/mandos/trunk : revision 589.1.1

9

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

10

*

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* Everything else is

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13

12

13

14

*

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* 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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*

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

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

30

*/

31

32

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

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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 */

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

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inet_pton(), connect() */

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

73

*/

74

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

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

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setgid(), pause() */

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setgid(), pause(), _exit() */

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

78

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

79

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

85

raise() */

86

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

89

WEXITSTATUS(), WTERMSIG() */

90

#include <grp.h> /* setgroups() */

88

91

89

92

#ifdef __linux__

90

93

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

108

111

init_gnutls_session(),

109

112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

113

116

114

117

/* GPGME */

115

118

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

123

126

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

124

127

#define SECKEY "seckey.txt"

125

128

#define PUBKEY "pubkey.txt"

129

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

126

130

127

131

bool debug = false;

128

132

static const char mandos_protocol_version[] = "1";

129

133

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

130

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

134

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

131

135

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

132

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

133

138

134

139

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

135

140

typedef struct server{

165

170

166

171

/* Function to use when printing errors */

167

172

void perror_plus(const char *print_text){

173

int e = errno;

168

174

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

169

175

program_invocation_short_name);

176

errno = e;

170

177

perror(print_text);

171

178

}

172

179

180

__attribute__((format (gnu_printf, 2, 3)))

181

int fprintf_plus(FILE *stream, const char *format, ...){

182

va_list ap;

183

va_start (ap, format);

184

185

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

186

program_invocation_short_name));

187

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

188

}

189

173

190

/*

174

191

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

175

192

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

176

193

* "buffer_length" is how much is already used.

177

194

*/

178

195

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

196

size_t buffer_capacity){

180

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

198

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

182

199

if(buffer == NULL){

188

205

}

189

206

190

207

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

208

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

209

int af){

194

210

int ret;

195

211

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

196

212

if(new_server == NULL){

197

213

perror_plus("malloc");

198

return -1;

214

return false;

199

215

}

200

216

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

217

.port = port,

218

.if_index = if_index,

219

.af = af };

204

220

if(new_server->ip == NULL){

205

221

perror_plus("strdup");

206

return -1;

222

return false;

207

223

}

208

224

/* Special case of first server */

209

225

if (mc.current_server == NULL){

220

236

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

221

237

if(ret == -1){

222

238

perror_plus("clock_gettime");

223

return -1;

239

return false;

224

240

}

225

return 0;

241

return true;

226

242

}

227

243

228

244

/*

229

245

* Initialize GPGME.

230

246

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

233

249

gpgme_error_t rc;

234

250

gpgme_engine_info_t engine_info;

235

251

250

266

251

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

268

if(rc != GPG_ERR_NO_ERROR){

253

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

254

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

255

271

return false;

256

272

}

257

273

258

274

rc = gpgme_op_import(mc.ctx, pgp_data);

259

275

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

262

278

return false;

263

279

}

264

280

271

287

}

272

288

273

289

if(debug){

274

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

290

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

275

291

}

276

292

277

293

/* Init GPGME */

278

294

gpgme_check_version(NULL);

279

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

296

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

283

299

return false;

284

300

}

285

301

286

302

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

287

303

rc = gpgme_get_engine_info(&engine_info);

288

304

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

291

307

return false;

292

308

}

293

309

while(engine_info != NULL){

299

315

engine_info = engine_info->next;

300

316

}

301

317

if(engine_info == NULL){

302

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

318

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

319

tempdir);

303

320

return false;

304

321

}

305

322

306

323

/* Create new GPGME "context" */

307

324

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

308

325

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

311

329

return false;

312

330

}

313

331

332

350

ssize_t plaintext_length = 0;

333

351

334

352

if(debug){

335

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

353

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

336

354

}

337

355

338

356

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

339

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

358

0);

341

359

if(rc != GPG_ERR_NO_ERROR){

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

344

362

return -1;

345

363

}

346

364

347

365

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

348

366

rc = gpgme_data_new(&dh_plain);

349

367

if(rc != GPG_ERR_NO_ERROR){

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

352

371

gpgme_data_release(dh_crypto);

353

372

return -1;

