/mandos/release : revision 237.7.255

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

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

73

*/

74

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

75

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

76

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

77

78

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

78

79

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

79

80

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

141

142

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

142

143

char *connect_to = NULL;

143

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

144

146

uid_t uid = 65534;

145

147

gid_t gid = 65534;

146

148

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

216

219

}

217

220

218

221

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

222

__attribute__((nonnull, warn_unused_result))

219

223

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

220

224

int af, server **current_server){

221

225

int ret;

242

246

new_server->next = new_server;

243

247

new_server->prev = new_server;

244

248

*current_server = new_server;

245

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

246

249

} else {

250

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

247

251

new_server->next = *current_server;

248

252

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

249

253

new_server->prev->next = new_server;

255

259

/*

256

260

* Initialize GPGME.

257

261

*/

258

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

259

const char *tempdir, mandos_context *mc){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

260

267

gpgme_error_t rc;

261

268

gpgme_engine_info_t engine_info;

262

269

263

270

/*

264

271

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

265

272

*/

266

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

267

274

int ret;

268

275

int fd;

269

276

gpgme_data_t pgp_data;

350

357

* Decrypt OpenPGP data.

351

358

* Returns -1 on error

352

359

*/

360

__attribute__((nonnull, warn_unused_result))

353

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

362

size_t crypto_size,

355

363

char **plaintext,

475

483

return plaintext_length;

476

484

}

477

485

478

static const char * safer_gnutls_strerror(int value){

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

479

488

const char *ret = gnutls_strerror(value);

480

489

if(ret == NULL)

481

490

ret = "(unknown)";

483

492

}

484

493

485

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

486

496

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

487

497

const char* string){

488

498

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

489

499

}

490

500

501

__attribute__((nonnull, warn_unused_result))

491

502

static int init_gnutls_global(const char *pubkeyfilename,

492

503

const char *seckeyfilename,

493

504

mandos_context *mc){

567

578

return -1;

568

579

}

569

580

581

__attribute__((nonnull, warn_unused_result))

570

582

static int init_gnutls_session(gnutls_session_t *session,

571

583

mandos_context *mc){

572

584

int ret;

629

641

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

630

642

631

643

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

632

645

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

633

646

AvahiIfIndex if_index,

634

647

int af, mandos_context *mc){

740

753

goto mandos_end;

741

754

}

742

755

if(af == AF_INET6){

743

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

756

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

744

757

if(IN6_IS_ADDR_LINKLOCAL

745

758

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

746

759

if(if_index == AVAHI_IF_UNSPEC){

1030

1043

return retval;

1031

1044

}

1032

1045

1046

__attribute__((nonnull))

1033

1047

static void resolve_callback(AvahiSServiceResolver *r,

1034

1048

AvahiIfIndex interface,

1035

1049

AvahiProtocol proto,

1043

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1059

flags,

1046

void* mc){

1060

void *mc){

1047

1061

if(r == NULL){

1048

1062

return;

1049

1063

}

1102

1116

const char *domain,

1103

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1118

flags,

1105

void* mc){

1119

void *mc){

1106

1120

if(b == NULL){

1107

1121

return;

1108

1122

}

1168

1182

errno = old_errno;

1169

1183

}

1170

1184

1185

__attribute__((nonnull, warn_unused_result))

1171

1186

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

1172

1187

int ret;

1173

1188

error_t ret_errno;

1192

1207

return true;

1193

1208

}

1194

1209

1210

__attribute__((nonnull, warn_unused_result))

1195

1211

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

1196

1212

1197

1213

/* Reject the loopback device */

1239

1255

* corresponds to an acceptable network device.

1240

1256

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

1241

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1242

1259

int good_interface(const struct dirent *if_entry){

1243

1260

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

1244

1261

return 0;

1262

1279

/*

1263

1280

* This function determines if a network interface is up.

