/mandos/trunk : revision 24.1.186

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: ", program_invocation_short_name));

182

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

183

}

184

185

173

/*

186

174

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

187

175

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

188

176

* "buffer_length" is how much is already used.

189

177

*/

190

178

size_t incbuffer(char **buffer, size_t buffer_length,

191

size_t buffer_capacity){

179

size_t buffer_capacity){

192

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

193

181

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

194

182

if(buffer == NULL){

200

188

}

201

189

202

190

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

203

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

204

int af){

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

205

194

int ret;

206

195

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

207

196

if(new_server == NULL){

209

198

return -1;

210

199

}

211

200

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

212

.port = port,

213

.if_index = if_index,

214

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

215

204

if(new_server->ip == NULL){

216

205

perror_plus("strdup");

217

206

return -1;

239

228

/*

240

229

* Initialize GPGME.

241

230

*/

242

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

243

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

244

233

gpgme_error_t rc;

245

234

gpgme_engine_info_t engine_info;

246

235

261

250

262

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

263

252

if(rc != GPG_ERR_NO_ERROR){

264

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

253

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

265

254

gpgme_strsource(rc), gpgme_strerror(rc));

266

255

return false;

267

256

}

268

257

269

258

rc = gpgme_op_import(mc.ctx, pgp_data);

270

259

if(rc != GPG_ERR_NO_ERROR){

271

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

260

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

272

261

gpgme_strsource(rc), gpgme_strerror(rc));

273

262

return false;

274

263

}

282

271

}

283

272

284

273

if(debug){

285

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

274

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

286

275

}

287

276

288

277

/* Init GPGME */

289

278

gpgme_check_version(NULL);

290

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

291

280

if(rc != GPG_ERR_NO_ERROR){

292

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

281

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

293

282

gpgme_strsource(rc), gpgme_strerror(rc));

294

283

return false;

295

284

}

297

286

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

298

287

rc = gpgme_get_engine_info(&engine_info);

299

288

if(rc != GPG_ERR_NO_ERROR){

300

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

289

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

301

290

gpgme_strsource(rc), gpgme_strerror(rc));

302

291

return false;

303

292

}

310

299

engine_info = engine_info->next;

311

300

}

312

301

if(engine_info == NULL){

313

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

302

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

314

303

return false;

315

304

}

316

305

317

306

/* Create new GPGME "context" */

318

307

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

319

308

if(rc != GPG_ERR_NO_ERROR){

320

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

321

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

322

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

323

311

return false;

324

312

}

325

313

344

332

ssize_t plaintext_length = 0;

345

333

346

334

if(debug){

347

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

335

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

348

336

}

349

337

350

338

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

351

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

340

0);

353

341

if(rc != GPG_ERR_NO_ERROR){

354

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

342

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

355

343

gpgme_strsource(rc), gpgme_strerror(rc));

356

344

return -1;

357

345

}

359

347

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

360

348

rc = gpgme_data_new(&dh_plain);

361

349

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

350

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

364

351

gpgme_strsource(rc), gpgme_strerror(rc));

365

352

gpgme_data_release(dh_crypto);

366

353

return -1;

370

357

data buffer */

371

358

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

372

359

if(rc != GPG_ERR_NO_ERROR){

373

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

360

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

374

361

gpgme_strsource(rc), gpgme_strerror(rc));

375

362

plaintext_length = -1;

376

363

if(debug){

377

364

gpgme_decrypt_result_t result;

378

365

result = gpgme_op_decrypt_result(mc.ctx);

379

366

if(result == NULL){

380

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

367

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

381

368

} else {

382

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

369

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

383

370

result->unsupported_algorithm);

384

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

371

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

385

372

result->wrong_key_usage);

386

373

if(result->file_name != NULL){

387

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

374

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

388

375

}

389

376

gpgme_recipient_t recipient;

390

377

recipient = result->recipients;

391

378

while(recipient != NULL){

392

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

379

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

393

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

394

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

395

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

381

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

382

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

396

383

recipient->status == GPG_ERR_NO_SECKEY

397

384

? "No" : "Yes");

