/mandos/trunk : revision 690

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

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

#include <fcntl.h> /* open() */

60

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

62

*/

73

74

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

74

75

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

75

76

setgid(), pause(), _exit() */

76

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

77

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

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,

91

92

argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

94

argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

96

EAI_SYSTEM, gai_strerror() */

94

97

95

98

#ifdef __linux__

96

99

#include <sys/klog.h> /* klogctl() */

180

183

perror(print_text);

181

184

}

182

185

183

__attribute__((format (gnu_printf, 2, 3)))

186

__attribute__((format (gnu_printf, 2, 3), nonnull))

184

187

int fprintf_plus(FILE *stream, const char *format, ...){

185

188

va_list ap;

186

189

va_start (ap, format);

187

190

188

191

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

189

192

program_invocation_short_name));

190

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

193

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

191

194

}

192

195

193

196

/*

195

198

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

196

199

* "buffer_length" is how much is already used.

197

200

*/

201

__attribute__((nonnull, warn_unused_result))

198

202

size_t incbuffer(char **buffer, size_t buffer_length,

199

203

size_t buffer_capacity){

200

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

205

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

203

211

return 0;

204

212

}

213

*buffer = new_buf;

205

214

buffer_capacity += BUFFER_SIZE;

206

215

}

207

216

return buffer_capacity;

208

217

}

209

218

210

219

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

220

__attribute__((nonnull, warn_unused_result))

211

221

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

212

222

int af, server **current_server){

213

223

int ret;

224

234

perror_plus("strdup");

225

235

return false;

226

236

}

237

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

227

242

/* Special case of first server */

228

243

if(*current_server == NULL){

229

244

new_server->next = new_server;

230

245

new_server->prev = new_server;

231

246

*current_server = new_server;

232

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

233

247

} else {

248

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

234

249

new_server->next = *current_server;

235

250

new_server->prev = (*current_server)->prev;

236

251

new_server->prev->next = new_server;

237

252

(*current_server)->prev = new_server;

238

253

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

254

return true;

245

255

}

246

256

247

257

/*

248

258

* Initialize GPGME.

249

259

*/

250

static bool init_gpgme(const char *seckey, const char *pubkey,

251

const char *tempdir, mandos_context *mc){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

252

265

gpgme_error_t rc;

253

266

gpgme_engine_info_t engine_info;

254

267

255

268

/*

256

269

* Helper function to insert pub and seckey to the engine keyring.

257

270

*/

258

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

259

272

int ret;

260

273

int fd;

261

274

gpgme_data_t pgp_data;

342

355

* Decrypt OpenPGP data.

343

356

* Returns -1 on error

344

357

*/

358

__attribute__((nonnull, warn_unused_result))

345

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

360

size_t crypto_size,

347

361

char **plaintext,

467

481

return plaintext_length;

468

482

}

469

483

470

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

471

486

const char *ret = gnutls_strerror(value);

472

487

if(ret == NULL)

473

488

ret = "(unknown)";

475

490

}

476

491

477

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

478

494

static void debuggnutls(__attribute__((unused)) int level,

479

495

const char* string){

480

496

fprintf_plus(stderr, "GnuTLS: %s", string);

481

497

}

482

498

499

__attribute__((nonnull, warn_unused_result))

483

500

static int init_gnutls_global(const char *pubkeyfilename,

484

501

const char *seckeyfilename,

485

502

mandos_context *mc){

559

576

return -1;

560

577

}

561

578

579

__attribute__((nonnull, warn_unused_result))

562

580

static int init_gnutls_session(gnutls_session_t *session,

563

581

mandos_context *mc){

564

582

int ret;

621

639

__attribute__((unused)) const char *txt){}

622

640

623

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

624

643

static int start_mandos_communication(const char *ip, in_port_t port,

625

644

AvahiIfIndex if_index,

626

645

int af, mandos_context *mc){

627

646

int ret, tcp_sd = -1;

628

647

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

648

struct sockaddr_storage to;

633

649

char *buffer = NULL;

