/mandos/trunk : revision 603

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(),

59

getnameinfo() */

58

inet_pton(), connect() */

60

59

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

61

60

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

62

61

*/

74

73

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

75

74

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

76

75

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

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

92

91

argz_delete(), argz_append(),

93

92

argz_stringify(), argz_add(),

94

93

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

97

94

98

95

#ifdef __linux__

99

96

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

183

180

perror(print_text);

184

181

}

185

182

186

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

183

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

187

184

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

188

185

va_list ap;

189

186

va_start (ap, format);

190

187

191

188

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

192

189

program_invocation_short_name));

193

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

190

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

194

191

}

195

192

196

193

/*

198

195

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

199

196

* "buffer_length" is how much is already used.

200

197

*/

201

__attribute__((nonnull, warn_unused_result))

202

198

size_t incbuffer(char **buffer, size_t buffer_length,

203

199

size_t buffer_capacity){

204

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

201

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

202

if(buffer == NULL){

211

203

return 0;

212

204

}

213

*buffer = new_buf;

214

205

buffer_capacity += BUFFER_SIZE;

215

206

}

216

207

return buffer_capacity;

217

208

}

218

209

219

210

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

220

__attribute__((nonnull, warn_unused_result))

221

211

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

222

212

int af, server **current_server){

223

213

int ret;

234

224

perror_plus("strdup");

235

225

return false;

236

226

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

227

/* Special case of first server */

243

228

if(*current_server == NULL){

244

229

new_server->next = new_server;

245

230

new_server->prev = new_server;

246

231

*current_server = new_server;

232

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

247

233

} else {

248

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

249

234

new_server->next = *current_server;

250

235

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

251

236

new_server->prev->next = new_server;

252

237

(*current_server)->prev = new_server;

253

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

254

244

return true;

255

245

}

256

246

257

247

/*

258

248

* Initialize GPGME.

259

249

*/

260

__attribute__((nonnull, warn_unused_result))

261

250

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

262

251

const char *tempdir, mandos_context *mc){

263

252

gpgme_error_t rc;

353

342

* Decrypt OpenPGP data.

354

343

* Returns -1 on error

355

344

*/

356

__attribute__((nonnull, warn_unused_result))

357

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

358

346

size_t crypto_size,

359

347

char **plaintext,

479

467

return plaintext_length;

480

468

}

481

469

482

__attribute__((warn_unused_result))

483

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

484

471

const char *ret = gnutls_strerror(value);

485

472

if(ret == NULL)

486

473

ret = "(unknown)";

488

475

}

489

476

490

477

/* GnuTLS log function callback */

491

__attribute__((nonnull))

492

478

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

493

479

const char* string){

494

480

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

495

481

}

496

482

497

__attribute__((nonnull, warn_unused_result))

498

483

static int init_gnutls_global(const char *pubkeyfilename,

499

484

const char *seckeyfilename,

500

485

mandos_context *mc){

574

559

return -1;

575

560

}

576

561

577

__attribute__((nonnull, warn_unused_result))

578

562

static int init_gnutls_session(gnutls_session_t *session,

579

563

mandos_context *mc){

580

564

int ret;

637

621

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

638

622

639

623

/* Called when a Mandos server is found */

640

__attribute__((nonnull, warn_unused_result))

641

624

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

642

625

AvahiIfIndex if_index,

643

626

int af, mandos_context *mc){

644

627

int ret, tcp_sd = -1;

645

628

ssize_t sret;

646

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

647

633

char *buffer = NULL;

648

634

char *decrypted_buffer = NULL;

649

635

size_t buffer_length = 0;

673

659

return -1;

674

660

}

675

661

676

/* If the interface is specified and we have a list of interfaces */

677

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

678

/* Check if the interface is one of the interfaces we are using */

679

bool match = false;

680

{

681

char *interface = NULL;

682

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

683

interface))){

684

if(if_nametoindex(interface) == (unsigned int)if_index){

685

match = true;

686

break;

687

}

688

}

689

}

690

if(not match){

691

/* This interface does not match any in the list, so we don't

692

connect to the server */

693

if(debug){

694

char interface[IF_NAMESIZE];

