/mandos/release : revision 237.7.219

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

141

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

142

char *connect_to = NULL;

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

144

uid_t uid = 65534;

146

145

gid_t gid = 65534;

147

146

184

183

perror(print_text);

185

184

}

186

185

187

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

186

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

188

187

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

189

188

va_list ap;

190

189

va_start (ap, format);

199

198

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

200

199

* "buffer_length" is how much is already used.

201

200

*/

202

__attribute__((nonnull, warn_unused_result))

203

201

size_t incbuffer(char **buffer, size_t buffer_length,

204

202

size_t buffer_capacity){

205

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

218

216

}

219

217

220

218

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

221

__attribute__((nonnull, warn_unused_result))

222

219

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

223

220

int af, server **current_server){

224

221

int ret;

245

242

new_server->next = new_server;

246

243

new_server->prev = new_server;

247

244

*current_server = new_server;

245

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

248

246

} else {

249

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

250

247

new_server->next = *current_server;

251

248

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

252

249

new_server->prev->next = new_server;

258

255

/*

259

256

* Initialize GPGME.

260

257

*/

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

258

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

259

const char *tempdir, mandos_context *mc){

266

260

gpgme_error_t rc;

267

261

gpgme_engine_info_t engine_info;

268

262

269

263

/*

270

264

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

271

265

*/

272

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

273

267

int ret;

274

268

int fd;

275

269

gpgme_data_t pgp_data;

356

350

* Decrypt OpenPGP data.

357

351

* Returns -1 on error

358

352

*/

359

__attribute__((nonnull, warn_unused_result))

360

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

361

354

size_t crypto_size,

362

355

char **plaintext,

482

475

return plaintext_length;

483

476

}

484

477

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

487

479

const char *ret = gnutls_strerror(value);

488

480

if(ret == NULL)

489

481

ret = "(unknown)";

491

483

}

492

484

493

485

/* GnuTLS log function callback */

494

__attribute__((nonnull))

495

486

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

496

487

const char* string){

497

488

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

498

489

}

499

490

500

__attribute__((nonnull, warn_unused_result))

501

491

static int init_gnutls_global(const char *pubkeyfilename,

502

492

const char *seckeyfilename,

503

493

mandos_context *mc){

577

567

return -1;

578

568

}

579

569

580

__attribute__((nonnull, warn_unused_result))

581

570

static int init_gnutls_session(gnutls_session_t *session,

582

571

mandos_context *mc){

583

572

int ret;

640

629

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

641

630

642

631

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

644

632

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

645

633

AvahiIfIndex if_index,

646

634

int af, mandos_context *mc){

752

740

goto mandos_end;

753

741

}

754

742

if(af == AF_INET6){

755

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

743

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

756

744

if(IN6_IS_ADDR_LINKLOCAL

757

745

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

758

746

if(if_index == AVAHI_IF_UNSPEC){

1042

1030

return retval;

1043

1031

}

1044

1032

1045

__attribute__((nonnull))

1046

1033

static void resolve_callback(AvahiSServiceResolver *r,

1047

1034

AvahiIfIndex interface,

1048

1035

AvahiProtocol proto,

1056

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1057

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1045

flags,

1059

void *mc){

1046

void* mc){

1060

1047

if(r == NULL){

1061

1048

return;

1062

1049

}

1115

1102

const char *domain,

1116

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1117

1104

flags,

1118

void *mc){

1105

void* mc){

1119

1106

if(b == NULL){

1120

1107

return;

1121

1108

}

1181

1168

errno = old_errno;

1182

1169

}

1183

1170

1184

__attribute__((nonnull, warn_unused_result))

1185

1171

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

1186

1172

int ret;

1187

1173

error_t ret_errno;

1206

1192

return true;

1207

1193

}

1208

1194

1209

__attribute__((nonnull, warn_unused_result))

1210

1195

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

1211

1196

1212

1197

/* Reject the loopback device */

1254

1239

* corresponds to an acceptable network device.

1255

1240

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

1256

1241

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

1242

int good_interface(const struct dirent *if_entry){

1259

1243

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

1260

1244

return 0;

1278

1262

/*

1279

1263

* This function determines if a network interface is up.

