/mandos/release : revision 237.7.252

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){

809

822

sizeof(struct sockaddr_in));

810

823

}

811

824

if(ret < 0){

812

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

825

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

813

826

int e = errno;

814

827

perror_plus("connect");

815

828

errno = e;

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;

1372

1387

1373

1388

while(true){

1374

1389

if(mc->current_server == NULL){

1375

if (debug){

1390

if(debug){

1376

1391

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

1377

1392

" No timeout!\n");

1378

1393

}

1379

1394

ret = avahi_simple_poll_iterate(s, -1);

1380

1395

} else {

1381

if (debug){

1396

if(debug){

1382

1397

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

1383

1398

" it, or wait\n");

1384

1399

}

1401

1416

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

1402

1417

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

1403

1418

1404

if (debug){

1419

if(debug){

1405

1420

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

1406

1421

block_time);

1407

1422

}

1429

1444

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

1430

1445

}

1431

1446

if(ret != 0){

1432

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

1447

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

1433

1448

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

1434

1449

}

1435

1450

}

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;

1449

1465

}

1450

1466

1451

1467

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

1468

__attribute__((warn_unused_result))

1452

1469

error_t raise_privileges_permanently(void){

1453

1470

error_t old_errno = errno;

1454

1471

error_t ret_errno = raise_privileges();

1465

1482

}

1466

1483

1467

1484

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

1485

__attribute__((warn_unused_result))

1468

1486

error_t lower_privileges(void){

1469

1487

error_t old_errno = errno;

1470

1488

error_t ret_errno = 0;

1477

1495

}

1478

1496

1479

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1480

1499

error_t lower_privileges_permanently(void){

1481

1500

error_t old_errno = errno;

1482

1501

error_t ret_errno = 0;

1488

1507

return ret_errno;

1489

1508

}

1490

1509

1491

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

1510

__attribute__((nonnull))

1511

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

1492

1512

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1513

struct dirent **direntries = NULL;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1496

1540

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");

1541

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1504

1552

}

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){

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1514

1613

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

}

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1573

1618

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

}

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1585

1662

} 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;

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1622

1680

}

1623

1681

1682

__attribute__((nonnull, warn_unused_result))

1624

1683

error_t bring_up_interface(const char *const interface,

1625

1684

const float delay){

1626

int sd = -1;

1627

1685

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1686

int ret;

1630

1687

struct ifreq network;

1631

1688

unsigned int if_index = if_nametoindex(interface);

1632

1689

if(if_index == 0){

1641

1698

}

1642

1699

1643

1700

if(not interface_is_up(interface)){

1644

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

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1645

1703

ret_errno = errno;

1646

1704

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

1647

1705

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

1706

errno = old_errno;

1648

1707

return ret_errno;

1649

1708

}

1650

network.ifr_flags |= IFF_UP;

1709

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

1651

1710

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1711

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

1712

if(sd == -1){

1654

1713

ret_errno = errno;

1655

1714

perror_plus("socket");

1656

1715

errno = old_errno;

1657

1716

return ret_errno;

1658

1717

}

1659

1718

1660

1719

if(quit_now){

1661

close(sd);

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1662

1724

errno = old_errno;

1663

1725

return EINTR;

1664

1726

}

1668

1730

interface);

1669

1731

}

1670

1732

1671

/* Raise priviliges */

1672

raise_privileges();

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

perror_plus("Failed to raise privileges");

1737

}

1673

1738

1674

1739

#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");

1740

int ret_linux;

1741

bool restore_loglevel = false;

1742

if(ret_errno == 0){

1743

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1744

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

1745

ret_linux = klogctl(8, NULL, 5);

1746

if(ret_linux == -1){

1747

perror_plus("klogctl");

1748

} else {

1749

restore_loglevel = true;

1750

}

1682

1751

}

1683

1752

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1753

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

1754

ioctl_errno = errno;

1686

1755

#ifdef __linux__

1687

1756

if(restore_loglevel){

1688

1757

ret_linux = klogctl(7, NULL, 0);

1692

1761

}

1693

1762

#endif /* __linux__ */

1694

1763

1695

/* Lower privileges */

1696

lower_privileges();

1764

/* If raise_privileges() succeeded above */

1765

if(ret_errno == 0){

1766

/* Lower privileges */

1767

ret_errno = lower_privileges();

1768

if(ret_errno != 0){

1769

errno = ret_errno;

1770

perror_plus("Failed to lower privileges");

1771

}

1772

}

1697

1773

1698

1774

/* Close the socket */

1699

1775

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

1702

1778

}

1703

1779

1704

1780

if(ret_setflags == -1){

1705

errno = ret_errno;

1781

errno = ioctl_errno;

1706

1782

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

1783

errno = old_errno;

1708

return ret_errno;

1784

return ioctl_errno;

1709

1785

}

1710

1786

} else if(debug){

1711

1787

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

1729

1805

return 0;

1730

1806

}

1731

1807

1808

__attribute__((nonnull, warn_unused_result))

1732

1809

error_t take_down_interface(const char *const interface){

1733

1810

error_t old_errno = errno;

1734

1811

struct ifreq network;

1739

1816

return ENXIO;

1740

1817

}

1741

1818

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1819

error_t ret_errno = 0, ioctl_errno = 0;

1743

1820

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

1744

1821

ret_errno = errno;

1745

1822

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

1746

1823

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

1824

errno = old_errno;

1747

1825

return ret_errno;

1748

1826

}

1749

1827

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

1750

1828

1751

1829

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

1752

if(sd < 0){

1830

if(sd == -1){

1753

1831

ret_errno = errno;

1754

1832

perror_plus("socket");