634

650

char *decrypted_buffer = NULL;

635

651

size_t buffer_length = 0;

659

675

return -1;

660

676

}

661

677

678

/* If the interface is specified and we have a list of interfaces */

679

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

680

/* Check if the interface is one of the interfaces we are using */

681

bool match = false;

682

{

683

char *interface = NULL;

684

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

685

interface))){

686

if(if_nametoindex(interface) == (unsigned int)if_index){

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

/* This interface does not match any in the list, so we don't

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

fprintf_plus(stderr, "Skipping server on non-used interface"

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

662

710

ret = init_gnutls_session(&session, mc);

663

711

if(ret != 0){

664

712

return -1;

684

732

685

733

memset(&to, 0, sizeof(to));

686

734

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

ret = inet_pton(af, ip, &to.in6.sin6_addr);

735

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

736

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

689

737

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

ret = inet_pton(af, ip, &to.in.sin_addr);

738

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

739

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

692

740

}

693

741

if(ret < 0 ){

694

742

int e = errno;

703

751

goto mandos_end;

704

752

}

705

753

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

709

-Wunreachable-code*/

754

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

755

if(IN6_IS_ADDR_LINKLOCAL

756

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

710

757

if(if_index == AVAHI_IF_UNSPEC){

711

758

fprintf_plus(stderr, "An IPv6 link-local address is"

712

759

" incomplete without a network interface\n");

714

761

goto mandos_end;

715

762

}

716

763

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

764

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

718

765

}

719

766

} else {

720

to.in.sin_port = htons(port); /* Spurious warnings from

721

-Wconversion and

722

-Wunreachable-code */

767

((struct sockaddr_in *)&to)->sin_port = htons(port);

723

768

}

724

769

725

770

if(quit_now){

742

787

}

743

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

790

if(af == AF_INET6){

747

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

748

sizeof(addrstr));

791

ret = getnameinfo((struct sockaddr *)&to,

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

749

795

} else {

750

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

751

sizeof(addrstr));

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

752

800

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

805

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

806

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

759

807

}

760

808

}

761

809

765

813

}

766

814

767

815

if(af == AF_INET6){

768

ret = connect(tcp_sd, &to.in6, sizeof(to));

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

769

818

} else {

770

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

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

771

821

}

772

822

if(ret < 0){

773

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

823

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

774

824

int e = errno;

775

825

perror_plus("connect");

776

826

errno = e;

991

1041

return retval;

992

1042

}

993

1043

1044

__attribute__((nonnull))

994

1045

static void resolve_callback(AvahiSServiceResolver *r,

995

1046

AvahiIfIndex interface,

996

1047

AvahiProtocol proto,

1004

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1057

flags,

1007

void* mc){

1058

void *mc){

1008

1059

if(r == NULL){

1009

1060

return;

1010

1061

}

1063

1114

const char *domain,

1064

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1116

flags,

1066

void* mc){

1117

void *mc){

1067

1118

if(b == NULL){

1068

1119

return;

1069

1120

}

1129

1180

errno = old_errno;

1130

1181

}

1131

1182

1183

__attribute__((nonnull, warn_unused_result))

1132

1184

bool get_flags(const char *ifname, struct ifreq *ifr){

1133

1185

int ret;

1134

1186

error_t ret_errno;

1153

1205

return true;

1154

1206

}

1155

1207

1208

__attribute__((nonnull, warn_unused_result))

1156

1209

bool good_flags(const char *ifname, const struct ifreq *ifr){

1157

1210

1158

1211

/* Reject the loopback device */

1200

1253

* corresponds to an acceptable network device.

1201

1254

* (This function is passed to scandir(3) as a filter function.)

1202

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1203

1257

int good_interface(const struct dirent *if_entry){

1204

1258

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

1205

1259

return 0;

1223

1277

/*

1224

1278

* This function determines if a network interface is up.

