/mandos/release : revision 237.7.34

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{

180

176

* "buffer_length" is how much is already used.

181

177

*/

182

178

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

179

size_t buffer_capacity){

184

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

181

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

186

182

if(buffer == NULL){

191

187

return buffer_capacity;

192

188

}

193

189

194

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

195

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

196

int af){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

197

193

int ret;

198

194

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

199

195

if(new_server == NULL){

201

197

return -1;

202

198

}

203

199

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

207

203

if(new_server->ip == NULL){

208

204

perror_plus("strdup");

209

205

return -1;

210

206

}

211

/* Special case of first server */

207

/* unique case of first server */

212

208

if (mc.current_server == NULL){

213

209

new_server->next = new_server;

214

210

new_server->prev = new_server;

215

211

mc.current_server = new_server;

216

/* Place the new server last in the list */

212

/* Placing the new server last in the list */

217

213

} else {

218

214

new_server->next = mc.current_server;

219

215

new_server->prev = mc.current_server->prev;

231

227

/*

232

228

* Initialize GPGME.

233

229

*/

234

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

235

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

236

232

gpgme_error_t rc;

237

233

gpgme_engine_info_t engine_info;

238

234

253

249

254

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

251

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

252

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

258

253

gpgme_strsource(rc), gpgme_strerror(rc));

259

254

return false;

260

255

}

261

256

262

257

rc = gpgme_op_import(mc.ctx, pgp_data);

263

258

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

259

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

266

260

gpgme_strsource(rc), gpgme_strerror(rc));

267

261

return false;

268

262

}

276

270

}

277

271

278

272

if(debug){

279

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

280

"Initializing GPGME\n");

273

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

281

274

}

282

275

283

276

/* Init GPGME */

284

277

gpgme_check_version(NULL);

285

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

279

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

280

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

289

281

gpgme_strsource(rc), gpgme_strerror(rc));

290

282

return false;

291

283

}

292

284

293

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

285

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

294

286

rc = gpgme_get_engine_info(&engine_info);

295

287

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

288

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

298

289

gpgme_strsource(rc), gpgme_strerror(rc));

299

290

return false;

300

291

}

307

298

engine_info = engine_info->next;

308

299

}

309

300

if(engine_info == NULL){

310

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

311

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

301

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

312

302

return false;

313

303

}

314

304

315

305

/* Create new GPGME "context" */

316

306

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

317

307

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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

320

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

321

310

return false;

322

311

}

323

312

342

331

ssize_t plaintext_length = 0;

343

332

344

333

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

334

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

347

335

}

348

336

349

337

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

350

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

339

0);

352

340

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

341

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

355

342

gpgme_strsource(rc), gpgme_strerror(rc));

356

343

return -1;

357

344

}

359

346

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

360

347

rc = gpgme_data_new(&dh_plain);

361

348

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

349

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

364

350

gpgme_strsource(rc), gpgme_strerror(rc));

365

351

gpgme_data_release(dh_crypto);

366

352

return -1;

370

356

data buffer */

371

357

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

372

358

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

359

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

375

360

gpgme_strsource(rc), gpgme_strerror(rc));

376

361

plaintext_length = -1;

377

362

if(debug){

378

363

gpgme_decrypt_result_t result;

379

364

result = gpgme_op_decrypt_result(mc.ctx);

380

365

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

366

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

383

367

} else {

384

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

385

"Unsupported algorithm: %s\n",

368

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

386

369

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

370

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

389

371

result->wrong_key_usage);

390

372

if(result->file_name != NULL){

391

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

392

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

373

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

393

374

}

394

375

gpgme_recipient_t recipient;

395

376

recipient = result->recipients;

396

377

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

378

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

399

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

380

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

381

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

404

382

recipient->status == GPG_ERR_NO_SECKEY

405

383

? "No" : "Yes");

406

384

recipient = recipient->next;

411

389

}

412

390

413

391

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

392

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

416

393

}

417

394

418

395

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

425

402

*plaintext = NULL;

426

403

while(true){

427

404

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

430

407

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

434

411

}

435

412

436

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

449

426

}

450

427

451

428

if(debug){

452

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

453

"Decrypted password is: ");

