/mandos/release : revision 237.7.238

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

60

61

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

61

62

*/

73

74

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

74

75

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

75

76

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

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

91

92

argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

94

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

94

97

95

98

#ifdef __linux__

96

99

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

180

183

perror(print_text);

181

184

}

182

185

183

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

186

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

184

187

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

185

188

va_list ap;

186

189

va_start (ap, format);

195

198

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

196

199

* "buffer_length" is how much is already used.

197

200

*/

201

__attribute__((nonnull, warn_unused_result))

198

202

size_t incbuffer(char **buffer, size_t buffer_length,

199

203

size_t buffer_capacity){

200

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

213

217

}

214

218

215

219

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

220

__attribute__((nonnull, warn_unused_result))

216

221

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

217

222

int af, server **current_server){

218

223

int ret;

229

234

perror_plus("strdup");

230

235

return false;

231

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

232

242

/* Special case of first server */

233

243

if(*current_server == NULL){

234

244

new_server->next = new_server;

235

245

new_server->prev = new_server;

236

246

*current_server = new_server;

237

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

238

247

} else {

248

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

239

249

new_server->next = *current_server;

240

250

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

241

251

new_server->prev->next = new_server;

242

252

(*current_server)->prev = new_server;

243

253

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

return false;

248

}

249

254

return true;

250

255

}

251

256

252

257

/*

253

258

* Initialize GPGME.

254

259

*/

255

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

256

const char *tempdir, mandos_context *mc){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

257

265

gpgme_error_t rc;

258

266

gpgme_engine_info_t engine_info;

259

267

260

268

/*

261

269

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

262

270

*/

263

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

264

272

int ret;

265

273

int fd;

266

274

gpgme_data_t pgp_data;

347

355

* Decrypt OpenPGP data.

348

356

* Returns -1 on error

349

357

*/

358

__attribute__((nonnull, warn_unused_result))

350

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

351

360

size_t crypto_size,

352

361

char **plaintext,

472

481

return plaintext_length;

473

482

}

474

483

475

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

476

486

const char *ret = gnutls_strerror(value);

477

487

if(ret == NULL)

478

488

ret = "(unknown)";

480

490

}

481

491

482

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

483

494

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

484

495

const char* string){

485

496

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

486

497

}

487

498

499

__attribute__((nonnull, warn_unused_result))

488

500

static int init_gnutls_global(const char *pubkeyfilename,

489

501

const char *seckeyfilename,

490

502

mandos_context *mc){

564

576

return -1;

565

577

}

566

578

579

__attribute__((nonnull, warn_unused_result))

567

580

static int init_gnutls_session(gnutls_session_t *session,

568

581

mandos_context *mc){

569

582

int ret;

626

639

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

627

640

628

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

629

643

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

630

644

AvahiIfIndex if_index,

631

645

int af, mandos_context *mc){

632

646

int ret, tcp_sd = -1;

633

647

ssize_t sret;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

648

struct sockaddr_storage to;

638

649

char *buffer = NULL;

639

650

char *decrypted_buffer = NULL;

640

651

size_t buffer_length = 0;

721

732

722

733

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

723

734

if(af == AF_INET6){

724

to.in6.sin6_family = (sa_family_t)af;

725

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

735

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

736

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

726

737

} else { /* IPv4 */

727

to.in.sin_family = (sa_family_t)af;

728

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

738

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

739

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

729

740

}

730

741

if(ret < 0 ){

731

742

int e = errno;

740

751

goto mandos_end;

741

752

}

742

753

if(af == AF_INET6){

743

to.in6.sin6_port = htons(port);

744

#ifdef __GNUC__

745

#pragma GCC diagnostic push

746

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

747

#endif

748

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

749

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

750

#ifdef __GNUC__

751

#pragma GCC diagnostic pop

752

#endif

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

753

757

if(if_index == AVAHI_IF_UNSPEC){

754

758

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

755

759

" incomplete without a network interface\n");

757

761

goto mandos_end;

758

762

}

759

763

/* Set the network interface number as scope */

760

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

761

765

}

762

766

} else {

763

to.in.sin_port = htons(port);

767

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

764

768

}

765

769

766

770

if(quit_now){

783

787

}

784

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

785

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

const char *pcret;

787

790

if(af == AF_INET6){

788

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

789

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

790

795

} else {

791

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

792

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

793

800

}

794

if(pcret == NULL){

795

perror_plus("inet_ntop");

796

} else {

797

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

798

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

799

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

800

807

}

801

808

}

802

809

806

813

}

807

814

808

815

if(af == AF_INET6){

809

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

816

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

817

sizeof(struct sockaddr_in6));

