/mandos/trunk : revision 652

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

58

inet_pton(), connect() */

60

59

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

61

60

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

62

61

*/

74

73

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

75

74

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

76

75

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

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

92

91

argz_delete(), argz_append(),

93

92

argz_stringify(), argz_add(),

94

93

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

97

94

98

95

#ifdef __linux__

99

96

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

183

180

perror(print_text);

184

181

}

185

182

186

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

183

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

187

184

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

188

185

va_list ap;

189

186

va_start (ap, format);

198

195

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

199

196

* "buffer_length" is how much is already used.

200

197

*/

201

__attribute__((nonnull, warn_unused_result))

202

198

size_t incbuffer(char **buffer, size_t buffer_length,

203

199

size_t buffer_capacity){

204

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

201

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

202

if(buffer == NULL){

211

203

return 0;

212

204

}

213

*buffer = new_buf;

214

205

buffer_capacity += BUFFER_SIZE;

215

206

}

216

207

return buffer_capacity;

217

208

}

218

209

219

210

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

220

__attribute__((nonnull, warn_unused_result))

221

211

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

222

212

int af, server **current_server){

223

213

int ret;

234

224

perror_plus("strdup");

235

225

return false;

236

226

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

227

/* Special case of first server */

243

228

if(*current_server == NULL){

244

229

new_server->next = new_server;

245

230

new_server->prev = new_server;

246

231

*current_server = new_server;

232

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

247

233

} else {

248

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

249

234

new_server->next = *current_server;

250

235

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

251

236

new_server->prev->next = new_server;

252

237

(*current_server)->prev = new_server;

253

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

254

244

return true;

255

245

}

256

246

257

247

/*

258

248

* Initialize GPGME.

259

249

*/

260

__attribute__((nonnull, warn_unused_result))

261

250

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

262

251

const char *tempdir, mandos_context *mc){

263

252

gpgme_error_t rc;

353

342

* Decrypt OpenPGP data.

354

343

* Returns -1 on error

355

344

*/

356

__attribute__((nonnull, warn_unused_result))

357

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

358

346

size_t crypto_size,

359

347

char **plaintext,

479

467

return plaintext_length;

480

468

}

481

469

482

__attribute__((warn_unused_result))

483

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

484

471

const char *ret = gnutls_strerror(value);

485

472

if(ret == NULL)

486

473

ret = "(unknown)";

488

475

}

489

476

490

477

/* GnuTLS log function callback */

491

__attribute__((nonnull))

492

478

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

493

479

const char* string){

494

480

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

495

481

}

496

482

497

__attribute__((nonnull, warn_unused_result))

498

483

static int init_gnutls_global(const char *pubkeyfilename,

499

484

const char *seckeyfilename,

500

485

mandos_context *mc){

574

559

return -1;

575

560

}

576

561

577

__attribute__((nonnull, warn_unused_result))

578

562

static int init_gnutls_session(gnutls_session_t *session,

579

563

mandos_context *mc){

580

564

int ret;

637

621

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

638

622

639

623

/* Called when a Mandos server is found */

640

__attribute__((nonnull, warn_unused_result))

641

624

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

642

625

AvahiIfIndex if_index,

643

626

int af, mandos_context *mc){

644

627

int ret, tcp_sd = -1;

645

628

ssize_t sret;

646

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

647

633

char *buffer = NULL;

648

634

char *decrypted_buffer = NULL;

649

635

size_t buffer_length = 0;

730

716

731

717

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

732

718

if(af == AF_INET6){

733

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

734

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

735

721

} else { /* IPv4 */

736

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

737

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

722

to.in.sin_family = (sa_family_t)af;

723

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

738

724

}

739

725

if(ret < 0 ){

740

726

int e = errno;

749

735

goto mandos_end;

750

736

}

751

737

if(af == AF_INET6){

752

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

753

if(IN6_IS_ADDR_LINKLOCAL

754

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

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

755

748

if(if_index == AVAHI_IF_UNSPEC){

756

749

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

757

750

" incomplete without a network interface\n");

759

752

goto mandos_end;

