/mandos/trunk : revision 500

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(),

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

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

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

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

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

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

214

} else {

215

new_server->next = mc.current_server;

216

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

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

169

228

/*

170

229

* Initialize GPGME.

171

230

*/

185

244

186

245

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

187

246

if(fd == -1){

188

perror("open");

247

perror_plus("open");

189

248

return false;

190

249

}

191

250

205

264

206

265

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

207

266

if(ret == -1){

208

perror("close");

267

perror_plus("close");

209

268

}

210

269

gpgme_data_release(pgp_data);

211

270

return true;

224

283

return false;

225

284

}

226

285

227

/* Set GPGME home directory for the OpenPGP engine only */

286

/* Set GPGME home directory for the OpenPGP engine only */

228

287

rc = gpgme_get_engine_info(&engine_info);

229

288

if(rc != GPG_ERR_NO_ERROR){

230

289

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

336

395

337

396

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

338

397

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

339

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

340

399

plaintext_length = -1;

341

400

goto decrypt_end;

342

401

}

347

406

(size_t)plaintext_length,

348

407

plaintext_capacity);

349

408

if(plaintext_capacity == 0){

350

perror("incbuffer");

409

perror_plus("incbuffer");

351

410

plaintext_length = -1;

352

411

goto decrypt_end;

353

412

}

360

419

break;

361

420

}

362

421

if(ret < 0){

363

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

364

423

plaintext_length = -1;

365

424

goto decrypt_end;

366

425

}

423

482

}

424

483

425

484

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

486

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

487

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

432

488

safer_gnutls_strerror(ret));

433

489

gnutls_global_deinit();

434

490

return -1;

589

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

646

if(tcp_sd < 0){

591

647

int e = errno;

592

perror("socket");

648

perror_plus("socket");

593

649

errno = e;

594

650

goto mandos_end;

595

651

}

609

665

}

610

666

if(ret < 0 ){

611

667

int e = errno;

612

perror("inet_pton");

668

perror_plus("inet_pton");

613

669

errno = e;

614

670

goto mandos_end;

615

671

}

651

707

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

652

708

char interface[IF_NAMESIZE];

653

709

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

654

perror("if_indextoname");

710

perror_plus("if_indextoname");

655

711

} else {

656

712

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

657

713

ip, interface, port);

671

727

sizeof(addrstr));

672

728

}

673

729

if(pcret == NULL){

674

perror("inet_ntop");

730

perror_plus("inet_ntop");

675

731

} else {

676

732

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

677

733

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

692

748

if(ret < 0){

693

749

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

694

750

int e = errno;

695

perror("connect");

751

perror_plus("connect");

696

752

errno = e;

697

753

}

698

754

goto mandos_end;

711

767

out_size - written));

712

768

if(ret == -1){

713

769

int e = errno;

714

perror("write");

770

perror_plus("write");

715

771

errno = e;

716

772

goto mandos_end;

717

773

}

742

798

goto mandos_end;

743

799

}

744

800

801

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

745

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

803

747

804

if(quit_now){

784

841

buffer_capacity);

785

842

if(buffer_capacity == 0){

786

843

int e = errno;

787

perror("incbuffer");

844

perror_plus("incbuffer");

788

845

errno = e;

789

846

goto mandos_end;

790

847

}

895

952

if(e == 0){

896

953

e = errno;

897

954

}

898

perror("close");

955

perror_plus("close");

899

956

}

900

957

gnutls_deinit(session);

958

errno = e;

901

959

if(quit_now){

902

e = EINTR;

960

errno = EINTR;

903

961

retval = -1;

904

962

}

905

errno = e;

906

963

}

907

964

return retval;

908

965

}

951

1008

avahi_proto_to_af(proto));

952

1009

if(ret == 0){

953

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

954

1014

}

955

1015

}

956

1016

}

1010

1070

}

1011

1071

}

1012

1072

1013

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

1073

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

1014

1074

static void handle_sigterm(int sig){

1015

1075

if(quit_now){

1016

1076

return;

1018

1078

quit_now = 1;

1019

1079

signal_received = sig;

1020

1080

int old_errno = errno;

