/mandos/trunk : revision 671

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 /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

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(), unlinkat() */

60

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

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(),

77

unlinkat() */

76

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

78

77

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

79

78

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

80

79

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

142

141

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

143

142

char *connect_to = NULL;

144

143

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

144

uid_t uid = 65534;

147

145

gid_t gid = 65534;

148

146

185

183

perror(print_text);

186

184

}

187

185

188

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

186

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

189

187

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

190

188

va_list ap;

191

189

va_start (ap, format);

200

198

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

201

199

* "buffer_length" is how much is already used.

202

200

*/

203

__attribute__((nonnull, warn_unused_result))

204

201

size_t incbuffer(char **buffer, size_t buffer_length,

205

202

size_t buffer_capacity){

206

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

219

216

}

220

217

221

218

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

222

__attribute__((nonnull, warn_unused_result))

223

219

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

224

220

int af, server **current_server){

225

221

int ret;

246

242

new_server->next = new_server;

247

243

new_server->prev = new_server;

248

244

*current_server = new_server;

245

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

249

246

} else {

250

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

251

247

new_server->next = *current_server;

252

248

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

253

249

new_server->prev->next = new_server;

259

255

/*

260

256

* Initialize GPGME.

261

257

*/

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){

258

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

259

const char *tempdir, mandos_context *mc){

267

260

gpgme_error_t rc;

268

261

gpgme_engine_info_t engine_info;

269

262

270

263

/*

271

264

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

272

265

*/

273

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

274

267

int ret;

275

268

int fd;

276

269

gpgme_data_t pgp_data;

357

350

* Decrypt OpenPGP data.

358

351

* Returns -1 on error

359

352

*/

360

__attribute__((nonnull, warn_unused_result))

361

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

354

size_t crypto_size,

363

355

char **plaintext,

483

475

return plaintext_length;

484

476

}

485

477

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

488

479

const char *ret = gnutls_strerror(value);

489

480

if(ret == NULL)

490

481

ret = "(unknown)";

492

483

}

493

484

494

485

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

486

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

497

487

const char* string){

498

488

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

499

489

}

500

490

501

__attribute__((nonnull, warn_unused_result))

502

491

static int init_gnutls_global(const char *pubkeyfilename,

503

492

const char *seckeyfilename,

504

493

mandos_context *mc){

578

567

return -1;

579

568

}

580

569

581

__attribute__((nonnull, warn_unused_result))

582

570

static int init_gnutls_session(gnutls_session_t *session,

583

571

mandos_context *mc){

584

572

int ret;

641

629

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

642

630

643

631

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

632

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

646

633

AvahiIfIndex if_index,

647

634

int af, mandos_context *mc){

753

740

goto mandos_end;

754

741

}

755

742

if(af == AF_INET6){

756

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

743

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

757

744

if(IN6_IS_ADDR_LINKLOCAL

758

745

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

759

746

if(if_index == AVAHI_IF_UNSPEC){

1043

1030

return retval;

1044

1031

}

1045

1032

1046

__attribute__((nonnull))

1047

1033

static void resolve_callback(AvahiSServiceResolver *r,

1048

1034

AvahiIfIndex interface,

1049

1035

AvahiProtocol proto,

1057

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1045

flags,

1060

void *mc){

1046

void* mc){

1061

1047

if(r == NULL){

1062

1048

return;

1063

1049

}

1116

1102

const char *domain,

1117

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1104

flags,

1119

void *mc){

1105

void* mc){

1120

1106

if(b == NULL){

1121

1107

return;

1122

1108

}

1182

1168

errno = old_errno;

1183

1169

}

1184

1170

1185

__attribute__((nonnull, warn_unused_result))

1186

1171

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

1187

1172

int ret;

1188

1173

error_t ret_errno;

1207

1192

return true;

1208

1193

}

1209

1194

1210

__attribute__((nonnull, warn_unused_result))

1211

1195

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

1212

1196

1213

1197

/* Reject the loopback device */

1255

1239

* corresponds to an acceptable network device.

1256

1240

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

1257

1241

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1242

int good_interface(const struct dirent *if_entry){

1260

1243

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

1261

1244

return 0;

1279

1262

/*

1280

1263

* This function determines if a network interface is up.

