/mandos/trunk : revision 603

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(),

59

getnameinfo() */

58

inet_pton(), connect() */

60

59

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

61

60

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

62

61

*/

74

73

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

75

74

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

76

75

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

77

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

76

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

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,

92

91

argz_delete(), argz_append(),

93

92

argz_stringify(), argz_add(),

94

93

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

97

94

98

95

#ifdef __linux__

99

96

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

183

180

perror(print_text);

184

181

}

185

182

186

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

183

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

187

184

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

188

185

va_list ap;

189

186

va_start (ap, format);

190

187

191

188

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

192

189

program_invocation_short_name));

193

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

190

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

194

191

}

195

192

196

193

/*

198

195

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

199

196

* "buffer_length" is how much is already used.

200

197

*/

201

__attribute__((nonnull, warn_unused_result))

202

198

size_t incbuffer(char **buffer, size_t buffer_length,

203

199

size_t buffer_capacity){

204

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

201

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

202

if(buffer == NULL){

211

203

return 0;

212

204

}

213

*buffer = new_buf;

214

205

buffer_capacity += BUFFER_SIZE;

215

206

}

216

207

return buffer_capacity;

217

208

}

218

209

219

210

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

220

__attribute__((nonnull, warn_unused_result))

221

211

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

222

212

int af, server **current_server){

223

213

int ret;

234

224

perror_plus("strdup");

235

225

return false;

236

226

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

227

/* Special case of first server */

243

228

if(*current_server == NULL){

244

229

new_server->next = new_server;

245

230

new_server->prev = new_server;

246

231

*current_server = new_server;

232

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

247

233

} else {

248

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

249

234

new_server->next = *current_server;

250

235

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

251

236

new_server->prev->next = new_server;

252

237

(*current_server)->prev = new_server;

253

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

254

244

return true;

255

245

}

256

246

257

247

/*

258

248

* Initialize GPGME.

259

249

*/

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){

250

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

251

const char *tempdir, mandos_context *mc){

265

252

gpgme_error_t rc;

266

253

gpgme_engine_info_t engine_info;

267

254

268

255

/*

269

256

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

270

257

*/

271

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

272

259

int ret;

273

260

int fd;

274

261

gpgme_data_t pgp_data;

355

342

* Decrypt OpenPGP data.

356

343

* Returns -1 on error

357

344

*/

358

__attribute__((nonnull, warn_unused_result))

359

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

346

size_t crypto_size,

361

347

char **plaintext,

481

467

return plaintext_length;

482

468

}

483

469

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

486

471

const char *ret = gnutls_strerror(value);

487

472

if(ret == NULL)

488

473

ret = "(unknown)";

490

475

}

491

476

492

477

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

478

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

495

479

const char* string){

496

480

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

497

481

}

498

482

499

__attribute__((nonnull, warn_unused_result))

500

483

static int init_gnutls_global(const char *pubkeyfilename,

501

484

const char *seckeyfilename,

502

485

mandos_context *mc){

576

559

return -1;

577

560

}

578

561

579

__attribute__((nonnull, warn_unused_result))

580

562

static int init_gnutls_session(gnutls_session_t *session,

581

563

mandos_context *mc){

582

564

int ret;

639

621

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

640

622

641

623

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

624

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

644

625

AvahiIfIndex if_index,

645

626

int af, mandos_context *mc){

646

627

int ret, tcp_sd = -1;

647

628

ssize_t sret;

648

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

649

633

char *buffer = NULL;

650

634

char *decrypted_buffer = NULL;

651

635

size_t buffer_length = 0;

675

659

return -1;

676

660

}

677

661

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

710

662

ret = init_gnutls_session(&session, mc);

711

663

if(ret != 0){

712

664

return -1;

732

684

733

685

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

734

686

if(af == AF_INET6){

735

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

736

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

687

to.in6.sin6_family = (sa_family_t)af;

