/mandos/release : revision 237.16.3

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* "browse_callback", and parts of "main".

10

*

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* Everything else is

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13

12

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*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

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* along with this program. If not, see

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

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*

29

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

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno */

66

#include <time.h> /* nanosleep(), time() */

65

#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

67

#include <time.h> /* nanosleep(), time(), sleep() */

67

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

69

SIOCSIFFLAGS, if_indextoname(),

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70

if_nametoindex(), IF_NAMESIZE */

73

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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getuid(), getgid(), seteuid(),

75

76

setgid(), pause() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

84

85

raise() */

85

86

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

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

87

90

88

91

#ifdef __linux__

89

92

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

122

125

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

123

126

#define SECKEY "seckey.txt"

124

127

#define PUBKEY "pubkey.txt"

128

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

125

129

126

130

bool debug = false;

127

131

static const char mandos_protocol_version[] = "1";

128

132

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

129

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

133

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

134

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

135

char *connect_to = NULL;

136

137

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

138

typedef struct server{

139

const char *ip;

140

uint16_t port;

141

AvahiIfIndex if_index;

142

int af;

143

struct timespec last_seen;

144

struct server *next;

145

struct server *prev;

146

} server;

130

147

131

148

/* Used for passing in values through the Avahi callback functions */

132

149

typedef struct {

137

154

gnutls_dh_params_t dh_params;

138

155

const char *priority;

139

156

gpgme_ctx_t ctx;

157

server *current_server;

140

158

} mandos_context;

141

159

142

160

/* global context so signal handler can reach it*/

143

161

mandos_context mc = { .simple_poll = NULL, .server = NULL,

144

162

.dh_bits = 1024, .priority = "SECURE256"

145

":!CTYPE-X.509:+CTYPE-OPENPGP" };

163

":!CTYPE-X.509:+CTYPE-OPENPGP",

164

.current_server = NULL };

146

165

147

166

sig_atomic_t quit_now = 0;

148

167

int signal_received = 0;

149

168

169

/* Function to use when printing errors */

170

void perror_plus(const char *print_text){

171

fprintf(stderr, "Mandos plugin %s: ",

172

program_invocation_short_name);

173

perror(print_text);

174

}

175

150

176

/*

151

177

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

152

178

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

164

190

return buffer_capacity;

165

191

}

166

192

193

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

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

197

int ret;

198

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

199

if(new_server == NULL){

200

perror_plus("malloc");

201

return -1;

202

}

203

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

207

if(new_server->ip == NULL){

208

perror_plus("strdup");

209

return -1;

210

}

211

/* Special case of first server */

212

if (mc.current_server == NULL){

213

new_server->next = new_server;

214

new_server->prev = new_server;

215

mc.current_server = new_server;

216

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

217

} else {

218

new_server->next = mc.current_server;

219

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

220

new_server->prev->next = new_server;

221

mc.current_server->prev = new_server;

222

}

223

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

224

if(ret == -1){

225

perror_plus("clock_gettime");

226

return -1;

227

}

228

return 0;

229

}

230

167

231

/*

168

232

* Initialize GPGME.

169

233

*/

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184

248

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

185

249

if(fd == -1){

186

perror("open");

250

perror_plus("open");

187

251

return false;

188

252

}

189

253

190

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

255

if(rc != GPG_ERR_NO_ERROR){

192

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

256

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

257

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

193

258

gpgme_strsource(rc), gpgme_strerror(rc));

194

259

return false;

195

260

}

196

261

197

262

rc = gpgme_op_import(mc.ctx, pgp_data);

198

263

if(rc != GPG_ERR_NO_ERROR){

199

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

264

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

265

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

200

266

gpgme_strsource(rc), gpgme_strerror(rc));

201

267

return false;

202

268

}

203

269

204

270

ret = (int)TEMP_FAILURE_RETRY(close(fd));

205

271

if(ret == -1){

206

perror("close");

272

perror_plus("close");

207

273

}

208

274

gpgme_data_release(pgp_data);

209

275

return true;

210

276

}

211

277

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if(debug){

213

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

279

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

280

"Initializing GPGME\n");

214

281

}

215

282

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/* Init GPGME */

217

284

gpgme_check_version(NULL);

218

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

286

if(rc != GPG_ERR_NO_ERROR){

220

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

287

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

288

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

221

289

gpgme_strsource(rc), gpgme_strerror(rc));

222

290

return false;

223

291

}

224

292

225

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

293

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

226

294

rc = gpgme_get_engine_info(&engine_info);

227

295

if(rc != GPG_ERR_NO_ERROR){

228

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

296

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

297

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

229

298

gpgme_strsource(rc), gpgme_strerror(rc));

230

299

return false;

231

300

}

238

307

engine_info = engine_info->next;

239

308

}

240

309

if(engine_info == NULL){

241

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

310

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

311

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

242

312

return false;

243

313

}

244

314

245

315

/* Create new GPGME "context" */

246

316

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

247

317

if(rc != GPG_ERR_NO_ERROR){

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

318

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

319

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

320

gpgme_strerror(rc));

