/mandos/trunk : revision 714

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;

230

234

.af = af };

231

235

if(new_server->ip == NULL){

232

236

perror_plus("strdup");

237

free(new_server);

233

238

return false;

234

239

}

235

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

236

241

if(ret == -1){

237

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

238

252

return false;

239

253

}

240

254

/* Special case of first server */

242

256

new_server->next = new_server;

243

257

new_server->prev = new_server;

244

258

*current_server = new_server;

245

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

246

259

} else {

260

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

247

261

new_server->next = *current_server;

248

262

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

249

263

new_server->prev->next = new_server;

255

269

/*

256

270

* Initialize GPGME.

257

271

*/

258

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

259

const char *tempdir, mandos_context *mc){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

260

277

gpgme_error_t rc;

261

278

gpgme_engine_info_t engine_info;

262

279

263

280

/*

264

281

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

265

282

*/

266

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

267

284

int ret;

268

285

int fd;

269

286

gpgme_data_t pgp_data;

350

367

* Decrypt OpenPGP data.

351

368

* Returns -1 on error

352

369

*/

370

__attribute__((nonnull, warn_unused_result))

353

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

372

size_t crypto_size,

355

373

char **plaintext,

475

493

return plaintext_length;

476

494

}

477

495

478

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

479

498

const char *ret = gnutls_strerror(value);

480

499

if(ret == NULL)

481

500

ret = "(unknown)";

483

502

}

484

503

485

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

486

506

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

487

507

const char* string){

488

508

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

489

509

}

490

510

511

__attribute__((nonnull, warn_unused_result))

491

512

static int init_gnutls_global(const char *pubkeyfilename,

492

513

const char *seckeyfilename,

493

514

mandos_context *mc){

567

588

return -1;

568

589

}

569

590

591

__attribute__((nonnull, warn_unused_result))

570

592

static int init_gnutls_session(gnutls_session_t *session,

571

593

mandos_context *mc){

572

594

int ret;

629

651

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

630

652

631

653

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

632

655

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

633

656

AvahiIfIndex if_index,

634

657

int af, mandos_context *mc){

740

763

goto mandos_end;

741

764

}

742

765

if(af == AF_INET6){

743

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

766

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

744

767

if(IN6_IS_ADDR_LINKLOCAL

745

768

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

746

769

if(if_index == AVAHI_IF_UNSPEC){

1030

1053

return retval;

1031

1054

}

1032

1055

1056

__attribute__((nonnull))

1033

1057

static void resolve_callback(AvahiSServiceResolver *r,

1034

1058

AvahiIfIndex interface,

1035

1059

AvahiProtocol proto,

1043

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1069

flags,

1046

void* mc){

1070

void *mc){

1047

1071

if(r == NULL){

1048

1072

return;

1049

1073

}

1102

1126

const char *domain,

1103

1127

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1128

flags,

1105

void* mc){

1129

void *mc){

1106

1130

if(b == NULL){

1107

1131

return;

1108

1132

}

1168

1192

errno = old_errno;

1169

1193

}

1170

1194

1195

__attribute__((nonnull, warn_unused_result))

1171

1196

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

1172

1197

int ret;

1173

1198

error_t ret_errno;

1192

1217

return true;

1193

1218

}

1194

1219

1220

__attribute__((nonnull, warn_unused_result))

1195

1221

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

1196

1222

1197

1223

/* Reject the loopback device */

1239

1265

* corresponds to an acceptable network device.

1240

1266

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

1241

1267

*/

1268

__attribute__((nonnull, warn_unused_result))

1242

1269

int good_interface(const struct dirent *if_entry){

1243

1270

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

1244

1271

return 0;

1262

1289

/*

1263

1290

* This function determines if a network interface is up.

1264

1291

*/

1292

__attribute__((nonnull, warn_unused_result))

1265

1293

bool interface_is_up(const char *interface){

1266

1294

struct ifreq ifr;

1267

1295

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

1278

1306

/*

1279

1307

* This function determines if a network interface is running

1280

1308

*/

1309

__attribute__((nonnull, warn_unused_result))

1281

1310

bool interface_is_running(const char *interface){

1282

1311

struct ifreq ifr;

1283

1312

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

1291

1320

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

1292

1321

}

1293

1322

1323

__attribute__((nonnull, pure, warn_unused_result))

1294

1324

int notdotentries(const struct dirent *direntry){

1295

1325

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

1296

1326

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

1303

1333

}

1304

1334

1305

1335

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

1336

__attribute__((nonnull, warn_unused_result))

1306

1337

int runnable_hook(const struct dirent *direntry){

1307

1338

int ret;

