/mandos/release : revision 237.7.360

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

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

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

49

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

50

asprintf(), strncpy() */

51

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

52

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

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sockaddr_in6, PF_INET6,

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

59

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

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inet_pton(), connect(),

59

getnameinfo() */

60

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

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61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

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

77

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

76

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

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

177

185

perror(print_text);

178

186

}

179

187

180

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

188

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

181

189

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

182

190

va_list ap;

183

191

va_start (ap, format);

184

192

185

193

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

186

194

program_invocation_short_name));

187

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

195

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

188

196

}

189

197

190

198

/*

192

200

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

193

201

* "buffer_length" is how much is already used.

194

202

*/

203

__attribute__((nonnull, warn_unused_result))

195

204

size_t incbuffer(char **buffer, size_t buffer_length,

196

205

size_t buffer_capacity){

197

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

if(buffer == NULL){

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;

200

213

return 0;

201

214

}

215

*buffer = new_buf;

202

216

buffer_capacity += BUFFER_SIZE;

203

217

}

204

218

return buffer_capacity;

205

219

}

206

220

207

221

/* 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){

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){

210

225

int ret;

211

226

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

212

227

if(new_server == NULL){

219

234

.af = af };

220

235

if(new_server->ip == NULL){

221

236

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);

222

252

return false;

223

253

}

224

254

/* Special case of first server */

225

if (mc.current_server == NULL){

255

if(*current_server == NULL){

226

256

new_server->next = new_server;

227

257

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

258

*current_server = new_server;

230

259

} else {

231

new_server->next = mc.current_server;

232

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

260

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

261

new_server->next = *current_server;

262

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

233

263

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

264

(*current_server)->prev = new_server;

240

265

}

241

266

return true;

242

267

}

244

269

/*

245

270

* Initialize GPGME.

246

271

*/

247

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

248

const char *tempdir){

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){

249

277

gpgme_error_t rc;

250

278

gpgme_engine_info_t engine_info;

251

279

252

253

280

/*

254

281

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

255

282

*/

256

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

257

284

int ret;

258

285

int fd;

259

286

gpgme_data_t pgp_data;

271

298

return false;

272

299

}

273

300

274

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

275

302

if(rc != GPG_ERR_NO_ERROR){

276

303

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

277

304

gpgme_strsource(rc), gpgme_strerror(rc));

278

305

return false;

279

306

}

280

307

281

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

308

ret = close(fd);

282

309

if(ret == -1){

283

310

perror_plus("close");

284

311

}

321

348

}

322

349

323

350

/* Create new GPGME "context" */

324

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

351

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

325

352

if(rc != GPG_ERR_NO_ERROR){

326

353

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

327

354

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

340

367

* Decrypt OpenPGP data.

341

368

* Returns -1 on error

342

369

*/

370

__attribute__((nonnull, warn_unused_result))

343

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

372

size_t crypto_size,

345

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

346

375

gpgme_data_t dh_crypto, dh_plain;

347

376

gpgme_error_t rc;

348

377

ssize_t ret;

374

403

375

404

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

376

405

data buffer */

377

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

406

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

378

407

if(rc != GPG_ERR_NO_ERROR){

379

408

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

380

409

gpgme_strsource(rc), gpgme_strerror(rc));

381

410

plaintext_length = -1;

382

411

if(debug){

383

412

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

385

414

if(result == NULL){

386

415

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

387

416

} else {

464

493

return plaintext_length;

465

494

}

466

495

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

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);

473

507

}

474

508

475

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

476

511

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

477

512

const char* string){

478

513

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

479

514

}

480

515

516

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

481

517

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

483

521

int ret;

522

unsigned int uret;

484

523

485

524

if(debug){

486

525

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

487

526

}

488

527

489

ret = gnutls_global_init();

490

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

493

return -1;

494

}

495

496

528

if(debug){

497

529

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

498

530

* - GnuTLS manual

502

534

}

503

535

504

536

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

538

if(ret != GNUTLS_E_SUCCESS){

507

539

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

508

540

safer_gnutls_strerror(ret));

509

gnutls_global_deinit();

510

541

return -1;