1225

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1226

1281

bool interface_is_up(const char *interface){

1227

1282

struct ifreq ifr;

1228

1283

if(not get_flags(interface, &ifr)){

1239

1294

/*

1240

1295

* This function determines if a network interface is running

1241

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1242

1298

bool interface_is_running(const char *interface){

1243

1299

struct ifreq ifr;

1244

1300

if(not get_flags(interface, &ifr)){

1252

1308

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1253

1309

}

1254

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1255

1312

int notdotentries(const struct dirent *direntry){

1256

1313

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

1257

1314

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

1264

1321

}

1265

1322

1266

1323

/* Is this directory entry a runnable program? */

1324

__attribute__((nonnull, warn_unused_result))

1267

1325

int runnable_hook(const struct dirent *direntry){

1268

1326

int ret;

1269

1327

size_t sret;

1277

1335

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1278

1336

"abcdefghijklmnopqrstuvwxyz"

1279

1337

"0123456789"

1280

"_-");

1338

"_.-");

1281

1339

if((direntry->d_name)[sret] != '\0'){

1282

1340

/* Contains non-allowed characters */

1283

1341

if(debug){

1301

1359

}

1302

1360

return 0;

1303

1361

}

1362

free(fullname);

1304

1363

if(not (S_ISREG(st.st_mode))){

1305

1364

/* Not a regular file */

1306

1365

if(debug){

1324

1383

return 1;

1325

1384

}

1326

1385

1386

__attribute__((nonnull, warn_unused_result))

1327

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

1388

mandos_context *mc){

1329

1389

int ret;

1333

1393

1334

1394

while(true){

1335

1395

if(mc->current_server == NULL){

1336

if (debug){

1396

if(debug){

1337

1397

fprintf_plus(stderr, "Wait until first server is found."

1338

1398

" No timeout!\n");

1339

1399

}

1340

1400

ret = avahi_simple_poll_iterate(s, -1);

1341

1401

} else {

1342

if (debug){

1402

if(debug){

1343

1403

fprintf_plus(stderr, "Check current_server if we should run"

1344

1404

" it, or wait\n");

1345

1405

}

1362

1422

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

1363

1423

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

1364

1424

1365

if (debug){

1425

if(debug){

1366

1426

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1367

1427

block_time);

1368

1428

}

1390

1450

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

1391

1451

}

1392

1452

if(ret != 0){

1393

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

1453

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

1394

1454

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

1395

1455

}

1396

1456

}

1398

1458

}

1399

1459

1400

1460

/* Set effective uid to 0, return errno */

1461

__attribute__((warn_unused_result))

1401

1462

error_t raise_privileges(void){

1402

1463

error_t old_errno = errno;

1403

1464

error_t ret_errno = 0;

1410

1471

}

1411

1472

1412

1473

/* Set effective and real user ID to 0. Return errno. */

1474

__attribute__((warn_unused_result))

1413

1475

error_t raise_privileges_permanently(void){

1414

1476

error_t old_errno = errno;

1415

1477

error_t ret_errno = raise_privileges();

1426

1488

}

1427

1489

1428

1490

/* Set effective user ID to unprivileged saved user ID */

1491

__attribute__((warn_unused_result))

1429

1492

error_t lower_privileges(void){

1430

1493

error_t old_errno = errno;

1431

1494

error_t ret_errno = 0;

1438

1501

}

1439

1502

1440

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1441

1505

error_t lower_privileges_permanently(void){

1442

1506

error_t old_errno = errno;

1443

1507

error_t ret_errno = 0;

1449

1513

return ret_errno;

1450

1514

}

1451

1515

1452

bool run_network_hooks(const char *mode, const char *interface,

1516

__attribute__((nonnull))

1517

void run_network_hooks(const char *mode, const char *interface,

1453

1518

const float delay){

1454

1519

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1457

1520

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1458

1521

alphasort);

1459

1522

if(numhooks == -1){

1466

1529

perror_plus("scandir");

1467

1530

}

1468

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1469

1534

int devnull = open("/dev/null", O_RDONLY);

1470

1535

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

1471

1536

direntry = direntries[i];

