/mandos/trunk : revision 505.3.10

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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42

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

43

stdout, ferror() */

44

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

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stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* strcmp(), strlen(), strerror(),

50

asprintf(), strncpy() */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

51

#include <sys/ioctl.h> /* ioctl */

52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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#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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getnameinfo() */

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

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inet_pton(), connect() */

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

61

60

#include <dirent.h> /* opendir(), struct dirent, readdir()

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61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

78

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

76

setgid(), pause() */

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

88

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

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

92

#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

97

EAI_SYSTEM, gai_strerror() */

98

90

99

91

#ifdef __linux__

100

92

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

142

134

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

143

135

char *connect_to = NULL;

144

136

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

137

149

138

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

150

139

typedef struct server{

151

140

const char *ip;

152

in_port_t port;

141

uint16_t port;

153

142

AvahiIfIndex if_index;

154

143

int af;

155

144

struct timespec last_seen;

159

148

160

149

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

161

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

162

152

AvahiServer *server;

163

153

gnutls_certificate_credentials_t cred;

164

154

unsigned int dh_bits;

166

156

const char *priority;

167

157

gpgme_ctx_t ctx;

168

158

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

159

} mandos_context;

172

160

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

175

166

176

167

sig_atomic_t quit_now = 0;

177

168

int signal_received = 0;

178

169

179

170

/* Function to use when printing errors */

180

171

void perror_plus(const char *print_text){

181

int e = errno;

182

172

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

183

173

program_invocation_short_name);

184

errno = e;

185

174

perror(print_text);

186

175

}

187

176

188

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

189

177

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

190

178

va_list ap;

191

179

va_start (ap, format);

192

180

193

181

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

194

182

program_invocation_short_name));

195

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

183

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

196

184

}

197

185

198

186

/*

200

188

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

201

189

* "buffer_length" is how much is already used.

202

190

*/

203

__attribute__((nonnull, warn_unused_result))

204

191

size_t incbuffer(char **buffer, size_t buffer_length,

205

192

size_t buffer_capacity){

206

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

194

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

195

if(buffer == NULL){

213

196

return 0;

214

197

}

215

*buffer = new_buf;

216

198

buffer_capacity += BUFFER_SIZE;

217

199

}

218

200

return buffer_capacity;

219

201

}

220

202

221

203

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

204

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

205

int af){

225

206

int ret;

226

207

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

227

208

if(new_server == NULL){

228

209

perror_plus("malloc");

229

return false;

210

return -1;

230

211

}

231

212

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

232

213

.port = port,

234

215

.af = af };

235

216

if(new_server->ip == NULL){

236

217

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

218

return -1;

253

219

}

254

220

/* Special case of first server */

255

if(*current_server == NULL){

221

if (mc.current_server == NULL){

256

222

new_server->next = new_server;

257

223

new_server->prev = new_server;

258

*current_server = new_server;

224

mc.current_server = new_server;

225

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

259

226

} else {

260

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

261

new_server->next = *current_server;

262

new_server->prev = (*current_server)->prev;

227

new_server->next = mc.current_server;

228

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

263

229

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

265

}

266

return true;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

267

238

}

268

239

269

240

/*

270

241

* Initialize GPGME.

271

242

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

243

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

244

const char *tempdir){

277

245

gpgme_error_t rc;

278

246

gpgme_engine_info_t engine_info;

279

247

248

280

249

/*

281

250

* Helper function to insert pub and seckey to the engine keyring.

282

251

*/

283

bool import_key(const char * const filename){

252

bool import_key(const char *filename){

284

253

int ret;

285

254

int fd;

286

255

gpgme_data_t pgp_data;

298

267

return false;

299

268

}

300

269

301

rc = gpgme_op_import(mc->ctx, pgp_data);

270

rc = gpgme_op_import(mc.ctx, pgp_data);

302

271

if(rc != GPG_ERR_NO_ERROR){

303

272

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

304

273

gpgme_strsource(rc), gpgme_strerror(rc));

305

274

return false;

306

275

}

307

276

308

ret = close(fd);

277

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

309

278

if(ret == -1){

310

279

perror_plus("close");

311

280

}

348

317

}

349

318

350

319

/* Create new GPGME "context" */

351

rc = gpgme_new(&(mc->ctx));

320

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

352

321

if(rc != GPG_ERR_NO_ERROR){

353

322

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

354

323

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

367

336

* Decrypt OpenPGP data.

368

337

* Returns -1 on error

369

338

*/

370

__attribute__((nonnull, warn_unused_result))

371

339

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

340

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

341

char **plaintext){

375

342

gpgme_data_t dh_crypto, dh_plain;

376

343

gpgme_error_t rc;

377

344

ssize_t ret;

403

370

404

371

/* Decrypt data from the cryptotext data buffer to the plaintext

405

372

data buffer */

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

373

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

407

374

if(rc != GPG_ERR_NO_ERROR){

408

375

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

409

376

gpgme_strsource(rc), gpgme_strerror(rc));

410

377

plaintext_length = -1;

411

378

if(debug){

412

379

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

414

381

if(result == NULL){

415

382

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

416

383

} else {

493

460

return plaintext_length;

494

461

}

495

462

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

463

static const char * safer_gnutls_strerror(int value){

464

const char *ret = gnutls_strerror(value); /* Spurious warning from

465

-Wunreachable-code */

466

if(ret == NULL)

467

ret = "(unknown)";

468

return ret;

507

469

}

508

470

509

471

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

472

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

512

473

const char* string){

513

474

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

514

475

}

515

476

516

__attribute__((nonnull(1, 2, 4), warn_unused_result))

517

477

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

478

const char *seckeyfilename){

521

479

int ret;

522

unsigned int uret;

523

480

524

481

if(debug){

525

482

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

526

483

}

527

484

485

ret = gnutls_global_init();

486

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

489

return -1;

490

}

491

528

492

if(debug){

529

493

/* "Use a log level over 10 to enable all debugging options."

530

494

* - GnuTLS manual

534

498

}

535

499

536

500

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

538

502

if(ret != GNUTLS_E_SUCCESS){

539

503

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

540

504

safer_gnutls_strerror(ret));

505

gnutls_global_deinit();

541

506

return -1;

542

507

}

543

508

549

514

}

550

515

551

516

ret = gnutls_certificate_set_openpgp_key_file

552

(mc->cred, pubkeyfilename, seckeyfilename,

517

(mc.cred, pubkeyfilename, seckeyfilename,

553

518

GNUTLS_OPENPGP_FMT_BASE64);

554

519

if(ret != GNUTLS_E_SUCCESS){

555

520

fprintf_plus(stderr,

561

526

}

562

527

563

528

/* GnuTLS server initialization */

564

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

565

530

if(ret != GNUTLS_E_SUCCESS){

566

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

567

532

" initialization: %s\n",

568

533

safer_gnutls_strerror(ret));

569

534

goto globalfail;

570

535

}

571

/* If a Diffie-Hellman parameters file was given, try to use it */

572

if(dhparamsfilename != NULL){

573

gnutls_datum_t params = { .data = NULL, .size = 0 };

574

do {

575

int dhpfile = open(dhparamsfilename, O_RDONLY);

576

if(dhpfile == -1){

577

perror_plus("open");

578

dhparamsfilename = NULL;

579

break;

580

}

581

size_t params_capacity = 0;

582

while(true){

583

params_capacity = incbuffer((char **)&params.data,

584

(size_t)params.size,

585

(size_t)params_capacity);

586

if(params_capacity == 0){

587

perror_plus("incbuffer");

588

free(params.data);

589

params.data = NULL;

590

dhparamsfilename = NULL;

591

break;

592

}

593

ssize_t bytes_read = read(dhpfile,

594

params.data + params.size,

595

BUFFER_SIZE);

596

/* EOF */

597

if(bytes_read == 0){

598

break;

599

}

600

/* check bytes_read for failure */

601

if(bytes_read < 0){

602

perror_plus("read");

603

free(params.data);

604

params.data = NULL;

605

dhparamsfilename = NULL;

606

break;

607

}

608

params.size += (unsigned int)bytes_read;