511

542

}

512

543

518

549

}

519

550

520

551

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

552

(mc->cred, pubkeyfilename, seckeyfilename,

522

553

GNUTLS_OPENPGP_FMT_BASE64);

523

554

if(ret != GNUTLS_E_SUCCESS){

524

555

fprintf_plus(stderr,

530

561

}

531

562

532

563

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

564

ret = gnutls_dh_params_init(&mc->dh_params);

534

565

if(ret != GNUTLS_E_SUCCESS){

535

566

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

567

" initialization: %s\n",

537

568

safer_gnutls_strerror(ret));

538

569

goto globalfail;

539

570

}

540

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

541

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

544

goto globalfail;

545

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

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);

548

744

549

745

return 0;

550

746

551

747

globalfail:

552

748

553

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

749

gnutls_certificate_free_credentials(mc->cred);

750

gnutls_dh_params_deinit(mc->dh_params);

556

751

return -1;

557

752

}

558

753

559

static int init_gnutls_session(gnutls_session_t *session){

754

__attribute__((nonnull, warn_unused_result))

755

static int init_gnutls_session(gnutls_session_t *session,

756

mandos_context *mc){

560

757

int ret;

561

758

/* GnuTLS session creation */

562

759

do {

574

771

{

575

772

const char *err;

576

773

do {

577

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

774

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

578

775

if(quit_now){

579

776

gnutls_deinit(*session);

580

777

return -1;

591

788

592

789

do {

593

790

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

791

mc->cred);

595

792

if(quit_now){

596

793

gnutls_deinit(*session);

597

794

return -1;

607

804

/* ignore client certificate if any. */

608

805

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

806

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

611

612

807

return 0;

613

808

}

614

809

616

811

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

617

812

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

618

813

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

619

1032

/* Called when a Mandos server is found */

620

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

1033

__attribute__((nonnull, warn_unused_result))

1034

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

621

1035

AvahiIfIndex if_index,

622

int af){

1036

int af, mandos_context *mc){

623

1037

int ret, tcp_sd = -1;

624

1038

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

1039

struct sockaddr_storage to;

629

1040

char *buffer = NULL;

630

1041

char *decrypted_buffer = NULL;

631

1042

size_t buffer_length = 0;

634

1045

int retval = -1;

635

1046

gnutls_session_t session;

636

1047

int pf; /* Protocol family */

1048

bool route_added = false;

637

1049

638

1050

errno = 0;

639

1051

655

1067

return -1;

656

1068

}

657

1069

658

ret = init_gnutls_session(&session);

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);

659

1103

if(ret != 0){

660

1104

return -1;

661

1105

}

662

1106

663

1107

if(debug){

664

1108

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

665

PRIu16 "\n", ip, port);

1109

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

666

1110

}

667

1111

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

1112

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

669

1113

if(tcp_sd < 0){

670

1114

int e = errno;

671

1115

perror_plus("socket");

678

1122

goto mandos_end;

679

1123

}

680

1124

681

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

682

1125

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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

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);

685

1129

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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

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);

688

1133

}

689

1134

if(ret < 0 ){

690

1135

int e = errno;

699

1144

goto mandos_end;

700

1145

}

701

1146

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

1147

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

1148

if(IN6_IS_ADDR_LINKLOCAL

1149

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

709

1150

if(if_index == AVAHI_IF_UNSPEC){

710

1151

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

711

1152

" incomplete without a network interface\n");

713

1154

goto mandos_end;

714

1155

}

715

1156

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

1157

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

717

1158

}

718

1159

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

1160

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

722

1161

}

723

1162

724

1163

if(quit_now){

732

1171

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

733

1172

perror_plus("if_indextoname");

734

1173

} else {

735

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

736

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

1174

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

1175

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

737

1176

}

738

1177

} else {

739

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

740

ip, port);

1178

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

1179

ip, (uintmax_t)port);

741

1180

}

742

1181

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

1182

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

748

} else {

749

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

750

sizeof(addrstr));

751

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

758

}

759

}

760

761

if(quit_now){

762

errno = EINTR;

763

goto mandos_end;

764

}

765

766

if(af == AF_INET6){

767

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

768

} else {

769

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

770

}

771

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

777

goto mandos_end;

