/mandos/trunk : revision 750

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(),

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

73

*/

74

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

75

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

76

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

76

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

77

unlinkat() */

77

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

141

142

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

142

143

char *connect_to = NULL;

143

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

144

146

uid_t uid = 65534;

145

147

gid_t gid = 65534;

146

148

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

216

219

}

217

220

218

221

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

222

__attribute__((nonnull, warn_unused_result))

219

223

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

220

224

int af, server **current_server){

221

225

int ret;

230

234

.af = af };

231

235

if(new_server->ip == NULL){

232

236

perror_plus("strdup");

237

free(new_server);

233

238

return false;

234

239

}

235

240

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

236

241

if(ret == -1){

237

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);

238

252

return false;

239

253

}

240

254

/* Special case of first server */

242

256

new_server->next = new_server;

243

257

new_server->prev = new_server;

244

258

*current_server = new_server;

245

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

246

259

} else {

260

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

247

261

new_server->next = *current_server;

248

262

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

249

263

new_server->prev->next = new_server;

255

269

/*

256

270

* Initialize GPGME.

257

271

*/

258

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

259

const char *tempdir, mandos_context *mc){

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){

260

277

gpgme_error_t rc;

261

278

gpgme_engine_info_t engine_info;

262

279

263

280

/*

264

281

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

265

282

*/

266

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

267

284

int ret;

268

285

int fd;

269

286

gpgme_data_t pgp_data;

350

367

* Decrypt OpenPGP data.

351

368

* Returns -1 on error

352

369

*/

370

__attribute__((nonnull, warn_unused_result))

353

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

372

size_t crypto_size,

355

373

char **plaintext,

475

493

return plaintext_length;

476

494

}

477

495

478

static const char * safer_gnutls_strerror(int value){

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){

479

505

const char *ret = gnutls_strerror(value);

480

if(ret == NULL)

481

ret = "(unknown)";

482

return ret;

506

return safe_string(ret);

483

507

}

484

508

485

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

486

511

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

487

512

const char* string){

488

513

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

489

514

}

490

515

516

__attribute__((nonnull, warn_unused_result))

491

517

static int init_gnutls_global(const char *pubkeyfilename,

492

518

const char *seckeyfilename,

493

519

mandos_context *mc){

494

520

int ret;

521

unsigned int uret;

495

522

496

523

if(debug){

497

524

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

548

575

safer_gnutls_strerror(ret));

549

576

goto globalfail;

550

577

}

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

551

679

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

552

680

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

555

683

goto globalfail;

556

684

}

557

685

567

695

return -1;

568

696

}

569

697

698

__attribute__((nonnull, warn_unused_result))

570

699

static int init_gnutls_session(gnutls_session_t *session,

571

700

mandos_context *mc){

572

701

int ret;

629

758

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

630

759

631

760

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

632

762

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

633

763

AvahiIfIndex if_index,

634

764

int af, mandos_context *mc){

635

765

int ret, tcp_sd = -1;

636

766

ssize_t sret;

637

union {

638

struct sockaddr_in in;

639

struct sockaddr_in6 in6;

640

} to;

767

struct sockaddr_storage to;

641

768

char *buffer = NULL;

642

769

char *decrypted_buffer = NULL;

643

770

size_t buffer_length = 0;

724

851

725

852

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

726

853

if(af == AF_INET6){

727

to.in6.sin6_family = (sa_family_t)af;

728

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

854

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

855

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

729

856

} else { /* IPv4 */

730

to.in.sin_family = (sa_family_t)af;

731

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

857

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

858

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

732

859

}

733

860

if(ret < 0 ){

734

861

int e = errno;

743

870

goto mandos_end;

744

871

}

745

872

if(af == AF_INET6){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

756

876

if(if_index == AVAHI_IF_UNSPEC){

757

877

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

758

878

" incomplete without a network interface\n");

760

880

goto mandos_end;

761

881

}

762

882

/* Set the network interface number as scope */

763

to.in6.sin6_scope_id = (uint32_t)if_index;

