/mandos/trunk : revision 753

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);

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){

213

219

}

214

220

215

221

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

222

__attribute__((nonnull, warn_unused_result))

216

223

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

217

224

int af, server **current_server){

218

225

int ret;

227

234

.af = af };

228

235

if(new_server->ip == NULL){

229

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

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

230

252

return false;

231

253

}

232

254

/* Special case of first server */

234

256

new_server->next = new_server;

235

257

new_server->prev = new_server;

236

258

*current_server = new_server;

237

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

238

259

} else {

260

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

239

261

new_server->next = *current_server;

240

262

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

241

263

new_server->prev->next = new_server;

242

264

(*current_server)->prev = new_server;

243

265

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

return false;

248

}

249

266

return true;

250

267

}

251

268

252

269

/*

253

270

* Initialize GPGME.

254

271

*/

255

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

256

const char *tempdir, mandos_context *mc){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

257

277

gpgme_error_t rc;

258

278

gpgme_engine_info_t engine_info;

259

279

260

280

/*

261

281

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

262

282

*/

263

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

264

284

int ret;

265

285

int fd;

266

286

gpgme_data_t pgp_data;

347

367

* Decrypt OpenPGP data.

348

368

* Returns -1 on error

349

369

*/

370

__attribute__((nonnull, warn_unused_result))

350

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

351

372

size_t crypto_size,

352

373

char **plaintext,

472

493

return plaintext_length;

473

494

}

474

495

475

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

476

505

const char *ret = gnutls_strerror(value);

477

if(ret == NULL)

478

ret = "(unknown)";

479

return ret;

506

return safe_string(ret);

480

507

}

481

508

482

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

483

511

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

484

512

const char* string){

485

513

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

486

514

}

487

515

516

__attribute__((nonnull, warn_unused_result))

488

517

static int init_gnutls_global(const char *pubkeyfilename,

489

518

const char *seckeyfilename,

490

519

mandos_context *mc){

491

520

int ret;

521

unsigned int uret;

492

522

493

523

if(debug){

494

524

fprintf_plus(stderr, "Initializing GnuTLS\n");

545

575

safer_gnutls_strerror(ret));

546

576

goto globalfail;

547

577

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

548

679

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

549

680

if(ret != GNUTLS_E_SUCCESS){

550

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

551

safer_gnutls_strerror(ret));

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

552

683

goto globalfail;

553

684

}

554

685

564

695

return -1;

565

696

}

566

697

698

__attribute__((nonnull, warn_unused_result))

567

699

static int init_gnutls_session(gnutls_session_t *session,

568

700

mandos_context *mc){

569

701

int ret;

626

758

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

627

759

628

760

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

629

762

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

630

763

AvahiIfIndex if_index,

631

764

int af, mandos_context *mc){

632

765

int ret, tcp_sd = -1;

633

766

ssize_t sret;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

767

struct sockaddr_storage to;

638

768

char *buffer = NULL;

639

769

char *decrypted_buffer = NULL;

640

770

size_t buffer_length = 0;

721

851

722

852

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

723

853

if(af == AF_INET6){

724

to.in6.sin6_family = (sa_family_t)af;

725

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

854

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

855

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

726

856

} else { /* IPv4 */

727

to.in.sin_family = (sa_family_t)af;

728

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

857

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

858

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

729

859

}

730

860

if(ret < 0 ){

731

861

int e = errno;

740

870

goto mandos_end;

741

871

}

742

872

if(af == AF_INET6){

743

to.in6.sin6_port = htons(port);

744

#ifdef __GNUC__

745

#pragma GCC diagnostic push

746

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

747

#endif

748

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

749

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

750

#ifdef __GNUC__

751

#pragma GCC diagnostic pop

752

#endif

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

753

876

if(if_index == AVAHI_IF_UNSPEC){

754

877

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

755

878

" incomplete without a network interface\n");

757

880

goto mandos_end;

758

881

}

759

882

/* Set the network interface number as scope */

760

to.in6.sin6_scope_id = (uint32_t)if_index;

883

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

761

884

}

762

885

} else {

763

to.in.sin_port = htons(port);

886

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

764

887

}

765

888

766

889

if(quit_now){

783

906

}

784

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

785

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

const char *pcret;

787

909

if(af == AF_INET6){

788

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

789

sizeof(addrstr));

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

790

914

} else {

791

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

792

sizeof(addrstr));

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

793

919

}

794

if(pcret == NULL){

795

perror_plus("inet_ntop");

796

} else {

797

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

798

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

799

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

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

924

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

925

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

800

926

}

801

927

}

802

928

806

932

}

807

933

808

934

if(af == AF_INET6){

809

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

935

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

936

sizeof(struct sockaddr_in6));