250

321

return false;

251

322

}

252

323

271

342

ssize_t plaintext_length = 0;

272

343

273

344

if(debug){

274

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

345

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

346

"Trying to decrypt OpenPGP data\n");

275

347

}

276

348

277

349

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

278

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

351

0);

280

352

if(rc != GPG_ERR_NO_ERROR){

281

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

353

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

354

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

282

355

gpgme_strsource(rc), gpgme_strerror(rc));

283

356

return -1;

284

357

}

286

359

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

287

360

rc = gpgme_data_new(&dh_plain);

288

361

if(rc != GPG_ERR_NO_ERROR){

289

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

362

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

363

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

290

364

gpgme_strsource(rc), gpgme_strerror(rc));

291

365

gpgme_data_release(dh_crypto);

292

366

return -1;

296

370

data buffer */

297

371

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

298

372

if(rc != GPG_ERR_NO_ERROR){

299

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

373

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

374

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

300

375

gpgme_strsource(rc), gpgme_strerror(rc));

301

376

plaintext_length = -1;

302

377

if(debug){

303

378

gpgme_decrypt_result_t result;

304

379

result = gpgme_op_decrypt_result(mc.ctx);

305

380

if(result == NULL){

306

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

381

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

382

"gpgme_op_decrypt_result failed\n");

307

383

} else {

308

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

384

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

385

"Unsupported algorithm: %s\n",

309

386

result->unsupported_algorithm);

310

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

387

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

388

"Wrong key usage: %u\n",

311

389

result->wrong_key_usage);

312

390

if(result->file_name != NULL){

313

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

391

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

392

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

314

393

}

315

394

gpgme_recipient_t recipient;

316

395

recipient = result->recipients;

317

396

while(recipient != NULL){

318

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

397

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

398

"Public key algorithm: %s\n",

319

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

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",

322

404

recipient->status == GPG_ERR_NO_SECKEY

323

405

? "No" : "Yes");

324

406

recipient = recipient->next;

329

411

}

330

412

331

413

if(debug){

332

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

333

416

}

334

417

335

418

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

336

419

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

337

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

338

421

plaintext_length = -1;

339

422

goto decrypt_end;

340

423

}

345

428

(size_t)plaintext_length,

346

429

plaintext_capacity);

347

430

if(plaintext_capacity == 0){

348

perror("incbuffer");

431

perror_plus("incbuffer");

349

432

plaintext_length = -1;

350

433

goto decrypt_end;

351

434

}

358

441

break;

359

442

}

360

443

if(ret < 0){

361

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

362

445

plaintext_length = -1;

363

446

goto decrypt_end;

364

447

}

366

449

}

367

450

368

451

if(debug){

369

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

452

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

453

"Decrypted password is: ");

370

454

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

371

455

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

372

456

}

394

478

/* GnuTLS log function callback */

395

479

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

396

480

const char* string){

397

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

481

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

398

482

}

399

483

400

484

static int init_gnutls_global(const char *pubkeyfilename,

402

486

int ret;

403

487

404

488

if(debug){

405

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

489

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

490

"Initializing GnuTLS\n");

406

491

}

407

492

408

493

ret = gnutls_global_init();

409

494

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

495

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

496

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

412

497

return -1;

413

498

}

414

499

421

506

}

422

507

423

508

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

510

if(ret != GNUTLS_E_SUCCESS){

426

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

511

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

512

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

431

513

gnutls_global_deinit();

432

514

return -1;

433

515

}

434

516

435

517

if(debug){

436

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

518

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

519

"Attempting to use OpenPGP public key %s and"

437

520

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

438

521

seckeyfilename);

439

522

}

443

526

GNUTLS_OPENPGP_FMT_BASE64);

444

527

if(ret != GNUTLS_E_SUCCESS){

445

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

446

530

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

447

531

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

448

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

449

safer_gnutls_strerror(ret));

532

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

533

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

450

534

goto globalfail;

451

535

}

452

536

453

537

/* GnuTLS server initialization */

454

538

ret = gnutls_dh_params_init(&mc.dh_params);

455

539

if(ret != GNUTLS_E_SUCCESS){

456

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

540

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

541

"Error in GnuTLS DH parameter initialization:"

457

542

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

458

543

goto globalfail;

459

544

}

460

545

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

461

546

if(ret != GNUTLS_E_SUCCESS){

462

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

547

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

548

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

463

549

safer_gnutls_strerror(ret));

464

550

goto globalfail;

465

551

}

486

572

}

487

573

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

488

574

if(ret != GNUTLS_E_SUCCESS){

489

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

575

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

576

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

490

577

safer_gnutls_strerror(ret));

491

578

}

492

579

500

587

}

501

588

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

502

589

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

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));

506

594

gnutls_deinit(*session);

507

595

return -1;

508

596

}

517

605

}

518

606

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

519

607

if(ret != GNUTLS_E_SUCCESS){

520

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

608

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

609

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

521

610

safer_gnutls_strerror(ret));

522

611

gnutls_deinit(*session);

523

612

return -1;