398

385

recipient = recipient->next;

403

390

}

404

391

405

392

if(debug){

406

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

393

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

407

394

}

408

395

409

396

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

416

403

*plaintext = NULL;

417

404

while(true){

418

405

plaintext_capacity = incbuffer(plaintext,

419

(size_t)plaintext_length,

420

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

421

408

if(plaintext_capacity == 0){

422

perror_plus("incbuffer");

423

plaintext_length = -1;

424

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

425

412

}

426

413

427

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

440

427

}

441

428

442

429

if(debug){

443

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

430

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

444

431

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

445

432

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

446

433

}

468

455

/* GnuTLS log function callback */

469

456

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

470

457

const char* string){

471

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

458

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

472

459

}

473

460

474

461

static int init_gnutls_global(const char *pubkeyfilename,

476

463

int ret;

477

464

478

465

if(debug){

479

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

466

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

480

467

}

481

468

482

469

ret = gnutls_global_init();

483

470

if(ret != GNUTLS_E_SUCCESS){

484

fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

485

473

return -1;

486

474

}

487

475

496

484

/* OpenPGP credentials */

497

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

498

486

if(ret != GNUTLS_E_SUCCESS){

499

fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

500

489

gnutls_global_deinit();

501

490

return -1;

502

491

}

503

492

504

493

if(debug){

505

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

494

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

506

495

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

507

496

seckeyfilename);

508

497

}

511

500

(mc.cred, pubkeyfilename, seckeyfilename,

512

501

GNUTLS_OPENPGP_FMT_BASE64);

513

502

if(ret != GNUTLS_E_SUCCESS){

514

fprintf_plus(stderr,

515

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

516

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

517

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

518

508

goto globalfail;

519

509

}

520

510

521

511

/* GnuTLS server initialization */

522

512

ret = gnutls_dh_params_init(&mc.dh_params);

523

513

if(ret != GNUTLS_E_SUCCESS){

524

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

514

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

525

515

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

526

516

goto globalfail;

527

517

}

528

518

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

529

519

if(ret != GNUTLS_E_SUCCESS){

530

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

520

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

531

521

safer_gnutls_strerror(ret));

532

522

goto globalfail;

533

523

}

554

544

}

555

545

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

556

546

if(ret != GNUTLS_E_SUCCESS){

557

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

547

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

558

548

safer_gnutls_strerror(ret));

559

549

}

560

550

568

558

}

569

559

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

570

560

if(ret != GNUTLS_E_SUCCESS){

571

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

572

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

573

564

gnutls_deinit(*session);

574

565

return -1;

575

566

}

584

575

}

585

576

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

586

577

if(ret != GNUTLS_E_SUCCESS){

587

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

578

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

588

579

safer_gnutls_strerror(ret));

589

580

gnutls_deinit(*session);

590

581

return -1;

636

627

pf = PF_INET;

637

628

break;

638

629

default:

639

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

630

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

640

631

errno = EINVAL;

641

632

return -1;

642

633

}

647

638

}

648

639

649

640

if(debug){

650

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

641

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

651

642

"\n", ip, port);

652

643

}

653

644

680

671

}

681

672

if(ret == 0){

682

673

int e = errno;

683

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

674

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

684

675

errno = e;

685

676

goto mandos_end;

686

677

}

691

682

692

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

684

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

694

-Wunreachable-code*/

685

-Wunreachable-code*/

695

686

if(if_index == AVAHI_IF_UNSPEC){

696

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

687

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

697

688

" without a network interface\n");

698

689

errno = EINVAL;

699

690

goto mandos_end;

718

709

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

719

710

perror_plus("if_indextoname");

720

711

} else {

721

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

712

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

722

713

ip, interface, port);

723

714

}

724

715

} else {

725

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

716

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

717

port);

726

718

}

727

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

728

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

738

730

perror_plus("inet_ntop");

739

731

} else {

740

732

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

741

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

733

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

742

734

}

743

735

}

744

736

}

772

764

while(true){

773

765

size_t out_size = strlen(out);

