/mandos/trunk : revision 610

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

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){

1382

1356

return 1;

1383

1357

}

1384

1358

1385

__attribute__((nonnull, warn_unused_result))

1386

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

1360

mandos_context *mc){

1388

1361

int ret;

1392

1365

1393

1366

while(true){

1394

1367

if(mc->current_server == NULL){

1395

if(debug){

1368

if (debug){

1396

1369

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

1397

1370

" No timeout!\n");

1398

1371

}

1399

1372

ret = avahi_simple_poll_iterate(s, -1);

1400

1373

} else {

1401

if(debug){

1374

if (debug){

1402

1375

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

1403

1376

" it, or wait\n");

1404

1377

}

1421

1394

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

1422

1395

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

1423

1396

1424

if(debug){

1397

if (debug){

1425

1398

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

1426

1399

block_time);

1427

1400

}

1449

1422

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

1450

1423

}

1451

1424

if(ret != 0){

1452

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

1425

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

1453

1426

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

1454

1427

}

1455

1428

}

1457

1430

}

1458

1431

1459

1432

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

1460

__attribute__((warn_unused_result))

1461

1433

error_t raise_privileges(void){

1462

1434

error_t old_errno = errno;

1463

1435

error_t ret_errno = 0;

1470

1442

}

1471

1443

1472

1444

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

1473

__attribute__((warn_unused_result))

1474

1445

error_t raise_privileges_permanently(void){

1475

1446

error_t old_errno = errno;

1476

1447

error_t ret_errno = raise_privileges();

1487

1458

}

1488

1459

1489

1460

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

1490

__attribute__((warn_unused_result))

1491

1461

error_t lower_privileges(void){

1492

1462

error_t old_errno = errno;

1493

1463

error_t ret_errno = 0;

1500

1470

}

1501

1471

1502

1472

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

1473

error_t lower_privileges_permanently(void){

1505

1474

error_t old_errno = errno;

1506

1475

error_t ret_errno = 0;

1512

1481

return ret_errno;

1513

1482

}

1514

1483

1515

__attribute__((nonnull))

1516

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

1484

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

1517

1485

const float delay){

1518

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1519

1489

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

1520

1490

alphasort);

1521

1491

if(numhooks == -1){

1528

1498

perror_plus("scandir");

1529

1499

}

1530

1500

} else {

1531

struct dirent *direntry;

1532

int ret;

1533

1501

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

1534

1502

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

1535

1503

direntry = direntries[i];

1547

1515

if(hook_pid == 0){

1548

1516

/* Child */

1549

1517

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1518

raise_privileges_permanently();

1554

1519

/* Set group */

1555

1520

errno = 0;

1556

1521

ret = setgid(0);

1557

1522

if(ret == -1){

1558

1523

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

1524

}

1561

1525

/* Reset supplementary groups */

1562

1526

errno = 0;

1563

1527

ret = setgroups(0, NULL);

1564

1528

if(ret == -1){

1565

1529

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1583

1534

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

1584

1535

if(ret == -1){

1585

1536

perror_plus("setenv");

1601

1552

_exit(EX_OSERR);

1602

1553

}

1603

1554

char *delaystring;

1604

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

1555

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

1605

1556

if(ret == -1){

1606

1557

perror_plus("asprintf");

1607

1558

_exit(EX_OSERR);

1660

1611

}

1661

1612

close(devnull);

1662

1613

}

1614

return true;

1663

1615

}

1664

1616

1665

__attribute__((nonnull, warn_unused_result))

1666

1617

error_t bring_up_interface(const char *const interface,

1667

1618

const float delay){

1619

int sd = -1;

1668

1620

error_t old_errno = errno;

1669

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1670

1623

struct ifreq network;

1671

1624

unsigned int if_index = if_nametoindex(interface);

1672

1625

if(if_index == 0){

1681

1634

}

1682

1635

1683

1636

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1637

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

1686

1638

ret_errno = errno;

1687

1639

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

1688

1640

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

1689

errno = old_errno;

1690

1641

return ret_errno;

1691

1642

}

1692

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

1643

network.ifr_flags |= IFF_UP;

1693

1644

1694

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

1695

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1696

1647

ret_errno = errno;

1697

1648

perror_plus("socket");

1698

1649

errno = old_errno;

1699

1650

return ret_errno;

1700

1651

}

1701

1652

1702

1653

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1654

close(sd);

1707

1655

errno = old_errno;

1708

1656

return EINTR;

1709

1657

}

1713

1661

interface);

1714

1662

}

1715

1663

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1664

/* Raise priviliges */

1665

raise_privileges();

1721

1666

1722

1667

#ifdef __linux__

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

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");

1734

1675

}

1735

1676

#endif /* __linux__ */

1736

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

1737

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

1738

1679

#ifdef __linux__

1739

1680

if(restore_loglevel){

1740

1681

ret_linux = klogctl(7, NULL, 0);

1744

1685

}

1745

1686

#endif /* __linux__ */

1746

1687

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1688

/* Lower privileges */

1689

lower_privileges();

1756

1690

1757

1691

/* Close the socket */

1758

1692

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

1761

1695

}

1762

1696

1763

1697

if(ret_setflags == -1){

1764

errno = ioctl_errno;

1698

errno = ret_errno;