1280

1264

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

1265

bool interface_is_up(const char *interface){

1283

1266

struct ifreq ifr;

1284

1267

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

1295

1278

/*

1296

1279

* This function determines if a network interface is running

1297

1280

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

1281

bool interface_is_running(const char *interface){

1300

1282

struct ifreq ifr;

1301

1283

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

1309

1291

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

1310

1292

}

1311

1293

1312

__attribute__((nonnull, pure, warn_unused_result))

1313

1294

int notdotentries(const struct dirent *direntry){

1314

1295

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

1315

1296

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

1322

1303

}

1323

1304

1324

1305

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

1325

__attribute__((nonnull, warn_unused_result))

1326

1306

int runnable_hook(const struct dirent *direntry){

1327

1307

int ret;

1328

1308

size_t sret;

1336

1316

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

1337

1317

"abcdefghijklmnopqrstuvwxyz"

1338

1318

"0123456789"

1339

"_.-");

1319

"_-");

1340

1320

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

1341

1321

/* Contains non-allowed characters */

1342

1322

if(debug){

1346

1326

return 0;

1347

1327

}

1348

1328

1349

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);

1350

1337

if(ret == -1){

1351

1338

if(debug){

1352

1339

perror_plus("Could not stat hook");

1376

1363

return 1;

1377

1364

}

1378

1365

1379

__attribute__((nonnull, warn_unused_result))

1380

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1381

1367

mandos_context *mc){

1382

1368

int ret;

1451

1437

}

1452

1438

1453

1439

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

1454

__attribute__((warn_unused_result))

1455

1440

error_t raise_privileges(void){

1456

1441

error_t old_errno = errno;

1457

1442

error_t ret_errno = 0;

1464

1449

}

1465

1450

1466

1451

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

1467

__attribute__((warn_unused_result))

1468

1452

error_t raise_privileges_permanently(void){

1469

1453

error_t old_errno = errno;

1470

1454

error_t ret_errno = raise_privileges();

1481

1465

}

1482

1466

1483

1467

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

1484

__attribute__((warn_unused_result))

1485

1468

error_t lower_privileges(void){

1486

1469

error_t old_errno = errno;

1487

1470

error_t ret_errno = 0;

1494

1477

}

1495

1478

1496

1479

/* Lower privileges permanently */

1497

__attribute__((warn_unused_result))

1498

1480

error_t lower_privileges_permanently(void){

1499

1481

error_t old_errno = errno;

1500

1482

error_t ret_errno = 0;

1506

1488

return ret_errno;

1507

1489

}

1508

1490

1509

#ifndef O_CLOEXEC

1510

/*

1511

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

1512

* Descriptor Flags".

1513

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

1514

*/

1515

__attribute__((warn_unused_result))

1516

static int set_cloexec_flag(int fd){

1517

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

1518

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

1519

if(ret < 0){

1520

return ret;

1521

}

1522

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

1523

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

1524

ret | FD_CLOEXEC));

1525

}

1526

#endif /* not O_CLOEXEC */

1527

1528

__attribute__((nonnull))

1529

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

1491

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

1530

1492

const float delay){

1531

1493

struct dirent **direntries;

1532

if(hookdir_fd == -1){

1533

hookdir_fd = open(hookdir, O_RDONLY |

1534

#ifdef O_CLOEXEC

1535

O_CLOEXEC

1536

#else /* not O_CLOEXEC */

1537

0

1538

#endif /* not O_CLOEXEC */

1539

);

1540

if(hookdir_fd == -1){

1541

if(errno == ENOENT){

1542

if(debug){

1543

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

1544

" found\n", hookdir);

1545

}

1546

} else {

1547

perror_plus("open");

1548

}

1549

return;

1550

}

1551

#ifndef O_CLOEXEC

1552

if(set_cloexec_flag(hookdir_fd) < 0){

1553

perror_plus("set_cloexec_flag");

1554

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

1555

perror_plus("close");

1556

} else {

1557

hookdir_fd = -1;

1558

}

1559

return;

1560

}

1561

#endif /* not O_CLOEXEC */

1562

}

1563

#ifdef __GLIBC__

1564

#if __GLIBC_PREREQ(2, 15)

1565

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

1566

runnable_hook, alphasort);

1567

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

1568

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

1569

alphasort);

