/mandos/trunk : revision 658

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

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

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() */

141

138

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

142

139

char *connect_to = NULL;

143

140

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

141

uid_t uid = 65534;

146

142

gid_t gid = 65534;

147

143

184

180

perror(print_text);

185

181

}

186

182

187

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

183

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

188

184

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

189

185

va_list ap;

190

186

va_start (ap, format);

199

195

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

200

196

* "buffer_length" is how much is already used.

201

197

*/

202

__attribute__((nonnull, warn_unused_result))

203

198

size_t incbuffer(char **buffer, size_t buffer_length,

204

199

size_t buffer_capacity){

205

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

201

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

202

if(buffer == NULL){

212

203

return 0;

213

204

}

214

*buffer = new_buf;

215

205

buffer_capacity += BUFFER_SIZE;

216

206

}

217

207

return buffer_capacity;

218

208

}

219

209

220

210

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

221

__attribute__((nonnull, warn_unused_result))

222

211

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

223

212

int af, server **current_server){

224

213

int ret;

235

224

perror_plus("strdup");

236

225

return false;

237

226

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

227

/* Special case of first server */

244

228

if(*current_server == NULL){

245

229

new_server->next = new_server;

246

230

new_server->prev = new_server;

247

231

*current_server = new_server;

232

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

248

233

} else {

249

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

250

234

new_server->next = *current_server;

251

235

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

252

236

new_server->prev->next = new_server;

253

237

(*current_server)->prev = new_server;

254

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

255

244

return true;

256

245

}

257

246

258

247

/*

259

248

* Initialize GPGME.

260

249

*/

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

250

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

251

const char *tempdir, mandos_context *mc){

266

252

gpgme_error_t rc;

267

253

gpgme_engine_info_t engine_info;

268

254

269

255

/*

270

256

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

271

257

*/

272

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

273

259

int ret;

274

260

int fd;

275

261

gpgme_data_t pgp_data;

356

342

* Decrypt OpenPGP data.

357

343

* Returns -1 on error

358

344

*/

359

__attribute__((nonnull, warn_unused_result))

360

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

361

346

size_t crypto_size,

362

347

char **plaintext,

482

467

return plaintext_length;

483

468

}

484

469

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

487

471

const char *ret = gnutls_strerror(value);

488

472

if(ret == NULL)

489

473

ret = "(unknown)";

491

475

}

492

476

493

477

/* GnuTLS log function callback */

494

__attribute__((nonnull))

495

478

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

496

479

const char* string){

497

480

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

498

481

}

499

482

500

__attribute__((nonnull, warn_unused_result))

501

483

static int init_gnutls_global(const char *pubkeyfilename,

502

484

const char *seckeyfilename,

503

485

mandos_context *mc){

577

559

return -1;

578

560

}

579

561

580

__attribute__((nonnull, warn_unused_result))

581

562

static int init_gnutls_session(gnutls_session_t *session,

582

563

mandos_context *mc){

583

564

int ret;

640

621

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

641

622

642

623

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

644

624

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

645

625

AvahiIfIndex if_index,

646

626

int af, mandos_context *mc){

647

627

int ret, tcp_sd = -1;

648

628

ssize_t sret;

649

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

650

633

char *buffer = NULL;

651

634

char *decrypted_buffer = NULL;

652

635

size_t buffer_length = 0;

733

716

734

717

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

735

718

if(af == AF_INET6){

736

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

737

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

738

721

} else { /* IPv4 */

739

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

740

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

722

to.in.sin_family = (sa_family_t)af;

723

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

741

724

}

742

725

if(ret < 0 ){

743

726

int e = errno;

752

735

goto mandos_end;

753

736

}

754

737

if(af == AF_INET6){

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

758

748

if(if_index == AVAHI_IF_UNSPEC){

759

749

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

760

750

" incomplete without a network interface\n");

762

752

goto mandos_end;

763

753

}

764

754

/* Set the network interface number as scope */

765

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

755

to.in6.sin6_scope_id = (uint32_t)if_index;