778

}

779

780

if(quit_now){

781

errno = EINTR;

782

goto mandos_end;

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;

783

1263

}

784

1264

785

1265

const char *out = mandos_protocol_version;

936

1416

if(buffer_length > 0){

937

1417

ssize_t decrypted_buffer_size;

938

1418

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

939

&decrypted_buffer);

1419

&decrypted_buffer, mc);

940

1420

if(decrypted_buffer_size >= 0){

941

1421

942

1422

written = 0;

968

1448

969

1449

mandos_end:

970

1450

{

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

}

971

1457

int e = errno;

972

1458

free(decrypted_buffer);

973

1459

free(buffer);

974

1460

if(tcp_sd >= 0){

975

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

1461

ret = close(tcp_sd);

976

1462

}

977

1463

if(ret == -1){

978

1464

if(e == 0){

990

1476

return retval;

991

1477

}

992

1478

1479

__attribute__((nonnull))

993

1480

static void resolve_callback(AvahiSServiceResolver *r,

994

1481

AvahiIfIndex interface,

995

1482

AvahiProtocol proto,

1003

1490

AVAHI_GCC_UNUSED AvahiStringList *txt,

1004

1491

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1005

1492

flags,

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1493

void *mc){

1494

if(r == NULL){

1495

return;

1496

}

1008

1497

1009

1498

/* Called whenever a service has been resolved successfully or

1010

1499

timed out */

1011

1500

1012

1501

if(quit_now){

1502

avahi_s_service_resolver_free(r);

1013

1503

return;

1014

1504

}

1015

1505

1019

1509

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

1020

1510

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

1021

1511

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

1512

avahi_strerror(avahi_server_errno

1513

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

1023

1514

break;

1024

1515

1025

1516

case AVAHI_RESOLVER_FOUND:

1031

1522

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

1032

1523

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

1033

1524

}

1034

int ret = start_mandos_communication(ip, port, interface,

1035

avahi_proto_to_af(proto));

1525

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

1526

interface,

1527

avahi_proto_to_af(proto),

1528

mc);

1036

1529

if(ret == 0){

1037

avahi_simple_poll_quit(mc.simple_poll);

1530

avahi_simple_poll_quit(simple_poll);

1038

1531

} else {

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1532

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

1533

avahi_proto_to_af(proto),

1534

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

1041

1535

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

1042

1536

" list\n", name);

1043

1537

}

1056

1550

const char *domain,

1057

1551

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1552

flags,

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1553

void *mc){

1554

if(b == NULL){

1555

return;

1556

}

1061

1557

1062

1558

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

1063

1559

is removed from the LAN */

1071

1567

case AVAHI_BROWSER_FAILURE:

1072

1568

1073

1569

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

avahi_simple_poll_quit(mc.simple_poll);

1570

avahi_strerror(avahi_server_errno

1571

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

1572

avahi_simple_poll_quit(simple_poll);

1076

1573

return;

1077

1574

1078

1575

case AVAHI_BROWSER_NEW:

1081

1578

the callback function is called the Avahi server will free the

1082

1579

resolver for us. */

1083

1580

1084

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

1085

name, type, domain, protocol, 0,

1086

resolve_callback, NULL) == NULL)

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)

1087

1585

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

1088

1586

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1587

avahi_strerror(avahi_server_errno

1588

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

1090

1589

break;

1091

1590

1092

1591

case AVAHI_BROWSER_REMOVE:

1111

1610

signal_received = sig;

1112

1611

int old_errno = errno;

1113

1612

/* set main loop to exit */

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1613

if(simple_poll != NULL){

1614

avahi_simple_poll_quit(simple_poll);

1116

1615

}

1117

1616

errno = old_errno;

1118

1617

}

1119

1618

1619

__attribute__((nonnull, warn_unused_result))

1120

1620

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

1121

1621

int ret;

1622

error_t ret_errno;

1122

1623

1123

1624

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

1124

1625

if(s < 0){

1626

ret_errno = errno;

1125

1627

perror_plus("socket");

1628

errno = ret_errno;

1126

1629

return false;

1127

1630

}

1128

strcpy(ifr->ifr_name, ifname);

1631

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

1632

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

1129

1633

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

1634

if(ret == -1){

1131

1635

if(debug){

1636

ret_errno = errno;

1132

1637

perror_plus("ioctl SIOCGIFFLAGS");

1638

errno = ret_errno;

1133

1639

}

1134

1640

return false;

1135

1641

}

1136

1642

return true;

1137

1643

}

1138

1644

1645

__attribute__((nonnull, warn_unused_result))

1139

1646

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

1140

1647

1141

1648

/* Reject the loopback device */

1183

1690

* corresponds to an acceptable network device.

