/mandos/trunk : revision 691

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

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;

144

145

uid_t uid = 65534;

145

146

gid_t gid = 65534;

146

147

183

184

perror(print_text);

184

185

}

185

186

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

187

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

187

188

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

188

189

va_list ap;

189

190

va_start (ap, format);

198

199

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

199

200

* "buffer_length" is how much is already used.

200

201

*/

202

__attribute__((nonnull, warn_unused_result))

201

203

size_t incbuffer(char **buffer, size_t buffer_length,

202

204

size_t buffer_capacity){

203

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

216

218

}

217

219

218

220

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

221

__attribute__((nonnull, warn_unused_result))

219

222

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

220

223

int af, server **current_server){

221

224

int ret;

242

245

new_server->next = new_server;

243

246

new_server->prev = new_server;

244

247

*current_server = new_server;

245

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

246

248

} else {

249

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

247

250

new_server->next = *current_server;

248

251

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

249

252

new_server->prev->next = new_server;

255

258

/*

256

259

* Initialize GPGME.

257

260

*/

258

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

259

const char *tempdir, mandos_context *mc){

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){

260

266

gpgme_error_t rc;

261

267

gpgme_engine_info_t engine_info;

262

268

263

269

/*

264

270

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

265

271

*/

266

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

267

273

int ret;

268

274

int fd;

269

275

gpgme_data_t pgp_data;

350

356

* Decrypt OpenPGP data.

351

357

* Returns -1 on error

352

358

*/

359

__attribute__((nonnull, warn_unused_result))

353

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

361

size_t crypto_size,

355

362

char **plaintext,

475

482

return plaintext_length;

476

483

}

477

484

478

static const char * safer_gnutls_strerror(int value){

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

479

487

const char *ret = gnutls_strerror(value);

480

488

if(ret == NULL)

481

489

ret = "(unknown)";

483

491

}

484

492

485

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

486

495

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

487

496

const char* string){

488

497

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

489

498

}

490

499

500

__attribute__((nonnull, warn_unused_result))

491

501

static int init_gnutls_global(const char *pubkeyfilename,

492

502

const char *seckeyfilename,

493

503

mandos_context *mc){

567

577

return -1;

568

578

}

569

579

580

__attribute__((nonnull, warn_unused_result))

570

581

static int init_gnutls_session(gnutls_session_t *session,

571

582

mandos_context *mc){

572

583

int ret;

629

640

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

630

641

631

642

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

632

644

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

633

645

AvahiIfIndex if_index,

634

646

int af, mandos_context *mc){

740

752

goto mandos_end;

741

753

}

742

754

if(af == AF_INET6){

743

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

755

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

744

756

if(IN6_IS_ADDR_LINKLOCAL

745

757

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

746

758

if(if_index == AVAHI_IF_UNSPEC){

1030

1042

return retval;

1031

1043

}

1032

1044

1045

__attribute__((nonnull))

1033

1046

static void resolve_callback(AvahiSServiceResolver *r,

1034

1047

AvahiIfIndex interface,

1035

1048

AvahiProtocol proto,

1043

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1058

flags,

1046

void* mc){

1059

void *mc){

1047

1060

if(r == NULL){

1048

1061

return;

1049

1062

}

1102

1115

const char *domain,

1103

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1117

flags,

1105

void* mc){

1118

void *mc){

1106

1119

if(b == NULL){

1107

1120

return;

1108

1121

}

1168

1181

errno = old_errno;

1169

1182

}

1170

1183

1184

__attribute__((nonnull, warn_unused_result))

1171

1185

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

1172

1186

int ret;

1173

1187

error_t ret_errno;

1192

1206

return true;

1193

1207

}

1194

1208

1209

__attribute__((nonnull, warn_unused_result))

1195

1210

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

1196

1211

1197

1212

/* Reject the loopback device */

1239

1254

* corresponds to an acceptable network device.

