/mandos/release : revision 237.12.6

9

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

10

*

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* Everything else is

12

13

12

13

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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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

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inet_pton(), connect() */

59

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

73

*/

74

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

75

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

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

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setgid(), pause() */

77

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

78

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

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#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 */

88

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

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WEXITSTATUS(), WTERMSIG() */

90

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

91

88

92

89

#ifdef __linux__

93

90

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

111

108

init_gnutls_session(),

112

109

GNUTLS_* */

113

110

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

116

113

117

114

/* GPGME */

118

115

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

126

123

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

127

124

#define SECKEY "seckey.txt"

128

125

#define PUBKEY "pubkey.txt"

129

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

130

126

131

127

bool debug = false;

132

128

static const char mandos_protocol_version[] = "1";

134

130

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

135

131

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

136

132

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

133

139

134

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

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135

typedef struct server{

170

165

171

166

/* Function to use when printing errors */

172

167

void perror_plus(const char *print_text){

173

int e = errno;

174

168

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

175

169

program_invocation_short_name);

176

errno = e;

177

170

perror(print_text);

178

171

}

179

172

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

190

173

/*

191

174

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

192

175

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

193

176

* "buffer_length" is how much is already used.

194

177

*/

195

178

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

179

size_t buffer_capacity){

197

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

181

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

199

182

if(buffer == NULL){

205

188

}

206

189

207

190

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

208

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

209

int af){

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

210

194

int ret;

211

195

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

212

196

if(new_server == NULL){

213

197

perror_plus("malloc");

214

return false;

198

return -1;

215

199

}

216

200

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

220

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if(new_server->ip == NULL){

221

205

perror_plus("strdup");

222

return false;

206

return -1;

223

207

}

224

208

/* Special case of first server */

225

209

if (mc.current_server == NULL){

236

220

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

237

221

if(ret == -1){

238

222

perror_plus("clock_gettime");

239

return false;

223

return -1;

240

224

}

241

return true;

225

return 0;

242

226

}

243

227

244

228

/*

245

229

* Initialize GPGME.

246

230

*/

247

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

248

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

249

233

gpgme_error_t rc;

250

234

gpgme_engine_info_t engine_info;

251

235

266

250

267

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

252

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

253

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

254

gpgme_strsource(rc), gpgme_strerror(rc));

271

255

return false;

272

256

}

273

257

274

258

rc = gpgme_op_import(mc.ctx, pgp_data);

275

259

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

278

262

return false;

279

263

}

280

264

287

271

}

288

272

289

273

if(debug){

290

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

274

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

291

275

}

292

276

293

277

/* Init GPGME */

294

278

gpgme_check_version(NULL);

295

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

280

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

299

283

return false;

300

284

}

301

285

302

286

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

303

287

rc = gpgme_get_engine_info(&engine_info);

304

288

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

307

291

return false;

308

292

}

309

293

while(engine_info != NULL){

315

299

engine_info = engine_info->next;

316

300

}

317

301

if(engine_info == NULL){

318

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

319

tempdir);

302

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

320

303

return false;

321

304

}

322

305

323

306

/* Create new GPGME "context" */

324

307

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

325

308

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

329

311

return false;

330

312

}

331

313

350

332

ssize_t plaintext_length = 0;

351

333

352

334

if(debug){

353

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

335

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

354

336

}

355

337

356

338

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

357

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

340

0);

359

341

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

362

344

return -1;

363

345

}

364

346

365

347

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

366

348

rc = gpgme_data_new(&dh_plain);

367

349

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

371

352

gpgme_data_release(dh_crypto);

372

353

return -1;

373

354

}

376

357

data buffer */

377

358

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

378

359

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

381

362

plaintext_length = -1;

382

363

if(debug){

383

364

gpgme_decrypt_result_t result;

384

365

result = gpgme_op_decrypt_result(mc.ctx);

385

366

if(result == NULL){

386

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

367

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

387

368

} else {

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);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

392

373

if(result->file_name != NULL){

393

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

374

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

394

375

}

395

376

gpgme_recipient_t recipient;

396

377

recipient = result->recipients;

397

378

while(recipient != NULL){

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");

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");

405

385

recipient = recipient->next;

406

386

}

407

387

}

410

390

}

411

391

412

392

if(debug){

413

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

393

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

414

394

}

415

395

416

396

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

423

403

*plaintext = NULL;

424

404

while(true){

425

405

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

428

408

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

432

412

}

433

413

434

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

447

427

}

448

428

449

429

if(debug){

450

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

430

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

451

431

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

452

432

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

453

433

}

475

455

/* GnuTLS log function callback */

476

456

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

477

457

const char* string){

478

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

458

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

479

459

}

480

460

481

461

static int init_gnutls_global(const char *pubkeyfilename,

483

463

int ret;

