/mandos/trunk : revision 632

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

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

755

742

if(if_index == AVAHI_IF_UNSPEC){

756

743

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

757

744

" incomplete without a network interface\n");

759

746

goto mandos_end;

760

747

}

761

748

/* Set the network interface number as scope */

762

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

763

750

}

764

751

} else {

765

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

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

766

755

}

767

756

768

757

if(quit_now){

785

774

}

786

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

787

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

788

778

if(af == AF_INET6){

789

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

790

sizeof(struct sockaddr_in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

779

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

780

sizeof(addrstr));

793

781

} else {

794

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

795

sizeof(struct sockaddr_in),

796

addrstr, sizeof(addrstr), NULL, 0,

797

NI_NUMERICHOST);

782

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

783

sizeof(addrstr));

798

784

}

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);

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

805

791

}

806

792

}

807

793

811

797

}

812

798

813

799

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

800

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

816

801

} else {

817

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

818

sizeof(struct sockaddr_in));

802

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

819

803

}

820

804

if(ret < 0){

821

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

805

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

822

806

int e = errno;

823

807

perror_plus("connect");

824

808

errno = e;

1039

1023

return retval;

1040

1024

}

1041

1025

1042

__attribute__((nonnull))

1043

1026

static void resolve_callback(AvahiSServiceResolver *r,

1044

1027

AvahiIfIndex interface,

1045

1028

AvahiProtocol proto,

1053

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1054

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1038

flags,

1056

void *mc){

1039

void* mc){

1057

1040

if(r == NULL){

1058

1041

return;

1059

1042

}

1112

1095

const char *domain,

1113

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1114

1097

flags,

1115

void *mc){

1098

void* mc){

1116

1099

if(b == NULL){

1117

1100

return;

1118

1101

}

1178

1161

errno = old_errno;

1179

1162

}

1180

1163

1181

__attribute__((nonnull, warn_unused_result))

1182

1164

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

1183

1165

int ret;

1184

1166

error_t ret_errno;

1203

1185

return true;

1204

1186

}

1205

1187

1206

__attribute__((nonnull, warn_unused_result))

1207

1188

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

1208

1189

1209

1190

/* Reject the loopback device */

1251

1232

* corresponds to an acceptable network device.

1252

1233

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

1253

1234

*/

1254

__attribute__((nonnull, warn_unused_result))

1255

1235

int good_interface(const struct dirent *if_entry){

1256

1236

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

1257

1237

return 0;

1275

1255

/*

1276

1256

* This function determines if a network interface is up.

1277

1257

*/

1278

__attribute__((nonnull, warn_unused_result))

1279

1258

bool interface_is_up(const char *interface){

1280

1259

struct ifreq ifr;

1281

1260

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

1292

1271

/*

1293

1272

* This function determines if a network interface is running

1294

1273

*/

1295

__attribute__((nonnull, warn_unused_result))

1296

1274

bool interface_is_running(const char *interface){

1297

1275

struct ifreq ifr;

1298

1276

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

1306

1284

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

1307

1285

}

1308

1286

1309

__attribute__((nonnull, pure, warn_unused_result))

1310

1287

int notdotentries(const struct dirent *direntry){

1311

1288

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

1312

1289

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

1319

1296

}

1320

1297

1321

1298

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

1322

__attribute__((nonnull, warn_unused_result))

1323

1299

int runnable_hook(const struct dirent *direntry){

1324

1300

int ret;

1325

1301

size_t sret;

1380

1356

return 1;

1381

1357

}

1382

1358

1383

__attribute__((nonnull, warn_unused_result))

1384

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

1360

mandos_context *mc){

1386

1361

int ret;

1390

1365

1391

1366

while(true){

1392

1367

if(mc->current_server == NULL){

1393

if(debug){

1368

if (debug){

1394

1369

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

1395

1370

" No timeout!\n");

1396

1371

}

1397

1372

ret = avahi_simple_poll_iterate(s, -1);

1398

1373

} else {

1399

if(debug){

1374

if (debug){

1400

1375

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

1401

1376

" it, or wait\n");

1402

1377

}

1419

1394

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

1420

1395

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

1421

1396

1422

if(debug){

1397

if (debug){

1423

1398

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

1424

1399

block_time);