695

if(if_indextoname((unsigned int)if_index, interface) == NULL){

696

perror_plus("if_indextoname");

697

} else {

698

fprintf_plus(stderr, "Skipping server on non-used interface"

699

" \"%s\"\n",

700

if_indextoname((unsigned int)if_index,

701

interface));

702

}

703

}

704

return -1;

705

}

706

}

707

708

662

ret = init_gnutls_session(&session, mc);

709

663

if(ret != 0){

710

664

return -1;

730

684

731

685

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

732

686

if(af == AF_INET6){

733

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

734

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

687

to.in6.sin6_family = (sa_family_t)af;

688

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

735

689

} else { /* IPv4 */

736

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

737

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

690

to.in.sin_family = (sa_family_t)af;

691

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

738

692

}

739

693

if(ret < 0 ){

740

694

int e = errno;

749

703

goto mandos_end;

750

704

}

751

705

if(af == AF_INET6){

752

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

753

if(IN6_IS_ADDR_LINKLOCAL

754

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

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

755

710

if(if_index == AVAHI_IF_UNSPEC){

756

711

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

757

712

" incomplete without a network interface\n");

759

714

goto mandos_end;

760

715

}

761

716

/* Set the network interface number as scope */

762

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

717

to.in6.sin6_scope_id = (uint32_t)if_index;

763

718

}

764

719

} else {

765

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

720

to.in.sin_port = htons(port); /* Spurious warnings from

721

-Wconversion and

722

-Wunreachable-code */

766

723

}

767

724

768

725

if(quit_now){

785

742

}

786

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

787

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

788

746

if(af == AF_INET6){

789

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

790

sizeof(struct sockaddr_in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

747

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

748

sizeof(addrstr));

793

749

} else {

794

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

795

sizeof(struct sockaddr_in),

796

addrstr, sizeof(addrstr), NULL, 0,

797

NI_NUMERICHOST);

750

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

751

sizeof(addrstr));

798

752

}

799

if(ret == EAI_SYSTEM){

800

perror_plus("getnameinfo");

801

} else if(ret != 0) {

802

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

803

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

804

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

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

805

759

}

806

760

}

807

761

811

765

}

812

766

813

767

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

768

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

816

769

} else {

817

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

818

sizeof(struct sockaddr_in));

770

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

819

771

}

820

772

if(ret < 0){

821

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

773

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

822

774

int e = errno;

823

775

perror_plus("connect");

824

776

errno = e;

1039

991

return retval;

1040

992

}

1041

993

1042

__attribute__((nonnull))

1043

994

static void resolve_callback(AvahiSServiceResolver *r,

1044

995

AvahiIfIndex interface,

1045

996

AvahiProtocol proto,

1053

1004

AVAHI_GCC_UNUSED AvahiStringList *txt,

1054

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1006

flags,

1056

void *mc){

1007

void* mc){

1057

1008

if(r == NULL){

1058

1009

return;

1059

1010

}

1112

1063

const char *domain,

1113

1064

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1114

1065

flags,

1115

void *mc){

1066

void* mc){

1116

1067

if(b == NULL){

1117

1068

return;

1118

1069

}

1178

1129

errno = old_errno;

1179

1130

}

1180

1131

1181

__attribute__((nonnull, warn_unused_result))

1182

1132

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

1183

1133

int ret;

1184

1134

error_t ret_errno;

1203

1153

return true;

1204

1154

}

1205

1155

1206

__attribute__((nonnull, warn_unused_result))

1207

1156

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

1208

1157

1209

1158

/* Reject the loopback device */

1251

1200

* corresponds to an acceptable network device.

1252

1201

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

1253

1202

*/

1254

__attribute__((nonnull, warn_unused_result))

1255

1203

int good_interface(const struct dirent *if_entry){

1256

1204

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

1257

1205

return 0;

1275

1223

/*

1276

1224

* This function determines if a network interface is up.

