/mandos/trunk : revision 480

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

65

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

67

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

131

130

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

132

131

char *connect_to = NULL;

133

132

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

145

133

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

146

134

typedef struct {

147

135

AvahiSimplePoll *simple_poll;

151

139

gnutls_dh_params_t dh_params;

152

140

const char *priority;

153

141

gpgme_ctx_t ctx;

154

server *current_server;

155

142

} mandos_context;

156

143

157

144

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

158

145

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

159

146

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

147

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

162

148

163

149

sig_atomic_t quit_now = 0;

164

150

int signal_received = 0;

165

151

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

173

152

/*

174

153

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

175

154

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

187

166

return buffer_capacity;

188

167

}

189

168

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

227

169

/*

228

170

* Initialize GPGME.

229

171

*/

243

185

244

186

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

245

187

if(fd == -1){

246

perror_plus("open");

188

perror("open");

247

189

return false;

248

190

}

249

191

263

205

264

206

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

265

207

if(ret == -1){

266

perror_plus("close");

208

perror("close");

267

209

}

268

210

gpgme_data_release(pgp_data);

269

211

return true;

394

336

395

337

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

396

338

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

397

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

398

340

plaintext_length = -1;

399

341

goto decrypt_end;

400

342

}

405

347

(size_t)plaintext_length,

406

348

plaintext_capacity);

407

349

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

350

perror("incbuffer");

409

351

plaintext_length = -1;

410

352

goto decrypt_end;

411

353

}

418

360

break;

419

361

}

420

362

if(ret < 0){

421

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

422

364

plaintext_length = -1;

423

365

goto decrypt_end;

424

366

}

481

423

}

482

424

483

425

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

485

427

if(ret != GNUTLS_E_SUCCESS){

486

fprintf(stderr, "GnuTLS memory error: %s\n",

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

487

432

safer_gnutls_strerror(ret));

488

433

gnutls_global_deinit();

489

434

return -1;

644

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

590

if(tcp_sd < 0){

646

591

int e = errno;

647

perror_plus("socket");

592

perror("socket");

648

593

errno = e;

649

594

goto mandos_end;

650

595

}

664

609

}

665

610

if(ret < 0 ){

666

611

int e = errno;

667

perror_plus("inet_pton");

612

perror("inet_pton");

668

613

errno = e;

669

614

goto mandos_end;

670

615

}

706

651

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

707

652

char interface[IF_NAMESIZE];

708

653

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

709

perror_plus("if_indextoname");

654

perror("if_indextoname");

710

655

} else {

711

656

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

712

657

ip, interface, port);

726

671

sizeof(addrstr));

727

672

}

728

673

if(pcret == NULL){

729

perror_plus("inet_ntop");

674

perror("inet_ntop");

730

675

} else {

731

676

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

732

677

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

747

692

if(ret < 0){

748

693

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

749

694

int e = errno;

750

perror_plus("connect");

695

perror("connect");

751

696

errno = e;

752

697

}

753

698

goto mandos_end;

766

711

out_size - written));

767

712

if(ret == -1){

768

713

int e = errno;

769

perror_plus("write");

714

perror("write");

770

715

errno = e;

771

716

goto mandos_end;

772

717

}

797

742

goto mandos_end;

798

743

}

799

744

800

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

801

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

746

803

747

if(quit_now){

840

784

buffer_capacity);

841

785

if(buffer_capacity == 0){

842

786

int e = errno;

843

perror_plus("incbuffer");

787

perror("incbuffer");

844

788

errno = e;

845

789

goto mandos_end;

846

790

}

951

895

if(e == 0){

952

896

e = errno;

953

897

}

954

perror_plus("close");

898

perror("close");

955

899

}

956

900

gnutls_deinit(session);

957

errno = e;

958

901

if(quit_now){

959

errno = EINTR;

902

e = EINTR;

960

903

retval = -1;

961

904

}

905

errno = e;

962

906

}

963

907

return retval;

964

908

}

1007

951

avahi_proto_to_af(proto));

1008

952

if(ret == 0){

1009

953

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

954

}

1014

955

}

1015

956

}

1069

1010

}

1070

1011

}

1071

1012

1072

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

1013

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

1073

1014

static void handle_sigterm(int sig){

1074

1015

if(quit_now){

1075

1016

return;

1077

1018

quit_now = 1;

1078

1019

signal_received = sig;

1079

1020

int old_errno = errno;

1080

/* set main loop to exit */

1081

1021

if(mc.simple_poll != NULL){

1082

1022

avahi_simple_poll_quit(mc.simple_poll);