1081

/* set main loop to exit */

1021

1082

if(mc.simple_poll != NULL){

1022

1083

avahi_simple_poll_quit(mc.simple_poll);

1023

1084

}

1038

1099

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

1039

1100

if_entry->d_name);

1040

1101

if(ret < 0){

1041

perror("asprintf");

1102

perror_plus("asprintf");

1042

1103

return 0;

1043

1104

}

1044

1105

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

1045

1106

if(flags_fd == -1){

1046

perror("open");

1107

perror_plus("open");

1047

1108

free(flagname);

1048

1109

return 0;

1049

1110

}

1050

1111

free(flagname);

1051

1112

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

1052

1113

/* read line from flags_fd */

1053

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

1114

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

1054

1115

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

1055

1116

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

1056

1117

if(flagstring == NULL){

1057

perror("malloc");

1118

perror_plus("malloc");

1058

1119

close(flags_fd);

1059

1120

return 0;

1060

1121

}

1062

1123

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

1063

1124

(size_t)to_read));

1064

1125

if(ssret == -1){

1065

perror("read");

1126

perror_plus("read");

1066

1127

free(flagstring);

1067

1128

close(flags_fd);

1068

1129

return 0;

1129

1190

return 1;

1130

1191

}

1131

1192

1193

int notdotentries(const struct dirent *direntry){

1194

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

1195

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

1196

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

1197

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

1198

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

1199

return 0;

1200

}

1201

return 1;

1202

}

1203

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

int ret;

1206

struct timespec now;

1207

struct timespec waited_time;

1208

intmax_t block_time;

1209

1210

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1215

}

1216

ret = avahi_simple_poll_iterate(s, -1);

1217

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1221

}

1222

/* the current time */

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

if(ret == -1){

1225

perror_plus("clock_gettime");

1226

return -1;

1227

}

1228

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

1229

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

1230

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1232

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1234

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

1235

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

1236

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

1237

block_time = ((retry_interval

1238

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

1239

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

1240

1241

if (debug){

1242

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

1243

}

1244

1245

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1250

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1252

return 0;

1253

}

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1256

if(ret == -1){

1257

perror_plus("clock_gettime");

1258

return -1;

1259

}

1260

mc.current_server = mc.current_server->next;

1261

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

1262

servers, but don't block */

1263

}

1264

1265

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

1266

}

1267

if(ret != 0){

1268

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

1269

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

1270

}

1271

}

1272

}

1273

}

1274

1132

1275

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

1133

1276

AvahiSServiceBrowser *sb = NULL;

1134

1277

int error;

1151

1294

bool gnutls_initialized = false;

1152

1295

bool gpgme_initialized = false;

1153

1296

float delay = 2.5f;

1297

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

1298

retrying the same server again */

1154

1299

1155

1300

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1156

1301

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1162

1307

errno = 0;

1163

1308

ret = setgid(gid);

1164

1309

if(ret == -1){

1165

perror("setgid");

1310

perror_plus("setgid");

1166

1311

}

1167

1312

1168

1313

/* Lower user privileges (temporarily) */

1169

1314

errno = 0;

1170

1315

ret = seteuid(uid);

1171

1316

if(ret == -1){

1172

perror("seteuid");

1317

perror_plus("seteuid");

1173

1318

}

1174

1319

1175

1320

if(quit_now){

1210

1355

.arg = "SECONDS",

1211

1356

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

1212

1357

.group = 2 },

1358

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

1359

.arg = "SECONDS",

1360

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

1361

.group = 2 },

1213

1362

/*

1214

1363

* These reproduce what we would get without ARGP_NO_HELP

1215

1364

*/

1259

1408

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

1260

1409

argp_error(state, "Bad delay");

1261

1410

}

1411

case 132: /* --retry */

1412

errno = 0;

1413

retry_interval = strtod(arg, &tmp);

1414

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

1415

or (retry_interval * 1000) > INT_MAX

1416

or retry_interval < 0){

1417

argp_error(state, "Bad retry interval");

1418

}

1262

1419

break;

1263

1420

/*

1264

1421

* These reproduce what we would get without ARGP_NO_HELP

1292

1449

case ENOMEM:

1293

1450

default:

1294

1451

errno = ret;

1295

perror("argp_parse");

1452

perror_plus("argp_parse");

1296

1453

exitcode = EX_OSERR;

1297

1454

goto end;

1298

1455

case EINVAL:

1300

1457

goto end;

1301

1458

}

1302

1459

}

1460

1461

{

1462

/* Work around Debian bug #633582:

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1518

}

1519

}

1303

1520

1304

1521

if(not debug){

1305

1522

avahi_set_log_function(empty_log);

1316

1533

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

1317

1534

}

1318

1535

if(interface == NULL){

1319

perror("malloc");

1536

perror_plus("malloc");

1320

1537

free(direntries);

1321

1538

exitcode = EXIT_FAILURE;

1322

1539

goto end;

1344

1561

sigemptyset(&sigterm_action.sa_mask);

1345

1562

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

1346

1563

if(ret == -1){

1347

perror("sigaddset");

1564

perror_plus("sigaddset");

1348

1565

exitcode = EX_OSERR;

1349

1566

goto end;

1350

1567

}

1351

1568

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

1352

1569

if(ret == -1){

1353

perror("sigaddset");

1570

perror_plus("sigaddset");

1354

1571

exitcode = EX_OSERR;

1355

1572

goto end;

1356

1573

}

1357

1574

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

1358

1575

if(ret == -1){

1359

perror("sigaddset");

1576

perror_plus("sigaddset");

1360

1577

exitcode = EX_OSERR;

1361

1578

goto end;

1362

1579

}

1366

1583

*/

1367

1584

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

1368

1585

if(ret == -1){

1369

perror("sigaction");

1586

perror_plus("sigaction");

1370

1587

return EX_OSERR;

1371

1588

}

1372

1589

if(old_sigterm_action.sa_handler != SIG_IGN){

1373

1590

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

1374

1591

if(ret == -1){

1375

perror("sigaction");

1592

perror_plus("sigaction");

1376

1593

exitcode = EX_OSERR;

1377

1594

goto end;

1378

1595

}

1379

1596

}

1380

1597

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

1381

1598

if(ret == -1){

1382

perror("sigaction");

1599

perror_plus("sigaction");

1383

1600

return EX_OSERR;

1384

1601

}

1385

1602

if(old_sigterm_action.sa_handler != SIG_IGN){

1386

1603

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

1387

1604

if(ret == -1){

1388

perror("sigaction");

1605

perror_plus("sigaction");

1389

1606

exitcode = EX_OSERR;

1390

1607

goto end;

1391

1608

}

1392

1609

}

1393

1610

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

1394

1611

if(ret == -1){

1395

perror("sigaction");

1612

perror_plus("sigaction");

1396

1613

return EX_OSERR;

1397

1614

}

1398

1615

if(old_sigterm_action.sa_handler != SIG_IGN){

1399

1616

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

1400

1617

if(ret == -1){

1401

perror("sigaction");

1618

perror_plus("sigaction");

1402

1619

exitcode = EX_OSERR;

1403

1620

goto end;

1404

1621

}

1421

1638

errno = 0;

1422

1639

ret = seteuid(0);

1423

1640

if(ret == -1){

1424

perror("seteuid");

1641

perror_plus("seteuid");

1425

1642

}

1426

1643

1427

1644

#ifdef __linux__

1431

1648

bool restore_loglevel = true;

1432

1649

if(ret == -1){

1433

1650

restore_loglevel = false;

1434

perror("klogctl");

1651

perror_plus("klogctl");

1435

1652

}

1436

1653

#endif /* __linux__ */

1437

1654

1438

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1439

1656

if(sd < 0){

1440

perror("socket");

1657

perror_plus("socket");

1441

1658

exitcode = EX_OSERR;

1442

1659

#ifdef __linux__

1443

1660

if(restore_loglevel){

1444

1661

ret = klogctl(7, NULL, 0);

1445

1662

if(ret == -1){

1446

perror("klogctl");

1663

perror_plus("klogctl");

1447

1664

}

1448

1665

}

1449

1666

#endif /* __linux__ */

1451

1668

errno = 0;