609

}

610

if(params.data == NULL){

611

dhparamsfilename = NULL;

612

}

613

if(dhparamsfilename == NULL){

614

break;

615

}

616

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

617

GNUTLS_X509_FMT_PEM);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Failed to parse DH parameters in file"

620

" \"%s\": %s\n", dhparamsfilename,

621

safer_gnutls_strerror(ret));

622

dhparamsfilename = NULL;

623

}

624

} while(false);

625

}

626

if(dhparamsfilename == NULL){

627

if(mc->dh_bits == 0){

628

/* Find out the optimal number of DH bits */

629

/* Try to read the private key file */

630

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

631

do {

632

int secfile = open(seckeyfilename, O_RDONLY);

633

if(secfile == -1){

634

perror_plus("open");

635

break;

636

}

637

size_t buffer_capacity = 0;

638

while(true){

639

buffer_capacity = incbuffer((char **)&buffer.data,

640

(size_t)buffer.size,

641

(size_t)buffer_capacity);

642

if(buffer_capacity == 0){

643

perror_plus("incbuffer");

644

free(buffer.data);

645

buffer.data = NULL;

646

break;

647

}

648

ssize_t bytes_read = read(secfile,

649

buffer.data + buffer.size,

650

BUFFER_SIZE);

651

/* EOF */

652

if(bytes_read == 0){

653

break;

654

}

655

/* check bytes_read for failure */

656

if(bytes_read < 0){

657

perror_plus("read");

658

free(buffer.data);

659

buffer.data = NULL;

660

break;

661

}

662

buffer.size += (unsigned int)bytes_read;

663

}

664

close(secfile);

665

} while(false);

666

/* If successful, use buffer to parse private key */

667

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

668

if(buffer.data != NULL){

669

{

670

gnutls_openpgp_privkey_t privkey = NULL;

671

ret = gnutls_openpgp_privkey_init(&privkey);

672

if(ret != GNUTLS_E_SUCCESS){

673

fprintf_plus(stderr, "Error initializing OpenPGP key"

674

" structure: %s",

675

safer_gnutls_strerror(ret));

676

free(buffer.data);

677

buffer.data = NULL;

678

} else {

679

ret = gnutls_openpgp_privkey_import

680

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

681

if(ret != GNUTLS_E_SUCCESS){

682

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

683

safer_gnutls_strerror(ret));

684

privkey = NULL;

685

}

686

free(buffer.data);

687

buffer.data = NULL;

688

if(privkey != NULL){

689

/* Use private key to suggest an appropriate

690

sec_param */

691

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

692

gnutls_openpgp_privkey_deinit(privkey);

693

if(debug){

694

fprintf_plus(stderr, "This OpenPGP key implies using"

695

" a GnuTLS security parameter \"%s\".\n",

696

safe_string(gnutls_sec_param_get_name

697

(sec_param)));

698

}

699

}

700

}

701

}

702

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

703

/* Err on the side of caution */

704

sec_param = GNUTLS_SEC_PARAM_ULTRA;

705

if(debug){

706

fprintf_plus(stderr, "Falling back to security parameter"

707

" \"%s\"\n",

708

safe_string(gnutls_sec_param_get_name

709

(sec_param)));

710

}

711

}

712

}

713

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

714

if(uret != 0){

715

mc->dh_bits = uret;

716

if(debug){

717

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

718

" implies %u DH bits; using that.\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)),

721

mc->dh_bits);

722

}

723

} else {

724

fprintf_plus(stderr, "Failed to get implied number of DH"

725

" bits for security parameter \"%s\"): %s\n",

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

safer_gnutls_strerror(ret));

729

goto globalfail;

730

}

731

} else if(debug){

732

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

733

mc->dh_bits);

734

}

735

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

736

if(ret != GNUTLS_E_SUCCESS){

737

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

738

" bits): %s\n", mc->dh_bits,

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

}

743

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

536

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

537

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

540

goto globalfail;

541

}

542

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

744

544

745

545

return 0;

746

546

747

547

globalfail:

748

548

749

gnutls_certificate_free_credentials(mc->cred);

750

gnutls_dh_params_deinit(mc->dh_params);

549

gnutls_certificate_free_credentials(mc.cred);

550

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

751

552

return -1;

752

553

}

753

554

754

__attribute__((nonnull, warn_unused_result))

755

static int init_gnutls_session(gnutls_session_t *session,

756

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

757

556

int ret;

758

557

/* GnuTLS session creation */

759

558

do {

771

570

{

772

571

const char *err;

773

572

do {

774

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

573

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

775

574

if(quit_now){

776

575

gnutls_deinit(*session);

777

576

return -1;

788

587

789

588

do {

790

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

791

mc->cred);

590

mc.cred);

792

591

if(quit_now){

793

592

gnutls_deinit(*session);

794

593

return -1;

804

603

/* ignore client certificate if any. */

805

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

806

605

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

607

807

608

return 0;

808

609

}

809

610

811

612

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

812

613

__attribute__((unused)) const char *txt){}

813

614

814

/* Set effective uid to 0, return errno */

815

__attribute__((warn_unused_result))

816

error_t raise_privileges(void){

817

error_t old_errno = errno;

818

error_t ret_errno = 0;

819

if(seteuid(0) == -1){

820

ret_errno = errno;

821

}

822

errno = old_errno;

823

return ret_errno;

824

}

825

826

/* Set effective and real user ID to 0. Return errno. */

827

__attribute__((warn_unused_result))

828

error_t raise_privileges_permanently(void){

829

error_t old_errno = errno;

830

error_t ret_errno = raise_privileges();

831

if(ret_errno != 0){

832

errno = old_errno;

833

return ret_errno;

834

}

835

if(setuid(0) == -1){

836

ret_errno = errno;

837

}

838

errno = old_errno;

839

return ret_errno;

840

}

841

842

/* Set effective user ID to unprivileged saved user ID */

843

__attribute__((warn_unused_result))

844

error_t lower_privileges(void){

845

error_t old_errno = errno;

846

error_t ret_errno = 0;

847

if(seteuid(uid) == -1){

848

ret_errno = errno;

849

}

850

errno = old_errno;

851

return ret_errno;

852

}

853

854

/* Lower privileges permanently */

855

__attribute__((warn_unused_result))

856

error_t lower_privileges_permanently(void){

857

error_t old_errno = errno;

858

error_t ret_errno = 0;

859

if(setuid(uid) == -1){

860

ret_errno = errno;

861

}

862

errno = old_errno;

863

return ret_errno;

864

}

865

866

/* Helper function to add_local_route() and delete_local_route() */

867

__attribute__((nonnull, warn_unused_result))

868

static bool add_delete_local_route(const bool add,

869

const char *address,

870

AvahiIfIndex if_index){

871

int ret;

872

char helper[] = "mandos-client-iprouteadddel";

873

char add_arg[] = "add";

874

char delete_arg[] = "delete";

875

char debug_flag[] = "--debug";

876

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

877

if(pluginhelperdir == NULL){

878

if(debug){

879

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

880

" variable not set; cannot run helper\n");

881

}

882

return false;

883

}

884

885

char interface[IF_NAMESIZE];

886

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

887

perror_plus("if_indextoname");

888

return false;

889

}

890

891

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

892

if(devnull == -1){

893

perror_plus("open(\"/dev/null\", O_RDONLY)");

894

return false;

895

}

896

pid_t pid = fork();

897

if(pid == 0){

898

/* Child */

899

/* Raise privileges */

900

errno = raise_privileges_permanently();

901

if(errno != 0){

902

perror_plus("Failed to raise privileges");

903

/* _exit(EX_NOPERM); */

904

} else {

905

/* Set group */

906

errno = 0;

907

ret = setgid(0);

908

if(ret == -1){

909

perror_plus("setgid");

910

_exit(EX_NOPERM);

911

}

912

/* Reset supplementary groups */

913

errno = 0;

914

ret = setgroups(0, NULL);

915

if(ret == -1){

916

perror_plus("setgroups");

917

_exit(EX_NOPERM);

918

}

919

}

920

ret = dup2(devnull, STDIN_FILENO);