1264

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1265

1283

bool interface_is_up(const char *interface){

1266

1284

struct ifreq ifr;

1267

1285

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

1278

1296

/*

1279

1297

* This function determines if a network interface is running

1280

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1281

1300

bool interface_is_running(const char *interface){

1282

1301

struct ifreq ifr;

1283

1302

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

1291

1310

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

1292

1311

}

1293

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1294

1314

int notdotentries(const struct dirent *direntry){

1295

1315

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

1296

1316

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

1303

1323

}

1304

1324

1305

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1306

1327

int runnable_hook(const struct dirent *direntry){

1307

1328

int ret;

1308

1329

size_t sret;

1316

1337

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

1317

1338

"abcdefghijklmnopqrstuvwxyz"

1318

1339

"0123456789"

1319

"_-");

1340

"_.-");

1320

1341

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

1321

1342

/* Contains non-allowed characters */

1322

1343

if(debug){

1326

1347

return 0;

1327

1348

}

1328

1349

1329

char *fullname = NULL;

1330

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

1331

if(ret < 0){

1332

perror_plus("asprintf");

1333

return 0;

1334

}

1335

1336

ret = stat(fullname, &st);

1350

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1337

1351

if(ret == -1){

1338

1352

if(debug){

1339

1353

perror_plus("Could not stat hook");

1363

1377

return 1;

1364

1378

}

1365

1379

1380

__attribute__((nonnull, warn_unused_result))

1366

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

1382

mandos_context *mc){

1368

1383

int ret;

1437

1452

}

1438

1453

1439

1454

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

1455

__attribute__((warn_unused_result))

1440

1456

error_t raise_privileges(void){

1441

1457

error_t old_errno = errno;

1442

1458

error_t ret_errno = 0;

1443

1459

if(seteuid(0) == -1){

1444

1460

ret_errno = errno;

1445

perror_plus("seteuid");

1446

1461

}

1447

1462

errno = old_errno;

1448

1463

return ret_errno;

1449

1464

}

1450

1465

1451

1466

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

1467

__attribute__((warn_unused_result))

1452

1468

error_t raise_privileges_permanently(void){

1453

1469

error_t old_errno = errno;

1454

1470

error_t ret_errno = raise_privileges();

1458

1474

}

1459

1475

if(setuid(0) == -1){

1460

1476

ret_errno = errno;

1461

perror_plus("seteuid");

1462

1477

}

1463

1478

errno = old_errno;

1464

1479

return ret_errno;

1465

1480

}

1466

1481

1467

1482

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

1483

__attribute__((warn_unused_result))

1468

1484

error_t lower_privileges(void){

1469

1485

error_t old_errno = errno;

1470

1486

error_t ret_errno = 0;

1471

1487

if(seteuid(uid) == -1){

1472

1488

ret_errno = errno;

1473

perror_plus("seteuid");

1474

1489

}

1475

1490

errno = old_errno;

1476

1491

return ret_errno;

1477

1492

}

1478

1493

1479

1494

/* Lower privileges permanently */

1495

__attribute__((warn_unused_result))

1480

1496

error_t lower_privileges_permanently(void){

1481

1497

error_t old_errno = errno;

1482

1498

error_t ret_errno = 0;

1483

1499

if(setuid(uid) == -1){

1484

1500

ret_errno = errno;

1485

perror_plus("setuid");

1486

1501

}

1487

1502

errno = old_errno;

1488

1503

return ret_errno;

1489

1504

}

1490

1505

1491

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

1506

__attribute__((nonnull))

1507

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

1492

1508

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1509

struct dirent **direntries = NULL;

1510

if(hookdir_fd == -1){

1511

hookdir_fd = open(hookdir, O_RDONLY);

1512

if(hookdir_fd == -1){

1513

if(errno == ENOENT){

1514

if(debug){

1515

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1516

" found\n", hookdir);

1517

}

1518

} else {

1519

perror_plus("open");

1520

}

1521

return;

1522

}

1523

}

1524

#ifdef __GLIBC__

1525

#if __GLIBC_PREREQ(2, 15)

1526

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1527

runnable_hook, alphasort);

1528

#else /* not __GLIBC_PREREQ(2, 15) */

1529

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

1530

alphasort);

1531

#endif /* not __GLIBC_PREREQ(2, 15) */

1532

#else /* not __GLIBC__ */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC__ */

1496

1536

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");

1537

perror_plus("scandir");

1538

return;

1539

}

1540

struct dirent *direntry;

1541

int ret;

1542

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

1543

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

1544

direntry = direntries[i];

1545

if(debug){

1546

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

1547

direntry->d_name);

1504

1548

}

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){

1549

pid_t hook_pid = fork();

1550

if(hook_pid == 0){

1551

/* Child */

1552

/* Raise privileges */

1553

errno = raise_privileges_permanently();