1277

1225

*/

1278

__attribute__((nonnull, warn_unused_result))

1279

1226

bool interface_is_up(const char *interface){

1280

1227

struct ifreq ifr;

1281

1228

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

1292

1239

/*

1293

1240

* This function determines if a network interface is running

1294

1241

*/

1295

__attribute__((nonnull, warn_unused_result))

1296

1242

bool interface_is_running(const char *interface){

1297

1243

struct ifreq ifr;

1298

1244

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

1306

1252

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

1307

1253

}

1308

1254

1309

__attribute__((nonnull, pure, warn_unused_result))

1310

1255

int notdotentries(const struct dirent *direntry){

1311

1256

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

1312

1257

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

1319

1264

}

1320

1265

1321

1266

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

1322

__attribute__((nonnull, warn_unused_result))

1323

1267

int runnable_hook(const struct dirent *direntry){

1324

1268

int ret;

1325

1269

size_t sret;

1380

1324

return 1;

1381

1325

}

1382

1326

1383

__attribute__((nonnull, warn_unused_result))

1384

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

1328

mandos_context *mc){

1386

1329

int ret;

1390

1333

1391

1334

while(true){

1392

1335

if(mc->current_server == NULL){

1393

if(debug){

1336

if (debug){

1394

1337

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

1395

1338

" No timeout!\n");

1396

1339

}

1397

1340

ret = avahi_simple_poll_iterate(s, -1);

1398

1341

} else {

1399

if(debug){

1342

if (debug){

1400

1343

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

1401

1344

" it, or wait\n");

1402

1345

}

1419

1362

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

1420

1363

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

1421

1364

1422

if(debug){

1365

if (debug){

1423

1366

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

1424

1367

block_time);

1425

1368

}

1447

1390

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

1448

1391

}

1449

1392

if(ret != 0){

1450

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

1393

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

1451

1394

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

1452

1395

}

1453

1396

}

1455

1398

}

1456

1399

1457

1400

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

1458

__attribute__((warn_unused_result))

1459

1401

error_t raise_privileges(void){

1460

1402

error_t old_errno = errno;

1461

1403

error_t ret_errno = 0;

1468

1410

}

1469

1411

1470

1412

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

1471

__attribute__((warn_unused_result))

1472

1413

error_t raise_privileges_permanently(void){

1473

1414

error_t old_errno = errno;

1474

1415

error_t ret_errno = raise_privileges();

1485

1426

}

1486

1427

1487

1428

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

1488

__attribute__((warn_unused_result))

1489

1429

error_t lower_privileges(void){

1490

1430

error_t old_errno = errno;

1491

1431

error_t ret_errno = 0;

1498

1438

}

1499

1439

1500

1440

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

1441

error_t lower_privileges_permanently(void){

1503

1442

error_t old_errno = errno;

1504

1443

error_t ret_errno = 0;

1510

1449

return ret_errno;

1511

1450

}

1512

1451

1513

__attribute__((nonnull))

1514

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

1452

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

1515

1453

const float delay){

1516

1454

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1517

1457

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

1518

1458

alphasort);

1519

1459

if(numhooks == -1){

1526

1466

perror_plus("scandir");

1527

1467

}

1528

1468

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

1469

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

1532

1470

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

1533

1471

direntry = direntries[i];

1545

1483

if(hook_pid == 0){

1546

1484

/* Child */

1547

1485

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1486

raise_privileges_permanently();

1552

1487

/* Set group */

1553

1488

errno = 0;

1554

1489

ret = setgid(0);

1555

1490

if(ret == -1){

1556

1491

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

1492

}

1559

1493

/* Reset supplementary groups */

1560

1494

errno = 0;

1561

1495

ret = setgroups(0, NULL);

1562

1496

if(ret == -1){

1563

1497

perror_plus("setgroups");

1564

_exit(EX_NOPERM);

1565

}

1566

ret = dup2(devnull, STDIN_FILENO);

1567

if(ret == -1){

1568

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

1569

_exit(EX_OSERR);

1570

}

1571

ret = close(devnull);

1572

if(ret == -1){

1573

perror_plus("close");

1574

_exit(EX_OSERR);

1575

}

1576

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1577

if(ret == -1){

1578

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

1579

_exit(EX_OSERR);

1580

}

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1581

1502

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

1582

1503

if(ret == -1){

1583

1504

perror_plus("setenv");

1599

1520

_exit(EX_OSERR);

1600

1521

}

1601

1522

char *delaystring;

1602

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

1523

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

1603

1524

if(ret == -1){

1604

1525

perror_plus("asprintf");