1570

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

1571

#else /* not __GLIBC__ */

1572

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

1573

alphasort);

1574

#endif /* not __GLIBC__ */

1494

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

1495

alphasort);

1575

1496

if(numhooks == -1){

1576

perror_plus("scandir");

1577

return;

1578

}

1579

struct dirent *direntry;

1580

int ret;

1581

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

1582

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

1583

direntry = direntries[i];

1584

if(debug){

1585

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

1586

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");

1587

1504

}

1588

pid_t hook_pid = fork();

1589

if(hook_pid == 0){

1590

/* Child */

1591

/* Raise privileges */

1592

if(raise_privileges_permanently() != 0){

1593

perror_plus("Failed to raise privileges");

1594

_exit(EX_NOPERM);

1595

}

1596

/* Set group */

1597

errno = 0;

1598

ret = setgid(0);

1599

if(ret == -1){

1600

perror_plus("setgid");

1601

_exit(EX_NOPERM);

1602

}

1603

/* Reset supplementary groups */

1604

errno = 0;

1605

ret = setgroups(0, NULL);

1606

if(ret == -1){

1607

perror_plus("setgroups");

1608

_exit(EX_NOPERM);

1609

}

1610

ret = dup2(devnull, STDIN_FILENO);

1611

if(ret == -1){

1612

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

1613

_exit(EX_OSERR);

1614

}

1615

ret = close(devnull);

1616

if(ret == -1){

1617

perror_plus("close");

1618

_exit(EX_OSERR);

1619

}

1620

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1621

if(ret == -1){

1622

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

1623

_exit(EX_OSERR);

1624

}

1625

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

1626

if(ret == -1){

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

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

1631

if(ret == -1){

1632

perror_plus("setenv");

1633

_exit(EX_OSERR);

1634

}

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

_exit(EX_OSERR);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

_exit(EX_OSERR);

1644

}

1645

char *delaystring;

1646

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

1647

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){

1648

1514

perror_plus("asprintf");

1649

_exit(EX_OSERR);

1650

}

1651

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

1652

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

}

1653

1573

free(delaystring);

1654

perror_plus("setenv");

1655

_exit(EX_OSERR);

1656

}

1657

free(delaystring);

1658

if(connect_to != NULL){

1659

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

1660

if(ret == -1){

1661

perror_plus("setenv");

1662

_exit(EX_OSERR);

1663

}

1664

}

1665

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

1666

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

1667

perror_plus("fexecve");

1668

_exit(EXIT_FAILURE);

1669

}

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

continue;

1675

}

1676

if(WIFEXITED(status)){

1677

if(WEXITSTATUS(status) != 0){

1678

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

1679

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

1680

WEXITSTATUS(status));

1681

continue;

1682

}

1683

} else if(WIFSIGNALED(status)){

1684

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

1685

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

1686

WTERMSIG(status));

1687

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

}

1688

1585

} else {

1689

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

1690

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

1691

continue;

1692

}

1693

}

1694

if(debug){

1695

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

1696

direntry->d_name);

1697

}

1698

}

1699

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

1700

perror_plus("close");

1701

} else {

1702

hookdir_fd = -1;

1703

}

1704

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;

1705

1622

}

1706

1623

1707

__attribute__((nonnull, warn_unused_result))

1708

1624

error_t bring_up_interface(const char *const interface,

1709

1625

const float delay){

1626

int sd = -1;

1710

1627

error_t old_errno = errno;

1711

int ret;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1712

1630

struct ifreq network;

1713

1631

unsigned int if_index = if_nametoindex(interface);

1714

1632

if(if_index == 0){

1723

1641

}

1724

1642

1725

1643

if(not interface_is_up(interface)){

1726

error_t ret_errno = 0, ioctl_errno = 0;

1727

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

1644

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

1728

1645

ret_errno = errno;

1729

1646

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

1730

1647

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

1731

errno = old_errno;

1732

1648

return ret_errno;

1733

1649

}

1734

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

1650

network.ifr_flags |= IFF_UP;

1735

1651

1736

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

1737

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1738

1654

ret_errno = errno;

1739

1655

perror_plus("socket");

1740

1656

errno = old_errno;

1741

1657

return ret_errno;

