/mandos/trunk : revision 485

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

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

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

}

423

481

}

424

482

425

483

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

485

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

486

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

432

487

safer_gnutls_strerror(ret));

433

488

gnutls_global_deinit();

434

489

return -1;

589

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

645

if(tcp_sd < 0){

591

646

int e = errno;

592

perror("socket");

647

perror_plus("socket");

593

648

errno = e;

594

649

goto mandos_end;

595

650

}

609

664

}

610

665

if(ret < 0 ){

611

666

int e = errno;

612

perror("inet_pton");

667

perror_plus("inet_pton");

613

668

errno = e;

614

669

goto mandos_end;

615

670

}

651

706

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

652

707

char interface[IF_NAMESIZE];

653

708

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

654

perror("if_indextoname");

709

perror_plus("if_indextoname");

655

710

} else {

656

711

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

657

712

ip, interface, port);

671

726

sizeof(addrstr));

672

727

}

673

728

if(pcret == NULL){

674

perror("inet_ntop");

729

perror_plus("inet_ntop");

675

730

} else {

676

731

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

677

732

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

690

745

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

691

746

}

692

747

if(ret < 0){

693

int e = errno;

694

perror("connect");

695

errno = e;

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

696

753

goto mandos_end;

697

754

}

698

755

709

766

out_size - written));

710

767

if(ret == -1){

711

768

int e = errno;

712

perror("write");

769

perror_plus("write");

713

770

errno = e;

714

771

goto mandos_end;

715

772

}

740

797

goto mandos_end;

741

798

}

742

799

800

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

743

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

744

802

745

803

if(quit_now){

782

840

buffer_capacity);

783

841

if(buffer_capacity == 0){

784

842

int e = errno;

785

perror("incbuffer");

843

perror_plus("incbuffer");

786

844

errno = e;

787

845

goto mandos_end;

788

846

}

893

951

if(e == 0){

894

952

e = errno;

895

953

}

896

perror("close");

954

perror_plus("close");

897

955

}

898

956

gnutls_deinit(session);

957

errno = e;

899

958

if(quit_now){

900

e = EINTR;

959

errno = EINTR;

901

960

retval = -1;

902

961

}

903

errno = e;

904

962

}

905

963

return retval;

906

964

}

949

1007

avahi_proto_to_af(proto));

950

1008

if(ret == 0){

951

1009

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

952

1013

}

953

1014

}

954

1015

}

1008

1069

}

1009

1070

}

1010

1071

1011

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

1072

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

1012

1073

static void handle_sigterm(int sig){

1013

1074

if(quit_now){

1014

1075

return;

1016

1077

quit_now = 1;

1017

1078

signal_received = sig;

1018

1079

int old_errno = errno;

1080

/* set main loop to exit */

1019

1081

if(mc.simple_poll != NULL){

1020

1082

avahi_simple_poll_quit(mc.simple_poll);

1021

1083

}

1030

1092

int good_interface(const struct dirent *if_entry){

1031

1093

ssize_t ssret;

1032

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1033

1098

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

1034

1099

if_entry->d_name);

1035

1100

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1101

perror_plus("asprintf");

1040

1102

return 0;

1041

1103

}

1042

1104

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

1043

1105

if(flags_fd == -1){

1044

perror("open");

1106

perror_plus("open");

1107

free(flagname);

1045

1108

return 0;

1046

1109

}

1110

free(flagname);

1047

1111

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

1048

1112

/* read line from flags_fd */

1049

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

1113

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

1050

1114

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

1051

1115

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

1052

1116

if(flagstring == NULL){

1053

perror("malloc");

1117

perror_plus("malloc");

1054

1118

close(flags_fd);

1055

1119

return 0;

1056

1120

}

1058

1122

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

1059

1123

(size_t)to_read));

1060

1124

if(ssret == -1){

1061

perror("read");

1125

perror_plus("read");

1062

1126

free(flagstring);

1063

1127

close(flags_fd);

1064

1128

return 0;