1184

1691

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

1185

1692

*/

1693

__attribute__((nonnull, warn_unused_result))

1186

1694

int good_interface(const struct dirent *if_entry){

1187

1695

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

1188

1696

return 0;

1204

1712

}

1205

1713

1206

1714

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

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))

1249

1749

int notdotentries(const struct dirent *direntry){

1250

1750

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

1251

1751

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

1258

1758

}

1259

1759

1260

1760

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

1761

__attribute__((nonnull, warn_unused_result))

1261

1762

int runnable_hook(const struct dirent *direntry){

1262

1763

int ret;

1263

1764

size_t sret;

1271

1772

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

1272

1773

"abcdefghijklmnopqrstuvwxyz"

1273

1774

"0123456789"

1274

"_-");

1775

"_.-");

1275

1776

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

1276

1777

/* Contains non-allowed characters */

1277

1778

if(debug){

1281

1782

return 0;

1282

1783

}

1283

1784

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1785

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

1292

1786

if(ret == -1){

1293

1787

if(debug){

1294

1788

perror_plus("Could not stat hook");

1318

1812

return 1;

1319

1813

}

1320

1814

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1815

__attribute__((nonnull, warn_unused_result))

1816

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1817

mandos_context *mc){

1322

1818

int ret;

1323

1819

struct timespec now;

1324

1820

struct timespec waited_time;

1325

1821

intmax_t block_time;

1326

1822

1327

1823

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1824

if(mc->current_server == NULL){

1825

if(debug){

1330

1826

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

1331

1827

" No timeout!\n");

1332

1828

}

1333

1829

ret = avahi_simple_poll_iterate(s, -1);

1334

1830

} else {

1335

if (debug){

1831

if(debug){

1336

1832

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

1337

1833

" it, or wait\n");

1338

1834

}

1345

1841

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

1346

1842

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

1347

1843

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1844

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

1349

1845

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1846

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

1351

1847

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

1352

1848

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

1353

1849

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

1355

1851

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

1356

1852

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

1357

1853

1358

if (debug){

1854

if(debug){

1359

1855

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

1360

1856

block_time);

1361

1857

}

1362

1858

1363

1859

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

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);

1368

1864

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1865

avahi_simple_poll_quit(s);

1370

1866

return 0;

1371

1867

}

1372

1868

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1869

&mc->current_server->last_seen);

1374

1870

if(ret == -1){

1375

1871

perror_plus("clock_gettime");

1376

1872

return -1;

1377

1873

}

1378

mc.current_server = mc.current_server->next;

1874

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

1379

1875

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

1380

1876

servers, but don't block */

1381

1877

}

1383

1879

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

1384

1880

}

1385

1881

if(ret != 0){

1386

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

1882

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

1387

1883

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

1388

1884

}

1389

1885

}

1390

1886

}

1391

1887

}

1392

1888

1393

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

1889

__attribute__((nonnull))

1890

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

1394

1891

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

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);

1400

1910

if(numhooks == -1){

1401

1911

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

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){

1409

1973

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1478

1978

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

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;

1527

2269

}

1528

2270

1529

2271

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 };

1530

2277

AvahiSServiceBrowser *sb = NULL;

1531

int error;

2278

error_t ret_errno;

1532

2279

int ret;

1533

2280

intmax_t tmpmax;

1534

2281

char *tmp;

1535

2282

int exitcode = EXIT_SUCCESS;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1542

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

1543

bool tempdir_created = false;

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;

1544

2288

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1545

2289

const char *seckey = PATHDIR "/" SECKEY;

1546

2290

const char *pubkey = PATHDIR "/" PUBKEY;

