/mandos/trunk : revision 237.4.2

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

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

}

1092

1032

int good_interface(const struct dirent *if_entry){

1093

1033

ssize_t ssret;

1094

1034

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

1035

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

1099

1036

if_entry->d_name);

1100

1037

if(ret < 0){

1101

perror_plus("asprintf");

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

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");

1107

free(flagname);

1046

perror("open");

1108

1047

return 0;

1109

1048

}

1110

free(flagname);

1111

1049

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

1112

1050

/* read line from flags_fd */

1113

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

1051

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

1114

1052

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

1115

1053

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

1116

1054

if(flagstring == NULL){

1117

perror_plus("malloc");

1055

perror("malloc");

1118

1056

close(flags_fd);

1119

1057

return 0;

1120

1058

}

1122

1060

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

1123

1061

(size_t)to_read));

1124

1062

if(ssret == -1){

1125

perror_plus("read");

1063

perror("read");

1126

1064

free(flagstring);

1127

1065

close(flags_fd);

1128

1066

return 0;

1173

1111

}

1174

1112

return 0;

1175

1113

}

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

1114

/* Accept this device */

1185

1115

if(debug){

1186

1116

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

1189

1119

return 1;

1190

1120

}

1191

1121

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

1122

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

1275

1123

AvahiSServiceBrowser *sb = NULL;

1276

1124

int error;

1293

1141

bool gnutls_initialized = false;

1294

1142

bool gpgme_initialized = false;

1295

1143

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

1144

1299

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1300

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1306

1152

errno = 0;

1307

1153

ret = setgid(gid);

1308

1154

if(ret == -1){

1309

perror_plus("setgid");

1155

perror("setgid");

1310

1156

}

1311

1157

1312

1158

/* Lower user privileges (temporarily) */

1313

1159

errno = 0;

1314

1160

ret = seteuid(uid);

1315

1161

if(ret == -1){

1316

perror_plus("seteuid");

1162

perror("seteuid");

1317

1163

}

1318

1164

1319

1165

if(quit_now){

1354

1200

.arg = "SECONDS",

1355

1201

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

1356

1202

.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

1203

/*

1362

1204

* These reproduce what we would get without ARGP_NO_HELP

1363

1205

*/

1407

1249

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

1408

1250

argp_error(state, "Bad delay");

1409

1251

}

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

1252

break;

1418

1253

/*

1419

1254

* These reproduce what we would get without ARGP_NO_HELP

1447

1282

case ENOMEM:

1448

1283

default:

1449

1284

errno = ret;

1450

perror_plus("argp_parse");

1285

perror("argp_parse");

1451

1286

exitcode = EX_OSERR;

1452

1287

goto end;

1453

1288

case EINVAL:

1471

1306

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

1472

1307

}

1473

1308

if(interface == NULL){

1474

perror_plus("malloc");

1309

perror("malloc");

1475

1310

free(direntries);

1476

1311

exitcode = EXIT_FAILURE;

1477

1312

goto end;

1499

1334

sigemptyset(&sigterm_action.sa_mask);

1500

1335

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

1501

1336

if(ret == -1){

1502

perror_plus("sigaddset");

1337

perror("sigaddset");

1503

1338

exitcode = EX_OSERR;

1504

1339

goto end;

1505

1340

}

1506

1341

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

1507

1342

if(ret == -1){

1508

perror_plus("sigaddset");

1343

perror("sigaddset");

1509

1344

exitcode = EX_OSERR;

1510

1345

goto end;

1511

1346

}

1512

1347

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

1513

1348

if(ret == -1){

1514

perror_plus("sigaddset");

1349

perror("sigaddset");

1515

1350

exitcode = EX_OSERR;

1516

1351

goto end;

1517

1352

}

1521

1356

*/

1522

1357

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

1523

1358

if(ret == -1){

1524

perror_plus("sigaction");

1359

perror("sigaction");

1525

1360

return EX_OSERR;

1526

1361

}

1527

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1528

1363

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

1529

1364

if(ret == -1){

1530

perror_plus("sigaction");

1365

perror("sigaction");

1531

1366

exitcode = EX_OSERR;