766

756

}

767

757

} else {

768

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

758

to.in.sin_port = htons(port);

769

759

}

770

760

771

761

if(quit_now){

788

778

}

789

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

790

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

781

const char *pcret;

791

782

if(af == AF_INET6){

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

783

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

784

sizeof(addrstr));

796

785

} else {

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

786

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

787

sizeof(addrstr));

801

788

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

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

793

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

794

}

808

795

}

809

796

}

810

797

814

801

}

815

802

816

803

if(af == AF_INET6){

817

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

818

sizeof(struct sockaddr_in6));

804

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

819

805

} else {

820

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

821

sizeof(struct sockaddr_in));

806

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

822

807

}

823

808

if(ret < 0){

824

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

809

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

825

810

int e = errno;

826

811

perror_plus("connect");

827

812

errno = e;

1042

1027

return retval;

1043

1028

}

1044

1029

1045

__attribute__((nonnull))

1046

1030

static void resolve_callback(AvahiSServiceResolver *r,

1047

1031

AvahiIfIndex interface,

1048

1032

AvahiProtocol proto,

1056

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1057

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1042

flags,

1059

void *mc){

1043

void* mc){

1060

1044

if(r == NULL){

1061

1045

return;

1062

1046

}

1115

1099

const char *domain,

1116

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1117

1101

flags,

1118

void *mc){

1102

void* mc){

1119

1103

if(b == NULL){

1120

1104

return;

1121

1105

}

1181

1165

errno = old_errno;

1182

1166

}

1183

1167

1184

__attribute__((nonnull, warn_unused_result))

1185

1168

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

1186

1169

int ret;

1187

1170

error_t ret_errno;

1206

1189

return true;

1207

1190

}

1208

1191

1209

__attribute__((nonnull, warn_unused_result))

1210

1192

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

1211

1193

1212

1194

/* Reject the loopback device */

1254

1236

* corresponds to an acceptable network device.

1255

1237

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

1256

1238

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

1239

int good_interface(const struct dirent *if_entry){

1259

1240

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

1260

1241

return 0;

1278

1259

/*

1279

1260

* This function determines if a network interface is up.

1280

1261

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

1262

bool interface_is_up(const char *interface){

1283

1263

struct ifreq ifr;

1284

1264

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

1295

1275

/*

1296

1276

* This function determines if a network interface is running

1297

1277

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

1278

bool interface_is_running(const char *interface){

1300

1279

struct ifreq ifr;

1301

1280

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

1309

1288

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

1310

1289

}

1311

1290

1312

__attribute__((nonnull, pure, warn_unused_result))

1313

1291

int notdotentries(const struct dirent *direntry){

1314

1292

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

1315

1293

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

1322

1300

}

1323

1301

1324

1302

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

1325

__attribute__((nonnull, warn_unused_result))

1326

1303

int runnable_hook(const struct dirent *direntry){

1327

1304

int ret;

1328

1305

size_t sret;

1336

1313

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

1337

1314

"abcdefghijklmnopqrstuvwxyz"

1338

1315

"0123456789"

1339

"_.-");

1316

"_-");

1340

1317

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

1341

1318

/* Contains non-allowed characters */

1342

1319

if(debug){

1360

1337

}

1361

1338

return 0;

1362

1339

}

1363

free(fullname);

1364

1340

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

1365

1341

/* Not a regular file */

1366

1342

if(debug){

1384

1360

return 1;

1385

1361

}

1386

1362

1387

__attribute__((nonnull, warn_unused_result))

1388

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

1364

mandos_context *mc){

1390

1365

int ret;

1394

1369

1395

1370

while(true){

1396

1371

if(mc->current_server == NULL){

1397

if(debug){

1372

if (debug){

1398

1373

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

1399

1374

" No timeout!\n");

1400

1375

}

1401

1376

ret = avahi_simple_poll_iterate(s, -1);

1402

1377

} else {

1403

if(debug){

1378

if (debug){

1404

1379

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

1405

1380

" it, or wait\n");