1425

1400

}

1447

1422

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

1448

1423

}

1449

1424

if(ret != 0){

1450

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

1425

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

1451

1426

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

1452

1427

}

1453

1428

}

1455

1430

}

1456

1431

1457

1432

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

1458

__attribute__((warn_unused_result))

1459

1433

error_t raise_privileges(void){

1460

1434

error_t old_errno = errno;

1461

1435

error_t ret_errno = 0;

1468

1442

}

1469

1443

1470

1444

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

1471

__attribute__((warn_unused_result))

1472

1445

error_t raise_privileges_permanently(void){

1473

1446

error_t old_errno = errno;

1474

1447

error_t ret_errno = raise_privileges();

1485

1458

}

1486

1459

1487

1460

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

1488

__attribute__((warn_unused_result))

1489

1461

error_t lower_privileges(void){

1490

1462

error_t old_errno = errno;

1491

1463

error_t ret_errno = 0;

1498

1470

}

1499

1471

1500

1472

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

1473

error_t lower_privileges_permanently(void){

1503

1474

error_t old_errno = errno;

1504

1475

error_t ret_errno = 0;

1510

1481

return ret_errno;

1511

1482

}

1512

1483

1513

__attribute__((nonnull))

1514

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

1484

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

1515

1485

const float delay){

1516

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1517

1489

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

1518

1490

alphasort);

1519

1491

if(numhooks == -1){

1526

1498

perror_plus("scandir");

1527

1499

}

1528

1500

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

1501

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

1532

1502

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

1533

1503

direntry = direntries[i];

1545

1515

if(hook_pid == 0){

1546

1516

/* Child */

1547

1517

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1518

raise_privileges_permanently();

1552

1519

/* Set group */

1553

1520

errno = 0;

1554

1521

ret = setgid(0);

1555

1522

if(ret == -1){

1556

1523

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

1524

}

1559

1525

/* Reset supplementary groups */

1560

1526

errno = 0;

1561

1527

ret = setgroups(0, NULL);

1562

1528

if(ret == -1){

1563

1529

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

}

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1581

1534

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

1582

1535

if(ret == -1){

1583

1536

perror_plus("setenv");

1599

1552

_exit(EX_OSERR);

1600

1553

}

1601

1554

char *delaystring;

1602

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

1555

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

1603

1556

if(ret == -1){

1604

1557

perror_plus("asprintf");

1605

1558

_exit(EX_OSERR);

1658

1611

}

1659

1612

close(devnull);

1660

1613

}

1614

return true;

1661

1615

}

1662

1616

1663

__attribute__((nonnull, warn_unused_result))

1664

1617

error_t bring_up_interface(const char *const interface,

1665

1618

const float delay){

1619

int sd = -1;

1666

1620

error_t old_errno = errno;

1667

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1668

1623

struct ifreq network;

1669

1624

unsigned int if_index = if_nametoindex(interface);

1670

1625

if(if_index == 0){

1679

1634

}

1680

1635

1681

1636

if(not interface_is_up(interface)){

1682

error_t ret_errno = 0, ioctl_errno = 0;

1683

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

1637

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

1684

1638

ret_errno = errno;

1685

1639

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

1686

1640

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

1687

errno = old_errno;

1688

1641

return ret_errno;

1689

1642

}

1690

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

1643

network.ifr_flags |= IFF_UP;

1691

1644

1692

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

1693

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1694

1647

ret_errno = errno;

1695

1648

perror_plus("socket");

1696

1649

errno = old_errno;

1697

1650

return ret_errno;

1698

1651

}

1699

1652

1700

1653

if(quit_now){

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1654

close(sd);

1705

1655

errno = old_errno;

1706

1656

return EINTR;

1707

1657

}

1711

1661

interface);

1712

1662

}

1713

1663

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

}

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1720

1667

#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

}

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1731

1675

}

1732

1676

#endif /* __linux__ */

1733

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

1734

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

1735

1679

#ifdef __linux__

1736

1680

if(restore_loglevel){

1737

1681

ret_linux = klogctl(7, NULL, 0);

1741

1685

}

1742

1686

#endif /* __linux__ */

1743

1687

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

}

1688

/* Lower privileges */

1689

lower_privileges();

1753

1690

1754

1691

/* Close the socket */

1755

1692

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

1758

1695

}

1759

1696

1760

1697

if(ret_setflags == -1){

1761

errno = ioctl_errno;