774

766

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

775

out_size - written));

767

out_size - written));

776

768

if(ret == -1){

777

769

int e = errno;

778

770

perror_plus("write");

798

790

}

799

791

800

792

if(debug){

801

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

793

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

802

794

}

803

795

804

796

if(quit_now){

824

816

825

817

if(ret != GNUTLS_E_SUCCESS){

826

818

if(debug){

827

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

819

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

828

820

gnutls_perror(ret);

829

821

}

830

822

errno = EPROTO;

834

826

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

835

827

836

828

if(debug){

837

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);

829

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

830

ip);

838

831

}

839

832

840

833

while(true){

845

838

}

846

839

847

840

buffer_capacity = incbuffer(&buffer, buffer_length,

848

buffer_capacity);

841

buffer_capacity);

849

842

if(buffer_capacity == 0){

850

843

int e = errno;

851

844

perror_plus("incbuffer");

878

871

}

879

872

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

880

873

if(ret < 0){

881

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

874

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

882

875

gnutls_perror(ret);

883

876

errno = EPROTO;

884

877

goto mandos_end;

885

878

}

886

879

break;

887

880

default:

888

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

881

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

889

882

" encrypted session with Mandos server\n");

890

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

891

884

errno = EIO;

897

890

}

898

891

899

892

if(debug){

900

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

893

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

901

894

}

902

895

903

896

if(quit_now){

915

908

916

909

if(buffer_length > 0){

917

910

ssize_t decrypted_buffer_size;

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

919

913

&decrypted_buffer);

920

914

if(decrypted_buffer_size >= 0){

921

915

932

926

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

933

927

int e = errno;

934

928

if(debug){

935

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

929

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

936

930

strerror(errno));

937

931

}

938

932

errno = e;

996

990

switch(event){

997

991

default:

998

992

case AVAHI_RESOLVER_FAILURE:

999

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

993

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

1000

994

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

1001

995

avahi_strerror(avahi_server_errno(mc.server)));

1002

996

break;

1006

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1007

1001

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

1008

1002

if(debug){

1009

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

1003

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

1010

1004

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

1011

1005

ip, (intmax_t)interface, port);

1012

1006

}

1046

1040

default:

1047

1041

case AVAHI_BROWSER_FAILURE:

1048

1042

1049

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

1043

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

1050

1044

avahi_strerror(avahi_server_errno(mc.server)));

1051

1045

avahi_simple_poll_quit(mc.simple_poll);

1052

1046

return;

1060

1054

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

1061

1055

name, type, domain, protocol, 0,

1062

1056

resolve_callback, NULL) == NULL)

1063

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

1057

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

1064

1058

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

1065

1059

break;

1066

1060

1070

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1071

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1072

1066

if(debug){

1073

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

1067

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

1074

1068

}

1075

1069

break;

1076

1070

}

1091

1085

errno = old_errno;

1092

1086

}

1093

1087

1094

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

1095

int ret;

1096

1097

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

1098

if(s < 0){

1099

perror_plus("socket");

1100

return false;

1101

}

1102

strcpy(ifr->ifr_name, ifname);

1103

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1104

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){

1105

1144

if(debug){

1106

perror_plus("ioctl SIOCGIFFLAGS");

1145

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

1146

flagstring, if_entry->d_name);

1107

1147

}

1108

return false;

1148

free(flagstring);

1149

return 0;

1109

1150

}

1110

return true;

1111

}

1112

1113

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

1114

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1115

1153

/* Reject the loopback device */

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1117

1155

if(debug){

1118

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

1156

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

1157

if_entry->d_name);

1119

1158

}

1120

return false;

1159

return 0;

1121

1160

}

1122

1161

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

1123

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

1162

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

1124

1163

if(debug){

1125

fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);

1164

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

1165

if_entry->d_name);

1126

1166

}

1127

return true;

1167

return 1;

1128

1168

}

1129

1169

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

1130

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

1170

if(not (flags & IFF_BROADCAST)){

1131

1171

if(debug){

1132

fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);