354

373

}

357

376

data buffer */

358

377

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

359

378

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

362

381

plaintext_length = -1;

363

382

if(debug){

364

383

gpgme_decrypt_result_t result;

365

384

result = gpgme_op_decrypt_result(mc.ctx);

366

385

if(result == NULL){

367

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

386

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

368

387

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

373

392

if(result->file_name != NULL){

374

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

393

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

375

394

}

376

395

gpgme_recipient_t recipient;

377

396

recipient = result->recipients;

378

397

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

385

405

recipient = recipient->next;

386

406

}

387

407

}

390

410

}

391

411

392

412

if(debug){

393

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

413

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

394

414

}

395

415

396

416

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

403

423

*plaintext = NULL;

404

424

while(true){

405

425

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

408

428

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

412

432

}

413

433

414

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

447

}

428

448

429

449

if(debug){

430

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

450

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

431

451

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

432

452

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

433

453

}

455

475

/* GnuTLS log function callback */

456

476

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

457

477

const char* string){

458

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

478

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

459

479

}

460

480

461

481

static int init_gnutls_global(const char *pubkeyfilename,

463

483

int ret;

464

484

465

485

if(debug){

466

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

486

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

467

487

}

468

488

469

489

ret = gnutls_global_init();

470

490

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

473

493

return -1;

474

494

}

475

495

484

504

/* OpenPGP credentials */

485

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

506

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

489

509

gnutls_global_deinit();

490

510

return -1;

491

511

}

492

512

493

513

if(debug){

494

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

495

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

496

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

497

518

}

498

519

499

520

ret = gnutls_certificate_set_openpgp_key_file

500

521

(mc.cred, pubkeyfilename, seckeyfilename,

501

522

GNUTLS_OPENPGP_FMT_BASE64);

502

523

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

508

529

goto globalfail;

509

530

}

510

531

511

532

/* GnuTLS server initialization */

512

533

ret = gnutls_dh_params_init(&mc.dh_params);

513

534

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

516

538

goto globalfail;

517

539

}

518

540

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

519

541

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

522

544

goto globalfail;

523

545

}

524

546

544

566

}

545

567

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

546

568

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

549

572

}

550

573

551

574

{

558

581

}

559

582

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

560

583

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

564

587

gnutls_deinit(*session);

565

588

return -1;

566

589

}

575

598

}

576

599

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

577

600

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

580

603

gnutls_deinit(*session);

581

604

return -1;

582

605

}

627

650

pf = PF_INET;

628

651

break;

629

652

default:

630

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

653

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

631

654

errno = EINVAL;

632

655

return -1;

633

656

}

638

661

}

639

662

640

663

if(debug){

641

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

642

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

643

666

}

644

667

645

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

671

694

}

672

695

if(ret == 0){

673

696

int e = errno;

674

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

697

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

675

698

errno = e;

676

699

goto mandos_end;

677

700

}

682

705

683

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

707

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

685

-Wunreachable-code*/

708

-Wunreachable-code*/

686

709

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

689

712

errno = EINVAL;

690

713

goto mandos_end;

691

714

}

709

732

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

710

733

perror_plus("if_indextoname");

711

734

} else {

712

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

713

ip, interface, port);

735

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

736

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

714

737

}

715

738

} else {

716

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

717

port);

739

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

740

ip, port);

718

741

}

719

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

753

perror_plus("inet_ntop");

731

754

} else {

732

755

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

733

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

756

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

734

757

}

735

758

}

736

759

}

764

787

while(true){

765

788

size_t out_size = strlen(out);

766

789

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

767

out_size - written));

790

out_size - written));

768

791

if(ret == -1){

769

792

int e = errno;

770

793

perror_plus("write");

790

813

}

791

814

792

815

if(debug){

793

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

816

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

794

817

}

795

818

796

819

if(quit_now){

798

821

goto mandos_end;

799

822

}

800

823

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

/* This casting via intptr_t is to eliminate warning about casting

825

an int to a pointer type. This is exactly how the GnuTLS Guile

826

function "set-session-transport-fd!" does it. */

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

803

829

804

830

if(quit_now){

805

831

errno = EINTR;