1406

1381

}

1423

1398

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

1424

1399

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

1425

1400

1426

if(debug){

1401

if (debug){

1427

1402

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

1428

1403

block_time);

1429

1404

}

1451

1426

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

1452

1427

}

1453

1428

if(ret != 0){

1454

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

1429

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

1455

1430

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

1456

1431

}

1457

1432

}

1459

1434

}

1460

1435

1461

1436

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

1462

__attribute__((warn_unused_result))

1463

1437

error_t raise_privileges(void){

1464

1438

error_t old_errno = errno;

1465

1439

error_t ret_errno = 0;

1472

1446

}

1473

1447

1474

1448

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

1475

__attribute__((warn_unused_result))

1476

1449

error_t raise_privileges_permanently(void){

1477

1450

error_t old_errno = errno;

1478

1451

error_t ret_errno = raise_privileges();

1489

1462

}

1490

1463

1491

1464

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

1492

__attribute__((warn_unused_result))

1493

1465

error_t lower_privileges(void){

1494

1466

error_t old_errno = errno;

1495

1467

error_t ret_errno = 0;

1502

1474

}

1503

1475

1504

1476

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

1477

error_t lower_privileges_permanently(void){

1507

1478

error_t old_errno = errno;

1508

1479

error_t ret_errno = 0;

1514

1485

return ret_errno;

1515

1486

}

1516

1487

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

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

1488

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

1538

1489

const float delay){

1539

1490

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1574

runnable_hook, alphasort);

1575

#else /* not __GLIBC_PREREQ(2, 15) */

1576

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

1577

alphasort);

1578

#endif /* not __GLIBC_PREREQ(2, 15) */

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1583

1495

if(numhooks == -1){

1584

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

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

1590

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

1591

direntry = direntries[i];

1592

char *fullname = NULL;

1593

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1594

if(ret < 0){

1595

perror_plus("asprintf");

1596

continue;

1597

}

1598

if(debug){

1599

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1600

direntry->d_name);

1601

}

1602

pid_t hook_pid = fork();

1603

if(hook_pid == 0){

1604

/* Child */

1605

/* Raise privileges */

1606

if(raise_privileges_permanently() != 0){

1607

perror_plus("Failed to raise privileges");

1608

_exit(EX_NOPERM);

1609

}

1610

/* Set group */

1611

errno = 0;

1612

ret = setgid(0);

1613

if(ret == -1){

1614

perror_plus("setgid");

1615

_exit(EX_NOPERM);

1616

}

1617

/* Reset supplementary groups */

1618

errno = 0;

1619

ret = setgroups(0, NULL);

1620

if(ret == -1){

1621

perror_plus("setgroups");

1622

_exit(EX_NOPERM);

1623

}

1624

ret = dup2(devnull, STDIN_FILENO);

1625

if(ret == -1){

1626

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

1627

_exit(EX_OSERR);

1628

}

1629

ret = close(devnull);

1630

if(ret == -1){

1631

perror_plus("close");

1632

_exit(EX_OSERR);

1633

}

1634

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1635

if(ret == -1){

1636

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

1637

_exit(EX_OSERR);

1638

}

1639

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

1640

if(ret == -1){

1641

perror_plus("setenv");

1642

_exit(EX_OSERR);

1643

}

1644

ret = setenv("DEVICE", interface, 1);

1645

if(ret == -1){

1646

perror_plus("setenv");

1647

_exit(EX_OSERR);

1648

}

1649

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1650

if(ret == -1){

1651

perror_plus("setenv");

1652

_exit(EX_OSERR);

1653

}

1654

ret = setenv("MODE", mode, 1);

1655

if(ret == -1){

1656

perror_plus("setenv");

1657

_exit(EX_OSERR);

1658

}

1659

char *delaystring;

1660

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

1661

if(ret == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1510

if(ret < 0){

1662

1511

perror_plus("asprintf");

1663

_exit(EX_OSERR);

1664

}

1665

ret = setenv("DELAY", delaystring, 1);