569

658

pf = PF_INET;

570

659

break;

571

660

default:

572

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

661

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

662

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

573

663

errno = EINVAL;

574

664

return -1;

575

665

}

580

670

}

581

671

582

672

if(debug){

583

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

673

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

674

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

584

675

"\n", ip, port);

585

676

}

586

677

587

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

679

if(tcp_sd < 0){

589

680

int e = errno;

590

perror("socket");

681

perror_plus("socket");

591

682

errno = e;

592

683

goto mandos_end;

593

684

}

607

698

}

608

699

if(ret < 0 ){

609

700

int e = errno;

610

perror("inet_pton");

701

perror_plus("inet_pton");

611

702

errno = e;

612

703

goto mandos_end;

613

704

}

614

705

if(ret == 0){

615

706

int e = errno;

616

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

707

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

708

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

617

709

errno = e;

618

710

goto mandos_end;

619

711

}

626

718

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

627

719

-Wunreachable-code*/

628

720

if(if_index == AVAHI_IF_UNSPEC){

629

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

721

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

722

"An IPv6 link-local address is incomplete"

630

723

" without a network interface\n");

631

724

errno = EINVAL;

632

725

goto mandos_end;

649

742

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

650

743

char interface[IF_NAMESIZE];

651

744

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

652

perror("if_indextoname");

745

perror_plus("if_indextoname");

653

746

} else {

654

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

747

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

748

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

655

749

ip, interface, port);

656

750

}

657

751

} else {

658

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

659

port);

752

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

753

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

660

754

}

661

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

669

763

sizeof(addrstr));

670

764

}

671

765

if(pcret == NULL){

672

perror("inet_ntop");

766

perror_plus("inet_ntop");

673

767

} else {

674

768

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

675

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

769

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

770

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

676

771

}

677

772

}

678

773

}

688

783

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

689

784

}

690

785

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

786

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

787

int e = errno;

788

perror_plus("connect");

789

errno = e;

790

}

694

791

goto mandos_end;

695

792

}

696

793

707

804

out_size - written));

708

805

if(ret == -1){

709

806

int e = errno;

710

perror("write");

807

perror_plus("write");

711

808

errno = e;

712

809

goto mandos_end;

713

810

}

730

827

}

731

828

732

829

if(debug){

733

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

830

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

831

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

734

832

}

735

833

736

834

if(quit_now){

738

836

goto mandos_end;

739

837

}

740

838

839

/* Spurious warning from -Wint-to-pointer-cast */

741

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

841

743

842

if(quit_now){

755

854

756

855

if(ret != GNUTLS_E_SUCCESS){

757

856

if(debug){

758

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

857

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

858

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

759

859

gnutls_perror(ret);

760

860

}

761

861

errno = EPROTO;

765

865

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

766

866

767

867

if(debug){

768

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

769

ip);

868

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

869

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

770

870

}

771

871

772

872

while(true){

780

880

buffer_capacity);

781

881

if(buffer_capacity == 0){

782

882

int e = errno;

783

perror("incbuffer");

883

perror_plus("incbuffer");

784

884

errno = e;

785

885

goto mandos_end;

786

886

}

810

910

}

811

911

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

812

912

if(ret < 0){

813

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

913

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

914

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

814

915

gnutls_perror(ret);

815

916

errno = EPROTO;

816

917

goto mandos_end;

817

918

}

818

919

break;

819

920

default:

820

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

921

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

922

"Unknown error while reading data from"

821

923

" encrypted session with Mandos server\n");

822

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

925

errno = EIO;

829

931

}

830

932

831

933

if(debug){

832

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

934

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

935

"Closing TLS session\n");

833

936

}

834

937

835

938

if(quit_now){

865

968

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

866

969

int e = errno;

867

970

if(debug){

868

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

971

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

972

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

869

973

strerror(errno));

870

974

}

871

975

errno = e;

891

995

if(e == 0){

892

996

e = errno;

893

997

}

894

perror("close");

998

perror_plus("close");

895

999

}

896

1000

gnutls_deinit(session);

1001

errno = e;

897

1002

if(quit_now){

898

e = EINTR;

1003

errno = EINTR;

899

1004

retval = -1;

900

1005

}

901

errno = e;

902

1006

}

903

1007

return retval;

904

1008

}

929

1033

switch(event){

930

1034

default:

931

1035

case AVAHI_RESOLVER_FAILURE:

932

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

1036

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

1037

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

933

1038

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

934

1039

avahi_strerror(avahi_server_errno(mc.server)));

935

1040

break;

939

1044

char ip[AVAHI_ADDRESS_STR_MAX];

940

1045

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

941

1046

if(debug){

942

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

1047

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

1048

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

943

1049

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

944

1050

ip, (intmax_t)interface, port);

945

1051

}

947

1053

avahi_proto_to_af(proto));

948

1054

if(ret == 0){

949

1055

avahi_simple_poll_quit(mc.simple_poll);

1056

} else {

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

950

1059

}

951

1060

}

952

1061

}

976

1085

default:

977

1086

case AVAHI_BROWSER_FAILURE:

978

1087

979

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

1088

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

1089

"(Avahi browser) %s\n",

980

1090

avahi_strerror(avahi_server_errno(mc.server)));

981

1091

avahi_simple_poll_quit(mc.simple_poll);

982

1092

return;

990

1100

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

991

1101

name, type, domain, protocol, 0,

992

1102

resolve_callback, NULL) == NULL)

993

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

1103

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

1104

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

994

1105

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

995

1106

break;

996

1107

1000

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1113

if(debug){

1003

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

1114

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

1115

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

1004

1116

}

1005

1117

break;

1006

1118

}

1007

1119

}

1008

1120

1009

/* stop main loop after sigterm has been called */

1121

/* Signal handler that stops main loop after SIGTERM */

1010

1122

static void handle_sigterm(int sig){

1011

1123

if(quit_now){

1012

1124

return;

1014

1126

quit_now = 1;

1015

1127

signal_received = sig;

1016

1128

int old_errno = errno;

1129

/* set main loop to exit */

1017

1130

if(mc.simple_poll != NULL){

1018

1131

avahi_simple_poll_quit(mc.simple_poll);

1019

1132

}

1020

1133

errno = old_errno;

1021

1134

}

1022

1135

1136

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

1137

int ret;

1138

1139

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

1140

if(s < 0){

1141

perror_plus("socket");

1142

return false;

1143

}

1144

strcpy(ifr->ifr_name, ifname);

1145

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1146

if(ret == -1){

1147

if(debug){

1148

perror_plus("ioctl SIOCGIFFLAGS");

1149

}

1150

return false;

1151

}

1152

return true;

1153

}

1154

1155

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

1156

1157

/* Reject the loopback device */

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

if(debug){

1160

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

1161

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

1162

}

1163

return false;

1164

}

1165

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

1166

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

1167

if(debug){

1168

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

1169

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

1170

}

1171

return true;

1172

}

1173

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

1174

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

1175

if(debug){

1176

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

1177

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

1178

}

1179

return false;

1180

}

1181

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

1182

if(ifr->ifr_flags & IFF_NOARP){

1183

if(debug){

1184

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

1185

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

1186

}

1187

return false;

1188

}

1189

1190

/* Accept this device */

1191

if(debug){

1192

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

1193

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

1194

}

1195

return true;

1196

}

1197

1198

/*

1199

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

1200

* corresponds to an acceptable network device.

1201

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

1202

*/

1203

int good_interface(const struct dirent *if_entry){

1204

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

1205

return 0;

1206

}

1207

1208

struct ifreq ifr;

1209

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

1210

if(debug){

1211

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

1212

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

1213

if_entry->d_name);

1214

}

1215

return 0;

1216

}

1217

1218

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

1219

return 0;

1220

}

1221

return 1;

1222

}

1223

1224

/*

1225

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

1226

* corresponds to an acceptable network device which is up.

1227

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

1228

*/

1229

int up_interface(const struct dirent *if_entry){

1230

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

1231

return 0;

1232

}

1233

1234

struct ifreq ifr;

1235

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

1236

if(debug){

1237

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

1238

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

1239

if_entry->d_name);

1240

}

1241

return 0;

1242

}

1243

1244

/* Reject down interfaces */

1245

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

1246

if(debug){

1247

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

1248

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

1249

if_entry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

/* Reject non-running interfaces */

1255

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

1256

if(debug){

1257

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

1258

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

1259

if_entry->d_name);

1260

}

1261

return 0;

1262

}

1263

1264

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

1265

return 0;

1266

}

1267

return 1;

1268

}

1269

1270

int notdotentries(const struct dirent *direntry){

1271

/* Skip "." and ".." */

1272

if(direntry->d_name[0] == '.'

1273

and (direntry->d_name[1] == '\0'

1274

or (direntry->d_name[1] == '.'

1275

and direntry->d_name[2] == '\0'))){

1276

return 0;

1277

}

1278

return 1;

1279

}

1280

1281

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

1282

int runnable_hook(const struct dirent *direntry){

1283

int ret;

1284

struct stat st;

1285

1286

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

1287

/* Empty name? */

1288

return 0;

1289

}

1290

1291

/* Save pointer to last character */

1292

char *end = strchr(direntry->d_name, '\0')-1;

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

and (*end == '#')){

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

ret = stat(direntry->d_name, &st);

1308

if(ret == -1){

1309

if(debug){

1310

perror_plus("Could not stat plugin");

1311

}

1312

return 0;

1313

}

1314

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

1315

/* Not a regular file */

1316

return 0;

1317

}

1318

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

1319

/* Not executable */

1320

return 0;

1321

}

1322

return 1;

1323

}

1324

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1326

int ret;

1327

struct timespec now;

1328

struct timespec waited_time;

1329

intmax_t block_time;

1330

1331

while(true){

1332

if(mc.current_server == NULL){

1333

if (debug){

1334

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

1335

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

1336

}

1337

ret = avahi_simple_poll_iterate(s, -1);

1338

} else {

1339

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1343

}

1344

/* the current time */

1345

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1346

if(ret == -1){

1347

perror_plus("clock_gettime");

1348

return -1;

1349

}

1350

/* Calculating in ms how long time between now and server

1351

who we visted longest time ago. Now - last seen. */

1352

waited_time.tv_sec = (now.tv_sec

1353

- mc.current_server->last_seen.tv_sec);

1354

waited_time.tv_nsec = (now.tv_nsec

1355

- mc.current_server->last_seen.tv_nsec);

1356

/* total time is 10s/10,000ms.

