/mandos/trunk : revision 237.4.37

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);

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

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

250

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

251

const char *tempdir, mandos_context *mc){

265

252

gpgme_error_t rc;

266

253

gpgme_engine_info_t engine_info;

267

254

268

255

/*

269

256

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

270

257

*/

271

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

272

259

int ret;

273

260

int fd;

274

261

gpgme_data_t pgp_data;

355

342

* Decrypt OpenPGP data.

356

343

* Returns -1 on error

357

344

*/

358

__attribute__((nonnull, warn_unused_result))

359

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

346

size_t crypto_size,

361

347

char **plaintext,

481

467

return plaintext_length;

482

468

}

483

469

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

486

471

const char *ret = gnutls_strerror(value);

487

472

if(ret == NULL)

488

473

ret = "(unknown)";

490

475

}

491

476

492

477

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

478

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

495

479

const char* string){

496

480

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

497

481

}

498

482

499

__attribute__((nonnull, warn_unused_result))

500

483

static int init_gnutls_global(const char *pubkeyfilename,

501

484

const char *seckeyfilename,

502

485

mandos_context *mc){

576

559

return -1;

577

560

}

578

561

579

__attribute__((nonnull, warn_unused_result))

580

562

static int init_gnutls_session(gnutls_session_t *session,

581

563

mandos_context *mc){

582

564

int ret;

639

621

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

640

622

641

623

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

624

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

644

625

AvahiIfIndex if_index,

645

626

int af, mandos_context *mc){

646

627

int ret, tcp_sd = -1;

647

628

ssize_t sret;

648

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

649

633

char *buffer = NULL;

650

634

char *decrypted_buffer = NULL;

651

635

size_t buffer_length = 0;

732

716

733

717

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

734

718

if(af == AF_INET6){

735

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

736

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

737

721

} else { /* IPv4 */

738

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

739

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

722

to.in.sin_family = (sa_family_t)af;

723

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

740

724

}

741

725

if(ret < 0 ){

742

726

int e = errno;

751

735

goto mandos_end;

752

736

}

753

737

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

757

742

if(if_index == AVAHI_IF_UNSPEC){

758

743

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

759

744

" incomplete without a network interface\n");

761

746

goto mandos_end;

762

747

}

763

748

/* Set the network interface number as scope */

764

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

765

750

}

766

751

} else {

767

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

752

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

753

-Wconversion and

754

-Wunreachable-code */

768

755

}

769

756

770

757

if(quit_now){

787

774

}

788

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

790

778

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

779

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

780

sizeof(addrstr));

795

781

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

782

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

783

sizeof(addrstr));

800

784

}

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);

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

807

791

}

808

792

}

809

793

813

797

}

814

798

815

799

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

800

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

818

801

} else {

819

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

820

sizeof(struct sockaddr_in));

802

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

821

803

}

822

804

if(ret < 0){

823

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

805

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

824

806

int e = errno;

825

807

perror_plus("connect");

826

808

errno = e;

1041

1023

return retval;

1042

1024

}

1043

1025

1044

__attribute__((nonnull))

1045

1026

static void resolve_callback(AvahiSServiceResolver *r,

1046

1027

AvahiIfIndex interface,

1047

1028

AvahiProtocol proto,

1055

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1038

flags,

1058

void *mc){

1039

void* mc){

1059

1040

if(r == NULL){

1060

1041

return;

1061

1042

}

1114

1095

const char *domain,

1115

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1097

flags,

1117

void *mc){

1098

void* mc){

1118

1099

if(b == NULL){

1119

1100

return;

1120

1101

}

1180

1161

errno = old_errno;

1181

1162

}

1182

1163

1183

__attribute__((nonnull, warn_unused_result))

1184

1164

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

1185

1165

int ret;

1186

1166

error_t ret_errno;

1205

1185

return true;

1206

1186

}

1207

1187

1208

__attribute__((nonnull, warn_unused_result))

1209

1188

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

1210

1189

1211

1190

/* Reject the loopback device */

1253

1232

* corresponds to an acceptable network device.

1254

1233

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

1255

1234

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1235

int good_interface(const struct dirent *if_entry){

1258

1236

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

1259

1237

return 0;

1277

1255

/*

1278

1256

* This function determines if a network interface is up.

1279

1257

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1258

bool interface_is_up(const char *interface){

1282

1259

struct ifreq ifr;

1283

1260

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

1294

1271

/*

1295

1272

* This function determines if a network interface is running

1296

1273

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1274

bool interface_is_running(const char *interface){

1299

1275

struct ifreq ifr;

1300

1276

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

1308

1284

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

1309

1285

}

1310

1286

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1287

int notdotentries(const struct dirent *direntry){

1313

1288

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

1314

1289

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

1321

1296

}

1322

1297

1323

1298

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1299

int runnable_hook(const struct dirent *direntry){

1326

1300

int ret;

1327

1301

size_t sret;

1335

1309

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

1336

1310

"abcdefghijklmnopqrstuvwxyz"

1337

1311

"0123456789"

1338

"_.-");