1698

errno = ret_errno;

1762

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1763

1700

errno = old_errno;

1764

return ioctl_errno;

1701

return ret_errno;

1765

1702

}

1766

1703

} else if(debug){

1767

1704

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

1785

1722

return 0;

1786

1723

}

1787

1724

1788

__attribute__((nonnull, warn_unused_result))

1789

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1790

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1791

1730

struct ifreq network;

1792

1731

unsigned int if_index = if_nametoindex(interface);

1793

1732

if(if_index == 0){

1796

1735

return ENXIO;

1797

1736

}

1798

1737

if(interface_is_up(interface)){

1799

error_t ret_errno = 0, ioctl_errno = 0;

1800

1738

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

1801

1739

ret_errno = errno;

1802

1740

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

1803

1741

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

1804

errno = old_errno;

1805

1742

return ret_errno;

1806

1743

}

1807

1744

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

1808

1745

1809

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

1810

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1811

1748

ret_errno = errno;

1812

1749

perror_plus("socket");

1813

1750

errno = old_errno;

1819

1756

interface);

1820

1757

}

1821

1758

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

}

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1839

1767

1840

1768

/* Close the socket */

1841

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

1769

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

1842

1770

if(ret == -1){

1843

1771

perror_plus("close");

1844

1772

}

1845

1773

1846

1774

if(ret_setflags == -1){

1847

errno = ioctl_errno;

1775

errno = ret_errno;

1848

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1849

1777

errno = old_errno;

1850

return ioctl_errno;

1778

return ret_errno;

1851

1779

}

1852

1780

} else if(debug){

1853

1781

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

1861

1789

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

1862

1790

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

1863

1791

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

1864

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

1792

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

1865

1793

.interfaces = NULL, .interfaces_size = 0 };

1866

1794

AvahiSServiceBrowser *sb = NULL;

1867

1795

error_t ret_errno;

1877

1805

const char *seckey = PATHDIR "/" SECKEY;

1878

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1879

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1880

1809

1881

1810

bool gnutls_initialized = false;

1882

1811

bool gpgme_initialized = false;

2060

1989

/* Work around Debian bug #633582:

2061

1990

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

2062

1991

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 {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2069

1994

struct stat st;

2070

1995

2071

1996

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

2111

2036

}

2112

2037

2113

2038

/* Lower privileges */

2114

ret_errno = lower_privileges();

2115

if(ret_errno != 0){

2116

errno = ret_errno;

2117

perror_plus("Failed to lower privileges");

2118

}

2039

lower_privileges();

2119

2040

}

2120

2041

}

2121

2042

2145

2066

goto end;

2146

2067

}

2147

2068

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);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2152

2077

}

2153

2078

2154

2079

if(not debug){

2242

2167

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

2243

2168

direntries[i]->d_name);

2244

2169

if(ret_errno != 0){

2245

errno = ret_errno;

2246

2170

perror_plus("argz_add");

2247

2171

continue;

2248

2172

}

2282

2206

break;

2283

2207

}

2284

2208

bool interface_was_up = interface_is_up(interface);

2285

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2286

2210

if(not interface_was_up){

2287

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2288

2213

perror_plus("Failed to bring up interface");

2289

2214

} 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

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2296

2218

}

2297

2219

}

2298

2220

}

2412

2334

sleep((unsigned int)retry_interval);

2413

2335

}

2414

2336

2415

if(not quit_now){

2337

if (not quit_now){

2416

2338

exitcode = EXIT_SUCCESS;

2417

2339

}

2418

2340

2520

2442

}

2521

2443

}

2522

2444

2523

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2524

2446

{

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

}

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2556

2472

}

2557

2473

2558

2474

free(interfaces_to_take_down);

2564

2480

struct dirent *direntry = NULL;

2565

2481

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

2566

2482

alphasort);

2567

if(numentries > 0){

2483

if (numentries > 0){

2568

2484

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

2569

2485

direntry = direntries[i];

2570

2486

char *fullname = NULL;

2585

2501

2586

2502

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

2587

2503

free(direntries);

2588

if(numentries == -1){

2504

if (numentries == -1){

2589

2505

perror_plus("scandir");

2590

2506

}

2591

2507

ret = rmdir(tempdir);