1666

if(ret == -1){

1512

continue;

1513

}

1514

if(debug){

1515

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

ret = setenv("DEVICE", interface, 1);

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

ret = setenv("MODE", mode, 1);

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

ret = setenv("DELAY", delaystring, 1);

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1667

1570

free(delaystring);

1668

perror_plus("setenv");

1669

_exit(EX_OSERR);

1670

}

1671

free(delaystring);

1672

if(connect_to != NULL){

1673

ret = setenv("CONNECT", connect_to, 1);

1674

if(ret == -1){

1675

perror_plus("setenv");

1676

_exit(EX_OSERR);

1677

}

1678

}

1679

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1680

perror_plus("execl");

1681

_exit(EXIT_FAILURE);

1682

}

1683

} else {

1684

int status;

1685

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1686

perror_plus("waitpid");

1687

free(fullname);

1688

continue;

1689

}

1690

if(WIFEXITED(status)){

1691

if(WEXITSTATUS(status) != 0){

1692

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1693

" with status %d\n", direntry->d_name,

1694

WEXITSTATUS(status));

1695

free(fullname);

1696

continue;

1697

}

1698

} else if(WIFSIGNALED(status)){

1699

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1700

" signal %d\n", direntry->d_name,

1701

WTERMSIG(status));

1702

free(fullname);

1703

continue;

1571

if(connect_to != NULL){

1572

ret = setenv("CONNECT", connect_to, 1);

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1704

1582

} else {

1705

fprintf_plus(stderr, "Warning: network hook \"%s\""

1706

" crashed\n", direntry->d_name);

1707

free(fullname);

1708

continue;

1709

}

1710

}

1711

free(fullname);

1712

if(debug){

1713

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1714

direntry->d_name);

1715

}

1716

}

1717

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1718

perror_plus("close");

1719

} else {

1720

hookdir_fd = -1;

1721

}

1722

close(devnull);

1583

int status;

1584

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1592

" with status %d\n", direntry->d_name,

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1599

" signal %d\n", direntry->d_name,

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

fprintf_plus(stderr, "Warning: network hook \"%s\""

1605

" crashed\n", direntry->d_name);

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

1723

1619

}

1724

1620

1725

__attribute__((nonnull, warn_unused_result))

1726

1621

error_t bring_up_interface(const char *const interface,

1727

1622

const float delay){

1623

int sd = -1;

1728

1624

error_t old_errno = errno;

1729

int ret;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1730

1627

struct ifreq network;

1731

1628

unsigned int if_index = if_nametoindex(interface);

1732

1629

if(if_index == 0){

1741

1638

}

1742

1639

1743

1640

if(not interface_is_up(interface)){

1744

error_t ret_errno = 0, ioctl_errno = 0;

1745

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

1641

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

1746

1642

ret_errno = errno;

1747

1643

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

1748

1644

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

1749

errno = old_errno;

1750

1645

return ret_errno;

1751

1646

}

1752

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

1647

network.ifr_flags |= IFF_UP;

1753

1648

1754

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

1755

if(sd == -1){

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1756

1651

ret_errno = errno;

1757

1652

perror_plus("socket");

1758

1653

errno = old_errno;

1759

1654

return ret_errno;

1760

1655

}

1761

1656

1762

1657

if(quit_now){

1763

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

1764

if(ret == -1){

1765

perror_plus("close");

1766

}

1658

close(sd);

1767

1659

errno = old_errno;

1768

1660

return EINTR;

1769

1661

}

1773

1665

interface);

1774

1666

}

1775

1667

1776

/* Raise privileges */

1777

ret_errno = raise_privileges();

1778

if(ret_errno != 0){

1779

perror_plus("Failed to raise privileges");

1780

}

1668

/* Raise priviliges */

1669

raise_privileges();

1781

1670

1782

1671

#ifdef __linux__

1783

int ret_linux;

1784

bool restore_loglevel = false;

1785

if(ret_errno == 0){

1786

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1787

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

1788

ret_linux = klogctl(8, NULL, 5);