1532

1367

goto end;

1533

1368

}

1534

1369

}

1535

1370

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

1536

1371

if(ret == -1){

1537

perror_plus("sigaction");

1372

perror("sigaction");

1538

1373

return EX_OSERR;

1539

1374

}

1540

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1541

1376

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

1542

1377

if(ret == -1){

1543

perror_plus("sigaction");

1378

perror("sigaction");

1544

1379

exitcode = EX_OSERR;

1545

1380

goto end;

1546

1381

}

1547

1382

}

1548

1383

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

1549

1384

if(ret == -1){

1550

perror_plus("sigaction");

1385

perror("sigaction");

1551

1386

return EX_OSERR;

1552

1387

}

1553

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1554

1389

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

1555

1390

if(ret == -1){

1556

perror_plus("sigaction");

1391

perror("sigaction");

1557

1392

exitcode = EX_OSERR;

1558

1393

goto end;

1559

1394

}

1576

1411

errno = 0;

1577

1412

ret = seteuid(0);

1578

1413

if(ret == -1){

1579

perror_plus("seteuid");

1414

perror("seteuid");

1580

1415

}

1581

1416

1582

1417

#ifdef __linux__

1586

1421

bool restore_loglevel = true;

1587

1422

if(ret == -1){

1588

1423

restore_loglevel = false;

1589

perror_plus("klogctl");

1424

perror("klogctl");

1590

1425

}

1591

1426

#endif /* __linux__ */

1592

1427

1593

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

1429

if(sd < 0){

1595

perror_plus("socket");

1430

perror("socket");

1596

1431

exitcode = EX_OSERR;

1597

1432

#ifdef __linux__

1598

1433

if(restore_loglevel){

1599

1434

ret = klogctl(7, NULL, 0);

1600

1435

if(ret == -1){

1601

perror_plus("klogctl");

1436

perror("klogctl");

1602

1437

}

1603

1438

}

1604

1439

#endif /* __linux__ */

1606

1441

errno = 0;

1607

1442

ret = seteuid(uid);

1608

1443

if(ret == -1){

1609

perror_plus("seteuid");

1444

perror("seteuid");

1610

1445

}

1611

1446

goto end;

1612

1447

}

1613

1448

strcpy(network.ifr_name, interface);

1614

1449

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

1615

1450

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1617

1452

#ifdef __linux__

1618

1453

if(restore_loglevel){

1619

1454

ret = klogctl(7, NULL, 0);

1620

1455

if(ret == -1){

1621

perror_plus("klogctl");

1456

perror("klogctl");

1622

1457

}

1623

1458

}

1624

1459

#endif /* __linux__ */

1627

1462

errno = 0;

1628

1463

ret = seteuid(uid);

1629

1464

if(ret == -1){

1630

perror_plus("seteuid");

1465

perror("seteuid");

1631

1466

}

1632

1467

goto end;

1633

1468

}

1637

1472

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

1638

1473

if(ret == -1){

1639

1474

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1641

1476

exitcode = EX_OSERR;

1642

1477

#ifdef __linux__

1643

1478

if(restore_loglevel){

1644

1479

ret = klogctl(7, NULL, 0);

1645

1480

if(ret == -1){

1646

perror_plus("klogctl");

1481

perror("klogctl");

1647

1482

}

1648

1483

}

1649

1484

#endif /* __linux__ */

1651

1486

errno = 0;

1652

1487

ret = seteuid(uid);

1653

1488

if(ret == -1){

1654

perror_plus("seteuid");

1489

perror("seteuid");

1655

1490

}

1656

1491

goto end;

1657

1492

}

1658

1493

}

1659

/* Sleep checking until interface is running.