883

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

764

884

}

765

885

} else {

766

to.in.sin_port = htons(port);

886

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

767

887

}

768

888

769

889

if(quit_now){

787

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

788

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

789

909

if(af == AF_INET6){

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

910

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

911

sizeof(struct sockaddr_in6),

791

912

addrstr, sizeof(addrstr), NULL, 0,

792

913

NI_NUMERICHOST);

793

914

} else {

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

915

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

916

sizeof(struct sockaddr_in),

795

917

addrstr, sizeof(addrstr), NULL, 0,

796

918

NI_NUMERICHOST);

797

919

}

810

932

}

811

933

812

934

if(af == AF_INET6){

813

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

935

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

936

sizeof(struct sockaddr_in6));

814

937

} else {

815

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

938

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

939

sizeof(struct sockaddr_in));

816

940

}

817

941

if(ret < 0){

818

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

942

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

819

943

int e = errno;

820

944

perror_plus("connect");

821

945

errno = e;

1036

1160

return retval;

1037

1161

}

1038

1162

1163

__attribute__((nonnull))

1039

1164

static void resolve_callback(AvahiSServiceResolver *r,

1040

1165

AvahiIfIndex interface,

1041

1166

AvahiProtocol proto,

1049

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

1050

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1051

1176

flags,

1052

void* mc){

1177

void *mc){

1053

1178

if(r == NULL){

1054

1179

return;

1055

1180

}

1058

1183

timed out */

1059

1184

1060

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1061

1187

return;

1062

1188

}

1063

1189

1108

1234

const char *domain,

1109

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1110

1236

flags,

1111

void* mc){

1237

void *mc){

1112

1238

if(b == NULL){

1113

1239

return;

1114

1240

}

1174

1300

errno = old_errno;

1175

1301

}

1176

1302

1303

__attribute__((nonnull, warn_unused_result))

1177

1304

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

1178

1305

int ret;

1179

1306

error_t ret_errno;

1198

1325

return true;

1199

1326

}

1200

1327

1328

__attribute__((nonnull, warn_unused_result))

1201

1329

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

1202

1330

1203

1331

/* Reject the loopback device */

1245

1373

* corresponds to an acceptable network device.

1246

1374

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

1247

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1248

1377

int good_interface(const struct dirent *if_entry){

1249

1378

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

1250

1379

return 0;

1268

1397

/*

1269

1398

* This function determines if a network interface is up.

1270

1399

*/

1400

__attribute__((nonnull, warn_unused_result))

1271

1401

bool interface_is_up(const char *interface){

1272

1402

struct ifreq ifr;

1273

1403

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

1284

1414

/*

1285

1415

* This function determines if a network interface is running

1286

1416

*/

1417

__attribute__((nonnull, warn_unused_result))

1287

1418

bool interface_is_running(const char *interface){

1288

1419

struct ifreq ifr;

1289

1420

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

1297

1428

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

1298

1429

}

1299

1430

1431

__attribute__((nonnull, pure, warn_unused_result))

1300

1432

int notdotentries(const struct dirent *direntry){

1301

1433

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

1302

1434

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

1309

1441

}

1310

1442

1311

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1312

1445

int runnable_hook(const struct dirent *direntry){

1313

1446

int ret;

1314

1447

size_t sret;

1322

1455

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

1323

1456

"abcdefghijklmnopqrstuvwxyz"

1324

1457

"0123456789"

1325

"_-");

1458

"_.-");

1326

1459

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

1327

1460

/* Contains non-allowed characters */

1328

1461

if(debug){

1332

1465

return 0;

1333

1466

}

1334

1467

1335

char *fullname = NULL;

1336

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

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1468

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

1343

1469

if(ret == -1){

1344

1470

if(debug){

1345

1471

perror_plus("Could not stat hook");

1369

1495

return 1;

1370

1496

}

1371

1497

1498

__attribute__((nonnull, warn_unused_result))

1372

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

1500

mandos_context *mc){

1374

1501

int ret;

