/mandos/trunk : revision 679

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() */

133

136

134

137

bool debug = false;

135

138

static const char mandos_protocol_version[] = "1";

136

const char *argp_program_version = "mandos-client " VERSION;

137

const char *argp_program_bug_address = "<mandos@recompile.se>";

139

const char * argp_program_version = "mandos-client " VERSION;

140

const char * argp_program_bug_address = "<mandos@recompile.se>";

138

141

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

139

142

char *connect_to = NULL;

140

143

const char *hookdir = HOOKDIR;

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

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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;

1365

1382

return 1;

1366

1383

}

1367

1384

1385

__attribute__((nonnull, warn_unused_result))

1368

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1369

1387

mandos_context *mc){

1370

1388

int ret;

1374

1392

1375

1393

while(true){

1376

1394

if(mc->current_server == NULL){

1377

if (debug){

1395

if(debug){

1378

1396

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

1379

1397

" No timeout!\n");

1380

1398

}

1381

1399

ret = avahi_simple_poll_iterate(s, -1);

1382

1400

} else {

1383

if (debug){

1401

if(debug){

1384

1402

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

1385

1403

" it, or wait\n");

1386

1404

}

1403

1421

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

1404

1422

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

1405

1423

1406

if (debug){

1424

if(debug){

1407

1425

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

1408

1426

block_time);

1409

1427

}

1431

1449

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

1432

1450

}

1433

1451

if(ret != 0){

1434

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

1452

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

1435

1453

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

1436

1454

}

1437

1455

}

1439

1457

}

1440

1458

1441

1459

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

1460

__attribute__((warn_unused_result))

1442

1461

error_t raise_privileges(void){

1443

1462

error_t old_errno = errno;

1444

1463

error_t ret_errno = 0;

1451

1470

}

1452

1471

1453

1472

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

1473

__attribute__((warn_unused_result))

1454

1474

error_t raise_privileges_permanently(void){

1455

1475

error_t old_errno = errno;

1456

1476

error_t ret_errno = raise_privileges();

1467

1487

}

1468

1488

1469

1489

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

1490

__attribute__((warn_unused_result))

1470

1491

error_t lower_privileges(void){

1471

1492

error_t old_errno = errno;

1472

1493

error_t ret_errno = 0;

1479

1500

}

1480

1501

1481

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1482

1504

error_t lower_privileges_permanently(void){

1483

1505

error_t old_errno = errno;

1484

1506

error_t ret_errno = 0;

1490

1512

return ret_errno;

1491

1513

}

1492

1514

1493

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

1515

__attribute__((nonnull))

1516

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

1494

1517

const float delay){

1495

1518

struct dirent **direntries;

1496

1519

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

1524

1547

if(hook_pid == 0){

1525

1548

/* Child */

1526

1549

/* Raise privileges */

1527

raise_privileges_permanently();

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1528

1554

/* Set group */

1529

1555

errno = 0;

1530

1556

ret = setgid(0);

1531

1557

if(ret == -1){

1532

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1533

1560

}

1534

1561

/* Reset supplementary groups */

1535

1562

errno = 0;

1536

1563

ret = setgroups(0, NULL);

1537

1564

if(ret == -1){

1538

1565

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1543

1583

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

1544

1584

if(ret == -1){

1545

1585

perror_plus("setenv");

1561

1601

_exit(EX_OSERR);

1562

1602

}

1563

1603

char *delaystring;

1564

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

1604

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

1565

1605

if(ret == -1){

1566

1606

perror_plus("asprintf");

1567

1607

_exit(EX_OSERR);

1620

1660

}

1621

1661

close(devnull);

1622

1662

}

1623

return true;

1624

1663

}

1625

1664

1665

__attribute__((nonnull, warn_unused_result))

1626

1666

error_t bring_up_interface(const char *const interface,

1627

1667

const float delay){

1628

int sd = -1;

1629

1668

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

1669

int ret;

1632

1670

struct ifreq network;

1633

1671

unsigned int if_index = if_nametoindex(interface);

1634

1672

if(if_index == 0){

1643

1681

}

1644

1682

1645

1683

if(not interface_is_up(interface)){

1646

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

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1647

1686

ret_errno = errno;

1648

1687

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

1649

1688

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

1689

errno = old_errno;

1650

1690

return ret_errno;

1651

1691

}

1652

network.ifr_flags |= IFF_UP;

1692

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

1653

1693

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

1694

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

1695

if(sd == -1){

1656

1696

ret_errno = errno;

1657

1697

perror_plus("socket");

1658

1698

errno = old_errno;

1659

1699

return ret_errno;

1660

1700

}

1661

1701

1662

1702

if(quit_now){

1663

close(sd);

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1664

1707

errno = old_errno;

1665

1708

return EINTR;

1666

1709

}

1670

1713

interface);

1671

1714

}

1672

1715

1673

/* Raise priviliges */

1674

raise_privileges();

1675

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1676

1722

#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");

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1684

1733

}

1685

1734

#endif /* __linux__ */

1686

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

1687

ret_errno = errno;

1735

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

1736

ioctl_errno = errno;

1688

1737

#ifdef __linux__

1689

1738

if(restore_loglevel){

1690

1739

ret_linux = klogctl(7, NULL, 0);

1694

1743

}

1695

1744

#endif /* __linux__ */

1696

1745

1697

/* Lower privileges */

1698

lower_privileges();