1172

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

1173

if_entry->d_name);

1133

1174

}

1134

return false;

1175

return 0;

1135

1176

}

1136

1177

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

1137

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1138

1179

if(debug){

1139

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

1180

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

1181

if_entry->d_name);

1140

1182

}

1141

return false;

1183

return 0;

1142

1184

}

1143

1144

1185

/* Accept this device */

1145

1186

if(debug){

1146

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

1147

}

1148

return true;

1149

}

1150

1151

/*

1152

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

1153

* corresponds to an acceptable network device.

1154

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

1155

*/

1156

int good_interface(const struct dirent *if_entry){

1157

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

1158

return 0;

1159

}

1160

1161

struct ifreq ifr;

1162

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

1163

if(debug){

1164

fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1187

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

1188

if_entry->d_name);

1215

1189

}

1216

1190

return 1;

1217

1191

}

1227

1201

return 1;

1228

1202

}

1229

1203

1230

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

1231

int runnable_hook(const struct dirent *direntry){

1232

int ret;

1233

size_t sret;

1234

struct stat st;

1235

1236

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

1237

/* Empty name? */

1238

return 0;

1239

}

1240

1241

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

1242

"abcdefghijklmnopqrstuvwxyz"

1243

"0123456789"

1244

"_-");

1245

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

1246

/* Contains non-allowed characters */

1247

if(debug){

1248

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

1249

direntry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

char *fullname = NULL;

1255

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

1256

if(ret < 0){

1257

perror_plus("asprintf");

1258

return 0;

1259

}

1260

1261

ret = stat(fullname, &st);

1262

if(ret == -1){

1263

if(debug){

1264

perror_plus("Could not stat hook");

1265

}

1266

return 0;

1267

}

1268

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

1269

/* Not a regular file */

1270

if(debug){

1271

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

1272

direntry->d_name);

1273

}

1274

return 0;

1275

}

1276

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

1277

/* Not executable */

1278

if(debug){

1279

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

1280

direntry->d_name);

1281

}

1282

return 0;

1283

}

1284

return 1;

1285

}

1286

1287

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1288

1205

int ret;

1289

1206

struct timespec now;

1293

1210

while(true){

1294

1211

if(mc.current_server == NULL){

1295

1212

if (debug){

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1213

fprintf(stderr,

1214

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

1297

1215

}

1298

1216

ret = avahi_simple_poll_iterate(s, -1);

1299

1217

} else {

1300

1218

if (debug){

1301

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

1219

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

1302

1220

" or wait\n");

1303

1221

}

1304

1222

/* the current time */

1321

1239

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

1322

1240

1323

1241

if (debug){

1324

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

1242

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

1325

1243

}

1326

1244

1327

1245

if(block_time <= 0){

1347

1265

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

1348

1266

}

1349

1267

if(ret != 0){

1350

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

1268

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

1351

1269

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

1352

1270

}

1353

1271

}

1441

1359

.arg = "SECONDS",

1442

1360

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

1443

1361

.group = 2 },

1444

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

1445

.arg = "DIR",

1446

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

1447

.group = 2 },

1448

1362

/*

1449

1363

* These reproduce what we would get without ARGP_NO_HELP

1450

1364

*/

1503

1417

argp_error(state, "Bad retry interval");

1504

1418

}

1505

1419

break;

1506

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

1507

hookdir = arg;

1508

break;

1509

1420

/*

1510

1421

* These reproduce what we would get without ARGP_NO_HELP

1511

1422

*/

1517

1428

argp_state_help(state, state->out_stream,

1518

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1519

1430

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

1520

fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");

1521

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

1431

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

1522

1432

exit(argp_err_exit_status);

1523

1433

break;

1524

1434

default:

1608

1518

}

1609

1519

}

1610

1520

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

1619

} else {

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

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

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

1704

}

1705

}

1706

1707

1521

if(not debug){

1708

1522

avahi_set_log_function(empty_log);