921

if(ret == -1){

922

perror_plus("dup2(devnull, STDIN_FILENO)");

923

_exit(EX_OSERR);

924

}

925

ret = close(devnull);

926

if(ret == -1){

927

perror_plus("close");

928

_exit(EX_OSERR);

929

}

930

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

931

if(ret == -1){

932

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

933

_exit(EX_OSERR);

934

}

935

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

936

O_RDONLY

937

| O_DIRECTORY

938

| O_PATH

939

| O_CLOEXEC));

940

if(helperdir_fd == -1){

941

perror_plus("open");

942

_exit(EX_UNAVAILABLE);

943

}

944

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

945

helper, O_RDONLY));

946

if(helper_fd == -1){

947

perror_plus("openat");

948

close(helperdir_fd);

949

_exit(EX_UNAVAILABLE);

950

}

951

close(helperdir_fd);

952

#ifdef __GNUC__

953

#pragma GCC diagnostic push

954

#pragma GCC diagnostic ignored "-Wcast-qual"

955

#endif

956

if(fexecve(helper_fd, (char *const [])

957

{ helper, add ? add_arg : delete_arg, (char *)address,

958

interface, debug ? debug_flag : NULL, NULL },

959

environ) == -1){

960

#ifdef __GNUC__

961

#pragma GCC diagnostic pop

962

#endif

963

perror_plus("fexecve");

964

_exit(EXIT_FAILURE);

965

}

966

}

967

if(pid == -1){

968

perror_plus("fork");

969

return false;

970

}

971

int status;

972

pid_t pret = -1;

973

errno = 0;

974

do {

975

pret = waitpid(pid, &status, 0);

976

if(pret == -1 and errno == EINTR and quit_now){

977

int errno_raising = 0;

978

if((errno = raise_privileges()) != 0){

979

errno_raising = errno;

980

perror_plus("Failed to raise privileges in order to"

981

" kill helper program");

982

}

983

if(kill(pid, SIGTERM) == -1){

984

perror_plus("kill");

985

}

986

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

987

perror_plus("Failed to lower privileges after killing"

988

" helper program");

989

}

990

return false;

991

}

992

} while(pret == -1 and errno == EINTR);

993

if(pret == -1){

994

perror_plus("waitpid");

995

return false;

996

}

997

if(WIFEXITED(status)){

998

if(WEXITSTATUS(status) != 0){

999

fprintf_plus(stderr, "Error: iprouteadddel exited"

1000

" with status %d\n", WEXITSTATUS(status));

1001

return false;

1002

}

1003

return true;

1004

}

1005

if(WIFSIGNALED(status)){

1006

fprintf_plus(stderr, "Error: iprouteadddel died by"

1007

" signal %d\n", WTERMSIG(status));

1008

return false;

1009

}

1010

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1011

return false;

1012

}

1013

1014

__attribute__((nonnull, warn_unused_result))

1015

static bool add_local_route(const char *address,

1016

AvahiIfIndex if_index){

1017

if(debug){

1018

fprintf_plus(stderr, "Adding route to %s\n", address);

1019

}

1020

return add_delete_local_route(true, address, if_index);

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool delete_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

fprintf_plus(stderr, "Removing route to %s\n", address);

1028

}

1029

return add_delete_local_route(false, address, if_index);

1030

}

1031

1032

615

/* Called when a Mandos server is found */

1033

__attribute__((nonnull, warn_unused_result))

1034

static int start_mandos_communication(const char *ip, in_port_t port,

616

static int start_mandos_communication(const char *ip, uint16_t port,

1035

617

AvahiIfIndex if_index,

1036

int af, mandos_context *mc){

618

int af){

1037

619

int ret, tcp_sd = -1;

1038

620

ssize_t sret;

1039

struct sockaddr_storage to;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

1040

625

char *buffer = NULL;

1041

626

char *decrypted_buffer = NULL;

1042

627

size_t buffer_length = 0;

1045

630

int retval = -1;

1046

631

gnutls_session_t session;

1047

632

int pf; /* Protocol family */

1048

bool route_added = false;

1049

633

1050

634

errno = 0;

1051

635

1067

651

return -1;

1068

652

}

1069

653

1070

/* If the interface is specified and we have a list of interfaces */

1071

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1072

/* Check if the interface is one of the interfaces we are using */

1073

bool match = false;

1074

{

1075

char *interface = NULL;

1076

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

1077

interface))){

1078

if(if_nametoindex(interface) == (unsigned int)if_index){

1079

match = true;

1080

break;

1081

}

1082

}

1083

}

1084

if(not match){

1085

/* This interface does not match any in the list, so we don't

1086

connect to the server */

1087

if(debug){

1088

char interface[IF_NAMESIZE];

1089

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

1090

perror_plus("if_indextoname");

1091

} else {

1092

fprintf_plus(stderr, "Skipping server on non-used interface"

1093

" \"%s\"\n",

1094

if_indextoname((unsigned int)if_index,

1095

interface));

1096

}

1097

}

1098

return -1;

1099

}

1100

}

1101

1102

ret = init_gnutls_session(&session, mc);

654

ret = init_gnutls_session(&session);

1103

655

if(ret != 0){

1104

656

return -1;

1105

657

}

1106

658

1107

659

if(debug){

1108

660

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

1109

PRIuMAX "\n", ip, (uintmax_t)port);

661

PRIu16 "\n", ip, port);

1110

662

}

1111

663

1112

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

1113

665

if(tcp_sd < 0){

1114

666

int e = errno;

1115

667

perror_plus("socket");

1122

674

goto mandos_end;

1123

675

}

1124

676

677

memset(&to, 0, sizeof(to));

1125

678

if(af == AF_INET6){

1126

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1127

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1128

ret = inet_pton(af, ip, &to6->sin6_addr);

679

to.in6.sin6_family = (sa_family_t)af;

680

ret = inet_pton(af, ip, &to.in6.sin6_addr);

1129

681

} else { /* IPv4 */

1130

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1131

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1132

ret = inet_pton(af, ip, &to4->sin_addr);

682

to.in.sin_family = (sa_family_t)af;

683

ret = inet_pton(af, ip, &to.in.sin_addr);

1133

684

}

1134

685

if(ret < 0 ){

1135

686

int e = errno;

1144

695

goto mandos_end;

1145

696

}

1146

697

if(af == AF_INET6){

1147

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1148

if(IN6_IS_ADDR_LINKLOCAL

1149

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

698

to.in6.sin6_port = htons(port); /* Spurious warnings from

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

1150

705

if(if_index == AVAHI_IF_UNSPEC){

1151

706

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

1152

707

" incomplete without a network interface\n");

1154

709

goto mandos_end;

1155

710

}

1156

711

/* Set the network interface number as scope */

1157

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

712

to.in6.sin6_scope_id = (uint32_t)if_index;

1158

713

}

1159

714

} else {

1160

((struct sockaddr_in *)&to)->sin_port = htons(port);

715

to.in.sin_port = htons(port); /* Spurious warnings from

716

-Wconversion and

717

-Wunreachable-code */

1161

718

}

1162

719

1163

720

if(quit_now){

1171

728

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

1172

729

perror_plus("if_indextoname");

1173

730

} else {

1174

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

1175

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

731

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

732

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

1176

733

}

1177

734

} else {

1178

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

1179

ip, (uintmax_t)port);

735

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

736

ip, port);

1180

737

}

1181

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1182

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1183

if(af == AF_INET6){

1184

ret = getnameinfo((struct sockaddr *)&to,

1185

sizeof(struct sockaddr_in6),

1186

addrstr, sizeof(addrstr), NULL, 0,

1187

NI_NUMERICHOST);

1188

} else {

1189

ret = getnameinfo((struct sockaddr *)&to,

1190

sizeof(struct sockaddr_in),

1191

addrstr, sizeof(addrstr), NULL, 0,

1192

NI_NUMERICHOST);

1193

}

1194

if(ret == EAI_SYSTEM){

1195

perror_plus("getnameinfo");

1196

} else if(ret != 0) {

1197

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1198

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

1199

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

1200

}

1201

}

1202

1203

if(quit_now){

1204

errno = EINTR;

1205

goto mandos_end;

1206

}

1207

1208

while(true){

1209

if(af == AF_INET6){

1210

ret = connect(tcp_sd, (struct sockaddr *)&to,

1211

sizeof(struct sockaddr_in6));

1212

} else {

1213

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1214

sizeof(struct sockaddr_in));

1215

}

1216

if(ret < 0){

1217

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1218

and if_index != AVAHI_IF_UNSPEC

1219

and connect_to == NULL

1220

and not route_added and

1221

((af == AF_INET6 and not

1222

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1223

&to)->sin6_addr)))

1224

or (af == AF_INET and

1225

/* Not a a IPv4LL address */

1226

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1227

& 0xFFFF0000L) != 0xA9FE0000L))){

1228

/* Work around Avahi bug - Avahi does not announce link-local

1229

addresses if it has a global address, so local hosts with

1230

*only* a link-local address (e.g. Mandos clients) cannot

1231

connect to a Mandos server announced by Avahi on a server

1232

host with a global address. Work around this by retrying

1233

with an explicit route added with the server's address.