1109

1173

}

1110

1174

return 0;

1111

1175

}

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

}

1112

1184

/* Accept this device */

1113

1185

if(debug){

1114

1186

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

1117

1189

return 1;

1118

1190

}

1119

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

1120

1274

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

1121

1275

AvahiSServiceBrowser *sb = NULL;

1122

1276

int error;

1139

1293

bool gnutls_initialized = false;

1140

1294

bool gpgme_initialized = false;

1141

1295

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1142

1298

1143

1299

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1144

1300

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1150

1306

errno = 0;

1151

1307

ret = setgid(gid);

1152

1308

if(ret == -1){

1153

perror("setgid");

1309

perror_plus("setgid");

1154

1310

}

1155

1311

1156

1312

/* Lower user privileges (temporarily) */

1157

1313

errno = 0;

1158

1314

ret = seteuid(uid);

1159

1315

if(ret == -1){

1160

perror("seteuid");

1316

perror_plus("seteuid");

1161

1317

}

1162

1318

1163

1319

if(quit_now){

1198

1354

.arg = "SECONDS",

1199

1355

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

1200

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 },

1201

1361

/*

1202

1362

* These reproduce what we would get without ARGP_NO_HELP

1203

1363

*/

1247

1407

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

1248

1408

argp_error(state, "Bad delay");

1249

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

}

1250

1417

break;

1251

1418

/*

1252

1419

* These reproduce what we would get without ARGP_NO_HELP

1280

1447

case ENOMEM:

1281

1448

default:

1282

1449

errno = ret;

1283

perror("argp_parse");

1450

perror_plus("argp_parse");

1284

1451

exitcode = EX_OSERR;

1285

1452

goto end;

1286

1453

case EINVAL:

1304

1471

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

1305

1472

}

1306

1473

if(interface == NULL){

1307

perror("malloc");

1474

perror_plus("malloc");

1308

1475

free(direntries);

1309

1476

exitcode = EXIT_FAILURE;

1310

1477

goto end;

1332

1499

sigemptyset(&sigterm_action.sa_mask);

1333

1500

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

1334

1501

if(ret == -1){

1335

perror("sigaddset");

1502

perror_plus("sigaddset");

1336

1503

exitcode = EX_OSERR;

1337

1504

goto end;

1338

1505

}

1339

1506

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

1340

1507

if(ret == -1){

1341

perror("sigaddset");

1508

perror_plus("sigaddset");

1342

1509

exitcode = EX_OSERR;

1343

1510

goto end;

1344

1511

}

1345

1512

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

1346

1513

if(ret == -1){

1347

perror("sigaddset");

1514

perror_plus("sigaddset");

1348

1515

exitcode = EX_OSERR;

1349

1516

goto end;

1350

1517

}

1354

1521

*/

1355

1522

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

1356

1523

if(ret == -1){

1357

perror("sigaction");

1524

perror_plus("sigaction");

1358

1525

return EX_OSERR;

1359

1526

}

1360

1527

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

1528

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

1362

1529

if(ret == -1){

1363

perror("sigaction");

1530

perror_plus("sigaction");

1364

1531

exitcode = EX_OSERR;

1365

1532

goto end;

1366

1533

}

1367

1534

}

1368

1535

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

1369

1536

if(ret == -1){

1370

perror("sigaction");

1537

perror_plus("sigaction");

1371

1538

return EX_OSERR;

1372

1539

}

1373

1540

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

1541

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

1375

1542

if(ret == -1){

1376

perror("sigaction");

1543

perror_plus("sigaction");

1377

1544

exitcode = EX_OSERR;

1378

1545

goto end;

1379

1546

}

1380

1547

}

1381

1548

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

1382

1549

if(ret == -1){

1383

perror("sigaction");

1550

perror_plus("sigaction");

1384

1551

return EX_OSERR;

1385

1552

}

1386

1553

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

1554

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

1388

1555

if(ret == -1){

1389

perror("sigaction");

1556

perror_plus("sigaction");

1390

1557

exitcode = EX_OSERR;

