/mandos/trunk : revision 505.2.6

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() */

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() */

88

90

89

91

#ifdef __linux__

90

92

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

108

110

init_gnutls_session(),

109

111

GNUTLS_* */

110

112

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

113

115

114

116

/* GPGME */

115

117

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

123

125

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

124

126

#define SECKEY "seckey.txt"

125

127

#define PUBKEY "pubkey.txt"

128

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

126

129

127

130

bool debug = false;

128

131

static const char mandos_protocol_version[] = "1";

130

133

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

131

134

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

132

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

133

137

134

138

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

135

139

typedef struct server{

170

174

perror(print_text);

171

175

}

172

176

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

173

185

/*

174

186

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

175

187

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

176

188

* "buffer_length" is how much is already used.

177

189

*/

178

190

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

191

size_t buffer_capacity){

180

192

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

193

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

182

194

if(buffer == NULL){

188

200

}

189

201

190

202

/* 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){

203

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

204

int af){

194

205

int ret;

195

206

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

196

207

if(new_server == NULL){

198

209

return -1;

199

210

}

200

211

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

212

.port = port,

213

.if_index = if_index,

214

.af = af };

204

215

if(new_server->ip == NULL){

205

216

perror_plus("strdup");

206

217

return -1;

228

239

/*

229

240

* Initialize GPGME.

230

241

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

242

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

243

const char *tempdir){

233

244

gpgme_error_t rc;

234

245

gpgme_engine_info_t engine_info;

235

246

250

261

251

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

263

if(rc != GPG_ERR_NO_ERROR){

253

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

264

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

254

265

gpgme_strsource(rc), gpgme_strerror(rc));

255

266

return false;

256

267

}

257

268

258

269

rc = gpgme_op_import(mc.ctx, pgp_data);

259

270

if(rc != GPG_ERR_NO_ERROR){

260

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

271

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

261

272

gpgme_strsource(rc), gpgme_strerror(rc));

262

273

return false;

263

274

}

271

282

}

272

283

273

284

if(debug){

274

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

285

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

275

286

}

276

287

277

288

/* Init GPGME */

278

289

gpgme_check_version(NULL);

279

290

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

291

if(rc != GPG_ERR_NO_ERROR){

281

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

292

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

282

293

gpgme_strsource(rc), gpgme_strerror(rc));

283

294

return false;

284

295

}

286

297

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

287

298

rc = gpgme_get_engine_info(&engine_info);

288

299

if(rc != GPG_ERR_NO_ERROR){

289

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

300

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

290

301

gpgme_strsource(rc), gpgme_strerror(rc));

291

302

return false;

292

303

}

299

310

engine_info = engine_info->next;

300

311

}

301

312

if(engine_info == NULL){

302

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

313

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

303

314

return false;

304

315

}

305

316

306

317

/* Create new GPGME "context" */

307

318

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

308

319

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

320

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

321

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

322

gpgme_strerror(rc));

311

323

return false;

312

324

}

313

325

332

344

ssize_t plaintext_length = 0;

333

345

334

346

if(debug){

335

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

347

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

336

348

}

337

349

338

350

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

339

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

352

0);

341

353

if(rc != GPG_ERR_NO_ERROR){

342

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

354

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

343

355

gpgme_strsource(rc), gpgme_strerror(rc));

344

356

return -1;

345

357

}

347

359

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

348

360

rc = gpgme_data_new(&dh_plain);

349

361

if(rc != GPG_ERR_NO_ERROR){

350

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

362

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

363

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

351

364

gpgme_strsource(rc), gpgme_strerror(rc));

352

365

gpgme_data_release(dh_crypto);

353

366

return -1;

357

370

data buffer */

358

371

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

359

372

if(rc != GPG_ERR_NO_ERROR){

360

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

373

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

361

374

gpgme_strsource(rc), gpgme_strerror(rc));

362

375

plaintext_length = -1;

363

376

if(debug){

364

377

gpgme_decrypt_result_t result;

365

378

result = gpgme_op_decrypt_result(mc.ctx);

366

379

if(result == NULL){

367

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

380

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

368

381

} else {

369

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

382

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

370

383

result->unsupported_algorithm);

371

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

384

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

372

385

result->wrong_key_usage);

373

386

if(result->file_name != NULL){

374

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

387

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

375

388

}

376

389

gpgme_recipient_t recipient;

377

390

recipient = result->recipients;

378

391

while(recipient != NULL){

379

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

392

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

380

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

394

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

395

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

383

396

recipient->status == GPG_ERR_NO_SECKEY

384

397

? "No" : "Yes");