1234

1235

Avahi bug reference:

1236

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1237

https://bugs.debian.org/587961

1238

*/

1239

if(debug){

1240

fprintf_plus(stderr, "Mandos server unreachable, trying"

1241

" direct route\n");

1242

}

1243

int e = errno;

1244

route_added = add_local_route(ip, if_index);

1245

if(route_added){

1246

continue;

1247

}

1248

errno = e;

1249

}

1250

if(errno != ECONNREFUSED or debug){

1251

int e = errno;

1252

perror_plus("connect");

1253

errno = e;

1254

}

1255

goto mandos_end;

1256

}

1257

1258

if(quit_now){

1259

errno = EINTR;

1260

goto mandos_end;

1261

}

1262

break;

740

const char *pcret;

741

if(af == AF_INET6){

742

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

743

sizeof(addrstr));

744

} else {

745

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

746

sizeof(addrstr));

747

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

754

}

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

762

if(af == AF_INET6){

763

ret = connect(tcp_sd, &to.in6, sizeof(to));

764

} else {

765

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

766

}

767

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

773

goto mandos_end;

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

1263

779

}

1264

780

1265

781

const char *out = mandos_protocol_version;

1301

817

goto mandos_end;

1302

818

}

1303

819

1304

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

1305

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

1306

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

1307

gnutls_transport_set_ptr(session,

1308

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1309

822

1310

823

if(quit_now){

1311

824

errno = EINTR;

1416

929

if(buffer_length > 0){

1417

930

ssize_t decrypted_buffer_size;

1418

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1419

&decrypted_buffer, mc);

932

&decrypted_buffer);

1420

933

if(decrypted_buffer_size >= 0){

1421

934

1422

935

written = 0;

1448

961

1449

962

mandos_end:

1450

963

{

1451

if(route_added){

1452

if(not delete_local_route(ip, if_index)){

1453

fprintf_plus(stderr, "Failed to delete local route to %s on"

1454

" interface %d", ip, if_index);

1455

}

1456

}

1457

964

int e = errno;

1458

965

free(decrypted_buffer);

1459

966

free(buffer);

1460

967

if(tcp_sd >= 0){

1461

ret = close(tcp_sd);

968

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

1462

969

}

1463

970

if(ret == -1){

1464

971

if(e == 0){

1476

983

return retval;

1477

984

}

1478

985

1479

__attribute__((nonnull))

1480

986

static void resolve_callback(AvahiSServiceResolver *r,

1481

987

AvahiIfIndex interface,

1482

988

AvahiProtocol proto,

1490

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1491

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1492

998

flags,

1493

void *mc){

1494

if(r == NULL){

1495

return;

1496

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1497

1001

1498

1002

/* Called whenever a service has been resolved successfully or

1499

1003

timed out */

1500

1004

1501

1005

if(quit_now){

1502

avahi_s_service_resolver_free(r);

1503

1006

return;

1504

1007

}

1505

1008

1509

1012

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

1510

1013

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

1511

1014

domain,

1512

avahi_strerror(avahi_server_errno

1513

(((mandos_context*)mc)->server)));

1015

avahi_strerror(avahi_server_errno(mc.server)));

1514

1016

break;

1515

1017

1516

1018

case AVAHI_RESOLVER_FOUND:

1522

1024

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

1523

1025

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

1524

1026

}

1525

int ret = start_mandos_communication(ip, (in_port_t)port,

1526

interface,

1527

avahi_proto_to_af(proto),

1528

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1529

1029

if(ret == 0){

1530

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1531

1031

} else {

1532

if(not add_server(ip, (in_port_t)port, interface,

1533

avahi_proto_to_af(proto),

1534

&((mandos_context*)mc)->current_server)){

1535

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

1536

" list\n", name);

1537

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1538

1034

}

1539

1035

}

1540

1036

}

1550

1046

const char *domain,

1551

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1552

1048

flags,

1553

void *mc){

1554

if(b == NULL){

1555

return;

1556

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1557

1051

1558

1052

/* Called whenever a new services becomes available on the LAN or

1559

1053

is removed from the LAN */

1567

1061

case AVAHI_BROWSER_FAILURE:

1568

1062

1569

1063

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

1570

avahi_strerror(avahi_server_errno

1571

(((mandos_context*)mc)->server)));

1572

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1573

1066

return;

1574

1067

1575

1068

case AVAHI_BROWSER_NEW:

1578

1071

the callback function is called the Avahi server will free the

1579

1072

resolver for us. */

1580

1073

1581

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1582

interface, protocol, name, type,

1583

domain, protocol, 0,

1584

resolve_callback, mc) == NULL)

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1585

1077

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

1586

1078

" %s\n", name,

1587

avahi_strerror(avahi_server_errno

1588

(((mandos_context*)mc)->server)));

1079

avahi_strerror(avahi_server_errno(mc.server)));

1589

1080

break;

1590

1081

1591

1082

case AVAHI_BROWSER_REMOVE:

1610

1101

signal_received = sig;

1611

1102

int old_errno = errno;

1612

1103

/* set main loop to exit */

1613

if(simple_poll != NULL){

1614

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1615

1106

}

1616

1107

errno = old_errno;

1617

1108

}

1618

1109

1619

__attribute__((nonnull, warn_unused_result))

1620

1110

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

1621

1111

int ret;

1622

error_t ret_errno;

1623

1112

1624

1113

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

1625

1114

if(s < 0){

1626

ret_errno = errno;

1627

1115

perror_plus("socket");

1628

errno = ret_errno;

1629

1116

return false;

1630

1117

}

1631

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1632

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1118

strcpy(ifr->ifr_name, ifname);

1633

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1634

1120

if(ret == -1){

1635

1121

if(debug){

1636

ret_errno = errno;

1637

1122

perror_plus("ioctl SIOCGIFFLAGS");

1638

errno = ret_errno;

1639

1123

}

1640

1124

return false;

1641

1125

}

1642

1126

return true;

1643

1127

}

1644

1128

1645

__attribute__((nonnull, warn_unused_result))

1646

1129

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

1647

1130

1648

1131

/* Reject the loopback device */

1690

1173

* corresponds to an acceptable network device.

1691

1174

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

1692

1175

*/

1693

__attribute__((nonnull, warn_unused_result))

1694

1176

int good_interface(const struct dirent *if_entry){

1695

1177

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

1696

1178

return 0;

1712

1194

}

1713

1195

1714

1196

/*

1715

* This function determines if a network interface is up.

