/mandos/trunk : revision 669

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

141

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

142

char *connect_to = NULL;

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

144

uid_t uid = 65534;

146

145

gid_t gid = 65534;

147

146

184

183

perror(print_text);

185

184

}

186

185

187

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

186

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

188

187

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

189

188

va_list ap;

190

189

va_start (ap, format);

199

198

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

200

199

* "buffer_length" is how much is already used.

201

200

*/

202

__attribute__((nonnull, warn_unused_result))

203

201

size_t incbuffer(char **buffer, size_t buffer_length,

204

202

size_t buffer_capacity){

205

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

218

216

}

219

217

220

218

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

221

__attribute__((nonnull, warn_unused_result))

222

219

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

223

220

int af, server **current_server){

224

221

int ret;

245

242

new_server->next = new_server;

246

243

new_server->prev = new_server;

247

244

*current_server = new_server;

245

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

248

246

} else {

249

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

250

247

new_server->next = *current_server;

251

248

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

252

249

new_server->prev->next = new_server;

258

255

/*

259

256

* Initialize GPGME.

260

257

*/

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

258

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

259

const char *tempdir, mandos_context *mc){

266

260

gpgme_error_t rc;

267

261

gpgme_engine_info_t engine_info;

268

262

269

263

/*

270

264

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

271

265

*/

272

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

273

267

int ret;

274

268

int fd;

275

269

gpgme_data_t pgp_data;

356

350

* Decrypt OpenPGP data.

357

351

* Returns -1 on error

358

352

*/

359

__attribute__((nonnull, warn_unused_result))

360

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

361

354

size_t crypto_size,

362

355

char **plaintext,

482

475

return plaintext_length;

483

476

}

484

477

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

487

479

const char *ret = gnutls_strerror(value);

488

480

if(ret == NULL)

489

481

ret = "(unknown)";

491

483

}

492

484

493

485

/* GnuTLS log function callback */

494

__attribute__((nonnull))

495

486

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

496

487

const char* string){

497

488

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

498

489

}

499

490

500

__attribute__((nonnull, warn_unused_result))

501

491

static int init_gnutls_global(const char *pubkeyfilename,

502

492

const char *seckeyfilename,

503

493

mandos_context *mc){

577

567

return -1;

578

568

}

579

569

580

__attribute__((nonnull, warn_unused_result))

581

570

static int init_gnutls_session(gnutls_session_t *session,

582

571

mandos_context *mc){

583

572

int ret;

640

629

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

641

630

642

631

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

644

632

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

645

633

AvahiIfIndex if_index,

646

634

int af, mandos_context *mc){

752

740

goto mandos_end;

753

741

}

754

742

if(af == AF_INET6){

755

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

743

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

756

744

if(IN6_IS_ADDR_LINKLOCAL

757

745

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

758

746

if(if_index == AVAHI_IF_UNSPEC){

821

809

sizeof(struct sockaddr_in));

822

810

}

823

811

if(ret < 0){

824

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

812

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

825

813

int e = errno;

826

814

perror_plus("connect");

827

815

errno = e;

1042

1030

return retval;

1043

1031

}

1044

1032

1045

__attribute__((nonnull))

1046

1033

static void resolve_callback(AvahiSServiceResolver *r,

1047

1034

AvahiIfIndex interface,

1048

1035

AvahiProtocol proto,

1056

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1057

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1045

flags,

1059

void *mc){

1046

void* mc){

1060

1047

if(r == NULL){

1061

1048

return;

1062

1049

}

1115

1102

const char *domain,

1116

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1117

1104

flags,

1118

void *mc){

1105

void* mc){

1119

1106

if(b == NULL){

1120

1107

return;

1121

1108

}

1181

1168

errno = old_errno;

1182

1169

}

1183

1170

1184

__attribute__((nonnull, warn_unused_result))

1185

1171

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

1186

1172

int ret;

1187

1173

error_t ret_errno;

1206

1192

return true;

1207

1193

}

1208

1194

1209

__attribute__((nonnull, warn_unused_result))

1210

1195

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

1211

1196

1212

1197

/* Reject the loopback device */

1254

1239

* corresponds to an acceptable network device.

1255

1240

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

1256

1241

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

1242

int good_interface(const struct dirent *if_entry){

1259

1243

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

1260

1244

return 0;

1278

1262

/*

1279

1263

* This function determines if a network interface is up.