1789

if(ret_linux == -1){

1790

perror_plus("klogctl");

1791

} else {

1792

restore_loglevel = true;

1793

}

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1794

1679

}

1795

1680

#endif /* __linux__ */

1796

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

1797

ioctl_errno = errno;

1681

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

1682

ret_errno = errno;

1798

1683

#ifdef __linux__

1799

1684

if(restore_loglevel){

1800

1685

ret_linux = klogctl(7, NULL, 0);

1804

1689

}

1805

1690

#endif /* __linux__ */

1806

1691

1807

/* If raise_privileges() succeeded above */

1808

if(ret_errno == 0){

1809

/* Lower privileges */

1810

ret_errno = lower_privileges();

1811

if(ret_errno != 0){

1812

errno = ret_errno;

1813

perror_plus("Failed to lower privileges");

1814

}

1815

}

1692

/* Lower privileges */

1693

lower_privileges();

1816

1694

1817

1695

/* Close the socket */

1818

1696

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

1821

1699

}

1822

1700

1823

1701

if(ret_setflags == -1){

1824

errno = ioctl_errno;

1702

errno = ret_errno;

1825

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1826

1704

errno = old_errno;

1827

return ioctl_errno;

1705

return ret_errno;

1828

1706

}

1829

1707

} else if(debug){

1830

1708

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

1848

1726

return 0;

1849

1727

}

1850

1728

1851

__attribute__((nonnull, warn_unused_result))

1852

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1853

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1854

1734

struct ifreq network;

1855

1735

unsigned int if_index = if_nametoindex(interface);

1856

1736

if(if_index == 0){

1859

1739

return ENXIO;

1860

1740

}

1861

1741

if(interface_is_up(interface)){

1862

error_t ret_errno = 0, ioctl_errno = 0;

1863

1742

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

1864

1743

ret_errno = errno;

1865

1744

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

1866

1745

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

1867

errno = old_errno;

1868

1746

return ret_errno;

1869

1747

}

1870

1748

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

1871

1749

1872

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

1873

if(sd == -1){

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1874

1752

ret_errno = errno;

1875

1753

perror_plus("socket");

1876

1754

errno = old_errno;

1882

1760

interface);

1883

1761

}

1884

1762

1885

/* Raise privileges */

1886

ret_errno = raise_privileges();

1887

if(ret_errno != 0){

1888

perror_plus("Failed to raise privileges");

1889

}

1890

1891

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

1892

ioctl_errno = errno;

1893

1894

/* If raise_privileges() succeeded above */

1895

if(ret_errno == 0){

1896

/* Lower privileges */

1897

ret_errno = lower_privileges();

1898

if(ret_errno != 0){

1899

errno = ret_errno;

1900

perror_plus("Failed to lower privileges");

1901

}

1902

}

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1903

1771

1904

1772

/* Close the socket */

1905

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

1773

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

1906

1774

if(ret == -1){

1907

1775

perror_plus("close");

1908

1776

}

1909

1777

1910

1778

if(ret_setflags == -1){

1911

errno = ioctl_errno;

1779

errno = ret_errno;

1912

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1913

1781

errno = old_errno;

1914

return ioctl_errno;

1782

return ret_errno;

1915

1783

}

1916

1784

} else if(debug){

1917

1785

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

1925

1793

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

1926

1794

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

1927

1795

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

1928

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

1796

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

1929

1797

.interfaces = NULL, .interfaces_size = 0 };

1930

1798

AvahiSServiceBrowser *sb = NULL;

1931

1799

error_t ret_errno;

1935

1803

int exitcode = EXIT_SUCCESS;

1936

1804

char *interfaces_to_take_down = NULL;

1937

1805

size_t interfaces_to_take_down_size = 0;

1938

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

1939

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

1940

char *tempdir = NULL;

1806

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

1807

bool tempdir_created = false;

1941

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1942

1809

const char *seckey = PATHDIR "/" SECKEY;

1943

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1944

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1945

1813

1946

1814

bool gnutls_initialized = false;

