/mandos/trunk : revision 668

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

free(new_server->ip);

244

free(new_server);

245

238

return false;

246

239

}

247

240

/* Special case of first server */

249

242

new_server->next = new_server;

250

243

new_server->prev = new_server;

251

244

*current_server = new_server;

245

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

252

246

} else {

253

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

254

247

new_server->next = *current_server;

255

248

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

256

249

new_server->prev->next = new_server;

262

255

/*

263

256

* Initialize GPGME.

264

257

*/

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

258

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

259

const char *tempdir, mandos_context *mc){

270

260

gpgme_error_t rc;

271

261

gpgme_engine_info_t engine_info;

272

262

273

263

/*

274

264

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

275

265

*/

276

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

277

267

int ret;

278

268

int fd;

279

269

gpgme_data_t pgp_data;

360

350

* Decrypt OpenPGP data.

361

351

* Returns -1 on error

362

352

*/

363

__attribute__((nonnull, warn_unused_result))

364

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

354

size_t crypto_size,

366

355

char **plaintext,

486

475

return plaintext_length;

487

476

}

488

477

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

491

479

const char *ret = gnutls_strerror(value);

492

480

if(ret == NULL)

493

481

ret = "(unknown)";

495

483

}

496

484

497

485

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

486

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

500

487

const char* string){

501

488

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

502

489

}

503

490

504

__attribute__((nonnull, warn_unused_result))

505

491

static int init_gnutls_global(const char *pubkeyfilename,

506

492

const char *seckeyfilename,

507

493

mandos_context *mc){

581

567

return -1;

582

568

}

583

569

584

__attribute__((nonnull, warn_unused_result))

585

570

static int init_gnutls_session(gnutls_session_t *session,

586

571

mandos_context *mc){

587

572

int ret;

644

629

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

645

630

646

631

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

648

632

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

649

633

AvahiIfIndex if_index,

650

634

int af, mandos_context *mc){

651

635

int ret, tcp_sd = -1;

652

636

ssize_t sret;

653

struct sockaddr_storage to;

637

union {

638

struct sockaddr_in in;

639

struct sockaddr_in6 in6;

640

} to;

654

641

char *buffer = NULL;

655

642

char *decrypted_buffer = NULL;

656

643

size_t buffer_length = 0;

737

724

738

725

memset(&to, 0, sizeof(to));

739

726

if(af == AF_INET6){

740

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

741

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

727

to.in6.sin6_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &to.in6.sin6_addr);

742

729

} else { /* IPv4 */

743

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

744

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

730

to.in.sin_family = (sa_family_t)af;

731

ret = inet_pton(af, ip, &to.in.sin_addr);

745

732

}

746

733

if(ret < 0 ){

747

734

int e = errno;

756

743

goto mandos_end;

757

744

}

758

745

if(af == AF_INET6){

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

762

756

if(if_index == AVAHI_IF_UNSPEC){

763

757

fprintf_plus(stderr, "An IPv6 link-local address is"

764

758

" incomplete without a network interface\n");

766

760

goto mandos_end;

767

761

}

768

762

/* Set the network interface number as scope */

769

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

763

to.in6.sin6_scope_id = (uint32_t)if_index;

770

764

}

771

765

} else {

772

((struct sockaddr_in *)&to)->sin_port = htons(port);

766

to.in.sin_port = htons(port);

773

767

}

774

768

775

769

if(quit_now){

793

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

795

789

if(af == AF_INET6){

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in6),

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

798

791

addrstr, sizeof(addrstr), NULL, 0,

799

792

NI_NUMERICHOST);

800

793

} else {

801

ret = getnameinfo((struct sockaddr *)&to,

802

sizeof(struct sockaddr_in),

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

803

795

addrstr, sizeof(addrstr), NULL, 0,

804

796

NI_NUMERICHOST);

805

797

}

818

810

}

819

811

820

812

if(af == AF_INET6){

821

ret = connect(tcp_sd, (struct sockaddr *)&to,

822

sizeof(struct sockaddr_in6));