810

818

} else {

811

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

819

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

820

sizeof(struct sockaddr_in));

812

821

}

813

822

if(ret < 0){

814

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

823

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

815

824

int e = errno;

816

825

perror_plus("connect");

817

826

errno = e;

1032

1041

return retval;

1033

1042

}

1034

1043

1044

__attribute__((nonnull))

1035

1045

static void resolve_callback(AvahiSServiceResolver *r,

1036

1046

AvahiIfIndex interface,

1037

1047

AvahiProtocol proto,

1045

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1046

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1047

1057

flags,

1048

void* mc){

1058

void *mc){

1049

1059

if(r == NULL){

1050

1060

return;

1051

1061

}

1104

1114

const char *domain,

1105

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1106

1116

flags,

1107

void* mc){

1117

void *mc){

1108

1118

if(b == NULL){

1109

1119

return;

1110

1120

}

1170

1180

errno = old_errno;

1171

1181

}

1172

1182

1183

__attribute__((nonnull, warn_unused_result))

1173

1184

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

1174

1185

int ret;

1175

1186

error_t ret_errno;

1194

1205

return true;

1195

1206

}

1196

1207

1208

__attribute__((nonnull, warn_unused_result))

1197

1209

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

1198

1210

1199

1211

/* Reject the loopback device */

1241

1253

* corresponds to an acceptable network device.

1242

1254

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

1243

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1244

1257

int good_interface(const struct dirent *if_entry){

1245

1258

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

1246

1259

return 0;

1264

1277

/*

1265

1278

* This function determines if a network interface is up.

1266

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1267

1281

bool interface_is_up(const char *interface){

1268

1282

struct ifreq ifr;

1269

1283

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

1280

1294

/*

1281

1295

* This function determines if a network interface is running

1282

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1283

1298

bool interface_is_running(const char *interface){

1284

1299

struct ifreq ifr;

1285

1300

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

1293

1308

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

1294

1309

}

1295

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1296

1312

int notdotentries(const struct dirent *direntry){

1297

1313

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

1298

1314

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

1305

1321

}

1306

1322

1307

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1308

1325

int runnable_hook(const struct dirent *direntry){

1309

1326

int ret;

1310

1327

size_t sret;

1318

1335

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

1319

1336

"abcdefghijklmnopqrstuvwxyz"

1320

1337

"0123456789"

1321

"_-");

1338

"_.-");

1322

1339

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

1323

1340

/* Contains non-allowed characters */

1324

1341

if(debug){

1342

1359

}

1343

1360

return 0;

1344

1361

}

1362

free(fullname);

1345

1363

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

1346

1364

/* Not a regular file */

1347

1365

if(debug){

1365

1383

return 1;

1366

1384

}

1367

1385

1386

__attribute__((nonnull, warn_unused_result))

1368

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1369

1388

mandos_context *mc){

1370

1389

int ret;

1374

1393

1375

1394

while(true){

1376

1395

if(mc->current_server == NULL){

1377

if (debug){

1396

if(debug){

1378

1397

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

1379

1398

" No timeout!\n");

1380

1399

}

1381

1400

ret = avahi_simple_poll_iterate(s, -1);

1382

1401

} else {

1383

if (debug){

1402

if(debug){

1384

1403

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

1385

1404

" it, or wait\n");

1386

1405

}

1403

1422

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

1404

1423

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

1405

1424

1406

if (debug){

1425

if(debug){

1407

1426

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

1408

1427

block_time);

1409

1428

}

1431

1450

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

1432

1451

}

1433

1452

if(ret != 0){

1434

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

1453

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

1435

1454

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

1436

1455

}

1437

1456

}

1439

1458

}

1440

1459

1441

1460

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

1461

__attribute__((warn_unused_result))

1442

1462

error_t raise_privileges(void){

1443

1463

error_t old_errno = errno;

1444

1464

error_t ret_errno = 0;

1451

1471

}

1452

1472

1453

1473

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

1474

__attribute__((warn_unused_result))

1454

1475

error_t raise_privileges_permanently(void){

1455

1476

error_t old_errno = errno;

1456

1477

error_t ret_errno = raise_privileges();

1467

1488

}

1468

1489

1469

1490

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

1491

__attribute__((warn_unused_result))

1470

1492

error_t lower_privileges(void){

1471

1493

error_t old_errno = errno;

1472

1494

error_t ret_errno = 0;

1479

1501

}

1480

1502

1481

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1482

1505

error_t lower_privileges_permanently(void){

1483

1506

error_t old_errno = errno;

1484

1507

error_t ret_errno = 0;

1490

1513

return ret_errno;

1491

1514

}

1492

1515

1493

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

1516

__attribute__((nonnull))

1517

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

1494

1518

const float delay){

1495

1519

struct dirent **direntries;