816

842

817

843

if(ret != GNUTLS_E_SUCCESS){

818

844

if(debug){

819

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

845

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

820

846

gnutls_perror(ret);

821

847

}

822

848

errno = EPROTO;

826

852

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

827

853

828

854

if(debug){

829

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

830

ip);

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

831

857

}

832

858

833

859

while(true){

838

864

}

839

865

840

866

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

867

buffer_capacity);

842

868

if(buffer_capacity == 0){

843

869

int e = errno;

844

870

perror_plus("incbuffer");

871

897

}

872

898

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

873

899

if(ret < 0){

874

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

900

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

901

"***\n");

875

902

gnutls_perror(ret);

876

903

errno = EPROTO;

877

904

goto mandos_end;

878

905

}

879

906

break;

880

907

default:

881

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

882

" encrypted session with Mandos server\n");

908

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

909

" encrypted session with Mandos server\n");

883

910

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

911

errno = EIO;

885

912

goto mandos_end;

890

917

}

891

918

892

919

if(debug){

893

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

920

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

894

921

}

895

922

896

923

if(quit_now){

908

935

909

936

if(buffer_length > 0){

910

937

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

939

&decrypted_buffer);

914

940

if(decrypted_buffer_size >= 0){

915

941

926

952

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

927

953

int e = errno;

928

954

if(debug){

929

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

930

strerror(errno));

955

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

956

strerror(errno));

931

957

}

932

958

errno = e;

933

959

goto mandos_end;

990

1016

switch(event){

991

1017

default:

992

1018

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

996

1023

break;

997

1024

998

1025

case AVAHI_RESOLVER_FOUND:

1000

1027

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1028

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

1002

1029

if(debug){

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1030

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

1031

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

1032

host_name, ip, (intmax_t)interface, port);

1006

1033

}

1007

1034

int ret = start_mandos_communication(ip, port, interface,

1008

1035

avahi_proto_to_af(proto));

1009

1036

if(ret == 0){

1010

1037

avahi_simple_poll_quit(mc.simple_poll);

1011

1038

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1042

" list\n", name);

1043

}

1014

1044

}

1015

1045

}

1016

1046

}

1040

1070

default:

1041

1071

case AVAHI_BROWSER_FAILURE:

1042

1072

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1045

1075

avahi_simple_poll_quit(mc.simple_poll);

1046

1076

return;

1047

1077

1054

1084

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

1055

1085

name, type, domain, protocol, 0,

1056

1086

resolve_callback, NULL) == NULL)

1057

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

1058

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

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1059

1090

break;

1060

1091

1061

1092

case AVAHI_BROWSER_REMOVE:

1064

1095

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1096

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1097

if(debug){

1067

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

1098

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

1099

" searching...\n");

1068

1100

}

1069

1101

break;

1070

1102

}

1085

1117

errno = old_errno;

1086

1118

}

1087

1119

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1120

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

1121

int ret;

1122

1123

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

1124

if(s < 0){

1125

perror_plus("socket");

1126

return false;

1127

}

1128

strcpy(ifr->ifr_name, ifname);

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

if(ret == -1){

1144

1131

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1132

perror_plus("ioctl SIOCGIFFLAGS");

1147

1133

}

1148

free(flagstring);

1149

return 0;

1134

return false;

1150

1135

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1136

return true;

1137

}

1138

1139

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

1140

1153

1141

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1143

if(debug){

1156

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

1157

if_entry->d_name);

1144

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

1145

ifname);

1158

1146

}

1159

return 0;

1147

return false;

1160

1148

}

1161

1149

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

1162

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

1150

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

1163

1151

if(debug){

1164

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

1165

if_entry->d_name);

1152

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

1153

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

1166

1154

}

1167

return 1;

1155

return true;

1168

1156

}

1169

1157

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

1170

if(not (flags & IFF_BROADCAST)){

1158

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

1171

1159

if(debug){

1172

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

1173

if_entry->d_name);

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1174

1162

}

1175

return 0;

1163

return false;

1176

1164

}

1177

1165

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

1178

if(flags & IFF_NOARP){

1166

if(ifr->ifr_flags & IFF_NOARP){

1179

1167

if(debug){

1180

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

1181

if_entry->d_name);

1168

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

1169

ifname);

1182

1170

}

1183

return 0;

1171

return false;

1184

1172

}

1173

1185

1174

/* Accept this device */

1186

1175

if(debug){

1187

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

1188

if_entry->d_name);

1176

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

1177

}

1178

return true;

1179

}

1180

1181

/*

1182

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

1183

* corresponds to an acceptable network device.

