/mandos/release : revision 237.16.17

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){

188

202

}

189

203

190

204

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

205

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

206

int af){

194

207

int ret;

195

208

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

196

209

if(new_server == NULL){

198

211

return -1;

199

212

}

200

213

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

214

.port = port,

215

.if_index = if_index,

216

.af = af };

204

217

if(new_server->ip == NULL){

205

218

perror_plus("strdup");

206

219

return -1;

228

241

/*

229

242

* Initialize GPGME.

230

243

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

233

246

gpgme_error_t rc;

234

247

gpgme_engine_info_t engine_info;

235

248

250

263

251

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

265

if(rc != GPG_ERR_NO_ERROR){

253

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

254

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));

255

268

return false;

256

269

}

257

270

258

271

rc = gpgme_op_import(mc.ctx, pgp_data);

259

272

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

262

275

return false;

263

276

}

264

277

271

284

}

272

285

273

286

if(debug){

274

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

287

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

275

288

}

276

289

277

290

/* Init GPGME */

278

291

gpgme_check_version(NULL);

279

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

293

if(rc != GPG_ERR_NO_ERROR){

281

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

282

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));

283

296

return false;

284

297

}

285

298

286

299

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

287

300

rc = gpgme_get_engine_info(&engine_info);

288

301

if(rc != GPG_ERR_NO_ERROR){

289

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

290

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));

291

304

return false;

292

305

}

293

306

while(engine_info != NULL){

299

312

engine_info = engine_info->next;

300

313

}

301

314

if(engine_info == NULL){

302

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);

303

317

return false;

304

318

}

305

319

306

320

/* Create new GPGME "context" */

307

321

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

308

322

if(rc != GPG_ERR_NO_ERROR){

309

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

310

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));

311

326

return false;

312

327

}

313

328

332

347

ssize_t plaintext_length = 0;

333

348

334

349

if(debug){

335

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

350

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

336

351

}

337

352

338

353

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

339

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

355

0);

341

356

if(rc != GPG_ERR_NO_ERROR){

342

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

343

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));

344

359

return -1;

345

360

}

346

361

347

362

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

348

363

rc = gpgme_data_new(&dh_plain);

349

364

if(rc != GPG_ERR_NO_ERROR){

350

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

351

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));

352

368

gpgme_data_release(dh_crypto);

353

369

return -1;

354

370

}

357

373

data buffer */

358

374

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

359

375

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

362

378

plaintext_length = -1;

363

379

if(debug){

364

380

gpgme_decrypt_result_t result;

365

381

result = gpgme_op_decrypt_result(mc.ctx);

366

382

if(result == NULL){

367

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

383

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

368

384

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

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);

373

389

if(result->file_name != NULL){

374

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

390

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

375

391

}

376

392

gpgme_recipient_t recipient;

377

393

recipient = result->recipients;

378

394

while(recipient != NULL){

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");

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");

385

402

recipient = recipient->next;

386

403

}

387

404

}

390

407

}

391

408

392

409

if(debug){

393

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

410

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

394

411

}

395

412

396

413

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

403

420

*plaintext = NULL;

404

421

while(true){

405

422

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

408

425

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

412

429

}

413

430

414

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

444

}

428

445

429

446

if(debug){

430

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

447

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

431

448

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

432

449

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

433

450

}

455

472

/* GnuTLS log function callback */

456

473

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

457

474

const char* string){

458

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

475

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

459

476

}

460

477

461

478

static int init_gnutls_global(const char *pubkeyfilename,

463

480

int ret;

464

481

465

482

if(debug){

466

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

483

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

467

484

}

468

485

469

486

ret = gnutls_global_init();

470

487

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

473

490

return -1;

474

491

}

475

492

484

501

/* OpenPGP credentials */

485

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

503

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

489

506

gnutls_global_deinit();

490

507

return -1;

491

508

}

492

509

493

510

if(debug){

494

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

495

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

496

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);

497

515

}

498

516

499

517

ret = gnutls_certificate_set_openpgp_key_file

500

518

(mc.cred, pubkeyfilename, seckeyfilename,

501

519

GNUTLS_OPENPGP_FMT_BASE64);