1605

1526

_exit(EX_OSERR);

1658

1579

}

1659

1580

close(devnull);

1660

1581

}

1582

return true;

1661

1583

}

1662

1584

1663

__attribute__((nonnull, warn_unused_result))

1664

1585

error_t bring_up_interface(const char *const interface,

1665

1586

const float delay){

1587

int sd = -1;

1666

1588

error_t old_errno = errno;

1667

int ret;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1668

1591

struct ifreq network;

1669

1592

unsigned int if_index = if_nametoindex(interface);

1670

1593

if(if_index == 0){

1679

1602

}

1680

1603

1681

1604

if(not interface_is_up(interface)){

1682

error_t ret_errno = 0, ioctl_errno = 0;

1683

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

1605

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

1684

1606

ret_errno = errno;

1685

1607

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

1686

1608

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

1687

errno = old_errno;

1688

1609

return ret_errno;

1689

1610

}

1690

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

1611

network.ifr_flags |= IFF_UP;

1691

1612

1692

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

1693

if(sd == -1){

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1694

1615

ret_errno = errno;

1695

1616

perror_plus("socket");

1696

1617

errno = old_errno;

1697

1618

return ret_errno;

1698

1619

}

1699

1620

1700

1621

if(quit_now){

1701

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

1702

if(ret == -1){

1703

perror_plus("close");

1704

}

1622

close(sd);

1705

1623

errno = old_errno;

1706

1624

return EINTR;

1707

1625

}

1711

1629

interface);

1712

1630

}

1713

1631

1714

/* Raise privileges */

1715

ret_errno = raise_privileges();

1716

bool restore_loglevel = false;

1717

if(ret_errno != 0){

1718

perror_plus("Failed to raise privileges");

1719

}

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1720

1635

#ifdef __linux__

1721

int ret_linux;

1722

if(ret_errno == 0){

1723

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1724

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

1725

ret_linux = klogctl(8, NULL, 5);

1726

if(ret_linux == -1){

1727

perror_plus("klogctl");

1728

} else {

1729

restore_loglevel = true;

1730

}

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1731

1643

}

1732

1644

#endif /* __linux__ */

1733

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

1734

ioctl_errno = errno;

1645

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

1646

ret_errno = errno;

1735

1647

#ifdef __linux__

1736

1648

if(restore_loglevel){

1737

1649

ret_linux = klogctl(7, NULL, 0);

1741

1653

}

1742

1654

#endif /* __linux__ */

1743

1655

1744

/* If raise_privileges() succeeded above */

1745

if(ret_errno == 0){

1746

/* Lower privileges */

1747

ret_errno = lower_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to lower privileges");

1751

}

1752

}

1656

/* Lower privileges */

1657

lower_privileges();

1753

1658

1754

1659

/* Close the socket */

1755

1660

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

1758

1663

}

1759

1664

1760

1665

if(ret_setflags == -1){

1761

errno = ioctl_errno;

1666

errno = ret_errno;

1762

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1763

1668

errno = old_errno;

1764

return ioctl_errno;

1669

return ret_errno;

1765

1670

}

1766

1671

} else if(debug){

1767

1672

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

1785

1690

return 0;

1786

1691

}

1787

1692

1788

__attribute__((nonnull, warn_unused_result))

1789

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1790

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1791

1698

struct ifreq network;

1792

1699

unsigned int if_index = if_nametoindex(interface);

1793

1700

if(if_index == 0){

1796

1703

return ENXIO;

1797

1704

}

1798

1705

if(interface_is_up(interface)){

1799

error_t ret_errno = 0, ioctl_errno = 0;

1800

1706

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

1801

1707

ret_errno = errno;

1802

1708

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

1803

1709

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

1804

errno = old_errno;

1805

1710

return ret_errno;

1806

1711

}

1807

1712

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

1808

1713

1809

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

1810

if(sd == -1){

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1811

1716

ret_errno = errno;

1812

1717

perror_plus("socket");

1813

1718

errno = old_errno;

1819

1724

interface);

1820

1725

}

1821

1726

1822

/* Raise privileges */

1823

ret_errno = raise_privileges();

