/mandos/trunk : revision 485

62

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

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno */

65

#include <errno.h> /* perror(), errno,

66

program_invocation_short_name */

66

67

#include <time.h> /* nanosleep(), time(), sleep() */

67

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

69

SIOCSIFFLAGS, if_indextoname(),

130

131

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

131

132

char *connect_to = NULL;

132

133

134

/* Doubly linked list that need to be circularly linked when used */

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

144

133

145

/* Used for passing in values through the Avahi callback functions */

134

146

typedef struct {

135

147

AvahiSimplePoll *simple_poll;

139

151

gnutls_dh_params_t dh_params;

140

152

const char *priority;

141

153

gpgme_ctx_t ctx;

154

server *current_server;

142

155

} mandos_context;

143

156

144

157

/* global context so signal handler can reach it*/

145

158

mandos_context mc = { .simple_poll = NULL, .server = NULL,

146

159

.dh_bits = 1024, .priority = "SECURE256"

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

160

":!CTYPE-X.509:+CTYPE-OPENPGP",

161

.current_server = NULL };

148

162

149

163

sig_atomic_t quit_now = 0;

150

164

int signal_received = 0;

151

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

fprintf(stderr, "Mandos plugin %s: ",

169

program_invocation_short_name);

170

perror(print_text);

171

}

172

152

173

/*

153

174

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

175

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

166

187

return buffer_capacity;

167

188

}

168

189

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

193

int ret;

194

server *new_server = malloc(sizeof(server));

195

if(new_server == NULL){

196

perror_plus("malloc");

197

return -1;

198

}

199

*new_server = (server){ .ip = strdup(ip),

200

.port = port,

201

.if_index = if_index,

202

.af = af };

203

if(new_server->ip == NULL){

204

perror_plus("strdup");

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

209

new_server->next = new_server;

210

new_server->prev = new_server;

211

mc.current_server = new_server;

212

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

213

} else {

214

new_server->next = mc.current_server;

215

new_server->prev = mc.current_server->prev;

216

new_server->prev->next = new_server;

217

mc.current_server->prev = new_server;

218

}

219

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

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

225

}

226

169

227

/*

170

228

* Initialize GPGME.

171

229

*/

185

243

186

244

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

187

245

if(fd == -1){

188

perror("open");

246

perror_plus("open");

189

247

return false;

190

248

}

191

249

205

263

206

264

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

207

265

if(ret == -1){

208

perror("close");

266

perror_plus("close");

209

267

}

210

268

gpgme_data_release(pgp_data);

211

269

return true;

336

394

337

395

/* Seek back to the beginning of the GPGME plaintext data buffer */

338

396

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

397

perror_plus("gpgme_data_seek");

340

398

plaintext_length = -1;

341

399

goto decrypt_end;

342

400

}

347

405

(size_t)plaintext_length,

348

406

plaintext_capacity);

349

407

if(plaintext_capacity == 0){

350

perror("incbuffer");

408

perror_plus("incbuffer");

351

409

plaintext_length = -1;

352

410

goto decrypt_end;

353

411

}

360

418

break;

361

419

}

362

420

if(ret < 0){

363

perror("gpgme_data_read");

421

perror_plus("gpgme_data_read");

364

422

plaintext_length = -1;

365

423

goto decrypt_end;

366

424

}

586

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

645

if(tcp_sd < 0){

588

646

int e = errno;

589

perror("socket");

647

perror_plus("socket");

590

648

errno = e;

591

649

goto mandos_end;

592

650

}

606

664

}

607

665

if(ret < 0 ){

608

666

int e = errno;

609

perror("inet_pton");

667

perror_plus("inet_pton");

610

668

errno = e;

611

669

goto mandos_end;

612

670

}

648

706

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

649

707

char interface[IF_NAMESIZE];

650

708

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

651

perror("if_indextoname");

709

perror_plus("if_indextoname");

652

710

} else {

653

711

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

654

712

ip, interface, port);

668

726

sizeof(addrstr));

669

727

}

670

728

if(pcret == NULL){

671

perror("inet_ntop");

729

perror_plus("inet_ntop");

672

730

} else {

673

731

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

674

732

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

689

747

if(ret < 0){

690

748

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

691

749

int e = errno;

692

perror("connect");

750

perror_plus("connect");

693

751

errno = e;

694

752

}

695

753

goto mandos_end;

708

766

out_size - written));

709

767

if(ret == -1){

710

768

int e = errno;

711

perror("write");

769

perror_plus("write");

712

770

errno = e;