1184

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

1185

*/

1186

int good_interface(const struct dirent *if_entry){

1187

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

1188

return 0;

1189

}

1190

1191

struct ifreq ifr;

1192

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

1193

if(debug){

1194

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

1195

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

1196

}

1197

return 0;

1198

}

1199

1200

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

1201

return 0;

1202

}

1203

return 1;

1204

}

1205

1206

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1189

1245

}

1190

1246

return 1;

1191

1247

}

1201

1257

return 1;

1202

1258

}

1203

1259

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1204

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1322

int ret;

1206

1323

struct timespec now;

1210

1327

while(true){

1211

1328

if(mc.current_server == NULL){

1212

1329

if (debug){

1213

fprintf(stderr,

1214

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

1330

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

1331

" No timeout!\n");

1215

1332

}

1216

1333

ret = avahi_simple_poll_iterate(s, -1);

1217

1334

} else {

1218

1335

if (debug){

1219

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

1220

" or wait\n");

1336

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

1337

" it, or wait\n");

1221

1338

}

1222

1339

/* the current time */

1223

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1239

1356

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

1240

1357

1241

1358

if (debug){

1242

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

1359

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

1360

block_time);

1243

1361

}

1244

1362

1245

1363

if(block_time <= 0){

1265

1383

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

1266

1384

}

1267

1385

if(ret != 0){

1268

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

1386

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

1269

1387

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

1270

1388

}

1271

1389

}

1272

1390

}

1273

1391

}

1274

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

ret = setenv("CONNECT", connect_to, 1);

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1527

}

1528

1275

1529

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

1276

1530

AvahiSServiceBrowser *sb = NULL;

1277

1531

int error;

1357

1611

.group = 2 },

1358

1612

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

1359

1613

.arg = "SECONDS",

1360

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

1614

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

1615

.group = 2 },

1616

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

1617

.arg = "DIR",

1618

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

1361

1619

.group = 2 },

1362

1620

/*

1363

1621

* These reproduce what we would get without ARGP_NO_HELP

1417

1675

argp_error(state, "Bad retry interval");

1418

1676

}

1419

1677

break;

1678

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

1679

hookdir = arg;

1680

break;

1420

1681

/*

1421

1682

* These reproduce what we would get without ARGP_NO_HELP

1422

1683

*/

1428

1689

argp_state_help(state, state->out_stream,

1429

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1691

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

1431

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

1692

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

1432

1693

exit(argp_err_exit_status);

1433

1694

break;

1434

1695

default:

1461

1722

{

1462

1723

/* Work around Debian bug #633582:

1463

1724

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

1464

struct stat st;

1465

1725

1466

1726

/* Re-raise priviliges */

1467

1727

errno = 0;

1468

1728

ret = seteuid(0);

1469

1729

if(ret == -1){

1470

1730

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

1731

} else {

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1782

}

1783

}

1784

1785

/* Run network hooks */

1786

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

1787

goto end;

1519

1788

}

1520

1789

1521

1790

if(not debug){

1522

1791

avahi_set_log_function(empty_log);

1523

1792

}

1524

1793

1525

1794

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

1526

1795

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1529

1805

if(ret >= 1){

1530

/* Pick the first good interface */

1806

/* Pick the first interface returned */

1531

1807

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

1532

1808

if(debug){

1533

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

1809

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

1534

1810

}

1535

1811

if(interface == NULL){

1536

1812

perror_plus("malloc");

1541

1817

free(direntries);

1542

1818

} else {

1543

1819

free(direntries);

1544

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

1820

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

1545

1821

exitcode = EXIT_FAILURE;

1546

1822

goto end;

1547

1823

}

1553

1829

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

1554

1830

mc.simple_poll = avahi_simple_poll_new();