1357

Converting to s from ms by dividing by 1,000,

1358

and ns to ms by dividing by 1,000,000. */

1359

block_time = ((retry_interval

1360

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

1361

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

1362

1363

if (debug){

1364

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

1365

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

1366

}

1367

1368

if(block_time <= 0){

1369

ret = start_mandos_communication(mc.current_server->ip,

1370

mc.current_server->port,

1371

mc.current_server->if_index,

1372

mc.current_server->af);

1373

if(ret == 0){

1374

avahi_simple_poll_quit(mc.simple_poll);

1375

return 0;

1376

}

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1378

&mc.current_server->last_seen);

1379

if(ret == -1){

1380

perror_plus("clock_gettime");

1381

return -1;

1382

}

1383

mc.current_server = mc.current_server->next;

1384

block_time = 0; /* Call avahi to find new Mandos

1385

servers, but don't block */

1386

}

1387

1388

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

1389

}

1390

if(ret != 0){

1391

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

1392

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

1393

}

1394

}

1395

}

1396

}

1397

1023

1398

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

1024

1399

AvahiSServiceBrowser *sb = NULL;

1025

1400

int error;

1027

1402

intmax_t tmpmax;

1028

1403

char *tmp;

1029

1404

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1405

const char *interface = "";

1031

1406

struct ifreq network;

1032

1407

int sd = -1;

1033

1408

bool take_down_interface = false;

1034

1409

uid_t uid;

1035

1410

gid_t gid;

1036

char *connect_to = NULL;

1037

1411

char tempdir[] = "/tmp/mandosXXXXXX";

1038

1412

bool tempdir_created = false;

1039

1413

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1043

1417

bool gnutls_initialized = false;

1044

1418

bool gpgme_initialized = false;

1045

1419

float delay = 2.5f;

1420

double retry_interval = 10; /* 10s between trying a server and

1421

retrying the same server again */

1046

1422

1047

1423

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1424

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1430

errno = 0;

1055

1431

ret = setgid(gid);

1056

1432

if(ret == -1){

1057

perror("setgid");

1433

perror_plus("setgid");

1058

1434

}

1059

1435

1060

1436

/* Lower user privileges (temporarily) */

1061

1437

errno = 0;

1062

1438

ret = seteuid(uid);

1063

1439

if(ret == -1){

1064

perror("seteuid");

1440

perror_plus("seteuid");

1065

1441

}

1066

1442

1067

1443

if(quit_now){

1102

1478

.arg = "SECONDS",

1103

1479

.doc = "Maximum delay to wait for interface startup",

1104

1480

.group = 2 },

1481

{ .name = "retry", .key = 132,

1482

.arg = "SECONDS",

1483

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

1484

.group = 2 },

1105

1485

/*

1106

1486

* These reproduce what we would get without ARGP_NO_HELP

1107

1487

*/

1151

1531

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

1152

1532

argp_error(state, "Bad delay");

1153

1533

}

1534

case 132: /* --retry */

1535

errno = 0;

1536

retry_interval = strtod(arg, &tmp);

1537

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

1538

or (retry_interval * 1000) > INT_MAX

1539

or retry_interval < 0){

1540

argp_error(state, "Bad retry interval");

1541

}

1154

1542

break;

1155

1543

/*

1156

1544

* These reproduce what we would get without ARGP_NO_HELP

1163

1551

argp_state_help(state, state->out_stream,

1164

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

1553

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

1554

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

1166

1555

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

1167

1556

exit(argp_err_exit_status);

1168

1557

break;

1184

1573

case ENOMEM:

1185

1574

default:

1186

1575

errno = ret;

1187

perror("argp_parse");

1576

perror_plus("argp_parse");

1188

1577

exitcode = EX_OSERR;

1189

1578

goto end;

1190

1579

case EINVAL:

1192

1581

goto end;

1193

1582

}

1194

1583

}

1584

1585

{

1586

/* Work around Debian bug #633582:

1587

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

1588

struct stat st;

1589

1590

/* Re-raise priviliges */

1591

errno = 0;

1592

ret = seteuid(0);

1593

if(ret == -1){

1594

perror_plus("seteuid");

1595

}

1596

1597

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

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

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

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

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

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

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

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

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

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

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

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1653

} else {

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

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

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

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

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

"Warning: network hook \"%s\" exited"

1711

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

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1719

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

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

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

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1737

}

1738

}

1195

1739

1196

1740

if(not debug){

1197

1741

avahi_set_log_function(empty_log);