760

753

}

761

754

/* Set the network interface number as scope */

762

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

755

to.in6.sin6_scope_id = (uint32_t)if_index;

763

756

}

764

757

} else {

765

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

758

to.in.sin_port = htons(port);

766

759

}

767

760

768

761

if(quit_now){

785

778

}

786

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

787

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

781

const char *pcret;

788

782

if(af == AF_INET6){

789

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

790

sizeof(struct sockaddr_in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

783

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

784

sizeof(addrstr));

793

785

} else {

794

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

795

sizeof(struct sockaddr_in),

796

addrstr, sizeof(addrstr), NULL, 0,

797

NI_NUMERICHOST);

786

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

787

sizeof(addrstr));

798

788

}

799

if(ret == EAI_SYSTEM){

800

perror_plus("getnameinfo");

801

} else if(ret != 0) {

802

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

803

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

804

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

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

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

793

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

794

}

805

795

}

806

796

}

807

797

811

801

}

812

802

813

803

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

804

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

816

805

} else {

817

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

818

sizeof(struct sockaddr_in));

806

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

819

807

}

820

808

if(ret < 0){

821

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

809

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

822

810

int e = errno;

823

811

perror_plus("connect");

824

812

errno = e;

1039

1027

return retval;

1040

1028

}

1041

1029

1042

__attribute__((nonnull))

1043

1030

static void resolve_callback(AvahiSServiceResolver *r,

1044

1031

AvahiIfIndex interface,

1045

1032

AvahiProtocol proto,

1053

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1054

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1042

flags,

1056

void *mc){

1043

void* mc){

1057

1044

if(r == NULL){

1058

1045

return;

1059

1046

}

1112

1099

const char *domain,

1113

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1114

1101

flags,

1115

void *mc){

1102

void* mc){

1116

1103

if(b == NULL){

1117

1104

return;

1118

1105

}

1178

1165

errno = old_errno;

1179

1166

}

1180

1167

1181

__attribute__((nonnull, warn_unused_result))

1182

1168

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

1183

1169

int ret;

1184

1170

error_t ret_errno;

1203

1189

return true;

1204

1190

}

1205

1191

1206

__attribute__((nonnull, warn_unused_result))

1207

1192

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

1208

1193

1209

1194

/* Reject the loopback device */

1251

1236

* corresponds to an acceptable network device.

1252

1237

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

1253

1238

*/

1254

__attribute__((nonnull, warn_unused_result))

1255

1239

int good_interface(const struct dirent *if_entry){

1256

1240

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

1257

1241

return 0;

1275

1259

/*

1276

1260

* This function determines if a network interface is up.

1277

1261

*/

1278

__attribute__((nonnull, warn_unused_result))

1279

1262

bool interface_is_up(const char *interface){

1280

1263

struct ifreq ifr;

1281

1264

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

1292

1275

/*

1293

1276

* This function determines if a network interface is running

1294

1277

*/

1295

__attribute__((nonnull, warn_unused_result))

1296

1278

bool interface_is_running(const char *interface){

1297

1279

struct ifreq ifr;

1298

1280

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

1306

1288

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

1307

1289

}

1308

1290

1309

__attribute__((nonnull, pure, warn_unused_result))

1310

1291

int notdotentries(const struct dirent *direntry){

1311

1292

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

1312

1293

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

1319

1300

}

1320

1301

1321

1302

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

1322

__attribute__((nonnull, warn_unused_result))

1323

1303

int runnable_hook(const struct dirent *direntry){

1324

1304

int ret;

1325

1305

size_t sret;

1380

1360

return 1;

1381

1361

}

1382

1362

1383

__attribute__((nonnull, warn_unused_result))

1384

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

1364

mandos_context *mc){

1386

1365

int ret;

1390

1369

1391

1370

while(true){

1392

1371

if(mc->current_server == NULL){

1393

if(debug){

1372

if (debug){

1394

1373

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

1395

1374

" No timeout!\n");

1396

1375

}

1397

1376

ret = avahi_simple_poll_iterate(s, -1);

1398

1377

} else {

1399

if(debug){

1378

if (debug){

1400

1379

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

1401

1380

" it, or wait\n");