1308

1339

size_t sret;

1316

1347

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

1317

1348

"abcdefghijklmnopqrstuvwxyz"

1318

1349

"0123456789"

1319

"_-");

1350

"_.-");

1320

1351

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

1321

1352

/* Contains non-allowed characters */

1322

1353

if(debug){

1326

1357

return 0;

1327

1358

}

1328

1359

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);

1360

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

1337

1361

if(ret == -1){

1338

1362

if(debug){

1339

1363

perror_plus("Could not stat hook");

1363

1387

return 1;

1364

1388

}

1365

1389

1390

__attribute__((nonnull, warn_unused_result))

1366

1391

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

1392

mandos_context *mc){

1368

1393

int ret;

1437

1462

}

1438

1463

1439

1464

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

1465

__attribute__((warn_unused_result))

1440

1466

error_t raise_privileges(void){

1441

1467

error_t old_errno = errno;

1442

1468

error_t ret_errno = 0;

1443

1469

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

1444

1470

ret_errno = errno;

1445

perror_plus("seteuid");

1446

1471

}

1447

1472

errno = old_errno;

1448

1473

return ret_errno;

1449

1474

}

1450

1475

1451

1476

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

1477

__attribute__((warn_unused_result))

1452

1478

error_t raise_privileges_permanently(void){

1453

1479

error_t old_errno = errno;

1454

1480

error_t ret_errno = raise_privileges();

1458

1484

}

1459

1485

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

1460

1486

ret_errno = errno;

1461

perror_plus("seteuid");

1462

1487

}

1463

1488

errno = old_errno;

1464

1489

return ret_errno;

1465

1490

}

1466

1491

1467

1492

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

1493

__attribute__((warn_unused_result))

1468

1494

error_t lower_privileges(void){

1469

1495

error_t old_errno = errno;

1470

1496

error_t ret_errno = 0;

1471

1497

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

1472

1498

ret_errno = errno;

1473

perror_plus("seteuid");

1474

1499

}

1475

1500

errno = old_errno;

1476

1501

return ret_errno;

1477

1502

}

1478

1503

1479

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1480

1506

error_t lower_privileges_permanently(void){

1481

1507

error_t old_errno = errno;

1482

1508

error_t ret_errno = 0;

1483

1509

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

1484

1510

ret_errno = errno;

1485

perror_plus("setuid");

1486

1511

}

1487

1512

errno = old_errno;

1488

1513

return ret_errno;

1489

1514

}

1490

1515

1491

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

1516

__attribute__((nonnull))

1517

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

1492

1518

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1519

struct dirent **direntries = NULL;

1520

if(hookdir_fd == -1){

1521

hookdir_fd = open(hookdir, O_RDONLY);

1522

if(hookdir_fd == -1){

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("open");

1530

}

1531

return;

1532

}

1533

}

1534

#ifdef __GLIBC__

1535

#if __GLIBC_PREREQ(2, 15)

1536

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

1537

runnable_hook, alphasort);

1538

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

1539

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

1540

alphasort);

1541

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

1542

#else /* not __GLIBC__ */

1543

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

1544

alphasort);

1545

#endif /* not __GLIBC__ */

1496

1546

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");

1547

perror_plus("scandir");

1548

return;

1549

}

1550

struct dirent *direntry;

1551

int ret;

1552

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

1553

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

1554

direntry = direntries[i];

1555

if(debug){

1556

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

1557

direntry->d_name);

1504

1558

}

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){

1559

pid_t hook_pid = fork();

1560

if(hook_pid == 0){

1561

/* Child */

1562

/* Raise privileges */

1563

errno = raise_privileges_permanently();

1564

if(errno != 0){

1565

perror_plus("Failed to raise privileges");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Set group */

1569

errno = 0;

1570

ret = setgid(0);

1571

if(ret == -1){

1572

perror_plus("setgid");

1573

_exit(EX_NOPERM);

1574

}

1575

/* Reset supplementary groups */

1576

errno = 0;

1577

ret = setgroups(0, NULL);

1578

if(ret == -1){

1579

perror_plus("setgroups");

1580

_exit(EX_NOPERM);

1581

}

1582

ret = dup2(devnull, STDIN_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

ret = close(devnull);

