/mandos/release : revision 237.7.237

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

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

#include <fcntl.h> /* open() */

60

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

62

*/

73

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

75

getuid(), getgid(), seteuid(),

75

76

setgid(), pause(), _exit() */

76

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

77

#include <arpa/inet.h> /* inet_pton(), htons() */

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

91

92

argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

94

argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

96

EAI_SYSTEM, gai_strerror() */

94

97

95

98

#ifdef __linux__

96

99

#include <sys/klog.h> /* klogctl() */

180

183

perror(print_text);

181

184

}

182

185

183

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

186

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

184

187

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

185

188

va_list ap;

186

189

va_start (ap, format);

195

198

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

196

199

* "buffer_length" is how much is already used.

197

200

*/

201

__attribute__((nonnull, warn_unused_result))

198

202

size_t incbuffer(char **buffer, size_t buffer_length,

199

203

size_t buffer_capacity){

200

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

205

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

203

211

return 0;

204

212

}

213

*buffer = new_buf;

205

214

buffer_capacity += BUFFER_SIZE;

206

215

}

207

216

return buffer_capacity;

208

217

}

209

218

210

219

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

220

__attribute__((nonnull, warn_unused_result))

211

221

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

212

222

int af, server **current_server){

213

223

int ret;

224

234

perror_plus("strdup");

225

235

return false;

226

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

227

242

/* Special case of first server */

228

243

if(*current_server == NULL){

229

244

new_server->next = new_server;

230

245

new_server->prev = new_server;

231

246

*current_server = new_server;

232

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

233

247

} else {

248

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

234

249

new_server->next = *current_server;

235

250

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

236

251

new_server->prev->next = new_server;

237

252

(*current_server)->prev = new_server;

238

253

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

254

return true;

245

255

}

246

256

247

257

/*

248

258

* Initialize GPGME.

249

259

*/

250

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

251

const char *tempdir, mandos_context *mc){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

252

265

gpgme_error_t rc;

253

266

gpgme_engine_info_t engine_info;

254

267

255

268

/*

256

269

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

257

270

*/

258

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

259

272

int ret;

260

273

int fd;

261

274

gpgme_data_t pgp_data;

342

355

* Decrypt OpenPGP data.

343

356

* Returns -1 on error

344

357

*/

358

__attribute__((nonnull, warn_unused_result))

345

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

360

size_t crypto_size,

347

361

char **plaintext,

467

481

return plaintext_length;

468

482

}

469

483

470

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

471

486

const char *ret = gnutls_strerror(value);

472

487

if(ret == NULL)

473

488

ret = "(unknown)";

475

490

}

476

491

477

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

478

494

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

479

495

const char* string){

480

496

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

481

497

}

482

498

499

__attribute__((nonnull, warn_unused_result))

483

500

static int init_gnutls_global(const char *pubkeyfilename,

484

501

const char *seckeyfilename,

485

502

mandos_context *mc){

559

576

return -1;

560

577

}

561

578

579

__attribute__((nonnull, warn_unused_result))

562

580

static int init_gnutls_session(gnutls_session_t *session,

563

581

mandos_context *mc){

564

582

int ret;

621

639

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

622

640

623

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

624

643

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

625

644

AvahiIfIndex if_index,

626

645

int af, mandos_context *mc){

627

646

int ret, tcp_sd = -1;

628

647

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

648

struct sockaddr_storage to;

633

649

char *buffer = NULL;

634

650

char *decrypted_buffer = NULL;

635

651

size_t buffer_length = 0;

716

732

717

733

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

718

734

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

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

735

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

736

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

721

737

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

738

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

739

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

724

740

}

725

741

if(ret < 0 ){

726

742

int e = errno;

735

751

goto mandos_end;

736

752

}

737

753

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

748

757

if(if_index == AVAHI_IF_UNSPEC){

749

758

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

750

759

" incomplete without a network interface\n");

752

761

goto mandos_end;

753

762

}

754

763

/* Set the network interface number as scope */

755

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

756

765

}

757

766

} else {

758

to.in.sin_port = htons(port);

767

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

759

768

}

760

769

761

770

if(quit_now){

778

787

}

779

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

781

const char *pcret;