385

398

recipient = recipient->next;

390

403

}

391

404

392

405

if(debug){

393

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

406

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

394

407

}

395

408

396

409

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

403

416

*plaintext = NULL;

404

417

while(true){

405

418

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

419

(size_t)plaintext_length,

420

plaintext_capacity);

408

421

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

422

perror_plus("incbuffer");

423

plaintext_length = -1;

424

goto decrypt_end;

412

425

}

413

426

414

427

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

440

}

428

441

429

442

if(debug){

430

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

443

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

431

444

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

432

445

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

433

446

}

455

468

/* GnuTLS log function callback */

456

469

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

457

470

const char* string){

458

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

471

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

459

472

}

460

473

461

474

static int init_gnutls_global(const char *pubkeyfilename,

463

476

int ret;

464

477

465

478

if(debug){

466

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

479

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

467

480

}

468

481

469

482

ret = gnutls_global_init();

470

483

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

484

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

473

485

return -1;

474

486

}

475

487

484

496

/* OpenPGP credentials */

485

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

498

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

499

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

489

500

gnutls_global_deinit();

490

501

return -1;

491

502

}

492

503

493

504

if(debug){

494

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

505

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

495

506

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

496

507

seckeyfilename);

497

508

}

500

511

(mc.cred, pubkeyfilename, seckeyfilename,

501

512

GNUTLS_OPENPGP_FMT_BASE64);

502

513

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));

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));

508

518

goto globalfail;

509

519

}

510

520

511

521

/* GnuTLS server initialization */

512

522

ret = gnutls_dh_params_init(&mc.dh_params);

513

523

if(ret != GNUTLS_E_SUCCESS){

514

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

524

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

515

525

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

516

526

goto globalfail;

517

527

}

518

528

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

519

529

if(ret != GNUTLS_E_SUCCESS){

520

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

530

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

521

531

safer_gnutls_strerror(ret));

522

532

goto globalfail;

523

533

}

544

554

}

545

555

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

546

556

if(ret != GNUTLS_E_SUCCESS){

547

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

557

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

548

558

safer_gnutls_strerror(ret));

549

559

}

550

560

558

568

}

559

569

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

560

570

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));

571

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

572

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

564

573

gnutls_deinit(*session);

565

574

return -1;

566

575

}

575

584

}

576

585

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

577

586

if(ret != GNUTLS_E_SUCCESS){

578

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

587

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

579

588

safer_gnutls_strerror(ret));

580

589

gnutls_deinit(*session);

581

590

return -1;

627

636

pf = PF_INET;

628

637

break;

629

638

default:

630

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

639

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

631

640

errno = EINVAL;

632

641

return -1;

633

642

}

638

647

}

639

648

640

649

if(debug){

641

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

650

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

642

651

"\n", ip, port);

643

652

}

644

653

671

680

}

672

681

if(ret == 0){

673

682

int e = errno;

674

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

683

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

675

684

errno = e;

676

685

goto mandos_end;

677

686

}

682

691

683

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

693

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

685

-Wunreachable-code*/

694

-Wunreachable-code*/

686

695

if(if_index == AVAHI_IF_UNSPEC){

687

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

696

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

688

697

" without a network interface\n");

689

698

errno = EINVAL;

690

699

goto mandos_end;

709

718

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

710

719

perror_plus("if_indextoname");

711

720

} else {

712

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

721

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

713

722

ip, interface, port);

714

723

}

715

724

} else {

716

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

717

port);

725

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

718

726

}

719

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

738

perror_plus("inet_ntop");

731

739

} else {

732

740

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

733

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

741

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

734

742

}

735

743

}

736

744

}

764

772

while(true){

765

773

size_t out_size = strlen(out);

766

774

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

767

out_size - written));

775

out_size - written));

768

776

if(ret == -1){

769

777

int e = errno;

770

778

perror_plus("write");

790

798

}

791

799

792

800

if(debug){

793

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

801

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

794

802

}

795

803

796

804

if(quit_now){

816

824

817

825

if(ret != GNUTLS_E_SUCCESS){

818

826

if(debug){

819

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

827

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

820

828

gnutls_perror(ret);

821

829

}

822

830

errno = EPROTO;

826

834

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

827

835

828

836

if(debug){

829

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

830

ip);

837

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

831

838

}

832

839

833

840

while(true){

838

845

}

839

846

840

847

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

848

buffer_capacity);

842

849

if(buffer_capacity == 0){

843

850

int e = errno;

844

851

perror_plus("incbuffer");

871

878

}

872

879

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

873

880

if(ret < 0){

874

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

881

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

875

882

gnutls_perror(ret);