1483

1548

if(hook_pid == 0){

1484

1549

/* Child */

1485

1550

/* Raise privileges */

1486

raise_privileges_permanently();

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1487

1555

/* Set group */

1488

1556

errno = 0;

1489

1557

ret = setgid(0);

1490

1558

if(ret == -1){

1491

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1492

1561

}

1493

1562

/* Reset supplementary groups */

1494

1563

errno = 0;

1495

1564

ret = setgroups(0, NULL);

1496

1565

if(ret == -1){

1497

1566

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

perror_plus("dup2(devnull, STDIN_FILENO)");

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1582

_exit(EX_OSERR);

1583

}

1502

1584

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1503

1585

if(ret == -1){

1504

1586

perror_plus("setenv");

1520

1602

_exit(EX_OSERR);

1521

1603

}

1522

1604

char *delaystring;

1523

ret = asprintf(&delaystring, "%f", delay);

1605

ret = asprintf(&delaystring, "%f", (double)delay);

1524

1606

if(ret == -1){

1525

1607

perror_plus("asprintf");

1526

1608

_exit(EX_OSERR);

1579

1661

}

1580

1662

close(devnull);

1581

1663

}

1582

return true;

1583

1664

}

1584

1665

1666

__attribute__((nonnull, warn_unused_result))

1585

1667

error_t bring_up_interface(const char *const interface,

1586

1668

const float delay){

1587

int sd = -1;

1588

1669

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1670

int ret;

1591

1671

struct ifreq network;

1592

1672

unsigned int if_index = if_nametoindex(interface);

1593

1673

if(if_index == 0){

1602

1682

}

1603

1683

1604

1684

if(not interface_is_up(interface)){

1605

if(not get_flags(interface, &network) and debug){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

if(not get_flags(interface, &network)){

1606

1687

ret_errno = errno;

1607

1688

fprintf_plus(stderr, "Failed to get flags for interface "

1608

1689

"\"%s\"\n", interface);

1690

errno = old_errno;

1609

1691

return ret_errno;

1610

1692

}

1611

network.ifr_flags |= IFF_UP;

1693

network.ifr_flags |= IFF_UP; /* set flag */

1612

1694

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1695

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1696

if(sd == -1){

1615

1697

ret_errno = errno;

1616

1698

perror_plus("socket");

1617

1699

errno = old_errno;

1618

1700

return ret_errno;

1619

1701

}

1620

1702

1621

1703

if(quit_now){

1622

close(sd);

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1623

1708

errno = old_errno;

1624

1709

return EINTR;

1625

1710

}

1629

1714

interface);

1630

1715

}

1631

1716

1632

/* Raise priviliges */

1633

raise_privileges();

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1634

1722

1635

1723

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

messages about the network interface to mess up the prompt */

1638

int ret_linux = klogctl(8, NULL, 5);

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

messages about the network interface to mess up the prompt */

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1643

1735

}

1644

1736

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1737

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1738

ioctl_errno = errno;

1647

1739

#ifdef __linux__

1648

1740

if(restore_loglevel){

1649

1741

ret_linux = klogctl(7, NULL, 0);

1653

1745

}

1654

1746

#endif /* __linux__ */

1655

1747

1656

/* Lower privileges */

1657

lower_privileges();

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1658

1757

1659

1758

/* Close the socket */

1660

1759

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

1663

1762

}

1664

1763

1665

1764

if(ret_setflags == -1){

1666

errno = ret_errno;

1765

errno = ioctl_errno;

1667

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

1767

errno = old_errno;

1669

return ret_errno;

1768

return ioctl_errno;

1670

1769

}

1671

1770

} else if(debug){

1672

1771

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1690

1789

return 0;

1691

1790

}

1692

1791

1792

__attribute__((nonnull, warn_unused_result))

1693

1793

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

1794

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

1795

struct ifreq network;

1699

1796

unsigned int if_index = if_nametoindex(interface);

1700

1797

if(if_index == 0){

1703

1800

return ENXIO;

1704

1801

}

1705

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1706

1804

if(not get_flags(interface, &network) and debug){

1707

1805

ret_errno = errno;