1709

1523

}

1710

1524

1711

1525

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

1712

1526

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1715

1528

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

1529

if(ret >= 1){

1723

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1724

1531

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

1725

1532

if(debug){

1726

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

1533

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

1727

1534

}

1728

1535

if(interface == NULL){

1729

1536

perror_plus("malloc");

1734

1541

free(direntries);

1735

1542

} else {

1736

1543

free(direntries);

1737

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

1544

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

1738

1545

exitcode = EXIT_FAILURE;

1739

1546

goto end;

1740

1547

}

1746

1553

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

1747

1554

mc.simple_poll = avahi_simple_poll_new();

1748

1555

if(mc.simple_poll == NULL){

1749

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

1556

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

1750

1557

exitcode = EX_UNAVAILABLE;

1751

1558

goto end;

1752

1559

}

1818

1625

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

1819

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1820

1627

if(if_index == 0){

1821

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

1628

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

1822

1629

exitcode = EX_UNAVAILABLE;

1823

1630

goto end;

1824

1631

}

1965

1772

1966

1773

ret = init_gnutls_global(pubkey, seckey);

1967

1774

if(ret == -1){

1968

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

1775

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

1969

1776

exitcode = EX_UNAVAILABLE;

1970

1777

goto end;

1971

1778

} else {

1987

1794

}

1988

1795

1989

1796

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

1990

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

1797

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

1991

1798

exitcode = EX_UNAVAILABLE;

1992

1799

goto end;

1993

1800

} else {

2003

1810

/* (Mainly meant for debugging) */

2004

1811

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

2005

1812

if(address == NULL){

2006

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

1813

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

2007

1814

exitcode = EX_USAGE;

2008

1815

goto end;

2009

1816

}

2017

1824

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

2018

1825

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

2019

1826

or tmpmax != (uint16_t)tmpmax){

2020

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

1827

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

2021

1828

exitcode = EX_USAGE;

2022

1829

goto end;

2023

1830

}

2053

1860

break;

2054

1861

}

2055

1862

if(debug){

2056

fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);

1863

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

1864

(int)retry_interval);

2057

1865

}

2058

1866

sleep((int)retry_interval);

2059

1867

}

2061

1869

if (not quit_now){

2062

1870

exitcode = EXIT_SUCCESS;

2063

1871

}

2064

1872

2065

1873

goto end;

2066

1874

}

2067

1875

2089

1897

2090

1898

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

2091

1899

if(mc.server == NULL){

2092

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

1900

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

2093

1901

avahi_strerror(error));

2094

1902

exitcode = EX_UNAVAILABLE;

2095

1903

goto end;

2104

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2105

1913

NULL, 0, browse_callback, NULL);

2106

1914

if(sb == NULL){

2107

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

1915

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

2108

1916

avahi_strerror(avahi_server_errno(mc.server)));

2109

1917

exitcode = EX_UNAVAILABLE;

2110

1918

goto end;

2117

1925

/* Run the main loop */

2118

1926

2119

1927

if(debug){

2120

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

1928

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

2121

1929

}

2122

1930

2123

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

1932

(int)(retry_interval * 1000));

2125

1933

if(debug){

2126

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

1934

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

2127

1935

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

2128

1936

}

2129

1937

2130

1938

end:

2131

1939

2132

1940

if(debug){

2133

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

1941

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

2134

1942

}

2135

1943

2136

1944

/* Cleanup things */

2164

1972

}

2165

1973

}

2166

1974

2167

/* XXX run network hooks "stop" here */

2168

2169

1975

/* Take down the network interface */

2170

1976

if(take_down_interface){

2171

1977

/* Re-raise priviliges */

2178

1984

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

2179

1985

if(ret == -1){

2180

1986

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2182

1988

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

2183

1989

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

2184

1990

if(ret == -1){

2216

2022

}

2217

2023

ret = remove(fullname);

2218

2024

if(ret == -1){

2219

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

2025

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

2026

strerror(errno));

2220

2027

}

2221

2028

free(fullname);

2222

2029

}