1588

if(ret == -1){

1589

perror_plus("close");

1590

_exit(EX_OSERR);

1591

}

1592

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1593

if(ret == -1){

1594

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

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

perror_plus("setenv");

1610

_exit(EX_OSERR);

1611

}

1612

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

1613

if(ret == -1){

1614

perror_plus("setenv");

1615

_exit(EX_OSERR);

1616

}

1617

char *delaystring;

1618

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

1619

if(ret == -1){

1514

1620

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

}

1621

_exit(EX_OSERR);

1622

}

1623

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

1624

if(ret == -1){

1573

1625

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

}

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

free(delaystring);

1630

if(connect_to != NULL){

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

}

1637

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

1638

if(hook_fd == -1){

1639

perror_plus("openat");

1640

_exit(EXIT_FAILURE);

1641

}

1642

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

1643

perror_plus("close");

1644

_exit(EXIT_FAILURE);

1645

}

1646

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

1647

environ) == -1){

1648

perror_plus("fexecve");

1649

_exit(EXIT_FAILURE);

1650

}

1651

} else {

1652

int status;

1653

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

1654

perror_plus("waitpid");

1655

continue;

1656

}

1657

if(WIFEXITED(status)){

1658

if(WEXITSTATUS(status) != 0){

1659

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

1660

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

1661

WEXITSTATUS(status));

1662

continue;

1663

}

1664

} else if(WIFSIGNALED(status)){

1665

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

1666

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

1667

WTERMSIG(status));

1668

continue;

1585

1669

} 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;

1670

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

1671

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

1672

continue;

1673

}

1674

}

1675

if(debug){

1676

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

1677

direntry->d_name);

1678

}

1679

}

1680

free(direntries);

1681

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

1682

perror_plus("close");

1683

} else {

1684

hookdir_fd = -1;

1685

}

1686

close(devnull);

1622

1687

}

1623

1688

1689

__attribute__((nonnull, warn_unused_result))

1624

1690

error_t bring_up_interface(const char *const interface,

1625

1691

const float delay){

1626

int sd = -1;

1627

1692

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1693

int ret;

1630

1694

struct ifreq network;

1631

1695

unsigned int if_index = if_nametoindex(interface);

1632

1696

if(if_index == 0){

1641

1705

}

1642

1706

1643

1707

if(not interface_is_up(interface)){

1644

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

1708

error_t ret_errno = 0, ioctl_errno = 0;

1709

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

1645

1710

ret_errno = errno;

1646

1711

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

1647

1712

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

1713

errno = old_errno;

1648

1714

return ret_errno;

1649

1715

}

1650

network.ifr_flags |= IFF_UP;

1716

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

1651

1717

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1718

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

1719

if(sd == -1){

1654

1720

ret_errno = errno;

1655

1721

perror_plus("socket");

1656

1722

errno = old_errno;

1657

1723

return ret_errno;

1658

1724

}

1659

1725

1660

1726

if(quit_now){

1661

close(sd);

1727

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

1728

if(ret == -1){

1729

perror_plus("close");

1730

}

1662

1731

errno = old_errno;

1663

1732

return EINTR;

1664

1733

}

1668

1737

interface);

1669

1738

}

1670

1739

1671

/* Raise priviliges */

1672

raise_privileges();

1740

/* Raise privileges */

1741

ret_errno = raise_privileges();

1742

if(ret_errno != 0){

1743

errno = ret_errno;

1744

perror_plus("Failed to raise privileges");

1745

}

1673

1746

1674

1747

#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");

1748

int ret_linux;

1749

bool restore_loglevel = false;

1750

if(ret_errno == 0){

1751

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1752

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

1753

ret_linux = klogctl(8, NULL, 5);

1754

if(ret_linux == -1){

1755

perror_plus("klogctl");

1756

} else {

1757

restore_loglevel = true;

1758

}

1682

1759

}

1683

1760

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1761

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

1762

ioctl_errno = errno;

1686

1763

#ifdef __linux__

1687

1764

if(restore_loglevel){

1688

1765

ret_linux = klogctl(7, NULL, 0);

1692

1769

}

1693

1770

#endif /* __linux__ */

1694

1771

1695

/* Lower privileges */

1696

lower_privileges();

1772

/* If raise_privileges() succeeded above */

1773

if(ret_errno == 0){

1774

/* Lower privileges */

1775

ret_errno = lower_privileges();

1776

if(ret_errno != 0){

1777

errno = ret_errno;

