/mandos/trunk : revision 713

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

72

73

*/

73

74

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

74

75

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

75

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

76

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

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

77

79

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

78

80

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

79

81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

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

138

142

static const char sys_class_net[] = "/sys/class/net";

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

180

185

perror(print_text);

181

186

}

182

187

183

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

188

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

184

189

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

185

190

va_list ap;

186

191

va_start (ap, format);

187

192

188

193

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

189

194

program_invocation_short_name));

190

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

195

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

191

196

}

192

197

193

198

/*

195

200

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

196

201

* "buffer_length" is how much is already used.

197

202

*/

203

__attribute__((nonnull, warn_unused_result))

198

204

size_t incbuffer(char **buffer, size_t buffer_length,

199

205

size_t buffer_capacity){

200

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

203

213

return 0;

204

214

}

215

*buffer = new_buf;

205

216

buffer_capacity += BUFFER_SIZE;

206

217

}

207

218

return buffer_capacity;

208

219

}

209

220

210

221

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

222

__attribute__((nonnull, warn_unused_result))

211

223

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

212

224

int af, server **current_server){

213

225

int ret;

222

234

.af = af };

223

235

if(new_server->ip == NULL){

224

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

225

245

return false;

226

246

}

227

247

/* Special case of first server */

229

249

new_server->next = new_server;

230

250

new_server->prev = new_server;

231

251

*current_server = new_server;

232

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

233

252

} else {

253

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

234

254

new_server->next = *current_server;

235

255

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

236

256

new_server->prev->next = new_server;

237

257

(*current_server)->prev = new_server;

238

258

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

259

return true;

245

260

}

246

261

247

262

/*

248

263

* Initialize GPGME.

249

264

*/

250

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

251

const char *tempdir, mandos_context *mc){

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

252

270

gpgme_error_t rc;

253

271

gpgme_engine_info_t engine_info;

254

272

255

273

/*

256

274

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

257

275

*/

258

bool import_key(const char *filename){

276

bool import_key(const char * const filename){

259

277

int ret;

260

278

int fd;

261

279

gpgme_data_t pgp_data;

342

360

* Decrypt OpenPGP data.

343

361

* Returns -1 on error

344

362

*/

363

__attribute__((nonnull, warn_unused_result))

345

364

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

365

size_t crypto_size,

347

366

char **plaintext,

467

486

return plaintext_length;

468

487

}

469

488

470

static const char * safer_gnutls_strerror(int value){

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

471

491

const char *ret = gnutls_strerror(value);

472

492

if(ret == NULL)

473

493

ret = "(unknown)";

475

495

}

476

496

477

497

/* GnuTLS log function callback */

498

__attribute__((nonnull))

478

499

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

479

500

const char* string){

480

501

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

481

502

}

482

503

504

__attribute__((nonnull, warn_unused_result))

483

505

static int init_gnutls_global(const char *pubkeyfilename,

484

506

const char *seckeyfilename,

485

507

mandos_context *mc){

559

581

return -1;

560

582

}

561

583

584

__attribute__((nonnull, warn_unused_result))

562

585

static int init_gnutls_session(gnutls_session_t *session,

563

586

mandos_context *mc){

564

587

int ret;

621

644

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

622

645

623

646

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

624

648

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

625

649

AvahiIfIndex if_index,

626

650

int af, mandos_context *mc){

627

651

int ret, tcp_sd = -1;

628

652

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

653

struct sockaddr_storage to;

633

654

char *buffer = NULL;

634

655

char *decrypted_buffer = NULL;

635

656

size_t buffer_length = 0;

659

680

return -1;

660

681

}

661

682

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

662

715

ret = init_gnutls_session(&session, mc);

663

716

if(ret != 0){

664

717

return -1;

684

737

685

738

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

686

739

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

740

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

741

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

689

742

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

743

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

744

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

692

745

}

693

746

if(ret < 0 ){

694

747

int e = errno;

703

756

goto mandos_end;

704

757

}

705

758

if(af == AF_INET6){

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*/

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

710

762

if(if_index == AVAHI_IF_UNSPEC){

711

763

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

712

764

" incomplete without a network interface\n");

714

766

goto mandos_end;

715

767

}

716

768

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

769

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

718

770

}

719

771

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

772

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

723

773

}

724

774

725

775

if(quit_now){

742

792

}

743

793

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

794

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

795

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

749

800

} else {

750

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

751

sizeof(addrstr));