876

883

errno = EPROTO;

877

884

goto mandos_end;

878

885

}

879

886

break;

880

887

default:

881

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

888

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

882

889

" encrypted session with Mandos server\n");

883

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

891

errno = EIO;

890

897

}

891

898

892

899

if(debug){

893

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

900

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

894

901

}

895

902

896

903

if(quit_now){

908

915

909

916

if(buffer_length > 0){

910

917

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

919

&decrypted_buffer);

914

920

if(decrypted_buffer_size >= 0){

915

921

926

932

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

927

933

int e = errno;

928

934

if(debug){

929

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

935

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

930

936

strerror(errno));

931

937

}

932

938

errno = e;

990

996

switch(event){

991

997

default:

992

998

case AVAHI_RESOLVER_FAILURE:

993

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

999

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

994

1000

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

995

1001

avahi_strerror(avahi_server_errno(mc.server)));

996

1002

break;

1000

1006

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1007

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

1002

1008

if(debug){

1003

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

1009

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

1004

1010

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

1005

1011

ip, (intmax_t)interface, port);

1006

1012

}

1040

1046

default:

1041

1047

case AVAHI_BROWSER_FAILURE:

1042

1048

1043

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

1049

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

1044

1050

avahi_strerror(avahi_server_errno(mc.server)));

1045

1051

avahi_simple_poll_quit(mc.simple_poll);

1046

1052

return;

1054

1060

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

1055

1061

name, type, domain, protocol, 0,

1056

1062

resolve_callback, NULL) == NULL)

1057

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

1063

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

1058

1064

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

1059

1065

break;

1060

1066

1064

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1072

if(debug){

1067

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

1073

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

1068

1074

}

1069

1075

break;

1070

1076

}

1085

1091

errno = old_errno;

1086

1092

}

1087

1093

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){

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){

1144

1105

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1106

perror_plus("ioctl SIOCGIFFLAGS");

1147

1107

}

1148

free(flagstring);

1149

return 0;

1108

return false;

1150

1109

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1110

return true;

1111

}

1112

1113

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

1114

1153

1115

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1117

if(debug){

1156

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

1157

if_entry->d_name);

1118

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

1158

1119

}

1159

return 0;

1120

return false;

1160

1121

}

1161

1122

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

1162

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

1123

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

1163

1124

if(debug){

1164

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

1165

if_entry->d_name);

1125

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

1166

1126

}

1167

return 1;

1127

return true;

1168

1128

}

1169

1129

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

1170

if(not (flags & IFF_BROADCAST)){

1130

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

1171

1131

if(debug){

1172

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

1173

if_entry->d_name);

1132

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

1174

1133

}

1175

return 0;

1134

return false;

1176

1135

}

1177

1136

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

1178

if(flags & IFF_NOARP){

1137

if(ifr->ifr_flags & IFF_NOARP){

1179

1138

if(debug){

1180

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

1181

if_entry->d_name);

1139

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

1182

1140

}

1183

return 0;

1141

return false;

1184

1142

}

1143

1185

1144

/* Accept this device */

1186

1145

if(debug){

1187

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

1188

if_entry->d_name);

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;

1189

1215

}

1190

1216

return 1;

1191

1217

}

1201

1227

return 1;

1202

1228

}

1203

1229

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

1204

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1288

int ret;

1206

1289

struct timespec now;

1210

1293

while(true){

1211

1294

if(mc.current_server == NULL){

1212

1295

if (debug){

1213

fprintf(stderr,

1214

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

1296

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

1215

1297

}

1216

1298

ret = avahi_simple_poll_iterate(s, -1);

1217

1299

} else {

1218

1300

if (debug){

1219

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

1301

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

1220

1302

" or wait\n");

1221

1303

}

1222

1304

/* the current time */

1239

1321

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

1240

1322

1241

1323

if (debug){

1242

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

1324

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

1243

1325

}

1244

1326

1245

1327

if(block_time <= 0){

1265

1347

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

1266

1348

}

1267

1349

if(ret != 0){

1268

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

1350

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

1269

1351

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

1270

1352

}

1271

1353

}

1359

1441

.arg = "SECONDS",

1360

1442

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

1361

1443

.group = 2 },

1444

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

1445

.arg = "DIR",

1446

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

1447

.group = 2 },

1362

1448

/*

1363

1449

* These reproduce what we would get without ARGP_NO_HELP

1364

1450

*/

1417

1503

argp_error(state, "Bad retry interval");

1418

1504

}

1419

1505

break;

1506

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

1507

hookdir = arg;