1378

1505

1379

1506

while(true){

1380

1507

if(mc->current_server == NULL){

1381

if (debug){

1508

if(debug){

1382

1509

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

1383

1510

" No timeout!\n");

1384

1511

}

1385

1512

ret = avahi_simple_poll_iterate(s, -1);

1386

1513

} else {

1387

if (debug){

1514

if(debug){

1388

1515

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

1389

1516

" it, or wait\n");

1390

1517

}

1407

1534

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

1408

1535

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

1409

1536

1410

if (debug){

1537

if(debug){

1411

1538

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

1412

1539

block_time);

1413

1540

}

1435

1562

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

1436

1563

}

1437

1564

if(ret != 0){

1438

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

1565

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

1439

1566

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

1440

1567

}

1441

1568

}

1443

1570

}

1444

1571

1445

1572

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

1573

__attribute__((warn_unused_result))

1446

1574

error_t raise_privileges(void){

1447

1575

error_t old_errno = errno;

1448

1576

error_t ret_errno = 0;

1449

1577

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

1450

1578

ret_errno = errno;

1451

perror_plus("seteuid");

1452

1579

}

1453

1580

errno = old_errno;

1454

1581

return ret_errno;

1455

1582

}

1456

1583

1457

1584

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

1585

__attribute__((warn_unused_result))

1458

1586

error_t raise_privileges_permanently(void){

1459

1587

error_t old_errno = errno;

1460

1588

error_t ret_errno = raise_privileges();

1464

1592

}

1465

1593

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

1466

1594

ret_errno = errno;

1467

perror_plus("seteuid");

1468

1595

}

1469

1596

errno = old_errno;

1470

1597

return ret_errno;

1471

1598

}

1472

1599

1473

1600

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

1601

__attribute__((warn_unused_result))

1474

1602

error_t lower_privileges(void){

1475

1603

error_t old_errno = errno;

1476

1604

error_t ret_errno = 0;

1477

1605

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

1478

1606

ret_errno = errno;

1479

perror_plus("seteuid");

1480

1607

}

1481

1608

errno = old_errno;

1482

1609

return ret_errno;

1483

1610

}

1484

1611

1485

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1486

1614

error_t lower_privileges_permanently(void){

1487

1615

error_t old_errno = errno;

1488

1616

error_t ret_errno = 0;

1489

1617

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

1490

1618

ret_errno = errno;

1491

perror_plus("setuid");

1492

1619

}

1493

1620

errno = old_errno;

1494

1621

return ret_errno;

1495

1622

}

1496

1623

1497

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

1624

__attribute__((nonnull))

1625

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

1498

1626

const float delay){

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

#else /* not __GLIBC_PREREQ(2, 15) */

1647

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

1648

alphasort);

1649

#endif /* not __GLIBC_PREREQ(2, 15) */

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1502

1654

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1655

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1510

1666

}

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

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

1519

if(ret < 0){

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1520

1728

perror_plus("asprintf");

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1579

1733

free(delaystring);

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

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

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1591

1785

} else {

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1628

1805

}

1629

1806

1807

__attribute__((nonnull, warn_unused_result))

1630

1808

error_t bring_up_interface(const char *const interface,

1631

1809

const float delay){

1632

int sd = -1;

1633

1810

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1811

int ret;

1636

1812

struct ifreq network;

1637

1813

unsigned int if_index = if_nametoindex(interface);

1638

1814

if(if_index == 0){

1647

1823

}

1648

1824

1649

1825

if(not interface_is_up(interface)){

1650

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

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1651

1828

ret_errno = errno;

1652

1829

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

1653

1830

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

1831

errno = old_errno;

1654

1832

return ret_errno;

1655

1833

}

1656

network.ifr_flags |= IFF_UP;

1834

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

1657

1835

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1836

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

1837

if(sd == -1){

1660

1838

ret_errno = errno;