688

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

737

689

} else { /* IPv4 */

738

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

739

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

690

to.in.sin_family = (sa_family_t)af;

691

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

740

692

}

741

693

if(ret < 0 ){

742

694

int e = errno;

751

703

goto mandos_end;

752

704

}

753

705

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

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*/

757

710

if(if_index == AVAHI_IF_UNSPEC){

758

711

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

759

712

" incomplete without a network interface\n");

761

714

goto mandos_end;

762

715

}

763

716

/* Set the network interface number as scope */

764

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

717

to.in6.sin6_scope_id = (uint32_t)if_index;

765

718

}

766

719

} else {

767

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

720

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

721

-Wconversion and

722

-Wunreachable-code */

768

723

}

769

724

770

725

if(quit_now){

787

742

}

788

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

790

746

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

747

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

748

sizeof(addrstr));

795

749

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

750

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

751

sizeof(addrstr));

800

752

}

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);

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

}

807

759

}

808

760

}

809

761

813

765

}

814

766

815

767

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

768

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

818

769

} else {

819

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

820

sizeof(struct sockaddr_in));

770

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

821

771

}

822

772

if(ret < 0){

823

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

773

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

824

774

int e = errno;

825

775

perror_plus("connect");

826

776

errno = e;

1041

991

return retval;

1042

992

}

1043

993

1044

__attribute__((nonnull))

1045

994

static void resolve_callback(AvahiSServiceResolver *r,

1046

995

AvahiIfIndex interface,

1047

996

AvahiProtocol proto,

1055

1004

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1006

flags,

1058

void *mc){

1007

void* mc){

1059

1008

if(r == NULL){

1060

1009

return;

1061

1010

}

1114

1063

const char *domain,

1115

1064

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1065

flags,

1117

void *mc){

1066

void* mc){

1118

1067

if(b == NULL){

1119

1068

return;

1120

1069

}

1180

1129

errno = old_errno;

1181

1130

}

1182

1131

1183

__attribute__((nonnull, warn_unused_result))

1184

1132

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

1185

1133

int ret;

1186

1134

error_t ret_errno;

1205

1153

return true;

1206

1154

}

1207

1155

1208

__attribute__((nonnull, warn_unused_result))

1209

1156

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

1210

1157

1211

1158

/* Reject the loopback device */

1253

1200

* corresponds to an acceptable network device.

1254

1201

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

1255

1202

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1203

int good_interface(const struct dirent *if_entry){

1258

1204

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

1259

1205

return 0;

1277

1223

/*

1278

1224

* This function determines if a network interface is up.

1279

1225

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1226

bool interface_is_up(const char *interface){

1282

1227

struct ifreq ifr;

1283

1228

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

1294

1239

/*

1295

1240

* This function determines if a network interface is running

1296

1241

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1242

bool interface_is_running(const char *interface){

1299

1243

struct ifreq ifr;

1300

1244

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

1308

1252

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

1309

1253

}

1310

1254

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1255

int notdotentries(const struct dirent *direntry){

1313

1256

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

1314

1257

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

1321

1264

}

1322

1265

1323

1266

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1267

int runnable_hook(const struct dirent *direntry){

1326

1268

int ret;

1327

1269

size_t sret;

1335

1277

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

1336

1278

"abcdefghijklmnopqrstuvwxyz"

1337

1279

"0123456789"

1338

"_.-");

1280

"_-");

1339

1281

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

1340

1282

/* Contains non-allowed characters */

1341

1283

if(debug){

1359

1301

}

1360

1302

return 0;

1361

1303

}

1362

free(fullname);

1363

1304

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

1364

1305

/* Not a regular file */

1365

1306

if(debug){

1383

1324

return 1;

1384

1325

}

1385

1326

1386

__attribute__((nonnull, warn_unused_result))

1387

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

1328

mandos_context *mc){

1389

1329

int ret;