1716

*/

1717

__attribute__((nonnull, warn_unused_result))

1718

bool interface_is_up(const char *interface){

1719

struct ifreq ifr;

1720

if(not get_flags(interface, &ifr)){

1721

if(debug){

1722

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

1723

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

1724

}

1725

return false;

1726

}

1727

1728

return (bool)(ifr.ifr_flags & IFF_UP);

1729

}

1730

1731

/*

1732

* This function determines if a network interface is running

1733

*/

1734

__attribute__((nonnull, warn_unused_result))

1735

bool interface_is_running(const char *interface){

1736

struct ifreq ifr;

1737

if(not get_flags(interface, &ifr)){

1738

if(debug){

1739

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

1740

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

1741

}

1742

return false;

1743

}

1744

1745

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1746

}

1747

1748

__attribute__((nonnull, pure, warn_unused_result))

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1749

1239

int notdotentries(const struct dirent *direntry){

1750

1240

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

1751

1241

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

1758

1248

}

1759

1249

1760

1250

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

1761

__attribute__((nonnull, warn_unused_result))

1762

1251

int runnable_hook(const struct dirent *direntry){

1763

1252

int ret;

1764

1253

size_t sret;

1772

1261

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

1773

1262

"abcdefghijklmnopqrstuvwxyz"

1774

1263

"0123456789"

1775

"_.-");

1264

"_-");

1776

1265

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

1777

1266

/* Contains non-allowed characters */

1778

1267

if(debug){

1782

1271

return 0;

1783

1272

}

1784

1273

1785

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1786

1282

if(ret == -1){

1787

1283

if(debug){

1788

1284

perror_plus("Could not stat hook");

1805

1301

}

1806

1302

return 0;

1807

1303

}

1808

if(debug){

1809

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

1810

direntry->d_name);

1811

}

1812

1304

return 1;

1813

1305

}

1814

1306

1815

__attribute__((nonnull, warn_unused_result))

1816

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1817

mandos_context *mc){

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1818

1308

int ret;

1819

1309

struct timespec now;

1820

1310

struct timespec waited_time;

1821

1311

intmax_t block_time;

1822

1312

1823

1313

while(true){

1824

if(mc->current_server == NULL){

1825

if(debug){

1314

if(mc.current_server == NULL){

1315

if (debug){

1826

1316

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

1827

1317

" No timeout!\n");

1828

1318

}

1829

1319

ret = avahi_simple_poll_iterate(s, -1);

1830

1320

} else {

1831

if(debug){

1321

if (debug){

1832

1322

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

1833

1323

" it, or wait\n");

1834

1324

}

1841

1331

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

1842

1332

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

1843

1333

waited_time.tv_sec = (now.tv_sec

1844

- mc->current_server->last_seen.tv_sec);

1334

- mc.current_server->last_seen.tv_sec);

1845

1335

waited_time.tv_nsec = (now.tv_nsec

1846

- mc->current_server->last_seen.tv_nsec);

1336

- mc.current_server->last_seen.tv_nsec);

1847

1337

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

1848

1338

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

1849

1339

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

1851

1341

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

1852

1342

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

1853

1343

1854

if(debug){

1344

if (debug){

1855

1345

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

1856

1346

block_time);

1857

1347

}

1858

1348

1859

1349

if(block_time <= 0){

1860

ret = start_mandos_communication(mc->current_server->ip,

1861

mc->current_server->port,

1862

mc->current_server->if_index,

1863

mc->current_server->af, mc);

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1864

1354

if(ret == 0){

1865

avahi_simple_poll_quit(s);

1355

avahi_simple_poll_quit(mc.simple_poll);

1866

1356

return 0;

1867

1357

}

1868

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1869

&mc->current_server->last_seen);

1359

&mc.current_server->last_seen);

1870

1360

if(ret == -1){

1871

1361

perror_plus("clock_gettime");

1872

1362

return -1;

1873

1363

}

1874

mc->current_server = mc->current_server->next;

1364

mc.current_server = mc.current_server->next;

1875

1365

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

1876

1366

servers, but don't block */

1877

1367

}

1879

1369

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

1880

1370

}

1881

1371

if(ret != 0){

1882

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

1372

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

1883

1373

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

1884

1374

}

1885

1375

}

1886

1376

}

1887

1377

}

1888

1378

1889

__attribute__((nonnull))

1890

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

1379

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

1891

1380

const float delay){

1892

struct dirent **direntries = NULL;

1893

if(hookdir_fd == -1){

1894

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1895

| O_CLOEXEC);

1896

if(hookdir_fd == -1){

1897

if(errno == ENOENT){

1898

if(debug){

1899

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1900

" found\n", hookdir);

1901

}

1902

} else {

1903

perror_plus("open");

1904

}

1905

return;

1906

}

1907

}

1908

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1909

runnable_hook, alphasort);

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1910

1386

if(numhooks == -1){

1911

1387

perror_plus("scandir");

1912

return;

1913

}

1914

struct dirent *direntry;

1915

int ret;

1916

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

1917

if(devnull == -1){

1918

perror_plus("open(\"/dev/null\", O_RDONLY)");

1919

return;

1920

}

1921

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

1922

direntry = direntries[i];

1923

if(debug){

1924

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

1925

direntry->d_name);

1926

}

1927

pid_t hook_pid = fork();

1928

if(hook_pid == 0){

1929

/* Child */

1930

/* Raise privileges */

1931

errno = raise_privileges_permanently();

1932

if(errno != 0){

1933

perror_plus("Failed to raise privileges");

1934

_exit(EX_NOPERM);

1935

}

1936

/* Set group */

1937

errno = 0;

1938

ret = setgid(0);

1939

if(ret == -1){

1940

perror_plus("setgid");

1941

_exit(EX_NOPERM);

1942

}

1943

/* Reset supplementary groups */

1944

errno = 0;

1945

ret = setgroups(0, NULL);

1946

if(ret == -1){

1947

perror_plus("setgroups");

1948

_exit(EX_NOPERM);

1949

}

1950

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

1951

if(ret == -1){

1952

perror_plus("setenv");

1953

_exit(EX_OSERR);

1954

}

1955

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

1956

if(ret == -1){

1957

perror_plus("setenv");

1958

_exit(EX_OSERR);

1959

}

1960

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

1961

if(ret == -1){

1962

perror_plus("setenv");

1963

_exit(EX_OSERR);

1964

}

1965

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

1966

if(ret == -1){

1967

perror_plus("setenv");

1968

_exit(EX_OSERR);

1969

}

1970

char *delaystring;

1971

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

1972

if(ret == -1){

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1973

1395

perror_plus("asprintf");

1974

_exit(EX_OSERR);

1396

continue;

1975

1397

}

1976

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

1977

if(ret == -1){

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1978

1436

free(delaystring);

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

free(delaystring);

1983

if(connect_to != NULL){

1984

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

1985

if(ret == -1){

1986

perror_plus("setenv");

1987

_exit(EX_OSERR);

1988

}

1989

}

1990

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

1991

direntry->d_name,

1992

O_RDONLY));

1993

if(hook_fd == -1){

1994

perror_plus("openat");

1995

_exit(EXIT_FAILURE);

1996

}

1997

if(close(hookdir_fd) == -1){

1998

perror_plus("close");

1999

_exit(EXIT_FAILURE);

2000

}

2001

ret = dup2(devnull, STDIN_FILENO);

2002

if(ret == -1){

2003

perror_plus("dup2(devnull, STDIN_FILENO)");

2004

_exit(EX_OSERR);

2005

}

2006

ret = close(devnull);

2007

if(ret == -1){

2008

perror_plus("close");

2009

_exit(EX_OSERR);

2010

}

2011

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2012

if(ret == -1){

2013

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2014

_exit(EX_OSERR);

2015

}

2016

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2017

environ) == -1){

2018

perror_plus("fexecve");

2019

_exit(EXIT_FAILURE);

2020

}

2021

} else {

2022

if(hook_pid == -1){

2023

perror_plus("fork");

2024

free(direntry);

2025

continue;

2026

}

2027

int status;

2028

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

2029

perror_plus("waitpid");

2030

free(direntry);

2031

continue;

2032

}

2033

if(WIFEXITED(status)){

2034

if(WEXITSTATUS(status) != 0){

2035

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

2036

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

2037

WEXITSTATUS(status));

2038

free(direntry);

2039

continue;

2040

}

2041

} else if(WIFSIGNALED(status)){

2042

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

2043

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

2044

WTERMSIG(status));

2045

free(direntry);

2046

continue;

2047

} else {

2048

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

2049

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

2050

free(direntry);

2051

continue;

2052

}

2053

}

2054

if(debug){

2055

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

2056

direntry->d_name);

2057

}

2058

free(direntry);