1496

1520

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

1524

1548

if(hook_pid == 0){

1525

1549

/* Child */

1526

1550

/* Raise privileges */

1527

raise_privileges_permanently();

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1528

1555

/* Set group */

1529

1556

errno = 0;

1530

1557

ret = setgid(0);

1531

1558

if(ret == -1){

1532

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1533

1561

}

1534

1562

/* Reset supplementary groups */

1535

1563

errno = 0;

1536

1564

ret = setgroups(0, NULL);

1537

1565

if(ret == -1){

1538

1566

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1543

1584

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

1544

1585

if(ret == -1){

1545

1586

perror_plus("setenv");

1561

1602

_exit(EX_OSERR);

1562

1603

}

1563

1604

char *delaystring;

1564

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

1605

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

1565

1606

if(ret == -1){

1566

1607

perror_plus("asprintf");

1567

1608

_exit(EX_OSERR);

1620

1661

}

1621

1662

close(devnull);

1622

1663

}

1623

return true;

1624

1664

}

1625

1665

1666

__attribute__((nonnull, warn_unused_result))

1626

1667

error_t bring_up_interface(const char *const interface,

1627

1668

const float delay){

1628

int sd = -1;

1629

1669

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

1670

int ret;

1632

1671

struct ifreq network;

1633

1672

unsigned int if_index = if_nametoindex(interface);

1634

1673

if(if_index == 0){

1643

1682

}

1644

1683

1645

1684

if(not interface_is_up(interface)){

1646

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

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1647

1687

ret_errno = errno;

1648

1688

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

1649

1689

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

1690

errno = old_errno;

1650

1691

return ret_errno;

1651

1692

}

1652

network.ifr_flags |= IFF_UP;

1693

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

1653

1694

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

1695

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

1696

if(sd == -1){

1656

1697

ret_errno = errno;

1657

1698

perror_plus("socket");

1658

1699

errno = old_errno;

1659

1700

return ret_errno;

1660

1701

}

1661

1702

1662

1703

if(quit_now){

1663

close(sd);

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1664

1708

errno = old_errno;

1665

1709

return EINTR;

1666

1710

}

1670

1714

interface);

1671

1715

}

1672

1716

1673

/* Raise priviliges */

1674

raise_privileges();

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1675

1722

1676

1723

#ifdef __linux__

1677

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1678

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

1679

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

1680

bool restore_loglevel = true;

1681

if(ret_linux == -1){

1682

restore_loglevel = false;

1683

perror_plus("klogctl");

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1684

1735

}

1685

1736

#endif /* __linux__ */

1686

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

1687

ret_errno = errno;

1737

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

1738

ioctl_errno = errno;

1688

1739

#ifdef __linux__

1689

1740

if(restore_loglevel){

1690

1741

ret_linux = klogctl(7, NULL, 0);

1694

1745

}

1695

1746

#endif /* __linux__ */

1696

1747

1697

/* Lower privileges */

1698

lower_privileges();

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1699

1757

1700

1758

/* Close the socket */

1701

1759

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

1704

1762

}

1705

1763

1706

1764

if(ret_setflags == -1){

1707

errno = ret_errno;

1765

errno = ioctl_errno;

1708

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1709

1767

errno = old_errno;

1710

return ret_errno;

1768

return ioctl_errno;

1711

1769

}

1712

1770

} else if(debug){

1713

1771

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

1731

1789

return 0;

1732

1790

}

1733

1791

1792

__attribute__((nonnull, warn_unused_result))

1734

1793

error_t take_down_interface(const char *const interface){

1735

1794

error_t old_errno = errno;

1736

1795

struct ifreq network;

1741

1800

return ENXIO;

1742

1801

}

1743

1802

if(interface_is_up(interface)){

1744

error_t ret_errno = 0;

1803

error_t ret_errno = 0, ioctl_errno = 0;

1745

1804

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

1746

1805

ret_errno = errno;

1747

1806

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

1748

1807

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

1808

errno = old_errno;

1749

1809

return ret_errno;

1750

1810

}

1751

1811

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

1752

1812

1753

1813

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

1754

if(sd < 0){

1814

if(sd == -1){

1755

1815

ret_errno = errno;

1756

1816

perror_plus("socket");

1757

1817

errno = old_errno;

1763

1823

interface);

1764

1824

}

1765

1825

1766

/* Raise priviliges */

1767

raise_privileges();

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1768

1831

1769

1832

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

1770

ret_errno = errno;

1833

ioctl_errno = errno;

1771

1834

1772

/* Lower privileges */

1773

lower_privileges();