502

520

if(ret != GNUTLS_E_SUCCESS){

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));

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));

508

526

goto globalfail;

509

527

}

510

528

511

529

/* GnuTLS server initialization */

512

530

ret = gnutls_dh_params_init(&mc.dh_params);

513

531

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

516

535

goto globalfail;

517

536

}

518

537

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

519

538

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

522

541

goto globalfail;

523

542

}

524

543

544

563

}

545

564

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

546

565

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

549

569

}

550

570

551

571

{

558

578

}

559

579

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

560

580

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

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));

564

584

gnutls_deinit(*session);

565

585

return -1;

566

586

}

575

595

}

576

596

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

577

597

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

580

600

gnutls_deinit(*session);

581

601

return -1;

582

602

}

627

647

pf = PF_INET;

628

648

break;

629

649

default:

630

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

650

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

631

651

errno = EINVAL;

632

652

return -1;

633

653

}

638

658

}

639

659

640

660

if(debug){

641

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

642

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

643

663

}

644

664

645

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

671

691

}

672

692

if(ret == 0){

673

693

int e = errno;

674

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

694

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

675

695

errno = e;

676

696

goto mandos_end;

677

697

}

682

702

683

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

704

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

685

-Wunreachable-code*/

705

-Wunreachable-code*/

686

706

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

689

709

errno = EINVAL;

690

710

goto mandos_end;

691

711

}

709

729

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

710

730

perror_plus("if_indextoname");

711

731

} else {

712

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

713

ip, interface, port);

732

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

733

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

714

734

}

715

735

} else {

716

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

717

port);

736

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

737

ip, port);

718

738

}

719

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

750

perror_plus("inet_ntop");

731

751

} else {

732

752

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

733

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

753

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

734

754

}

735

755

}

736

756

}

764

784

while(true){

765

785

size_t out_size = strlen(out);

766

786

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

767

out_size - written));

787

out_size - written));

768

788

if(ret == -1){

769

789

int e = errno;

770

790

perror_plus("write");

790

810

}

791

811

792

812

if(debug){

793

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

813

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

794

814

}

795

815

796

816

if(quit_now){

816

836

817

837

if(ret != GNUTLS_E_SUCCESS){

818

838

if(debug){

819

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

839

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

820

840

gnutls_perror(ret);

821

841

}

822

842

errno = EPROTO;

826

846

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

827

847

828

848

if(debug){

829

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

830

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

831

851

}

832

852

833

853

while(true){

838

858

}

839

859

840

860

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

861

buffer_capacity);

842

862

if(buffer_capacity == 0){

843

863

int e = errno;

844

864

perror_plus("incbuffer");

871

891

}

872

892

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

873

893

if(ret < 0){

874

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

894

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

895

"***\n");

875

896

gnutls_perror(ret);

876

897

errno = EPROTO;

877

898

goto mandos_end;

878

899

}

879

900

break;

880

901

default:

881

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

882

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

883

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

905

errno = EIO;

885

906

goto mandos_end;

890

911

}

891

912

892

913

if(debug){

893

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

914

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

894

915

}

895

916

896

917

if(quit_now){

908

929

909

930

if(buffer_length > 0){

910

931

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

933

&decrypted_buffer);

914

934

if(decrypted_buffer_size >= 0){

915

935

926

946

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

927

947

int e = errno;

928

948

if(debug){

929

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

930

strerror(errno));

949

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

950

strerror(errno));

931

951

}

932

952

errno = e;

933

953

goto mandos_end;

990

1010

switch(event){

991

1011

default:

992

1012

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

996

1017

break;

997

1018

998

1019

case AVAHI_RESOLVER_FOUND:

1000

1021

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1022

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

1002

1023

if(debug){

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);

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);

1006

1027

}

1007

1028

int ret = start_mandos_communication(ip, port, interface,

1008

1029

avahi_proto_to_af(proto));

1040

1061

default:

1041

1062

case AVAHI_BROWSER_FAILURE:

1042

1063

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1045

1066

avahi_simple_poll_quit(mc.simple_poll);

1046

1067

return;

1047

1068

1054

1075

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

1055

1076

name, type, domain, protocol, 0,

1056

1077

resolve_callback, NULL) == NULL)

1057

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

1058

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1059

1081

break;

1060

1082

1061

1083

case AVAHI_BROWSER_REMOVE:

1064

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1088

if(debug){

1067

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

1089

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

1090

" searching...\n");

1068

1091

}

1069

1092

break;

1070

1093

}

1085

1108

errno = old_errno;

1086

1109

}

1087

1110

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){

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1144

1122

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1123

perror_plus("ioctl SIOCGIFFLAGS");

1147

1124

}

1148

free(flagstring);

1149

return 0;

1125

return false;

1150

1126

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1127

return true;

1128

}

1129

1130

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

1131

1153

1132

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1134

if(debug){

1156

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

1157

if_entry->d_name);

1135

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

1136

ifname);

1158

1137

}

1159

return 0;

1138

return false;

1160

1139

}

1161

1140

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

1162

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

1141

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

1163

1142

if(debug){

1164

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

1165

if_entry->d_name);

1143

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

1144

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

1166

1145

}

1167

return 1;

1146

return true;

1168

1147

}

1169

1148

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

1170

if(not (flags & IFF_BROADCAST)){

1149

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

1171

1150

if(debug){

1172

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

1173

if_entry->d_name);

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1174

1153

}

1175

return 0;

1154

return false;

1176

1155

}

1177

1156

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

1178

if(flags & IFF_NOARP){

1157

if(ifr->ifr_flags & IFF_NOARP){

1179

1158

if(debug){

1180

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

1181

if_entry->d_name);

1159

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

1160

ifname);

1182

1161

}

1183

return 0;

1162

return false;

1184

1163

}

1164

1185

1165

/* Accept this device */

1186

1166

if(debug){

1187

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

1188

if_entry->d_name);

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1189

1236

}

1190

1237

return 1;

1191

1238

}

1201

1248

return 1;

1202

1249

}

1203

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1204

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1313

int ret;

1206

1314

struct timespec now;

1210

1318

while(true){

1211

1319

if(mc.current_server == NULL){

1212

1320

if (debug){

1213

fprintf(stderr,

1214

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

1321

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

1322

" No timeout!\n");

1215

1323

}

1216

1324

ret = avahi_simple_poll_iterate(s, -1);

1217

1325

} else {

1218

1326

if (debug){

1219

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

1220

" or wait\n");

1327

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

1328

" it, or wait\n");

1221

1329

}

1222

1330

/* the current time */

1223

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1239

1347

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

1240

1348

1241

1349

if (debug){

1242

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

1350

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

1351

block_time);

1243

1352

}

1244

1353

1245

1354

if(block_time <= 0){

1265

1374

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

1266

1375

}

1267

1376

if(ret != 0){

1268

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

1377

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

1269

1378

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

1270

1379

}

1271

1380

}

1272

1381

}

1273

1382

}

1274

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

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

1435

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

1436

dup2(devnull, STDIN_FILENO);

1437

close(devnull);

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1439

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

1440

if(ret == -1){

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1444

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

1445

if(ret == -1){

1446

perror_plus("setenv");

1447

_exit(EX_OSERR);

1448

}

1449

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

1450

if(ret == -1){

1451

perror_plus("setenv");

1452

_exit(EX_OSERR);

1453

}

1454

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

1455

if(ret == -1){

1456

perror_plus("setenv");

1457

_exit(EX_OSERR);

1458

}

1459

char *delaystring;

1460

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

1461

if(ret == -1){

1462

perror_plus("asprintf");

1463

_exit(EX_OSERR);

1464

}

1465

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

1466

if(ret == -1){

1467

free(delaystring);

1468

perror_plus("setenv");

1469

_exit(EX_OSERR);

1470

}

1471

free(delaystring);

1472

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

1473

perror_plus("execl");