1198

1742

}

1199

1743

1744

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

1745

struct dirent **direntries;

1746

/* First look for interfaces that are up */

1747

ret = scandir(sys_class_net, &direntries, up_interface,

1748

alphasort);

1749

if(ret == 0){

1750

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

1751

free(direntries);

1752

ret = scandir(sys_class_net, &direntries, good_interface,

1753

alphasort);

1754

}

1755

if(ret >= 1){

1756

/* Pick the first interface returned */

1757

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

1758

if(debug){

1759

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

1760

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

1761

}

1762

if(interface == NULL){

1763

perror_plus("malloc");

1764

free(direntries);

1765

exitcode = EXIT_FAILURE;

1766

goto end;

1767

}

1768

free(direntries);

1769

} else {

1770

free(direntries);

1771

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

1772

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

1773

exitcode = EXIT_FAILURE;

1774

goto end;

1775

}

1776

}

1777

1200

1778

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1201

1779

from the signal handler */

1202

1780

/* Initialize the pseudo-RNG for Avahi */

1203

1781

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

1204

1782

mc.simple_poll = avahi_simple_poll_new();

1205

1783

if(mc.simple_poll == NULL){

1206

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

1784

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

1785

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

1207

1786

exitcode = EX_UNAVAILABLE;

1208

1787

goto end;

1209

1788

}

1211

1790

sigemptyset(&sigterm_action.sa_mask);

1212

1791

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1213

1792

if(ret == -1){

1214

perror("sigaddset");

1793

perror_plus("sigaddset");

1215

1794

exitcode = EX_OSERR;

1216

1795

goto end;

1217

1796

}

1218

1797

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1219

1798

if(ret == -1){

1220

perror("sigaddset");

1799

perror_plus("sigaddset");

1221

1800

exitcode = EX_OSERR;

1222

1801

goto end;

1223

1802

}

1224

1803

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1225

1804

if(ret == -1){

1226

perror("sigaddset");

1805

perror_plus("sigaddset");

1227

1806

exitcode = EX_OSERR;

1228

1807

goto end;

1229

1808

}

1233

1812

*/

1234

1813

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1235

1814

if(ret == -1){

1236

perror("sigaction");

1815

perror_plus("sigaction");

1237

1816

return EX_OSERR;

1238

1817

}

1239

1818

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1819

ret = sigaction(SIGINT, &sigterm_action, NULL);

1241

1820

if(ret == -1){

1242

perror("sigaction");

1821

perror_plus("sigaction");

1243

1822

exitcode = EX_OSERR;

1244

1823

goto end;

1245

1824

}

1246

1825

}

1247

1826

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1248

1827

if(ret == -1){

1249

perror("sigaction");

1828

perror_plus("sigaction");

1250

1829

return EX_OSERR;

1251

1830

}

1252

1831

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1832

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1254

1833

if(ret == -1){

1255

perror("sigaction");

1834

perror_plus("sigaction");

1256

1835

exitcode = EX_OSERR;

1257

1836

goto end;

1258

1837

}

1259

1838

}

1260

1839

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1261

1840

if(ret == -1){

1262

perror("sigaction");

1841

perror_plus("sigaction");

1263

1842

return EX_OSERR;

1264

1843

}

1265

1844

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1845

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1267

1846

if(ret == -1){

1268

perror("sigaction");

1847

perror_plus("sigaction");

1269

1848

exitcode = EX_OSERR;

1270

1849

goto end;

1271

1850

}

1272

1851

}

1273

1852

1274

1853

/* If the interface is down, bring it up */

1275

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

1854

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

1276

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1856

if(if_index == 0){

1278

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

1857

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

1858

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

1279

1859

exitcode = EX_UNAVAILABLE;

1280

1860

goto end;

1281

1861

}

1288

1868

errno = 0;

1289

1869

ret = seteuid(0);

1290

1870

if(ret == -1){

1291

perror("seteuid");

1871

perror_plus("seteuid");

1292

1872

}

1293

1873

1294

1874

#ifdef __linux__

1298

1878

bool restore_loglevel = true;

1299

1879

if(ret == -1){

1300

1880

restore_loglevel = false;

1301

perror("klogctl");

1881

perror_plus("klogctl");

1302

1882

}

1303

1883

#endif /* __linux__ */

1304

1884

1305

1885

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1886

if(sd < 0){

1307

perror("socket");

1887

perror_plus("socket");

1308

1888

exitcode = EX_OSERR;

1309

1889

#ifdef __linux__

1310

1890

if(restore_loglevel){

1311

1891

ret = klogctl(7, NULL, 0);

1312

1892

if(ret == -1){

1313

perror("klogctl");

1893

perror_plus("klogctl");

1314

1894

}

1315

1895

}

1316

1896

#endif /* __linux__ */

1318

1898

errno = 0;

1319

1899

ret = seteuid(uid);

1320

1900

if(ret == -1){

1321

perror("seteuid");

1901

perror_plus("seteuid");

1322

1902

}

1323

1903

goto end;

1324

1904

}

1325

1905

strcpy(network.ifr_name, interface);