429

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

454

430

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

455

431

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

456

432

}

478

454

/* GnuTLS log function callback */

479

455

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

480

456

const char* string){

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

457

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

482

458

}

483

459

484

460

static int init_gnutls_global(const char *pubkeyfilename,

486

462

int ret;

487

463

488

464

if(debug){

489

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

490

"Initializing GnuTLS\n");

465

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

491

466

}

492

467

493

468

ret = gnutls_global_init();

494

469

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

470

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

471

safer_gnutls_strerror(ret));

497

472

return -1;

498

473

}

499

474

508

483

/* OpenPGP credentials */

509

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

485

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

486

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

487

safer_gnutls_strerror(ret));

513

488

gnutls_global_deinit();

514

489

return -1;

515

490

}

516

491

517

492

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

493

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

520

494

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

521

495

seckeyfilename);

522

496

}

526

500

GNUTLS_OPENPGP_FMT_BASE64);

527

501

if(ret != GNUTLS_E_SUCCESS){

528

502

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

503

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

531

504

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

532

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

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

505

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

506

safer_gnutls_strerror(ret));

534

507

goto globalfail;

535

508

}

536

509

537

510

/* GnuTLS server initialization */

538

511

ret = gnutls_dh_params_init(&mc.dh_params);

539

512

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

513

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

542

514

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

543

515

goto globalfail;

544

516

}

545

517

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

546

518

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

519

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

549

520

safer_gnutls_strerror(ret));

550

521

goto globalfail;

551

522

}

572

543

}

573

544

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

574

545

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

546

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

577

547

safer_gnutls_strerror(ret));

578

548

}

579

549

587

557

}

588

558

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

589

559

if(ret != GNUTLS_E_SUCCESS){

590

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

591

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

592

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

593

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

560

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

561

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

562

safer_gnutls_strerror(ret));

594

563

gnutls_deinit(*session);

595

564

return -1;

596

565

}

605

574

}

606

575

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

607

576

if(ret != GNUTLS_E_SUCCESS){

608

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

609

"Error setting GnuTLS credentials: %s\n",

577

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

610

578

safer_gnutls_strerror(ret));

611

579

gnutls_deinit(*session);

612

580

return -1;

658

626

pf = PF_INET;

659

627

break;

660

628

default:

661

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

662

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

629

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

663

630

errno = EINVAL;

664

631

return -1;

665

632

}

670

637

}

671

638

672

639

if(debug){

673

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

674

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

640

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

675

641

"\n", ip, port);

676

642

}

677

643

704

670

}

705

671

if(ret == 0){

706

672

int e = errno;

707

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

708

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

673

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

709

674

errno = e;

710

675

goto mandos_end;

711

676

}

716

681

717

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

683

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

719

-Wunreachable-code*/

684

-Wunreachable-code*/

720

685

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

686

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

723

687

" without a network interface\n");

724

688

errno = EINVAL;

725

689

goto mandos_end;

744

708

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

745

709

perror_plus("if_indextoname");

746

710

} else {

747

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

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

711

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

749

712

ip, interface, port);

750

713

}

751

714

} else {

752

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

753

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

715

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

716

port);

754

717

}

755

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

729

perror_plus("inet_ntop");

767

730

} else {

768

731

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

769

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

770

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

732

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

771

733

}

772

734

}

773

735

}

801

763

while(true){

802

764

size_t out_size = strlen(out);

803

765

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

804

out_size - written));

766

out_size - written));

805

767

if(ret == -1){

806

768

int e = errno;

807

769

perror_plus("write");

827

789

}

828

790

829

791

if(debug){

830

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

831

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

792

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

832

793

}

833

794

834

795

if(quit_now){

854

815

855

816

if(ret != GNUTLS_E_SUCCESS){

856

817

if(debug){

857

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

858

"*** GnuTLS Handshake failed ***\n");

818

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

859

819

gnutls_perror(ret);

860

820

}

861

821

errno = EPROTO;

865

825

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

866

826

867

827

if(debug){

868

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

869

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

828

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

829

ip);

870

830

}

871

831

872

832

while(true){

877

837

}

878

838

879

839

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

840

buffer_capacity);

881

841

if(buffer_capacity == 0){

882

842

int e = errno;

883

843

perror_plus("incbuffer");

910

870

}

911

871

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

912

872

if(ret < 0){

913

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

914

"*** GnuTLS Re-handshake failed ***\n");