810

937

} else {

811

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

938

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

939

sizeof(struct sockaddr_in));

812

940

}

813

941

if(ret < 0){

814

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

942

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

815

943

int e = errno;

816

944

perror_plus("connect");

817

945

errno = e;

1032

1160

return retval;

1033

1161

}

1034

1162

1163

__attribute__((nonnull))

1035

1164

static void resolve_callback(AvahiSServiceResolver *r,

1036

1165

AvahiIfIndex interface,

1037

1166

AvahiProtocol proto,

1045

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

1046

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1047

1176

flags,

1048

void* mc){

1177

void *mc){

1049

1178

if(r == NULL){

1050

1179

return;

1051

1180

}

1054

1183

timed out */

1055

1184

1056

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1057

1187

return;

1058

1188

}

1059

1189

1104

1234

const char *domain,

1105

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1106

1236

flags,

1107

void* mc){

1237

void *mc){

1108

1238

if(b == NULL){

1109

1239

return;

1110

1240

}

1170

1300

errno = old_errno;

1171

1301

}

1172

1302

1303

__attribute__((nonnull, warn_unused_result))

1173

1304

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

1174

1305

int ret;

1175

1306

error_t ret_errno;

1194

1325

return true;

1195

1326

}

1196

1327

1328

__attribute__((nonnull, warn_unused_result))

1197

1329

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

1198

1330

1199

1331

/* Reject the loopback device */

1241

1373

* corresponds to an acceptable network device.

1242

1374

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

1243

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1244

1377

int good_interface(const struct dirent *if_entry){

1245

1378

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

1246

1379

return 0;

1264

1397

/*

1265

1398

* This function determines if a network interface is up.

1266

1399

*/

1400

__attribute__((nonnull, warn_unused_result))

1267

1401

bool interface_is_up(const char *interface){

1268

1402

struct ifreq ifr;

1269

1403

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

1280

1414

/*

1281

1415

* This function determines if a network interface is running

1282

1416

*/

1417

__attribute__((nonnull, warn_unused_result))

1283

1418

bool interface_is_running(const char *interface){

1284

1419

struct ifreq ifr;

1285

1420

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

1293

1428

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

1294

1429

}

1295

1430

1431

__attribute__((nonnull, pure, warn_unused_result))

1296

1432

int notdotentries(const struct dirent *direntry){

1297

1433

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

1298

1434

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

1305

1441

}

1306

1442

1307

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1308

1445

int runnable_hook(const struct dirent *direntry){

1309

1446

int ret;

1310

1447

size_t sret;

1318

1455

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

1319

1456

"abcdefghijklmnopqrstuvwxyz"

1320

1457

"0123456789"

1321

"_-");

1458

"_.-");

1322

1459

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

1323

1460

/* Contains non-allowed characters */

1324

1461

if(debug){

1328

1465

return 0;

1329

1466

}

1330

1467

1331

char *fullname = NULL;

1332

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

1333

if(ret < 0){

1334

perror_plus("asprintf");

1335

return 0;

1336

}

1337

1338

ret = stat(fullname, &st);

1468

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

1339

1469

if(ret == -1){

1340

1470

if(debug){

1341

1471

perror_plus("Could not stat hook");

1365

1495

return 1;

1366

1496

}

1367

1497

1498

__attribute__((nonnull, warn_unused_result))

1368

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1369

1500

mandos_context *mc){

1370

1501

int ret;

1374

1505

1375

1506

while(true){

1376

1507

if(mc->current_server == NULL){

1377

if (debug){

1508

if(debug){

1378

1509

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

1379

1510

" No timeout!\n");

1380

1511

}

1381

1512

ret = avahi_simple_poll_iterate(s, -1);

1382

1513

} else {

1383

if (debug){

1514

if(debug){

1384

1515

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

1385

1516

" it, or wait\n");

1386

1517

}

1403

1534

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

1404

1535

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

1405

1536

1406

if (debug){

1537

if(debug){

1407

1538

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

1408

1539

block_time);

1409

1540

}

1431

1562

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

1432

1563

}

1433

1564

if(ret != 0){

1434

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

1565

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

1435

1566

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

1436

1567

}

1437

1568

}

1439

1570

}

1440

1571

1441

1572

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

1573

__attribute__((warn_unused_result))

1442

1574

error_t raise_privileges(void){

1443

1575

error_t old_errno = errno;

1444

1576

error_t ret_errno = 0;

1445

1577

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

1446

1578

ret_errno = errno;

1447

perror_plus("seteuid");

1448

1579

}

1449

1580

errno = old_errno;