1280

1264

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

1265

bool interface_is_up(const char *interface){

1283

1266

struct ifreq ifr;

1284

1267

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

1295

1278

/*

1296

1279

* This function determines if a network interface is running

1297

1280

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

1281

bool interface_is_running(const char *interface){

1300

1282

struct ifreq ifr;

1301

1283

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

1309

1291

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

1310

1292

}

1311

1293

1312

__attribute__((nonnull, pure, warn_unused_result))

1313

1294

int notdotentries(const struct dirent *direntry){

1314

1295

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

1315

1296

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

1322

1303

}

1323

1304

1324

1305

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

1325

__attribute__((nonnull, warn_unused_result))

1326

1306

int runnable_hook(const struct dirent *direntry){

1327

1307

int ret;

1328

1308

size_t sret;

1336

1316

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

1337

1317

"abcdefghijklmnopqrstuvwxyz"

1338

1318

"0123456789"

1339

"_.-");

1319

"_-");

1340

1320

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

1341

1321

/* Contains non-allowed characters */

1342

1322

if(debug){

1360

1340

}

1361

1341

return 0;

1362

1342

}

1363

free(fullname);

1364

1343

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

1365

1344

/* Not a regular file */

1366

1345

if(debug){

1384

1363

return 1;

1385

1364

}

1386

1365

1387

__attribute__((nonnull, warn_unused_result))

1388

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

1367

mandos_context *mc){

1390

1368

int ret;

1394

1372

1395

1373

while(true){

1396

1374

if(mc->current_server == NULL){

1397

if(debug){

1375

if (debug){

1398

1376

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

1399

1377

" No timeout!\n");

1400

1378

}

1401

1379

ret = avahi_simple_poll_iterate(s, -1);

1402

1380

} else {

1403

if(debug){

1381

if (debug){

1404

1382

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

1405

1383

" it, or wait\n");

1406

1384

}

1423

1401

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

1424

1402

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

1425

1403

1426

if(debug){

1404

if (debug){

1427

1405

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

1428

1406

block_time);

1429

1407

}

1451

1429

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

1452

1430

}

1453

1431

if(ret != 0){

1454

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

1432

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

1455

1433

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

1456

1434

}

1457

1435

}

1459

1437

}

1460

1438

1461

1439

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

1462

__attribute__((warn_unused_result))

1463

1440

error_t raise_privileges(void){

1464

1441

error_t old_errno = errno;

1465

1442

error_t ret_errno = 0;

1472

1449

}

1473

1450

1474

1451

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

1475

__attribute__((warn_unused_result))

1476

1452

error_t raise_privileges_permanently(void){

1477

1453

error_t old_errno = errno;

1478

1454

error_t ret_errno = raise_privileges();

1489

1465

}

1490

1466

1491

1467

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

1492

__attribute__((warn_unused_result))

1493

1468

error_t lower_privileges(void){

1494

1469

error_t old_errno = errno;

1495

1470

error_t ret_errno = 0;

1502

1477

}

1503

1478

1504

1479

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

1480

error_t lower_privileges_permanently(void){

1507

1481

error_t old_errno = errno;

1508

1482

error_t ret_errno = 0;

1514

1488

return ret_errno;

1515

1489

}

1516

1490

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

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

1491

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

1538

1492

const float delay){

1539

1493

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

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

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

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

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

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

1574

runnable_hook, alphasort);

1575

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

1576

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

1577

alphasort);

1578

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

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1494

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

1495

alphasort);

1583

1496

if(numhooks == -1){

1584

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

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

1590

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

1591

direntry = direntries[i];

1592

if(debug){

1593

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

1594

direntry->d_name);

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1595

1504

}

1596

pid_t hook_pid = fork();

1597

if(hook_pid == 0){

1598

/* Child */

1599

/* Raise privileges */

1600

if(raise_privileges_permanently() != 0){

1601

perror_plus("Failed to raise privileges");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Set group */

1605

errno = 0;

1606

ret = setgid(0);

1607

if(ret == -1){

1608

perror_plus("setgid");

1609

_exit(EX_NOPERM);

1610

}

1611

/* Reset supplementary groups */

1612

errno = 0;

1613

ret = setgroups(0, NULL);

1614

if(ret == -1){

1615

perror_plus("setgroups");

1616

_exit(EX_NOPERM);

1617

}

1618

ret = dup2(devnull, STDIN_FILENO);

1619

if(ret == -1){

1620

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

1621

_exit(EX_OSERR);

