/mandos/trunk : revision 667

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

return false;

239

}

240

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

241

if(ret == -1){

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);

252

233

return false;

253

234

}

254

235

/* Special case of first server */

256

237

new_server->next = new_server;

257

238

new_server->prev = new_server;

258

239

*current_server = new_server;

240

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

259

241

} else {

260

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

261

242

new_server->next = *current_server;

262

243

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

263

244

new_server->prev->next = new_server;

264

245

(*current_server)->prev = new_server;

265

246

}

247

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

248

if(ret == -1){

249

perror_plus("clock_gettime");

250

return false;

251

}

266

252

return true;

267

253

}

268

254

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){

658

635

int ret, tcp_sd = -1;

659

636

ssize_t sret;

660

struct sockaddr_storage to;

637

union {

638

struct sockaddr_in in;

639

struct sockaddr_in6 in6;

640

} to;

661

641

char *buffer = NULL;

662

642

char *decrypted_buffer = NULL;

663

643

size_t buffer_length = 0;

744

724

745

725

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

746

726

if(af == AF_INET6){

747

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

748

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);

749

729

} else { /* IPv4 */

750

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

751

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);

752

732

}

753

733

if(ret < 0 ){

754

734

int e = errno;

763

743

goto mandos_end;

764

744

}

765

745

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

(&((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

769

756

if(if_index == AVAHI_IF_UNSPEC){

770

757

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

771

758

" incomplete without a network interface\n");

773

760

goto mandos_end;

774

761

}

775

762

/* Set the network interface number as scope */

776

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

763

to.in6.sin6_scope_id = (uint32_t)if_index;

777

764

}

778

765

} else {

779

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

766

to.in.sin_port = htons(port);

780

767

}

781

768

782

769

if(quit_now){

800

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

802

789

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

790

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

805

791

addrstr, sizeof(addrstr), NULL, 0,

806

792

NI_NUMERICHOST);

807

793

} else {

808

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

809

sizeof(struct sockaddr_in),

794

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

810

795

addrstr, sizeof(addrstr), NULL, 0,

811

796

NI_NUMERICHOST);

812

797

}

825

810

}

826

811

827

812

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

813

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

830

814

} else {

831

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

832

sizeof(struct sockaddr_in));

815

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

833

816

}

834

817

if(ret < 0){

835

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

818

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

836

819

int e = errno;

837

820

perror_plus("connect");

838

821

errno = e;

1053

1036

return retval;

1054

1037

}

1055

1038

1056

__attribute__((nonnull))

1057

1039

static void resolve_callback(AvahiSServiceResolver *r,

1058

1040

AvahiIfIndex interface,

1059

1041

AvahiProtocol proto,

1067

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

1051

flags,

1070

void *mc){

1052

void* mc){

1071

1053

if(r == NULL){

1072

1054

return;

1073

1055

}

1076

1058

timed out */

1077

1059

1078

1060

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1061

return;

1081

1062

}

1082

1063

1127

1108

const char *domain,

1128

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1110

flags,

1130

void *mc){

1111

void* mc){

1131

1112

if(b == NULL){

1132

1113

return;

1133

1114

}

1193

1174

errno = old_errno;

1194

1175

}

1195

1176

1196

__attribute__((nonnull, warn_unused_result))

1197

1177

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

1198

1178

int ret;

1199

1179

error_t ret_errno;

1218

1198

return true;

1219

1199

}

1220

1200

1221

__attribute__((nonnull, warn_unused_result))

1222

1201

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

1223

1202

1224

1203

/* Reject the loopback device */

1266

1245

* corresponds to an acceptable network device.

1267

1246

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

1268

1247

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1248

int good_interface(const struct dirent *if_entry){

1271

1249

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

1272

1250

return 0;

1290

1268

/*

1291

1269

* This function determines if a network interface is up.