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1774

1844

1775

1845

/* Close the socket */

1776

1846

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

1779

1849

}

1780

1850

1781

1851

if(ret_setflags == -1){

1782

errno = ret_errno;

1852

errno = ioctl_errno;

1783

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1784

1854

errno = old_errno;

1785

return ret_errno;

1855

return ioctl_errno;

1786

1856

}

1787

1857

} else if(debug){

1788

1858

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

1796

1866

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

1797

1867

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

1798

1868

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

1799

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

1869

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

1800

1870

.interfaces = NULL, .interfaces_size = 0 };

1801

1871

AvahiSServiceBrowser *sb = NULL;

1802

1872

error_t ret_errno;

1806

1876

int exitcode = EXIT_SUCCESS;

1807

1877

char *interfaces_to_take_down = NULL;

1808

1878

size_t interfaces_to_take_down_size = 0;

1809

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

1810

bool tempdir_created = false;

1879

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

1880

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

1881

char *tempdir = NULL;

1811

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1812

1883

const char *seckey = PATHDIR "/" SECKEY;

1813

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1995

2066

/* Work around Debian bug #633582:

1996

2067

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

1997

2068

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

2000

2075

struct stat st;

2001

2076

2002

2077

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

2042

2117

}

2043

2118

2044

2119

/* Lower privileges */

2045

lower_privileges();

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2046

2125

}

2047

2126

}

2048

2127

2074

2153

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

2075

2154

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

2076

2155

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2081

2158

}

2082

2159

2083

2160

if(not debug){

2211

2288

break;

2212

2289

}

2213

2290

bool interface_was_up = interface_is_up(interface);

2214

ret = bring_up_interface(interface, delay);

2291

errno = bring_up_interface(interface, delay);

2215

2292

if(not interface_was_up){

2216

if(ret != 0){

2217

errno = ret;

2293

if(errno != 0){

2218

2294

perror_plus("Failed to bring up interface");

2219

2295

} else {

2220

ret_errno = argz_add(&interfaces_to_take_down,

2221

&interfaces_to_take_down_size,

2222

interface);

2223

if(ret_errno != 0){

2224

errno = ret_errno;

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2225

2300

perror_plus("argz_add");

2226

2301

}

2227

2302

}

2258

2333

goto end;

2259

2334

}

2260

2335

2261

if(mkdtemp(tempdir) == NULL){

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2262

2346

perror_plus("mkdtemp");

2263

2347

goto end;

2264

2348

}

2265

tempdir_created = true;

2266

2349

2267

2350

if(quit_now){

2268

2351

goto end;

2343

2426

sleep((unsigned int)retry_interval);

2344

2427

}

2345

2428

2346

if (not quit_now){

2429

if(not quit_now){

2347

2430

exitcode = EXIT_SUCCESS;

2348

2431

}

2349

2432

2404

2487

if(debug){

2405

2488

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

2406

2489

}

2407

2490

2408

2491

ret = avahi_loop_with_timeout(simple_poll,

2409

2492

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

2410

2493

if(debug){

2451

2534

}

2452

2535

}

2453

2536

2454

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2455

2538

{

2456

raise_privileges();

2457

2458

/* Run network hooks */

2459

run_network_hooks("stop", interfaces_hooks != NULL ?

2460

interfaces_hooks : "", delay);

2461

2462

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

2463

{

2464

char *interface = NULL;

2465

while((interface=argz_next(interfaces_to_take_down,

2466

interfaces_to_take_down_size,

2467

interface))){

2468

ret_errno = take_down_interface(interface);

2469

if(ret_errno != 0){

2470

errno = ret_errno;

2471

perror_plus("Failed to take down interface");

2472

}

2473

}

2474

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

2475

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

2476

" down\n");

2477

}

2478

}

2479

2480

lower_privileges_permanently();

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

2481

2571

}

2482

2572

2483

2573

free(interfaces_to_take_down);

2484

2574

free(interfaces_hooks);

2485

2575

2486

2576

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

2487

if(tempdir_created){

2577

if(tempdir != NULL){

2488

2578

struct dirent **direntries = NULL;

2489

2579

struct dirent *direntry = NULL;

2490

2580

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

2491

2581

alphasort);

2492

if (numentries > 0){

2582

if(numentries > 0){

2493

2583

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

2494

2584

direntry = direntries[i];

2495

2585

char *fullname = NULL;

2507

2597

free(fullname);

2508

2598

}

2509

2599

}

2510

2600

2511

2601

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

2512

2602

free(direntries);

2513

if (numentries == -1){

2603

if(numentries == -1){

2514

2604

perror_plus("scandir");

2515

2605

}

2516

2606

ret = rmdir(tempdir);