1402

1381

}

1419

1398

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

1420

1399

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

1421

1400

1422

if(debug){

1401

if (debug){

1423

1402

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

1424

1403

block_time);

1425

1404

}

1447

1426

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

1448

1427

}

1449

1428

if(ret != 0){

1450

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

1429

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

1451

1430

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

1452

1431

}

1453

1432

}

1455

1434

}

1456

1435

1457

1436

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

1458

__attribute__((warn_unused_result))

1459

1437

error_t raise_privileges(void){

1460

1438

error_t old_errno = errno;

1461

1439

error_t ret_errno = 0;

1468

1446

}

1469

1447

1470

1448

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

1471

__attribute__((warn_unused_result))

1472

1449

error_t raise_privileges_permanently(void){

1473

1450

error_t old_errno = errno;

1474

1451

error_t ret_errno = raise_privileges();

1485

1462

}

1486

1463

1487

1464

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

1488

__attribute__((warn_unused_result))

1489

1465

error_t lower_privileges(void){

1490

1466

error_t old_errno = errno;

1491

1467

error_t ret_errno = 0;

1498

1474

}

1499

1475

1500

1476

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

1477

error_t lower_privileges_permanently(void){

1503

1478

error_t old_errno = errno;

1504

1479

error_t ret_errno = 0;

1510

1485

return ret_errno;

1511

1486

}

1512

1487

1513

__attribute__((nonnull))

1514

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

1488

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

1515

1489

const float delay){

1516

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1517

1493

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

1518

1494

alphasort);

1519

1495

if(numhooks == -1){

1526

1502

perror_plus("scandir");

1527

1503

}

1528

1504

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

1505

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

1532

1506

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

1533

1507

direntry = direntries[i];

1545

1519

if(hook_pid == 0){

1546

1520

/* Child */

1547

1521

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1522

raise_privileges_permanently();

1552

1523

/* Set group */

1553

1524

errno = 0;

1554

1525

ret = setgid(0);

1555

1526

if(ret == -1){

1556

1527

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

1528

}

1559

1529

/* Reset supplementary groups */

1560

1530

errno = 0;

1561

1531

ret = setgroups(0, NULL);

1562

1532

if(ret == -1){

1563

1533

perror_plus("setgroups");

1564

_exit(EX_NOPERM);

1565

}

1566

ret = dup2(devnull, STDIN_FILENO);

1567

if(ret == -1){

1568

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

1569

_exit(EX_OSERR);

1570

}

1571

ret = close(devnull);

1572

if(ret == -1){

1573

perror_plus("close");

1574

_exit(EX_OSERR);

1575

}

1576

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1577

if(ret == -1){

1578

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

1579

_exit(EX_OSERR);

1580

}

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1581

1538

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

1582

1539

if(ret == -1){

1583

1540

perror_plus("setenv");

1599

1556

_exit(EX_OSERR);

1600

1557

}

1601

1558

char *delaystring;

1602

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

1559

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

1603

1560

if(ret == -1){

1604

1561

perror_plus("asprintf");

1605

1562

_exit(EX_OSERR);

1658

1615

}

1659

1616

close(devnull);

1660

1617

}

1618

return true;

1661

1619

}

1662

1620

1663

__attribute__((nonnull, warn_unused_result))

1664

1621

error_t bring_up_interface(const char *const interface,

1665

1622

const float delay){

1623

int sd = -1;

1666

1624

error_t old_errno = errno;

1667

int ret;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1668

1627

struct ifreq network;

1669

1628

unsigned int if_index = if_nametoindex(interface);

1670

1629

if(if_index == 0){

1679

1638

}

1680

1639

1681

1640

if(not interface_is_up(interface)){

1682

error_t ret_errno = 0, ioctl_errno = 0;

1683

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

1641

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

1684

1642

ret_errno = errno;

1685

1643

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

1686

1644

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

1687

errno = old_errno;

1688

1645

return ret_errno;

1689

1646

}

1690

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

1647

network.ifr_flags |= IFF_UP;

1691

1648

1692

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

1693

if(sd == -1){

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1694

1651

ret_errno = errno;

