/mandos/trunk : revision 723.1.5

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

161

166

const char *priority;

162

167

gpgme_ctx_t ctx;

163

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

164

171

} mandos_context;

165

172

166

173

/* global so signal handler can reach it*/

178

185

perror(print_text);

179

186

}

180

187

181

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

188

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

182

189

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

183

190

va_list ap;

184

191

va_start (ap, format);

185

192

186

193

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

187

194

program_invocation_short_name));

188

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

195

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

189

196

}

190

197

191

198

/*

193

200

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

194

201

* "buffer_length" is how much is already used.

195

202

*/

203

__attribute__((nonnull, warn_unused_result))

196

204

size_t incbuffer(char **buffer, size_t buffer_length,

197

205

size_t buffer_capacity){

198

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

199

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

200

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;

201

213

return 0;

202

214

}

215

*buffer = new_buf;

203

216

buffer_capacity += BUFFER_SIZE;

204

217

}

205

218

return buffer_capacity;

206

219

}

207

220

208

221

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

222

__attribute__((nonnull, warn_unused_result))

209

223

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

210

224

int af, server **current_server){

211

225

int ret;

220

234

.af = af };

221

235

if(new_server->ip == NULL){

222

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);

223

252

return false;

224

253

}

225

254

/* Special case of first server */

227

256

new_server->next = new_server;

228

257

new_server->prev = new_server;

229

258

*current_server = new_server;

230

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

231

259

} else {

260

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

232

261

new_server->next = *current_server;

233

262

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

234

263

new_server->prev->next = new_server;

235

264

(*current_server)->prev = new_server;

236

265

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

266

return true;

243

267

}

244

268

245

269

/*

246

270

* Initialize GPGME.

247

271

*/

248

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

249

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){

250

277

gpgme_error_t rc;

251

278

gpgme_engine_info_t engine_info;

252

279

253

280

/*

254

281

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

255

282

*/

256

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

257

284

int ret;

258

285

int fd;

259

286

gpgme_data_t pgp_data;

340

367

* Decrypt OpenPGP data.

341

368

* Returns -1 on error

342

369

*/

370

__attribute__((nonnull, warn_unused_result))

343

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

372

size_t crypto_size,

345

373

char **plaintext,

465

493

return plaintext_length;

466

494

}

467

495

468

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

469

498

const char *ret = gnutls_strerror(value);

470

499

if(ret == NULL)

471

500

ret = "(unknown)";

473

502

}

474

503

475

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

476

506

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

477

507

const char* string){

478

508

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

479

509

}

480

510

511

__attribute__((nonnull, warn_unused_result))

481

512

static int init_gnutls_global(const char *pubkeyfilename,

482

513

const char *seckeyfilename,

483

514

mandos_context *mc){

557

588

return -1;

558

589

}

559

590

591

__attribute__((nonnull, warn_unused_result))

560

592

static int init_gnutls_session(gnutls_session_t *session,

561

593

mandos_context *mc){

562

594

int ret;

619

651

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

620

652

621

653

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

622

655

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

623

656

AvahiIfIndex if_index,

624

657

int af, mandos_context *mc){

625

658

int ret, tcp_sd = -1;

626

659

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

660

struct sockaddr_storage to;

631

661

char *buffer = NULL;

632

662

char *decrypted_buffer = NULL;

633

663

size_t buffer_length = 0;

657

687

return -1;

658

688

}

659

689

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

660

722

ret = init_gnutls_session(&session, mc);

661

723

if(ret != 0){

662

724

return -1;

682

744

683

745

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

684

746

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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

747

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

748

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

687

749

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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

750

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

751

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

690

752

}

691

753

if(ret < 0 ){

692

754

int e = errno;

701

763

goto mandos_end;

702

764

}

703

765

if(af == AF_INET6){

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

708

769

if(if_index == AVAHI_IF_UNSPEC){

709

770

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

710

771

" incomplete without a network interface\n");