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1699

1755

1700

1756

/* Close the socket */

1701

1757

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

1704

1760

}

1705

1761

1706

1762

if(ret_setflags == -1){

1707

errno = ret_errno;

1763

errno = ioctl_errno;

1708

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1709

1765

errno = old_errno;

1710

return ret_errno;

1766

return ioctl_errno;

1711

1767

}

1712

1768

} else if(debug){

1713

1769

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

1731

1787

return 0;

1732

1788

}

1733

1789

1790

__attribute__((nonnull, warn_unused_result))

1734

1791

error_t take_down_interface(const char *const interface){

1735

1792

error_t old_errno = errno;

1736

1793

struct ifreq network;

1741

1798

return ENXIO;

1742

1799

}

1743

1800

if(interface_is_up(interface)){

1744

error_t ret_errno = 0;

1801

error_t ret_errno = 0, ioctl_errno = 0;

1745

1802

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

1746

1803

ret_errno = errno;

1747

1804

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

1748

1805

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

1806

errno = old_errno;

1749

1807

return ret_errno;

1750

1808

}

1751

1809

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

1752

1810

1753

1811

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

1754

if(sd < 0){

1812

if(sd == -1){

1755

1813

ret_errno = errno;

1756

1814

perror_plus("socket");

1757

1815

errno = old_errno;

1763

1821

interface);

1764

1822

}

1765

1823

1766

/* Raise priviliges */

1767

raise_privileges();

1768

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1769

1829

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

1770

ret_errno = errno;

1830

ioctl_errno = errno;

1771

1831

1772

/* Lower privileges */

1773

lower_privileges();

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1774

1841

1775

1842

/* Close the socket */

1776

1843

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

1779

1846

}

1780

1847

1781

1848

if(ret_setflags == -1){

1782

errno = ret_errno;

1849

errno = ioctl_errno;

1783

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1784

1851

errno = old_errno;

1785

return ret_errno;

1852

return ioctl_errno;

1786

1853

}

1787

1854

} else if(debug){

1788

1855

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

1796

1863

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

1797

1864

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

1798

1865

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

1799

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

1866

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

1800

1867

.interfaces = NULL, .interfaces_size = 0 };

1801

1868

AvahiSServiceBrowser *sb = NULL;

1802

1869

error_t ret_errno;

1806

1873

int exitcode = EXIT_SUCCESS;

1807

1874

char *interfaces_to_take_down = NULL;

1808

1875

size_t interfaces_to_take_down_size = 0;

1809

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

1810

bool tempdir_created = false;

1876

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

1877

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

1878

char *tempdir = NULL;

1811

1879

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1812

1880

const char *seckey = PATHDIR "/" SECKEY;

1813

1881

const char *pubkey = PATHDIR "/" PUBKEY;

1995

2063

/* Work around Debian bug #633582:

1996

2064

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

1997

2065

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

2071

} else {

2000

2072

struct stat st;

2001

2073

2002

2074

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

2042

2114

}

2043

2115

2044

2116

/* Lower privileges */

2045

lower_privileges();

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

2121

}

2046

2122

}

2047

2123

}

2048

2124

2074

2150

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

2075

2151

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

2076

2152

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

2081

2155

}

2082

2156

2083

2157

if(not debug){

2211

2285

break;

2212

2286

}

2213

2287

bool interface_was_up = interface_is_up(interface);

2214

ret = bring_up_interface(interface, delay);

2288

errno = bring_up_interface(interface, delay);

2215

2289

if(not interface_was_up){

2216

if(ret != 0){

2217

errno = ret;

2290

if(errno != 0){

2218

2291

perror_plus("Failed to bring up interface");

2219

2292

} 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;

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2225

2297

perror_plus("argz_add");

2226

2298

}

2227

2299

}

2258

2330

goto end;

2259

2331

}

2260

2332

2261

if(mkdtemp(tempdir) == NULL){

2333

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

2334

tempdir = mkdtemp(run_tempdir);

2335

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

2336

if(debug){

2337

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

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

2262

2343

perror_plus("mkdtemp");

2263

2344

goto end;

2264

2345

}

2265

tempdir_created = true;

2266

2346

2267

2347

if(quit_now){

2268

2348

goto end;

2343

2423

sleep((unsigned int)retry_interval);

2344

2424

}

2345

2425

2346

if (not quit_now){

2426

if(not quit_now){

2347

2427

exitcode = EXIT_SUCCESS;

2348

2428

}

2349

2429

2451

2531

}

2452

2532

}

2453

2533

2454

/* Re-raise priviliges */

2534

/* Re-raise privileges */

2455

2535

{

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();

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2562

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2566

}

2481

2567

}

2482

2568

2483

2569

free(interfaces_to_take_down);

2484

2570

free(interfaces_hooks);

2485

2571

2486

2572

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

2487

if(tempdir_created){

2573

if(tempdir != NULL){

2488

2574

struct dirent **direntries = NULL;

2489

2575

struct dirent *direntry = NULL;

2490

2576

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

2491

2577

alphasort);

2492

if (numentries > 0){

2578

if(numentries > 0){

2493

2579

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

2494

2580

direntry = direntries[i];

2495

2581

char *fullname = NULL;

2510

2596

2511

2597

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

2512

2598

free(direntries);

2513

if (numentries == -1){

2599

if(numentries == -1){

2514

2600

perror_plus("scandir");

2515

2601

}

2516

2602

ret = rmdir(tempdir);