484

464

485

465

if(debug){

486

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

466

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

487

467

}

488

468

489

469

ret = gnutls_global_init();

490

470

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

493

473

return -1;

494

474

}

495

475

504

484

/* OpenPGP credentials */

505

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

486

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

509

489

gnutls_global_deinit();

510

490

return -1;

511

491

}

512

492

513

493

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

494

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

495

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

496

seckeyfilename);

518

497

}

519

498

520

499

ret = gnutls_certificate_set_openpgp_key_file

521

500

(mc.cred, pubkeyfilename, seckeyfilename,

522

501

GNUTLS_OPENPGP_FMT_BASE64);

523

502

if(ret != GNUTLS_E_SUCCESS){

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));

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));

529

508

goto globalfail;

530

509

}

531

510

532

511

/* GnuTLS server initialization */

533

512

ret = gnutls_dh_params_init(&mc.dh_params);

534

513

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

514

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

515

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

538

516

goto globalfail;

539

517

}

540

518

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

541

519

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

544

522

goto globalfail;

545

523

}

546

524

566

544

}

567

545

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

568

546

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

572

549

}

573

550

574

551

{

581

558

}

582

559

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

583

560

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

561

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

562

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

563

safer_gnutls_strerror(ret));

587

564

gnutls_deinit(*session);

588

565

return -1;

589

566

}

598

575

}

599

576

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

600

577

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

603

580

gnutls_deinit(*session);

604

581

return -1;

605

582

}

650

627

pf = PF_INET;

651

628

break;

652

629

default:

653

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

630

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

654

631

errno = EINVAL;

655

632

return -1;

656

633

}

661

638

}

662

639

663

640

if(debug){

664

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

665

PRIu16 "\n", ip, port);

641

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

642

"\n", ip, port);

666

643

}

667

644

668

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

694

671

}

695

672

if(ret == 0){

696

673

int e = errno;

697

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

674

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

698

675

errno = e;

699

676

goto mandos_end;

700

677

}

705

682

706

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

684

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

708

-Wunreachable-code*/

685

-Wunreachable-code*/

709

686

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

712

689

errno = EINVAL;

713

690

goto mandos_end;

714

691

}

732

709

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

733

710

perror_plus("if_indextoname");

734

711

} else {

735

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

736

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

712

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

713

ip, interface, port);

737

714

}

738

715

} else {

739

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

740

ip, port);

716

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

717

port);

741

718

}

742

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

753

730

perror_plus("inet_ntop");

754

731

} else {

755

732

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

756

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

733

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

757

734

}

758

735

}

759

736

}

787

764

while(true){

788

765

size_t out_size = strlen(out);

789

766

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

790

out_size - written));

767

out_size - written));

791

768

if(ret == -1){

792

769

int e = errno;

793

770

perror_plus("write");

813

790

}

814

791

815

792

if(debug){

816

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

793

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

817

794

}

818

795

819

796

if(quit_now){

839

816

840

817

if(ret != GNUTLS_E_SUCCESS){

841

818

if(debug){

842

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

819

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

843

820

gnutls_perror(ret);

844

821

}

845

822

errno = EPROTO;

849

826

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

850

827

851

828

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

829

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

830

ip);

854

831

}

855

832

856

833

while(true){

861

838

}

862

839

863

840

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

841

buffer_capacity);

865

842

if(buffer_capacity == 0){

866

843

int e = errno;

867

844

perror_plus("incbuffer");

894

871

}

895

872

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

896

873

if(ret < 0){

897

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

898

"***\n");

874

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

899

875

gnutls_perror(ret);

900

876

errno = EPROTO;

901

877

goto mandos_end;

902

878

}

903

879

break;

904

880

default:

905

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

906

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

907

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

884

errno = EIO;

909

885

goto mandos_end;

914

890

}

915

891

916

892

if(debug){

917

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

893

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

918

894

}

919

895

920

896

if(quit_now){

932

908

933

909

if(buffer_length > 0){

934

910

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

936

913

&decrypted_buffer);

937

914

if(decrypted_buffer_size >= 0){

938

915

949

926

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

950

927

int e = errno;

951

928

if(debug){

952

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

953

strerror(errno));

929

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

930

strerror(errno));

954

931

}

955

932

errno = e;

956

933

goto mandos_end;

1013

990

switch(event){

1014

991

default:

1015

992

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

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)));

1020

996

break;

1021

997

1022

998

case AVAHI_RESOLVER_FOUND:

1024

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1025

1001

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

1026

1002

if(debug){

1027

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

1028

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

1029

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

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

1006

}

1031

1007

int ret = start_mandos_communication(ip, port, interface,

1032

1008

avahi_proto_to_af(proto));

1033

1009

if(ret == 0){

1034

1010

avahi_simple_poll_quit(mc.simple_poll);

1035

1011

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1041

1014

}

1042

1015

}

1043

1016

}

1067

1040

default:

1068

1041

case AVAHI_BROWSER_FAILURE:

1069

1042

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1072

1045

avahi_simple_poll_quit(mc.simple_poll);

1073

1046

return;

1074

1047

1081

1054

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

1082

1055

name, type, domain, protocol, 0,

1083

1056

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1057

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

1058

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

1087

1059

break;

1088

1060

1089

1061

case AVAHI_BROWSER_REMOVE:

1092

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

1066

if(debug){

1095

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

1096

" searching...\n");

1067

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

1097

1068

}

1098

1069

break;

1099

1070

}

1114

1085

errno = old_errno;

1115

1086

}

1116

1087

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1128

1144

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1145

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

1146

flagstring, if_entry->d_name);

1130

1147

}

1131

return false;

1148

free(flagstring);

1149

return 0;

1132

1150

}

1133

return true;

1134

}

1135

1136

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

1137

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1138

1153

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1140

1155

if(debug){

1141

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

1142

ifname);

1156

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

1157

if_entry->d_name);

1143

1158

}

1144

return false;

1159

return 0;

1145

1160

}

1146

1161

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

1147

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

1162

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

1148

1163

if(debug){

1149

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

1150

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

1164

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

1165

if_entry->d_name);

1151

1166

}

1152

return true;

1167

return 1;

1153

1168

}

1154

1169

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

1155

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

1170

if(not (flags & IFF_BROADCAST)){

1156

1171

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1172

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

1173

if_entry->d_name);

1159

1174

}

1160

return false;

1175

return 0;

1161

1176

}

1162

1177

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

1163

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1164

1179

if(debug){

1165

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

1166

ifname);

1180

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

1181

if_entry->d_name);

1167

1182

}

1168

return false;

1183

return 0;

1169

1184

}

1170

1171

1185

/* Accept this device */

1172

1186

if(debug){

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1187

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

1188

if_entry->d_name);

1242

1189

}

1243

1190

return 1;

1244

1191

}

1254

1201

return 1;

1255

1202

}

1256

1203

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

1205

int ret;

1320

1206

struct timespec now;

1324

1210

while(true){

1325

1211

if(mc.current_server == NULL){

1326

1212

if (debug){

1327

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

1328

" No timeout!\n");

1213

fprintf(stderr,

1214

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

1329

1215

}

1330

1216

ret = avahi_simple_poll_iterate(s, -1);

1331

1217

} else {

1332

1218

if (debug){

1333

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

1334

" it, or wait\n");

1219

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

1220

" or wait\n");

1335

1221

}

1336

1222

/* the current time */

1337

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1353

1239

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

1354

1240

1355

1241

if (debug){

1356

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

1357

block_time);

1242

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

1358

1243

}

1359

1244

1360

1245

if(block_time <= 0){

1380

1265

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

1381

1266

}

1382

1267

if(ret != 0){

1383

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

1268

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

1384

1269

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

1385

1270

}

1386

1271

}

1387

1272

}

1388

1273

}

1389

1274

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1526

1275

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

1527

1276

AvahiSServiceBrowser *sb = NULL;

1528

1277

int error;

1608

1357

.group = 2 },

1609

1358

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

1610

1359

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1360

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

1616

1361

.group = 2 },

1617

1362

/*

1618

1363

* These reproduce what we would get without ARGP_NO_HELP

1672

1417

argp_error(state, "Bad retry interval");

1673

1418

}

1674

1419

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

1420

/*

1679

1421

* These reproduce what we would get without ARGP_NO_HELP

1680

1422

*/

1686

1428

argp_state_help(state, state->out_stream,

1687

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

1430

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

1689

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

1431

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

1690

1432

exit(argp_err_exit_status);

1691

1433

break;

1692

1434

default:

1719

1461

{

1720

1462

/* Work around Debian bug #633582:

1721

1463

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

1464

struct stat st;

1722

1465

1723

1466

/* Re-raise priviliges */

1724

1467

errno = 0;

1725

1468

ret = seteuid(0);

1726

1469

if(ret == -1){

1727

1470

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

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

}

1785

1519

}

1786

1520

1787

1521

if(not debug){

1788

1522

avahi_set_log_function(empty_log);