782

790

if(af == AF_INET6){

783

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

784

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

785

795

} else {

786

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

787

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

788

800

}

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

if(strcmp(addrstr, ip) != 0){

793

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

794

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

805

} else if(strcmp(addrstr, ip) != 0){

806

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

795

807

}

796

808

}

797

809

801

813

}

802

814

803

815

if(af == AF_INET6){

804

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

816

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

817

sizeof(struct sockaddr_in6));

805

818

} else {

806

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

819

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

820

sizeof(struct sockaddr_in));

807

821

}

808

822

if(ret < 0){

809

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

823

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

810

824

int e = errno;

811

825

perror_plus("connect");

812

826

errno = e;

1027

1041

return retval;

1028

1042

}

1029

1043

1044

__attribute__((nonnull))

1030

1045

static void resolve_callback(AvahiSServiceResolver *r,

1031

1046

AvahiIfIndex interface,

1032

1047

AvahiProtocol proto,

1040

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

1057

flags,

1043

void* mc){

1058

void *mc){

1044

1059

if(r == NULL){

1045

1060

return;

1046

1061

}

1099

1114

const char *domain,

1100

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1116

flags,

1102

void* mc){

1117

void *mc){

1103

1118

if(b == NULL){

1104

1119

return;

1105

1120

}

1165

1180

errno = old_errno;

1166

1181

}

1167

1182

1183

__attribute__((nonnull, warn_unused_result))

1168

1184

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

1169

1185

int ret;

1170

1186

error_t ret_errno;

1189

1205

return true;

1190

1206

}

1191

1207

1208

__attribute__((nonnull, warn_unused_result))

1192

1209

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

1193

1210

1194

1211

/* Reject the loopback device */

1236

1253

* corresponds to an acceptable network device.

1237

1254

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

1238

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1239

1257

int good_interface(const struct dirent *if_entry){

1240

1258

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

1241

1259

return 0;

1259

1277

/*

1260

1278

* This function determines if a network interface is up.

1261

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1262

1281

bool interface_is_up(const char *interface){

1263

1282

struct ifreq ifr;

1264

1283

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

1275

1294

/*

1276

1295

* This function determines if a network interface is running

1277

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1278

1298

bool interface_is_running(const char *interface){

1279

1299

struct ifreq ifr;

1280

1300

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

1288

1308

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

1289

1309

}

1290

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1291

1312

int notdotentries(const struct dirent *direntry){

1292

1313

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

1293

1314

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

1300

1321

}

1301

1322

1302

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1303

1325

int runnable_hook(const struct dirent *direntry){

1304

1326

int ret;

1305

1327

size_t sret;

1313

1335

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

1314

1336

"abcdefghijklmnopqrstuvwxyz"

1315

1337

"0123456789"

1316

"_-");

1338

"_.-");

1317

1339

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

1318

1340

/* Contains non-allowed characters */

1319

1341

if(debug){

1337

1359

}

1338

1360

return 0;

1339

1361

}

1362

free(fullname);

1340

1363

if(not (S_ISREG(st.st_mode))){

1341

1364

/* Not a regular file */

1342

1365

if(debug){

1360

1383

return 1;

1361

1384

}

1362

1385

1386

__attribute__((nonnull, warn_unused_result))

1363

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

1388

mandos_context *mc){

1365

1389

int ret;

1369

1393

1370

1394

while(true){

1371

1395

if(mc->current_server == NULL){

1372

if (debug){

1396

if(debug){

1373

1397

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

1374

1398

" No timeout!\n");

1375

1399

}

1376

1400

ret = avahi_simple_poll_iterate(s, -1);

1377

1401

} else {

1378

if (debug){

1402

if(debug){

1379

1403

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

1380

1404

" it, or wait\n");

1381

1405

}

1398

1422

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

1399

1423

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

1400

1424

1401

if (debug){

1425

if(debug){

1402

1426

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

1403

1427

block_time);

1404

1428

}

1426

1450

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

1427

1451

}

1428

1452

if(ret != 0){

1429

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

1453

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

1430

1454

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

1431

1455

}

1432

1456

}

1434

1458

}

1435

1459

1436

1460

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

1461

__attribute__((warn_unused_result))

1437

1462

error_t raise_privileges(void){

1438

1463

error_t old_errno = errno;

1439

1464

error_t ret_errno = 0;

1446

1471

}

1447

1472

1448

1473

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

1474

__attribute__((warn_unused_result))

1449

1475

error_t raise_privileges_permanently(void){

1450

1476

error_t old_errno = errno;