1824

if(ret_errno != 0){

1825

perror_plus("Failed to raise privileges");

1826

}

1827

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

1828

ioctl_errno = errno;

1829

1830

/* If raise_privileges() succeeded above */

1831

if(ret_errno == 0){

1832

/* Lower privileges */

1833

ret_errno = lower_privileges();

1834

if(ret_errno != 0){

1835

errno = ret_errno;

1836

perror_plus("Failed to lower privileges");

1837

}

1838

}

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1839

1735

1840

1736

/* Close the socket */

1841

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

1737

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

1842

1738

if(ret == -1){

1843

1739

perror_plus("close");

1844

1740

}

1845

1741

1846

1742

if(ret_setflags == -1){

1847

errno = ioctl_errno;

1743

errno = ret_errno;

1848

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1849

1745

errno = old_errno;

1850

return ioctl_errno;

1746

return ret_errno;

1851

1747

}

1852

1748

} else if(debug){

1853

1749

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

1861

1757

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

1862

1758

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

1863

1759

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

1864

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

1760

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

1865

1761

.interfaces = NULL, .interfaces_size = 0 };

1866

1762

AvahiSServiceBrowser *sb = NULL;

1867

1763

error_t ret_errno;

1877

1773

const char *seckey = PATHDIR "/" SECKEY;

1878

1774

const char *pubkey = PATHDIR "/" PUBKEY;

1879

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1880

1777

1881

1778

bool gnutls_initialized = false;

1882

1779

bool gpgme_initialized = false;

2060

1957

/* Work around Debian bug #633582:

2061

1958

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

2062

1959

2063

/* Re-raise privileges */

2064

ret_errno = raise_privileges();

2065

if(ret_errno != 0){

2066

errno = ret_errno;

2067

perror_plus("Failed to raise privileges");

2068

} else {

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2069

1962

struct stat st;

2070

1963

2071

1964

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

2111

2004

}

2112

2005

2113

2006

/* Lower privileges */

2114

ret_errno = lower_privileges();

2115

if(ret_errno != 0){

2116

errno = ret_errno;

2117

perror_plus("Failed to lower privileges");

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2118

2011

}

2119

2012

}

2120

2013

}

2121

2014

2122

/* Remove invalid interface names (except "none") */

2015

/* Remove empty interface names */

2123

2016

{

2124

2017

char *interface = NULL;

2125

2018

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2126

2019

interface))){

2127

if(strcmp(interface, "none") != 0

2128

and if_nametoindex(interface) == 0){

2129

if(interface[0] != '\0'){

2020

if(if_nametoindex(interface) == 0){

2021

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2130

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2131

2023

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

2132

2024

}

2138

2030

2139

2031

/* Run network hooks */

2140

2032

{

2033

2141

2034

if(mc.interfaces != NULL){

2142

2035

interfaces_hooks = malloc(mc.interfaces_size);

2143

2036

if(interfaces_hooks == NULL){

2145

2038

goto end;

2146

2039

}

2147

2040

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

2148

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

2149

}

2150

run_network_hooks("start", interfaces_hooks != NULL ?

2151

interfaces_hooks : "", delay);

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

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

2046

interfaces_hooks : "", delay)){

2047

goto end;

2048

}

2152

2049

}

2153

2050

2154

2051

if(not debug){

2242

2139

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

2243

2140

direntries[i]->d_name);

2244

2141

if(ret_errno != 0){

2245

errno = ret_errno;

2246

2142

perror_plus("argz_add");

2247

2143

continue;

2248

2144

}

2260

2156

}

2261

2157

}

2262

2158

2263

/* Bring up interfaces which are down, and remove any "none"s */

2264

{

2159

/* If we only got one interface, explicitly use only that one */

2160

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2161

if(debug){

2162

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2163

mc.interfaces);

2164

}

2165

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2166

}

2167

2168

/* Bring up interfaces which are down */

2169

if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1

2170

and strcmp(mc.interfaces, "none") == 0)){

2265

2171

char *interface = NULL;

2266

2172

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2267

2173

interface))){

2268

/* If interface name is "none", stop bringing up interfaces.

