/mandos/trunk : revision 24.1.179

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

88

91

89

#ifdef __linux__

92

90

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

110

108

init_gnutls_session(),

111

109

GNUTLS_* */

112

110

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

115

113

116

114

/* GPGME */

117

115

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

125

123

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

126

124

#define SECKEY "seckey.txt"

127

125

#define PUBKEY "pubkey.txt"

128

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

129

126

130

127

bool debug = false;

131

128

static const char mandos_protocol_version[] = "1";

132

129

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

133

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

130

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

134

131

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

135

132

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

133

138

134

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

139

135

typedef struct server{

174

170

perror(print_text);

175

171

}

176

172

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

186

173

/*

187

174

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

188

175

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

189

176

* "buffer_length" is how much is already used.

190

177

*/

191

178

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

179

size_t buffer_capacity){

193

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

181

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

195

182

if(buffer == NULL){

201

188

}

202

189

203

190

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

204

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

205

int af){

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

206

194

int ret;

207

195

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

208

196

if(new_server == NULL){

210

198

return -1;

211

199

}

212

200

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

216

204

if(new_server->ip == NULL){

217

205

perror_plus("strdup");

218

206

return -1;

240

228

/*

241

229

* Initialize GPGME.

242

230

*/

243

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

244

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

245

233

gpgme_error_t rc;

246

234

gpgme_engine_info_t engine_info;

247

235

262

250

263

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

252

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

253

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

254

gpgme_strsource(rc), gpgme_strerror(rc));

267

255

return false;

268

256

}

269

257

270

258

rc = gpgme_op_import(mc.ctx, pgp_data);

271

259

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

274

262

return false;

275

263

}

276

264

283

271

}

284

272

285

273

if(debug){

286

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

274

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

287

275

}

288

276

289

277

/* Init GPGME */

290

278

gpgme_check_version(NULL);

291

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

280

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

295

283

return false;

296

284

}

297

285

298

286

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

299

287

rc = gpgme_get_engine_info(&engine_info);

300

288

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

303

291

return false;

304

292

}

305

293

while(engine_info != NULL){

311

299

engine_info = engine_info->next;

312

300

}

313

301

if(engine_info == NULL){

314

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

315

tempdir);

302

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

316

303

return false;

317

304

}

318

305

319

306

/* Create new GPGME "context" */

320

307

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

321

308

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

325

311

return false;

326

312

}

327

313

346

332

ssize_t plaintext_length = 0;

347

333

348

334

if(debug){

349

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

335

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

350

336

}

351

337

352

338

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

353

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

340

0);

355

341

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

358

344

return -1;

359

345

}

360

346

361

347

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

362

348

rc = gpgme_data_new(&dh_plain);

363

349

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

367

352

gpgme_data_release(dh_crypto);

368

353

return -1;

369

354

}

372

357

data buffer */

373

358

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

374

359

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

377

362

plaintext_length = -1;

378

363

if(debug){

379

364

gpgme_decrypt_result_t result;

380

365

result = gpgme_op_decrypt_result(mc.ctx);

381

366

if(result == NULL){

382

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

367

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

383

368

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

388

373

if(result->file_name != NULL){

389

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

374

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

390

375

}

391

376

gpgme_recipient_t recipient;

392

377

recipient = result->recipients;

393

378

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

401

385

recipient = recipient->next;

402

386

}

403

387

}

406

390

}

407

391

408

392

if(debug){

409

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

393

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

410

394

}

411

395

412

396

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

419

403

*plaintext = NULL;

420

404

while(true){

421

405

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

424

408

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

428

412

}

429

413

430

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

443

427

}

444

428

445

429

if(debug){

446

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

430

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

447

431

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

448

432

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

449

433

}

471

455

/* GnuTLS log function callback */

472

456

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

473

457

const char* string){

474

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

458

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

475

459

}

476

460

477

461

static int init_gnutls_global(const char *pubkeyfilename,

479

463

int ret;

480

464

481

465

if(debug){

482

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

466

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

483

467

}

484

468

485

469

ret = gnutls_global_init();

486

470

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

489

473

return -1;

490

474

}

491

475

500

484

/* OpenPGP credentials */

501

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

502

486

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

505

489

gnutls_global_deinit();

506

490

return -1;

507

491

}

508

492

509

493

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

494

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

495

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

496

seckeyfilename);