1778

perror_plus("Failed to lower privileges");

1779

}

1780

}

1697

1781

1698

1782

/* Close the socket */

1699

1783

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

1702

1786

}

1703

1787

1704

1788

if(ret_setflags == -1){

1705

errno = ret_errno;

1789

errno = ioctl_errno;

1706

1790

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

1791

errno = old_errno;

1708

return ret_errno;

1792

return ioctl_errno;

1709

1793

}

1710

1794

} else if(debug){

1711

1795

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

1729

1813

return 0;

1730

1814

}

1731

1815

1816

__attribute__((nonnull, warn_unused_result))

1732

1817

error_t take_down_interface(const char *const interface){

1733

1818

error_t old_errno = errno;

1734

1819

struct ifreq network;

1739

1824

return ENXIO;

1740

1825

}

1741

1826

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1827

error_t ret_errno = 0, ioctl_errno = 0;

1743

1828

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

1744

1829

ret_errno = errno;

1745

1830

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

1746

1831

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

1832

errno = old_errno;

1747

1833

return ret_errno;

1748

1834

}

1749

1835

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

1750

1836

1751

1837

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

1752

if(sd < 0){

1838

if(sd == -1){

1753

1839

ret_errno = errno;

1754

1840

perror_plus("socket");

1755

1841

errno = old_errno;

1761

1847

interface);

1762

1848

}

1763

1849

1764

/* Raise priviliges */

1765

raise_privileges();

1850

/* Raise privileges */

1851

ret_errno = raise_privileges();

1852

if(ret_errno != 0){

1853

errno = ret_errno;

1854

perror_plus("Failed to raise privileges");

1855

}

1766

1856

1767

1857

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

1768

ret_errno = errno;

1858

ioctl_errno = errno;

1769

1859

1770

/* Lower privileges */

1771

lower_privileges();

1860

/* If raise_privileges() succeeded above */

1861

if(ret_errno == 0){

1862

/* Lower privileges */

1863

ret_errno = lower_privileges();

1864

if(ret_errno != 0){

1865

errno = ret_errno;

1866

perror_plus("Failed to lower privileges");

1867

}

1868

}

1772

1869

1773

1870

/* Close the socket */

1774

1871

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

1777

1874

}

1778

1875

1779

1876

if(ret_setflags == -1){

1780

errno = ret_errno;

1877

errno = ioctl_errno;

1781

1878

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

1879

errno = old_errno;

1783

return ret_errno;

1880

return ioctl_errno;

1784

1881

}

1785

1882

} else if(debug){

1786

1883

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

1794

1891

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

1795

1892

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

1796

1893

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

1797

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

1894

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

1798

1895

.interfaces = NULL, .interfaces_size = 0 };

1799

1896

AvahiSServiceBrowser *sb = NULL;

1800

1897

error_t ret_errno;

1804

1901

int exitcode = EXIT_SUCCESS;

1805

1902

char *interfaces_to_take_down = NULL;

1806

1903

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

1904

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

1905

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

1906

char *tempdir = NULL;

1809

1907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1908

const char *seckey = PATHDIR "/" SECKEY;

1811

1909

const char *pubkey = PATHDIR "/" PUBKEY;

1993

2091

/* Work around Debian bug #633582:

1994

2092

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

1995

2093

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2094

/* Re-raise privileges */

2095

ret_errno = raise_privileges();

2096

if(ret_errno != 0){

2097

errno = ret_errno;

2098

perror_plus("Failed to raise privileges");

2099

} else {

1998

2100

struct stat st;

1999

2101

2000

2102

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

2040

2142

}

2041

2143

2042

2144

/* Lower privileges */

2043

lower_privileges();

2145

ret_errno = lower_privileges();

2146

if(ret_errno != 0){

2147

errno = ret_errno;

2148

perror_plus("Failed to lower privileges");

2149

}

2044

2150

}

2045

2151

}

2046

2152

2072

2178

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

2073

2179

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

2074

2180

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2181

run_network_hooks("start", interfaces_hooks != NULL ?

