/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;

234

230

.af = af };

235

231

if(new_server->ip == NULL){

236

232

perror_plus("strdup");

237

free(new_server);

238

233

return false;

239

234

}

240

235

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

241

236

if(ret == -1){

242

237

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);

252

238

return false;

253

239

}

254

240

/* Special case of first server */

256

242

new_server->next = new_server;

257

243

new_server->prev = new_server;

258

244

*current_server = new_server;

245

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

259

246

} else {

260

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

261

247

new_server->next = *current_server;

262

248

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

263

249

new_server->prev->next = new_server;

269

255

/*

270

256

* Initialize GPGME.

271

257

*/

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){

258

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

259

const char *tempdir, mandos_context *mc){

277

260

gpgme_error_t rc;

278

261

gpgme_engine_info_t engine_info;

279

262

280

263

/*

281

264

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

282

265

*/

283

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

284

267

int ret;

285

268

int fd;

286

269

gpgme_data_t pgp_data;

367

350

* Decrypt OpenPGP data.

368

351

* Returns -1 on error

369

352

*/

370

__attribute__((nonnull, warn_unused_result))

371

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

354

size_t crypto_size,

373

355

char **plaintext,

493

475

return plaintext_length;

494

476

}

495

477

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

498

479

const char *ret = gnutls_strerror(value);

499

480

if(ret == NULL)

500

481

ret = "(unknown)";

502

483

}

503

484

504

485

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

486

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

507

487

const char* string){

508

488

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

509

489

}

510

490

511

__attribute__((nonnull, warn_unused_result))

512

491

static int init_gnutls_global(const char *pubkeyfilename,

513

492

const char *seckeyfilename,

514

493

mandos_context *mc){

588

567

return -1;

589

568

}

590

569

591

__attribute__((nonnull, warn_unused_result))

592

570

static int init_gnutls_session(gnutls_session_t *session,

593

571

mandos_context *mc){

594

572

int ret;

651

629

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

652

630

653

631

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

632

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

656

633

AvahiIfIndex if_index,

657

634

int af, mandos_context *mc){

763

740

goto mandos_end;

764

741

}

765

742

if(af == AF_INET6){

766

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

743

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

767

744

if(IN6_IS_ADDR_LINKLOCAL

768

745

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

769

746

if(if_index == AVAHI_IF_UNSPEC){

1053

1030

return retval;

1054

1031

}

1055

1032

1056

__attribute__((nonnull))

1057

1033

static void resolve_callback(AvahiSServiceResolver *r,

1058

1034

AvahiIfIndex interface,

1059

1035

AvahiProtocol proto,

1067

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

1045

flags,

1070

void *mc){

1046

void* mc){

1071

1047

if(r == NULL){

1072

1048

return;

1073

1049

}

1076

1052

timed out */

1077

1053

1078

1054

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1055

return;

1081

1056

}

1082

1057

1127

1102

const char *domain,

1128

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1104

flags,

1130

void *mc){

1105

void* mc){

1131

1106

if(b == NULL){

1132

1107

return;

1133

1108

}

1193

1168

errno = old_errno;

1194

1169

}

1195

1170

1196

__attribute__((nonnull, warn_unused_result))

1197

1171

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

1198

1172

int ret;

1199

1173

error_t ret_errno;

1218

1192

return true;

1219

1193

}

1220

1194

1221

__attribute__((nonnull, warn_unused_result))

1222

1195

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

1223

1196

1224

1197

/* Reject the loopback device */

1266

1239

* corresponds to an acceptable network device.

1267

1240

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

1268

1241

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1242

int good_interface(const struct dirent *if_entry){

1271

1243

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

1272

1244

return 0;

1290

1262

/*

1291

1263

* This function determines if a network interface is up.

1292

1264

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

1265

bool interface_is_up(const char *interface){

1295

1266

struct ifreq ifr;

1296

1267

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

1307

1278

/*

1308

1279

* This function determines if a network interface is running

1309

1280

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

1281

bool interface_is_running(const char *interface){

1312

1282

struct ifreq ifr;

1313

1283

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

1321

1291

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

1322

1292

}

1323

1293

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

1294

int notdotentries(const struct dirent *direntry){

1326

1295

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

1327

1296

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

1334

1303

}

1335

1304

1336

1305

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1306

int runnable_hook(const struct dirent *direntry){

1339

1307

int ret;

1340

1308

size_t sret;

1348

1316

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

1349

1317

"abcdefghijklmnopqrstuvwxyz"