712

773

goto mandos_end;

713

774

}

714

775

/* Set the network interface number as scope */

715

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

716

777

}

717

778

} else {

718

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

719

-Wconversion and

720

-Wunreachable-code */

779

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

721

780

}

722

781

723

782

if(quit_now){

740

799

}

741

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

742

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

744

802

if(af == AF_INET6){

745

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

746

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

747

807

} else {

748

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

749

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

750

812

}

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

757

819

}

758

820

}

759

821

763

825

}

764

826

765

827

if(af == AF_INET6){

766

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

828

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

829

sizeof(struct sockaddr_in6));

767

830

} else {

768

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

831

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

832

sizeof(struct sockaddr_in));

769

833

}

770

834

if(ret < 0){

771

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

835

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

772

836

int e = errno;

773

837

perror_plus("connect");

774

838

errno = e;

989

1053

return retval;

990

1054

}

991

1055

1056

__attribute__((nonnull))

992

1057

static void resolve_callback(AvahiSServiceResolver *r,

993

1058

AvahiIfIndex interface,

994

1059

AvahiProtocol proto,

1002

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1003

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1004

1069

flags,

1005

void* mc){

1070

void *mc){

1006

1071

if(r == NULL){

1007

1072

return;

1008

1073

}

1011

1076

timed out */

1012

1077

1013

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1014

1080

return;

1015

1081

}

1016

1082

1061

1127

const char *domain,

1062

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1063

1129

flags,

1064

void* mc){

1130

void *mc){

1065

1131

if(b == NULL){

1066

1132

return;

1067

1133

}

1127

1193

errno = old_errno;

1128

1194

}

1129

1195

1196

__attribute__((nonnull, warn_unused_result))

1130

1197

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

1131

1198

int ret;

1132

1199

error_t ret_errno;

1151

1218

return true;

1152

1219

}

1153

1220

1221

__attribute__((nonnull, warn_unused_result))

1154

1222

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

1155

1223

1156

1224

/* Reject the loopback device */

1198

1266

* corresponds to an acceptable network device.

1199

1267

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

1200

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1201

1270

int good_interface(const struct dirent *if_entry){

1202

1271

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

1203

1272

return 0;

1221

1290

/*

1222

1291

* This function determines if a network interface is up.

1223

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1224

1294

bool interface_is_up(const char *interface){

1225

1295

struct ifreq ifr;

1226

1296

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

1237

1307

/*

1238

1308

* This function determines if a network interface is running

1239

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1240

1311

bool interface_is_running(const char *interface){

1241

1312

struct ifreq ifr;

1242

1313

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

1250

1321

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

1251

1322

}

1252

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1253

1325

int notdotentries(const struct dirent *direntry){

1254

1326

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

1255

1327

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

1262

1334

}

1263

1335

1264

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1265

1338

int runnable_hook(const struct dirent *direntry){

1266

1339

int ret;

1267

1340

size_t sret;

1275

1348

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

1276

1349

"abcdefghijklmnopqrstuvwxyz"

1277

1350

"0123456789"

1278

"_-");

1351

"_.-");

1279

1352

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

1280

1353

/* Contains non-allowed characters */

1281

1354

if(debug){

1285

1358

return 0;

1286

1359

}

1287

1360

1288

char *fullname = NULL;

1289

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

1290

if(ret < 0){

1291

perror_plus("asprintf");

1292

return 0;

1293

}

1294

1295

ret = stat(fullname, &st);

1361

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

1296

1362

if(ret == -1){

1297

1363

if(debug){

1298

1364

perror_plus("Could not stat hook");

1322

1388

return 1;

1323

1389

}

1324

1390

1391

__attribute__((nonnull, warn_unused_result))

1325

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1326

1393

mandos_context *mc){

1327

1394

int ret;

1331

1398

1332

1399

while(true){

1333

1400

if(mc->current_server == NULL){

1334

if (debug){

1401

if(debug){

1335

1402

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

1336

1403

" No timeout!\n");