1452

1669

ret = seteuid(uid);

1453

1670

if(ret == -1){

1454

perror("seteuid");

1671

perror_plus("seteuid");

1455

1672

}

1456

1673

goto end;

1457

1674

}

1458

1675

strcpy(network.ifr_name, interface);

1459

1676

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

1460

1677

if(ret == -1){

1461

perror("ioctl SIOCGIFFLAGS");

1678

perror_plus("ioctl SIOCGIFFLAGS");

1462

1679

#ifdef __linux__

1463

1680

if(restore_loglevel){

1464

1681

ret = klogctl(7, NULL, 0);

1465

1682

if(ret == -1){

1466

perror("klogctl");

1683

perror_plus("klogctl");

1467

1684

}

1468

1685

}

1469

1686

#endif /* __linux__ */

1472

1689

errno = 0;

1473

1690

ret = seteuid(uid);

1474

1691

if(ret == -1){

1475

perror("seteuid");

1692

perror_plus("seteuid");

1476

1693

}

1477

1694

goto end;

1478

1695

}

1482

1699

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

1483

1700

if(ret == -1){

1484

1701

take_down_interface = false;

1485

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1486

1703

exitcode = EX_OSERR;

1487

1704

#ifdef __linux__

1488

1705

if(restore_loglevel){

1489

1706

ret = klogctl(7, NULL, 0);

1490

1707

if(ret == -1){

1491

perror("klogctl");

1708

perror_plus("klogctl");

1492

1709

}

1493

1710

}

1494

1711

#endif /* __linux__ */

1496

1713

errno = 0;

1497

1714

ret = seteuid(uid);

1498

1715

if(ret == -1){

1499

perror("seteuid");

1716

perror_plus("seteuid");

1500

1717

}

1501

1718

goto end;

1502

1719

}

1503

1720

}

1504

/* sleep checking until interface is running */

1721

/* Sleep checking until interface is running.

1722

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

1505

1723

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

1506

1724

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

1507

1725

if(ret == -1){

1508

perror("ioctl SIOCGIFFLAGS");

1726

perror_plus("ioctl SIOCGIFFLAGS");

1509

1727

} else if(network.ifr_flags & IFF_RUNNING){

1510

1728

break;

1511

1729

}

1512

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1513

1731

ret = nanosleep(&sleeptime, NULL);

1514

1732

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

1515

perror("nanosleep");

1733

perror_plus("nanosleep");

1516

1734

}

1517

1735

}

1518

1736

if(not take_down_interface){

1519

1737

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

1520

1738

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

1521

1739

if(ret == -1){

1522

perror("close");

1740

perror_plus("close");

1523

1741

}

1524

1742

}

1525

1743

#ifdef __linux__

1527

1745

/* Restores kernel loglevel to default */

1528

1746

ret = klogctl(7, NULL, 0);

1529

1747

if(ret == -1){

1530

perror("klogctl");

1748

perror_plus("klogctl");

1531

1749

}

1532

1750

}

1533

1751

#endif /* __linux__ */

1537

1755

/* Lower privileges */

1538

1756

ret = seteuid(uid);

1539

1757

if(ret == -1){

1540

perror("seteuid");

1758

perror_plus("seteuid");

1541

1759

}

1542

1760

} else {

1543

1761

/* Lower privileges permanently */

1544

1762

ret = setuid(uid);

1545

1763

if(ret == -1){

1546

perror("setuid");

1764

perror_plus("setuid");

1547

1765

}

1548

1766

}

1549

1767

}

1565

1783

goto end;

1566

1784

}

1567

1785

1786

if(mkdtemp(tempdir) == NULL){

1787

perror_plus("mkdtemp");

1788

goto end;

1789

}

1568

1790

tempdir_created = true;

1569

if(mkdtemp(tempdir) == NULL){

1570

tempdir_created = false;

1571

perror("mkdtemp");

1572

goto end;

1573

}

1574

1791

1575

1792

if(quit_now){

1576

1793

goto end;

1618

1835

1619

1836

port = (uint16_t)tmpmax;

1620

1837

*address = '\0';

1621

address = connect_to;