1660

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

1494

/* sleep checking until interface is running */

1661

1495

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

1662

1496

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

1663

1497

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1665

1499

} else if(network.ifr_flags & IFF_RUNNING){

1666

1500

break;

1667

1501

}

1668

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

1503

ret = nanosleep(&sleeptime, NULL);

1670

1504

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

1671

perror_plus("nanosleep");

1505

perror("nanosleep");

1672

1506

}

1673

1507

}

1674

1508

if(not take_down_interface){

1675

1509

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

1676

1510

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

1677

1511

if(ret == -1){

1678

perror_plus("close");

1512

perror("close");

1679

1513

}

1680

1514

}

1681

1515

#ifdef __linux__

1683

1517

/* Restores kernel loglevel to default */

1684

1518

ret = klogctl(7, NULL, 0);

1685

1519

if(ret == -1){

1686

perror_plus("klogctl");

1520

perror("klogctl");

1687

1521

}

1688

1522

}

1689

1523

#endif /* __linux__ */

1693

1527

/* Lower privileges */

1694

1528

ret = seteuid(uid);

1695

1529

if(ret == -1){

1696

perror_plus("seteuid");

1530

perror("seteuid");

1697

1531

}

1698

1532

} else {

1699

1533

/* Lower privileges permanently */

1700

1534

ret = setuid(uid);

1701

1535

if(ret == -1){

1702

perror_plus("setuid");

1536

perror("setuid");

1703

1537

}

1704

1538

}

1705

1539

}

1721

1555

goto end;

1722

1556

}

1723

1557

1558

tempdir_created = true;

1724

1559

if(mkdtemp(tempdir) == NULL){

1725

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

1726

1562

goto end;

1727

1563

}

1728

tempdir_created = true;

1729

1564

1730

1565

if(quit_now){

1731

1566

goto end;

1791

1626

if(quit_now or ret == 0){

1792

1627

break;

1793

1628

}

1794

sleep((int)retry_interval or 1);

1629

sleep(15);

1795

1630

};

1796

1631

1797

1632

if (not quit_now){

1855

1690

if(debug){

1856

1691

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

1857

1692

}

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

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

1865

1695

1866

1696

end:

1867

1697

1888

1718

if(gpgme_initialized){

1889

1719

gpgme_release(mc.ctx);

1890

1720

}

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

1721

1903

1722

/* Take down the network interface */

1904

1723

if(take_down_interface){

1906

1725

errno = 0;

1907

1726

ret = seteuid(0);

1908

1727

if(ret == -1){

1909

perror_plus("seteuid");

1728

perror("seteuid");

1910

1729

}

1911

1730

if(geteuid() == 0){

1912

1731

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

1913

1732

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1733

perror("ioctl SIOCGIFFLAGS");

1915

1734

} else if(network.ifr_flags & IFF_UP) {

1916

1735

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

1917

1736

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

1918

1737

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1920

1739

}

1921

1740

}

1922

1741

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

1923

1742

if(ret == -1){

1924

perror_plus("close");

1743

perror("close");

1925

1744

}

1926

1745

/* Lower privileges permanently */

1927

1746

errno = 0;

1928

1747

ret = setuid(uid);

1929

1748

if(ret == -1){

1930

perror_plus("setuid");

1749

perror("setuid");

1931

1750

}

1932

1751

}

1933

1752

}

1934

1753

1935

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

1754

/* Removes the temp directory used by GPGME */

1936

1755

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];

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

1943

1776

char *fullname = NULL;

1944

1777

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

1945

1778

direntry->d_name);

1946

1779

if(ret < 0){

1947

perror_plus("asprintf");

1780

perror("asprintf");

1948

1781

continue;

1949

1782

}

1950

1783

ret = remove(fullname);

1954

1787

}

1955

1788

free(fullname);

1956

1789

}

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");

1790

closedir(d);

1964

1791

}

1965

1792

ret = rmdir(tempdir);

1966

1793

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

1967

perror_plus("rmdir");

1794

perror("rmdir");

1968

1795

}

1969

1796

}

1970

1797

1975

1802

&old_sigterm_action,

1976

1803

NULL));

1977

1804

if(ret == -1){

1978

perror_plus("sigaction");

1805

perror("sigaction");

1979

1806

}

1980

1807

do {

1981

1808

ret = raise(signal_received);

1982

1809

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

1983

1810

if(ret != 0){

1984

perror_plus("raise");

1811

perror("raise");

1985

1812

abort();

1986

1813

}

1987

1814

TEMP_FAILURE_RETRY(pause());