1337

1404

}

1338

1405

ret = avahi_simple_poll_iterate(s, -1);

1339

1406

} else {

1340

if (debug){

1407

if(debug){

1341

1408

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

1342

1409

" it, or wait\n");

1343

1410

}

1360

1427

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

1361

1428

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

1362

1429

1363

if (debug){

1430

if(debug){

1364

1431

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

1365

1432

block_time);

1366

1433

}

1388

1455

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

1389

1456

}

1390

1457

if(ret != 0){

1391

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

1458

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

1392

1459

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

1393

1460

}

1394

1461

}

1396

1463

}

1397

1464

1398

1465

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

1466

__attribute__((warn_unused_result))

1399

1467

error_t raise_privileges(void){

1400

1468

error_t old_errno = errno;

1401

1469

error_t ret_errno = 0;

1402

1470

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

1403

1471

ret_errno = errno;

1404

perror_plus("seteuid");

1405

1472

}

1406

1473

errno = old_errno;

1407

1474

return ret_errno;

1408

1475

}

1409

1476

1410

1477

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

1478

__attribute__((warn_unused_result))

1411

1479

error_t raise_privileges_permanently(void){

1412

1480

error_t old_errno = errno;

1413

1481

error_t ret_errno = raise_privileges();

1417

1485

}

1418

1486

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

1419

1487

ret_errno = errno;

1420

perror_plus("seteuid");

1421

1488

}

1422

1489

errno = old_errno;

1423

1490

return ret_errno;

1424

1491

}

1425

1492

1426

1493

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

1494

__attribute__((warn_unused_result))

1427

1495

error_t lower_privileges(void){

1428

1496

error_t old_errno = errno;

1429

1497

error_t ret_errno = 0;

1430

1498

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

1431

1499

ret_errno = errno;

1432

perror_plus("seteuid");

1433

1500

}

1434

1501

errno = old_errno;

1435

1502

return ret_errno;

1436

1503

}

1437

1504

1438

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1439

1507

error_t lower_privileges_permanently(void){

1440

1508

error_t old_errno = errno;

1441

1509

error_t ret_errno = 0;

1442

1510

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

1443

1511

ret_errno = errno;

1444

perror_plus("setuid");

1445

1512

}

1446

1513

errno = old_errno;

1447

1514

return ret_errno;

1448

1515

}

1449

1516

1450

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

1517

__attribute__((nonnull))

1518

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

1451

1519

const float delay){

1452

struct dirent **direntries;

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1453

1551

struct dirent *direntry;

1454

1552

int ret;

1455

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

1456

alphasort);

1457

if(numhooks == -1){

1458

if(errno == ENOENT){

1459

if(debug){

1460

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

1461

" found\n", hookdir);

1462

}

1463

} else {

1464

perror_plus("scandir");

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1465

1559

}

1466

} else {

1467

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

1468

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

1469

direntry = direntries[i];

1470

char *fullname = NULL;

1471

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

1472

if(ret < 0){

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1473

1621

perror_plus("asprintf");

1474

continue;

1475

}

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

pid_t hook_pid = fork();

1481

if(hook_pid == 0){

1482

/* Child */

1483

/* Raise privileges */

1484

raise_privileges_permanently();

1485

/* Set group */

1486

errno = 0;

1487

ret = setgid(0);

1488

if(ret == -1){

1489

perror_plus("setgid");

1490

}

1491

/* Reset supplementary groups */

1492

errno = 0;

1493

ret = setgroups(0, NULL);

1494

if(ret == -1){

1495

perror_plus("setgroups");

1496

}

1497

dup2(devnull, STDIN_FILENO);

1498

close(devnull);

1499

dup2(STDERR_FILENO, STDOUT_FILENO);

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

char *delaystring;

1521

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

1522

if(ret == -1){

1523

perror_plus("asprintf");