1755

1833

errno = old_errno;

1761

1839

interface);

1762

1840

}

1763

1841

1764

/* Raise priviliges */

1765

raise_privileges();

1842

/* Raise privileges */

1843

ret_errno = raise_privileges();

1844

if(ret_errno != 0){

1845

perror_plus("Failed to raise privileges");

1846

}

1766

1847

1767

1848

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

1768

ret_errno = errno;

1849

ioctl_errno = errno;

1769

1850

1770

/* Lower privileges */

1771

lower_privileges();

1851

/* If raise_privileges() succeeded above */

1852

if(ret_errno == 0){

1853

/* Lower privileges */

1854

ret_errno = lower_privileges();

1855

if(ret_errno != 0){

1856

errno = ret_errno;

1857

perror_plus("Failed to lower privileges");

1858

}

1859

}

1772

1860

1773

1861

/* Close the socket */

1774

1862

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

1777

1865

}

1778

1866

1779

1867

if(ret_setflags == -1){

1780

errno = ret_errno;

1868

errno = ioctl_errno;

1781

1869

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

1870

errno = old_errno;

1783

return ret_errno;

1871

return ioctl_errno;

1784

1872

}

1785

1873

} else if(debug){

1786

1874

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

1794

1882

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

1795

1883

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

1796

1884

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

1797

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

1885

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

1798

1886

.interfaces = NULL, .interfaces_size = 0 };

1799

1887

AvahiSServiceBrowser *sb = NULL;

1800

1888

error_t ret_errno;

1804

1892

int exitcode = EXIT_SUCCESS;

1805

1893

char *interfaces_to_take_down = NULL;

1806

1894

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

1895

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

1896

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

1897

char *tempdir = NULL;

1809

1898

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1899

const char *seckey = PATHDIR "/" SECKEY;

1811

1900

const char *pubkey = PATHDIR "/" PUBKEY;

1993

2082

/* Work around Debian bug #633582:

1994

2083

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

1995

2084

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2085

/* Re-raise privileges */

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2089

perror_plus("Failed to raise privileges");

2090

} else {

1998

2091

struct stat st;

1999

2092

2000

2093

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

2040

2133

}

2041

2134

2042

2135

/* Lower privileges */

2043

lower_privileges();

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2139

perror_plus("Failed to lower privileges");

2140

}

2044

2141

}

2045

2142

}

2046

2143

2072

2169

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

2073

2170

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

2074

2171

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2172

run_network_hooks("start", interfaces_hooks != NULL ?

2173

interfaces_hooks : "", delay);

2079

2174

}

2080

2175

2081

2176

if(not debug){

2159

2254

2160

2255

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

2161

2256

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2257

struct dirent **direntries = NULL;

2163

2258

/* Look for any good interfaces */

2164

2259

ret = scandir(sys_class_net, &direntries, good_interface,

2165

2260

alphasort);

2180

2275

}

2181

2276

free(direntries);

2182

2277

} else {

2183

free(direntries);

2278

if(ret == 0){

2279

free(direntries);

2280

}

2184

2281

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

2185

2282

exitcode = EXIT_FAILURE;

2186

2283

goto end;

2209

2306

break;

2210

2307

}

2211

2308

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2309

errno = bring_up_interface(interface, delay);

2213

2310

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2311

if(errno != 0){

2216

2312

perror_plus("Failed to bring up interface");

2217

2313

} 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;

2314

errno = argz_add(&interfaces_to_take_down,

2315

&interfaces_to_take_down_size,

2316

interface);

2317

if(errno != 0){

2223

2318

perror_plus("argz_add");

2224

2319

}

2225

2320

}

2256

2351

goto end;

2257

2352

}

2258

2353

2259

if(mkdtemp(tempdir) == NULL){

2354

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

2355

tempdir = mkdtemp(run_tempdir);

2356

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

2357

if(debug){

2358

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

2359

run_tempdir, old_tempdir);

2360

}

2361

tempdir = mkdtemp(old_tempdir);

2362

}

2363

if(tempdir == NULL){

2260

2364

perror_plus("mkdtemp");

2261

2365

goto end;

2262

2366

}

2263

tempdir_created = true;

2264

2367

2265

2368

if(quit_now){

2266

2369

goto end;

2341

2444

sleep((unsigned int)retry_interval);

2342

2445

}

2343

2446

2344

if (not quit_now){

2447

if(not quit_now){

2345

2448

exitcode = EXIT_SUCCESS;

2346

2449

}

2347

2450

2402

2505

if(debug){

2403

2506

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

2404

2507

}

2405

2508

2406

2509

ret = avahi_loop_with_timeout(simple_poll,

2407

2510

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

2408

2511

if(debug){

2449

2552

}

2450

2553

}

2451

2554

2452

/* Re-raise priviliges */

2555

/* Re-raise privileges */

2453

2556

{

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();

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

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

perror_plus("Failed to lower privileges permanently");

2588

}

2479

2589

}

2480

2590

2481

2591

free(interfaces_to_take_down);

2482

2592

free(interfaces_hooks);

2483

2593

2484

2594

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

2485

if(tempdir_created){

2595

if(tempdir != NULL){

2486

2596

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);

2597

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

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

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

2605

notdotentries, alphasort);

2606

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

2607

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

2608

alphasort);

2609

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

2610

#else /* not __GLIBC__ */

2611

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

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

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

2616

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

2617

if(ret == -1){

2618

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

2619

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

2620

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

2621

}

2622

}

2623

2624

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

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

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

2631

perror_plus("rmdir");

2632

}

2506

2633

}

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");

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

2517

2635

}

2518

2636

}

2519

2637