1350

1318

"0123456789"

1351

"_.-");

1319

"_-");

1352

1320

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

1353

1321

/* Contains non-allowed characters */

1354

1322

if(debug){

1358

1326

return 0;

1359

1327

}

1360

1328

1361

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);

1362

1337

if(ret == -1){

1363

1338

if(debug){

1364

1339

perror_plus("Could not stat hook");

1388

1363

return 1;

1389

1364

}

1390

1365

1391

__attribute__((nonnull, warn_unused_result))

1392

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

1367

mandos_context *mc){

1394

1368

int ret;

1463

1437

}

1464

1438

1465

1439

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

1466

__attribute__((warn_unused_result))

1467

1440

error_t raise_privileges(void){

1468

1441

error_t old_errno = errno;

1469

1442

error_t ret_errno = 0;

1470

1443

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

1471

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1472

1446

}

1473

1447

errno = old_errno;

1474

1448

return ret_errno;

1475

1449

}

1476

1450

1477

1451

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

1478

__attribute__((warn_unused_result))

1479

1452

error_t raise_privileges_permanently(void){

1480

1453

error_t old_errno = errno;

1481

1454

error_t ret_errno = raise_privileges();

1485

1458

}

1486

1459

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

1487

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1488

1462

}

1489

1463

errno = old_errno;

1490

1464

return ret_errno;

1491

1465

}

1492

1466

1493

1467

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

1494

__attribute__((warn_unused_result))

1495

1468

error_t lower_privileges(void){

1496

1469

error_t old_errno = errno;

1497

1470

error_t ret_errno = 0;

1498

1471

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

1499

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1500

1474

}

1501

1475

errno = old_errno;

1502

1476

return ret_errno;

1503

1477

}

1504

1478

1505

1479

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

1480

error_t lower_privileges_permanently(void){

1508

1481

error_t old_errno = errno;

1509

1482

error_t ret_errno = 0;

1510

1483

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

1511

1484

ret_errno = errno;

1485

perror_plus("setuid");

1512

1486

}

1513

1487

errno = old_errno;

1514

1488

return ret_errno;

1515

1489

}

1516

1490

1517

__attribute__((nonnull))

1518

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

1491

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

1519

1492

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1547

1496

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

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");

1559

1504

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

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){

1621

1514

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

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

}

1626

1573

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

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

}

1673

1585

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

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;

1693

1622

}

1694

1623

1695

__attribute__((nonnull, warn_unused_result))

1696

1624

error_t bring_up_interface(const char *const interface,

1697

1625

const float delay){

1626

int sd = -1;

1698

1627

error_t old_errno = errno;

1699

int ret;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1700

1630

struct ifreq network;

1701

1631

unsigned int if_index = if_nametoindex(interface);

1702

1632

if(if_index == 0){

1711

1641

}

1712

1642

1713

1643

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1644

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

1716

1645

ret_errno = errno;

1717

1646

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

1718

1647

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

1719

errno = old_errno;

1720

1648

return ret_errno;

1721

1649

}

1722

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

1650

network.ifr_flags |= IFF_UP;

1723

1651

1724

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

1725

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1726

1654

ret_errno = errno;

1727

1655

perror_plus("socket");

1728

1656

errno = old_errno;

1729

1657

return ret_errno;

1730

1658

}

1731

1659

1732

1660

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1661

close(sd);

1737

1662

errno = old_errno;

1738

1663

return EINTR;

1739

1664

}

1743

1668

interface);

1744

1669

}

1745

1670

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1671

/* Raise priviliges */

1672

raise_privileges();

1752

1673

1753

1674

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

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");

1765

1682

}

1766

1683

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

1769

1686

#ifdef __linux__

1770

1687

if(restore_loglevel){

1771

1688

ret_linux = klogctl(7, NULL, 0);

1775

1692

}

1776

1693

#endif /* __linux__ */

1777

1694

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1695

/* Lower privileges */

1696

lower_privileges();

1787

1697

1788

1698

/* Close the socket */

1789

1699

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

1792

1702

}

1793

1703

1794

1704

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1705

errno = ret_errno;

1796

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

1707

errno = old_errno;

1798

return ioctl_errno;

1708

return ret_errno;

1799

1709

}

1800

1710

} else if(debug){

1801

1711

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

1819

1729

return 0;

1820

1730

}

1821

1731

1822

__attribute__((nonnull, warn_unused_result))

1823

1732

error_t take_down_interface(const char *const interface){

1824

1733

error_t old_errno = errno;