873

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

915

874

gnutls_perror(ret);

916

875

errno = EPROTO;

917

876

goto mandos_end;

918

877

}

919

878

break;

920

879

default:

921

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

922

"Unknown error while reading data from"

880

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

923

881

" encrypted session with Mandos server\n");

924

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

883

errno = EIO;

931

889

}

932

890

933

891

if(debug){

934

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

935

"Closing TLS session\n");

892

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

936

893

}

937

894

938

895

if(quit_now){

950

907

951

908

if(buffer_length > 0){

952

909

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

954

912

&decrypted_buffer);

955

913

if(decrypted_buffer_size >= 0){

956

914

967

925

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

968

926

int e = errno;

969

927

if(debug){

970

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

971

"Error writing encrypted data: %s\n",

928

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

972

929

strerror(errno));

973

930

}

974

931

errno = e;

1032

989

switch(event){

1033

990

default:

1034

991

case AVAHI_RESOLVER_FAILURE:

1035

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

1036

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

992

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

1037

993

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

1038

994

avahi_strerror(avahi_server_errno(mc.server)));

1039

995

break;

1043

999

char ip[AVAHI_ADDRESS_STR_MAX];

1044

1000

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

1045

1001

if(debug){

1046

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

1047

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

1002

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

1048

1003

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

1049

1004

ip, (intmax_t)interface, port);

1050

1005

}

1084

1039

default:

1085

1040

case AVAHI_BROWSER_FAILURE:

1086

1041

1087

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

1088

"(Avahi browser) %s\n",

1042

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

1089

1043

avahi_strerror(avahi_server_errno(mc.server)));

1090

1044

avahi_simple_poll_quit(mc.simple_poll);

1091

1045

return;

1099

1053

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

1100

1054

name, type, domain, protocol, 0,

1101

1055

resolve_callback, NULL) == NULL)

1102

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

1103

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

1056

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

1104

1057

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

1105

1058

break;

1106

1059

1110

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

1065

if(debug){

1113

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

1114

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

1066

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

1115

1067

}

1116

1068

break;

1117

1069

}

1132

1084

errno = old_errno;

1133

1085

}

1134

1086

1135

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

1136

int ret;

1137

1138

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

1139

if(s < 0){

1140

perror_plus("socket");

1141

return false;

1142

}

1143

strcpy(ifr->ifr_name, ifname);

1144

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1146

1143

if(debug){

1147

perror_plus("ioctl SIOCGIFFLAGS");

1144

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

1145

flagstring, if_entry->d_name);

1148

1146

}

1149

return false;

1147

free(flagstring);

1148

return 0;

1150

1149

}

1151

return true;

1152

}

1153

1154

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

1155

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1156

1152

/* Reject the loopback device */

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1158

1154

if(debug){

1159

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

1160

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

1155

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

1156

if_entry->d_name);

1161

1157

}

1162

return false;

1158

return 0;

1163

1159

}

1164

1160

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

1165

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

1161

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

1166

1162

if(debug){

1167

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

1168

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

1163

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

1164

if_entry->d_name);

1169

1165

}

1170

return true;

1166

return 1;

1171

1167

}

1172

1168

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

1173

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

1169

if(not (flags & IFF_BROADCAST)){

1174

1170

if(debug){

1175

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

1176

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

1171

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

1172

if_entry->d_name);

1177

1173

}

1178

return false;

1174

return 0;

1179

1175

}

1180

1176

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

1181

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1182

1178

if(debug){

1183

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

1184

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

1179

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

1180

if_entry->d_name);

1185

1181

}

1186

return false;

1182

return 0;

1187

1183

}

1188

1189

1184

/* Accept this device */

1190

1185

if(debug){

1191

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

1192

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

1193

}

1194

return true;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device.

1200

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

1201

*/

1202

int good_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(stderr, "Mandos plugin mandos-client: "

1211

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

1212

if_entry->d_name);

1213

}

1214

return 0;

1215

}

1216

1217

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

1218

return 0;

1219

}

1220

return 1;

1221

}

1222

1223

/*

1224

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

1225

* corresponds to an acceptable network device which is up.