1281

1264

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

1265

bool interface_is_up(const char *interface){

1284

1266

struct ifreq ifr;

1285

1267

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

1296

1278

/*

1297

1279

* This function determines if a network interface is running

1298

1280

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

1281

bool interface_is_running(const char *interface){

1301

1282

struct ifreq ifr;

1302

1283

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

1310

1291

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

1311

1292

}

1312

1293

1313

__attribute__((nonnull, pure, warn_unused_result))

1314

1294

int notdotentries(const struct dirent *direntry){

1315

1295

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

1316

1296

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

1323

1303

}

1324

1304

1325

1305

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1306

int runnable_hook(const struct dirent *direntry){

1328

1307

int ret;

1329

1308

size_t sret;

1337

1316

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

1338

1317

"abcdefghijklmnopqrstuvwxyz"

1339

1318

"0123456789"

1340

"_.-");

1319

"_-");

1341

1320

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

1342

1321

/* Contains non-allowed characters */

1343

1322

if(debug){

1347

1326

return 0;

1348

1327

}

1349

1328

1350

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

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);

1351

1337

if(ret == -1){

1352

1338

if(debug){

1353

1339

perror_plus("Could not stat hook");

1377

1363

return 1;

1378

1364

}

1379

1365

1380

__attribute__((nonnull, warn_unused_result))

1381

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

1367

mandos_context *mc){

1383

1368

int ret;

1452

1437

}

1453

1438

1454

1439

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

1455

__attribute__((warn_unused_result))

1456

1440

error_t raise_privileges(void){

1457

1441

error_t old_errno = errno;

1458

1442

error_t ret_errno = 0;

1465

1449

}

1466

1450

1467

1451

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

1468

__attribute__((warn_unused_result))

1469

1452

error_t raise_privileges_permanently(void){

1470

1453

error_t old_errno = errno;

1471

1454

error_t ret_errno = raise_privileges();

1482

1465

}

1483

1466

1484

1467

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

1485

__attribute__((warn_unused_result))

1486

1468

error_t lower_privileges(void){

1487

1469

error_t old_errno = errno;

1488

1470

error_t ret_errno = 0;

1495

1477

}

1496

1478

1497

1479

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

1480

error_t lower_privileges_permanently(void){

1500

1481

error_t old_errno = errno;

1501

1482

error_t ret_errno = 0;

1507

1488

return ret_errno;

1508

1489

}

1509

1490

1510

#ifndef O_CLOEXEC

1511

/*

1512

* Based on the example in the GNU LibC manual chapter 13.13 "File

1513

* Descriptor Flags".

1514

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1519

/* If reading the flags failed, return error indication now. */

1520

if(ret < 0){

1521

return ret;

1522

}

1523

/* Store modified flag word in the descriptor. */

1524

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

__attribute__((nonnull))

1530

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

1491

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

1531

1492

const float delay){

1532

1493

struct dirent **direntries;

1533

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1541

if(hookdir_fd == -1){

1542

if(errno == ENOENT){

1543

if(debug){

1544

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

1545

" found\n", hookdir);

1546

}

1547

} else {

1548

perror_plus("open");

1549

}

1550

return;

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

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

1567

runnable_hook, alphasort);

1568

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

1569

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

1570

alphasort);

1571

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

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1494

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

1495

alphasort);

1576

1496

if(numhooks == -1){

1577

perror_plus("scandir");

1578

return;

1579

}

1580

struct dirent *direntry;

1581

int ret;

1582

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

1583

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

1584

direntry = direntries[i];

1585

if(debug){

1586

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

1587

direntry->d_name);

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");

1588

1504

}

1589

pid_t hook_pid = fork();

1590

if(hook_pid == 0){

1591

/* Child */

1592

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1594

perror_plus("Failed to raise privileges");

1595

_exit(EX_NOPERM);

1596

}

1597

/* Set group */

1598

errno = 0;

1599

ret = setgid(0);

1600

if(ret == -1){

1601

perror_plus("setgid");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Reset supplementary groups */

1605

errno = 0;

1606

ret = setgroups(0, NULL);

1607

if(ret == -1){

1608

perror_plus("setgroups");

1609

_exit(EX_NOPERM);

1610

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

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

1627

if(ret == -1){

1628

perror_plus("setenv");

1629

_exit(EX_OSERR);

1630

}

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

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

1637

if(ret == -1){

1638

perror_plus("setenv");

1639

_exit(EX_OSERR);

1640

}

1641

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

1642

if(ret == -1){

1643

perror_plus("setenv");

1644

_exit(EX_OSERR);

1645

}

1646

char *delaystring;

1647

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

1648

if(ret == -1){

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){

1649

1514

perror_plus("asprintf");

1650

_exit(EX_OSERR);

1651

}

1652

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

1653

if(ret == -1){

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

}

1654

1573

free(delaystring);

1655

perror_plus("setenv");

1656

_exit(EX_OSERR);

1657

}

1658

free(delaystring);

1659

if(connect_to != NULL){

1660

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

1661

if(ret == -1){

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

}

1666

if(fexecve(hookdir_fd, (char *const [])

1667

{ direntry->d_name, NULL }, environ) == -1){

1668

perror_plus("fexecve");

1669

_exit(EXIT_FAILURE);

