/mandos/trunk : revision 678

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

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

75

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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() */

133

136

134

137

bool debug = false;

135

138

static const char mandos_protocol_version[] = "1";

136

const char *argp_program_version = "mandos-client " VERSION;

137

const char *argp_program_bug_address = "<mandos@recompile.se>";

139

const char * argp_program_version = "mandos-client " VERSION;

140

const char * argp_program_bug_address = "<mandos@recompile.se>";

138

141

static const char sys_class_net[] = "/sys/class/net";

139

142

char *connect_to = NULL;

140

143

const char *hookdir = HOOKDIR;

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;

1324

1382

return 1;

1325

1383

}

1326

1384

1385

__attribute__((nonnull, warn_unused_result))

1327

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

1387

mandos_context *mc){

1329

1388

int ret;

1333

1392

1334

1393

while(true){

1335

1394

if(mc->current_server == NULL){

1336

if (debug){

1395

if(debug){

1337

1396

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

1338

1397

" No timeout!\n");

1339

1398

}

1340

1399

ret = avahi_simple_poll_iterate(s, -1);

1341

1400

} else {

1342

if (debug){

1401

if(debug){

1343

1402

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

1344

1403

" it, or wait\n");

1345

1404

}

1362

1421

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

1363

1422

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

1364

1423

1365

if (debug){

1424

if(debug){

1366

1425

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

1367

1426

block_time);

1368

1427

}

1390

1449

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

1391

1450

}

1392

1451

if(ret != 0){

1393

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

1452

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

1394

1453

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

1395

1454

}

1396

1455

}

1398

1457

}

1399

1458

1400

1459

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

1460

__attribute__((warn_unused_result))

1401

1461

error_t raise_privileges(void){

1402

1462

error_t old_errno = errno;

1403

1463

error_t ret_errno = 0;

1410

1470

}

1411

1471

1412

1472

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

1473

__attribute__((warn_unused_result))

1413

1474

error_t raise_privileges_permanently(void){

1414

1475

error_t old_errno = errno;

1415

1476

error_t ret_errno = raise_privileges();

1426

1487

}

1427

1488

1428

1489

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

1490

__attribute__((warn_unused_result))

1429

1491

error_t lower_privileges(void){

1430

1492

error_t old_errno = errno;

1431

1493

error_t ret_errno = 0;

1438

1500

}

1439

1501

1440

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1441

1504

error_t lower_privileges_permanently(void){

1442

1505

error_t old_errno = errno;

1443

1506

error_t ret_errno = 0;

1449

1512

return ret_errno;

1450

1513

}

1451

1514

1452

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

1515

__attribute__((nonnull))

1516

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

1453

1517

const float delay){

1454

1518

struct dirent **direntries;

1455

struct dirent *direntry;

1456

int ret;

1457

1519

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

1458

1520

alphasort);

1459

1521

if(numhooks == -1){

1466

1528

perror_plus("scandir");

1467

1529

}

1468

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1469

1533

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

1470

1534

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

1471

1535

direntry = direntries[i];

1483

1547

if(hook_pid == 0){

1484

1548

/* Child */

1485

1549

/* Raise privileges */

1486

raise_privileges_permanently();

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1487

1554

/* Set group */

1488

1555

errno = 0;

1489

1556

ret = setgid(0);

1490

1557

if(ret == -1){

1491

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1492

1560

}

1493

1561

/* Reset supplementary groups */

1494

1562

errno = 0;

1495

1563

ret = setgroups(0, NULL);

1496

1564

if(ret == -1){

1497

1565

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1502

1583

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

1503

1584

if(ret == -1){

1504

1585

perror_plus("setenv");

1520

1601

_exit(EX_OSERR);

1521

1602

}

1522

1603

char *delaystring;

1523

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

1604

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

1524

1605

if(ret == -1){

1525

1606

perror_plus("asprintf");

1526

1607

_exit(EX_OSERR);

1579

1660

}

1580

1661

close(devnull);

1581

1662

}

1582

return true;

1583

1663

}

1584

1664

1665

__attribute__((nonnull, warn_unused_result))

1585

1666

error_t bring_up_interface(const char *const interface,

1586

1667

const float delay){

1587

int sd = -1;