1312

"_-");

1339

1313

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

1340

1314

/* Contains non-allowed characters */

1341

1315

if(debug){

1359

1333

}

1360

1334

return 0;

1361

1335

}

1362

free(fullname);

1363

1336

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

1364

1337

/* Not a regular file */

1365

1338

if(debug){

1383

1356

return 1;

1384

1357

}

1385

1358

1386

__attribute__((nonnull, warn_unused_result))

1387

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

1360

mandos_context *mc){

1389

1361

int ret;

1393

1365

1394

1366

while(true){

1395

1367

if(mc->current_server == NULL){

1396

if(debug){

1368

if (debug){

1397

1369

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

1398

1370

" No timeout!\n");

1399

1371

}

1400

1372

ret = avahi_simple_poll_iterate(s, -1);

1401

1373

} else {

1402

if(debug){

1374

if (debug){

1403

1375

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

1404

1376

" it, or wait\n");

1405

1377

}

1422

1394

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

1423

1395

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

1424

1396

1425

if(debug){

1397

if (debug){

1426

1398

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

1427

1399

block_time);

1428

1400

}

1450

1422

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

1451

1423

}

1452

1424

if(ret != 0){

1453

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

1425

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

1454

1426

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

1455

1427

}

1456

1428

}

1458

1430

}

1459

1431

1460

1432

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

1461

__attribute__((warn_unused_result))

1462

1433

error_t raise_privileges(void){

1463

1434

error_t old_errno = errno;

1464

1435

error_t ret_errno = 0;

1471

1442

}

1472

1443

1473

1444

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

1474

__attribute__((warn_unused_result))

1475

1445

error_t raise_privileges_permanently(void){

1476

1446

error_t old_errno = errno;

1477

1447

error_t ret_errno = raise_privileges();

1488

1458

}

1489

1459

1490

1460

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

1491

__attribute__((warn_unused_result))

1492

1461

error_t lower_privileges(void){

1493

1462

error_t old_errno = errno;

1494

1463

error_t ret_errno = 0;

1501

1470

}

1502

1471

1503

1472

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

1473

error_t lower_privileges_permanently(void){

1506

1474

error_t old_errno = errno;

1507

1475

error_t ret_errno = 0;

1513

1481

return ret_errno;

1514

1482

}

1515

1483

1516

__attribute__((nonnull))

1517

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

1484

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

1518

1485

const float delay){

1519

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1520

1489

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

1521

1490

alphasort);

1522

1491

if(numhooks == -1){

1529

1498

perror_plus("scandir");

1530

1499

}

1531

1500

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

1501

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

1535

1502

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

1536

1503

direntry = direntries[i];

1548

1515

if(hook_pid == 0){

1549

1516

/* Child */

1550

1517

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1518

raise_privileges_permanently();

1555

1519

/* Set group */

1556

1520

errno = 0;

1557

1521

ret = setgid(0);

1558

1522

if(ret == -1){

1559

1523

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

1524

}

1562

1525

/* Reset supplementary groups */

1563

1526

errno = 0;

1564

1527

ret = setgroups(0, NULL);

1565

1528

if(ret == -1){

1566

1529

perror_plus("setgroups");

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

}

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1584

1534

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

1585

1535

if(ret == -1){

1586

1536

perror_plus("setenv");

1602

1552

_exit(EX_OSERR);

1603

1553

}

1604

1554

char *delaystring;

1605

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

1555

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

1606

1556

if(ret == -1){

1607

1557

perror_plus("asprintf");

1608

1558

_exit(EX_OSERR);

1661

1611

}

1662

1612

close(devnull);

1663

1613

}

1614

return true;

1664

1615

}

1665

1616

1666

__attribute__((nonnull, warn_unused_result))

1667

1617

error_t bring_up_interface(const char *const interface,

1668

1618

const float delay){

1619

int sd = -1;

1669

1620

error_t old_errno = errno;

1670

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1671

1623

struct ifreq network;

1672

1624

unsigned int if_index = if_nametoindex(interface);

1673

1625

if(if_index == 0){

1682

1634

}

1683

1635

1684

1636

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1637

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

1687

1638

ret_errno = errno;

1688

1639

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

1689

1640

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

1690

errno = old_errno;

1691

1641

return ret_errno;

1692

1642

}

1693

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

1643

network.ifr_flags |= IFF_UP;

1694

1644

1695

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

1696

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1697

1647

ret_errno = errno;

1698

1648

perror_plus("socket");

1699

1649

errno = old_errno;

1700

1650

return ret_errno;

1701

1651

}

1702

1652

1703

1653

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1654

close(sd);

1708

1655

errno = old_errno;

1709

1656

return EINTR;

1710

1657

}

1714

1661

interface);

1715

1662

}

1716

1663

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1664

/* Raise priviliges */

1665

raise_privileges();

1722

1666

1723

1667

#ifdef __linux__

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

}

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1735

1675

}

1736

1676

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

1739

1679

#ifdef __linux__

1740

1680

if(restore_loglevel){

1741

1681

ret_linux = klogctl(7, NULL, 0);