713

771

goto mandos_end;

714

772

}

739

797

goto mandos_end;

740

798

}

741

799

800

/* Spurious warning from -Wint-to-pointer-cast */

742

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

802

744

803

if(quit_now){

781

840

buffer_capacity);

782

841

if(buffer_capacity == 0){

783

842

int e = errno;

784

perror("incbuffer");

843

perror_plus("incbuffer");

785

844

errno = e;

786

845

goto mandos_end;

787

846

}

892

951

if(e == 0){

893

952

e = errno;

894

953

}

895

perror("close");

954

perror_plus("close");

896

955

}

897

956

gnutls_deinit(session);

957

errno = e;

898

958

if(quit_now){

899

e = EINTR;

959

errno = EINTR;

900

960

retval = -1;

901

961

}

902

errno = e;

903

962

}

904

963

return retval;

905

964

}

948

1007

avahi_proto_to_af(proto));

949

1008

if(ret == 0){

950

1009

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

951

1013

}

952

1014

}

953

1015

}

1007

1069

}

1008

1070

}

1009

1071

1010

/* stop main loop after sigterm has been called */

1072

/* Signal handler that stops main loop after SIGTERM */

1011

1073

static void handle_sigterm(int sig){

1012

1074

if(quit_now){

1013

1075

return;

1015

1077

quit_now = 1;

1016

1078

signal_received = sig;

1017

1079

int old_errno = errno;

1080

/* set main loop to exit */

1018

1081

if(mc.simple_poll != NULL){

1019

1082

avahi_simple_poll_quit(mc.simple_poll);

1020

1083

}

1035

1098

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

1099

if_entry->d_name);

1037

1100

if(ret < 0){

1038

perror("asprintf");

1101

perror_plus("asprintf");

1039

1102

return 0;

1040

1103

}

1041

1104

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1042

1105

if(flags_fd == -1){

1043

perror("open");

1106

perror_plus("open");

1044

1107

free(flagname);

1045

1108

return 0;

1046

1109

}

1051

1114

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1052

1115

flagstring[(size_t)to_read] = '\0';

1053

1116

if(flagstring == NULL){

1054

perror("malloc");

1117

perror_plus("malloc");

1055

1118

close(flags_fd);

1056

1119

return 0;

1057

1120

}

1059

1122

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1060

1123

(size_t)to_read));

1061

1124

if(ssret == -1){

1062

perror("read");

1125

perror_plus("read");

1063

1126

free(flagstring);

1064

1127

close(flags_fd);

1065

1128

return 0;

1126

1189

return 1;

1127

1190

}

1128

1191

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

and (direntry->d_name[1] == '\0'

1196

or (direntry->d_name[1] == '.'

1197

and direntry->d_name[2] == '\0'))){

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1214

}

1215

ret = avahi_simple_poll_iterate(s, -1);

1216

} else {

1217

if (debug){

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1220

}

1221

/* the current time */

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1223

if(ret == -1){

1224

perror_plus("clock_gettime");

1225

return -1;

1226

}

1227

/* Calculating in ms how long time between now and server

1228

who we visted longest time ago. Now - last seen. */

1229

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1231

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1233

/* total time is 10s/10,000ms.

1234

Converting to s from ms by dividing by 1,000,

1235

and ns to ms by dividing by 1,000,000. */

1236

block_time = ((retry_interval

1237

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

1238

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

1239

1240

if (debug){

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1242

}

1243

1244

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1249

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1251

return 0;

1252

}

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1255

if(ret == -1){

1256

perror_plus("clock_gettime");

1257

return -1;

1258

}

1259

mc.current_server = mc.current_server->next;

1260

block_time = 0; /* Call avahi to find new Mandos

1261

servers, but don't block */

1262

}

1263

1264

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

1265

}

1266

if(ret != 0){

1267

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

1268

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

1269

}

1270

}

1271

}

1272

}

1273

1129

1274

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

1130

1275

AvahiSServiceBrowser *sb = NULL;

1131

1276

int error;

1148

1293

bool gnutls_initialized = false;

1149

1294

bool gpgme_initialized = false;

1150

1295

float delay = 2.5f;

1296

double retry_interval = 10; /* 10s between trying a server and

1297

retrying the same server again */

1151

1298

1152

1299

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1153

1300

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1159

1306

errno = 0;

1160

1307

ret = setgid(gid);

1161

1308

if(ret == -1){

1162

perror("setgid");

1309

perror_plus("setgid");