1554

if(errno != 0){

1555

perror_plus("Failed to raise privileges");

1556

_exit(EX_NOPERM);

1557

}

1558

/* Set group */

1559

errno = 0;

1560

ret = setgid(0);

1561

if(ret == -1){

1562

perror_plus("setgid");

1563

_exit(EX_NOPERM);

1564

}

1565

/* Reset supplementary groups */

1566

errno = 0;

1567

ret = setgroups(0, NULL);

1568

if(ret == -1){

1569

perror_plus("setgroups");

1570

_exit(EX_NOPERM);

1571

}

1572

ret = dup2(devnull, STDIN_FILENO);

1573

if(ret == -1){

1574

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

1575

_exit(EX_OSERR);

1576

}

1577

ret = close(devnull);

1578

if(ret == -1){

1579

perror_plus("close");

1580

_exit(EX_OSERR);

1581

}

1582

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("setenv");

1590

_exit(EX_OSERR);

1591

}

1592

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

1593

if(ret == -1){

1594

perror_plus("setenv");

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

char *delaystring;

1608

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

1609

if(ret == -1){

1514

1610

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

}

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1573

1615

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

}

1616

perror_plus("setenv");

1617

_exit(EX_OSERR);

1618

}

1619

free(delaystring);

1620

if(connect_to != NULL){

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

_exit(EX_OSERR);

1625

}

1626

}

1627

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1628

if(hook_fd == -1){

1629

perror_plus("openat");

1630

_exit(EXIT_FAILURE);

1631

}

1632

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

1633

perror_plus("close");

1634

_exit(EXIT_FAILURE);

1635

}

1636

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1637

environ) == -1){

1638

perror_plus("fexecve");

1639

_exit(EXIT_FAILURE);

1640

}

1641

} else {

1642

int status;

1643

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

1644

perror_plus("waitpid");

1645

continue;

1646

}

1647

if(WIFEXITED(status)){

1648

if(WEXITSTATUS(status) != 0){

1649

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

1650

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

1651

WEXITSTATUS(status));

1652

continue;

1653

}

1654

} else if(WIFSIGNALED(status)){

1655

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

1656

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

1657

WTERMSIG(status));

1658

continue;

1585

1659

} 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;

1660

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

1661

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

1662

continue;

1663

}

1664

}

1665

if(debug){

1666

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

1667

direntry->d_name);

1668

}

1669

}

1670

free(direntries);

1671

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

1672

perror_plus("close");

1673

} else {

1674

hookdir_fd = -1;

1675

}

1676

close(devnull);

1622

1677

}

1623

1678

1679

__attribute__((nonnull, warn_unused_result))

1624

1680

error_t bring_up_interface(const char *const interface,

1625

1681

const float delay){

1626

int sd = -1;

1627

1682

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1683

int ret;

1630

1684

struct ifreq network;

1631

1685

unsigned int if_index = if_nametoindex(interface);

1632

1686

if(if_index == 0){

1641

1695

}

1642

1696

1643

1697

if(not interface_is_up(interface)){

1644

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

1698

error_t ret_errno = 0, ioctl_errno = 0;

1699

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

1645

1700

ret_errno = errno;

1646

1701

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

1647

1702

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

1703

errno = old_errno;

1648

1704

return ret_errno;

1649

1705

}

1650

network.ifr_flags |= IFF_UP;

1706

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

1651

1707

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1708

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

1709

if(sd == -1){

1654

1710

ret_errno = errno;

1655

1711

perror_plus("socket");

1656

1712

errno = old_errno;

1657

1713

return ret_errno;

1658

1714

}

1659

1715

1660

1716

if(quit_now){

1661

close(sd);

1717

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

1718

if(ret == -1){

1719

perror_plus("close");

1720

}

1662

1721

errno = old_errno;

1663

1722

return EINTR;

1664

1723

}

1668

1727

interface);

1669

1728

}

1670

1729

1671

/* Raise priviliges */

1672

raise_privileges();

1730

/* Raise privileges */

1731

ret_errno = raise_privileges();

1732

if(ret_errno != 0){

1733

errno = ret_errno;

1734

perror_plus("Failed to raise privileges");

1735

}

1673

1736

1674

1737

#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");

1738

int ret_linux;

1739

bool restore_loglevel = false;