1825

1734

struct ifreq network;

1830

1739

return ENXIO;

1831

1740

}

1832

1741

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1742

error_t ret_errno = 0;

1834

1743

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

1835

1744

ret_errno = errno;

1836

1745

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

1837

1746

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

1838

errno = old_errno;

1839

1747

return ret_errno;

1840

1748

}

1841

1749

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

1842

1750

1843

1751

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

1844

if(sd == -1){

1752

if(sd < 0){

1845

1753

ret_errno = errno;

1846

1754

perror_plus("socket");

1847

1755

errno = old_errno;

1853

1761

interface);

1854

1762

}

1855

1763

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1764

/* Raise priviliges */

1765

raise_privileges();

1862

1766

1863

1767

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

1864

ioctl_errno = errno;

1768

ret_errno = errno;

1865

1769

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1770

/* Lower privileges */

1771

lower_privileges();

1875

1772

1876

1773

/* Close the socket */

1877

1774

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

1880

1777

}

1881

1778

1882

1779

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1780

errno = ret_errno;

1884

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

1782

errno = old_errno;

1886

return ioctl_errno;

1783

return ret_errno;

1887

1784

}

1888

1785

} else if(debug){

1889

1786

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

1897

1794

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

1898

1795

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

1899

1796

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

1900

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

1797

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

1901

1798

.interfaces = NULL, .interfaces_size = 0 };

1902

1799

AvahiSServiceBrowser *sb = NULL;

1903

1800

error_t ret_errno;

1907

1804

int exitcode = EXIT_SUCCESS;

1908

1805

char *interfaces_to_take_down = NULL;

1909

1806

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

1913

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

1810

const char *seckey = PATHDIR "/" SECKEY;

1915

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2097

1993

/* Work around Debian bug #633582:

2098

1994

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

2099

1995

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2106

1998

struct stat st;

2107

1999

2108

2000

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

2148

2040

}

2149

2041

2150

2042

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2043

lower_privileges();

2156

2044

}

2157

2045

}

2158

2046

2184

2072

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

2185

2073

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

2186

2074

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2189

2079

}

2190

2080

2191

2081

if(not debug){

2269

2159

2270

2160

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

2271

2161

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2162

struct dirent **direntries;

2273

2163

/* Look for any good interfaces */

2274

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2275

2165

alphasort);

2281

2171

if(ret_errno != 0){

2282

2172

errno = ret_errno;

2283

2173

perror_plus("argz_add");

2284

free(direntries[i]);

2285

2174

continue;

2286

2175

}

2287

2176

if(debug){

2288

2177

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2289

2178

direntries[i]->d_name);

2290

2179

}

2291

free(direntries[i]);

2292

2180

}

2293

2181

free(direntries);

2294

2182

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2183

free(direntries);

2298

2184

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

2299

2185

exitcode = EXIT_FAILURE;

2300

2186

goto end;

2323

2209

break;

2324

2210

}

2325

2211

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2327

2213

if(not interface_was_up){

2328

if(errno != 0){

2214

if(ret != 0){

2215

errno = ret;

2329

2216

perror_plus("Failed to bring up interface");

2330

2217

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

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;

2335

2223

perror_plus("argz_add");

2336

2224

}

2337

2225

}

2368

2256

goto end;

2369

2257

}

2370

2258

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2381

2260

perror_plus("mkdtemp");

2382

2261

goto end;

2383

2262

}

2263

tempdir_created = true;

2384

2264

2385

2265

if(quit_now){

2386

2266

goto end;

2522

2402

if(debug){

2523

2403

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

2524

2404

}

2525

2405

2526

2406

ret = avahi_loop_with_timeout(simple_poll,

2527

2407

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

2528

2408

if(debug){

2564

2444

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

2565

2445

while(mc.current_server != NULL){

2566

2446

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2575

2447

free(mc.current_server);

2576

2448

mc.current_server = next;

2577

2449

}

2578

2450

}

2579

2451

2580

/* Re-raise privileges */

2452

/* Re-raise priviliges */

2581

2453

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

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();

2616

2479

}

2617

2480

2618

2481

free(interfaces_to_take_down);

2619

2482

free(interfaces_hooks);

2620

2483

2621

2484

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

2622

if(tempdir != NULL){

2485

if(tempdir_created){

2623

2486

struct dirent **direntries = NULL;

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

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);

2661

2506

}

2662

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");

2663

2517

}

2664

2518

}

2665

2519