813

ret = connect(tcp_sd, &to.in6, sizeof(to));

823

814

} else {

824

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

825

sizeof(struct sockaddr_in));

815

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

826

816

}

827

817

if(ret < 0){

828

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

818

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

829

819

int e = errno;

830

820

perror_plus("connect");

831

821

errno = e;

1046

1036

return retval;

1047

1037

}

1048

1038

1049

__attribute__((nonnull))

1050

1039

static void resolve_callback(AvahiSServiceResolver *r,

1051

1040

AvahiIfIndex interface,

1052

1041

AvahiProtocol proto,

1060

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1051

flags,

1063

void *mc){

1052

void* mc){

1064

1053

if(r == NULL){

1065

1054

return;

1066

1055

}

1119

1108

const char *domain,

1120

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

1110

flags,

1122

void *mc){

1111

void* mc){

1123

1112

if(b == NULL){

1124

1113

return;

1125

1114

}

1185

1174

errno = old_errno;

1186

1175

}

1187

1176

1188

__attribute__((nonnull, warn_unused_result))

1189

1177

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

1190

1178

int ret;

1191

1179

error_t ret_errno;

1210

1198

return true;

1211

1199

}

1212

1200

1213

__attribute__((nonnull, warn_unused_result))

1214

1201

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

1215

1202

1216

1203

/* Reject the loopback device */

1258

1245

* corresponds to an acceptable network device.

1259

1246

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

1260

1247

*/

1261

__attribute__((nonnull, warn_unused_result))

1262

1248

int good_interface(const struct dirent *if_entry){

1263

1249

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

1264

1250

return 0;

1282

1268

/*

1283

1269

* This function determines if a network interface is up.

1284

1270

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

1271

bool interface_is_up(const char *interface){

1287

1272

struct ifreq ifr;

1288

1273

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

1299

1284

/*

1300

1285

* This function determines if a network interface is running

1301

1286

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

1287

bool interface_is_running(const char *interface){

1304

1288

struct ifreq ifr;

1305

1289

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

1313

1297

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

1314

1298

}

1315

1299

1316

__attribute__((nonnull, pure, warn_unused_result))

1317

1300

int notdotentries(const struct dirent *direntry){

1318

1301

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

1319

1302

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

1326

1309

}

1327

1310

1328

1311

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

1329

__attribute__((nonnull, warn_unused_result))

1330

1312

int runnable_hook(const struct dirent *direntry){

1331

1313

int ret;

1332

1314

size_t sret;

1340

1322

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

1341

1323

"abcdefghijklmnopqrstuvwxyz"

1342

1324

"0123456789"

1343

"_.-");

1325

"_-");

1344

1326

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

1345

1327

/* Contains non-allowed characters */

1346

1328

if(debug){

1350

1332

return 0;

1351

1333

}

1352

1334

1353

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

1335

char *fullname = NULL;

1336

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1337

if(ret < 0){

1338

perror_plus("asprintf");

1339

return 0;

1340

}

1341

1342

ret = stat(fullname, &st);

1354

1343

if(ret == -1){

1355

1344

if(debug){

1356

1345

perror_plus("Could not stat hook");

1380

1369

return 1;

1381

1370

}

1382

1371

1383

__attribute__((nonnull, warn_unused_result))

1384

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

1373

mandos_context *mc){

1386

1374

int ret;

1390

1378

1391

1379

while(true){

1392

1380

if(mc->current_server == NULL){

1393

if(debug){

1381

if (debug){

1394

1382

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

1395

1383

" No timeout!\n");

1396

1384

}

1397

1385

ret = avahi_simple_poll_iterate(s, -1);

1398

1386

} else {

1399

if(debug){

1387

if (debug){

1400

1388

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

1401

1389

" it, or wait\n");

1402

1390

}

1419

1407

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

1420

1408

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

1421

1409

1422

if(debug){

1410

if (debug){

1423

1411

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

1424

1412

block_time);