1391

1558

goto end;

1392

1559

}

1409

1576

errno = 0;

1410

1577

ret = seteuid(0);

1411

1578

if(ret == -1){

1412

perror("seteuid");

1579

perror_plus("seteuid");

1413

1580

}

1414

1581

1415

1582

#ifdef __linux__

1419

1586

bool restore_loglevel = true;

1420

1587

if(ret == -1){

1421

1588

restore_loglevel = false;

1422

perror("klogctl");

1589

perror_plus("klogctl");

1423

1590

}

1424

1591

#endif /* __linux__ */

1425

1592

1426

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1427

1594

if(sd < 0){

1428

perror("socket");

1595

perror_plus("socket");

1429

1596

exitcode = EX_OSERR;

1430

1597

#ifdef __linux__

1431

1598

if(restore_loglevel){

1432

1599

ret = klogctl(7, NULL, 0);

1433

1600

if(ret == -1){

1434

perror("klogctl");

1601

perror_plus("klogctl");

1435

1602

}

1436

1603

}

1437

1604

#endif /* __linux__ */

1439

1606

errno = 0;

1440

1607

ret = seteuid(uid);

1441

1608

if(ret == -1){

1442

perror("seteuid");

1609

perror_plus("seteuid");

1443

1610

}

1444

1611

goto end;

1445

1612

}

1446

1613

strcpy(network.ifr_name, interface);

1447

1614

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

1448

1615

if(ret == -1){

1449

perror("ioctl SIOCGIFFLAGS");

1616

perror_plus("ioctl SIOCGIFFLAGS");

1450

1617

#ifdef __linux__

1451

1618

if(restore_loglevel){

1452

1619

ret = klogctl(7, NULL, 0);

1453

1620

if(ret == -1){

1454

perror("klogctl");

1621

perror_plus("klogctl");

1455

1622

}

1456

1623

}

1457

1624

#endif /* __linux__ */

1460

1627

errno = 0;

1461

1628

ret = seteuid(uid);

1462

1629

if(ret == -1){

1463

perror("seteuid");

1630

perror_plus("seteuid");

1464

1631

}

1465

1632

goto end;

1466

1633

}

1470

1637

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

1471

1638

if(ret == -1){

1472

1639

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1474

1641

exitcode = EX_OSERR;

1475

1642

#ifdef __linux__

1476

1643

if(restore_loglevel){

1477

1644

ret = klogctl(7, NULL, 0);

1478

1645

if(ret == -1){

1479

perror("klogctl");

1646

perror_plus("klogctl");

1480

1647

}

1481

1648

}

1482

1649

#endif /* __linux__ */

1484

1651

errno = 0;

1485

1652

ret = seteuid(uid);

1486

1653

if(ret == -1){

1487

perror("seteuid");

1654

perror_plus("seteuid");

1488

1655

}

1489

1656

goto end;

1490

1657

}

1491

1658

}

1492

/* sleep checking until interface is running */

1659

/* Sleep checking until interface is running.

1660

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

1493

1661

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

1494

1662

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

1495

1663

if(ret == -1){

1496

perror("ioctl SIOCGIFFLAGS");

1664

perror_plus("ioctl SIOCGIFFLAGS");

1497

1665

} else if(network.ifr_flags & IFF_RUNNING){

1498

1666

break;

1499

1667

}

1500

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1501

1669

ret = nanosleep(&sleeptime, NULL);

1502

1670

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

1503

perror("nanosleep");

1671

perror_plus("nanosleep");

1504

1672

}

1505

1673

}

1506

1674

if(not take_down_interface){

1507

1675

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

1508

1676

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

1509

1677

if(ret == -1){

1510

perror("close");

1678

perror_plus("close");

1511

1679

}

1512

1680

}

1513

1681

#ifdef __linux__

1515

1683

/* Restores kernel loglevel to default */

1516

1684

ret = klogctl(7, NULL, 0);

1517

1685

if(ret == -1){

1518

perror("klogctl");