1240

1255

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

1241

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1242

1258

int good_interface(const struct dirent *if_entry){

1243

1259

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

1244

1260

return 0;

1262

1278

/*

1263

1279

* This function determines if a network interface is up.

1264

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1265

1282

bool interface_is_up(const char *interface){

1266

1283

struct ifreq ifr;

1267

1284

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

1278

1295

/*

1279

1296

* This function determines if a network interface is running

1280

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1281

1299

bool interface_is_running(const char *interface){

1282

1300

struct ifreq ifr;

1283

1301

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

1291

1309

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

1292

1310

}

1293

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1294

1313

int notdotentries(const struct dirent *direntry){

1295

1314

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

1296

1315

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

1303

1322

}

1304

1323

1305

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1306

1326

int runnable_hook(const struct dirent *direntry){

1307

1327

int ret;

1308

1328

size_t sret;

1316

1336

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

1317

1337

"abcdefghijklmnopqrstuvwxyz"

1318

1338

"0123456789"

1319

"_-");

1339

"_.-");

1320

1340

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

1321

1341

/* Contains non-allowed characters */

1322

1342

if(debug){

1340

1360

}

1341

1361

return 0;

1342

1362

}

1363

free(fullname);

1343

1364

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

1344

1365

/* Not a regular file */

1345

1366

if(debug){

1363

1384

return 1;

1364

1385

}

1365

1386

1387

__attribute__((nonnull, warn_unused_result))

1366

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

1389

mandos_context *mc){

1368

1390

int ret;

1437

1459

}

1438

1460

1439

1461

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

1462

__attribute__((warn_unused_result))

1440

1463

error_t raise_privileges(void){

1441

1464

error_t old_errno = errno;

1442

1465

error_t ret_errno = 0;

1449

1472

}

1450

1473

1451

1474

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

1475

__attribute__((warn_unused_result))

1452

1476

error_t raise_privileges_permanently(void){

1453

1477

error_t old_errno = errno;

1454

1478

error_t ret_errno = raise_privileges();

1465

1489

}

1466

1490

1467

1491

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

1492

__attribute__((warn_unused_result))

1468

1493

error_t lower_privileges(void){

1469

1494

error_t old_errno = errno;

1470

1495

error_t ret_errno = 0;

1477

1502

}

1478

1503

1479

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1480

1506

error_t lower_privileges_permanently(void){

1481

1507

error_t old_errno = errno;

1482

1508

error_t ret_errno = 0;

1488

1514

return ret_errno;

1489

1515

}

1490

1516

1491

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

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,

1492

1538

const float delay){

1493

1539

struct dirent **direntries;

1494

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

1495

alphasort);

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__ */

1496

1583

if(numhooks == -1){

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");

1504

}

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){

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

char *fullname = NULL;

1593

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

1594

if(ret < 0){

1595

perror_plus("asprintf");

1596

continue;

1597

}

1598

if(debug){

1599

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

1600

direntry->d_name);

1601

}

1602

pid_t hook_pid = fork();

1603

if(hook_pid == 0){

1604

/* Child */

1605

/* Raise privileges */

1606

if(raise_privileges_permanently() != 0){

1607

perror_plus("Failed to raise privileges");

1608

_exit(EX_NOPERM);

1609

}

1610

/* Set group */

1611

errno = 0;

1612

ret = setgid(0);

1613

if(ret == -1){

1614

perror_plus("setgid");

1615

_exit(EX_NOPERM);

1616

}

1617

/* Reset supplementary groups */

1618

errno = 0;

1619

ret = setgroups(0, NULL);

1620

if(ret == -1){

1621

perror_plus("setgroups");

1622

_exit(EX_NOPERM);

1623

}

1624

ret = dup2(devnull, STDIN_FILENO);

1625

if(ret == -1){

1626

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

1627

_exit(EX_OSERR);

1628

}

1629

ret = close(devnull);

1630

if(ret == -1){

1631

perror_plus("close");

1632

_exit(EX_OSERR);