1425

1413

}

1447

1435

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

1448

1436

}

1449

1437

if(ret != 0){

1450

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

1438

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

1451

1439

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

1452

1440

}

1453

1441

}

1455

1443

}

1456

1444

1457

1445

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

1458

__attribute__((warn_unused_result))

1459

1446

error_t raise_privileges(void){

1460

1447

error_t old_errno = errno;

1461

1448

error_t ret_errno = 0;

1462

1449

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

1463

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1464

1452

}

1465

1453

errno = old_errno;

1466

1454

return ret_errno;

1467

1455

}

1468

1456

1469

1457

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

1470

__attribute__((warn_unused_result))

1471

1458

error_t raise_privileges_permanently(void){

1472

1459

error_t old_errno = errno;

1473

1460

error_t ret_errno = raise_privileges();

1477

1464

}

1478

1465

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

1479

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1480

1468

}

1481

1469

errno = old_errno;

1482

1470

return ret_errno;

1483

1471

}

1484

1472

1485

1473

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

1486

__attribute__((warn_unused_result))

1487

1474

error_t lower_privileges(void){

1488

1475

error_t old_errno = errno;

1489

1476

error_t ret_errno = 0;

1490

1477

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

1491

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1492

1480

}

1493

1481

errno = old_errno;

1494

1482

return ret_errno;

1495

1483

}

1496

1484

1497

1485

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

1486

error_t lower_privileges_permanently(void){

1500

1487

error_t old_errno = errno;

1501

1488

error_t ret_errno = 0;

1502

1489

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

1503

1490

ret_errno = errno;

1491

perror_plus("setuid");

1504

1492

}

1505

1493

errno = old_errno;

1506

1494

return ret_errno;

1507

1495

}

1508

1496

1509

__attribute__((nonnull))

1510

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

1497

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

1511

1498

const float delay){

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1539

1502

if(numhooks == -1){

1540

perror_plus("scandir");

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1551

1510

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

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

1515

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

1516

direntry = direntries[i];

1517

char *fullname = NULL;

1518

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1519

if(ret < 0){

1613

1520

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1521

continue;

1522

}

1523

if(debug){

1524

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

1525

direntry->d_name);

1526

}

1527

pid_t hook_pid = fork();

1528

if(hook_pid == 0){

1529

/* Child */

1530

/* Raise privileges */

1531

raise_privileges_permanently();

1532

/* Set group */

1533

errno = 0;

1534

ret = setgid(0);

1535

if(ret == -1){

1536

perror_plus("setgid");

1537

}

1538

/* Reset supplementary groups */

1539

errno = 0;

1540

ret = setgroups(0, NULL);

1541

if(ret == -1){

1542

perror_plus("setgroups");

1543

}

1544

dup2(devnull, STDIN_FILENO);

1545

close(devnull);

1546

dup2(STDERR_FILENO, STDOUT_FILENO);

1547

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

1548

if(ret == -1){

1549

perror_plus("setenv");

1550

_exit(EX_OSERR);

1551

}

1552

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

1553

if(ret == -1){

1554

perror_plus("setenv");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("setenv");

1560

_exit(EX_OSERR);

1561

}

1562

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

1563

if(ret == -1){

1564

perror_plus("setenv");

1565

_exit(EX_OSERR);

1566

}

1567

char *delaystring;

1568

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

1569

if(ret == -1){

1570

perror_plus("asprintf");

1571

_exit(EX_OSERR);

1572

}

1573

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

1574

if(ret == -1){

1575

free(delaystring);

1576

perror_plus("setenv");

1577

_exit(EX_OSERR);

1578

}

1618

1579

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1662

1591

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1592

int status;

1593

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

1594

perror_plus("waitpid");

1595

free(fullname);

1596

continue;

1597

}

1598

if(WIFEXITED(status)){

1599

if(WEXITSTATUS(status) != 0){

1600

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

1601

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

1602

WEXITSTATUS(status));

1603

free(fullname);

1604

continue;

