235

ret = seteuid(0);

1964

2236

if(ret == -1){

1965

2237

perror_plus("seteuid");

1966

2238

}

1967

if(geteuid() == 0){

2239

2240

/* Take down the network interface */

2241

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

1968

2242

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

1969

2243

if(ret == -1){

1970

2244

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

2245

} else if(network.ifr_flags & IFF_UP){

1972

2246

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

1973

2247

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

1974

2248

if(ret == -1){

1979

2253

if(ret == -1){

1980

2254

perror_plus("close");

1981

2255

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

1988

2256

}

1989

2257

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

1990

2264

1991

2265

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

1992

2266

if(tempdir_created){

1993

2267

struct dirent **direntries = NULL;

1994

2268

struct dirent *direntry = NULL;

1995

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

1996

if (ret > 0){

1997

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

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

1998

2273

direntry = direntries[i];

1999

2274

char *fullname = NULL;

2000

2275

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

2005

2280

}

2006

2281

ret = remove(fullname);

2007

2282

if(ret == -1){

2008

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

2009

strerror(errno));

2283

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

2284

strerror(errno));

2010

2285

}

2011

2286

free(fullname);

2012

2287

}

2013

2288

}

2014

2289

2015

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

2016

specify */

2290

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

2017

2291

free(direntries);

2018

if (ret == -1){

2292

if (numentries == -1){

2019

2293

perror_plus("scandir");

2020

2294

}

2021

2295

ret = rmdir(tempdir);