2269

Also remove all instances of "none" from the list */

2270

if(strcmp(interface, "none") == 0){

2271

argz_delete(&mc.interfaces, &mc.interfaces_size,

2272

interface);

2273

interface = NULL;

2274

while((interface = argz_next(mc.interfaces,

2275

mc.interfaces_size, interface))){

2276

if(strcmp(interface, "none") == 0){

2277

argz_delete(&mc.interfaces, &mc.interfaces_size,

2278

interface);

2279

interface = NULL;

2280

}

2281

}

2282

break;

2283

}

2284

2174

bool interface_was_up = interface_is_up(interface);

2285

errno = bring_up_interface(interface, delay);

2175

ret = bring_up_interface(interface, delay);

2286

2176

if(not interface_was_up){

2287

if(errno != 0){

2177

if(ret != 0){

2178

errno = ret;

2288

2179

perror_plus("Failed to bring up interface");

2289

2180

} else {

2290

errno = argz_add(&interfaces_to_take_down,

2291

&interfaces_to_take_down_size,

2292

interface);

2293

if(errno != 0){

2294

perror_plus("argz_add");

2295

}

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2296

2184

}

2297

2185

}

2298

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2299

2190

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

2300

2191

fprintf_plus(stderr, "No interfaces were brought up\n");

2301

2192

}

2302

2193

}

2303

2194

2304

/* If we only got one interface, explicitly use only that one */

2305

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2306

if(debug){

2307

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2308

mc.interfaces);

2309

}

2310

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2311

}

2312

2313

2195

if(quit_now){

2314

2196

goto end;

2315

2197

}

2373

2255

exitcode = EX_USAGE;

2374

2256

goto end;

2375

2257

}

2376

2258

2377

2259

if(quit_now){

2378

2260

goto end;

2379

2261

}

2409

2291

fprintf_plus(stderr, "Retrying in %d seconds\n",

2410

2292

(int)retry_interval);

2411

2293

}

2412

sleep((unsigned int)retry_interval);

2294

sleep((int)retry_interval);

2413

2295

}

2414

2296

2415

if(not quit_now){

2297

if (not quit_now){

2416

2298

exitcode = EXIT_SUCCESS;

2417

2299

}

2418

2300

2488

2370

}

2489

2371

2490

2372

/* Cleanup things */

2491

free(mc.interfaces);

2492

2493

2373

if(sb != NULL)

2494

2374

avahi_s_service_browser_free(sb);

2495

2375

2520

2400

}

2521

2401

}

2522

2402

2523

/* Re-raise privileges */

2403

/* Re-raise priviliges */

2524

2404

{

2525

ret_errno = raise_privileges();

2526

if(ret_errno != 0){

2527

perror_plus("Failed to raise privileges");

2528

} else {

2529

2530

/* Run network hooks */

2531

run_network_hooks("stop", interfaces_hooks != NULL ?

2532

interfaces_hooks : "", delay);

2533

2534

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

2535

{

2536

char *interface = NULL;

2537

while((interface=argz_next(interfaces_to_take_down,

2538

interfaces_to_take_down_size,

2539

interface))){

2540

ret_errno = take_down_interface(interface);

2541

if(ret_errno != 0){

2542

errno = ret_errno;

2543

perror_plus("Failed to take down interface");

2544

}

2545

}

2546

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

2547

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

2548

" down\n");

2549

}

2550

}

2551

}

2552

ret_errno = lower_privileges_permanently();

2553

if(ret_errno != 0){

2554

perror_plus("Failed to lower privileges permanently");

2555

}

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

2421

}

2422

}

2423

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

2424

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

2425

" down\n");

2426

}

2427

}

2428

2429

lower_privileges_permanently();

2556

2430

}

2557

2431

2558

2432

free(interfaces_to_take_down);

2564

2438

struct dirent *direntry = NULL;

2565

2439

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

2566

2440

alphasort);

2567

if(numentries > 0){

2441

if (numentries > 0){

2568

2442

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

2569

2443

direntry = direntries[i];

2570

2444

char *fullname = NULL;

2585

2459

2586

2460

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

2587

2461

free(direntries);

2588

if(numentries == -1){

2462

if (numentries == -1){

2589

2463

perror_plus("scandir");

2590

2464

}

2591

2465

ret = rmdir(tempdir);