1740

if(ret_errno == 0){

1741

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1742

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

1743

ret_linux = klogctl(8, NULL, 5);

1744

if(ret_linux == -1){

1745

perror_plus("klogctl");

1746

} else {

1747

restore_loglevel = true;

1748

}

1682

1749

}

1683

1750

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1751

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

1752

ioctl_errno = errno;

1686

1753

#ifdef __linux__

1687

1754

if(restore_loglevel){

1688

1755

ret_linux = klogctl(7, NULL, 0);

1692

1759

}

1693

1760

#endif /* __linux__ */

1694

1761

1695

/* Lower privileges */

1696

lower_privileges();

1762

/* If raise_privileges() succeeded above */

1763

if(ret_errno == 0){

1764

/* Lower privileges */

1765

ret_errno = lower_privileges();

1766

if(ret_errno != 0){

1767

errno = ret_errno;

1768

perror_plus("Failed to lower privileges");

1769

}

1770

}

1697

1771

1698

1772

/* Close the socket */

1699

1773

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

1702

1776

}

1703

1777

1704

1778

if(ret_setflags == -1){

1705

errno = ret_errno;

1779

errno = ioctl_errno;

1706

1780

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

1781

errno = old_errno;

1708

return ret_errno;

1782

return ioctl_errno;

1709

1783

}

1710

1784

} else if(debug){

1711

1785

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

1729

1803

return 0;

1730

1804

}

1731

1805

1806

__attribute__((nonnull, warn_unused_result))

1732

1807

error_t take_down_interface(const char *const interface){

1733

1808

error_t old_errno = errno;

1734

1809

struct ifreq network;

1739

1814

return ENXIO;

1740

1815

}

1741

1816

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1817

error_t ret_errno = 0, ioctl_errno = 0;

1743

1818

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

1744

1819

ret_errno = errno;

1745

1820

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

1746

1821

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

1822

errno = old_errno;

1747

1823

return ret_errno;

1748

1824

}

1749

1825

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

1750

1826

1751

1827

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

1752

if(sd < 0){

1828

if(sd == -1){

1753

1829

ret_errno = errno;

1754

1830

perror_plus("socket");

1755

1831

errno = old_errno;

1761

1837

interface);

1762

1838

}

1763

1839

1764

/* Raise priviliges */

1765

raise_privileges();

1840

/* Raise privileges */

1841

ret_errno = raise_privileges();

1842

if(ret_errno != 0){

1843

errno = ret_errno;

1844

perror_plus("Failed to raise privileges");

1845

}

1766

1846

1767

1847

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

1768

ret_errno = errno;

1848

ioctl_errno = errno;

1769

1849

1770

/* Lower privileges */

1771

lower_privileges();

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1772

1859

1773

1860

/* Close the socket */

1774

1861

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

1777

1864

}

1778

1865

1779

1866

if(ret_setflags == -1){

1780

errno = ret_errno;

1867

errno = ioctl_errno;

1781

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

1869

errno = old_errno;

1783

return ret_errno;

1870

return ioctl_errno;

1784

1871

}

1785

1872

} else if(debug){

1786

1873

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

1794

1881

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

1795

1882

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

1796

1883

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

1797

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

1884

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

1798

1885

.interfaces = NULL, .interfaces_size = 0 };

1799

1886

AvahiSServiceBrowser *sb = NULL;

1800

1887

error_t ret_errno;

1804

1891

int exitcode = EXIT_SUCCESS;

1805

1892

char *interfaces_to_take_down = NULL;

1806

1893

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

1894

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

1895

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

1896

char *tempdir = NULL;

1809

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1898

const char *seckey = PATHDIR "/" SECKEY;

1811

1899

const char *pubkey = PATHDIR "/" PUBKEY;

1993

2081

/* Work around Debian bug #633582:

1994

2082

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

1995

2083

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

1998

2090

struct stat st;

1999

2091

2000

2092

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

2040

2132

}

2041

2133

2042

2134

/* Lower privileges */

2043

lower_privileges();

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2044

2140

}

2045

2141

}

2046

2142

2072

2168

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

2073

2169

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

2074

2170

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

2079

2173

}

2080

2174

2081

2175

if(not debug){

2159

2253

2160

2254

/* If no interfaces were specified, make a list */

2161

2255

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2256

struct dirent **direntries = NULL;