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

752

805

}

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

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

759

812

}

760

813

}

761

814

765

818

}

766

819

767

820

if(af == AF_INET6){

768

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

821

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

822

sizeof(struct sockaddr_in6));

769

823

} else {

770

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

824

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

825

sizeof(struct sockaddr_in));

771

826

}

772

827

if(ret < 0){

773

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

828

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

774

829

int e = errno;

775

830

perror_plus("connect");

776

831

errno = e;

991

1046

return retval;

992

1047

}

993

1048

1049

__attribute__((nonnull))

994

1050

static void resolve_callback(AvahiSServiceResolver *r,

995

1051

AvahiIfIndex interface,

996

1052

AvahiProtocol proto,

1004

1060

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1062

flags,

1007

void* mc){

1063

void *mc){

1008

1064

if(r == NULL){

1009

1065

return;

1010

1066

}

1063

1119

const char *domain,

1064

1120

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1121

flags,

1066

void* mc){

1122

void *mc){

1067

1123

if(b == NULL){

1068

1124

return;

1069

1125

}

1129

1185

errno = old_errno;

1130

1186

}

1131

1187

1188

__attribute__((nonnull, warn_unused_result))

1132

1189

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

1133

1190

int ret;

1134

1191

error_t ret_errno;

1153

1210

return true;

1154

1211

}

1155

1212

1213

__attribute__((nonnull, warn_unused_result))

1156

1214

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

1157

1215

1158

1216

/* Reject the loopback device */

1200

1258

* corresponds to an acceptable network device.

1201

1259

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

1202

1260

*/

1261

__attribute__((nonnull, warn_unused_result))

1203

1262

int good_interface(const struct dirent *if_entry){

1204

1263

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

1205

1264

return 0;

1223

1282

/*

1224

1283

* This function determines if a network interface is up.

1225

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1226

1286

bool interface_is_up(const char *interface){

1227

1287

struct ifreq ifr;

1228

1288

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

1239

1299

/*

1240

1300

* This function determines if a network interface is running

1241

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1242

1303

bool interface_is_running(const char *interface){

1243

1304

struct ifreq ifr;

1244

1305

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

1252

1313

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

1253

1314

}

1254

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

1255

1317

int notdotentries(const struct dirent *direntry){

1256

1318

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

1257

1319

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

1264

1326

}

1265

1327

1266

1328

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

1329

__attribute__((nonnull, warn_unused_result))

1267

1330

int runnable_hook(const struct dirent *direntry){

1268

1331

int ret;

1269

1332

size_t sret;

1277

1340

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

1278

1341

"abcdefghijklmnopqrstuvwxyz"

1279

1342

"0123456789"

1280

"_-");

1343

"_.-");

1281

1344

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

1282

1345

/* Contains non-allowed characters */

1283

1346

if(debug){

1287

1350

return 0;

1288

1351

}

1289

1352

1290

char *fullname = NULL;

1291

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1292

if(ret < 0){

1293

perror_plus("asprintf");

1294

return 0;

1295

}

1296

1297

ret = stat(fullname, &st);

1353

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1298

1354

if(ret == -1){

1299

1355

if(debug){

1300

1356

perror_plus("Could not stat hook");

1324

1380

return 1;

1325

1381

}

1326

1382

1383

__attribute__((nonnull, warn_unused_result))

1327

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

1385

mandos_context *mc){

1329

1386

int ret;

1333

1390

1334

1391

while(true){

1335

1392

if(mc->current_server == NULL){

1336

if (debug){

1393

if(debug){

1337

1394

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

1338

1395

" No timeout!\n");

1339

1396

}

1340

1397

ret = avahi_simple_poll_iterate(s, -1);

1341

1398

} else {

1342

if (debug){

1399

if(debug){

1343

1400

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

1344

1401

" it, or wait\n");

1345

1402

}

1362

1419

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

1363

1420

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

1364

1421

1365

if (debug){

1422

if(debug){

1366

1423

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

1367

1424

block_time);

1368

1425

}

1390

1447

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

1391

1448

}

1392

1449

if(ret != 0){

1393

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

1450

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

1394

1451

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

1395

1452

}

1396

1453

}

1398

1455

}

1399

1456

1400

1457

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

1458

__attribute__((warn_unused_result))

1401

1459

error_t raise_privileges(void){

1402

1460

error_t old_errno = errno;

1403

1461

error_t ret_errno = 0;

1404

1462

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

1405

1463

ret_errno = errno;

1406

perror_plus("seteuid");