1622

1838

/* Colon in address indicates IPv6 */

1623

1839

int af;

1624

if(strchr(address, ':') != NULL){

1840

if(strchr(connect_to, ':') != NULL){

1625

1841

af = AF_INET6;

1842

/* Accept [] around IPv6 address - see RFC 5952 */

1843

if(connect_to[0] == '[' and address[-1] == ']')

1844

{

1845

connect_to++;

1846

address[-1] = '\0';

1847

}

1626

1848

} else {

1627

1849

af = AF_INET;

1628

1850

}

1851

address = connect_to;

1629

1852

1630

1853

if(quit_now){

1631

1854

goto end;

1632

1855

}

1633

1856

1634

1857

while(not quit_now){

1635

1858

ret = start_mandos_communication(address, port, if_index, af);

1636

1859

if(quit_now or ret == 0){

1637

1860

break;

1638

1861

}

1639

sleep(15);

1640

};

1641

1862

if(debug){

1863

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

1864

(int)retry_interval);

1865

}

1866

sleep((int)retry_interval);

1867

}

1868

1642

1869

if (not quit_now){

1643

1870

exitcode = EXIT_SUCCESS;

1644

1871

}

1700

1927

if(debug){

1701

1928

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

1702

1929

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

1933

if(debug){

1934

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

1935

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

1936

}

1705

1937

1706

1938

end:

1707

1939

1728

1960

if(gpgme_initialized){

1729

1961

gpgme_release(mc.ctx);

1730

1962

}

1963

1964

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

1965

has seen */

1966

if(mc.current_server != NULL){

1967

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

1968

while(mc.current_server != NULL){

1969

server *next = mc.current_server->next;

1970

free(mc.current_server);

1971

mc.current_server = next;

1972

}

1973

}

1731

1974

1732

1975

/* Take down the network interface */

1733

1976

if(take_down_interface){

1735

1978

errno = 0;

1736

1979

ret = seteuid(0);

1737

1980

if(ret == -1){

1738

perror("seteuid");

1981

perror_plus("seteuid");

1739

1982

}

1740

1983

if(geteuid() == 0){

1741

1984

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

1742

1985

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1986

perror_plus("ioctl SIOCGIFFLAGS");

1744

1987

} else if(network.ifr_flags & IFF_UP) {

1745

1988

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

1746

1989

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

1747

1990

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

1992

}

1750

1993

}

1751

1994

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

1752

1995

if(ret == -1){

1753

perror("close");

1996

perror_plus("close");

1754

1997

}

1755

1998

/* Lower privileges permanently */

1756

1999

errno = 0;

1757

2000

ret = setuid(uid);

1758

2001

if(ret == -1){

1759

perror("setuid");

2002

perror_plus("setuid");

1760

2003

}

1761

2004

}

1762

2005

}

1763

2006

1764

/* Removes the temp directory used by GPGME */

2007

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

1765

2008

if(tempdir_created){

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

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

1782

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

1783

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

1784

continue;

1785

}

2009

struct dirent **direntries = NULL;

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

1786

2016

char *fullname = NULL;

1787

2017

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

1788

2018

direntry->d_name);

1789

2019

if(ret < 0){

1790

perror("asprintf");

2020

perror_plus("asprintf");

1791

2021

continue;

1792

2022

}

1793

2023

ret = remove(fullname);

1797

2027

}

1798

2028

free(fullname);

1799

2029

}

1800

closedir(d);

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

1801

2036

}

1802

2037

ret = rmdir(tempdir);

1803

2038

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

1804

perror("rmdir");

2039

perror_plus("rmdir");

1805

2040

}

1806

2041

}

1807

2042

1812

2047

&old_sigterm_action,

1813

2048

NULL));

1814

2049

if(ret == -1){

1815

perror("sigaction");

2050

perror_plus("sigaction");

1816

2051

}

1817

2052

do {

1818

2053

ret = raise(signal_received);

1819

2054

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

1820

2055

if(ret != 0){

1821

perror("raise");

2056

perror_plus("raise");

1822

2057

abort();

1823

2058

}

1824

2059

TEMP_FAILURE_RETRY(pause());