2163

2257

/* Look for any good interfaces */

2164

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2165

2259

alphasort);

2180

2274

}

2181

2275

free(direntries);

2182

2276

} else {

2183

free(direntries);

2277

if(ret == 0){

2278

free(direntries);

2279

}

2184

2280

fprintf_plus(stderr, "Could not find a network interface\n");

2185

2281

exitcode = EXIT_FAILURE;

2186

2282

goto end;

2209

2305

break;

2210

2306

}

2211

2307

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2308

errno = bring_up_interface(interface, delay);

2213

2309

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2310

if(errno != 0){

2216

2311

perror_plus("Failed to bring up interface");

2217

2312

} 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;

2313

errno = argz_add(&interfaces_to_take_down,

2314

&interfaces_to_take_down_size,

2315

interface);

2316

if(errno != 0){

2223

2317

perror_plus("argz_add");

2224

2318

}

2225

2319

}

2256

2350

goto end;

2257

2351

}

2258

2352

2259

if(mkdtemp(tempdir) == NULL){

2353

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

2354

tempdir = mkdtemp(run_tempdir);

2355

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

2356

if(debug){

2357

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

2358

run_tempdir, old_tempdir);

2359

}

2360

tempdir = mkdtemp(old_tempdir);

2361

}

2362

if(tempdir == NULL){

2260

2363

perror_plus("mkdtemp");

2261

2364

goto end;

2262

2365

}

2263

tempdir_created = true;

2264

2366

2265

2367

if(quit_now){

2266

2368

goto end;

2402

2504

if(debug){

2403

2505

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

2404

2506

}

2405

2507

2406

2508

ret = avahi_loop_with_timeout(simple_poll,

2407

2509

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

2408

2510

if(debug){

2449

2551

}

2450

2552

}

2451

2553

2452

/* Re-raise priviliges */

2554

/* Re-raise privileges */

2453

2555

{

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();

2556

ret_errno = raise_privileges();

2557

if(ret_errno != 0){

2558

errno = ret_errno;

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2583

}

2584

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2589

}

2479

2590

}

2480

2591

2481

2592

free(interfaces_to_take_down);

2482

2593

free(interfaces_hooks);

2483

2594

2484

2595

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

2485

if(tempdir_created){

2596

if(tempdir != NULL){

2486

2597

struct dirent **direntries = NULL;

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if(numentries > 0){

2491

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

2492

direntry = direntries[i];

2493

char *fullname = NULL;

2494

ret = asprintf(&fullname, "%s/%s", tempdir,

2495

direntry->d_name);

2496

if(ret < 0){

2497

perror_plus("asprintf");

2498

continue;

2499

}

2500

ret = remove(fullname);

2501

if(ret == -1){

2502

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2503

strerror(errno));

2504

}

2505

free(fullname);

2598

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2599

O_NOFOLLOW));

2600

if(tempdir_fd == -1){

2601

perror_plus("open");

2602

} else {

2603

#ifdef __GLIBC__

2604

#if __GLIBC_PREREQ(2, 15)

2605

int numentries = scandirat(tempdir_fd, ".", &direntries,

2606

notdotentries, alphasort);

2607

#else /* not __GLIBC_PREREQ(2, 15) */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC_PREREQ(2, 15) */

2611

#else /* not __GLIBC__ */

2612

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

2613

alphasort);

2614

#endif /* not __GLIBC__ */

2615

if(numentries >= 0){

2616

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

2617

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2618

if(ret == -1){

2619

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2620

" \"%s\", 0): %s\n", tempdir,

2621

direntries[i]->d_name, strerror(errno));

2622

}

2623

}

2624

2625

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

2626

free(direntries);

2627

if(numentries == -1){

2628

perror_plus("scandir");

2629

}

2630

ret = rmdir(tempdir);

2631

if(ret == -1 and errno != ENOENT){

2632

perror_plus("rmdir");

2633

}

2506

2634

}

2507

}

2508

2509

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

2510

free(direntries);

2511

if(numentries == -1){

2512

perror_plus("scandir");

2513

}

2514

ret = rmdir(tempdir);

2515

if(ret == -1 and errno != ENOENT){

2516

perror_plus("rmdir");

2635

TEMP_FAILURE_RETRY(close(tempdir_fd));

2517

2636

}

2518

2637

}

2519

2638