1393

1333

1394

1334

while(true){

1395

1335

if(mc->current_server == NULL){

1396

if(debug){

1336

if (debug){

1397

1337

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

1398

1338

" No timeout!\n");

1399

1339

}

1400

1340

ret = avahi_simple_poll_iterate(s, -1);

1401

1341

} else {

1402

if(debug){

1342

if (debug){

1403

1343

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

1404

1344

" it, or wait\n");

1405

1345

}

1422

1362

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

1423

1363

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

1424

1364

1425

if(debug){

1365

if (debug){

1426

1366

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

1427

1367

block_time);

1428

1368

}

1450

1390

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

1451

1391

}

1452

1392

if(ret != 0){

1453

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

1393

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

1454

1394

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

1455

1395

}

1456

1396

}

1458

1398

}

1459

1399

1460

1400

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

1461

__attribute__((warn_unused_result))

1462

1401

error_t raise_privileges(void){

1463

1402

error_t old_errno = errno;

1464

1403

error_t ret_errno = 0;

1471

1410

}

1472

1411

1473

1412

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

1474

__attribute__((warn_unused_result))

1475

1413

error_t raise_privileges_permanently(void){

1476

1414

error_t old_errno = errno;

1477

1415

error_t ret_errno = raise_privileges();

1488

1426

}

1489

1427

1490

1428

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

1491

__attribute__((warn_unused_result))

1492

1429

error_t lower_privileges(void){

1493

1430

error_t old_errno = errno;

1494

1431

error_t ret_errno = 0;

1501

1438

}

1502

1439

1503

1440

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

1441

error_t lower_privileges_permanently(void){

1506

1442

error_t old_errno = errno;

1507

1443

error_t ret_errno = 0;

1513

1449

return ret_errno;

1514

1450

}

1515

1451

1516

__attribute__((nonnull))

1517

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

1452

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

1518

1453

const float delay){

1519

1454

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1520

1457

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

1521

1458

alphasort);

1522

1459

if(numhooks == -1){

1529

1466

perror_plus("scandir");

1530

1467

}

1531

1468

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

1469

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

1535

1470

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

1536

1471

direntry = direntries[i];

1548

1483

if(hook_pid == 0){

1549

1484

/* Child */

1550

1485

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1486

raise_privileges_permanently();

1555

1487

/* Set group */

1556

1488

errno = 0;

1557

1489

ret = setgid(0);

1558

1490

if(ret == -1){

1559

1491

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

1492

}

1562

1493

/* Reset supplementary groups */

1563

1494

errno = 0;

1564

1495

ret = setgroups(0, NULL);

1565

1496

if(ret == -1){

1566

1497

perror_plus("setgroups");

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

}

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1584

1502

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

1585

1503

if(ret == -1){

1586

1504

perror_plus("setenv");

1602

1520

_exit(EX_OSERR);

1603

1521

}

1604

1522

char *delaystring;

1605

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

1523

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

1606

1524

if(ret == -1){

1607

1525

perror_plus("asprintf");

1608

1526

_exit(EX_OSERR);

1661

1579

}

1662

1580

close(devnull);

1663

1581

}

1582

return true;

1664

1583

}

1665

1584

1666

__attribute__((nonnull, warn_unused_result))

1667

1585

error_t bring_up_interface(const char *const interface,

1668

1586

const float delay){

1587

int sd = -1;

1669

1588

error_t old_errno = errno;

1670

int ret;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1671

1591

struct ifreq network;

1672

1592

unsigned int if_index = if_nametoindex(interface);

1673

1593

if(if_index == 0){

1682

1602

}

1683

1603

1684

1604

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1605

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

1687

1606

ret_errno = errno;

1688

1607

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

1689

1608

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

1690

errno = old_errno;

1691

1609

return ret_errno;

1692

1610

}

1693

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

1611

network.ifr_flags |= IFF_UP;

1694

1612

1695

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

1696

if(sd == -1){

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1697

1615

ret_errno = errno;