1745

1685

}

1746

1686

#endif /* __linux__ */

1747

1687

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

}

1688

/* Lower privileges */

1689

lower_privileges();

1757

1690

1758

1691

/* Close the socket */

1759

1692

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

1762

1695

}

1763

1696

1764

1697

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1698

errno = ret_errno;

1766

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

1700

errno = old_errno;

1768

return ioctl_errno;

1701

return ret_errno;

1769

1702

}

1770

1703

} else if(debug){

1771

1704

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

1789

1722

return 0;

1790

1723

}

1791

1724

1792

__attribute__((nonnull, warn_unused_result))

1793

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1794

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1795

1730

struct ifreq network;

1796

1731

unsigned int if_index = if_nametoindex(interface);

1797

1732

if(if_index == 0){

1800

1735

return ENXIO;

1801

1736

}

1802

1737

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

1738

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

1805

1739

ret_errno = errno;

1806

1740

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

1807

1741

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

1808

errno = old_errno;

1809

1742

return ret_errno;

1810

1743

}

1811

1744

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

1812

1745

1813

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

1814

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1815

1748

ret_errno = errno;

1816

1749

perror_plus("socket");

1817

1750

errno = old_errno;

1823

1756

interface);

1824

1757

}

1825

1758

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

}

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1844

1767

1845

1768

/* Close the socket */

1846

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

1769

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

1847

1770

if(ret == -1){

1848

1771

perror_plus("close");

1849

1772

}

1850

1773

1851

1774

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1775

errno = ret_errno;

1853

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

1777

errno = old_errno;

1855

return ioctl_errno;

1778

return ret_errno;

1856

1779

}

1857

1780

} else if(debug){

1858

1781

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

1866

1789

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

1867

1790

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

1868

1791

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

1869

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

1792

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

1870

1793

.interfaces = NULL, .interfaces_size = 0 };

1871

1794

AvahiSServiceBrowser *sb = NULL;

1872

1795

error_t ret_errno;

1876

1799

int exitcode = EXIT_SUCCESS;

1877

1800

char *interfaces_to_take_down = NULL;

1878

1801

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

1882

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1883

1805

const char *seckey = PATHDIR "/" SECKEY;

1884

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1885

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1886

1809

1887

1810

bool gnutls_initialized = false;

1888

1811

bool gpgme_initialized = false;

2066

1989

/* Work around Debian bug #633582:

2067

1990

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

2068

1991

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 {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2075

1994

struct stat st;

2076

1995

2077

1996

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

2117

2036

}

2118

2037

2119

2038

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2039

lower_privileges();

2125

2040

}

2126

2041

}

2127

2042

2151

2066

goto end;

2152

2067

}

2153

2068

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2158

2077

}

2159

2078

2160

2079

if(not debug){

2248

2167

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

2249

2168

direntries[i]->d_name);

2250

2169

if(ret_errno != 0){

2251

errno = ret_errno;

2252

2170

perror_plus("argz_add");

2253

2171

continue;

2254

2172

}

2288

2206

break;

2289

2207

}

2290

2208

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2292

2210

if(not interface_was_up){

2293

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2294

2213

perror_plus("Failed to bring up interface");

2295

2214

} else {

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

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2302

2218

}

2303

2219

}

2304

2220

}

2333

2249

goto end;

2334

2250

}

2335

2251

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){

2252

if(mkdtemp(tempdir) == NULL){

2346

2253

perror_plus("mkdtemp");

2347

2254

goto end;

2348

2255

}

2256

tempdir_created = true;

2349

2257

2350

2258

if(quit_now){

2351

2259

goto end;

2426

2334

sleep((unsigned int)retry_interval);

2427

2335

}

2428

2336

2429

if(not quit_now){

2337

if (not quit_now){

2430

2338

exitcode = EXIT_SUCCESS;

2431

2339

}

2432

2340

2487

2395

if(debug){

2488

2396

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

2489

2397

}

2490

2398

2491

2399

ret = avahi_loop_with_timeout(simple_poll,

2492

2400

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

2493

2401

if(debug){

2534

2442

}

2535

2443

}

2536

2444

2537

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2538

2446

{

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

}

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2571

2472

}

2572

2473

2573

2474

free(interfaces_to_take_down);

2574

2475

free(interfaces_hooks);

2575

2476

2576

2477

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

2577

if(tempdir != NULL){

2478

if(tempdir_created){

2578

2479

struct dirent **direntries = NULL;

2579

2480

struct dirent *direntry = NULL;

2580

2481

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

2581

2482

alphasort);

2582

if(numentries > 0){

2483

if (numentries > 0){

2583

2484

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

2584

2485

direntry = direntries[i];

2585

2486

char *fullname = NULL;

2597

2498

free(fullname);

2598

2499

}

2599

2500

}

2600

2501

2601

2502

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

2602

2503

free(direntries);

2603

if(numentries == -1){

2504

if (numentries == -1){

2604

2505

perror_plus("scandir");

2605

2506

}

2606

2507

ret = rmdir(tempdir);