1708

1806

fprintf_plus(stderr, "Failed to get flags for interface "

1709

1807

"\"%s\"\n", interface);

1808

errno = old_errno;

1710

1809

return ret_errno;

1711

1810

}

1712

1811

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

1713

1812

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1813

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1814

if(sd == -1){

1716

1815

ret_errno = errno;

1717

1816

perror_plus("socket");

1718

1817

errno = old_errno;

1724

1823

interface);

1725

1824

}

1726

1825

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1735

1844

1736

1845

/* Close the socket */

1737

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

1846

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

1738

1847

if(ret == -1){

1739

1848

perror_plus("close");

1740

1849

}

1741

1850

1742

1851

if(ret_setflags == -1){

1743

errno = ret_errno;

1852

errno = ioctl_errno;

1744

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

1854

errno = old_errno;

1746

return ret_errno;

1855

return ioctl_errno;

1747

1856

}

1748

1857

} else if(debug){

1749

1858

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1757

1866

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

1758

1867

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1759

1868

.priority = "SECURE256:!CTYPE-X.509:"

1760

"+CTYPE-OPENPGP", .current_server = NULL,

1869

"+CTYPE-OPENPGP", .current_server = NULL,

1761

1870

.interfaces = NULL, .interfaces_size = 0 };

1762

1871

AvahiSServiceBrowser *sb = NULL;

1763

1872

error_t ret_errno;

1767

1876

int exitcode = EXIT_SUCCESS;

1768

1877

char *interfaces_to_take_down = NULL;

1769

1878

size_t interfaces_to_take_down_size = 0;

1770

char tempdir[] = "/tmp/mandosXXXXXX";

1771

bool tempdir_created = false;

1879

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1880

char old_tempdir[] = "/tmp/mandosXXXXXX";

1881

char *tempdir = NULL;

1772

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1883

const char *seckey = PATHDIR "/" SECKEY;

1774

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1775

1885

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1886

1778

1887

bool gnutls_initialized = false;

1779

1888

bool gpgme_initialized = false;

1957

2066

/* Work around Debian bug #633582:

1958

2067

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

1959

2068

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1962

2075

struct stat st;

1963

2076

1964

2077

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

2004

2117

}

2005

2118

2006

2119

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2011

2124

}

2012

2125

}

2013

2126

}

2014

2127

2015

/* Remove empty interface names */

2128

/* Remove invalid interface names (except "none") */

2016

2129

{

2017

2130

char *interface = NULL;

2018

2131

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2019

2132

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2133

if(strcmp(interface, "none") != 0

2134

and if_nametoindex(interface) == 0){

2135

if(interface[0] != '\0'){

2022

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2023

2137

" \"%s\"\n", interface);

2024

2138

}

2030

2144

2031

2145

/* Run network hooks */

2032

2146

{

2033

2034

2147

if(mc.interfaces != NULL){

2035

2148

interfaces_hooks = malloc(mc.interfaces_size);

2036

2149

if(interfaces_hooks == NULL){

2038

2151

goto end;

2039

2152

}

2040

2153

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2046

interfaces_hooks : "", delay)){

2047

goto end;

2048

}

2154

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2049

2158

}

2050

2159

2051

2160

if(not debug){

2139

2248

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2140

2249

direntries[i]->d_name);

2141

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2142

2252

perror_plus("argz_add");

2143

2253

continue;

2144

2254

}

2156

2266

}

2157

2267

}

2158

2268

2269

/* Bring up interfaces which are down, and remove any "none"s */

2270

{

2271

char *interface = NULL;

2272

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2273

interface))){

2274

/* If interface name is "none", stop bringing up interfaces.