1742

1658

}

1743

1659

1744

1660

if(quit_now){

1745

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

1746

if(ret == -1){

1747

perror_plus("close");

1748

}

1661

close(sd);

1749

1662

errno = old_errno;

1750

1663

return EINTR;

1751

1664

}

1755

1668

interface);

1756

1669

}

1757

1670

1758

/* Raise privileges */

1759

ret_errno = raise_privileges();

1760

if(ret_errno != 0){

1761

perror_plus("Failed to raise privileges");

1762

}

1671

/* Raise priviliges */

1672

raise_privileges();

1763

1673

1764

1674

#ifdef __linux__

1765

int ret_linux;

1766

bool restore_loglevel = false;

1767

if(ret_errno == 0){

1768

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1769

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

1770

ret_linux = klogctl(8, NULL, 5);

1771

if(ret_linux == -1){

1772

perror_plus("klogctl");

1773

} else {

1774

restore_loglevel = true;

1775

}

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");

1776

1682

}

1777

1683

#endif /* __linux__ */

1778

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

1779

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

1780

1686

#ifdef __linux__

1781

1687

if(restore_loglevel){

1782

1688

ret_linux = klogctl(7, NULL, 0);

1786

1692

}

1787

1693

#endif /* __linux__ */

1788

1694

1789

/* If raise_privileges() succeeded above */

1790

if(ret_errno == 0){

1791

/* Lower privileges */

1792

ret_errno = lower_privileges();

1793

if(ret_errno != 0){

1794

errno = ret_errno;

1795

perror_plus("Failed to lower privileges");

1796

}

1797

}

1695

/* Lower privileges */

1696

lower_privileges();

1798

1697

1799

1698

/* Close the socket */

1800

1699

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

1803

1702

}

1804

1703

1805

1704

if(ret_setflags == -1){

1806

errno = ioctl_errno;

1705

errno = ret_errno;

1807

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1808

1707

errno = old_errno;

1809

return ioctl_errno;

1708

return ret_errno;

1810

1709

}

1811

1710

} else if(debug){

1812

1711

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

1830

1729

return 0;

1831

1730

}

1832

1731

1833

__attribute__((nonnull, warn_unused_result))

1834

1732

error_t take_down_interface(const char *const interface){

1835

1733

error_t old_errno = errno;

1836

1734

struct ifreq network;

1841

1739

return ENXIO;

1842

1740

}

1843

1741

if(interface_is_up(interface)){

1844

error_t ret_errno = 0, ioctl_errno = 0;

1742

error_t ret_errno = 0;

1845

1743

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

1846

1744

ret_errno = errno;

1847

1745

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

1848

1746

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

1849

errno = old_errno;

1850

1747

return ret_errno;

1851

1748

}

1852

1749

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

1853

1750

1854

1751

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

1855

if(sd == -1){

1752

if(sd < 0){

1856

1753

ret_errno = errno;

1857

1754

perror_plus("socket");

1858

1755

errno = old_errno;

1864

1761

interface);

1865

1762

}

1866

1763

1867

/* Raise privileges */

1868

ret_errno = raise_privileges();

1869

if(ret_errno != 0){

1870

perror_plus("Failed to raise privileges");

1871

}

1764

/* Raise priviliges */

1765

raise_privileges();

1872

1766

1873

1767

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

1874

ioctl_errno = errno;

1768

ret_errno = errno;

1875

1769

1876

/* If raise_privileges() succeeded above */

1877

if(ret_errno == 0){

1878

/* Lower privileges */

1879

ret_errno = lower_privileges();

1880

if(ret_errno != 0){

1881

errno = ret_errno;

1882

perror_plus("Failed to lower privileges");

1883

}

1884

}

1770

/* Lower privileges */

1771

lower_privileges();

1885

1772

1886

1773

/* Close the socket */

1887

1774

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

1890

1777

}

1891

1778

1892

1779

if(ret_setflags == -1){

1893

errno = ioctl_errno;

1780

errno = ret_errno;

1894

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1895

1782

errno = old_errno;

1896

return ioctl_errno;

1783

return ret_errno;

1897

1784

}

1898

1785

} else if(debug){

1899

1786

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

1907

1794

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

1908

1795

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

1909

1796

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

1910

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

1797

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

1911

1798

.interfaces = NULL, .interfaces_size = 0 };