1524

_exit(EX_OSERR);

1525

}

1526

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

1527

if(ret == -1){

1528

free(delaystring);

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1532

1626

free(delaystring);

1533

if(connect_to != NULL){

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

}

1540

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

1541

perror_plus("execl");

1542

_exit(EXIT_FAILURE);

1543

}

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1544

1673

} else {

1545

int status;

1546

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

1547

perror_plus("waitpid");

1548

free(fullname);

1549

continue;

1550

}

1551

if(WIFEXITED(status)){

1552

if(WEXITSTATUS(status) != 0){

1553

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

1554

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

1555

WEXITSTATUS(status));

1556

free(fullname);

1557

continue;

1558

}

1559

} else if(WIFSIGNALED(status)){

1560

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

1561

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

1562

WTERMSIG(status));

1563

free(fullname);

1564

continue;

1565

} else {

1566

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

1567

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

1568

free(fullname);

1569

continue;

1570

}

1571

}

1572

free(fullname);

1573

if(debug){

1574

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

1575

direntry->d_name);

1576

}

1577

}

1578

close(devnull);

1579

}

1580

return true;

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1581

1693

}

1582

1694

1695

__attribute__((nonnull, warn_unused_result))

1583

1696

error_t bring_up_interface(const char *const interface,

1584

1697

const float delay){

1585

int sd = -1;

1586

1698

error_t old_errno = errno;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1699

int ret;

1589

1700

struct ifreq network;

1590

1701

unsigned int if_index = if_nametoindex(interface);

1591

1702

if(if_index == 0){

1600

1711

}

1601

1712

1602

1713

if(not interface_is_up(interface)){

1603

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

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1604

1716

ret_errno = errno;

1605

1717

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

1606

1718

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

1719

errno = old_errno;

1607

1720

return ret_errno;

1608

1721

}

1609

network.ifr_flags |= IFF_UP;

1722

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

1610

1723

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1724

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

1725

if(sd == -1){

1613

1726

ret_errno = errno;

1614

1727

perror_plus("socket");

1615

1728

errno = old_errno;

1616

1729

return ret_errno;

1617

1730

}

1618

1731

1619

1732

if(quit_now){

1620

close(sd);

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1621

1737

errno = old_errno;

1622

1738

return EINTR;

1623

1739

}

1627

1743

interface);

1628

1744

}

1629

1745

1630

/* Raise priviliges */

1631

raise_privileges();

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1632

1752

1633

1753

#ifdef __linux__

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1641

1765

}

1642

1766

#endif /* __linux__ */

1643

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

1644

ret_errno = errno;

1767

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

1768

ioctl_errno = errno;

1645

1769

#ifdef __linux__

1646

1770

if(restore_loglevel){

1647

1771

ret_linux = klogctl(7, NULL, 0);

1651

1775

}

1652

1776

#endif /* __linux__ */

1653

1777

1654

/* Lower privileges */

1655

lower_privileges();

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1656

1787

1657

1788

/* Close the socket */

1658

1789

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

1661

1792

}

1662

1793

1663

1794

if(ret_setflags == -1){

1664

errno = ret_errno;

1795

errno = ioctl_errno;

1665

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1666

1797

errno = old_errno;

1667

return ret_errno;

1798

return ioctl_errno;

1668

1799

}

1669

1800

} else if(debug){

1670

1801

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

1688

1819

return 0;

1689

1820

}

1690

1821

1822

__attribute__((nonnull, warn_unused_result))

1691

1823

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1693

1824

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1696

1825

struct ifreq network;

1697

1826

unsigned int if_index = if_nametoindex(interface);

1698

1827

if(if_index == 0){

1701

1830

return ENXIO;

1702

1831

}

1703

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1704

1834

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

1705

1835

ret_errno = errno;

1706

1836

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

1707

1837

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

1838

errno = old_errno;

1708

1839

return ret_errno;