514

497

}

515

498

516

499

ret = gnutls_certificate_set_openpgp_key_file

517

500

(mc.cred, pubkeyfilename, seckeyfilename,

518

501

GNUTLS_OPENPGP_FMT_BASE64);

519

502

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

525

508

goto globalfail;

526

509

}

527

510

528

511

/* GnuTLS server initialization */

529

512

ret = gnutls_dh_params_init(&mc.dh_params);

530

513

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

514

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

515

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

534

516

goto globalfail;

535

517

}

536

518

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

537

519

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

540

522

goto globalfail;

541

523

}

542

524

562

544

}

563

545

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

564

546

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

568

549

}

569

550

570

551

{

577

558

}

578

559

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

579

560

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

583

564

gnutls_deinit(*session);

584

565

return -1;

585

566

}

594

575

}

595

576

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

596

577

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

599

580

gnutls_deinit(*session);

600

581

return -1;

601

582

}

646

627

pf = PF_INET;

647

628

break;

648

629

default:

649

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

630

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

650

631

errno = EINVAL;

651

632

return -1;

652

633

}

657

638

}

658

639

659

640

if(debug){

660

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

661

PRIu16 "\n", ip, port);

641

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

642

"\n", ip, port);

662

643

}

663

644

664

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

671

}

691

672

if(ret == 0){

692

673

int e = errno;

693

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

674

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

694

675

errno = e;

695

676

goto mandos_end;

696

677

}

701

682

702

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

684

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

704

-Wunreachable-code*/

685

-Wunreachable-code*/

705

686

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

708

689

errno = EINVAL;

709

690

goto mandos_end;

710

691

}

728

709

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

729

710

perror_plus("if_indextoname");

730

711

} else {

731

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

732

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

712

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

713

ip, interface, port);

733

714

}

734

715

} else {

735

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

736

ip, port);

716

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

717

port);

737

718

}

738

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

730

perror_plus("inet_ntop");

750

731

} else {

751

732

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

752

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

733

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

753

734

}

754

735

}

755

736

}

783

764

while(true){

784

765

size_t out_size = strlen(out);

785

766

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

786

out_size - written));

767

out_size - written));

787

768

if(ret == -1){

788

769

int e = errno;

789

770

perror_plus("write");

809

790

}

810

791

811

792

if(debug){

812

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

793

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

813

794

}

814

795

815

796

if(quit_now){

835

816

836

817

if(ret != GNUTLS_E_SUCCESS){

837

818

if(debug){

838

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

819

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

839

820

gnutls_perror(ret);

840

821

}

841

822

errno = EPROTO;

845

826

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

846

827

847

828

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

829

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

830

ip);

850

831

}

851

832

852

833

while(true){

857

838

}

858

839

859

840

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

841

buffer_capacity);

861

842

if(buffer_capacity == 0){

862

843

int e = errno;

863

844

perror_plus("incbuffer");

890

871

}

891

872

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

892

873

if(ret < 0){

893

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

894

"***\n");

874

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

895

875

gnutls_perror(ret);

896

876

errno = EPROTO;

897

877

goto mandos_end;

898

878

}

899

879

break;

900

880

default:

901

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

902

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

903

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

884

errno = EIO;

905

885

goto mandos_end;

910

890

}

911

891

912

892

if(debug){

913

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

893

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

914

894

}

915

895

916

896

if(quit_now){

928

908

929

909

if(buffer_length > 0){

930

910

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

932

913

&decrypted_buffer);

933

914

if(decrypted_buffer_size >= 0){

934

915

945

926

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

946

927

int e = errno;

947

928

if(debug){

948

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

949

strerror(errno));

929

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

930

strerror(errno));

950

931

}

951

932

errno = e;

952

933

goto mandos_end;

1009

990

switch(event){

1010

991

default:

1011

992

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1016

996

break;

1017

997

1018

998

case AVAHI_RESOLVER_FOUND:

1020

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1001

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

1022

1002

if(debug){

1023

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

1024

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

1025

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1026

1006

}

1027

1007

int ret = start_mandos_communication(ip, port, interface,

1028

1008

avahi_proto_to_af(proto));

1060

1040

default:

1061

1041

case AVAHI_BROWSER_FAILURE:

1062

1042

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1065

1045

avahi_simple_poll_quit(mc.simple_poll);

1066

1046

return;