1605

}

1606

} else if(WIFSIGNALED(status)){

1607

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

1608

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

1609

WTERMSIG(status));

1610

free(fullname);

1611

continue;

1612

} else {

1613

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

1614

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

1615

free(fullname);

1616

continue;

1617

}

1618

}

1619

free(fullname);

1620

if(debug){

1621

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

1622

direntry->d_name);

1623

}

1624

}

1625

close(devnull);

1626

}

1627

return true;

1680

1628

}

1681

1629

1682

__attribute__((nonnull, warn_unused_result))

1683

1630

error_t bring_up_interface(const char *const interface,

1684

1631

const float delay){

1632

int sd = -1;

1685

1633

error_t old_errno = errno;

1686

int ret;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1687

1636

struct ifreq network;

1688

1637

unsigned int if_index = if_nametoindex(interface);

1689

1638

if(if_index == 0){

1698

1647

}

1699

1648

1700

1649

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1650

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

1703

1651

ret_errno = errno;

1704

1652

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

1705

1653

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

1706

errno = old_errno;

1707

1654

return ret_errno;

1708

1655

}

1709

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

1656

network.ifr_flags |= IFF_UP;

1710

1657

1711

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

1712

if(sd == -1){

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1713

1660

ret_errno = errno;

1714

1661

perror_plus("socket");

1715

1662

errno = old_errno;

1716

1663

return ret_errno;

1717

1664

}

1718

1665

1719

1666

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1667

close(sd);

1724

1668

errno = old_errno;

1725

1669

return EINTR;

1726

1670

}

1730

1674

interface);

1731

1675

}

1732

1676

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1677

/* Raise priviliges */

1678

raise_privileges();

1739

1679

1740

1680

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

int ret_linux = klogctl(8, NULL, 5);

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1752

1688

}

1753

1689

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1690

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

1691

ret_errno = errno;

1756

1692

#ifdef __linux__

1757

1693

if(restore_loglevel){

1758

1694

ret_linux = klogctl(7, NULL, 0);

1762

1698

}

1763

1699

#endif /* __linux__ */

1764

1700

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1701

/* Lower privileges */

1702

lower_privileges();

1774

1703

1775

1704

/* Close the socket */

1776

1705

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

1779

1708

}

1780

1709

1781

1710

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1711

errno = ret_errno;

1783

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

1713

errno = old_errno;

1785

return ioctl_errno;

1714

return ret_errno;

1786

1715

}

1787

1716

} else if(debug){

1788

1717

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

1806

1735

return 0;

1807

1736

}

1808

1737

1809

__attribute__((nonnull, warn_unused_result))

1810

1738

error_t take_down_interface(const char *const interface){

1811

1739

error_t old_errno = errno;

1812

1740

struct ifreq network;

1817

1745

return ENXIO;

1818

1746

}

1819

1747

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1748

error_t ret_errno = 0;

1821

1749

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

1822

1750

ret_errno = errno;

1823

1751

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

1824

1752

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

1825

errno = old_errno;

1826

1753

return ret_errno;

1827

1754

}

1828

1755

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

1829

1756

1830

1757

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

1831

if(sd == -1){

1758

if(sd < 0){

1832

1759

ret_errno = errno;

1833

1760

perror_plus("socket");

1834

1761

errno = old_errno;

1840

1767

interface);

1841

1768

}

1842

1769

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1770

/* Raise priviliges */

1771

raise_privileges();

1849

1772

1850

1773

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

1851

ioctl_errno = errno;

1774

ret_errno = errno;

1852

1775

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1776

/* Lower privileges */

1777

lower_privileges();

1862

1778

1863

1779

/* Close the socket */

1864

1780

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

1867

1783

}

1868

1784

1869

1785

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1786

errno = ret_errno;

1871

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

1788

errno = old_errno;

1873

return ioctl_errno;

1789

return ret_errno;