1622

}

1623

ret = close(devnull);

1624

if(ret == -1){

1625

perror_plus("close");

1626

_exit(EX_OSERR);

1627

}

1628

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1629

if(ret == -1){

1630

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

1631

_exit(EX_OSERR);

1632

}

1633

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

1634

if(ret == -1){

1635

perror_plus("setenv");

1636

_exit(EX_OSERR);

1637

}

1638

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

1639

if(ret == -1){

1640

perror_plus("setenv");

1641

_exit(EX_OSERR);

1642

}

1643

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

1644

if(ret == -1){

1645

perror_plus("setenv");

1646

_exit(EX_OSERR);

1647

}

1648

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

1649

if(ret == -1){

1650

perror_plus("setenv");

1651

_exit(EX_OSERR);

1652

}

1653

char *delaystring;

1654

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

1655

if(ret == -1){

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

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

1509

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

1510

direntry = direntries[i];

1511

char *fullname = NULL;

1512

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

1513

if(ret < 0){

1656

1514

perror_plus("asprintf");

1657

_exit(EX_OSERR);

1658

}

1659

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

1660

if(ret == -1){

1515

continue;

1516

}

1517

if(debug){

1518

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

1519

direntry->d_name);

1520

}

1521

pid_t hook_pid = fork();

1522

if(hook_pid == 0){

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

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

1552

if(ret == -1){

1553

perror_plus("setenv");

1554

_exit(EX_OSERR);

1555

}

1556

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

1557

if(ret == -1){

1558

perror_plus("setenv");

1559

_exit(EX_OSERR);

1560

}

1561

char *delaystring;

1562

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

1563

if(ret == -1){

1564

perror_plus("asprintf");

1565

_exit(EX_OSERR);

1566

}

1567

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

1568

if(ret == -1){

1569

free(delaystring);

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1661

1573

free(delaystring);

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

free(delaystring);

1666

if(connect_to != NULL){

1667

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

1668

if(ret == -1){

1669

perror_plus("setenv");

1670

_exit(EX_OSERR);

1671

}

1672

}

1673

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

1674

{ direntry->d_name, NULL }, environ) == -1){

1675

perror_plus("fexecve");

1676

_exit(EXIT_FAILURE);

1677

}

1678

} else {

1679

int status;

1680

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

1681

perror_plus("waitpid");

1682

continue;

1683

}

1684

if(WIFEXITED(status)){

1685

if(WEXITSTATUS(status) != 0){

1686

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

1687

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

1688

WEXITSTATUS(status));

1689

continue;

1690

}

1691

} else if(WIFSIGNALED(status)){

1692

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

1693

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

1694

WTERMSIG(status));

1695

continue;

1574

if(connect_to != NULL){

1575

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

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

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

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

1696

1585

} else {

1697

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

1698

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

1699

continue;

1700

}

1701

}

1702

if(debug){

1703

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

1704

direntry->d_name);

1705

}

1706

}

1707

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

1708

perror_plus("close");

1709

} else {

1710

hookdir_fd = -1;

1711

}

1712

close(devnull);

1586

int status;

1587

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

1588

perror_plus("waitpid");

1589

free(fullname);

1590

continue;

1591

}

1592

if(WIFEXITED(status)){

1593

if(WEXITSTATUS(status) != 0){

1594

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

1595

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

1596

WEXITSTATUS(status));

1597

free(fullname);

1598

continue;

1599

}

1600

} else if(WIFSIGNALED(status)){

1601

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

1602

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

1603

WTERMSIG(status));

1604

free(fullname);

1605

continue;

1606

} else {

1607

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

1608

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

1609

free(fullname);

1610

continue;

1611

}

1612

}

1613

free(fullname);

1614

if(debug){

1615

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

1616

direntry->d_name);

1617

}

1618

}

1619

close(devnull);

1620

}

1621

return true;

1713

1622

}

1714

1623

1715

__attribute__((nonnull, warn_unused_result))

1716

1624

error_t bring_up_interface(const char *const interface,

1717

1625

const float delay){

1626

int sd = -1;

1718

1627

error_t old_errno = errno;

1719

int ret;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1720

1630

struct ifreq network;

1721

1631

unsigned int if_index = if_nametoindex(interface);

1722

1632

if(if_index == 0){

1731

1641

}

1732

1642

1733

1643

if(not interface_is_up(interface)){

1734

error_t ret_errno = 0, ioctl_errno = 0;