2059

}

2060

free(direntries);

2061

if(close(hookdir_fd) == -1){

2062

perror_plus("close");

2063

} else {

2064

hookdir_fd = -1;

2065

}

2066

close(devnull);

2067

}

2068

2069

__attribute__((nonnull, warn_unused_result))

2070

error_t bring_up_interface(const char *const interface,

2071

const float delay){

2072

error_t old_errno = errno;

2073

int ret;

2074

struct ifreq network;

2075

unsigned int if_index = if_nametoindex(interface);

2076

if(if_index == 0){

2077

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

2078

errno = old_errno;

2079

return ENXIO;

2080

}

2081

2082

if(quit_now){

2083

errno = old_errno;

2084

return EINTR;

2085

}

2086

2087

if(not interface_is_up(interface)){

2088

error_t ret_errno = 0, ioctl_errno = 0;

2089

if(not get_flags(interface, &network)){

2090

ret_errno = errno;

2091

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

2092

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

2093

errno = old_errno;

2094

return ret_errno;

2095

}

2096

network.ifr_flags |= IFF_UP; /* set flag */

2097

2098

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

2099

if(sd == -1){

2100

ret_errno = errno;

2101

perror_plus("socket");

2102

errno = old_errno;

2103

return ret_errno;

2104

}

2105

2106

if(quit_now){

2107

ret = close(sd);

2108

if(ret == -1){

2109

perror_plus("close");

2110

}

2111

errno = old_errno;

2112

return EINTR;

2113

}

2114

2115

if(debug){

2116

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2117

interface);

2118

}

2119

2120

/* Raise privileges */

2121

ret_errno = raise_privileges();

2122

if(ret_errno != 0){

2123

errno = ret_errno;

2124

perror_plus("Failed to raise privileges");

2125

}

2126

2127

#ifdef __linux__

2128

int ret_linux;

2129

bool restore_loglevel = false;

2130

if(ret_errno == 0){

2131

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2132

messages about the network interface to mess up the prompt */

2133

ret_linux = klogctl(8, NULL, 5);

2134

if(ret_linux == -1){

2135

perror_plus("klogctl");

2136

} else {

2137

restore_loglevel = true;

2138

}

2139

}

2140

#endif /* __linux__ */

2141

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2142

ioctl_errno = errno;

2143

#ifdef __linux__

2144

if(restore_loglevel){

2145

ret_linux = klogctl(7, NULL, 0);

2146

if(ret_linux == -1){

2147

perror_plus("klogctl");

2148

}

2149

}

2150

#endif /* __linux__ */

2151

2152

/* If raise_privileges() succeeded above */

2153

if(ret_errno == 0){

2154

/* Lower privileges */

2155

ret_errno = lower_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to lower privileges");

2159

}

2160

}

2161

2162

/* Close the socket */

2163

ret = close(sd);

2164

if(ret == -1){

2165

perror_plus("close");

2166

}

2167

2168

if(ret_setflags == -1){

2169

errno = ioctl_errno;

2170

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2171

errno = old_errno;

2172

return ioctl_errno;

2173

}

2174

} else if(debug){

2175

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

2176

interface);

2177

}

2178

2179

/* Sleep checking until interface is running.

2180

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

2181

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

2182

if(interface_is_running(interface)){

2183

break;

2184

}

2185

struct timespec sleeptime = { .tv_nsec = 250000000 };

2186

ret = nanosleep(&sleeptime, NULL);

2187

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

2188

perror_plus("nanosleep");

2189

}

2190

}

2191

2192

errno = old_errno;

2193

return 0;

2194

}

2195

2196

__attribute__((nonnull, warn_unused_result))

2197

error_t take_down_interface(const char *const interface){

2198

error_t old_errno = errno;

2199

struct ifreq network;

2200

unsigned int if_index = if_nametoindex(interface);

2201

if(if_index == 0){

2202

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

2203

errno = old_errno;

2204

return ENXIO;

2205

}

2206

if(interface_is_up(interface)){

2207

error_t ret_errno = 0, ioctl_errno = 0;

2208

if(not get_flags(interface, &network) and debug){

2209

ret_errno = errno;

2210

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

2211

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

2212

errno = old_errno;

2213

return ret_errno;

2214

}

2215

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

2216

2217

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

2218

if(sd == -1){

2219

ret_errno = errno;

2220

perror_plus("socket");

2221

errno = old_errno;

2222

return ret_errno;

2223

}

2224

2225

if(debug){

2226

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

2227

interface);

2228

}

2229

2230

/* Raise privileges */

2231

ret_errno = raise_privileges();

2232

if(ret_errno != 0){

2233

errno = ret_errno;

2234

perror_plus("Failed to raise privileges");

2235

}

2236

2237

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2238

ioctl_errno = errno;

2239

2240

/* If raise_privileges() succeeded above */

2241

if(ret_errno == 0){

2242

/* Lower privileges */

2243

ret_errno = lower_privileges();

2244

if(ret_errno != 0){

2245

errno = ret_errno;

2246

perror_plus("Failed to lower privileges");

2247

}

2248

}

2249

2250

/* Close the socket */

2251

int ret = close(sd);

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

2256

if(ret_setflags == -1){

2257

errno = ioctl_errno;

2258

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2259

errno = old_errno;

2260

return ioctl_errno;

2261

}

2262

} else if(debug){

2263

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2264

interface);

2265

}

2266

2267

errno = old_errno;

2268

return 0;

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

2269

1475

}

2270

1476

2271

1477

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

2272

mandos_context mc = { .server = NULL, .dh_bits = 0,

2273

.priority = "SECURE256:!CTYPE-X.509"

2274

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2275

.current_server = NULL, .interfaces = NULL,

2276

.interfaces_size = 0 };

2277

1478

AvahiSServiceBrowser *sb = NULL;

2278

error_t ret_errno;

1479

int error;

2279

1480

int ret;

2280

1481

intmax_t tmpmax;

2281

1482

char *tmp;

2282

1483

int exitcode = EXIT_SUCCESS;

2283

char *interfaces_to_take_down = NULL;

2284

size_t interfaces_to_take_down_size = 0;

2285

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2286

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

2287

char *tempdir = NULL;

1484

const char *interface = "";

1485

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

1488

uid_t uid;

1489

gid_t gid;

1490

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

1491

bool tempdir_created = false;

2288

1492

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2289

1493

const char *seckey = PATHDIR "/" SECKEY;

2290

1494

const char *pubkey = PATHDIR "/" PUBKEY;

2291

const char *dh_params_file = NULL;

2292

char *interfaces_hooks = NULL;

2293

1495

2294

1496

bool gnutls_initialized = false;

2295

1497

bool gpgme_initialized = false;

2347

1549

.doc = "Bit length of the prime number used in the"

2348

1550

" Diffie-Hellman key exchange",

2349

1551

.group = 2 },

2350

{ .name = "dh-params", .key = 134,

2351

.arg = "FILE",

2352

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2353

" for the Diffie-Hellman key exchange",

2354

.group = 2 },

2355

1552

{ .name = "priority", .key = 130,

2356

1553

.arg = "STRING",

2357

1554

.doc = "GnuTLS priority string for the TLS handshake",

2362

1559

.group = 2 },

2363

1560

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

2364

1561

.arg = "SECONDS",

2365

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

1562

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

2366

1563

.group = 2 },

2367

1564

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

2368

1565

.arg = "DIR",

2391

1588

connect_to = arg;

2392

1589

break;

2393

1590

case 'i': /* --interface */

2394

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2395

arg, (int)',');

2396

if(ret_errno != 0){

2397

argp_error(state, "%s", strerror(ret_errno));

2398

}

1591

interface = arg;

2399

1592

break;

2400

1593

case 's': /* --seckey */

2401

1594

seckey = arg;

2412

1605

}

2413

1606

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2414

1607

break;

2415

case 134: /* --dh-params */

2416

dh_params_file = arg;

2417

break;

2418

1608

case 130: /* --priority */

2419

1609

mc.priority = arg;

2420

1610

break;

2447

1637

argp_state_help(state, state->out_stream,

2448

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2449

1639

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

2450

1642

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

2451

1643

exit(argp_err_exit_status);