1555

1831

if(mc.simple_poll == NULL){

1556

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

1832

fprintf_plus(stderr,

1833

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

1557

1834

exitcode = EX_UNAVAILABLE;

1558

1835

goto end;

1559

1836

}

1625

1902

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

1626

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1904

if(if_index == 0){

1628

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

1905

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

1629

1906

exitcode = EX_UNAVAILABLE;

1630

1907

goto end;

1631

1908

}

1751

2028

#endif /* __linux__ */

1752

2029

/* Lower privileges */

1753

2030

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1766

2035

}

1767

2036

}

1768

2037

1772

2041

1773

2042

ret = init_gnutls_global(pubkey, seckey);

1774

2043

if(ret == -1){

1775

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

2044

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

1776

2045

exitcode = EX_UNAVAILABLE;

1777

2046

goto end;

1778

2047

} else {

1794

2063

}

1795

2064

1796

2065

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

1797

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

2066

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

1798

2067

exitcode = EX_UNAVAILABLE;

1799

2068

goto end;

1800

2069

} else {

1810

2079

/* (Mainly meant for debugging) */

1811

2080

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

1812

2081

if(address == NULL){

1813

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

2082

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

1814

2083

exitcode = EX_USAGE;

1815

2084

goto end;

1816

2085

}

1824

2093

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

1825

2094

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

1826

2095

or tmpmax != (uint16_t)tmpmax){

1827

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

2096

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

1828

2097

exitcode = EX_USAGE;

1829

2098

goto end;

1830

2099

}

1860

2129

break;

1861

2130

}

1862

2131

if(debug){

1863

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

1864

(int)retry_interval);

2132

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

2133

(int)retry_interval);

1865

2134

}

1866

2135

sleep((int)retry_interval);

1867

2136

}

1869

2138

if (not quit_now){

1870

2139

exitcode = EXIT_SUCCESS;

1871

2140

}

1872

2141

1873

2142

goto end;

1874

2143

}

1875

2144

1897

2166

1898

2167

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

1899

2168

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2169

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

2170

avahi_strerror(error));

1902

2171

exitcode = EX_UNAVAILABLE;

1903

2172

goto end;

1904

2173

}

1912

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2182

NULL, 0, browse_callback, NULL);

1914

2183

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

1917

2186

exitcode = EX_UNAVAILABLE;

1918

2187

goto end;

1919

2188

}

1925

2194

/* Run the main loop */

1926

2195

1927

2196

if(debug){

1928

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

2197

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

1929

2198

}

1930

2199

1931

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2201

(int)(retry_interval * 1000));

1933

2202

if(debug){

1934

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

1935

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

2203

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

2204

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

1936

2205

}

1937

2206

1938

2207

end:

1939

2208

1940

2209

if(debug){

1941

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

2210

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

1942

2211

}

1943

2212

1944

2213

/* Cleanup things */

1960

2229

if(gpgme_initialized){

1961

2230

gpgme_release(mc.ctx);

1962

2231

}

1963

2232

1964

2233

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

1965

2234

has seen */

1966

2235

if(mc.current_server != NULL){

1972

2241

}

1973

2242

}

1974

2243

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2248

{

1978

2249

errno = 0;

1979

2250

ret = seteuid(0);

1980

2251

if(ret == -1){

1981

2252

perror_plus("seteuid");

1982

2253

}

1983

if(geteuid() == 0){

2254

2255

/* Take down the network interface */

2256

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

1984

2257

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

1985

2258

if(ret == -1){

1986

2259

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2260

} else if(network.ifr_flags & IFF_UP){

1988

2261

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

1989

2262

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

1990

2263

if(ret == -1){

1995

2268

if(ret == -1){

1996

2269

perror_plus("close");

1997

2270

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2004

2271

}

2005

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2006

2279

2007

2280

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

2008

2281

if(tempdir_created){

2022

2295

}

2023

2296

ret = remove(fullname);

2024

2297

if(ret == -1){

2025

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

2026

strerror(errno));

2298

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

2299

strerror(errno));

2027

2300

}

2028

2301

free(fullname);

2029

2302

}