1067

1047

1074

1054

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

1075

1055

name, type, domain, protocol, 0,

1076

1056

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1057

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

1058

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

1080

1059

break;

1081

1060

1082

1061

case AVAHI_BROWSER_REMOVE:

1085

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1066

if(debug){

1088

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

1089

" searching...\n");

1067

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

1090

1068

}

1091

1069

break;

1092

1070

}

1107

1085

errno = old_errno;

1108

1086

}

1109

1087

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1121

1144

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1145

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

1146

flagstring, if_entry->d_name);

1123

1147

}

1124

return false;

1148

free(flagstring);

1149

return 0;

1125

1150

}

1126

return true;

1127

}

1128

1129

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

1130

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1131

1153

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1133

1155

if(debug){

1134

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

1135

ifname);

1156

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

1157

if_entry->d_name);

1136

1158

}

1137

return false;

1159

return 0;

1138

1160

}

1139

1161

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

1140

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

1162

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

1141

1163

if(debug){

1142

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

1143

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

1164

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

1165

if_entry->d_name);

1144

1166

}

1145

return true;

1167

return 1;

1146

1168

}

1147

1169

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

1148

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

1170

if(not (flags & IFF_BROADCAST)){

1149

1171

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1172

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

1173

if_entry->d_name);

1152

1174

}

1153

return false;

1175

return 0;

1154

1176

}

1155

1177

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1157

1179

if(debug){

1158

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

1159

ifname);

1180

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

1181

if_entry->d_name);

1160

1182

}

1161

return false;

1183

return 0;

1162

1184

}

1163

1164

1185

/* Accept this device */

1165

1186

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1187

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

1188

if_entry->d_name);

1235

1189

}

1236

1190

return 1;

1237

1191

}

1247

1201

return 1;

1248

1202

}

1249

1203

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

1205

int ret;

1309

1206

struct timespec now;

1313

1210

while(true){

1314

1211

if(mc.current_server == NULL){

1315

1212

if (debug){

1316

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

1317

" No timeout!\n");

1213

fprintf(stderr,

1214

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

1318

1215

}

1319

1216

ret = avahi_simple_poll_iterate(s, -1);

1320

1217

} else {

1321

1218

if (debug){

1322

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

1323

" it, or wait\n");

1219

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

1220

" or wait\n");

1324

1221

}

1325

1222

/* the current time */

1326

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1342

1239

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

1343

1240

1344

1241

if (debug){

1345

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

1346

block_time);

1242

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

1347

1243

}

1348

1244

1349

1245

if(block_time <= 0){

1369

1265

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

1370

1266

}

1371

1267

if(ret != 0){

1372

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

1268

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

1373

1269

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

1374

1270

}

1375

1271

}

1376

1272

}

1377

1273

}

1378

1274

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[i];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

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

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1479

}

1480

1481

1275

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

1482

1276

AvahiSServiceBrowser *sb = NULL;

1483

1277

int error;

1565

1359

.arg = "SECONDS",

1566

1360

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

1567

1361

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

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

1571

.group = 2 },

1572

1362

/*

1573

1363

* These reproduce what we would get without ARGP_NO_HELP

1574

1364

*/

1627

1417

argp_error(state, "Bad retry interval");

1628

1418

}

1629

1419

break;

1630

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

1631

hookdir = arg;

1632

break;

1633

1420

/*

1634

1421

* These reproduce what we would get without ARGP_NO_HELP

1635

1422

*/

1641

1428

argp_state_help(state, state->out_stream,

1642

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1643

1430

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1431

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

1647

1432

exit(argp_err_exit_status);

1648

1433

break;

1649

1434

default:

1673

1458

}

1674

1459

}

1675

1460

1676

if(getuid() == 0){

1461

{

1677

1462

/* Work around Debian bug #633582:

1678

1463

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

1679

1464

struct stat st;

1694

1479

if(ret == -1){

1695

1480

perror_plus("fstat");

1696

1481

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1482

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

1699

1483

ret = fchown(seckey_fd, uid, gid);

1700

1484

if(ret == -1){

1701

1485

perror_plus("fchown");

1715

1499

if(ret == -1){

1716

1500

perror_plus("fstat");

1717

1501

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1502

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

1720

1503

ret = fchown(pubkey_fd, uid, gid);

1721

1504

if(ret == -1){

1722

1505

perror_plus("fchown");