1451

1477

error_t ret_errno = raise_privileges();

1462

1488

}

1463

1489

1464

1490

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

1491

__attribute__((warn_unused_result))

1465

1492

error_t lower_privileges(void){

1466

1493

error_t old_errno = errno;

1467

1494

error_t ret_errno = 0;

1474

1501

}

1475

1502

1476

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1477

1505

error_t lower_privileges_permanently(void){

1478

1506

error_t old_errno = errno;

1479

1507

error_t ret_errno = 0;

1485

1513

return ret_errno;

1486

1514

}

1487

1515

1488

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

1516

__attribute__((nonnull))

1517

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

1489

1518

const float delay){

1490

1519

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

1520

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

1494

1521

alphasort);

1495

1522

if(numhooks == -1){

1502

1529

perror_plus("scandir");

1503

1530

}

1504

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1505

1534

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

1506

1535

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

1507

1536

direntry = direntries[i];

1519

1548

if(hook_pid == 0){

1520

1549

/* Child */

1521

1550

/* Raise privileges */

1522

raise_privileges_permanently();

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1523

1555

/* Set group */

1524

1556

errno = 0;

1525

1557

ret = setgid(0);

1526

1558

if(ret == -1){

1527

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1528

1561

}

1529

1562

/* Reset supplementary groups */

1530

1563

errno = 0;

1531

1564

ret = setgroups(0, NULL);

1532

1565

if(ret == -1){

1533

1566

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1538

1584

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

1539

1585

if(ret == -1){

1540

1586

perror_plus("setenv");

1556

1602

_exit(EX_OSERR);

1557

1603

}

1558

1604

char *delaystring;

1559

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

1605

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

1560

1606

if(ret == -1){

1561

1607

perror_plus("asprintf");

1562

1608

_exit(EX_OSERR);

1615

1661

}

1616

1662

close(devnull);

1617

1663

}

1618

return true;

1619

1664

}

1620

1665

1666

__attribute__((nonnull, warn_unused_result))

1621

1667

error_t bring_up_interface(const char *const interface,

1622

1668

const float delay){

1623

int sd = -1;

1624

1669

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1670

int ret;

1627

1671

struct ifreq network;

1628

1672

unsigned int if_index = if_nametoindex(interface);

1629

1673

if(if_index == 0){

1638

1682

}

1639

1683

1640

1684

if(not interface_is_up(interface)){

1641

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

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1642

1687

ret_errno = errno;

1643

1688

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

1644

1689

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

1690

errno = old_errno;

1645

1691

return ret_errno;

1646

1692

}

1647

network.ifr_flags |= IFF_UP;

1693

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

1648

1694

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1695

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

1696

if(sd == -1){

1651

1697

ret_errno = errno;

1652

1698

perror_plus("socket");

1653

1699

errno = old_errno;

1654

1700

return ret_errno;

1655

1701

}

1656

1702

1657

1703

if(quit_now){

1658

close(sd);

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1659

1708

errno = old_errno;

1660

1709

return EINTR;

1661

1710

}

1665

1714

interface);

1666

1715

}

1667

1716

1668

/* Raise priviliges */

1669

raise_privileges();

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1670

1722

1671

1723

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1679

1735

}

1680

1736

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1737

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

1738

ioctl_errno = errno;

1683

1739

#ifdef __linux__

1684

1740

if(restore_loglevel){

1685

1741

ret_linux = klogctl(7, NULL, 0);

1689

1745

}

1690

1746

#endif /* __linux__ */

1691

1747

1692

/* Lower privileges */

1693

lower_privileges();

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1694

1757

1695

1758

/* Close the socket */

1696

1759

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

1699

1762

}

1700

1763

1701

1764

if(ret_setflags == -1){

1702

errno = ret_errno;

1765

errno = ioctl_errno;

1703

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

1767

errno = old_errno;

1705

return ret_errno;

1768

return ioctl_errno;

1706

1769

}

1707

1770

} else if(debug){

1708

1771

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

1726

1789

return 0;

1727

1790

}

1728

1791

1792

__attribute__((nonnull, warn_unused_result))

1729

1793

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

1794

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

1795

struct ifreq network;

1735

1796

unsigned int if_index = if_nametoindex(interface);

1736

1797

if(if_index == 0){

1739

1800

return ENXIO;

1740

1801

}

1741

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1742

1804

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

1743

1805

ret_errno = errno;