1474

} else {

1475

int status;

1476

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

1477

perror_plus("waitpid");

1478

free(fullname);

1479

continue;

1480

}

1481

if(WIFEXITED(status)){

1482

if(WEXITSTATUS(status) != 0){

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

WTERMSIG(status));

1493

free(fullname);

1494

continue;

1495

} else {

1496

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

1497

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

1498

free(fullname);

1499

continue;

1500

}

1501

}

1502

free(fullname);

1503

if(debug){

1504

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

1505

direntry->d_name);

1506

}

1507

}

1508

close(devnull);

1509

}

1510

return true;

1511

}

1512

1275

1513

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

1276

1514

AvahiSServiceBrowser *sb = NULL;

1277

1515

int error;

1359

1597

.arg = "SECONDS",

1360

1598

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

1361

1599

.group = 2 },

1600

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

1601

.arg = "DIR",

1602

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

1603

.group = 2 },

1362

1604

/*

1363

1605

* These reproduce what we would get without ARGP_NO_HELP

1364

1606

*/

1417

1659

argp_error(state, "Bad retry interval");

1418

1660

}

1419

1661

break;

1662

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

1663

hookdir = arg;

1664

break;

1420

1665

/*

1421

1666

* These reproduce what we would get without ARGP_NO_HELP

1422

1667

*/

1428

1673

argp_state_help(state, state->out_stream,

1429

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1675

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

1431

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1678

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

1432

1679

exit(argp_err_exit_status);

1433

1680

break;

1434

1681

default:

1461

1708

{

1462

1709

/* Work around Debian bug #633582:

1463

1710

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

1464

struct stat st;

1465

1711

1466

1712

/* Re-raise priviliges */

1467

1713

errno = 0;

1468

1714

ret = seteuid(0);

1469

1715

if(ret == -1){

1470

1716

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

1717

} else {

1718

struct stat st;

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

if(S_ISREG(st.st_mode)

1730

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

1731

ret = fchown(seckey_fd, uid, gid);

1732

if(ret == -1){

1733

perror_plus("fchown");

1734

}

1735

}

1736

}

1737

TEMP_FAILURE_RETRY(close(seckey_fd));

1738

}

1739

}

1740

1741

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

1742

int pubkey_fd = open(pubkey, O_RDONLY);

1743

if(pubkey_fd == -1){

1744

perror_plus("open");

1745

} else {

1746

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

1747

if(ret == -1){

1748

perror_plus("fstat");

1749

} else {

1750

if(S_ISREG(st.st_mode)

1751

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

1752

ret = fchown(pubkey_fd, uid, gid);

1753

if(ret == -1){

1754

perror_plus("fchown");

1755

}

1756

}

1757

}

1758

TEMP_FAILURE_RETRY(close(pubkey_fd));

1759

}

1760

}

1761

1762

/* Lower privileges */

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

1767

}

1768

}

1769

}

1770

1771

/* Run network hooks */

1772

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

1773

goto end;

1519

1774

}

1520

1775

1521

1776

if(not debug){

1522

1777

avahi_set_log_function(empty_log);

1523

1778

}

1524

1779

1525

1780

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

1526

1781

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1784

alphasort);

1785

if(ret == 0){

1786

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

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1529

1791

if(ret >= 1){

1530

/* Pick the first good interface */

1792

/* Pick the first interface returned */

1531

1793

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

1532

1794

if(debug){

1533

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

1795

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

1534

1796

}

1535

1797

if(interface == NULL){

1536

1798

perror_plus("malloc");

1541

1803

free(direntries);

1542

1804

} else {

1543

1805

free(direntries);

1544

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

1806

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

1545

1807

exitcode = EXIT_FAILURE;

1546

1808

goto end;

1547

1809

}

1553

1815

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

1554

1816

mc.simple_poll = avahi_simple_poll_new();

1555

1817

if(mc.simple_poll == NULL){

1556

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

1818

fprintf_plus(stderr,

1819

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

1557

1820

exitcode = EX_UNAVAILABLE;

1558

1821

goto end;