1633

}

1634

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1635

if(ret == -1){

1636

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

1637

_exit(EX_OSERR);

1638

}

1639

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

1640

if(ret == -1){

1641

perror_plus("setenv");

1642

_exit(EX_OSERR);

1643

}

1644

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

1645

if(ret == -1){

1646

perror_plus("setenv");

1647

_exit(EX_OSERR);

1648

}

1649

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

1650

if(ret == -1){

1651

perror_plus("setenv");

1652

_exit(EX_OSERR);

1653

}

1654

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

1655

if(ret == -1){

1656

perror_plus("setenv");

1657

_exit(EX_OSERR);

1658

}

1659

char *delaystring;

1660

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

1661

if(ret == -1){

1514

1662

perror_plus("asprintf");

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

}

1663

_exit(EX_OSERR);

1664

}

1665

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

1666

if(ret == -1){

1573

1667

free(delaystring);

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

}

1668

perror_plus("setenv");

1669

_exit(EX_OSERR);

1670

}

1671

free(delaystring);

1672

if(connect_to != NULL){

1673

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

1674

if(ret == -1){

1675

perror_plus("setenv");

1676

_exit(EX_OSERR);

1677

}

1678

}

1679

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

1680

perror_plus("execl");

1681

_exit(EXIT_FAILURE);

1682

}

1683

} else {

1684

int status;

1685

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

1686

perror_plus("waitpid");

1687

free(fullname);

1688

continue;

1689

}

1690

if(WIFEXITED(status)){

1691

if(WEXITSTATUS(status) != 0){

1692

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

1693

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

1694

WEXITSTATUS(status));

1695

free(fullname);

1696

continue;

1697

}

1698

} else if(WIFSIGNALED(status)){

1699

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

1700

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

1701

WTERMSIG(status));

1702

free(fullname);

1703

continue;

1585

1704

} else {

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;

1705

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

1706

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

1707

free(fullname);

1708

continue;

1709

}

1710

}

1711

free(fullname);

1712

if(debug){

1713

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

1714

direntry->d_name);

1715

}

1716

}

1717

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

1718

perror_plus("close");

1719

} else {

1720

hookdir_fd = -1;

1721

}

1722

close(devnull);

1622

1723

}

1623

1724

1725

__attribute__((nonnull, warn_unused_result))

1624

1726

error_t bring_up_interface(const char *const interface,

1625

1727

const float delay){

1626

int sd = -1;

1627

1728

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1729

int ret;

1630

1730

struct ifreq network;

1631

1731

unsigned int if_index = if_nametoindex(interface);

1632

1732

if(if_index == 0){

1641

1741

}

1642

1742

1643

1743

if(not interface_is_up(interface)){

1644

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

1744

error_t ret_errno = 0, ioctl_errno = 0;

1745

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

1645

1746

ret_errno = errno;

1646

1747

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

1647

1748

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

1749

errno = old_errno;

1648

1750

return ret_errno;

1649

1751

}

1650

network.ifr_flags |= IFF_UP;

1752

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

1651

1753

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1754

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

1755

if(sd == -1){

1654

1756

ret_errno = errno;

1655

1757

perror_plus("socket");

1656

1758

errno = old_errno;

1657

1759

return ret_errno;

1658

1760

}

1659

1761

1660

1762

if(quit_now){

1661

close(sd);

1763

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

1764

if(ret == -1){

1765

perror_plus("close");

1766

}

1662

1767

errno = old_errno;

1663

1768

return EINTR;

1664

1769

}

1668

1773

interface);

1669

1774

}

1670

1775

1671

/* Raise priviliges */

1672

raise_privileges();

1776

/* Raise privileges */

1777

ret_errno = raise_privileges();

1778

if(ret_errno != 0){

1779

perror_plus("Failed to raise privileges");

1780

}

1673

1781

1674

1782

#ifdef __linux__

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");

1783

int ret_linux;

1784

bool restore_loglevel = false;