2182

interfaces_hooks : "", delay);

2079

2183

}

2080

2184

2081

2185

if(not debug){

2159

2263

2160

2264

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

2161

2265

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2266

struct dirent **direntries = NULL;

2163

2267

/* Look for any good interfaces */

2164

2268

ret = scandir(sys_class_net, &direntries, good_interface,

2165

2269

alphasort);

2180

2284

}

2181

2285

free(direntries);

2182

2286

} else {

2183

free(direntries);

2287

if(ret == 0){

2288

free(direntries);

2289

}

2184

2290

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

2185

2291

exitcode = EXIT_FAILURE;

2186

2292

goto end;

2209

2315

break;

2210

2316

}

2211

2317

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2318

errno = bring_up_interface(interface, delay);

2213

2319

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2320

if(errno != 0){

2216

2321

perror_plus("Failed to bring up interface");

2217

2322

} 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;

2323

errno = argz_add(&interfaces_to_take_down,

2324

&interfaces_to_take_down_size,

2325

interface);

2326

if(errno != 0){

2223

2327

perror_plus("argz_add");

2224

2328

}

2225

2329

}

2256

2360

goto end;

2257

2361

}

2258

2362

2259

if(mkdtemp(tempdir) == NULL){

2363

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

2364

tempdir = mkdtemp(run_tempdir);

2365

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

2366

if(debug){

2367

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

2368

run_tempdir, old_tempdir);

2369

}

2370

tempdir = mkdtemp(old_tempdir);

2371

}

2372

if(tempdir == NULL){

2260

2373

perror_plus("mkdtemp");

2261

2374

goto end;

2262

2375

}

2263

tempdir_created = true;

2264

2376

2265

2377

if(quit_now){

2266

2378

goto end;

2402

2514

if(debug){

2403

2515

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

2404

2516

}

2405

2517

2406

2518

ret = avahi_loop_with_timeout(simple_poll,

2407

2519

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

2408

2520

if(debug){

2444

2556

mc.current_server->prev->next = NULL;

2445

2557

while(mc.current_server != NULL){

2446

2558

server *next = mc.current_server->next;

2559

#ifdef __GNUC__

2560

#pragma GCC diagnostic push

2561

#pragma GCC diagnostic ignored "-Wcast-qual"

2562

#endif

2563

free((char *)(mc.current_server->ip));

2564

#ifdef __GNUC__

2565

#pragma GCC diagnostic pop

2566

#endif

2447

2567

free(mc.current_server);

2448

2568

mc.current_server = next;

2449

2569

}

2450

2570

}

2451

2571

2452

/* Re-raise priviliges */

2572

/* Re-raise privileges */

2453

2573

{

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();

2574

ret_errno = raise_privileges();

2575

if(ret_errno != 0){

2576

errno = ret_errno;

2577

perror_plus("Failed to raise privileges");

2578

} else {

2579

2580

/* Run network hooks */

2581

run_network_hooks("stop", interfaces_hooks != NULL ?

2582

interfaces_hooks : "", delay);

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

while((interface=argz_next(interfaces_to_take_down,

2588

interfaces_to_take_down_size,

2589

interface))){

2590

ret_errno = take_down_interface(interface);

2591

if(ret_errno != 0){

2592

errno = ret_errno;

2593

perror_plus("Failed to take down interface");

2594

}

2595

}

2596

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

2597

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

2598

" down\n");

2599

}

2600

}

2601

}

2602

2603

ret_errno = lower_privileges_permanently();

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to lower privileges permanently");

2607

}

2479

2608

}

2480

2609

2481

2610

free(interfaces_to_take_down);

2482

2611

free(interfaces_hooks);

2483

2612

2484

2613

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

2485

if(tempdir_created){

2614

if(tempdir != NULL){

2486

2615

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);

2616

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

2617

O_NOFOLLOW));

2618

if(tempdir_fd == -1){

2619

perror_plus("open");

2620

} else {

2621

#ifdef __GLIBC__

2622

#if __GLIBC_PREREQ(2, 15)

2623

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

2624

notdotentries, alphasort);

2625

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

2626

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

2627

alphasort);

2628

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

2629

#else /* not __GLIBC__ */

2630

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

2631

alphasort);

2632

#endif /* not __GLIBC__ */

2633

if(numentries >= 0){

2634

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

2635

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

2636

if(ret == -1){

2637

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

2638

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

2639

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

2640

}

2641

}

2642

2643

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

2644

free(direntries);

2645

if(numentries == -1){

2646

perror_plus("scandir");

2647

}

2648

ret = rmdir(tempdir);

2649

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

2650

perror_plus("rmdir");

2651

}

2506

2652

}

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");

2653

TEMP_FAILURE_RETRY(close(tempdir_fd));

2517

2654

}

2518

2655

}

2519

2656