1698

1616

perror_plus("socket");

1699

1617

errno = old_errno;

1700

1618

return ret_errno;

1701

1619

}

1702

1620

1703

1621

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1622

close(sd);

1708

1623

errno = old_errno;

1709

1624

return EINTR;

1710

1625

}

1714

1629

interface);

1715

1630

}

1716

1631

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1632

/* Raise priviliges */

1633

raise_privileges();

1722

1634

1723

1635

#ifdef __linux__

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

}

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");

1735

1643

}

1736

1644

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1645

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

1646

ret_errno = errno;

1739

1647

#ifdef __linux__

1740

1648

if(restore_loglevel){

1741

1649

ret_linux = klogctl(7, NULL, 0);

1745

1653

}

1746

1654

#endif /* __linux__ */

1747

1655

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

}

1656

/* Lower privileges */

1657

lower_privileges();

1757

1658

1758

1659

/* Close the socket */

1759

1660

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

1762

1663

}

1763

1664

1764

1665

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1666

errno = ret_errno;

1766

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

1668

errno = old_errno;

1768

return ioctl_errno;

1669

return ret_errno;

1769

1670

}

1770

1671

} else if(debug){

1771

1672

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

1789

1690

return 0;

1790

1691

}

1791

1692

1792

__attribute__((nonnull, warn_unused_result))

1793

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1794

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1795

1698

struct ifreq network;

1796

1699

unsigned int if_index = if_nametoindex(interface);

1797

1700

if(if_index == 0){

1800

1703

return ENXIO;

1801

1704

}

1802

1705

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

1706

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

1805

1707

ret_errno = errno;

1806

1708

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

1807

1709

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

1808

errno = old_errno;

1809

1710

return ret_errno;

1810

1711

}

1811

1712

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

1812

1713

1813

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

1814

if(sd == -1){

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1815

1716

ret_errno = errno;

1816

1717

perror_plus("socket");

1817

1718

errno = old_errno;

1823

1724

interface);

1824

1725

}

1825

1726

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

}

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();

1844

1735

1845

1736

/* Close the socket */

1846

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

1737

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

1847

1738

if(ret == -1){

1848

1739

perror_plus("close");

1849

1740

}

1850

1741

1851

1742

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1743

errno = ret_errno;

1853

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

1745

errno = old_errno;

1855

return ioctl_errno;

1746

return ret_errno;

1856

1747

}

1857

1748

} else if(debug){

1858

1749

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

1866

1757

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

1867

1758

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

1868

1759

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

1869

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

1760

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

1870

1761

.interfaces = NULL, .interfaces_size = 0 };

1871

1762

AvahiSServiceBrowser *sb = NULL;

1872

1763

error_t ret_errno;

1876

1767

int exitcode = EXIT_SUCCESS;

1877

1768

char *interfaces_to_take_down = NULL;

1878

1769

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1770

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

1771

bool tempdir_created = false;

1882

1772

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1883

1773

const char *seckey = PATHDIR "/" SECKEY;

1884

1774

const char *pubkey = PATHDIR "/" PUBKEY;

1885

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1886

1777

1887

1778

bool gnutls_initialized = false;

1888

1779

bool gpgme_initialized = false;

2066

1957

/* Work around Debian bug #633582:

2067

1958

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

2068

1959

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 {

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2075

1962

struct stat st;

2076

1963

2077

1964

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

2117

2004

}

2118

2005

2119

2006

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2124

2011

}

2125

2012

}

2126

2013

}

2127

2014

2128

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

2015

/* Remove empty interface names */

2129

2016

{

2130

2017

char *interface = NULL;

2131

2018

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

2132

2019

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2020

if(if_nametoindex(interface) == 0){

2021

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

2136

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2137

2023

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

2138

2024

}

2144

2030

2145

2031

/* Run network hooks */

2146

2032

{

2033

2147

2034

if(mc.interfaces != NULL){

2148

2035

interfaces_hooks = malloc(mc.interfaces_size);