1735

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

1644

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

1736

1645

ret_errno = errno;

1737

1646

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

1738

1647

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

1739

errno = old_errno;

1740

1648

return ret_errno;

1741

1649

}

1742

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

1650

network.ifr_flags |= IFF_UP;

1743

1651

1744

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

1745

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1746

1654

ret_errno = errno;

1747

1655

perror_plus("socket");

1748

1656

errno = old_errno;

1749

1657

return ret_errno;

1750

1658

}

1751

1659

1752

1660

if(quit_now){

1753

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

1754

if(ret == -1){

1755

perror_plus("close");

1756

}

1661

close(sd);

1757

1662

errno = old_errno;

1758

1663

return EINTR;

1759

1664

}

1763

1668

interface);

1764

1669

}

1765

1670

1766

/* Raise privileges */

1767

ret_errno = raise_privileges();

1768

if(ret_errno != 0){

1769

perror_plus("Failed to raise privileges");

1770

}

1671

/* Raise priviliges */

1672

raise_privileges();

1771

1673

1772

1674

#ifdef __linux__

1773

int ret_linux;

1774

bool restore_loglevel = false;

1775

if(ret_errno == 0){

1776

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1777

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

1778

ret_linux = klogctl(8, NULL, 5);

1779

if(ret_linux == -1){

1780

perror_plus("klogctl");

1781

} else {

1782

restore_loglevel = true;

1783

}

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1784

1682

}

1785

1683

#endif /* __linux__ */

1786

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

1787

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

1788

1686

#ifdef __linux__

1789

1687

if(restore_loglevel){

1790

1688

ret_linux = klogctl(7, NULL, 0);

1794

1692

}

1795

1693

#endif /* __linux__ */

1796

1694

1797

/* If raise_privileges() succeeded above */

1798

if(ret_errno == 0){

1799

/* Lower privileges */

1800

ret_errno = lower_privileges();

1801

if(ret_errno != 0){

1802

errno = ret_errno;

1803

perror_plus("Failed to lower privileges");

1804

}

1805

}

1695

/* Lower privileges */

1696

lower_privileges();

1806

1697

1807

1698

/* Close the socket */

1808

1699

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

1811

1702

}

1812

1703

1813

1704

if(ret_setflags == -1){

1814

errno = ioctl_errno;

1705

errno = ret_errno;

1815

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1816

1707

errno = old_errno;

1817

return ioctl_errno;

1708

return ret_errno;

1818

1709

}

1819

1710

} else if(debug){

1820

1711

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

1838

1729

return 0;

1839

1730

}

1840

1731

1841

__attribute__((nonnull, warn_unused_result))

1842

1732

error_t take_down_interface(const char *const interface){

1843

1733

error_t old_errno = errno;

1844

1734

struct ifreq network;

1849

1739

return ENXIO;

1850

1740

}

1851

1741

if(interface_is_up(interface)){

1852

error_t ret_errno = 0, ioctl_errno = 0;

1742

error_t ret_errno = 0;

1853

1743

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

1854

1744

ret_errno = errno;

1855

1745

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

1856

1746

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

1857

errno = old_errno;

1858

1747

return ret_errno;

1859

1748

}

1860

1749

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

1861

1750

1862

1751

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

1863

if(sd == -1){

1752

if(sd < 0){

1864

1753

ret_errno = errno;

1865

1754

perror_plus("socket");

1866

1755

errno = old_errno;

1872

1761

interface);

1873

1762

}

1874

1763

1875

/* Raise privileges */

1876

ret_errno = raise_privileges();

1877

if(ret_errno != 0){

1878

perror_plus("Failed to raise privileges");

1879

}

1764

/* Raise priviliges */

1765

raise_privileges();

1880

1766

1881

1767

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

1882

ioctl_errno = errno;

1768

ret_errno = errno;

1883

1769

1884

/* If raise_privileges() succeeded above */

1885

if(ret_errno == 0){

1886

/* Lower privileges */

1887

ret_errno = lower_privileges();

1888

if(ret_errno != 0){

1889

errno = ret_errno;

1890

perror_plus("Failed to lower privileges");

1891

}

1892

}

1770

/* Lower privileges */

1771

lower_privileges();

1893

1772

1894

1773

/* Close the socket */

1895

1774

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

1898

1777

}

1899

1778

1900

1779

if(ret_setflags == -1){

1901

errno = ioctl_errno;

1780

errno = ret_errno;

1902

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1903

1782

errno = old_errno;