1326

1906

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

1327

1907

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1908

perror_plus("ioctl SIOCGIFFLAGS");

1329

1909

#ifdef __linux__

1330

1910

if(restore_loglevel){

1331

1911

ret = klogctl(7, NULL, 0);

1332

1912

if(ret == -1){

1333

perror("klogctl");

1913

perror_plus("klogctl");

1334

1914

}

1335

1915

}

1336

1916

#endif /* __linux__ */

1339

1919

errno = 0;

1340

1920

ret = seteuid(uid);

1341

1921

if(ret == -1){

1342

perror("seteuid");

1922

perror_plus("seteuid");

1343

1923

}

1344

1924

goto end;

1345

1925

}

1349

1929

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

1350

1930

if(ret == -1){

1351

1931

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1932

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1353

1933

exitcode = EX_OSERR;

1354

1934

#ifdef __linux__

1355

1935

if(restore_loglevel){

1356

1936

ret = klogctl(7, NULL, 0);

1357

1937

if(ret == -1){

1358

perror("klogctl");

1938

perror_plus("klogctl");

1359

1939

}

1360

1940

}

1361

1941

#endif /* __linux__ */

1363

1943

errno = 0;

1364

1944

ret = seteuid(uid);

1365

1945

if(ret == -1){

1366

perror("seteuid");

1946

perror_plus("seteuid");

1367

1947

}

1368

1948

goto end;

1369

1949

}

1370

1950

}

1371

/* sleep checking until interface is running */

1951

/* Sleep checking until interface is running.

1952

Check every 0.25s, up to total time of delay */

1372

1953

for(int i=0; i < delay * 4; i++){

1373

1954

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

1374

1955

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1956

perror_plus("ioctl SIOCGIFFLAGS");

1376

1957

} else if(network.ifr_flags & IFF_RUNNING){

1377

1958

break;

1378

1959

}

1379

1960

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

1961

ret = nanosleep(&sleeptime, NULL);

1381

1962

if(ret == -1 and errno != EINTR){

1382

perror("nanosleep");

1963

perror_plus("nanosleep");

1383

1964

}

1384

1965

}

1385

1966

if(not take_down_interface){

1386

1967

/* We won't need the socket anymore */

1387

1968

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1388

1969

if(ret == -1){

1389

perror("close");

1970

perror_plus("close");

1390

1971

}

1391

1972

}

1392

1973

#ifdef __linux__

1394

1975

/* Restores kernel loglevel to default */

1395

1976

ret = klogctl(7, NULL, 0);

1396

1977

if(ret == -1){

1397

perror("klogctl");

1978

perror_plus("klogctl");

1398

1979

}

1399

1980

}

1400

1981

#endif /* __linux__ */

1404

1985

/* Lower privileges */

1405

1986

ret = seteuid(uid);

1406

1987

if(ret == -1){

1407

perror("seteuid");

1988

perror_plus("seteuid");

1408

1989

}

1409

1990

} else {

1410

1991

/* Lower privileges permanently */

1411

1992

ret = setuid(uid);

1412

1993

if(ret == -1){

1413

perror("setuid");

1994

perror_plus("setuid");

1414

1995

}

1415

1996

}

1416

1997

}

1421

2002

1422

2003

ret = init_gnutls_global(pubkey, seckey);

1423

2004

if(ret == -1){

1424

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

2005

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

2006

"init_gnutls_global failed\n");

1425

2007

exitcode = EX_UNAVAILABLE;

1426

2008

goto end;

1427

2009

} else {

1432

2014

goto end;

1433

2015

}

1434

2016

2017

if(mkdtemp(tempdir) == NULL){

2018

perror_plus("mkdtemp");

2019

goto end;

2020

}

1435

2021

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

1439

goto end;

1440

}

1441

2022

1442

2023

if(quit_now){

1443

2024

goto end;

1444

2025

}

1445

2026

1446

2027

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

1447

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

2028

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

2029

"init_gpgme failed\n");

1448

2030

exitcode = EX_UNAVAILABLE;

1449

2031

goto end;

1450

2032

} else {

1460

2042

/* (Mainly meant for debugging) */

1461

2043

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

1462

2044

if(address == NULL){

1463

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

2045

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

2046

"No colon in address\n");

1464

2047

exitcode = EX_USAGE;

1465

2048

goto end;

1466

2049

}

1474

2057

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

1475

2058

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

1476

2059

or tmpmax != (uint16_t)tmpmax){

1477

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

2060

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

2061

"Bad port number\n");

1478

2062

exitcode = EX_USAGE;

1479

2063

goto end;

1480

2064

}

1485

2069

1486

2070

port = (uint16_t)tmpmax;

1487

2071

*address = '\0';

1488

address = connect_to;

1489

2072

/* Colon in address indicates IPv6 */

1490

2073

int af;

1491

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

2074

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

1492

2075

af = AF_INET6;

2076

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

2077

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

2078

{

2079

connect_to++;

2080

address[-1] = '\0';

2081

}

1493

2082

} else {

1494

2083

af = AF_INET;