1765

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1766

1700

errno = old_errno;

1767

return ioctl_errno;

1701

return ret_errno;

1768

1702

}

1769

1703

} else if(debug){

1770

1704

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

1788

1722

return 0;

1789

1723

}

1790

1724

1791

__attribute__((nonnull, warn_unused_result))

1792

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1793

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1794

1730

struct ifreq network;

1795

1731

unsigned int if_index = if_nametoindex(interface);

1796

1732

if(if_index == 0){

1799

1735

return ENXIO;

1800

1736

}

1801

1737

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1803

1738

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

1804

1739

ret_errno = errno;

1805

1740

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

1806

1741

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

1807

errno = old_errno;

1808

1742

return ret_errno;

1809

1743

}

1810

1744

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

1811

1745

1812

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

1813

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1814

1748

ret_errno = errno;

1815

1749

perror_plus("socket");

1816

1750

errno = old_errno;

1822

1756

interface);

1823

1757

}

1824

1758

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

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

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

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();

1843

1767

1844

1768

/* Close the socket */

1845

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

1769

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

1846

1770

if(ret == -1){

1847

1771

perror_plus("close");

1848

1772

}

1849

1773

1850

1774

if(ret_setflags == -1){

1851

errno = ioctl_errno;

1775

errno = ret_errno;

1852

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1853

1777

errno = old_errno;

1854

return ioctl_errno;

1778

return ret_errno;

1855

1779

}

1856

1780

} else if(debug){

1857

1781

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

1865

1789

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

1866

1790

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

1867

1791

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

1868

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

1792

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

1869

1793

.interfaces = NULL, .interfaces_size = 0 };

1870

1794

AvahiSServiceBrowser *sb = NULL;

1871

1795

error_t ret_errno;

1875

1799

int exitcode = EXIT_SUCCESS;

1876

1800

char *interfaces_to_take_down = NULL;

1877

1801

size_t interfaces_to_take_down_size = 0;

1878

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

1879

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

1880

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

1881

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1882

1805

const char *seckey = PATHDIR "/" SECKEY;

1883

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1884

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1885

1809

1886

1810

bool gnutls_initialized = false;

1887

1811

bool gpgme_initialized = false;

2065

1989

/* Work around Debian bug #633582:

2066

1990

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

2067

1991

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2074

1994

struct stat st;

2075

1995

2076

1996

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

2116

2036

}

2117

2037

2118

2038

/* Lower privileges */

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2123

}

2039

lower_privileges();

2124

2040

}

2125

2041

}

2126

2042

2150

2066

goto end;

2151

2067

}

2152

2068

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

2153

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

2154

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

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

}

2157

2077

}

2158

2078

2159

2079

if(not debug){

2247

2167

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

2248

2168

direntries[i]->d_name);

2249

2169

if(ret_errno != 0){

2250

errno = ret_errno;

2251

2170

perror_plus("argz_add");

2252

2171

continue;

2253

2172

}

2287

2206

break;

2288

2207

}

2289

2208

bool interface_was_up = interface_is_up(interface);

2290

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2291

2210

if(not interface_was_up){

2292

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2293

2213

perror_plus("Failed to bring up interface");

2294

2214

} else {

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2301

2218

}

2302

2219

}

2303

2220

}

2332

2249

goto end;

2333

2250

}

2334

2251

2335

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

2336

tempdir = mkdtemp(run_tempdir);

2337

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

2338

if(debug){

2339

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

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2345

2253

perror_plus("mkdtemp");

2346

2254

goto end;

2347

2255

}

2256

tempdir_created = true;

2348

2257

2349

2258

if(quit_now){

2350

2259

goto end;

2422

2331

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

2423

2332

(int)retry_interval);

2424

2333

}

2425

sleep((unsigned int)retry_interval);

2334

sleep((int)retry_interval);

2426

2335

}

2427

2336

2428

if(not quit_now){

2337

if (not quit_now){

2429

2338

exitcode = EXIT_SUCCESS;

2430

2339

}

2431

2340

2486

2395

if(debug){

2487

2396

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

2488

2397

}

2489

2398

2490

2399

ret = avahi_loop_with_timeout(simple_poll,

2491

2400

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

2492

2401

if(debug){

2533

2442

}

2534

2443

}

2535

2444

2536

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2537

2446

{

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

2541

} else {

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

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

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

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

2560

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

2561

" down\n");

2562

}

2563

}

2564

}

2565

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2569

}

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();

2570

2472

}

2571

2473

2572

2474

free(interfaces_to_take_down);

2573

2475

free(interfaces_hooks);

2574

2476

2575

2477

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

2576

if(tempdir != NULL){

2478

if(tempdir_created){

2577

2479

struct dirent **direntries = NULL;

2578

2480

struct dirent *direntry = NULL;

2579

2481

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

2580

2482

alphasort);

2581

if(numentries > 0){

2483

if (numentries > 0){

2582

2484

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

2583

2485

direntry = direntries[i];

2584

2486

char *fullname = NULL;

2596

2498

free(fullname);

2597

2499

}

2598

2500

}

2599

2501

2600

2502

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

2601

2503

free(direntries);

2602

if(numentries == -1){

2504

if (numentries == -1){

2603

2505

perror_plus("scandir");

2604

2506

}

2605

2507

ret = rmdir(tempdir);