2275

Also remove all instances of "none" from the list */

2276

if(strcmp(interface, "none") == 0){

2277

argz_delete(&mc.interfaces, &mc.interfaces_size,

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

if(strcmp(interface, "none") == 0){

2283

argz_delete(&mc.interfaces, &mc.interfaces_size,

2284

interface);

2285

interface = NULL;

2286

}

2287

}

2288

break;

2289

}

2290

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2292

if(not interface_was_up){

2293

if(errno != 0){

2294

perror_plus("Failed to bring up interface");

2295

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2302

}

2303

}

2304

}

2305

if(debug and (interfaces_to_take_down == NULL)){

2306

fprintf_plus(stderr, "No interfaces were brought up\n");

2307

}

2308

}

2309

2159

2310

/* If we only got one interface, explicitly use only that one */

2160

2311

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2161

2312

if(debug){

2165

2316

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2166

2317

}

2167

2318

2168

/* Bring up interfaces which are down */

2169

if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1

2170

and strcmp(mc.interfaces, "none") == 0)){

2171

char *interface = NULL;

2172

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

2185

}

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

if(debug and (interfaces_to_take_down == NULL)){

2191

fprintf_plus(stderr, "No interfaces were brought up\n");

2192

}

2193

}

2194

2195

2319

if(quit_now){

2196

2320

goto end;

2197

2321

}

2209

2333

goto end;

2210

2334

}

2211

2335

2212

if(mkdtemp(tempdir) == NULL){

2336

/* Try /run/tmp before /tmp */

2337

tempdir = mkdtemp(run_tempdir);

2338

if(tempdir == NULL and errno == ENOENT){

2339

if(debug){

2340

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2213

2346

perror_plus("mkdtemp");

2214

2347

goto end;

2215

2348

}

2216

tempdir_created = true;

2217

2349

2218

2350

if(quit_now){

2219

2351

goto end;

2255

2387

exitcode = EX_USAGE;

2256

2388

goto end;

2257

2389

}

2258

2390

2259

2391

if(quit_now){

2260

2392

goto end;

2261

2393

}

2291

2423

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

2292

2424

(int)retry_interval);

2293

2425

}

2294

sleep((int)retry_interval);

2426

sleep((unsigned int)retry_interval);

2295

2427

}

2296

2428

2297

if (not quit_now){

2429

if(not quit_now){

2298

2430

exitcode = EXIT_SUCCESS;

2299

2431

}

2300

2432

2355

2487

if(debug){

2356

2488

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

2357

2489

}

2358

2490

2359

2491

ret = avahi_loop_with_timeout(simple_poll,

2360

2492

(int)(retry_interval * 1000), &mc);

2361

2493

if(debug){

2370

2502

}

2371

2503

2372

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

2373

2507

if(sb != NULL)

2374

2508

avahi_s_service_browser_free(sb);

2375

2509

2400

2534

}

2401

2535

}

2402

2536

2403

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2404

2538

{

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

/* Take down the network interfaces which were brought up */

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

2421

}

2422

}

2423

if(debug and (interfaces_to_take_down == NULL)){

2424

fprintf_plus(stderr, "No interfaces needed to be taken"

2425

" down\n");

2426

}

2427

}

2428

2429

lower_privileges_permanently();

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

/* Take down the network interfaces which were brought up */

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

if(debug and (interfaces_to_take_down == NULL)){

2561

fprintf_plus(stderr, "No interfaces needed to be taken"

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

2430

2571

}

2431

2572

2432

2573

free(interfaces_to_take_down);

2433

2574

free(interfaces_hooks);

2434

2575

2435

2576

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

2436

if(tempdir_created){

2577

if(tempdir != NULL){

2437

2578

struct dirent **direntries = NULL;

2438

2579

struct dirent *direntry = NULL;

2439

2580

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

2440

2581

alphasort);

2441

if (numentries > 0){

2582

if(numentries > 0){

2442

2583

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

2443

2584

direntry = direntries[i];

2444

2585

char *fullname = NULL;

2456

2597

free(fullname);

2457

2598

}

2458

2599

}

2459

2600

2460

2601

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

2461

2602

free(direntries);

2462

if (numentries == -1){

2603

if(numentries == -1){

2463

2604

perror_plus("scandir");

2464

2605

}

2465

2606

ret = rmdir(tempdir);