1785

if(ret_errno == 0){

1786

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1787

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

1788

ret_linux = klogctl(8, NULL, 5);

1789

if(ret_linux == -1){

1790

perror_plus("klogctl");

1791

} else {

1792

restore_loglevel = true;

1793

}

1682

1794

}

1683

1795

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1796

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

1797

ioctl_errno = errno;

1686

1798

#ifdef __linux__

1687

1799

if(restore_loglevel){

1688

1800

ret_linux = klogctl(7, NULL, 0);

1692

1804

}

1693

1805

#endif /* __linux__ */

1694

1806

1695

/* Lower privileges */

1696

lower_privileges();

1807

/* If raise_privileges() succeeded above */

1808

if(ret_errno == 0){

1809

/* Lower privileges */

1810

ret_errno = lower_privileges();

1811

if(ret_errno != 0){

1812

errno = ret_errno;

1813

perror_plus("Failed to lower privileges");

1814

}

1815

}

1697

1816

1698

1817

/* Close the socket */

1699

1818

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

1702

1821

}

1703

1822

1704

1823

if(ret_setflags == -1){

1705

errno = ret_errno;

1824

errno = ioctl_errno;

1706

1825

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

1826

errno = old_errno;

1708

return ret_errno;

1827

return ioctl_errno;

1709

1828

}

1710

1829

} else if(debug){

1711

1830

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

1729

1848

return 0;

1730

1849

}

1731

1850

1851

__attribute__((nonnull, warn_unused_result))

1732

1852

error_t take_down_interface(const char *const interface){

1733

1853

error_t old_errno = errno;

1734

1854

struct ifreq network;

1739

1859

return ENXIO;

1740

1860

}

1741

1861

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1862

error_t ret_errno = 0, ioctl_errno = 0;

1743

1863

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

1744

1864

ret_errno = errno;

1745

1865

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

1746

1866

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

1867

errno = old_errno;

1747

1868

return ret_errno;

1748

1869

}

1749

1870

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

1750

1871

1751

1872

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

1752

if(sd < 0){

1873

if(sd == -1){

1753

1874

ret_errno = errno;

1754

1875

perror_plus("socket");

1755

1876

errno = old_errno;

1761

1882

interface);

1762

1883

}

1763

1884

1764

/* Raise priviliges */

1765

raise_privileges();

1885

/* Raise privileges */

1886

ret_errno = raise_privileges();

1887

if(ret_errno != 0){

1888

perror_plus("Failed to raise privileges");

1889

}

1766

1890

1767

1891

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

1768

ret_errno = errno;

1892

ioctl_errno = errno;

1769

1893

1770

/* Lower privileges */

1771

lower_privileges();

1894

/* If raise_privileges() succeeded above */

1895

if(ret_errno == 0){

1896

/* Lower privileges */

1897

ret_errno = lower_privileges();

1898

if(ret_errno != 0){

1899

errno = ret_errno;

1900

perror_plus("Failed to lower privileges");

1901

}

1902

}

1772

1903

1773

1904

/* Close the socket */

1774

1905

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

1777

1908

}

1778

1909

1779

1910

if(ret_setflags == -1){

1780

errno = ret_errno;

1911

errno = ioctl_errno;

1781

1912

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

1913

errno = old_errno;

1783

return ret_errno;

1914

return ioctl_errno;

1784

1915

}

1785

1916

} else if(debug){

1786

1917

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

1794

1925

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

1795

1926

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

1796

1927

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

1797

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

1928

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

1798

1929

.interfaces = NULL, .interfaces_size = 0 };

1799

1930

AvahiSServiceBrowser *sb = NULL;

1800

1931

error_t ret_errno;

1804

1935

int exitcode = EXIT_SUCCESS;

1805

1936

char *interfaces_to_take_down = NULL;

1806

1937

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

1938

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

1939

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

1940

char *tempdir = NULL;

1809

1941

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1942

const char *seckey = PATHDIR "/" SECKEY;

1811

1943

const char *pubkey = PATHDIR "/" PUBKEY;