1450

1581

return ret_errno;

1451

1582

}

1452

1583

1453

1584

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

1585

__attribute__((warn_unused_result))

1454

1586

error_t raise_privileges_permanently(void){

1455

1587

error_t old_errno = errno;

1456

1588

error_t ret_errno = raise_privileges();

1460

1592

}

1461

1593

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

1462

1594

ret_errno = errno;

1463

perror_plus("seteuid");

1464

1595

}

1465

1596

errno = old_errno;

1466

1597

return ret_errno;

1467

1598

}

1468

1599

1469

1600

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

1601

__attribute__((warn_unused_result))

1470

1602

error_t lower_privileges(void){

1471

1603

error_t old_errno = errno;

1472

1604

error_t ret_errno = 0;

1473

1605

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

1474

1606

ret_errno = errno;

1475

perror_plus("seteuid");

1476

1607

}

1477

1608

errno = old_errno;

1478

1609

return ret_errno;

1479

1610

}

1480

1611

1481

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1482

1614

error_t lower_privileges_permanently(void){

1483

1615

error_t old_errno = errno;

1484

1616

error_t ret_errno = 0;

1485

1617

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

1486

1618

ret_errno = errno;

1487

perror_plus("setuid");

1488

1619

}

1489

1620

errno = old_errno;

1490

1621

return ret_errno;

1491

1622

}

1492

1623

1493

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

1624

__attribute__((nonnull))

1625

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

1494

1626

const float delay){

1495

struct dirent **direntries;

1496

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

1497

alphasort);

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1498

1654

if(numhooks == -1){

1499

if(errno == ENOENT){

1500

if(debug){

1501

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

1502

" found\n", hookdir);

1503

}

1504

} else {

1505

perror_plus("scandir");

1655

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1506

1666

}

1507

} else {

1508

struct dirent *direntry;

1509

int ret;

1510

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

1511

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

1512

direntry = direntries[i];

1513

char *fullname = NULL;

1514

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

1515

if(ret < 0){

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1516

1728

perror_plus("asprintf");

1517

continue;

1518

}

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

pid_t hook_pid = fork();

1524

if(hook_pid == 0){

1525

/* Child */

1526

/* Raise privileges */

1527

raise_privileges_permanently();

1528

/* Set group */

1529

errno = 0;

1530

ret = setgid(0);

1531

if(ret == -1){

1532

perror_plus("setgid");

1533

}

1534

/* Reset supplementary groups */

1535

errno = 0;

1536

ret = setgroups(0, NULL);

1537

if(ret == -1){

1538

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

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

1559

if(ret == -1){

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

char *delaystring;

1564

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

1565

if(ret == -1){

1566

perror_plus("asprintf");

1567

_exit(EX_OSERR);

1568

}

1569

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

1570

if(ret == -1){

1571

free(delaystring);

1572

perror_plus("setenv");

1573

_exit(EX_OSERR);

1574

}

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1575

1733

free(delaystring);

1576

if(connect_to != NULL){

1577

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

1578

if(ret == -1){

1579

perror_plus("setenv");

1580

_exit(EX_OSERR);

1581

}

1582

}

1583

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

1584

perror_plus("execl");

1585

_exit(EXIT_FAILURE);

1586

}

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

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

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1587

1785

} else {

1588

int status;

1589

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

1590

perror_plus("waitpid");

1591

free(fullname);

1592

continue;

1593

}

1594

if(WIFEXITED(status)){

1595

if(WEXITSTATUS(status) != 0){

1596

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

1597

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

1598

WEXITSTATUS(status));

1599

free(fullname);

1600

continue;

1601

}

1602

} else if(WIFSIGNALED(status)){

1603

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

1604

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

1605

WTERMSIG(status));

1606

free(fullname);

1607

continue;

1608

} else {

1609

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

1610

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

1611

free(fullname);

1612

continue;

1613

}

1614

}

1615

free(fullname);

1616

if(debug){

1617

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

1618

direntry->d_name);

1619

}

1620

}

1621

close(devnull);

1622

}

1623

return true;

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1624

1805

}

1625

1806

1807

__attribute__((nonnull, warn_unused_result))

1626

1808

error_t bring_up_interface(const char *const interface,

1627

1809

const float delay){

1628

int sd = -1;

1629

1810

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

1811

int ret;

1632

1812

struct ifreq network;

1633

1813

unsigned int if_index = if_nametoindex(interface);

1634

1814

if(if_index == 0){

1643

1823

}

1644

1824

1645

1825

if(not interface_is_up(interface)){

1646

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

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1647

1828

ret_errno = errno;