1163

1310

}

1164

1311

1165

1312

/* Lower user privileges (temporarily) */

1166

1313

errno = 0;

1167

1314

ret = seteuid(uid);

1168

1315

if(ret == -1){

1169

perror("seteuid");

1316

perror_plus("seteuid");

1170

1317

}

1171

1318

1172

1319

if(quit_now){

1207

1354

.arg = "SECONDS",

1208

1355

.doc = "Maximum delay to wait for interface startup",

1209

1356

.group = 2 },

1357

{ .name = "retry", .key = 132,

1358

.arg = "SECONDS",

1359

.doc = "Retry interval used when denied by the mandos server",

1360

.group = 2 },

1210

1361

/*

1211

1362

* These reproduce what we would get without ARGP_NO_HELP

1212

1363

*/

1256

1407

if(errno != 0 or tmp == arg or *tmp != '\0'){

1257

1408

argp_error(state, "Bad delay");

1258

1409

}

1410

case 132: /* --retry */

1411

errno = 0;

1412

retry_interval = strtod(arg, &tmp);

1413

if(errno != 0 or tmp == arg or *tmp != '\0'

1414

or (retry_interval * 1000) > INT_MAX){

1415

argp_error(state, "Bad retry interval");

1416

}

1259

1417

break;

1260

1418

/*

1261

1419

* These reproduce what we would get without ARGP_NO_HELP

1289

1447

case ENOMEM:

1290

1448

default:

1291

1449

errno = ret;

1292

perror("argp_parse");

1450

perror_plus("argp_parse");

1293

1451

exitcode = EX_OSERR;

1294

1452

goto end;

1295

1453

case EINVAL:

1313

1471

fprintf(stderr, "Using interface \"%s\"\n", interface);

1314

1472

}

1315

1473

if(interface == NULL){

1316

perror("malloc");

1474

perror_plus("malloc");

1317

1475

free(direntries);

1318

1476

exitcode = EXIT_FAILURE;

1319

1477

goto end;

1341

1499

sigemptyset(&sigterm_action.sa_mask);

1342

1500

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1343

1501

if(ret == -1){

1344

perror("sigaddset");

1502

perror_plus("sigaddset");

1345

1503

exitcode = EX_OSERR;

1346

1504

goto end;

1347

1505

}

1348

1506

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1349

1507

if(ret == -1){

1350

perror("sigaddset");

1508

perror_plus("sigaddset");

1351

1509

exitcode = EX_OSERR;

1352

1510

goto end;

1353

1511

}

1354

1512

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1355

1513

if(ret == -1){

1356

perror("sigaddset");

1514

perror_plus("sigaddset");

1357

1515

exitcode = EX_OSERR;

1358

1516

goto end;

1359

1517

}

1363

1521

*/

1364

1522

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1365

1523

if(ret == -1){

1366

perror("sigaction");

1524

perror_plus("sigaction");

1367

1525

return EX_OSERR;

1368

1526

}

1369

1527

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

1528

ret = sigaction(SIGINT, &sigterm_action, NULL);

1371

1529

if(ret == -1){

1372

perror("sigaction");

1530

perror_plus("sigaction");

1373

1531

exitcode = EX_OSERR;

1374

1532

goto end;

1375

1533

}

1376

1534

}

1377

1535

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1378

1536

if(ret == -1){

1379

perror("sigaction");

1537

perror_plus("sigaction");

1380

1538

return EX_OSERR;

1381

1539

}

1382

1540

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

1541

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1384

1542

if(ret == -1){

1385

perror("sigaction");

1543

perror_plus("sigaction");

1386

1544

exitcode = EX_OSERR;

1387

1545

goto end;

1388

1546

}

1389

1547

}

1390

1548

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1391

1549

if(ret == -1){

1392

perror("sigaction");

1550

perror_plus("sigaction");

1393

1551

return EX_OSERR;

1394

1552

}

1395

1553

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

1554

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1397

1555

if(ret == -1){

1398

perror("sigaction");

1556

perror_plus("sigaction");

1399

1557

exitcode = EX_OSERR;

1400

1558

goto end;

1401

1559

}

1418

1576

errno = 0;

1419

1577

ret = seteuid(0);

1420

1578

if(ret == -1){

1421

perror("seteuid");

1579

perror_plus("seteuid");

1422

1580

}

1423

1581

1424

1582

#ifdef __linux__

1428

1586

bool restore_loglevel = true;

1429

1587

if(ret == -1){

1430

1588

restore_loglevel = false;

1431

perror("klogctl");