1661

1839

perror_plus("socket");

1662

1840

errno = old_errno;

1663

1841

return ret_errno;

1664

1842

}

1665

1843

1666

1844

if(quit_now){

1667

close(sd);

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1668

1849

errno = old_errno;

1669

1850

return EINTR;

1670

1851

}

1674

1855

interface);

1675

1856

}

1676

1857

1677

/* Raise priviliges */

1678

raise_privileges();

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1679

1864

1680

1865

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

int ret_linux = klogctl(8, NULL, 5);

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1688

1877

}

1689

1878

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1879

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

1880

ioctl_errno = errno;

1692

1881

#ifdef __linux__

1693

1882

if(restore_loglevel){

1694

1883

ret_linux = klogctl(7, NULL, 0);

1698

1887

}

1699

1888

#endif /* __linux__ */

1700

1889

1701

/* Lower privileges */

1702

lower_privileges();

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1703

1899

1704

1900

/* Close the socket */

1705

1901

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

1708

1904

}

1709

1905

1710

1906

if(ret_setflags == -1){

1711

errno = ret_errno;

1907

errno = ioctl_errno;

1712

1908

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

1909

errno = old_errno;

1714

return ret_errno;

1910

return ioctl_errno;

1715

1911

}

1716

1912

} else if(debug){

1717

1913

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

1735

1931

return 0;

1736

1932

}

1737

1933

1934

__attribute__((nonnull, warn_unused_result))

1738

1935

error_t take_down_interface(const char *const interface){

1739

1936

error_t old_errno = errno;

1740

1937

struct ifreq network;

1745

1942

return ENXIO;

1746

1943

}

1747

1944

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1945

error_t ret_errno = 0, ioctl_errno = 0;

1749

1946

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

1750

1947

ret_errno = errno;

1751

1948

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

1752

1949

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

1950

errno = old_errno;

1753

1951

return ret_errno;

1754

1952

}

1755

1953

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

1756

1954

1757

1955

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

1758

if(sd < 0){

1956

if(sd == -1){

1759

1957

ret_errno = errno;

1760

1958

perror_plus("socket");

1761

1959

errno = old_errno;

1767

1965

interface);

1768

1966

}

1769

1967

1770

/* Raise priviliges */

1771

raise_privileges();

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1772

1974

1773

1975

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

1774

ret_errno = errno;

1976

ioctl_errno = errno;

1775

1977

1776

/* Lower privileges */

1777

lower_privileges();

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1778

1987

1779

1988

/* Close the socket */

1780

1989

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

1783

1992

}

1784

1993

1785

1994

if(ret_setflags == -1){

1786

errno = ret_errno;

1995

errno = ioctl_errno;

1787

1996

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

1997

errno = old_errno;

1789

return ret_errno;

1998

return ioctl_errno;

1790

1999

}

1791

2000

} else if(debug){

1792

2001

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

1798

2007

}

1799

2008

1800

2009

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

1801

mandos_context mc = { .server = NULL, .dh_bits = 1024,

2010

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

1802

2011

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

1803

"+CTYPE-OPENPGP", .current_server = NULL,

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1804

2013

.interfaces = NULL, .interfaces_size = 0 };

1805

2014

AvahiSServiceBrowser *sb = NULL;

1806

2015

error_t ret_errno;

1810

2019

int exitcode = EXIT_SUCCESS;

1811

2020

char *interfaces_to_take_down = NULL;

1812

2021

size_t interfaces_to_take_down_size = 0;

1813

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

1814

bool tempdir_created = false;

2022

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

2023

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

2024

char *tempdir = NULL;

1815

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1816

2026

const char *seckey = PATHDIR "/" SECKEY;

1817

2027

const char *pubkey = PATHDIR "/" PUBKEY;

1999

2209

/* Work around Debian bug #633582:

2000

2210

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

2001

2211

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

2004

2218

struct stat st;

2005

2219

2006

2220

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

2046

2260

}

2047

2261

2048

2262

/* Lower privileges */

2049

lower_privileges();