1407

1464

}

1408

1465

errno = old_errno;

1409

1466

return ret_errno;

1410

1467

}

1411

1468

1412

1469

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

1470

__attribute__((warn_unused_result))

1413

1471

error_t raise_privileges_permanently(void){

1414

1472

error_t old_errno = errno;

1415

1473

error_t ret_errno = raise_privileges();

1419

1477

}

1420

1478

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

1421

1479

ret_errno = errno;

1422

perror_plus("seteuid");

1423

1480

}

1424

1481

errno = old_errno;

1425

1482

return ret_errno;

1426

1483

}

1427

1484

1428

1485

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

1486

__attribute__((warn_unused_result))

1429

1487

error_t lower_privileges(void){

1430

1488

error_t old_errno = errno;

1431

1489

error_t ret_errno = 0;

1432

1490

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

1433

1491

ret_errno = errno;

1434

perror_plus("seteuid");

1435

1492

}

1436

1493

errno = old_errno;

1437

1494

return ret_errno;

1438

1495

}

1439

1496

1440

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1441

1499

error_t lower_privileges_permanently(void){

1442

1500

error_t old_errno = errno;

1443

1501

error_t ret_errno = 0;

1444

1502

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

1445

1503

ret_errno = errno;

1446

perror_plus("setuid");

1447

1504

}

1448

1505

errno = old_errno;

1449

1506

return ret_errno;

1450

1507

}

1451

1508

1452

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

1509

__attribute__((nonnull))

1510

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

1453

1511

const float delay){

1454

struct dirent **direntries;

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1539

if(numhooks == -1){

1540

perror_plus("scandir");

1541

return;

1542

}

1455

1543

struct dirent *direntry;

1456

1544

int ret;

1457

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

1458

alphasort);

1459

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1550

direntry->d_name);

1467

1551

}

1468

} else {

1469

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

1470

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

1471

direntry = direntries[i];

1472

char *fullname = NULL;

1473

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1474

if(ret < 0){

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

ret = setenv("DEVICE", interface, 1);

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

ret = setenv("MODE", mode, 1);

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1475

1613

perror_plus("asprintf");

1476

continue;

1477

}

1478

if(debug){

1479

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1480

direntry->d_name);

1481

}

1482

pid_t hook_pid = fork();

1483

if(hook_pid == 0){

1484

/* Child */

1485

/* Raise privileges */

1486

raise_privileges_permanently();

1487

/* Set group */

1488

errno = 0;

1489

ret = setgid(0);

1490

if(ret == -1){

1491

perror_plus("setgid");

1492

}

1493

/* Reset supplementary groups */

1494

errno = 0;

1495

ret = setgroups(0, NULL);

1496

if(ret == -1){

1497

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1502

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

1503

if(ret == -1){

1504

perror_plus("setenv");

1505

_exit(EX_OSERR);

1506

}

1507

ret = setenv("DEVICE", interface, 1);

1508

if(ret == -1){

1509

perror_plus("setenv");

1510

_exit(EX_OSERR);

1511

}

1512

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

ret = setenv("MODE", mode, 1);

1518

if(ret == -1){

1519

perror_plus("setenv");

1520

_exit(EX_OSERR);

1521

}

1522

char *delaystring;

1523

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

1524

if(ret == -1){

1525

perror_plus("asprintf");

1526

_exit(EX_OSERR);

1527

}

1528

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

1529

if(ret == -1){

1530

free(delaystring);

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1534

1618

free(delaystring);

1535

if(connect_to != NULL){

1536

ret = setenv("CONNECT", connect_to, 1);

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

}

1542

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1543

perror_plus("execl");

1544

_exit(EXIT_FAILURE);

1545

}

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

ret = setenv("CONNECT", connect_to, 1);

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1546

1662

} else {

1547

int status;

1548

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

1549

perror_plus("waitpid");

1550

free(fullname);

1551

continue;

1552

}

1553

if(WIFEXITED(status)){

1554

if(WEXITSTATUS(status) != 0){

1555

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

1556

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

1557

WEXITSTATUS(status));

1558

free(fullname);

1559

continue;

1560

}

1561

} else if(WIFSIGNALED(status)){

1562

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

1563

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

1564

WTERMSIG(status));

1565

free(fullname);

1566

continue;

1567

} else {

1568

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

1569

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

1570

free(fullname);

1571

continue;

1572

}

1573

}

1574

free(fullname);

1575

if(debug){

1576

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

1577

direntry->d_name);