1292

1270

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

1271

bool interface_is_up(const char *interface){

1295

1272

struct ifreq ifr;

1296

1273

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

1307

1284

/*

1308

1285

* This function determines if a network interface is running

1309

1286

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

1287

bool interface_is_running(const char *interface){

1312

1288

struct ifreq ifr;

1313

1289

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

1321

1297

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

1322

1298

}

1323

1299

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

1300

int notdotentries(const struct dirent *direntry){

1326

1301

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

1327

1302

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

1334

1309

}

1335

1310

1336

1311

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1312

int runnable_hook(const struct dirent *direntry){

1339

1313

int ret;

1340

1314

size_t sret;

1348

1322

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

1349

1323

"abcdefghijklmnopqrstuvwxyz"

1350

1324

"0123456789"

1351

"_.-");

1325

"_-");

1352

1326

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

1353

1327

/* Contains non-allowed characters */

1354

1328

if(debug){

1358

1332

return 0;

1359

1333

}

1360

1334

1361

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);

1362

1343

if(ret == -1){

1363

1344

if(debug){

1364

1345

perror_plus("Could not stat hook");

1388

1369

return 1;

1389

1370

}

1390

1371

1391

__attribute__((nonnull, warn_unused_result))

1392

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

1373

mandos_context *mc){

1394

1374

int ret;

1398

1378

1399

1379

while(true){

1400

1380

if(mc->current_server == NULL){

1401

if(debug){

1381

if (debug){

1402

1382

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

1403

1383

" No timeout!\n");

1404

1384

}

1405

1385

ret = avahi_simple_poll_iterate(s, -1);

1406

1386

} else {

1407

if(debug){

1387

if (debug){

1408

1388

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

1409

1389

" it, or wait\n");

1410

1390

}

1427

1407

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

1428

1408

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

1429

1409

1430

if(debug){

1410

if (debug){

1431

1411

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

1432

1412

block_time);

1433

1413

}

1455

1435

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

1456

1436

}

1457

1437

if(ret != 0){

1458

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

1438

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

1459

1439

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

1460

1440

}

1461

1441

}

1463

1443

}

1464

1444

1465

1445

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

1466

__attribute__((warn_unused_result))

1467

1446

error_t raise_privileges(void){

1468

1447

error_t old_errno = errno;

1469

1448

error_t ret_errno = 0;

1470

1449

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

1471

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1472

1452

}

1473

1453

errno = old_errno;

1474

1454

return ret_errno;

1475

1455

}

1476

1456

1477

1457

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

1478

__attribute__((warn_unused_result))

1479

1458

error_t raise_privileges_permanently(void){

1480

1459

error_t old_errno = errno;

1481

1460

error_t ret_errno = raise_privileges();

1485

1464

}

1486

1465

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

1487

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1488

1468

}

1489

1469

errno = old_errno;

1490

1470

return ret_errno;

1491

1471

}

1492

1472

1493

1473

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

1494

__attribute__((warn_unused_result))

1495

1474

error_t lower_privileges(void){

1496

1475

error_t old_errno = errno;

1497

1476

error_t ret_errno = 0;

1498

1477

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

1499

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1500

1480

}

1501

1481

errno = old_errno;

1502

1482

return ret_errno;

1503

1483

}

1504

1484

1505

1485

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

1486

error_t lower_privileges_permanently(void){

1508

1487

error_t old_errno = errno;

1509

1488

error_t ret_errno = 0;

1510

1489

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

1511

1490

ret_errno = errno;

1491

perror_plus("setuid");

1512

1492

}

1513

1493

errno = old_errno;

1514

1494

return ret_errno;

1515

1495

}

1516

1496

1517

__attribute__((nonnull))

1518

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

1497

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

1519

1498

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__ */

1499

struct dirent **direntries;

1500

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

1501

alphasort);

1547

1502

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);

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");

1559

1510

}

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){

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){

1621

1520

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

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

}

1626

1579

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

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

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

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

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

1667

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

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

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

1674

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

1675

WTERMSIG(status));

1676

free(direntry);

1677

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

}

1678

1591

} else {

1679

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

1680

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

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

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

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

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

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

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;

1698

1628

}

1699

1629

1700

__attribute__((nonnull, warn_unused_result))

1701

1630

error_t bring_up_interface(const char *const interface,

1702

1631

const float delay){

1632

int sd = -1;