1709

1840

}

1710

1841

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

1711

1842

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1843

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

1844

if(sd == -1){

1714

1845

ret_errno = errno;

1715

1846

perror_plus("socket");

1716

1847

errno = old_errno;

1722

1853

interface);

1723

1854

}

1724

1855

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1733

1875

1734

1876

/* Close the socket */

1735

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

1877

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

1736

1878

if(ret == -1){

1737

1879

perror_plus("close");

1738

1880

}

1739

1881

1740

1882

if(ret_setflags == -1){

1741

errno = ret_errno;

1883

errno = ioctl_errno;

1742

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1743

1885

errno = old_errno;

1744

return ret_errno;

1886

return ioctl_errno;

1745

1887

}

1746

1888

} else if(debug){

1747

1889

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

1755

1897

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

1756

1898

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

1757

1899

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

1758

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1759

1902

AvahiSServiceBrowser *sb = NULL;

1760

1903

error_t ret_errno;

1761

1904

int ret;

1762

1905

intmax_t tmpmax;

1763

1906

char *tmp;

1764

1907

int exitcode = EXIT_SUCCESS;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

1767

1908

char *interfaces_to_take_down = NULL;

1768

1909

size_t interfaces_to_take_down_size = 0;

1769

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

1770

bool tempdir_created = false;

1910

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

1911

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

1912

char *tempdir = NULL;

1771

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1772

1914

const char *seckey = PATHDIR "/" SECKEY;

1773

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1774

1916

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

1776

1917

1777

1918

bool gnutls_initialized = false;

1778

1919

bool gpgme_initialized = false;

1869

2010

connect_to = arg;

1870

2011

break;

1871

2012

case 'i': /* --interface */

1872

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1873

(int)',');

2013

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

2014

arg, (int)',');

1874

2015

if(ret_errno != 0){

1875

2016

argp_error(state, "%s", strerror(ret_errno));

1876

2017

}

1956

2097

/* Work around Debian bug #633582:

1957

2098

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

1958

2099

1959

/* Re-raise priviliges */

1960

if(raise_privileges() == 0){

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

1961

2106

struct stat st;

1962

2107

1963

2108

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

2003

2148

}

2004

2149

2005

2150

/* Lower privileges */

2006

errno = 0;

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2010

2155

}

2011

2156

}

2012

2157

}

2013

2158

2014

/* Remove empty interface names */

2159

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

2015

2160

{

2016

2161

char *interface = NULL;

2017

while((interface = argz_next(interfaces, interfaces_size,

2162

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

2018

2163

interface))){

2019

if(if_nametoindex(interface) == 0){

2020

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

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2021

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2022

2168

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

2023

2169

}

2024

argz_delete(&interfaces, &interfaces_size, interface);

2170

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2025

2171

interface = NULL;

2026

2172

}

2027

2173

}

2029

2175

2030

2176

/* Run network hooks */

2031

2177

{

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2035

2180

if(interfaces_hooks == NULL){

2036

2181

perror_plus("malloc");

2037

2182

goto end;

2038

2183

}

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

2184

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2048

2189

}

2049

2190

2050

2191

if(not debug){

2127

2268

}

2128

2269

2129

2270

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

2130

if(interfaces == NULL){

2131

struct dirent **direntries;

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2132

2273

/* Look for any good interfaces */

2133

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2134

2275

alphasort);

2135

2276

if(ret >= 1){

2136

2277

/* Add all found interfaces to interfaces list */

2137

2278

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2279

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

2139

2280

direntries[i]->d_name);

2140

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2141

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2142

2285

continue;

2143

2286

}

2144

2287

if(debug){

2145

2288

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

2146

2289

direntries[i]->d_name);

2147

2290

}

2291

free(direntries[i]);

2148

2292

}

2149

2293

free(direntries);

2150

2294

} else {

2151

free(direntries);

2295

if(ret == 0){

2296

free(direntries);

2297

}

2152

2298

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

2153

2299

exitcode = EXIT_FAILURE;