1648

1829

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

1649

1830

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

1831

errno = old_errno;

1650

1832

return ret_errno;

1651

1833

}

1652

network.ifr_flags |= IFF_UP;

1834

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

1653

1835

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

1836

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

1837

if(sd == -1){

1656

1838

ret_errno = errno;

1657

1839

perror_plus("socket");

1658

1840

errno = old_errno;

1659

1841

return ret_errno;

1660

1842

}

1661

1843

1662

1844

if(quit_now){

1663

close(sd);

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1664

1849

errno = old_errno;

1665

1850

return EINTR;

1666

1851

}

1670

1855

interface);

1671

1856

}

1672

1857

1673

/* Raise priviliges */

1674

raise_privileges();

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1675

1864

1676

1865

#ifdef __linux__

1677

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1678

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

1679

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

1680

bool restore_loglevel = true;

1681

if(ret_linux == -1){

1682

restore_loglevel = false;

1683

perror_plus("klogctl");

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1684

1877

}

1685

1878

#endif /* __linux__ */

1686

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

1687

ret_errno = errno;

1879

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

1880

ioctl_errno = errno;

1688

1881

#ifdef __linux__

1689

1882

if(restore_loglevel){

1690

1883

ret_linux = klogctl(7, NULL, 0);

1694

1887

}

1695

1888

#endif /* __linux__ */

1696

1889

1697

/* Lower privileges */

1698

lower_privileges();

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1699

1899

1700

1900

/* Close the socket */

1701

1901

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

1704

1904

}

1705

1905

1706

1906

if(ret_setflags == -1){

1707

errno = ret_errno;

1907

errno = ioctl_errno;

1708

1908

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1709

1909

errno = old_errno;

1710

return ret_errno;

1910

return ioctl_errno;

1711

1911

}

1712

1912

} else if(debug){

1713

1913

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

1731

1931

return 0;

1732

1932

}

1733

1933

1934

__attribute__((nonnull, warn_unused_result))

1734

1935

error_t take_down_interface(const char *const interface){

1735

1936

error_t old_errno = errno;

1736

1937

struct ifreq network;

1741

1942

return ENXIO;

1742

1943

}

1743

1944

if(interface_is_up(interface)){

1744

error_t ret_errno = 0;

1945

error_t ret_errno = 0, ioctl_errno = 0;

1745

1946

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

1746

1947

ret_errno = errno;

1747

1948

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

1748

1949

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

1950

errno = old_errno;

1749

1951

return ret_errno;

1750

1952

}

1751

1953

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

1752

1954

1753

1955

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

1754

if(sd < 0){

1956

if(sd == -1){

1755

1957

ret_errno = errno;

1756

1958

perror_plus("socket");

1757

1959

errno = old_errno;

1763

1965

interface);

1764

1966

}

1765

1967

1766

/* Raise priviliges */

1767

raise_privileges();

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1768

1974

1769

1975

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

1770

ret_errno = errno;

1976

ioctl_errno = errno;

1771

1977

1772

/* Lower privileges */

1773

lower_privileges();

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1774

1987

1775

1988

/* Close the socket */

1776

1989

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

1779

1992

}

1780

1993

1781

1994

if(ret_setflags == -1){

1782

errno = ret_errno;

1995

errno = ioctl_errno;

1783

1996

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1784

1997

errno = old_errno;

1785

return ret_errno;

1998

return ioctl_errno;

1786

1999

}

1787

2000

} else if(debug){

1788

2001

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

1794

2007

}

1795

2008

1796

2009

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

1797

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

2010

mandos_context mc = { .server = NULL, .dh_bits = 0,

1798

2011

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

1799

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

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1800

2013

.interfaces = NULL, .interfaces_size = 0 };

1801

2014

AvahiSServiceBrowser *sb = NULL;

1802

2015

error_t ret_errno;

1806

2019

int exitcode = EXIT_SUCCESS;

1807

2020

char *interfaces_to_take_down = NULL;

1808

2021

size_t interfaces_to_take_down_size = 0;

1809

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

1810

bool tempdir_created = false;

2022

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

2023

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

2024

char *tempdir = NULL;

1811

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1812

2026

const char *seckey = PATHDIR "/" SECKEY;

1813

2027

const char *pubkey = PATHDIR "/" PUBKEY;

1995

2209

/* Work around Debian bug #633582:

1996

2210

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

1997

2211

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

2000

2218

struct stat st;

2001

2219

2002

2220

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

2042

2260

}

2043

2261

2044

2262

/* Lower privileges */

2045

lower_privileges();