1508

break;

1420

1509

/*

1421

1510

* These reproduce what we would get without ARGP_NO_HELP

1422

1511

*/

1428

1517

argp_state_help(state, state->out_stream,

1429

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1519

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

1431

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

1520

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

1521

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

1432

1522

exit(argp_err_exit_status);

1433

1523

break;

1434

1524

default:

1518

1608

}

1519

1609

}

1520

1610

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

1521

1707

if(not debug){

1522

1708

avahi_set_log_function(empty_log);

1523

1709

}

1524

1710

1525

1711

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

1526

1712

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1715

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

}

1529

1722

if(ret >= 1){

1530

/* Pick the first good interface */

1723

/* Pick the first interface returned */

1531

1724

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

1532

1725

if(debug){

1533

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

1726

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

1534

1727

}

1535

1728

if(interface == NULL){

1536

1729

perror_plus("malloc");

1541

1734

free(direntries);

1542

1735

} else {

1543

1736

free(direntries);

1544

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

1737

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

1545

1738

exitcode = EXIT_FAILURE;

1546

1739

goto end;

1547

1740

}

1553

1746

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

1554

1747

mc.simple_poll = avahi_simple_poll_new();

1555

1748

if(mc.simple_poll == NULL){

1556

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

1749

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

1557

1750

exitcode = EX_UNAVAILABLE;

1558

1751

goto end;

1559

1752

}

1625

1818

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

1626

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1820

if(if_index == 0){

1628

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

1821

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

1629

1822

exitcode = EX_UNAVAILABLE;

1630

1823

goto end;

1631

1824

}

1772

1965

1773

1966

ret = init_gnutls_global(pubkey, seckey);

1774

1967

if(ret == -1){

1775

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

1968

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

1776

1969

exitcode = EX_UNAVAILABLE;

1777

1970

goto end;

1778

1971

} else {

1794

1987

}

1795

1988

1796

1989

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

1797

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

1990

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

1798

1991

exitcode = EX_UNAVAILABLE;

1799

1992

goto end;

1800

1993

} else {

1810

2003

/* (Mainly meant for debugging) */

1811

2004

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

1812

2005

if(address == NULL){

1813

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

2006

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

1814

2007

exitcode = EX_USAGE;

1815

2008

goto end;

1816

2009

}

1824

2017

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

1825

2018

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

1826

2019

or tmpmax != (uint16_t)tmpmax){

1827

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

2020

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

1828

2021

exitcode = EX_USAGE;

1829

2022

goto end;

1830

2023

}

1860

2053

break;

1861

2054

}

1862

2055

if(debug){

1863

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

1864

(int)retry_interval);

2056

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

1865

2057

}

1866

2058

sleep((int)retry_interval);

1867

2059

}

1869

2061

if (not quit_now){

1870

2062

exitcode = EXIT_SUCCESS;

1871

2063

}

1872

2064

1873

2065

goto end;

1874

2066

}

1875

2067

1897

2089

1898

2090

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

1899

2091

if(mc.server == NULL){

1900

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

2092

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

1901

2093

avahi_strerror(error));

1902

2094

exitcode = EX_UNAVAILABLE;

1903

2095

goto end;

1912

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2105

NULL, 0, browse_callback, NULL);

1914

2106

if(sb == NULL){

1915

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

2107

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

1916

2108

avahi_strerror(avahi_server_errno(mc.server)));

1917

2109

exitcode = EX_UNAVAILABLE;

1918

2110

goto end;

1925

2117

/* Run the main loop */

1926

2118

1927

2119

if(debug){

1928

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

2120

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

1929

2121

}

1930

2122

1931

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2124

(int)(retry_interval * 1000));

1933

2125

if(debug){

1934

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

2126

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

1935

2127

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

1936

2128

}

1937

2129

1938

2130

end:

1939

2131

1940

2132

if(debug){

1941

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

2133

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

1942

2134

}

1943

2135

1944

2136

/* Cleanup things */

1972

2164

}

1973

2165

}

1974

2166

2167

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

2168

1975

2169

/* Take down the network interface */

1976

2170

if(take_down_interface){

1977

2171

/* Re-raise priviliges */

1984

2178

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

1985

2179

if(ret == -1){

1986

2180

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2181

} else if(network.ifr_flags & IFF_UP){

1988

2182

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

1989

2183

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

1990

2184

if(ret == -1){

2022

2216

}

2023

2217

ret = remove(fullname);

2024

2218

if(ret == -1){

2025

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

2026

strerror(errno));

2219

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

2027

2220

}

2028

2221

free(fullname);

2029

2222

}