1559

1822

}

1625

1888

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

1626

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1890

if(if_index == 0){

1628

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

1891

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

1629

1892

exitcode = EX_UNAVAILABLE;

1630

1893

goto end;

1631

1894

}

1751

2014

#endif /* __linux__ */

1752

2015

/* Lower privileges */

1753

2016

errno = 0;

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

}

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

1766

2021

}

1767

2022

}

1768

2023

1772

2027

1773

2028

ret = init_gnutls_global(pubkey, seckey);

1774

2029

if(ret == -1){

1775

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

2030

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

1776

2031

exitcode = EX_UNAVAILABLE;

1777

2032

goto end;

1778

2033

} else {

1794

2049

}

1795

2050

1796

2051

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

1797

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

2052

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

1798

2053

exitcode = EX_UNAVAILABLE;

1799

2054

goto end;

1800

2055

} else {

1810

2065

/* (Mainly meant for debugging) */

1811

2066

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

1812

2067

if(address == NULL){

1813

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

2068

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

1814

2069

exitcode = EX_USAGE;

1815

2070

goto end;

1816

2071

}

1824

2079

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

1825

2080

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

1826

2081

or tmpmax != (uint16_t)tmpmax){

1827

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

2082

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

1828

2083

exitcode = EX_USAGE;

1829

2084

goto end;

1830

2085

}

1860

2115

break;

1861

2116

}

1862

2117

if(debug){

1863

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

1864

(int)retry_interval);

2118

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

2119

(int)retry_interval);

1865

2120

}

1866

2121

sleep((int)retry_interval);

1867

2122

}

1869

2124

if (not quit_now){

1870

2125

exitcode = EXIT_SUCCESS;

1871

2126

}

1872

2127

1873

2128

goto end;

1874

2129

}

1875

2130

1897

2152

1898

2153

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

1899

2154

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2155

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

2156

avahi_strerror(error));

1902

2157

exitcode = EX_UNAVAILABLE;

1903

2158

goto end;

1904

2159

}

1912

2167

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2168

NULL, 0, browse_callback, NULL);

1914

2169

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2170

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

2171

avahi_strerror(avahi_server_errno(mc.server)));

1917

2172

exitcode = EX_UNAVAILABLE;

1918

2173

goto end;

1919

2174

}

1925

2180

/* Run the main loop */

1926

2181

1927

2182

if(debug){

1928

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

2183

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

1929

2184

}

1930

2185

1931

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2187

(int)(retry_interval * 1000));

1933

2188

if(debug){

1934

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

1935

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

2189

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

2190

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

1936

2191

}

1937

2192

1938

2193

end:

1939

2194

1940

2195

if(debug){

1941

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

2196

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

1942

2197

}

1943

2198

1944

2199

/* Cleanup things */

1960

2215

if(gpgme_initialized){

1961

2216

gpgme_release(mc.ctx);

1962

2217

}

1963

2218

1964

2219

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

1965

2220

has seen */

1966

2221

if(mc.current_server != NULL){

1972

2227

}

1973

2228

}

1974

2229

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Re-raise priviliges */

2234

{

1978

2235

errno = 0;

1979

2236

ret = seteuid(0);

1980

2237

if(ret == -1){

1981

2238

perror_plus("seteuid");

1982

2239

}

1983

if(geteuid() == 0){

2240

2241

/* Take down the network interface */

2242

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

1984

2243

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

1985

2244

if(ret == -1){

1986

2245

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2246

} else if(network.ifr_flags & IFF_UP){

1988

2247

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

1989

2248

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

1990

2249

if(ret == -1){

1995

2254

if(ret == -1){

1996

2255

perror_plus("close");

1997

2256

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2004

2257

}

2005

2258

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2006

2265

2007

2266

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

2008

2267

if(tempdir_created){

2022

2281

}

2023

2282

ret = remove(fullname);

2024

2283

if(ret == -1){

2025

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

2026

strerror(errno));

2284

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

2285

strerror(errno));

2027

2286

}

2028

2287

free(fullname);

2029

2288

}