1226

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

1227

*/

1228

int up_interface(const struct dirent *if_entry){

1229

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

1230

return 0;

1231

}

1232

1233

struct ifreq ifr;

1234

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

1235

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

/* Reject down interfaces */

1244

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

1245

if(debug){

1246

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

1247

"Rejecting down interface \"%s\"\n",

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject non-running interfaces */

1254

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

1255

if(debug){

1256

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

1257

"Rejecting non-running interface \"%s\"\n",

1258

if_entry->d_name);

1259

}

1260

return 0;

1261

}

1262

1263

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

1264

return 0;

1186

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

1187

if_entry->d_name);

1265

1188

}

1266

1189

return 1;

1267

1190

}

1277

1200

return 1;

1278

1201

}

1279

1202

1280

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

1281

int runnable_hook(const struct dirent *direntry){

1282

int ret;

1283

size_t sret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

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

1292

"abcdefghijklmnopqrstuvwxyz"

1293

"0123456789"

1294

"_-");

1295

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

1296

/* Contains non-allowed characters */

1297

if(debug){

1298

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

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

1305

char *fullname = NULL;

1306

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

1307

if(ret < 0){

1308

perror_plus("asprintf");

1309

return 0;

1310

}

1311

1312

ret = stat(fullname, &st);

1313

if(ret == -1){

1314

if(debug){

1315

perror_plus("Could not stat hook");

1316

}

1317

return 0;

1318

}

1319

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

1320

/* Not a regular file */

1321

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1325

}

1326

return 0;

1327

}

1328

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

1329

/* Not executable */

1330

if(debug){

1331

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

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1334

}

1335

return 0;

1336

}

1337

return 1;

1338

}

1339

1340

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1341

1204

int ret;

1342

1205

struct timespec now;

1343

1206

struct timespec waited_time;

1344

1207

intmax_t block_time;

1345

1208

1346

1209

while(true){

1347

1210

if(mc.current_server == NULL){

1348

1211

if (debug){

1349

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

1212

fprintf(stderr,

1350

1213

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

1351

1214

}

1352

1215

ret = avahi_simple_poll_iterate(s, -1);

1353

1216

} else {

1354

1217

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1218

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

1357

1219

" or wait\n");

1358

1220

}

1359

1221

/* the current time */

1374

1236

block_time = ((retry_interval

1375

1237

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

1376

1238

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

1377

1239

1378

1240

if (debug){

1379

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

1380

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

1241

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

1381

1242

}

1382

1243

1383

1244

if(block_time <= 0){

1384

1245

ret = start_mandos_communication(mc.current_server->ip,

1385

1246

mc.current_server->port,

1403

1264

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

1404

1265

}

1405

1266

if(ret != 0){

1406

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

1267

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

1407

1268

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

1408

1269

}

1409

1270

}

1410

1271

}

1411

1272

}

1412

1273

1413

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

1414

const float delay){

1415

struct dirent **direntries;

1416

struct dirent *direntry;

1417

int ret;

1418

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

1419

alphasort);

1420

if(numhooks == -1){

1421

perror_plus("scandir");

1422

} else {

1423

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

1424

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

1425

direntry = direntries[0];

1426

char *fullname = NULL;

1427

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

1428

if(ret < 0){

1429

perror_plus("asprintf");

1430

continue;

1431

}

1432

pid_t hook_pid = fork();

1433

if(hook_pid == 0){

1434

/* Child */

1435

dup2(devnull, STDIN_FILENO);

1436

close(devnull);

1437

dup2(STDERR_FILENO, STDOUT_FILENO);

1438

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

1439

if(ret == -1){

1440

perror_plus("setenv");

1441

return false;

1442

}

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

return false;

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

return false;

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

return false;

1457

}

1458

char *delaystring;

1459

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

1460

if(ret == -1){

1461

perror_plus("asprintf");

1462

return false;

1463

}

1464

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

1465

if(ret == -1){

1466

free(delaystring);

1467

perror_plus("setenv");

1468

return false;

1469

}

1470

free(delaystring);

1471

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

1472

perror_plus("execl");

1473

} else {

1474

int status;

1475

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

1476

perror_plus("waitpid");

1477

free(fullname);

1478

continue;

1479

}

1480

if(WIFEXITED(status)){

1481

if(WEXITSTATUS(status) != 0){

1482

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

1483

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

1491

"Warning: network hook \"%s\" died by"