1495

2084

}

2085

address = connect_to;

1496

2086

1497

2087

if(quit_now){

1498

2088

goto end;

1499

2089

}

1500

2090

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2091

while(not quit_now){

2092

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

2093

if(quit_now or ret == 0){

2094

break;

2095

}

2096

if(debug){

2097

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

2098

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

2099

}

2100

sleep((int)retry_interval);

2101

}

2102

2103

if (not quit_now){

1523

2104

exitcode = EXIT_SUCCESS;

1524

2105

}

2106

1525

2107

goto end;

1526

2108

}

1527

2109

1549

2131

1550

2132

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

1551

2133

if(mc.server == NULL){

1552

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

2134

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

2135

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

1553

2136

avahi_strerror(error));

1554

2137

exitcode = EX_UNAVAILABLE;

1555

2138

goto end;

1564

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

2148

NULL, 0, browse_callback, NULL);

1566

2149

if(sb == NULL){

1567

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

2150

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

2151

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

1568

2152

avahi_strerror(avahi_server_errno(mc.server)));

1569

2153

exitcode = EX_UNAVAILABLE;

1570

2154

goto end;

1577

2161

/* Run the main loop */

1578

2162

1579

2163

if(debug){

1580

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

1581

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2164

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

2165

"Starting Avahi loop search\n");

2166

}

2167

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

(int)(retry_interval * 1000));

2170

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2174

}

1584

2175

1585

2176

end:

1586

2177

1587

2178

if(debug){

1588

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

2179

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

2180

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

1589

2181

}

1590

2182

1591

2183

/* Cleanup things */

1607

2199

if(gpgme_initialized){

1608

2200

gpgme_release(mc.ctx);

1609

2201

}

2202

2203

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

2204

has seen */

2205

if(mc.current_server != NULL){

2206

mc.current_server->prev->next = NULL;

2207

while(mc.current_server != NULL){

2208

server *next = mc.current_server->next;

2209

free(mc.current_server);

2210

mc.current_server = next;

2211

}

2212

}

2213

2214

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

1610

2215

1611

2216

/* Take down the network interface */

1612

2217

if(take_down_interface){

1614

2219

errno = 0;

1615

2220

ret = seteuid(0);

1616

2221

if(ret == -1){

1617

perror("seteuid");

2222

perror_plus("seteuid");

1618

2223

}

1619

2224

if(geteuid() == 0){

1620

2225

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

1621

2226

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

2227

perror_plus("ioctl SIOCGIFFLAGS");

2228

} else if(network.ifr_flags & IFF_UP){

1624

2229

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

1625

2230

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

1626

2231

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

2232

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1628

2233

}

1629

2234

}

1630

2235

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1631

2236

if(ret == -1){

1632

perror("close");

2237

perror_plus("close");

1633

2238

}

1634

2239

/* Lower privileges permanently */

1635

2240

errno = 0;

1636

2241

ret = setuid(uid);

1637

2242

if(ret == -1){

1638

perror("setuid");

2243

perror_plus("setuid");

1639

2244

}

1640

2245

}

1641

2246

}

1642

2247

1643

/* Removes the temp directory used by GPGME */

2248

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

1644

2249

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

/* Skip "." and ".." */

1659

if(direntry->d_name[0] == '.'

1660

and (direntry->d_name[1] == '\0'

1661

or (direntry->d_name[1] == '.'

1662

and direntry->d_name[2] == '\0'))){

1663

continue;

1664

}

2250

struct dirent **direntries = NULL;

2251

struct dirent *direntry = NULL;

2252

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

2253

alphasort);

2254

if (numentries > 0){

2255

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

2256

direntry = direntries[i];

1665

2257

char *fullname = NULL;

1666

2258

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

1667

2259

direntry->d_name);

1668

2260

if(ret < 0){

1669

perror("asprintf");

2261

perror_plus("asprintf");

1670

2262

continue;

1671

2263

}

1672

2264

ret = remove(fullname);

1673

2265

if(ret == -1){

1674

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

1675

strerror(errno));

2266

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

2267

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

1676

2268

}

1677

2269

free(fullname);

1678

2270

}

1679

closedir(d);

2271

}

2272

2273

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

2274

free(direntries);

2275

if (numentries == -1){

2276

perror_plus("scandir");

1680

2277

}

1681

2278

ret = rmdir(tempdir);

1682

2279

if(ret == -1 and errno != ENOENT){

1683

perror("rmdir");

2280

perror_plus("rmdir");

1684

2281

}

1685

2282

}

1686

2283

1691

2288

&old_sigterm_action,

1692

2289

NULL));

1693

2290

if(ret == -1){

1694

perror("sigaction");

2291

perror_plus("sigaction");

1695

2292

}

1696

2293

do {

1697

2294

ret = raise(signal_received);

1698

2295

} while(ret != 0 and errno == EINTR);

1699

2296

if(ret != 0){

1700

perror("raise");

2297

perror_plus("raise");

1701

2298

abort();

1702

2299

}

1703

2300

TEMP_FAILURE_RETRY(pause());