1083

1023

}

1098

1038

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

1099

1039

if_entry->d_name);

1100

1040

if(ret < 0){

1101

perror_plus("asprintf");

1041

perror("asprintf");

1102

1042

return 0;

1103

1043

}

1104

1044

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

1105

1045

if(flags_fd == -1){

1106

perror_plus("open");

1046

perror("open");

1107

1047

free(flagname);

1108

1048

return 0;

1109

1049

}

1110

1050

free(flagname);

1111

1051

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

1052

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1053

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1114

1054

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

1115

1055

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

1116

1056

if(flagstring == NULL){

1117

perror_plus("malloc");

1057

perror("malloc");

1118

1058

close(flags_fd);

1119

1059

return 0;

1120

1060

}

1122

1062

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

1123

1063

(size_t)to_read));

1124

1064

if(ssret == -1){

1125

perror_plus("read");

1065

perror("read");

1126

1066

free(flagstring);

1127

1067

close(flags_fd);

1128

1068

return 0;

1173

1113

}

1174

1114

return 0;

1175

1115

}

1176

/* Reject non-ARP interfaces (including dummy interfaces) */

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

1116

/* Accept this device */

1185

1117

if(debug){

1186

1118

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1189

1121

return 1;

1190

1122

}

1191

1123

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

1274

1124

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

1275

1125

AvahiSServiceBrowser *sb = NULL;

1276

1126

int error;

1293

1143

bool gnutls_initialized = false;

1294

1144

bool gpgme_initialized = false;

1295

1145

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

1146

1299

1147

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1300

1148

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1306

1154

errno = 0;

1307

1155

ret = setgid(gid);

1308

1156

if(ret == -1){

1309

perror_plus("setgid");

1157

perror("setgid");

1310

1158

}

1311

1159

1312

1160

/* Lower user privileges (temporarily) */

1313

1161

errno = 0;

1314

1162

ret = seteuid(uid);

1315

1163

if(ret == -1){

1316

perror_plus("seteuid");

1164

perror("seteuid");

1317

1165

}

1318

1166

1319

1167

if(quit_now){

1354

1202

.arg = "SECONDS",

1355

1203

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

1356

1204

.group = 2 },

1357

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

1358

.arg = "SECONDS",

1359

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

1360

.group = 2 },

1361

1205

/*

1362

1206

* These reproduce what we would get without ARGP_NO_HELP

1363

1207

*/

1407

1251

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

1408

1252

argp_error(state, "Bad delay");

1409

1253

}

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

}

1417

1254

break;

1418

1255

/*

1419

1256

* These reproduce what we would get without ARGP_NO_HELP

1447

1284

case ENOMEM:

1448

1285

default:

1449

1286

errno = ret;

1450

perror_plus("argp_parse");

1287

perror("argp_parse");

1451

1288

exitcode = EX_OSERR;

1452

1289

goto end;

1453

1290

case EINVAL:

1471

1308

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

1472

1309

}

1473

1310

if(interface == NULL){

1474

perror_plus("malloc");

1311

perror("malloc");

1475

1312

free(direntries);

1476

1313

exitcode = EXIT_FAILURE;

1477

1314

goto end;

1499

1336

sigemptyset(&sigterm_action.sa_mask);

1500

1337

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

1501

1338

if(ret == -1){

1502

perror_plus("sigaddset");

1339

perror("sigaddset");

1503

1340

exitcode = EX_OSERR;

1504

1341

goto end;

1505

1342

}

1506

1343

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

1507

1344

if(ret == -1){

1508

perror_plus("sigaddset");

1345

perror("sigaddset");

1509

1346

exitcode = EX_OSERR;

1510

1347

goto end;

1511

1348

}

1512

1349

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

1513

1350

if(ret == -1){

1514

perror_plus("sigaddset");

1351

perror("sigaddset");

1515

1352

exitcode = EX_OSERR;

1516

1353

goto end;

1517

1354

}

1521

1358

*/

1522

1359

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

1523

1360

if(ret == -1){

1524

perror_plus("sigaction");

1361

perror("sigaction");

1525

1362

return EX_OSERR;

1526

1363

}

1527

1364

if(old_sigterm_action.sa_handler != SIG_IGN){

1528

1365

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

1529

1366

if(ret == -1){

1530

perror_plus("sigaction");

1367

perror("sigaction");

1531

1368

exitcode = EX_OSERR;

1532

1369

goto end;

1533

1370

}

1534

1371

}

1535

1372

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

1536

1373

if(ret == -1){

1537

perror_plus("sigaction");