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2050

2268

}

2051

2269

}

2052

2270

2078

2296

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

2079

2297

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

2080

2298

}

2081

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2085

2301

}

2086

2302

2087

2303

if(not debug){

2165

2381

2166

2382

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

2167

2383

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2384

struct dirent **direntries = NULL;

2169

2385

/* Look for any good interfaces */

2170

2386

ret = scandir(sys_class_net, &direntries, good_interface,

2171

2387

alphasort);

2177

2393

if(ret_errno != 0){

2178

2394

errno = ret_errno;

2179

2395

perror_plus("argz_add");

2396

free(direntries[i]);

2180

2397

continue;

2181

2398

}

2182

2399

if(debug){

2183

2400

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

2184

2401

direntries[i]->d_name);

2185

2402

}

2403

free(direntries[i]);

2186

2404

}

2187

2405

free(direntries);

2188

2406

} else {

2189

free(direntries);

2407

if(ret == 0){

2408

free(direntries);

2409

}

2190

2410

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

2191

2411

exitcode = EXIT_FAILURE;

2192

2412

goto end;

2215

2435

break;

2216

2436

}

2217

2437

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2438

errno = bring_up_interface(interface, delay);

2219

2439

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2440

if(errno != 0){

2222

2441

perror_plus("Failed to bring up interface");

2223

2442

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2229

2447

perror_plus("argz_add");

2230

2448

}

2231

2449

}

2262

2480

goto end;

2263

2481

}

2264

2482

2265

if(mkdtemp(tempdir) == NULL){

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2266

2493

perror_plus("mkdtemp");

2267

2494

goto end;

2268

2495

}

2269

tempdir_created = true;

2270

2496

2271

2497

if(quit_now){

2272

2498

goto end;

2347

2573

sleep((unsigned int)retry_interval);

2348

2574

}

2349

2575

2350

if (not quit_now){

2576

if(not quit_now){

2351

2577

exitcode = EXIT_SUCCESS;

2352

2578

}

2353

2579

2408

2634

if(debug){

2409

2635

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

2410

2636

}

2411

2637

2412

2638

ret = avahi_loop_with_timeout(simple_poll,

2413

2639

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

2414

2640

if(debug){

2450

2676

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

2451

2677

while(mc.current_server != NULL){

2452

2678

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

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

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2453

2687

free(mc.current_server);

2454

2688

mc.current_server = next;

2455

2689

}

2456

2690

}

2457

2691

2458

/* Re-raise priviliges */

2692

/* Re-raise privileges */

2459

2693

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2476

}

2477

}

2478

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

2479

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

2480

" down\n");

2481

}

2482

}

2483

2484

lower_privileges_permanently();

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2485

2728

}

2486

2729

2487

2730

free(interfaces_to_take_down);

2488

2731

free(interfaces_hooks);

2489

2732

2490

2733

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

2491

if(tempdir_created){

2734

if(tempdir != NULL){

2492

2735

struct dirent **direntries = NULL;

2493

struct dirent *direntry = NULL;

2494

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

2495

alphasort);

2496

if (numentries > 0){

2497

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

2498

direntry = direntries[i];

2499

char *fullname = NULL;

2500

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

2501

direntry->d_name);

2502

if(ret < 0){

2503

perror_plus("asprintf");

2504

continue;

2505

}

2506

ret = remove(fullname);

2507

if(ret == -1){

2508

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

2509

strerror(errno));

2510

}

2511

free(fullname);

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

#else /* not __GLIBC_PREREQ(2, 15) */

2746

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

2747

alphasort);

2748

#endif /* not __GLIBC_PREREQ(2, 15) */

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2512

2773

}

2513

}

2514

2515

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

2516

free(direntries);

2517

if (numentries == -1){

2518

perror_plus("scandir");

2519

}

2520

ret = rmdir(tempdir);

2521

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

2522

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2523

2775

}

2524

2776

}

2525

2777