1670

}

1671

} else {

1672

int status;

1673

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

1674

perror_plus("waitpid");

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

continue;

1683

}

1684

} else if(WIFSIGNALED(status)){

1685

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

1686

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

1687

WTERMSIG(status));

1688

continue;

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

}

1689

1585

} else {

1690

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

1691

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

1692

continue;

1693

}

1694

}

1695

if(debug){

1696

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

1697

direntry->d_name);

1698

}

1699

}

1700

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

1701

perror_plus("close");

1702

} else {

1703

hookdir_fd = -1;

1704

}

1705

close(devnull);

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;

1706

1622

}

1707

1623

1708

__attribute__((nonnull, warn_unused_result))

1709

1624

error_t bring_up_interface(const char *const interface,

1710

1625

const float delay){

1626

int sd = -1;

1711

1627

error_t old_errno = errno;

1712

int ret;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1713

1630

struct ifreq network;

1714

1631

unsigned int if_index = if_nametoindex(interface);

1715

1632

if(if_index == 0){

1724

1641

}

1725

1642

1726

1643

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

1728

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

1644

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

1729

1645

ret_errno = errno;

1730

1646

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

1731

1647

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

1732

errno = old_errno;

1733

1648

return ret_errno;

1734

1649

}

1735

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

1650

network.ifr_flags |= IFF_UP;

1736

1651

1737

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

1738

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1739

1654

ret_errno = errno;

1740

1655

perror_plus("socket");

1741

1656

errno = old_errno;

1742

1657

return ret_errno;

1743

1658

}

1744

1659

1745

1660

if(quit_now){

1746

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

1747

if(ret == -1){

1748

perror_plus("close");

1749

}

1661

close(sd);

1750

1662

errno = old_errno;

1751

1663

return EINTR;

1752

1664

}

1756

1668

interface);

1757

1669

}

1758

1670

1759

/* Raise privileges */

1760

ret_errno = raise_privileges();

1761

if(ret_errno != 0){

1762

perror_plus("Failed to raise privileges");

1763

}

1671

/* Raise priviliges */

1672

raise_privileges();

1764

1673

1765

1674

#ifdef __linux__

1766

int ret_linux;

1767

bool restore_loglevel = false;

1768

if(ret_errno == 0){

1769

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1770

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

1771

ret_linux = klogctl(8, NULL, 5);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

} else {

1775

restore_loglevel = true;

1776

}

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");

1777

1682

}

1778

1683

#endif /* __linux__ */

1779

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

1780

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

1781

1686

#ifdef __linux__

1782

1687

if(restore_loglevel){

1783

1688

ret_linux = klogctl(7, NULL, 0);

1787

1692

}

1788

1693

#endif /* __linux__ */

1789

1694

1790

/* If raise_privileges() succeeded above */

1791

if(ret_errno == 0){

1792

/* Lower privileges */

1793

ret_errno = lower_privileges();

1794

if(ret_errno != 0){

1795

errno = ret_errno;

1796

perror_plus("Failed to lower privileges");

1797

}

1798

}

1695

/* Lower privileges */

1696

lower_privileges();

1799

1697

1800

1698

/* Close the socket */

1801

1699

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

1804

1702

}

1805

1703

1806

1704

if(ret_setflags == -1){

1807

errno = ioctl_errno;

1705

errno = ret_errno;

1808

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1809

1707

errno = old_errno;

1810

return ioctl_errno;

1708

return ret_errno;

1811

1709

}

1812

1710

} else if(debug){

1813

1711

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

1831

1729

return 0;

1832

1730

}

1833

1731

1834

__attribute__((nonnull, warn_unused_result))

1835

1732

error_t take_down_interface(const char *const interface){

1836

1733

error_t old_errno = errno;

1837

1734

struct ifreq network;

1842

1739

return ENXIO;

1843

1740

}

1844

1741

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

1742

error_t ret_errno = 0;

1846

1743

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

1847

1744

ret_errno = errno;

1848

1745

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

1849

1746

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

1850

errno = old_errno;

1851

1747

return ret_errno;

1852

1748

}

1853

1749

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

1854

1750

1855

1751

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

1856

if(sd == -1){

1752

if(sd < 0){

1857

1753

ret_errno = errno;

1858

1754

perror_plus("socket");

1859

1755

errno = old_errno;

1865

1761

interface);

1866

1762

}

1867

1763

1868

/* Raise privileges */

1869

ret_errno = raise_privileges();

1870

if(ret_errno != 0){

1871

perror_plus("Failed to raise privileges");

1872

}

1764

/* Raise priviliges */

1765

raise_privileges();

1873

1766

1874

1767

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

1875

ioctl_errno = errno;

1768

ret_errno = errno;