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

"Warning: network hook \"%s\" crashed\n",

1499

direntry->d_name);

1500

free(fullname);

1501

continue;

1502

}

1503

}

1504

free(fullname);

1505

if(quit_now){

1506

break;

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1512

}

1513

1514

1274

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

1515

1275

AvahiSServiceBrowser *sb = NULL;

1516

1276

int error;

1598

1358

.arg = "SECONDS",

1599

1359

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

1600

1360

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

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

1604

.group = 2 },

1605

1361

/*

1606

1362

* These reproduce what we would get without ARGP_NO_HELP

1607

1363

*/

1655

1411

errno = 0;

1656

1412

retry_interval = strtod(arg, &tmp);

1657

1413

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

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1660

1415

argp_error(state, "Bad retry interval");

1661

1416

}

1662

1417

break;

1663

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

1664

hookdir = arg;

1665

break;

1666

1418

/*

1667

1419

* These reproduce what we would get without ARGP_NO_HELP

1668

1420

*/

1674

1426

argp_state_help(state, state->out_stream,

1675

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1676

1428

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

1677

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

1678

1429

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

1679

1430

exit(argp_err_exit_status);

1680

1431

break;

1704

1455

goto end;

1705

1456

}

1706

1457

}

1707

1708

{

1709

/* Work around Debian bug #633582:

1710

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

1711

struct stat st;

1712

1713

/* Re-raise priviliges */

1714

errno = 0;

1715

ret = seteuid(0);

1716

if(ret == -1){

1717

perror_plus("seteuid");

1718

}

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

1768

/* Run network hooks */

1769

{

1770

/* Re-raise priviliges */

1771

errno = 0;

1772

ret = seteuid(0);

1773

if(ret == -1){

1774

perror_plus("seteuid");

1775

}

1776

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

1777

goto end;

1778

}

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1785

}

1786

1458

1787

1459

if(not debug){

1788

1460

avahi_set_log_function(empty_log);

1789

1461

}

1790

1462

1791

1463

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

1792

1464

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1466

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

1467

if(ret >= 1){

1803

/* Pick the first interface returned */

1468

/* Pick the first good interface */

1804

1469

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

1805

1470

if(debug){

1806

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

1807

"Using interface \"%s\"\n", interface);

1471

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

1808

1472

}

1809

1473

if(interface == NULL){

1810

1474

perror_plus("malloc");

1815

1479

free(direntries);

1816

1480

} else {

1817

1481

free(direntries);

1818

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

1819

"Could not find a network interface\n");

1482

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

1820

1483

exitcode = EXIT_FAILURE;

1821

1484

goto end;

1822

1485

}

1828

1491

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

1829

1492

mc.simple_poll = avahi_simple_poll_new();

1830

1493

if(mc.simple_poll == NULL){

1831

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

1832

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

1494

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

1833

1495

exitcode = EX_UNAVAILABLE;

1834

1496

goto end;

1835

1497

}

1901

1563

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

1902

1564

if_index = (AvahiIfIndex) if_nametoindex(interface);

1903

1565

if(if_index == 0){

1904

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

1905

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

1566

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

1906

1567

exitcode = EX_UNAVAILABLE;

1907

1568

goto end;

1908

1569

}

2028

1689

#endif /* __linux__ */

2029

1690

/* Lower privileges */

2030

1691

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

1698

} else {

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

2035

1704

}

2036

1705

}

2037

1706

2041

1710

2042

1711

ret = init_gnutls_global(pubkey, seckey);

2043

1712

if(ret == -1){

2044

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

2045

"init_gnutls_global failed\n");

1713

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

2046

1714

exitcode = EX_UNAVAILABLE;

2047

1715

goto end;

2048

1716

} else {

2064

1732

}

2065

1733

2066

1734

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

2067

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

2068

"init_gpgme failed\n");

1735

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

2069

1736

exitcode = EX_UNAVAILABLE;

2070

1737

goto end;

2071

1738

} else {

2081

1748

/* (Mainly meant for debugging) */

2082

1749

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

2083

1750

if(address == NULL){

2084

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

2085

"No colon in address\n");

1751

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

2086

1752

exitcode = EX_USAGE;

2087

1753

goto end;