1695

1652

perror_plus("socket");

1696

1653

errno = old_errno;

1697

1654

return ret_errno;

1698

1655

}

1699

1656

1700

1657

if(quit_now){

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1658

close(sd);

1705

1659

errno = old_errno;

1706

1660

return EINTR;

1707

1661

}

1711

1665

interface);

1712

1666

}

1713

1667

1714

/* Raise privileges */

1715

ret_errno = raise_privileges();

1716

bool restore_loglevel = false;

1717

if(ret_errno != 0){

1718

perror_plus("Failed to raise privileges");

1719

}

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1720

1671

#ifdef __linux__

1721

int ret_linux;

1722

if(ret_errno == 0){

1723

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1724

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

1725

ret_linux = klogctl(8, NULL, 5);

1726

if(ret_linux == -1){

1727

perror_plus("klogctl");

1728

} else {

1729

restore_loglevel = true;

1730

}

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1731

1679

}

1732

1680

#endif /* __linux__ */

1733

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

1734

ioctl_errno = errno;

1681

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

1682

ret_errno = errno;

1735

1683

#ifdef __linux__

1736

1684

if(restore_loglevel){

1737

1685

ret_linux = klogctl(7, NULL, 0);

1741

1689

}

1742

1690

#endif /* __linux__ */

1743

1691

1744

/* If raise_privileges() succeeded above */

1745

if(ret_errno == 0){

1746

/* Lower privileges */

1747

ret_errno = lower_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to lower privileges");

1751

}

1752

}

1692

/* Lower privileges */

1693

lower_privileges();

1753

1694

1754

1695

/* Close the socket */

1755

1696

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

1758

1699

}

1759

1700

1760

1701

if(ret_setflags == -1){

1761

errno = ioctl_errno;

1702

errno = ret_errno;

1762

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1763

1704

errno = old_errno;

1764

return ioctl_errno;

1705

return ret_errno;

1765

1706

}

1766

1707

} else if(debug){

1767

1708

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

1785

1726

return 0;

1786

1727

}

1787

1728

1788

__attribute__((nonnull, warn_unused_result))

1789

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1790

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1791

1734

struct ifreq network;

1792

1735

unsigned int if_index = if_nametoindex(interface);

1793

1736

if(if_index == 0){

1796

1739

return ENXIO;

1797

1740

}

1798

1741

if(interface_is_up(interface)){

1799

error_t ret_errno = 0, ioctl_errno = 0;

1800

1742

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

1801

1743

ret_errno = errno;

1802

1744

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

1803

1745

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

1804

errno = old_errno;

1805

1746

return ret_errno;

1806

1747

}

1807

1748

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

1808

1749

1809

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

1810

if(sd == -1){

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1811

1752

ret_errno = errno;

1812

1753

perror_plus("socket");

1813

1754

errno = old_errno;

1819

1760

interface);

1820

1761

}

1821

1762

1822

/* Raise privileges */

1823

ret_errno = raise_privileges();

1824

if(ret_errno != 0){

1825

perror_plus("Failed to raise privileges");

1826

}

1827

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

1828

ioctl_errno = errno;

1829

1830

/* If raise_privileges() succeeded above */

1831

if(ret_errno == 0){

1832

/* Lower privileges */

1833

ret_errno = lower_privileges();

1834

if(ret_errno != 0){

1835

errno = ret_errno;

1836

perror_plus("Failed to lower privileges");

1837

}

1838

}

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1839

1771

1840

1772

/* Close the socket */

1841

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

1773

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

1842

1774

if(ret == -1){

1843

1775

perror_plus("close");

1844

1776

}

1845

1777

1846

1778

if(ret_setflags == -1){

1847

errno = ioctl_errno;

1779

errno = ret_errno;

1848

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1849

1781

errno = old_errno;

1850

return ioctl_errno;

1782

return ret_errno;

1851

1783

}

1852

1784

} else if(debug){

1853

1785

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

1861

1793

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

1862

1794

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

1863

1795

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

1864

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

1796

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

1865

1797

.interfaces = NULL, .interfaces_size = 0 };

1866

1798

AvahiSServiceBrowser *sb = NULL;