1703

1633

error_t old_errno = errno;

1704

int ret;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1705

1636

struct ifreq network;

1706

1637

unsigned int if_index = if_nametoindex(interface);

1707

1638

if(if_index == 0){

1716

1647

}

1717

1648

1718

1649

if(not interface_is_up(interface)){

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1650

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

1721

1651

ret_errno = errno;

1722

1652

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

1723

1653

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

1724

errno = old_errno;

1725

1654

return ret_errno;

1726

1655

}

1727

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

1656

network.ifr_flags |= IFF_UP;

1728

1657

1729

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

1730

if(sd == -1){

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1731

1660

ret_errno = errno;

1732

1661

perror_plus("socket");

1733

1662

errno = old_errno;

1734

1663

return ret_errno;

1735

1664

}

1736

1665

1737

1666

if(quit_now){

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1667

close(sd);

1742

1668

errno = old_errno;

1743

1669

return EINTR;

1744

1670

}

1748

1674

interface);

1749

1675

}

1750

1676

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1677

/* Raise priviliges */

1678

raise_privileges();

1757

1679

1758

1680

#ifdef __linux__

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

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

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

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");

1770

1688

}

1771

1689

#endif /* __linux__ */

1772

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

1773

ioctl_errno = errno;

1690

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

1691

ret_errno = errno;

1774

1692

#ifdef __linux__

1775

1693

if(restore_loglevel){

1776

1694

ret_linux = klogctl(7, NULL, 0);

1780

1698

}

1781

1699

#endif /* __linux__ */

1782

1700

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1701

/* Lower privileges */

1702

lower_privileges();

1792

1703

1793

1704

/* Close the socket */

1794

1705

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

1797

1708

}

1798

1709

1799

1710

if(ret_setflags == -1){

1800

errno = ioctl_errno;

1711

errno = ret_errno;

1801

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1802

1713

errno = old_errno;

1803

return ioctl_errno;

1714

return ret_errno;

1804

1715

}

1805

1716

} else if(debug){

1806

1717

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

1824

1735

return 0;

1825

1736

}

1826

1737

1827

__attribute__((nonnull, warn_unused_result))

1828

1738

error_t take_down_interface(const char *const interface){

1829

1739

error_t old_errno = errno;

1830

1740

struct ifreq network;

1835

1745

return ENXIO;

1836

1746

}

1837

1747

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1748

error_t ret_errno = 0;

1839

1749

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

1840

1750

ret_errno = errno;

1841

1751

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

1842

1752

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

1843

errno = old_errno;

1844

1753

return ret_errno;

1845

1754

}

1846

1755

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

1847

1756

1848

1757

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

1849

if(sd == -1){

1758

if(sd < 0){

1850

1759

ret_errno = errno;

1851

1760

perror_plus("socket");

1852

1761

errno = old_errno;

1858

1767

interface);

1859

1768

}

1860

1769

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1770

/* Raise priviliges */

1771

raise_privileges();

1867

1772

1868

1773

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

1869

ioctl_errno = errno;

1774

ret_errno = errno;

1870

1775

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1776

/* Lower privileges */

1777

lower_privileges();

1880

1778

1881

1779

/* Close the socket */

1882

1780

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

1885

1783

}

1886

1784

1887

1785

if(ret_setflags == -1){

1888

errno = ioctl_errno;

1786

errno = ret_errno;

1889

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1890

1788

errno = old_errno;

1891

return ioctl_errno;

1789

return ret_errno;

1892

1790

}

1893

1791

} else if(debug){

1894

1792

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

1902

1800

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

1903

1801

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

1904

1802

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

1905

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1803

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

1906

1804

.interfaces = NULL, .interfaces_size = 0 };

1907

1805

AvahiSServiceBrowser *sb = NULL;

1908

1806

error_t ret_errno;

1912

1810

int exitcode = EXIT_SUCCESS;

1913

1811

char *interfaces_to_take_down = NULL;

1914

1812

size_t interfaces_to_take_down_size = 0;

1915

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

1916

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

1917

char *tempdir = NULL;

1813

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

1814

bool tempdir_created = false;