1588

1668

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1669

int ret;

1591

1670

struct ifreq network;

1592

1671

unsigned int if_index = if_nametoindex(interface);

1593

1672

if(if_index == 0){

1602

1681

}

1603

1682

1604

1683

if(not interface_is_up(interface)){

1605

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

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1606

1686

ret_errno = errno;

1607

1687

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

1608

1688

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

1689

errno = old_errno;

1609

1690

return ret_errno;

1610

1691

}

1611

network.ifr_flags |= IFF_UP;

1692

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

1612

1693

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1694

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

1695

if(sd == -1){

1615

1696

ret_errno = errno;

1616

1697

perror_plus("socket");

1617

1698

errno = old_errno;

1618

1699

return ret_errno;

1619

1700

}

1620

1701

1621

1702

if(quit_now){

1622

close(sd);

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1623

1707

errno = old_errno;

1624

1708

return EINTR;

1625

1709

}

1629

1713

interface);

1630

1714

}

1631

1715

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1635

1722

#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");

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1643

1733

}

1644

1734

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1735

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

1736

ioctl_errno = errno;

1647

1737

#ifdef __linux__

1648

1738

if(restore_loglevel){

1649

1739

ret_linux = klogctl(7, NULL, 0);

1653

1743

}

1654

1744

#endif /* __linux__ */

1655

1745

1656

/* Lower privileges */

1657

lower_privileges();

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1658

1755

1659

1756

/* Close the socket */

1660

1757

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

1663

1760

}

1664

1761

1665

1762

if(ret_setflags == -1){

1666

errno = ret_errno;

1763

errno = ioctl_errno;

1667

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

1765

errno = old_errno;

1669

return ret_errno;

1766

return ioctl_errno;

1670

1767

}

1671

1768

} else if(debug){

1672

1769

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

1690

1787

return 0;

1691

1788

}

1692

1789

1790

__attribute__((nonnull, warn_unused_result))

1693

1791

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

1792

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

1793

struct ifreq network;

1699

1794

unsigned int if_index = if_nametoindex(interface);

1700

1795

if(if_index == 0){

1703

1798

return ENXIO;

1704

1799

}

1705

1800

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1706

1802

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

1707

1803

ret_errno = errno;

1708

1804

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

1709

1805

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

1806

errno = old_errno;

1710

1807

return ret_errno;

1711

1808

}

1712

1809

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

1713

1810

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1811

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

1812

if(sd == -1){

1716

1813

ret_errno = errno;

1717

1814

perror_plus("socket");

1718

1815

errno = old_errno;

1724

1821

interface);

1725

1822

}

1726

1823

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();

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1735

1841

1736

1842

/* Close the socket */

1737

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

1843

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

1738

1844

if(ret == -1){

1739

1845

perror_plus("close");

1740

1846

}

1741

1847

1742

1848

if(ret_setflags == -1){

1743

errno = ret_errno;

1849

errno = ioctl_errno;

1744

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

1851

errno = old_errno;

1746

return ret_errno;

1852

return ioctl_errno;

1747

1853

}

1748

1854

} else if(debug){

1749

1855

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

1757

1863

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

1758

1864

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

1759

1865

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

1760

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

1866

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

1761

1867

.interfaces = NULL, .interfaces_size = 0 };

1762

1868

AvahiSServiceBrowser *sb = NULL;

1763

1869

error_t ret_errno;

1767

1873

int exitcode = EXIT_SUCCESS;

1768

1874

char *interfaces_to_take_down = NULL;

1769

1875

size_t interfaces_to_take_down_size = 0;

1770

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

1771

bool tempdir_created = false;

1876

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

1877

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

1878

char *tempdir = NULL;

1772

1879

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1880

const char *seckey = PATHDIR "/" SECKEY;

1774

1881

const char *pubkey = PATHDIR "/" PUBKEY;

1775

1882

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1883

1778

1884

bool gnutls_initialized = false;

1779

1885

bool gpgme_initialized = false;

1957

2063

/* Work around Debian bug #633582:

1958

2064

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

1959

2065

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

2071

} else {

1962

2072

struct stat st;

1963

2073

1964

2074

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

2004

2114

}

2005

2115

2006

2116

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

2011

2121

}

2012

2122

}

2013

2123

}

2014

2124

2015

/* Remove empty interface names */

2125

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

2016

2126

{

2017

2127

char *interface = NULL;

2018

2128

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

2019

2129

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

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

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2022

2133

fprintf_plus(stderr, "Not using nonexisting interface"

2023

2134

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

2024

2135

}

2030

2141

2031

2142

/* Run network hooks */

2032

2143

{

2033

2034

2144

if(mc.interfaces != NULL){

2035

2145

interfaces_hooks = malloc(mc.interfaces_size);

2036

2146

if(interfaces_hooks == NULL){

2038

2148

goto end;

2039

2149

}

2040

2150

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

}

2151

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

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

2049

2155

}

2050

2156

2051

2157

if(not debug){

2139

2245

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

2140

2246

direntries[i]->d_name);

2141

2247

if(ret_errno != 0){

2248

errno = ret_errno;

2142

2249

perror_plus("argz_add");

2143

2250

continue;

2144

2251

}

2156

2263

}

2157

2264

}

2158

2265

2266

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

2267

{

2268

char *interface = NULL;

2269

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

2270

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2287

bool interface_was_up = interface_is_up(interface);

2288

errno = bring_up_interface(interface, delay);

2289

if(not interface_was_up){

2290

if(errno != 0){

2291

perror_plus("Failed to bring up interface");

2292

} else {

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2299

}

2300

}

2301

}

2302

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

2303

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

2304

}

2305

}

2306

2159

2307

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

2160

2308

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

2161

2309

if(debug){

2165

2313

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

2166

2314

}

2167

2315

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

2316

if(quit_now){

2196

2317

goto end;

2197

2318

}

2209

2330

goto end;

2210

2331

}

2211

2332

2212

if(mkdtemp(tempdir) == NULL){

2333

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

2334

tempdir = mkdtemp(run_tempdir);

2335

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

2336

if(debug){

2337

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

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

2213

2343

perror_plus("mkdtemp");

2214

2344

goto end;

2215

2345

}

2216

tempdir_created = true;

2217

2346

2218

2347

if(quit_now){

2219

2348

goto end;

2255

2384

exitcode = EX_USAGE;

2256

2385

goto end;

2257

2386

}

2258

2387

2259

2388

if(quit_now){

2260

2389

goto end;

2261

2390

}

2291

2420

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

2292

2421

(int)retry_interval);

2293

2422

}

2294

sleep((int)retry_interval);

2423

sleep((unsigned int)retry_interval);

2295

2424

}

2296

2425

2297

if (not quit_now){

2426

if(not quit_now){

2298

2427

exitcode = EXIT_SUCCESS;

2299

2428

}

2300

2429

2370

2499

}

2371

2500

2372

2501

/* Cleanup things */

2502

free(mc.interfaces);

2503

2373

2504

if(sb != NULL)

2374

2505

avahi_s_service_browser_free(sb);

2375

2506

2400

2531

}

2401

2532

}

2402

2533

2403

/* Re-raise priviliges */

2534

/* Re-raise privileges */

2404

2535

{

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();

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2562

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2566

}

2430

2567

}

2431

2568

2432

2569

free(interfaces_to_take_down);

2433

2570

free(interfaces_hooks);

2434

2571

2435

2572

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

2436

if(tempdir_created){

2573

if(tempdir != NULL){

2437

2574

struct dirent **direntries = NULL;

2438

2575

struct dirent *direntry = NULL;

2439

2576

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

2440

2577

alphasort);

2441

if (numentries > 0){

2578

if(numentries > 0){

2442

2579

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

2443

2580

direntry = direntries[i];

2444

2581

char *fullname = NULL;

2459

2596

2460

2597

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

2461

2598

free(direntries);

2462

if (numentries == -1){

2599

if(numentries == -1){

2463

2600

perror_plus("scandir");

2464

2601

}

2465

2602

ret = rmdir(tempdir);