1735

1518

}

1736

1519

}

1737

1520

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

1759

}

1760

1761

1521

if(not debug){

1762

1522

avahi_set_log_function(empty_log);

1763

1523

}

1764

1524

1765

1525

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

1766

1526

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1769

1528

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

1529

if(ret >= 1){

1777

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1778

1531

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

1779

1532

if(debug){

1780

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

1533

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

1781

1534

}

1782

1535

if(interface == NULL){

1783

1536

perror_plus("malloc");

1788

1541

free(direntries);

1789

1542

} else {

1790

1543

free(direntries);

1791

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

1544

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

1792

1545

exitcode = EXIT_FAILURE;

1793

1546

goto end;

1794

1547

}

1800

1553

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

1801

1554

mc.simple_poll = avahi_simple_poll_new();

1802

1555

if(mc.simple_poll == NULL){

1803

fprintf_plus(stderr,

1804

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

1556

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

1805

1557

exitcode = EX_UNAVAILABLE;

1806

1558

goto end;

1807

1559

}

1873

1625

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

1874

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

1627

if(if_index == 0){

1876

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

1628

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

1877

1629

exitcode = EX_UNAVAILABLE;

1878

1630

goto end;

1879

1631

}

1999

1751

#endif /* __linux__ */

2000

1752

/* Lower privileges */

2001

1753

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

2006

1766

}

2007

1767

}

2008

1768

2012

1772

2013

1773

ret = init_gnutls_global(pubkey, seckey);

2014

1774

if(ret == -1){

2015

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

1775

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

2016

1776

exitcode = EX_UNAVAILABLE;

2017

1777

goto end;

2018

1778

} else {

2034

1794

}

2035

1795

2036

1796

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

2037

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

1797

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

2038

1798

exitcode = EX_UNAVAILABLE;

2039

1799

goto end;

2040

1800

} else {

2050

1810

/* (Mainly meant for debugging) */

2051

1811

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

2052

1812

if(address == NULL){

2053

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

1813

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

2054

1814

exitcode = EX_USAGE;

2055

1815

goto end;

2056

1816

}

2064

1824

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

2065

1825

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

2066

1826

or tmpmax != (uint16_t)tmpmax){

2067

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

1827

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

2068

1828

exitcode = EX_USAGE;

2069

1829

goto end;

2070

1830

}

2100

1860

break;

2101

1861

}

2102

1862

if(debug){

2103

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

2104

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2105

1865

}

2106

1866

sleep((int)retry_interval);

2107

1867

}

2109

1869

if (not quit_now){

2110

1870

exitcode = EXIT_SUCCESS;

2111

1871

}

2112

1872

2113

1873

goto end;

2114

1874

}

2115

1875

2137

1897

2138

1898

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

2139

1899

if(mc.server == NULL){

2140

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

2141

avahi_strerror(error));

1900

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

1901

avahi_strerror(error));

2142

1902

exitcode = EX_UNAVAILABLE;

2143

1903

goto end;

2144

1904

}

2152

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2153

1913

NULL, 0, browse_callback, NULL);

2154

1914

if(sb == NULL){

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2157

1917

exitcode = EX_UNAVAILABLE;

2158

1918

goto end;

2159

1919

}

2165

1925

/* Run the main loop */

2166

1926

2167

1927

if(debug){

2168

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

1928

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

2169

1929

}

2170

1930

2171

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

1932

(int)(retry_interval * 1000));

2173

1933

if(debug){

2174

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

2175

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

1934

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

1935

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

2176

1936

}

2177

1937

2178

1938

end:

2179

1939

2180

1940

if(debug){

2181

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

1941

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

2182

1942

}

2183

1943

2184

1944

/* Cleanup things */

2212

1972

}

2213

1973

}

2214

1974

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

2231

1984

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

2232

1985

if(ret == -1){

2233

1986

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2235

1988

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

2236

1989

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

2237

1990

if(ret == -1){

2242

1995

if(ret == -1){

2243

1996

perror_plus("close");

2244

1997

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2253

2004

}

2254

2005

}

2255

2006

2271

2022

}

2272

2023

ret = remove(fullname);

2273

2024

if(ret == -1){

2274

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

2275

strerror(errno));

2025

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

2026

strerror(errno));

2276

2027

}

2277

2028

free(fullname);

2278

2029

}