1374

perror("sigaction");

1538

1375

return EX_OSERR;

1539

1376

}

1540

1377

if(old_sigterm_action.sa_handler != SIG_IGN){

1541

1378

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

1542

1379

if(ret == -1){

1543

perror_plus("sigaction");

1380

perror("sigaction");

1544

1381

exitcode = EX_OSERR;

1545

1382

goto end;

1546

1383

}

1547

1384

}

1548

1385

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

1549

1386

if(ret == -1){

1550

perror_plus("sigaction");

1387

perror("sigaction");

1551

1388

return EX_OSERR;

1552

1389

}

1553

1390

if(old_sigterm_action.sa_handler != SIG_IGN){

1554

1391

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

1555

1392

if(ret == -1){

1556

perror_plus("sigaction");

1393

perror("sigaction");

1557

1394

exitcode = EX_OSERR;

1558

1395

goto end;

1559

1396

}

1576

1413

errno = 0;

1577

1414

ret = seteuid(0);

1578

1415

if(ret == -1){

1579

perror_plus("seteuid");

1416

perror("seteuid");

1580

1417

}

1581

1418

1582

1419

#ifdef __linux__

1586

1423

bool restore_loglevel = true;

1587

1424

if(ret == -1){

1588

1425

restore_loglevel = false;

1589

perror_plus("klogctl");

1426

perror("klogctl");

1590

1427

}

1591

1428

#endif /* __linux__ */

1592

1429

1593

1430

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

1431

if(sd < 0){

1595

perror_plus("socket");

1432

perror("socket");

1596

1433

exitcode = EX_OSERR;

1597

1434

#ifdef __linux__

1598

1435

if(restore_loglevel){

1599

1436

ret = klogctl(7, NULL, 0);

1600

1437

if(ret == -1){

1601

perror_plus("klogctl");

1438

perror("klogctl");

1602

1439

}

1603

1440

}

1604

1441

#endif /* __linux__ */

1606

1443

errno = 0;

1607

1444

ret = seteuid(uid);

1608

1445

if(ret == -1){

1609

perror_plus("seteuid");

1446

perror("seteuid");

1610

1447

}

1611

1448

goto end;

1612

1449

}

1613

1450

strcpy(network.ifr_name, interface);

1614

1451

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

1615

1452

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1453

perror("ioctl SIOCGIFFLAGS");

1617

1454

#ifdef __linux__

1618

1455

if(restore_loglevel){

1619

1456

ret = klogctl(7, NULL, 0);

1620

1457

if(ret == -1){

1621

perror_plus("klogctl");

1458

perror("klogctl");

1622

1459

}

1623

1460

}

1624

1461

#endif /* __linux__ */

1627

1464

errno = 0;

1628

1465

ret = seteuid(uid);

1629

1466

if(ret == -1){

1630

perror_plus("seteuid");

1467

perror("seteuid");

1631

1468

}

1632

1469

goto end;

1633

1470

}

1637

1474

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

1638

1475

if(ret == -1){

1639

1476

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1477

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1641

1478

exitcode = EX_OSERR;

1642

1479

#ifdef __linux__

1643

1480

if(restore_loglevel){

1644

1481

ret = klogctl(7, NULL, 0);

1645

1482

if(ret == -1){

1646

perror_plus("klogctl");

1483

perror("klogctl");

1647

1484

}

1648

1485

}

1649

1486

#endif /* __linux__ */

1651

1488

errno = 0;

1652

1489

ret = seteuid(uid);

1653

1490

if(ret == -1){

1654

perror_plus("seteuid");

1491

perror("seteuid");

1655

1492

}

1656

1493

goto end;

1657

1494

}

1658

1495

}

1659

/* Sleep checking until interface is running.

1660

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

1496

/* sleep checking until interface is running */

1661

1497

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

1662

1498

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

1663

1499

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1500

perror("ioctl SIOCGIFFLAGS");

1665

1501

} else if(network.ifr_flags & IFF_RUNNING){

1666

1502

break;

1667

1503

}

1668

1504

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

1505

ret = nanosleep(&sleeptime, NULL);

1670

1506

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

1671

perror_plus("nanosleep");

1507

perror("nanosleep");

1672

1508

}

1673

1509

}

1674

1510

if(not take_down_interface){

1675

1511

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

1676

1512

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

1677

1513

if(ret == -1){

1678

perror_plus("close");

1514

perror("close");