1876

1769

1877

/* If raise_privileges() succeeded above */

1878

if(ret_errno == 0){

1879

/* Lower privileges */

1880

ret_errno = lower_privileges();

1881

if(ret_errno != 0){

1882

errno = ret_errno;

1883

perror_plus("Failed to lower privileges");

1884

}

1885

}

1770

/* Lower privileges */

1771

lower_privileges();

1886

1772

1887

1773

/* Close the socket */

1888

1774

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

1891

1777

}

1892

1778

1893

1779

if(ret_setflags == -1){

1894

errno = ioctl_errno;

1780

errno = ret_errno;

1895

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1896

1782

errno = old_errno;

1897

return ioctl_errno;

1783

return ret_errno;

1898

1784

}

1899

1785

} else if(debug){

1900

1786

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

1908

1794

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

1909

1795

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

1910

1796

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

1911

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

1797

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

1912

1798

.interfaces = NULL, .interfaces_size = 0 };

1913

1799

AvahiSServiceBrowser *sb = NULL;

1914

1800

error_t ret_errno;

1918

1804

int exitcode = EXIT_SUCCESS;

1919

1805

char *interfaces_to_take_down = NULL;

1920

1806

size_t interfaces_to_take_down_size = 0;

1921

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

1922

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

1923

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

1924

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

1810

const char *seckey = PATHDIR "/" SECKEY;

1926

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2108

1993

/* Work around Debian bug #633582:

2109

1994

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

2110

1995

2111

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2115

perror_plus("Failed to raise privileges");

2116

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2117

1998

struct stat st;

2118

1999

2119

2000

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

2159

2040

}

2160

2041

2161

2042

/* Lower privileges */

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2165

perror_plus("Failed to lower privileges");

2166

}

2043

lower_privileges();

2167

2044

}

2168

2045

}

2169

2046

2195

2072

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

2196

2073

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

2197

2074

}

2198

run_network_hooks("start", interfaces_hooks != NULL ?

2199

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2200

2079

}

2201

2080

2202

2081

if(not debug){

2330

2209

break;

2331

2210

}

2332

2211

bool interface_was_up = interface_is_up(interface);

2333

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2334

2213

if(not interface_was_up){

2335

if(errno != 0){

2214

if(ret != 0){

2215

errno = ret;

2336

2216

perror_plus("Failed to bring up interface");

2337

2217

} else {

2338

errno = argz_add(&interfaces_to_take_down,

2339

&interfaces_to_take_down_size,

2340

interface);

2341

if(errno != 0){

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;

2342

2223

perror_plus("argz_add");

2343

2224

}

2344

2225

}

2375

2256

goto end;

2376

2257

}

2377

2258

2378

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

2379

tempdir = mkdtemp(run_tempdir);

2380

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

2381

if(debug){

2382

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

2383

run_tempdir, old_tempdir);

2384

}

2385

tempdir = mkdtemp(old_tempdir);

2386

}

2387

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2388

2260

perror_plus("mkdtemp");

2389

2261

goto end;

2390

2262

}

2263

tempdir_created = true;

2391

2264

2392

2265

if(quit_now){

2393

2266

goto end;

2529

2402

if(debug){

2530

2403

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

2531

2404

}

2532

2405

2533

2406

ret = avahi_loop_with_timeout(simple_poll,

2534

2407

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

2535

2408

if(debug){

2576

2449

}

2577

2450

}

2578

2451

2579

/* Re-raise privileges */

2452

/* Re-raise priviliges */

2580

2453

{

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

2583

perror_plus("Failed to raise privileges");

2584

} else {

2585

2586

/* Run network hooks */

2587

run_network_hooks("stop", interfaces_hooks != NULL ?

2588

interfaces_hooks : "", delay);

2589

2590

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

2591

{

2592

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

2599

perror_plus("Failed to take down interface");

2600

}

2601

}

2602

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

2603

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

2604

" down\n");

2605

}

2606

}

2607

}

2608

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

2612

}

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();

2613

2479

}

2614

2480

2615

2481

free(interfaces_to_take_down);

2616

2482

free(interfaces_hooks);

2617

2483

2618

2484

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

2619

if(tempdir != NULL){

2485

if(tempdir_created){

2620

2486

struct dirent **direntries = NULL;

2621

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

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

alphasort);

2627

if(numentries > 0){

2628

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

2629

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

2630

if(ret == -1){

2631

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

2632

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

2633

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

2634

}

2635

}

2636

2637

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

2638

free(direntries);

2639

if(numentries == -1){

2640

perror_plus("scandir");

2641

}

2642

ret = rmdir(tempdir);

2643

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

2644

perror_plus("rmdir");

2645

}

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);

2646

2506

}

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2648

2517

}

2649

2518

}

2650

2519