1874

1790

}

1875

1791

} else if(debug){

1876

1792

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

1884

1800

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

1885

1801

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

1886

1802

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

1887

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

1803

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

1888

1804

.interfaces = NULL, .interfaces_size = 0 };

1889

1805

AvahiSServiceBrowser *sb = NULL;

1890

1806

error_t ret_errno;

1894

1810

int exitcode = EXIT_SUCCESS;

1895

1811

char *interfaces_to_take_down = NULL;

1896

1812

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1813

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

1814

bool tempdir_created = false;

1900

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1816

const char *seckey = PATHDIR "/" SECKEY;

1902

1817

const char *pubkey = PATHDIR "/" PUBKEY;

2084

1999

/* Work around Debian bug #633582:

2085

2000

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

2086

2001

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2093

2004

struct stat st;

2094

2005

2095

2006

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

2135

2046

}

2136

2047

2137

2048

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2049

lower_privileges();

2143

2050

}

2144

2051

}

2145

2052

2171

2078

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

2172

2079

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

2173

2080

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2176

2085

}

2177

2086

2178

2087

if(not debug){

2256

2165

2257

2166

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

2258

2167

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2168

struct dirent **direntries;

2260

2169

/* Look for any good interfaces */

2261

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2262

2171

alphasort);

2277

2186

}

2278

2187

free(direntries);

2279

2188

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2189

free(direntries);

2283

2190

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

2284

2191

exitcode = EXIT_FAILURE;

2285

2192

goto end;

2308

2215

break;

2309

2216

}

2310

2217

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2218

ret = bring_up_interface(interface, delay);

2312

2219

if(not interface_was_up){

2313

if(errno != 0){

2220

if(ret != 0){

2221

errno = ret;

2314

2222

perror_plus("Failed to bring up interface");

2315

2223

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2320

2229

perror_plus("argz_add");

2321

2230

}

2322

2231

}

2353

2262

goto end;

2354

2263

}

2355

2264

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2265

if(mkdtemp(tempdir) == NULL){

2366

2266

perror_plus("mkdtemp");

2367

2267

goto end;

2368

2268

}

2269

tempdir_created = true;

2369

2270

2370

2271

if(quit_now){

2371

2272

goto end;

2446

2347

sleep((unsigned int)retry_interval);

2447

2348

}

2448

2349

2449

if(not quit_now){

2350

if (not quit_now){

2450

2351

exitcode = EXIT_SUCCESS;

2451

2352

}

2452

2353

2507

2408

if(debug){

2508

2409

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

2509

2410

}

2510

2411

2511

2412

ret = avahi_loop_with_timeout(simple_poll,

2512

2413

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

2513

2414

if(debug){

2554

2455

}

2555

2456

}

2556

2457

2557

/* Re-raise privileges */

2458

/* Re-raise priviliges */

2558

2459

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2592

}

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2476

}

2477

}

2478

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

2479

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

2480

" down\n");

2481

}

2482

}

2483

2484

lower_privileges_permanently();

2593

2485

}

2594

2486

2595

2487

free(interfaces_to_take_down);

2596

2488

free(interfaces_hooks);

2597

2489

2598

2490

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

2599

if(tempdir != NULL){

2491

if(tempdir_created){

2600

2492

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2493

struct dirent *direntry = NULL;

2494

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

2495

alphasort);

2496

if (numentries > 0){

2497

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

2498

direntry = direntries[i];

2499

char *fullname = NULL;

2500

ret = asprintf(&fullname, "%s/%s", tempdir,

2501

direntry->d_name);

2502

if(ret < 0){

2503

perror_plus("asprintf");

2504

continue;

2505

}

2506

ret = remove(fullname);

2507

if(ret == -1){

2508

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2509

strerror(errno));

2510

}

2511

free(fullname);

2637

2512

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2513

}

2514

2515

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

2516

free(direntries);

2517

if (numentries == -1){

2518

perror_plus("scandir");

2519

}

2520

ret = rmdir(tempdir);

2521

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

2522

perror_plus("rmdir");

2639

2523

}

2640

2524

}

2641

2525