1578

}

1579

}

1580

close(devnull);

1581

}

1582

return true;

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1583

1680

}

1584

1681

1682

__attribute__((nonnull, warn_unused_result))

1585

1683

error_t bring_up_interface(const char *const interface,

1586

1684

const float delay){

1587

int sd = -1;

1588

1685

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1686

int ret;

1591

1687

struct ifreq network;

1592

1688

unsigned int if_index = if_nametoindex(interface);

1593

1689

if(if_index == 0){

1602

1698

}

1603

1699

1604

1700

if(not interface_is_up(interface)){

1605

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

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1606

1703

ret_errno = errno;

1607

1704

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

1608

1705

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

1706

errno = old_errno;

1609

1707

return ret_errno;

1610

1708

}

1611

network.ifr_flags |= IFF_UP;

1709

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

1612

1710

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1711

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

1712

if(sd == -1){

1615

1713

ret_errno = errno;

1616

1714

perror_plus("socket");

1617

1715

errno = old_errno;

1618

1716

return ret_errno;

1619

1717

}

1620

1718

1621

1719

if(quit_now){

1622

close(sd);

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1623

1724

errno = old_errno;

1624

1725

return EINTR;

1625

1726

}

1629

1730

interface);

1630

1731

}

1631

1732

1632

/* Raise priviliges */

1633

raise_privileges();

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1634

1739

1635

1740

#ifdef __linux__

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");

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1643

1752

}

1644

1753

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1754

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

1755

ioctl_errno = errno;

1647

1756

#ifdef __linux__

1648

1757

if(restore_loglevel){

1649

1758

ret_linux = klogctl(7, NULL, 0);

1653

1762

}

1654

1763

#endif /* __linux__ */

1655

1764

1656

/* Lower privileges */

1657

lower_privileges();

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1658

1774

1659

1775

/* Close the socket */

1660

1776

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

1663

1779

}

1664

1780

1665

1781

if(ret_setflags == -1){

1666

errno = ret_errno;

1782

errno = ioctl_errno;

1667

1783

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

1784

errno = old_errno;

1669

return ret_errno;

1785

return ioctl_errno;

1670

1786

}

1671

1787

} else if(debug){

1672

1788

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

1690

1806

return 0;

1691

1807

}

1692

1808

1809

__attribute__((nonnull, warn_unused_result))

1693

1810

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

1811

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

1812

struct ifreq network;

1699

1813

unsigned int if_index = if_nametoindex(interface);

1700

1814

if(if_index == 0){

1703

1817

return ENXIO;

1704

1818

}

1705

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1706

1821

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

1707

1822

ret_errno = errno;

1708

1823

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

1709

1824

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

1825

errno = old_errno;

1710

1826

return ret_errno;

1711

1827

}

1712

1828

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

1713

1829

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1830

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

1831

if(sd == -1){

1716

1832

ret_errno = errno;

1717

1833

perror_plus("socket");

1718

1834

errno = old_errno;

1724

1840

interface);

1725

1841

}

1726

1842

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();

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1735

1862

1736

1863

/* Close the socket */

1737

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

1864

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

1738

1865

if(ret == -1){

1739

1866

perror_plus("close");

1740

1867

}

1741

1868

1742

1869

if(ret_setflags == -1){

1743

errno = ret_errno;

1870

errno = ioctl_errno;

1744

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

1872

errno = old_errno;

1746

return ret_errno;

1873

return ioctl_errno;

1747

1874

}

1748

1875

} else if(debug){

1749

1876

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

1757

1884

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

1758

1885

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

1759

1886

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

1760

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

1887

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

1761

1888

.interfaces = NULL, .interfaces_size = 0 };

1762

1889

AvahiSServiceBrowser *sb = NULL;

1763

1890

error_t ret_errno;

1767

1894

int exitcode = EXIT_SUCCESS;

1768

1895

char *interfaces_to_take_down = NULL;

1769

1896

size_t interfaces_to_take_down_size = 0;

1770

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

1771

bool tempdir_created = false;

1897

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

1898

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

1899

char *tempdir = NULL;

1772

1900

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1901

const char *seckey = PATHDIR "/" SECKEY;

1774

1902

const char *pubkey = PATHDIR "/" PUBKEY;

1775

1903

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1904

1778

1905

bool gnutls_initialized = false;

1779

1906

bool gpgme_initialized = false;

1957

2084

/* Work around Debian bug #633582:

1958

2085

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

1959

2086

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

1962

2093

struct stat st;