1686

perror_plus("klogctl");

1519

1687

}

1520

1688

}

1521

1689

#endif /* __linux__ */

1525

1693

/* Lower privileges */

1526

1694

ret = seteuid(uid);

1527

1695

if(ret == -1){

1528

perror("seteuid");

1696

perror_plus("seteuid");

1529

1697

}

1530

1698

} else {

1531

1699

/* Lower privileges permanently */

1532

1700

ret = setuid(uid);

1533

1701

if(ret == -1){

1534

perror("setuid");

1702

perror_plus("setuid");

1535

1703

}

1536

1704

}

1537

1705

}

1553

1721

goto end;

1554

1722

}

1555

1723

1724

if(mkdtemp(tempdir) == NULL){

1725

perror_plus("mkdtemp");

1726

goto end;

1727

}

1556

1728

tempdir_created = true;

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1559

perror("mkdtemp");

1560

goto end;

1561

}

1562

1729

1563

1730

if(quit_now){

1564

1731

goto end;

1618

1785

if(quit_now){

1619

1786

goto end;

1620

1787

}

1621

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1788

1789

while(not quit_now){

1790

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

1791

if(quit_now or ret == 0){

1641

1792

break;

1642

1793

}

1643

} else {

1794

sleep((int)retry_interval or 1);

1795

};

1796

1797

if (not quit_now){

1644

1798

exitcode = EXIT_SUCCESS;

1645

1799

}

1800

1646

1801

goto end;

1647

1802

}

1648

1803

1700

1855

if(debug){

1701

1856

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

1702

1857

}

1703

1704

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

}

1705

1865

1706

1866

end:

1707

1867

1728

1888

if(gpgme_initialized){

1729

1889

gpgme_release(mc.ctx);

1730

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

}

1731

1902

1732

1903

/* Take down the network interface */

1733

1904

if(take_down_interface){

1735

1906

errno = 0;

1736

1907

ret = seteuid(0);

1737

1908

if(ret == -1){

1738

perror("seteuid");

1909

perror_plus("seteuid");

1739

1910

}

1740

1911

if(geteuid() == 0){

1741

1912

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

1742

1913

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1914

perror_plus("ioctl SIOCGIFFLAGS");

1744

1915

} else if(network.ifr_flags & IFF_UP) {

1745

1916

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

1746

1917

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

1747

1918

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

1920

}

1750

1921

}

1751

1922

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

1752

1923

if(ret == -1){

1753

perror("close");

1924

perror_plus("close");

1754

1925

}

1755

1926

/* Lower privileges permanently */

1756

1927

errno = 0;

1757

1928

ret = setuid(uid);

1758

1929

if(ret == -1){

1759

perror("setuid");

1930

perror_plus("setuid");

1760

1931

}

1761

1932

}

1762

1933

}

1763

1934

1764

/* Removes the temp directory used by GPGME */

1935

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

1765

1936

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

}

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];

1786

1943

char *fullname = NULL;

1787

1944

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

1788

1945

direntry->d_name);

1789

1946

if(ret < 0){

1790

perror("asprintf");

1947

perror_plus("asprintf");

1791

1948

continue;

1792

1949

}

1793

1950

ret = remove(fullname);

1797

1954

}

1798

1955

free(fullname);

1799

1956

}

1800

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");

1801

1964

}

1802

1965

ret = rmdir(tempdir);

1803

1966

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

1804

perror("rmdir");

1967

perror_plus("rmdir");

1805

1968

}

1806

1969

}

1807

1970

1812

1975

&old_sigterm_action,

1813

1976

NULL));

1814

1977

if(ret == -1){

1815

perror("sigaction");

1978

perror_plus("sigaction");

1816

1979

}

1817

1980

do {

1818

1981

ret = raise(signal_received);

1819

1982

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

1820

1983

if(ret != 0){

1821

perror("raise");

1984

perror_plus("raise");

1822

1985

abort();

1823

1986

}

1824

1987

TEMP_FAILURE_RETRY(pause());