2149

2036

if(interfaces_hooks == NULL){

2151

2038

goto end;

2152

2039

}

2153

2040

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

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

}

2158

2049

}

2159

2050

2160

2051

if(not debug){

2248

2139

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

2249

2140

direntries[i]->d_name);

2250

2141

if(ret_errno != 0){

2251

errno = ret_errno;

2252

2142

perror_plus("argz_add");

2253

2143

continue;

2254

2144

}

2266

2156

}

2267

2157

}

2268

2158

2269

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

2270

{

2159

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

2160

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

2161

if(debug){

2162

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2163

mc.interfaces);

2164

}

2165

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

2166

}

2167

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)){

2271

2171

char *interface = NULL;

2272

2172

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

2273

2173

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

2174

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2175

ret = bring_up_interface(interface, delay);

2292

2176

if(not interface_was_up){

2293

if(errno != 0){

2177

if(ret != 0){

2178

errno = ret;

2294

2179

perror_plus("Failed to bring up interface");

2295

2180

} 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

}

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2302

2184

}

2303

2185

}

2304

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2305

2190

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

2306

2191

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

2307

2192

}

2308

2193

}

2309

2194

2310

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

2311

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

2312

if(debug){

2313

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2314

mc.interfaces);

2315

}

2316

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

2317

}

2318

2319

2195

if(quit_now){

2320

2196

goto end;

2321

2197

}

2333

2209

goto end;

2334

2210

}

2335

2211

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){

2212

if(mkdtemp(tempdir) == NULL){

2346

2213

perror_plus("mkdtemp");

2347

2214

goto end;

2348

2215

}

2216

tempdir_created = true;

2349

2217

2350

2218

if(quit_now){

2351

2219

goto end;

2387

2255

exitcode = EX_USAGE;

2388

2256

goto end;

2389

2257

}

2390

2258

2391

2259

if(quit_now){

2392

2260

goto end;

2393

2261

}

2423

2291

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

2424

2292

(int)retry_interval);

2425

2293

}

2426

sleep((unsigned int)retry_interval);

2294

sleep((int)retry_interval);

2427

2295

}

2428

2296

2429

if(not quit_now){

2297

if (not quit_now){

2430

2298

exitcode = EXIT_SUCCESS;

2431

2299

}

2432

2300

2487

2355

if(debug){

2488

2356

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

2489

2357

}

2490

2358

2491

2359

ret = avahi_loop_with_timeout(simple_poll,

2492

2360

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

2493

2361

if(debug){

2502

2370

}

2503

2371

2504

2372

/* Cleanup things */

2505

free(mc.interfaces);

2506

2507

2373

if(sb != NULL)

2508

2374

avahi_s_service_browser_free(sb);

2509

2375

2534

2400

}

2535

2401

}

2536

2402

2537

/* Re-raise privileges */

2403

/* Re-raise priviliges */

2538

2404

{

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

}

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();

2571

2430

}

2572

2431

2573

2432

free(interfaces_to_take_down);

2574

2433

free(interfaces_hooks);

2575

2434

2576

2435

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

2577

if(tempdir != NULL){

2436

if(tempdir_created){

2578

2437

struct dirent **direntries = NULL;

2579

2438

struct dirent *direntry = NULL;

2580

2439

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

2581

2440

alphasort);

2582

if(numentries > 0){

2441

if (numentries > 0){

2583

2442

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

2584

2443

direntry = direntries[i];

2585

2444

char *fullname = NULL;

2597

2456

free(fullname);

2598

2457

}

2599

2458

}

2600

2459

2601

2460

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

2602

2461

free(direntries);

2603

if(numentries == -1){

2462

if (numentries == -1){

2604

2463

perror_plus("scandir");

2605

2464

}

2606

2465

ret = rmdir(tempdir);