1744

1806

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

1745

1807

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

1808

errno = old_errno;

1746

1809

return ret_errno;

1747

1810

}

1748

1811

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

1749

1812

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1813

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

1814

if(sd == -1){

1752

1815

ret_errno = errno;

1753

1816

perror_plus("socket");

1754

1817

errno = old_errno;

1760

1823

interface);

1761

1824

}

1762

1825

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1771

1844

1772

1845

/* Close the socket */

1773

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

1846

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

1774

1847

if(ret == -1){

1775

1848

perror_plus("close");

1776

1849

}

1777

1850

1778

1851

if(ret_setflags == -1){

1779

errno = ret_errno;

1852

errno = ioctl_errno;

1780

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

1854

errno = old_errno;

1782

return ret_errno;

1855

return ioctl_errno;

1783

1856

}

1784

1857

} else if(debug){

1785

1858

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

1793

1866

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

1794

1867

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

1795

1868

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

1796

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

1869

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

1797

1870

.interfaces = NULL, .interfaces_size = 0 };

1798

1871

AvahiSServiceBrowser *sb = NULL;

1799

1872

error_t ret_errno;

1803

1876

int exitcode = EXIT_SUCCESS;

1804

1877

char *interfaces_to_take_down = NULL;

1805

1878

size_t interfaces_to_take_down_size = 0;

1806

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

1807

bool tempdir_created = false;

1879

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

1880

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

1881

char *tempdir = NULL;

1808

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

1883

const char *seckey = PATHDIR "/" SECKEY;

1810

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1811

1885

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

1886

1814

1887

bool gnutls_initialized = false;

1815

1888

bool gpgme_initialized = false;

1993

2066

/* Work around Debian bug #633582:

1994

2067

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

1995

2068

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1998

2075

struct stat st;

1999

2076

2000

2077

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

2040

2117

}

2041

2118

2042

2119

/* Lower privileges */

2043

lower_privileges();

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2044

2125

}

2045

2126

}

2046

2127

2070

2151

goto end;

2071

2152

}

2072

2153

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2081

2158

}

2082

2159

2083

2160

if(not debug){

2171

2248

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2172

2249

direntries[i]->d_name);

2173

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2174

2252

perror_plus("argz_add");

2175

2253

continue;

2176

2254

}

2210

2288

break;

2211

2289

}

2212

2290

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2291

errno = bring_up_interface(interface, delay);

2214

2292

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2293

if(errno != 0){

2217

2294

perror_plus("Failed to bring up interface");

2218

2295

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2222

2302

}

2223

2303

}

2224

2304

}

2253

2333

goto end;

2254

2334

}

2255

2335

2256

if(mkdtemp(tempdir) == NULL){

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2257

2346

perror_plus("mkdtemp");

2258

2347

goto end;

2259

2348

}

2260

tempdir_created = true;

2261

2349

2262

2350

if(quit_now){

2263

2351

goto end;

2338

2426

sleep((unsigned int)retry_interval);

2339

2427

}

2340

2428

2341

if (not quit_now){

2429

if(not quit_now){

2342

2430

exitcode = EXIT_SUCCESS;

2343

2431

}

2344

2432

2399

2487

if(debug){

2400

2488

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

2401

2489

}

2402

2490

2403

2491

ret = avahi_loop_with_timeout(simple_poll,

2404

2492

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

2405

2493

if(debug){

2446

2534

}

2447

2535

}

2448

2536

2449

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2450

2538

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

2476

2571

}

2477

2572

2478

2573

free(interfaces_to_take_down);

2479

2574

free(interfaces_hooks);

2480

2575

2481

2576

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

2482

if(tempdir_created){

2577

if(tempdir != NULL){

2483

2578

struct dirent **direntries = NULL;

2484

2579

struct dirent *direntry = NULL;

2485

2580

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

2486

2581

alphasort);

2487

if (numentries > 0){

2582

if(numentries > 0){

2488

2583

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

2489

2584

direntry = direntries[i];

2490

2585

char *fullname = NULL;

2502

2597

free(fullname);

2503

2598

}

2504

2599

}

2505

2600

2506

2601

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

2507

2602

free(direntries);

2508

if (numentries == -1){

2603

if(numentries == -1){

2509

2604

perror_plus("scandir");

2510

2605

}

2511

2606

ret = rmdir(tempdir);