2154

2300

goto end;

2155

2301

}

2156

2302

}

2157

2303

2158

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

2159

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

2160

if(debug){

2161

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

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

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

2169

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

2304

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

2305

{

2170

2306

char *interface = NULL;

2171

while((interface = argz_next(interfaces, interfaces_size,

2307

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

2172

2308

interface))){

2309

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

2310

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

2311

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

2312

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

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

}

2322

}

2323

break;

2324

}

2173

2325

bool interface_was_up = interface_is_up(interface);

2174

ret = bring_up_interface(interface, delay);

2326

errno = bring_up_interface(interface, delay);

2175

2327

if(not interface_was_up){

2176

if(ret != 0){

2177

errno = ret;

2328

if(errno != 0){

2178

2329

perror_plus("Failed to bring up interface");

2179

2330

} else {

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2183

2337

}

2184

2338

}

2185

2339

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2189

2340

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

2190

2341

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

2191

2342

}

2192

2343

}

2193

2344

2345

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

2346

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

2347

if(debug){

2348

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

2349

mc.interfaces);

2350

}

2351

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

2352

}

2353

2194

2354

if(quit_now){

2195

2355

goto end;

2196

2356

}

2208

2368

goto end;

2209

2369

}

2210

2370

2211

if(mkdtemp(tempdir) == NULL){

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2212

2381

perror_plus("mkdtemp");

2213

2382

goto end;

2214

2383

}

2215

tempdir_created = true;

2216

2384

2217

2385

if(quit_now){

2218

2386

goto end;

2254

2422

exitcode = EX_USAGE;

2255

2423

goto end;

2256

2424

}

2257

2425

2258

2426

if(quit_now){

2259

2427

goto end;

2260

2428

}

2290

2458

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

2291

2459

(int)retry_interval);

2292

2460

}

2293

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2294

2462

}

2295

2463

2296

if (not quit_now){

2464

if(not quit_now){

2297

2465

exitcode = EXIT_SUCCESS;

2298

2466

}

2299

2467

2354

2522

if(debug){

2355

2523

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

2356

2524

}

2357

2525

2358

2526

ret = avahi_loop_with_timeout(simple_poll,

2359

2527

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

2360

2528

if(debug){

2369

2537

}

2370

2538

2371

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

2372

2542

if(sb != NULL)

2373

2543

avahi_s_service_browser_free(sb);

2374

2544

2394

2564

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

2395

2565

while(mc.current_server != NULL){

2396

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2397

2575

free(mc.current_server);

2398

2576

mc.current_server = next;

2399

2577

}

2400

2578

}

2401

2579

2402

/* Re-raise priviliges */

2580

/* Re-raise privileges */

2403

2581

{

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2420

}

2421

}

2422

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

2423

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

2424

" down\n");

2425

}

2426

}

2427

2428

lower_privileges_permanently();

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

2429

2616

}

2430

2617

2431

2618

free(interfaces_to_take_down);

2432

2619

free(interfaces_hooks);

2433

2620

2434

2621

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

2435

if(tempdir_created){

2622

if(tempdir != NULL){

2436

2623

struct dirent **direntries = NULL;

2437

struct dirent *direntry = NULL;

2438

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

2439

alphasort);

2440

if (numentries > 0){

2441

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

2442

direntry = direntries[i];

2443

char *fullname = NULL;

2444

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

2445

direntry->d_name);

2446

if(ret < 0){

2447

perror_plus("asprintf");

2448

continue;

2449

}

2450

ret = remove(fullname);

2451

if(ret == -1){

2452

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

2453

strerror(errno));

2454

}

2455

free(fullname);

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2456

2661

}

2457

}

2458

2459

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

2460

free(direntries);

2461

if (numentries == -1){

2462

perror_plus("scandir");

2463

}

2464

ret = rmdir(tempdir);

2465

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

2466

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2467

2663

}

2468

2664

}

2469

2665