2291

const char *dh_params_file = NULL;

2292

char *interfaces_hooks = NULL;

1547

2293

1548

2294

bool gnutls_initialized = false;

1549

2295

bool gpgme_initialized = false;

1601

2347

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

1602

2348

" Diffie-Hellman key exchange",

1603

2349

.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 },

1604

2355

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

1605

2356

.arg = "STRING",

1606

2357

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

1640

2391

connect_to = arg;

1641

2392

break;

1642

2393

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

1643

interface = arg;

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

}

1644

2399

break;

1645

2400

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

1646

2401

seckey = arg;

1657

2412

}

1658

2413

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

1659

2414

break;

2415

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

2416

dh_params_file = arg;

2417

break;

1660

2418

case 130: /* --priority */

1661

2419

mc.priority = arg;

1662

2420

break;

1718

2476

goto end;

1719

2477

}

1720

2478

}

1721

2479

1722

2480

{

1723

2481

/* Work around Debian bug #633582:

1724

2482

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

1725

2483

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

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");

1731

2489

} else {

1732

2490

struct stat st;

1733

2491

1748

2506

}

1749

2507

}

1750

2508

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

2509

close(seckey_fd);

1752

2510

}

1753

2511

}

1754

2512

1755

2513

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

1756

2514

int pubkey_fd = open(pubkey, O_RDONLY);

1757

2515

if(pubkey_fd == -1){

1769

2527

}

1770

2528

}

1771

2529

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

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

1776

2556

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

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;

1781

2578

}

1782

2579

}

1783

2580

}

1784

2581

1785

2582

/* Run network hooks */

1786

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

1787

goto end;

2583

{

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);

1788

2595

}

1789

2596

1790

2597

if(not debug){

1791

2598

avahi_set_log_function(empty_log);

1792

2599

}

1793

2600

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

1826

2601

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

1827

2602

from the signal handler */

1828

2603

/* Initialize the pseudo-RNG for Avahi */

1829

2604

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

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2605

simple_poll = avahi_simple_poll_new();

2606

if(simple_poll == NULL){

1832

2607

fprintf_plus(stderr,

1833

2608

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

1834

2609

exitcode = EX_UNAVAILABLE;

1898

2673

}

1899

2674

}

1900

2675

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

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;

1986

2727

}

1987

2728

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2005

2729

break;

2006

2730

}

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2035

}

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);

2036

2759

}

2037

2760

2038

2761

if(quit_now){

2039

2762

goto end;

2040

2763

}

2041

2764

2042

ret = init_gnutls_global(pubkey, seckey);

2765

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

2043

2766

if(ret == -1){

2044

2767

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

2045

2768

exitcode = EX_UNAVAILABLE;

2052

2775

goto end;

2053

2776

}

2054

2777

2055

if(mkdtemp(tempdir) == NULL){

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){

2056

2788

perror_plus("mkdtemp");

2057

2789

goto end;

2058

2790

}

2059

tempdir_created = true;

2060

2791

2061

2792

if(quit_now){

2062

2793

goto end;

2063

2794

}

2064

2795

2065

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

2796

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

2066

2797

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

2067

2798

exitcode = EX_UNAVAILABLE;

2068

2799

goto end;

2078

2809

/* Connect directly, do not use Zeroconf */

2079

2810

/* (Mainly meant for debugging) */

2080

2811

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

2812

2081

2813

if(address == NULL){

2082

2814

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

2083

2815

exitcode = EX_USAGE;

2088

2820

goto end;

2089

2821

}

2090

2822

2091

uint16_t port;

2823

in_port_t port;

2092

2824

errno = 0;

2093

2825

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

2094

2826

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

2095

or tmpmax != (uint16_t)tmpmax){

2827

or tmpmax != (in_port_t)tmpmax){

2096

2828

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

2097

2829

exitcode = EX_USAGE;

2098

2830

goto end;

2099

2831

}

2100

2832

2101

2833

if(quit_now){

2102

2834

goto end;

2103

2835

}

2104

2836

2105

port = (uint16_t)tmpmax;

2837

port = (in_port_t)tmpmax;

2106

2838

*address = '\0';