1918

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1919

1816

const char *seckey = PATHDIR "/" SECKEY;

1920

1817

const char *pubkey = PATHDIR "/" PUBKEY;

2102

1999

/* Work around Debian bug #633582:

2103

2000

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

2104

2001

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

2110

} else {

2002

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

2111

2004

struct stat st;

2112

2005

2113

2006

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

2153

2046

}

2154

2047

2155

2048

/* Lower privileges */

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2160

}

2049

lower_privileges();

2161

2050

}

2162

2051

}

2163

2052

2189

2078

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

2190

2079

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

2191

2080

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

2194

2085

}

2195

2086

2196

2087

if(not debug){

2274

2165

2275

2166

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

2276

2167

if(mc.interfaces == NULL){

2277

struct dirent **direntries = NULL;

2168

struct dirent **direntries;

2278

2169

/* Look for any good interfaces */

2279

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2280

2171

alphasort);

2286

2177

if(ret_errno != 0){

2287

2178

errno = ret_errno;

2288

2179

perror_plus("argz_add");

2289

free(direntries[i]);

2290

2180

continue;

2291

2181

}

2292

2182

if(debug){

2293

2183

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

2294

2184

direntries[i]->d_name);

2295

2185

}

2296

free(direntries[i]);

2297

2186

}

2298

2187

free(direntries);

2299

2188

} else {

2300

if(ret == 0){

2301

free(direntries);

2302

}

2189

free(direntries);

2303

2190

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

2304

2191

exitcode = EXIT_FAILURE;

2305

2192

goto end;

2328

2215

break;

2329

2216

}

2330

2217

bool interface_was_up = interface_is_up(interface);

2331

errno = bring_up_interface(interface, delay);

2218

ret = bring_up_interface(interface, delay);

2332

2219

if(not interface_was_up){

2333

if(errno != 0){

2220

if(ret != 0){

2221

errno = ret;

2334

2222

perror_plus("Failed to bring up interface");

2335

2223

} else {

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

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;

2340

2229

perror_plus("argz_add");

2341

2230

}

2342

2231

}

2373

2262

goto end;

2374

2263

}

2375

2264

2376

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

2377

tempdir = mkdtemp(run_tempdir);

2378

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

2379

if(debug){

2380

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

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

2265

if(mkdtemp(tempdir) == NULL){

2386

2266

perror_plus("mkdtemp");

2387

2267

goto end;

2388

2268

}

2269

tempdir_created = true;

2389

2270

2390

2271

if(quit_now){

2391

2272

goto end;

2466

2347

sleep((unsigned int)retry_interval);

2467

2348

}

2468

2349

2469

if(not quit_now){

2350

if (not quit_now){

2470

2351

exitcode = EXIT_SUCCESS;

2471

2352

}

2472

2353

2527

2408

if(debug){

2528

2409

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

2529

2410

}

2530

2411

2531

2412

ret = avahi_loop_with_timeout(simple_poll,

2532

2413

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

2533

2414

if(debug){

2569

2450

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

2570

2451

while(mc.current_server != NULL){

2571

2452

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

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

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2580

2453

free(mc.current_server);

2581

2454

mc.current_server = next;

2582

2455

}

2583

2456

}

2584

2457

2585

/* Re-raise privileges */

2458

/* Re-raise priviliges */

2586

2459

{

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2614

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2620

}

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();

2621

2485

}

2622

2486

2623

2487

free(interfaces_to_take_down);

2624

2488

free(interfaces_hooks);

2625

2489

2626

2490

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

2627

if(tempdir != NULL){

2491

if(tempdir_created){

2628

2492

struct dirent **direntries = NULL;

2629

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

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

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

2637

notdotentries, alphasort);

2638

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

2639

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

2640

alphasort);

2641

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

2642

#else /* not __GLIBC__ */

2643

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

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

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

2648

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

2649

if(ret == -1){

2650

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

2651

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

2652

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

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

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

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

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

2664

perror_plus("rmdir");

2665

}

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);

2666

2512

}

2667

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");

2668

2523

}

2669

2524

}

2670

2525