1993

2125

/* Work around Debian bug #633582:

1994

2126

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

1995

2127

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2128

/* Re-raise privileges */

2129

ret_errno = raise_privileges();

2130

if(ret_errno != 0){

2131

errno = ret_errno;

2132

perror_plus("Failed to raise privileges");

2133

} else {

1998

2134

struct stat st;

1999

2135

2000

2136

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

2040

2176

}

2041

2177

2042

2178

/* Lower privileges */

2043

lower_privileges();

2179

ret_errno = lower_privileges();

2180

if(ret_errno != 0){

2181

errno = ret_errno;

2182

perror_plus("Failed to lower privileges");

2183

}

2044

2184

}

2045

2185

}

2046

2186

2072

2212

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

2073

2213

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

2074

2214

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2215

run_network_hooks("start", interfaces_hooks != NULL ?

2216

interfaces_hooks : "", delay);

2079

2217

}

2080

2218

2081

2219

if(not debug){

2209

2347

break;

2210

2348

}

2211

2349

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2350

errno = bring_up_interface(interface, delay);

2213

2351

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2352

if(errno != 0){

2216

2353

perror_plus("Failed to bring up interface");

2217

2354

} else {

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;

2355

errno = argz_add(&interfaces_to_take_down,

2356

&interfaces_to_take_down_size,

2357

interface);

2358

if(errno != 0){

2223

2359

perror_plus("argz_add");

2224

2360

}

2225

2361

}

2256

2392

goto end;

2257

2393

}

2258

2394

2259

if(mkdtemp(tempdir) == NULL){

2395

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

2396

tempdir = mkdtemp(run_tempdir);

2397

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

2398

if(debug){

2399

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

2400

run_tempdir, old_tempdir);

2401

}

2402

tempdir = mkdtemp(old_tempdir);

2403

}

2404

if(tempdir == NULL){

2260

2405

perror_plus("mkdtemp");

2261

2406

goto end;

2262

2407

}

2263

tempdir_created = true;

2264

2408

2265

2409

if(quit_now){

2266

2410

goto end;

2402

2546

if(debug){

2403

2547

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

2404

2548

}

2405

2549

2406

2550

ret = avahi_loop_with_timeout(simple_poll,

2407

2551

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

2408

2552

if(debug){

2449

2593

}

2450

2594

}

2451

2595

2452

/* Re-raise priviliges */

2596

/* Re-raise privileges */

2453

2597

{

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();

2598

ret_errno = raise_privileges();

2599

if(ret_errno != 0){

2600

perror_plus("Failed to raise privileges");

2601

} else {

2602

2603

/* Run network hooks */

2604

run_network_hooks("stop", interfaces_hooks != NULL ?

2605

interfaces_hooks : "", delay);

2606

2607

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

2608

{

2609

char *interface = NULL;

2610

while((interface=argz_next(interfaces_to_take_down,

2611

interfaces_to_take_down_size,

2612

interface))){

2613

ret_errno = take_down_interface(interface);

2614

if(ret_errno != 0){

2615

errno = ret_errno;

2616

perror_plus("Failed to take down interface");

2617

}

2618

}

2619

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

2620

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

2621

" down\n");

2622

}

2623

}

2624

}

2625

2626

ret_errno = lower_privileges_permanently();

2627

if(ret_errno != 0){

2628

perror_plus("Failed to lower privileges permanently");

2629

}

2479

2630

}

2480

2631

2481

2632

free(interfaces_to_take_down);

2482

2633

free(interfaces_hooks);

2483

2634

2484

2635

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

2485

if(tempdir_created){

2636

if(tempdir != NULL){

2486

2637

struct dirent **direntries = NULL;

2487

2638

struct dirent *direntry = NULL;

2488

2639

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

2505

2656

free(fullname);

2506

2657

}

2507

2658

}

2508

2659

2509

2660

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

2510

2661

free(direntries);

2511

2662

if(numentries == -1){