2107

2839

/* Colon in address indicates IPv6 */

2108

2840

int af;

2124

2856

}

2125

2857

2126

2858

while(not quit_now){

2127

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

2859

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

2860

&mc);

2128

2861

if(quit_now or ret == 0){

2129

2862

break;

2130

2863

}

2132

2865

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

2133

2866

(int)retry_interval);

2134

2867

}

2135

sleep((int)retry_interval);

2868

sleep((unsigned int)retry_interval);

2136

2869

}

2137

2870

2138

if (not quit_now){

2871

if(not quit_now){

2139

2872

exitcode = EXIT_SUCCESS;

2140

2873

}

2141

2874

2156

2889

config.publish_domain = 0;

2157

2890

2158

2891

/* Allocate a new server */

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2892

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2893

&config, NULL, NULL, &ret_errno);

2162

2894

2163

2895

/* Free the Avahi configuration data */

2164

2896

avahi_server_config_free(&config);

2167

2899

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

2168

2900

if(mc.server == NULL){

2169

2901

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

2170

avahi_strerror(error));

2902

avahi_strerror(ret_errno));

2171

2903

exitcode = EX_UNAVAILABLE;

2172

2904

goto end;

2173

2905

}

2179

2911

/* Create the Avahi service browser */

2180

2912

sb = avahi_s_service_browser_new(mc.server, if_index,

2181

2913

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2182

NULL, 0, browse_callback, NULL);

2914

NULL, 0, browse_callback,

2915

(void *)&mc);

2183

2916

if(sb == NULL){

2184

2917

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

2185

2918

avahi_strerror(avahi_server_errno(mc.server)));

2196

2929

if(debug){

2197

2930

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

2198

2931

}

2199

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2932

2933

ret = avahi_loop_with_timeout(simple_poll,

2934

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

2202

2935

if(debug){

2203

2936

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

2204

2937

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

2211

2944

}

2212

2945

2213

2946

/* Cleanup things */

2947

free(mc.interfaces);

2948

2214

2949

if(sb != NULL)

2215

2950

avahi_s_service_browser_free(sb);

2216

2951

2217

2952

if(mc.server != NULL)

2218

2953

avahi_server_free(mc.server);

2219

2954

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2955

if(simple_poll != NULL)

2956

avahi_simple_poll_free(simple_poll);

2222

2957

2223

2958

if(gnutls_initialized){

2224

2959

gnutls_certificate_free_credentials(mc.cred);

2225

gnutls_global_deinit();

2226

2960

gnutls_dh_params_deinit(mc.dh_params);

2227

2961

}

2228

2962

2236

2970

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

2237

2971

while(mc.current_server != NULL){

2238

2972

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

2239

2981

free(mc.current_server);

2240

2982

mc.current_server = next;

2241

2983

}

2242

2984

}

2243

2985

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2986

/* Re-raise privileges */

2248

2987

{

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

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

}

2253

3015

}

2254

3016

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

}

2266

}

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

3017

ret_errno = lower_privileges_permanently();

3018

if(ret_errno != 0){

3019

errno = ret_errno;

3020

perror_plus("Failed to lower privileges permanently");

2271

3021

}

2272

3022

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

3023

3024

free(interfaces_to_take_down);

3025

free(interfaces_hooks);

2279

3026

2280

3027

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

2281

if(tempdir_created){

3028

if(tempdir != NULL){

2282

3029

struct dirent **direntries = NULL;

2283

struct dirent *direntry = NULL;

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

2288

direntry = direntries[i];

2289

char *fullname = NULL;

2290

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

2291

direntry->d_name);

2292

if(ret < 0){

2293

perror_plus("asprintf");

2294

continue;

2295

}

2296

ret = remove(fullname);

2297

if(ret == -1){

2298

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

2299

strerror(errno));

2300

}

2301

free(fullname);

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

}

2302

3059

}

2303

}

2304

2305

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

2306

free(direntries);

2307

if (numentries == -1){

2308

perror_plus("scandir");

2309

}

2310

ret = rmdir(tempdir);

2311

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

2312

perror_plus("rmdir");

3060

close(tempdir_fd);

2313

3061

}

2314

3062

}

2315

3063