1963

2094

1964

2095

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

2004

2135

}

2005

2136

2006

2137

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2011

2142

}

2012

2143

}

2013

2144

}

2014

2145

2015

/* Remove empty interface names */

2146

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

2016

2147

{

2017

2148

char *interface = NULL;

2018

2149

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

2019

2150

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

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

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2022

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2023

2155

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

2024

2156

}

2030

2162

2031

2163

/* Run network hooks */

2032

2164

{

2033

2034

2165

if(mc.interfaces != NULL){

2035

2166

interfaces_hooks = malloc(mc.interfaces_size);

2036

2167

if(interfaces_hooks == NULL){

2038

2169

goto end;

2039

2170

}

2040

2171

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

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

}

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

2049

2176

}

2050

2177

2051

2178

if(not debug){

2129

2256

2130

2257

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

2131

2258

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2259

struct dirent **direntries = NULL;

2133

2260

/* Look for any good interfaces */

2134

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2135

2262

alphasort);

2139

2266

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

2140

2267

direntries[i]->d_name);

2141

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2142

2270

perror_plus("argz_add");

2143

2271

continue;

2144

2272

}

2149

2277

}

2150

2278

free(direntries);

2151

2279

} else {

2152

free(direntries);

2280

if(ret == 0){

2281

free(direntries);

2282

}

2153

2283

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

2154

2284

exitcode = EXIT_FAILURE;

2155

2285

goto end;

2156

2286

}

2157

2287

}

2158

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

2306

}

2307

}

2308

break;

2309

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2159

2330

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

2160

2331

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

2161

2332

if(debug){

2165

2336

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

2166

2337

}

2167

2338

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)){

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

2185

}

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

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

2192

}

2193

}

2194

2195

2339

if(quit_now){

2196

2340

goto end;

2197

2341

}

2209

2353

goto end;

2210

2354

}

2211

2355

2212

if(mkdtemp(tempdir) == NULL){

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2213

2366

perror_plus("mkdtemp");

2214

2367

goto end;

2215

2368

}

2216

tempdir_created = true;

2217

2369

2218

2370

if(quit_now){

2219

2371

goto end;

2255

2407

exitcode = EX_USAGE;

2256

2408

goto end;

2257

2409

}

2258

2410

2259

2411

if(quit_now){

2260

2412

goto end;

2261

2413

}

2291

2443

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

2292

2444

(int)retry_interval);

2293

2445

}

2294

sleep((int)retry_interval);

2446

sleep((unsigned int)retry_interval);

2295

2447

}

2296

2448

2297

if (not quit_now){

2449

if(not quit_now){

2298

2450

exitcode = EXIT_SUCCESS;

2299

2451

}

2300

2452

2355

2507

if(debug){

2356

2508

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

2357

2509

}

2358

2510

2359

2511

ret = avahi_loop_with_timeout(simple_poll,

2360

2512

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

2361

2513

if(debug){

2370

2522

}

2371

2523

2372

2524

/* Cleanup things */

2525

free(mc.interfaces);

2526

2373

2527

if(sb != NULL)

2374

2528

avahi_s_service_browser_free(sb);

2375

2529

2400

2554

}

2401

2555

}

2402

2556

2403

/* Re-raise priviliges */

2557

/* Re-raise privileges */

2404

2558

{

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();

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2592

}

2430

2593

}

2431

2594

2432

2595

free(interfaces_to_take_down);

2433

2596

free(interfaces_hooks);

2434

2597

2435

2598

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

2436

if(tempdir_created){

2599

if(tempdir != NULL){

2437

2600

struct dirent **direntries = NULL;

2438

struct dirent *direntry = NULL;

2439

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

2440

alphasort);

2441

if (numentries > 0){

2442

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

2443

direntry = direntries[i];

2444

char *fullname = NULL;

2445

ret = asprintf(&fullname, "%s/%s", tempdir,

2446

direntry->d_name);

2447

if(ret < 0){

2448

perror_plus("asprintf");

2449

continue;

2450

}

2451

ret = remove(fullname);

2452

if(ret == -1){

2453

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2454

strerror(errno));

2455

}

2456

free(fullname);

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2457

2637

}

2458

}

2459

2460

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

2461

free(direntries);

2462

if (numentries == -1){

2463

perror_plus("scandir");

2464

}

2465

ret = rmdir(tempdir);

2466

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

2467

perror_plus("rmdir");

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2468

2639

}

2469

2640

}

2470

2641