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2046

2268

}

2047

2269

}

2048

2270

2074

2296

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

2075

2297

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

2076

2298

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2081

2301

}

2082

2302

2083

2303

if(not debug){

2161

2381

2162

2382

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

2163

2383

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2384

struct dirent **direntries = NULL;

2165

2385

/* Look for any good interfaces */

2166

2386

ret = scandir(sys_class_net, &direntries, good_interface,

2167

2387

alphasort);

2173

2393

if(ret_errno != 0){

2174

2394

errno = ret_errno;

2175

2395

perror_plus("argz_add");

2396

free(direntries[i]);

2176

2397

continue;

2177

2398

}

2178

2399

if(debug){

2179

2400

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2180

2401

direntries[i]->d_name);

2181

2402

}

2403

free(direntries[i]);

2182

2404

}

2183

2405

free(direntries);

2184

2406

} else {

2185

free(direntries);

2407

if(ret == 0){

2408

free(direntries);

2409

}

2186

2410

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

2187

2411

exitcode = EXIT_FAILURE;

2188

2412

goto end;

2211

2435

break;

2212

2436

}

2213

2437

bool interface_was_up = interface_is_up(interface);

2214

ret = bring_up_interface(interface, delay);

2438

errno = bring_up_interface(interface, delay);

2215

2439

if(not interface_was_up){

2216

if(ret != 0){

2217

errno = ret;

2440

if(errno != 0){

2218

2441

perror_plus("Failed to bring up interface");

2219

2442

} else {

2220

ret_errno = argz_add(&interfaces_to_take_down,

2221

&interfaces_to_take_down_size,

2222

interface);

2223

if(ret_errno != 0){

2224

errno = ret_errno;

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2225

2447

perror_plus("argz_add");

2226

2448

}

2227

2449

}

2258

2480

goto end;

2259

2481

}

2260

2482

2261

if(mkdtemp(tempdir) == NULL){

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2262

2493

perror_plus("mkdtemp");

2263

2494

goto end;

2264

2495

}

2265

tempdir_created = true;

2266

2496

2267

2497

if(quit_now){

2268

2498

goto end;

2343

2573

sleep((unsigned int)retry_interval);

2344

2574

}

2345

2575

2346

if (not quit_now){

2576

if(not quit_now){

2347

2577

exitcode = EXIT_SUCCESS;

2348

2578

}

2349

2579

2404

2634

if(debug){

2405

2635

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

2406

2636

}

2407

2637

2408

2638

ret = avahi_loop_with_timeout(simple_poll,

2409

2639

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

2410

2640

if(debug){

2446

2676

mc.current_server->prev->next = NULL;

2447

2677

while(mc.current_server != NULL){

2448

2678

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

free((char *)(mc.current_server->ip));

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2449

2687

free(mc.current_server);

2450

2688

mc.current_server = next;

2451

2689

}

2452

2690

}

2453

2691

2454

/* Re-raise priviliges */

2692

/* Re-raise privileges */

2455

2693

{

2456

raise_privileges();

2457

2458

/* Run network hooks */

2459

run_network_hooks("stop", interfaces_hooks != NULL ?

2460

interfaces_hooks : "", delay);

2461

2462

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

2463

{

2464

char *interface = NULL;

2465

while((interface=argz_next(interfaces_to_take_down,

2466

interfaces_to_take_down_size,

2467

interface))){

2468

ret_errno = take_down_interface(interface);

2469

if(ret_errno != 0){

2470

errno = ret_errno;

2471

perror_plus("Failed to take down interface");

2472

}

2473

}

2474

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

2475

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

2476

" down\n");

2477

}

2478

}

2479

2480

lower_privileges_permanently();

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2481

2728

}

2482

2729

2483

2730

free(interfaces_to_take_down);

2484

2731

free(interfaces_hooks);

2485

2732

2486

2733

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

2487

if(tempdir_created){

2734

if(tempdir != NULL){

2488

2735

struct dirent **direntries = NULL;

2489

struct dirent *direntry = NULL;

2490

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

2491

alphasort);

2492

if (numentries > 0){

2493

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

2494

direntry = direntries[i];

2495

char *fullname = NULL;

2496

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

2497

direntry->d_name);

2498

if(ret < 0){

2499

perror_plus("asprintf");

2500

continue;

2501

}

2502

ret = remove(fullname);

2503

if(ret == -1){

2504

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

2505

strerror(errno));

2506

}

2507

free(fullname);

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2508

2773

}

2509

}

2510

2511

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

2512

free(direntries);

2513

if (numentries == -1){

2514

perror_plus("scandir");

2515

}

2516

ret = rmdir(tempdir);

2517

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

2518

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2519

2775

}

2520

2776

}

2521

2777