1589

perror_plus("klogctl");

1432

1590

}

1433

1591

#endif /* __linux__ */

1434

1592

1435

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1594

if(sd < 0){

1437

perror("socket");

1595

perror_plus("socket");

1438

1596

exitcode = EX_OSERR;

1439

1597

#ifdef __linux__

1440

1598

if(restore_loglevel){

1441

1599

ret = klogctl(7, NULL, 0);

1442

1600

if(ret == -1){

1443

perror("klogctl");

1601

perror_plus("klogctl");

1444

1602

}

1445

1603

}

1446

1604

#endif /* __linux__ */

1448

1606

errno = 0;

1449

1607

ret = seteuid(uid);

1450

1608

if(ret == -1){

1451

perror("seteuid");

1609

perror_plus("seteuid");

1452

1610

}

1453

1611

goto end;

1454

1612

}

1455

1613

strcpy(network.ifr_name, interface);

1456

1614

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1457

1615

if(ret == -1){

1458

perror("ioctl SIOCGIFFLAGS");

1616

perror_plus("ioctl SIOCGIFFLAGS");

1459

1617

#ifdef __linux__

1460

1618

if(restore_loglevel){

1461

1619

ret = klogctl(7, NULL, 0);

1462

1620

if(ret == -1){

1463

perror("klogctl");

1621

perror_plus("klogctl");

1464

1622

}

1465

1623

}

1466

1624

#endif /* __linux__ */

1469

1627

errno = 0;

1470

1628

ret = seteuid(uid);

1471

1629

if(ret == -1){

1472

perror("seteuid");

1630

perror_plus("seteuid");

1473

1631

}

1474

1632

goto end;

1475

1633

}

1479

1637

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

1480

1638

if(ret == -1){

1481

1639

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1483

1641

exitcode = EX_OSERR;

1484

1642

#ifdef __linux__

1485

1643

if(restore_loglevel){

1486

1644

ret = klogctl(7, NULL, 0);

1487

1645

if(ret == -1){

1488

perror("klogctl");

1646

perror_plus("klogctl");

1489

1647

}

1490

1648

}

1491

1649

#endif /* __linux__ */

1493

1651

errno = 0;

1494

1652

ret = seteuid(uid);

1495

1653

if(ret == -1){

1496

perror("seteuid");

1654

perror_plus("seteuid");

1497

1655

}

1498

1656

goto end;

1499

1657

}

1500

1658

}

1501

/* sleep checking until interface is running */

1659

/* Sleep checking until interface is running.

1660

Check every 0.25s, up to total time of delay */

1502

1661

for(int i=0; i < delay * 4; i++){

1503

1662

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1504

1663

if(ret == -1){

1505

perror("ioctl SIOCGIFFLAGS");

1664

perror_plus("ioctl SIOCGIFFLAGS");

1506

1665

} else if(network.ifr_flags & IFF_RUNNING){

1507

1666

break;

1508

1667

}

1509

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1510

1669

ret = nanosleep(&sleeptime, NULL);

1511

1670

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

1512

perror("nanosleep");

1671

perror_plus("nanosleep");

1513

1672

}

1514

1673

}

1515

1674

if(not take_down_interface){

1516

1675

/* We won't need the socket anymore */

1517

1676

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

1518

1677

if(ret == -1){

1519

perror("close");

1678

perror_plus("close");

1520

1679

}

1521

1680

}

1522

1681

#ifdef __linux__

1524

1683

/* Restores kernel loglevel to default */

1525

1684

ret = klogctl(7, NULL, 0);

1526

1685

if(ret == -1){

1527

perror("klogctl");

1686

perror_plus("klogctl");

1528

1687

}

1529

1688

}

1530

1689

#endif /* __linux__ */

1534

1693

/* Lower privileges */

1535

1694

ret = seteuid(uid);

1536

1695

if(ret == -1){

1537

perror("seteuid");

1696

perror_plus("seteuid");

1538

1697

}

1539

1698

} else {

1540

1699

/* Lower privileges permanently */

1541

1700

ret = setuid(uid);

1542

1701

if(ret == -1){

1543

perror("setuid");

1702

perror_plus("setuid");

1544

1703

}

1545

1704

}

1546

1705

}

1562

1721

goto end;

1563

1722

}

1564

1723

1724

if(mkdtemp(tempdir) == NULL){

1725

perror_plus("mkdtemp");

1726

goto end;

1727

}

1565

1728

tempdir_created = true;

1566

if(mkdtemp(tempdir) == NULL){

1567

tempdir_created = false;