1789

1523

}

1790

1524

1791

1525

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

1792

1526

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1528

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

1529

if(ret >= 1){

1803

/* Pick the first interface returned */

1530

/* Pick the first good interface */

1804

1531

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

1805

1532

if(debug){

1806

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

1533

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

1807

1534

}

1808

1535

if(interface == NULL){

1809

1536

perror_plus("malloc");

1814

1541

free(direntries);

1815

1542

} else {

1816

1543

free(direntries);

1817

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

1544

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

1818

1545

exitcode = EXIT_FAILURE;

1819

1546

goto end;

1820

1547

}

1826

1553

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

1827

1554

mc.simple_poll = avahi_simple_poll_new();

1828

1555

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1556

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

1831

1557

exitcode = EX_UNAVAILABLE;

1832

1558

goto end;

1833

1559

}

1899

1625

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

1900

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1627

if(if_index == 0){

1902

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

1628

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

1903

1629

exitcode = EX_UNAVAILABLE;

1904

1630

goto end;

1905

1631

}

2025

1751

#endif /* __linux__ */

2026

1752

/* Lower privileges */

2027

1753

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

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

}

2032

1766

}

2033

1767

}

2034

1768

2038

1772

2039

1773

ret = init_gnutls_global(pubkey, seckey);

2040

1774

if(ret == -1){

2041

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

1775

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

2042

1776

exitcode = EX_UNAVAILABLE;

2043

1777

goto end;

2044

1778

} else {

2060

1794

}

2061

1795

2062

1796

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

2063

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

1797

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

2064

1798

exitcode = EX_UNAVAILABLE;

2065

1799

goto end;

2066

1800

} else {

2076

1810

/* (Mainly meant for debugging) */

2077

1811

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

2078

1812

if(address == NULL){

2079

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

1813

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

2080

1814

exitcode = EX_USAGE;

2081

1815

goto end;

2082

1816

}

2090

1824

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

2091

1825

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

2092

1826

or tmpmax != (uint16_t)tmpmax){

2093

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

1827

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

2094

1828

exitcode = EX_USAGE;

2095

1829

goto end;

2096

1830

}

2126

1860

break;

2127

1861

}

2128

1862

if(debug){

2129

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

2130

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2131

1865

}

2132

1866

sleep((int)retry_interval);

2133

1867

}

2135

1869

if (not quit_now){

2136

1870

exitcode = EXIT_SUCCESS;

2137

1871

}

2138

1872

2139

1873

goto end;

2140

1874

}

2141

1875

2163

1897

2164

1898

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

2165

1899

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

1900

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

1901

avahi_strerror(error));

2168

1902

exitcode = EX_UNAVAILABLE;

2169

1903

goto end;

2170

1904

}

2178

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

1913

NULL, 0, browse_callback, NULL);

2180

1914

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2183

1917

exitcode = EX_UNAVAILABLE;

2184

1918

goto end;

2185

1919

}

2191

1925

/* Run the main loop */

2192

1926

2193

1927

if(debug){

2194

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

1928

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

2195

1929

}

2196

1930

2197

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

1932

(int)(retry_interval * 1000));

2199

1933

if(debug){

2200

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

2201

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

1934

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

1935

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

2202

1936

}

2203

1937

2204

1938

end:

2205

1939

2206

1940

if(debug){

2207

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

1941

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

2208

1942

}

2209

1943

2210

1944

/* Cleanup things */

2226

1960

if(gpgme_initialized){

2227

1961

gpgme_release(mc.ctx);

2228

1962

}

2229

1963

2230

1964

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

2231

1965

has seen */

2232

1966

if(mc.current_server != NULL){

2238

1972

}

2239

1973

}

2240

1974

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2245

{

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

2246

1978

errno = 0;

2247

1979

ret = seteuid(0);

2248

1980

if(ret == -1){

2249

1981

perror_plus("seteuid");

2250

1982

}

2251

2252

/* Take down the network interface */

2253

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

1983

if(geteuid() == 0){

2254

1984

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

2255

1985

if(ret == -1){

2256

1986

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

1987

} else if(network.ifr_flags & IFF_UP) {

2258

1988

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

2259

1989

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

2260

1990

if(ret == -1){

2265

1995

if(ret == -1){

2266

1996

perror_plus("close");

2267

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2268

2004

}

2269

2005

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

2006

2277

2007

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

2278

2008

if(tempdir_created){

2292

2022

}

2293

2023

ret = remove(fullname);

2294

2024

if(ret == -1){

2295

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

2296

strerror(errno));

2025

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

2026

strerror(errno));

2297

2027

}

2298

2028

free(fullname);

2299

2029

}