1679

1515

}

1680

1516

}

1681

1517

#ifdef __linux__

1683

1519

/* Restores kernel loglevel to default */

1684

1520

ret = klogctl(7, NULL, 0);

1685

1521

if(ret == -1){

1686

perror_plus("klogctl");

1522

perror("klogctl");

1687

1523

}

1688

1524

}

1689

1525

#endif /* __linux__ */

1693

1529

/* Lower privileges */

1694

1530

ret = seteuid(uid);

1695

1531

if(ret == -1){

1696

perror_plus("seteuid");

1532

perror("seteuid");

1697

1533

}

1698

1534

} else {

1699

1535

/* Lower privileges permanently */

1700

1536

ret = setuid(uid);

1701

1537

if(ret == -1){

1702

perror_plus("setuid");

1538

perror("setuid");

1703

1539

}

1704

1540

}

1705

1541

}

1721

1557

goto end;

1722

1558

}

1723

1559

1560

tempdir_created = true;

1724

1561

if(mkdtemp(tempdir) == NULL){

1725

perror_plus("mkdtemp");

1562

tempdir_created = false;

1563

perror("mkdtemp");

1726

1564

goto end;

1727

1565

}

1728

tempdir_created = true;

1729

1566

1730

1567

if(quit_now){

1731

1568

goto end;

1791

1628

if(quit_now or ret == 0){

1792

1629

break;

1793

1630

}

1794

sleep((int)retry_interval or 1);

1631

sleep(15);

1795

1632

};

1796

1633

1797

1634

if (not quit_now){

1855

1692

if(debug){

1856

1693

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

1857

1694

}

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

}

1695

1696

avahi_simple_poll_loop(mc.simple_poll);

1865

1697

1866

1698

end:

1867

1699

1888

1720

if(gpgme_initialized){

1889

1721

gpgme_release(mc.ctx);

1890

1722

}

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

}

1902

1723

1903

1724

/* Take down the network interface */

1904

1725

if(take_down_interface){

1906

1727

errno = 0;

1907

1728

ret = seteuid(0);

1908

1729

if(ret == -1){

1909

perror_plus("seteuid");

1730

perror("seteuid");

1910

1731

}

1911

1732

if(geteuid() == 0){

1912

1733

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

1913

1734

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1735

perror("ioctl SIOCGIFFLAGS");

1915

1736

} else if(network.ifr_flags & IFF_UP) {

1916

1737

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

1917

1738

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

1918

1739

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1740

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1920

1741

}

1921

1742

}

1922

1743

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

1923

1744

if(ret == -1){

1924

perror_plus("close");

1745

perror("close");

1925

1746

}

1926

1747

/* Lower privileges permanently */

1927

1748

errno = 0;

1928

1749

ret = setuid(uid);

1929

1750

if(ret == -1){

1930

perror_plus("setuid");

1751

perror("setuid");

1931

1752

}

1932

1753

}

1933

1754

}

1934

1755

1935

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

1756

/* Removes the temp directory used by GPGME */

1936

1757

if(tempdir_created){

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];

1758

DIR *d;

1759

struct dirent *direntry;

1760

d = opendir(tempdir);

1761

if(d == NULL){

1762

if(errno != ENOENT){

1763

perror("opendir");

1764

}

1765

} else {

1766

while(true){

1767

direntry = readdir(d);

1768

if(direntry == NULL){

1769

break;

1770

}

1771

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

1772

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

1773

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

1774

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

1775

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

1776

continue;

1777

}

1943

1778

char *fullname = NULL;

1944

1779

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

1945

1780

direntry->d_name);

1946

1781

if(ret < 0){

1947

perror_plus("asprintf");

1782

perror("asprintf");

1948

1783

continue;

1949

1784

}

1950

1785

ret = remove(fullname);

1954

1789

}

1955

1790

free(fullname);

1956

1791

}

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");

1792

closedir(d);

1964

1793

}

1965

1794

ret = rmdir(tempdir);

1966

1795

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

1967

perror_plus("rmdir");

1796

perror("rmdir");

1968

1797

}

1969

1798

}

1970

1799

1975

1804

&old_sigterm_action,

1976

1805

NULL));

1977

1806

if(ret == -1){

1978

perror_plus("sigaction");

1807

perror("sigaction");

1979

1808

}

1980

1809

do {

1981

1810

ret = raise(signal_received);

1982

1811

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

1983

1812

if(ret != 0){

1984

perror_plus("raise");

1813

perror("raise");

1985

1814

abort();

1986

1815

}

1987

1816

TEMP_FAILURE_RETRY(pause());