1867

1799

error_t ret_errno;

1877

1809

const char *seckey = PATHDIR "/" SECKEY;

1878

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1879

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1880

1813

1881

1814

bool gnutls_initialized = false;

1882

1815

bool gpgme_initialized = false;

2060

1993

/* Work around Debian bug #633582:

2061

1994

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

2062

1995

2063

/* Re-raise privileges */

2064

ret_errno = raise_privileges();

2065

if(ret_errno != 0){

2066

errno = ret_errno;

2067

perror_plus("Failed to raise privileges");

2068

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2069

1998

struct stat st;

2070

1999

2071

2000

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

2111

2040

}

2112

2041

2113

2042

/* Lower privileges */

2114

ret_errno = lower_privileges();

2115

if(ret_errno != 0){

2116

errno = ret_errno;

2117

perror_plus("Failed to lower privileges");

2118

}

2043

lower_privileges();

2119

2044

}

2120

2045

}

2121

2046

2145

2070

goto end;

2146

2071

}

2147

2072

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

2148

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

2149

}

2150

run_network_hooks("start", interfaces_hooks != NULL ?

2151

interfaces_hooks : "", delay);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2152

2081

}

2153

2082

2154

2083

if(not debug){

2242

2171

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

2243

2172

direntries[i]->d_name);

2244

2173

if(ret_errno != 0){

2245

errno = ret_errno;

2246

2174

perror_plus("argz_add");

2247

2175

continue;

2248

2176

}

2282

2210

break;

2283

2211

}

2284

2212

bool interface_was_up = interface_is_up(interface);

2285

errno = bring_up_interface(interface, delay);

2213

ret = bring_up_interface(interface, delay);

2286

2214

if(not interface_was_up){

2287

if(errno != 0){

2215

if(ret != 0){

2216

errno = ret;

2288

2217

perror_plus("Failed to bring up interface");

2289

2218

} else {

2290

errno = argz_add(&interfaces_to_take_down,

2291

&interfaces_to_take_down_size,

2292

interface);

2293

if(errno != 0){

2294

perror_plus("argz_add");

2295

}

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2296

2222

}

2297

2223

}

2298

2224

}

2412

2338

sleep((unsigned int)retry_interval);

2413

2339

}

2414

2340

2415

if(not quit_now){

2341

if (not quit_now){

2416

2342

exitcode = EXIT_SUCCESS;

2417

2343

}

2418

2344

2520

2446

}

2521

2447

}

2522

2448

2523

/* Re-raise privileges */

2449

/* Re-raise priviliges */

2524

2450

{

2525

ret_errno = raise_privileges();

2526

if(ret_errno != 0){

2527

perror_plus("Failed to raise privileges");

2528

} else {

2529

2530

/* Run network hooks */

2531

run_network_hooks("stop", interfaces_hooks != NULL ?

2532

interfaces_hooks : "", delay);

2533

2534

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

2535

{

2536

char *interface = NULL;

2537

while((interface=argz_next(interfaces_to_take_down,

2538

interfaces_to_take_down_size,

2539

interface))){

2540

ret_errno = take_down_interface(interface);

2541

if(ret_errno != 0){

2542

errno = ret_errno;

2543

perror_plus("Failed to take down interface");

2544

}

2545

}

2546

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

2547

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

2548

" down\n");

2549

}

2550

}

2551

}

2552

ret_errno = lower_privileges_permanently();

2553

if(ret_errno != 0){

2554

perror_plus("Failed to lower privileges permanently");

2555

}

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

2556

2476

}

2557

2477

2558

2478

free(interfaces_to_take_down);

2564

2484

struct dirent *direntry = NULL;

2565

2485

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

2566

2486

alphasort);

2567

if(numentries > 0){

2487

if (numentries > 0){

2568

2488

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

2569

2489

direntry = direntries[i];

2570

2490

char *fullname = NULL;

2585

2505

2586

2506

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

2587

2507

free(direntries);

2588

if(numentries == -1){

2508

if (numentries == -1){

2589

2509

perror_plus("scandir");

2590

2510

}

2591

2511

ret = rmdir(tempdir);