1904

return ioctl_errno;

1783

return ret_errno;

1905

1784

}

1906

1785

} else if(debug){

1907

1786

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

1915

1794

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

1916

1795

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

1917

1796

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

1918

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

1797

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

1919

1798

.interfaces = NULL, .interfaces_size = 0 };

1920

1799

AvahiSServiceBrowser *sb = NULL;

1921

1800

error_t ret_errno;

1925

1804

int exitcode = EXIT_SUCCESS;

1926

1805

char *interfaces_to_take_down = NULL;

1927

1806

size_t interfaces_to_take_down_size = 0;

1928

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

1929

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

1930

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

1931

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1932

1810

const char *seckey = PATHDIR "/" SECKEY;

1933

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2115

1993

/* Work around Debian bug #633582:

2116

1994

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

2117

1995

2118

/* Re-raise privileges */

2119

ret_errno = raise_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to raise privileges");

2123

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2124

1998

struct stat st;

2125

1999

2126

2000

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

2166

2040

}

2167

2041

2168

2042

/* Lower privileges */

2169

ret_errno = lower_privileges();

2170

if(ret_errno != 0){

2171

errno = ret_errno;

2172

perror_plus("Failed to lower privileges");

2173

}

2043

lower_privileges();

2174

2044

}

2175

2045

}

2176

2046

2202

2072

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

2203

2073

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

2204

2074

}

2205

run_network_hooks("start", interfaces_hooks != NULL ?

2206

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2207

2079

}

2208

2080

2209

2081

if(not debug){

2337

2209

break;

2338

2210

}

2339

2211

bool interface_was_up = interface_is_up(interface);

2340

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2341

2213

if(not interface_was_up){

2342

if(errno != 0){

2214

if(ret != 0){

2215

errno = ret;

2343

2216

perror_plus("Failed to bring up interface");

2344

2217

} else {

2345

errno = argz_add(&interfaces_to_take_down,

2346

&interfaces_to_take_down_size,

2347

interface);

2348

if(errno != 0){

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2349

2223

perror_plus("argz_add");

2350

2224

}

2351

2225

}

2382

2256

goto end;

2383

2257

}

2384

2258

2385

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

2386

tempdir = mkdtemp(run_tempdir);

2387

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

2388

if(debug){

2389

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

2390

run_tempdir, old_tempdir);

2391

}

2392

tempdir = mkdtemp(old_tempdir);

2393

}

2394

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2395

2260

perror_plus("mkdtemp");

2396

2261

goto end;

2397

2262

}

2263

tempdir_created = true;

2398

2264

2399

2265

if(quit_now){

2400

2266

goto end;

2475

2341

sleep((unsigned int)retry_interval);

2476

2342

}

2477

2343

2478

if(not quit_now){

2344

if (not quit_now){

2479

2345

exitcode = EXIT_SUCCESS;

2480

2346

}

2481

2347

2536

2402

if(debug){

2537

2403

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

2538

2404

}

2539

2405

2540

2406

ret = avahi_loop_with_timeout(simple_poll,

2541

2407

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

2542

2408

if(debug){

2583

2449

}

2584

2450

}

2585

2451

2586

/* Re-raise privileges */

2452

/* Re-raise priviliges */

2587

2453

{

2588

ret_errno = raise_privileges();

2589

if(ret_errno != 0){

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2614

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

perror_plus("Failed to lower privileges permanently");

2619

}

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2470

}

2471

}

2472

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

2473

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

2474

" down\n");

2475

}

2476

}

2477

2478

lower_privileges_permanently();

2620

2479

}

2621

2480

2622

2481

free(interfaces_to_take_down);

2623

2482

free(interfaces_hooks);

2624

2483

2625

2484

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

2626

if(tempdir != NULL){

2485

if(tempdir_created){

2627

2486

struct dirent **direntries = NULL;

2628

2487

struct dirent *direntry = NULL;

2629

2488

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

2630

2489

alphasort);

2631

if(numentries > 0){

2490

if (numentries > 0){

2632

2491

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

2633

2492

direntry = direntries[i];

2634

2493

char *fullname = NULL;

2646

2505

free(fullname);

2647

2506

}

2648

2507

}

2649

2508

2650

2509

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

2651

2510

free(direntries);

2652

if(numentries == -1){

2511

if (numentries == -1){

2653

2512

perror_plus("scandir");

2654

2513

}

2655

2514

ret = rmdir(tempdir);