2088

1754

}

2096

1762

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

2097

1763

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

2098

1764

or tmpmax != (uint16_t)tmpmax){

2099

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

2100

"Bad port number\n");

1765

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

2101

1766

exitcode = EX_USAGE;

2102

1767

goto end;

2103

1768

}

2108

1773

2109

1774

port = (uint16_t)tmpmax;

2110

1775

*address = '\0';

1776

address = connect_to;

2111

1777

/* Colon in address indicates IPv6 */

2112

1778

int af;

2113

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

1779

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

2114

1780

af = AF_INET6;

2115

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

2116

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

2117

{

2118

connect_to++;

2119

address[-1] = '\0';

2120

}

2121

1781

} else {

2122

1782

af = AF_INET;

2123

1783

}

2124

address = connect_to;

2125

1784

2126

1785

if(quit_now){

2127

1786

goto end;

2128

1787

}

2129

1788

2130

1789

while(not quit_now){

2131

1790

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

2132

1791

if(quit_now or ret == 0){

2133

1792

break;

2134

1793

}

2135

if(debug){

2136

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

2137

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

2138

}

2139

sleep((int)retry_interval);

2140

}

2141

1794

sleep((int)retry_interval or 1);

1795

};

1796

2142

1797

if (not quit_now){

2143

1798

exitcode = EXIT_SUCCESS;

2144

1799

}

2145

1800

2146

1801

goto end;

2147

1802

}

2148

1803

2170

1825

2171

1826

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

2172

1827

if(mc.server == NULL){

2173

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

2174

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

1828

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

2175

1829

avahi_strerror(error));

2176

1830

exitcode = EX_UNAVAILABLE;

2177

1831

goto end;

2186

1840

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2187

1841

NULL, 0, browse_callback, NULL);

2188

1842

if(sb == NULL){

2189

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

2190

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

1843

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

2191

1844

avahi_strerror(avahi_server_errno(mc.server)));

2192

1845

exitcode = EX_UNAVAILABLE;

2193

1846

goto end;

2200

1853

/* Run the main loop */

2201

1854

2202

1855

if(debug){

2203

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

2204

"Starting Avahi loop search\n");

1856

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

2205

1857

}

2206

1858

2207

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

2208

1860

(int)(retry_interval * 1000));

2209

1861

if(debug){

2210

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

2211

"avahi_loop_with_timeout exited %s\n",

1862

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

2212

1863

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

2213

1864

}

2214

1865

2215

1866

end:

2216

1867

2217

1868

if(debug){

2218

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

2219

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

1869

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

2220

1870

}

2221

1871

2222

1872

/* Cleanup things */

2250

1900

}

2251

1901

}

2252

1902

2253

/* Re-raise priviliges */

2254

{

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

2255

1906

errno = 0;

2256

1907

ret = seteuid(0);

2257

1908

if(ret == -1){

2258

1909

perror_plus("seteuid");

2259

1910

}

2260

/* Run network hooks */

2261

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

2262

goto end;

2263

}

2264

2265

/* Take down the network interface */

2266

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

1911

if(geteuid() == 0){

2267

1912

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

2268

1913

if(ret == -1){

2269

1914

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

1915

} else if(network.ifr_flags & IFF_UP) {

2271

1916

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

2272

1917

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

2273

1918

if(ret == -1){

2278

1923

if(ret == -1){

2279

1924

perror_plus("close");

2280

1925

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

2281

1932

}

2282

1933

}

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2289

1934

2290

1935

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

2291

1936

if(tempdir_created){

2292

1937

struct dirent **direntries = NULL;

2293

1938

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

2297

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

1939

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

1940

if (ret > 0){

1941

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

2298

1942

direntry = direntries[i];

2299

1943

char *fullname = NULL;

2300

1944

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

2305

1949

}

2306

1950

ret = remove(fullname);

2307

1951

if(ret == -1){

2308

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

2309

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

1952

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

1953

strerror(errno));

2310

1954

}

2311

1955

free(fullname);

2312

1956

}

2313

1957

}

2314

1958

2315

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

1959

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

1960

specify */

2316

1961

free(direntries);

2317

if (numentries == -1){

1962

if (ret == -1){

2318

1963

perror_plus("scandir");

2319

1964

}

2320

1965

ret = rmdir(tempdir);