1912

1799

AvahiSServiceBrowser *sb = NULL;

1913

1800

error_t ret_errno;

1917

1804

int exitcode = EXIT_SUCCESS;

1918

1805

char *interfaces_to_take_down = NULL;

1919

1806

size_t interfaces_to_take_down_size = 0;

1920

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

1921

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

1922

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

1923

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1924

1810

const char *seckey = PATHDIR "/" SECKEY;

1925

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2107

1993

/* Work around Debian bug #633582:

2108

1994

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

2109

1995

2110

/* Re-raise privileges */

2111

ret_errno = raise_privileges();

2112

if(ret_errno != 0){

2113

errno = ret_errno;

2114

perror_plus("Failed to raise privileges");

2115

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2116

1998

struct stat st;

2117

1999

2118

2000

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

2158

2040

}

2159

2041

2160

2042

/* Lower privileges */

2161

ret_errno = lower_privileges();

2162

if(ret_errno != 0){

2163

errno = ret_errno;

2164

perror_plus("Failed to lower privileges");

2165

}

2043

lower_privileges();

2166

2044

}

2167

2045

}

2168

2046

2194

2072

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

2195

2073

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

2196

2074

}

2197

run_network_hooks("start", interfaces_hooks != NULL ?

2198

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2199

2079

}

2200

2080

2201

2081

if(not debug){

2329

2209

break;

2330

2210

}

2331

2211

bool interface_was_up = interface_is_up(interface);

2332

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2333

2213

if(not interface_was_up){

2334

if(errno != 0){

2214

if(ret != 0){

2215

errno = ret;

2335

2216

perror_plus("Failed to bring up interface");

2336

2217

} else {

2337

errno = argz_add(&interfaces_to_take_down,

2338

&interfaces_to_take_down_size,

2339

interface);

2340

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;

2341

2223

perror_plus("argz_add");

2342

2224

}

2343

2225

}

2374

2256

goto end;

2375

2257

}

2376

2258

2377

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

2378

tempdir = mkdtemp(run_tempdir);

2379

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

2380

if(debug){

2381

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

2382

run_tempdir, old_tempdir);

2383

}

2384

tempdir = mkdtemp(old_tempdir);

2385

}

2386

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2387

2260

perror_plus("mkdtemp");

2388

2261

goto end;

2389

2262

}

2263

tempdir_created = true;

2390

2264

2391

2265

if(quit_now){

2392

2266

goto end;

2528

2402

if(debug){

2529

2403

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

2530

2404

}

2531

2405

2532

2406

ret = avahi_loop_with_timeout(simple_poll,

2533

2407

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

2534

2408

if(debug){

2575

2449

}

2576

2450

}

2577

2451

2578

/* Re-raise privileges */

2452

/* Re-raise priviliges */

2579

2453

{

2580

ret_errno = raise_privileges();

2581

if(ret_errno != 0){

2582

perror_plus("Failed to raise privileges");

2583

} else {

2584

2585

/* Run network hooks */

2586

run_network_hooks("stop", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

while((interface=argz_next(interfaces_to_take_down,

2593

interfaces_to_take_down_size,

2594

interface))){

2595

ret_errno = take_down_interface(interface);

2596

if(ret_errno != 0){

2597

errno = ret_errno;

2598

perror_plus("Failed to take down interface");

2599

}

2600

}

2601

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

2602

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

2603

" down\n");

2604

}

2605

}

2606

}

2607

2608

ret_errno = lower_privileges_permanently();

2609

if(ret_errno != 0){

2610

perror_plus("Failed to lower privileges permanently");

2611

}

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();

2612

2479

}

2613

2480

2614

2481

free(interfaces_to_take_down);

2615

2482

free(interfaces_hooks);

2616

2483

2617

2484

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

2618

if(tempdir != NULL){

2485

if(tempdir_created){

2619

2486

struct dirent **direntries = NULL;

2620

2487

struct dirent *direntry = NULL;

2621

2488

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

2638

2505

free(fullname);

2639

2506

}

2640

2507

}

2641

2508

2642

2509

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

2643

2510

free(direntries);

2644

2511

if(numentries == -1){