1568

perror("mkdtemp");

1569

goto end;

1570

}

1571

1729

1572

1730

if(quit_now){

1573

1731

goto end;

1633

1791

if(quit_now or ret == 0){

1634

1792

break;

1635

1793

}

1636

sleep(15);

1794

sleep((int)retry_interval or 1);

1637

1795

};

1638

1796

1639

1797

if (not quit_now){

1697

1855

if(debug){

1698

1856

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

1699

1857

}

1700

1701

avahi_simple_poll_loop(mc.simple_poll);

1858

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

(int)(retry_interval * 1000));

1861

if(debug){

1862

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1863

(ret == 0) ? "successfully" : "with error");

1864

}

1702

1865

1703

1866

end:

1704

1867

1725

1888

if(gpgme_initialized){

1726

1889

gpgme_release(mc.ctx);

1727

1890

}

1891

1892

/* Cleans up the circular linked list of Mandos servers the client

1893

has seen */

1894

if(mc.current_server != NULL){

1895

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

1896

while(mc.current_server != NULL){

1897

server *next = mc.current_server->next;

1898

free(mc.current_server);

1899

mc.current_server = next;

1900

}

1901

}

1728

1902

1729

1903

/* Take down the network interface */

1730

1904

if(take_down_interface){

1732

1906

errno = 0;

1733

1907

ret = seteuid(0);

1734

1908

if(ret == -1){

1735

perror("seteuid");

1909

perror_plus("seteuid");

1736

1910

}

1737

1911

if(geteuid() == 0){

1738

1912

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1739

1913

if(ret == -1){

1740

perror("ioctl SIOCGIFFLAGS");

1914

perror_plus("ioctl SIOCGIFFLAGS");

1741

1915

} else if(network.ifr_flags & IFF_UP) {

1742

1916

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

1743

1917

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

1744

1918

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1746

1920

}

1747

1921

}

1748

1922

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

1749

1923

if(ret == -1){

1750

perror("close");

1924

perror_plus("close");

1751

1925

}

1752

1926

/* Lower privileges permanently */

1753

1927

errno = 0;

1754

1928

ret = setuid(uid);

1755

1929

if(ret == -1){

1756

perror("setuid");

1930

perror_plus("setuid");

1757

1931

}

1758

1932

}

1759

1933

}

1760

1934

1761

/* Removes the temp directory used by GPGME */

1935

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

1762

1936

if(tempdir_created){

1763

DIR *d;

1764

struct dirent *direntry;

1765

d = opendir(tempdir);

1766

if(d == NULL){

1767

if(errno != ENOENT){

1768

perror("opendir");

1769

}

1770

} else {

1771

while(true){

1772

direntry = readdir(d);

1773

if(direntry == NULL){

1774

break;

1775

}

1776

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

1777

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

1778

and (direntry->d_name[1] == '\0'

1779

or (direntry->d_name[1] == '.'

1780

and direntry->d_name[2] == '\0'))){

1781

continue;

1782

}

1937

struct dirent **direntries = NULL;

1938

struct dirent *direntry = NULL;

1939

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1940

if (ret > 0){

1941

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

1942

direntry = direntries[i];

1783

1943

char *fullname = NULL;

1784

1944

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

1785

1945

direntry->d_name);

1786

1946

if(ret < 0){

1787

perror("asprintf");

1947

perror_plus("asprintf");

1788

1948

continue;

1789

1949

}

1790

1950

ret = remove(fullname);

1794

1954

}

1795

1955

free(fullname);

1796

1956

}

1797

closedir(d);

1957

}

1958

1959

/* need to be cleaned even if ret == 0 because man page doesn't

1960

specify */

1961

free(direntries);

1962

if (ret == -1){

1963

perror_plus("scandir");

1798

1964

}

1799

1965

ret = rmdir(tempdir);

1800

1966

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

1801

perror("rmdir");

1967

perror_plus("rmdir");

1802

1968

}

1803

1969

}

1804

1970

1809

1975

&old_sigterm_action,

1810

1976

NULL));

1811

1977

if(ret == -1){

1812

perror("sigaction");

1978

perror_plus("sigaction");

1813

1979

}

1814

1980

do {

1815

1981

ret = raise(signal_received);

1816

1982

} while(ret != 0 and errno == EINTR);

1817

1983

if(ret != 0){

1818

perror("raise");

1984

perror_plus("raise");

1819

1985

abort();

1820

1986

}

1821

1987

TEMP_FAILURE_RETRY(pause());