2452

1644

break;

2476

1668

goto end;

2477

1669

}

2478

1670

}

2479

1671

2480

1672

{

2481

1673

/* Work around Debian bug #633582:

2482

1674

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

2483

2484

/* Re-raise privileges */

2485

ret_errno = raise_privileges();

2486

if(ret_errno != 0){

2487

errno = ret_errno;

2488

perror_plus("Failed to raise privileges");

2489

} else {

2490

struct stat st;

2491

2492

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

2493

int seckey_fd = open(seckey, O_RDONLY);

2494

if(seckey_fd == -1){

2495

perror_plus("open");

2496

} else {

2497

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

2498

if(ret == -1){

2499

perror_plus("fstat");

2500

} else {

2501

if(S_ISREG(st.st_mode)

2502

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

2503

ret = fchown(seckey_fd, uid, gid);

2504

if(ret == -1){

2505

perror_plus("fchown");

2506

}

2507

}

2508

}

2509

close(seckey_fd);

2510

}

2511

}

2512

2513

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

2514

int pubkey_fd = open(pubkey, O_RDONLY);

2515

if(pubkey_fd == -1){

2516

perror_plus("open");

2517

} else {

2518

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

2519

if(ret == -1){

2520

perror_plus("fstat");

2521

} else {

2522

if(S_ISREG(st.st_mode)

2523

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

2524

ret = fchown(pubkey_fd, uid, gid);

2525

if(ret == -1){

2526

perror_plus("fchown");

2527

}

2528

}

2529

}

2530

close(pubkey_fd);

2531

}

2532

}

2533

2534

if(dh_params_file != NULL

2535

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2536

int dhparams_fd = open(dh_params_file, O_RDONLY);

2537

if(dhparams_fd == -1){

2538

perror_plus("open");

2539

} else {

2540

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

2541

if(ret == -1){

2542

perror_plus("fstat");

2543

} else {

2544

if(S_ISREG(st.st_mode)

2545

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

2546

ret = fchown(dhparams_fd, uid, gid);

2547

if(ret == -1){

2548

perror_plus("fchown");

2549

}

2550

}

2551

}

2552

close(dhparams_fd);

2553

}

2554

}

2555

2556

/* Lower privileges */

2557

ret_errno = lower_privileges();

2558

if(ret_errno != 0){

2559

errno = ret_errno;

2560

perror_plus("Failed to lower privileges");

2561

}

2562

}

2563

}

2564

2565

/* Remove invalid interface names (except "none") */

2566

{

2567

char *interface = NULL;

2568

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2569

interface))){

2570

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

2571

and if_nametoindex(interface) == 0){

2572

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

2573

fprintf_plus(stderr, "Not using nonexisting interface"

2574

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

2575

}

2576

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2577

interface = NULL;

2578

}

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2579

1731

}

2580

1732

}

2581

1733

2582

1734

/* Run network hooks */

2583

1735

{

2584

if(mc.interfaces != NULL){

2585

interfaces_hooks = malloc(mc.interfaces_size);

2586

if(interfaces_hooks == NULL){

2587

perror_plus("malloc");

2588

goto end;

2589

}

2590

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2591

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2592

}

2593

run_network_hooks("start", interfaces_hooks != NULL ?

2594

interfaces_hooks : "", delay);

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

2595

1751

}

2596

1752

2597

1753

if(not debug){

2598

1754

avahi_set_log_function(empty_log);

2599

1755

}

2600

1756

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

2601

1789

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

2602

1790

from the signal handler */

2603

1791

/* Initialize the pseudo-RNG for Avahi */

2604

1792

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

2605

simple_poll = avahi_simple_poll_new();

2606

if(simple_poll == NULL){

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2607

1795

fprintf_plus(stderr,

2608

1796

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

2609

1797

exitcode = EX_UNAVAILABLE;

2673

1861

}

2674

1862

}

2675

1863

2676

/* If no interfaces were specified, make a list */

2677

if(mc.interfaces == NULL){

2678

struct dirent **direntries = NULL;

2679

/* Look for any good interfaces */

2680

ret = scandir(sys_class_net, &direntries, good_interface,

2681

alphasort);

2682

if(ret >= 1){

2683

/* Add all found interfaces to interfaces list */

2684

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

2685

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2686

direntries[i]->d_name);

2687

if(ret_errno != 0){

2688

errno = ret_errno;

2689

perror_plus("argz_add");

2690

free(direntries[i]);

2691

continue;

2692

}

2693

if(debug){

2694

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2695

direntries[i]->d_name);

2696

}

2697

free(direntries[i]);

2698

}

2699

free(direntries);

2700

} else {

2701

if(ret == 0){

2702

free(direntries);

2703

}

2704

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

2705

exitcode = EXIT_FAILURE;

2706

goto end;

2707

}

2708

}

2709

2710

/* Bring up interfaces which are down, and remove any "none"s */

2711

{

2712

char *interface = NULL;

2713

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2714

interface))){

2715

/* If interface name is "none", stop bringing up interfaces.

2716

Also remove all instances of "none" from the list */

2717

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

2718

argz_delete(&mc.interfaces, &mc.interfaces_size,

2719

interface);

2720

interface = NULL;

2721

while((interface = argz_next(mc.interfaces,

2722

mc.interfaces_size, interface))){

2723

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

2724

argz_delete(&mc.interfaces, &mc.interfaces_size,

2725

interface);

2726

interface = NULL;

1864

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1884

#ifdef __linux__

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

messages about the network interface to mess up the prompt */

1887

ret = klogctl(8, NULL, 5);

1888

bool restore_loglevel = true;

1889

if(ret == -1){

1890

restore_loglevel = false;

1891

perror_plus("klogctl");

1892

}

1893

#endif /* __linux__ */

1894

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1899

#ifdef __linux__

1900

if(restore_loglevel){

1901

ret = klogctl(7, NULL, 0);

1902

if(ret == -1){

1903

perror_plus("klogctl");

1904

}

1905

}

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

goto end;

1914

}

1915

strcpy(network.ifr_name, interface);

1916

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

1917

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1919

#ifdef __linux__

1920

if(restore_loglevel){

1921

ret = klogctl(7, NULL, 0);

1922

if(ret == -1){

1923

perror_plus("klogctl");

1924

}

1925

}

1926

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

if((network.ifr_flags & IFF_UP) == 0){

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

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

1940

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

2727

1949

}

2728

1950

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

2729

1968

break;

2730

1969

}

2731

bool interface_was_up = interface_is_up(interface);

2732

errno = bring_up_interface(interface, delay);

2733

if(not interface_was_up){

2734

if(errno != 0){

2735

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2736

" %s\n", interface, strerror(errno));

2737

} else {

2738

errno = argz_add(&interfaces_to_take_down,

2739

&interfaces_to_take_down_size,

2740

interface);

2741

if(errno != 0){

2742

perror_plus("argz_add");

2743

}

2744

}

2745

}

2746

}

2747

if(debug and (interfaces_to_take_down == NULL)){

2748

fprintf_plus(stderr, "No interfaces were brought up\n");

2749

}

2750

}

2751

2752

/* If we only got one interface, explicitly use only that one */

2753

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2754

if(debug){

2755

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2756

mc.interfaces);

2757

}

2758

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

ret = nanosleep(&sleeptime, NULL);

1972

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

1973

perror_plus("nanosleep");

1974

}

1975

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

}

1983

#ifdef __linux__

1984

if(restore_loglevel){

1985

/* Restores kernel loglevel to default */

1986

ret = klogctl(7, NULL, 0);

1987

if(ret == -1){

1988

perror_plus("klogctl");

1989

}

1990

}

1991

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

2759

1999

}

2760

2000

2761

2001

if(quit_now){

2762

2002

goto end;

2763

2003

}

2764

2004

2765

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

2005

ret = init_gnutls_global(pubkey, seckey);

2766

2006

if(ret == -1){

2767

2007

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

2768

2008

exitcode = EX_UNAVAILABLE;

2775

2015

goto end;

2776

2016

}

2777

2017

2778

/* Try /run/tmp before /tmp */

2779

tempdir = mkdtemp(run_tempdir);

2780

if(tempdir == NULL and errno == ENOENT){

2781

if(debug){

2782

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2783

run_tempdir, old_tempdir);

2784

}

2785

tempdir = mkdtemp(old_tempdir);

2786

}

2787

if(tempdir == NULL){

2018

if(mkdtemp(tempdir) == NULL){

2788

2019

perror_plus("mkdtemp");

2789

2020

goto end;

2790

2021

}

2022

tempdir_created = true;

2791

2023

2792

2024

if(quit_now){

2793

2025

goto end;

2794

2026

}

2795

2027

2796

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

2028

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

2797

2029

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

2798

2030

exitcode = EX_UNAVAILABLE;

2799

2031

goto end;

2809

2041

/* Connect directly, do not use Zeroconf */

2810

2042

/* (Mainly meant for debugging) */

2811

2043

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

2812

2813

2044

if(address == NULL){

2814

2045

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

2815

2046

exitcode = EX_USAGE;

2820

2051

goto end;

2821

2052

}

2822

2053

2823

in_port_t port;

2054

uint16_t port;

2824

2055

errno = 0;

2825

2056

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

2826

2057

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

2827

or tmpmax != (in_port_t)tmpmax){

2058

or tmpmax != (uint16_t)tmpmax){

2828

2059

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

2829

2060

exitcode = EX_USAGE;

2830

2061

goto end;

2831

2062

}

2832

2063

2833

2064

if(quit_now){

2834

2065

goto end;

2835

2066

}

2836

2067

2837

port = (in_port_t)tmpmax;

2068

port = (uint16_t)tmpmax;

2838

2069

*address = '\0';

2839

2070

/* Colon in address indicates IPv6 */

2840

2071

int af;

2856

2087

}

2857

2088

2858

2089

while(not quit_now){

2859

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

2860

&mc);

2090

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

2861

2091

if(quit_now or ret == 0){

2862

2092

break;

2863

2093

}

2865

2095

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

2866

2096

(int)retry_interval);

2867

2097

}

2868

sleep((unsigned int)retry_interval);

2098

sleep((int)retry_interval);

2869

2099

}

2870

2100

2871

if(not quit_now){

2101

if (not quit_now){

2872

2102

exitcode = EXIT_SUCCESS;

2873

2103

}

2874

2104

2889

2119

config.publish_domain = 0;

2890

2120

2891

2121

/* Allocate a new server */

2892

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2893

&config, NULL, NULL, &ret_errno);

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2894

2125

2895

2126

/* Free the Avahi configuration data */

2896

2127

avahi_server_config_free(&config);

2899

2130

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

2900

2131

if(mc.server == NULL){

2901

2132

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

2902

avahi_strerror(ret_errno));

2133

avahi_strerror(error));

2903

2134

exitcode = EX_UNAVAILABLE;

2904

2135

goto end;

2905

2136

}

2911

2142

/* Create the Avahi service browser */

2912

2143

sb = avahi_s_service_browser_new(mc.server, if_index,

2913

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2914

NULL, 0, browse_callback,

2915

(void *)&mc);

2145

NULL, 0, browse_callback, NULL);

2916

2146

if(sb == NULL){

2917

2147

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

2918

2148

avahi_strerror(avahi_server_errno(mc.server)));

2929

2159

if(debug){

2930

2160

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

2931

2161

}

2932

2933

ret = avahi_loop_with_timeout(simple_poll,

2934

(int)(retry_interval * 1000), &mc);

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2935

2165

if(debug){

2936

2166

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

2937

2167

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

2944

2174

}

2945

2175

2946

2176

/* Cleanup things */

2947

free(mc.interfaces);

2948

2949

2177

if(sb != NULL)

2950

2178

avahi_s_service_browser_free(sb);

2951

2179

2952

2180

if(mc.server != NULL)

2953

2181

avahi_server_free(mc.server);

2954

2182

2955

if(simple_poll != NULL)

2956

avahi_simple_poll_free(simple_poll);

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2957

2185

2958

2186

if(gnutls_initialized){

2959

2187

gnutls_certificate_free_credentials(mc.cred);

2188

gnutls_global_deinit();

2960

2189

gnutls_dh_params_deinit(mc.dh_params);

2961

2190

}

2962

2191

2963

2192

if(gpgme_initialized){

2964

2193

gpgme_release(mc.ctx);

2965

2194

}

2966

2195

2967

2196

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

2968

2197

has seen */

2969

2198

if(mc.current_server != NULL){

2970

2199

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

2971

2200

while(mc.current_server != NULL){

2972

2201

server *next = mc.current_server->next;

2973

#ifdef __GNUC__

2974

#pragma GCC diagnostic push

2975

#pragma GCC diagnostic ignored "-Wcast-qual"

2976

#endif

2977

free((char *)(mc.current_server->ip));

2978

#ifdef __GNUC__

2979

#pragma GCC diagnostic pop

2980

#endif

2981

2202

free(mc.current_server);

2982

2203

mc.current_server = next;

2983

2204

}

2984

2205

}

2985

2206

2986

/* Re-raise privileges */

2207

/* Re-raise priviliges */

2987

2208

{

2988

ret_errno = raise_privileges();

2989

if(ret_errno != 0){

2990

errno = ret_errno;

2991

perror_plus("Failed to raise privileges");

2992

} else {

2993

2994

/* Run network hooks */

2995

run_network_hooks("stop", interfaces_hooks != NULL ?

2996

interfaces_hooks : "", delay);

2997

2998

/* Take down the network interfaces which were brought up */

2999

{

3000

char *interface = NULL;

3001

while((interface=argz_next(interfaces_to_take_down,

3002

interfaces_to_take_down_size,

3003

interface))){

3004

ret_errno = take_down_interface(interface);

3005

if(ret_errno != 0){

3006

errno = ret_errno;

3007

perror_plus("Failed to take down interface");

3008

}

3009

}

3010

if(debug and (interfaces_to_take_down == NULL)){

3011

fprintf_plus(stderr, "No interfaces needed to be taken"

3012

" down\n");

3013

}

3014

}

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

3015

2217

}

3016

2218

3017

ret_errno = lower_privileges_permanently();

3018

if(ret_errno != 0){

3019

errno = ret_errno;

3020

perror_plus("Failed to lower privileges permanently");

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

3021

2235

}

3022

2236

}

3023

3024

free(interfaces_to_take_down);

3025

free(interfaces_hooks);

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

3026

2243

3027

2244

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

3028

if(tempdir != NULL){

2245

if(tempdir_created){

3029

2246

struct dirent **direntries = NULL;

3030

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3031

| O_NOFOLLOW

3032

| O_DIRECTORY

3033

| O_PATH));

3034

if(tempdir_fd == -1){

3035

perror_plus("open");

3036

} else {

3037

int numentries = scandirat(tempdir_fd, ".", &direntries,

3038

notdotentries, alphasort);

3039

if(numentries >= 0){

3040

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

3041

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3042

if(ret == -1){

3043

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3044

" \"%s\", 0): %s\n", tempdir,

3045

direntries[i]->d_name, strerror(errno));

3046

}

3047

free(direntries[i]);

3048

}

3049

3050

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

3051

free(direntries);

3052

if(numentries == -1){

3053

perror_plus("scandir");

3054

}

3055

ret = rmdir(tempdir);

3056

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

3057

perror_plus("rmdir");

3058

}

2247

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

2252

direntry = direntries[i];

2253

char *fullname = NULL;

2254

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

2255

direntry->d_name);

2256

if(ret < 0){

2257

perror_plus("asprintf");

2258

continue;

2259

}

2260

ret = remove(fullname);

2261

if(ret == -1){

2262

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

2263

strerror(errno));

2264

}

2265

free(fullname);

3059

2266

}

3060

close(tempdir_fd);

2267

}

2268

2269

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

2270

free(direntries);

2271

if (numentries == -1){

2272

perror_plus("scandir");

2273

}

2274

ret = rmdir(tempdir);

2275

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

2276

perror_plus("rmdir");

3061

2277

}

3062

2278

}

3063

2279