1947

1815

bool gpgme_initialized = false;

2125

1993

/* Work around Debian bug #633582:

2126

1994

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

2127

1995

2128

/* Re-raise privileges */

2129

ret_errno = raise_privileges();

2130

if(ret_errno != 0){

2131

errno = ret_errno;

2132

perror_plus("Failed to raise privileges");

2133

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2134

1998

struct stat st;

2135

1999

2136

2000

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

2176

2040

}

2177

2041

2178

2042

/* Lower privileges */

2179

ret_errno = lower_privileges();

2180

if(ret_errno != 0){

2181

errno = ret_errno;

2182

perror_plus("Failed to lower privileges");

2183

}

2043

lower_privileges();

2184

2044

}

2185

2045

}

2186

2046

2210

2070

goto end;

2211

2071

}

2212

2072

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

2213

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

2214

}

2215

run_network_hooks("start", interfaces_hooks != NULL ?

2216

interfaces_hooks : "", delay);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2217

2081

}

2218

2082

2219

2083

if(not debug){

2307

2171

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

2308

2172

direntries[i]->d_name);

2309

2173

if(ret_errno != 0){

2310

errno = ret_errno;

2311

2174

perror_plus("argz_add");

2312

2175

continue;

2313

2176

}

2347

2210

break;

2348

2211

}

2349

2212

bool interface_was_up = interface_is_up(interface);

2350

errno = bring_up_interface(interface, delay);

2213

ret = bring_up_interface(interface, delay);

2351

2214

if(not interface_was_up){

2352

if(errno != 0){

2215

if(ret != 0){

2216

errno = ret;

2353

2217

perror_plus("Failed to bring up interface");

2354

2218

} else {

2355

errno = argz_add(&interfaces_to_take_down,

2356

&interfaces_to_take_down_size,

2357

interface);

2358

if(errno != 0){

2359

perror_plus("argz_add");

2360

}

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2361

2222

}

2362

2223

}

2363

2224

}

2392

2253

goto end;

2393

2254

}

2394

2255

2395

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

2396

tempdir = mkdtemp(run_tempdir);

2397

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

2398

if(debug){

2399

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

2400

run_tempdir, old_tempdir);

2401

}

2402

tempdir = mkdtemp(old_tempdir);

2403

}

2404

if(tempdir == NULL){

2256

if(mkdtemp(tempdir) == NULL){

2405

2257

perror_plus("mkdtemp");

2406

2258

goto end;

2407

2259

}

2260

tempdir_created = true;

2408

2261

2409

2262

if(quit_now){

2410

2263

goto end;

2485

2338

sleep((unsigned int)retry_interval);

2486

2339

}

2487

2340

2488

if(not quit_now){

2341

if (not quit_now){

2489

2342

exitcode = EXIT_SUCCESS;

2490

2343

}

2491

2344

2546

2399

if(debug){

2547

2400

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

2548

2401

}

2549

2402

2550

2403

ret = avahi_loop_with_timeout(simple_poll,

2551

2404

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

2552

2405

if(debug){

2593

2446

}

2594

2447

}

2595

2448

2596

/* Re-raise privileges */

2449

/* Re-raise priviliges */

2597

2450

{

2598

ret_errno = raise_privileges();

2599

if(ret_errno != 0){

2600

perror_plus("Failed to raise privileges");

2601

} else {

2602

2603

/* Run network hooks */

2604

run_network_hooks("stop", interfaces_hooks != NULL ?

2605

interfaces_hooks : "", delay);

2606

2607

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

2608

{

2609

char *interface = NULL;

2610

while((interface=argz_next(interfaces_to_take_down,

2611

interfaces_to_take_down_size,

2612

interface))){

2613

ret_errno = take_down_interface(interface);

2614

if(ret_errno != 0){

2615

errno = ret_errno;

2616

perror_plus("Failed to take down interface");

2617

}

2618

}

2619

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

2620

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

2621

" down\n");

2622

}

2623

}

2624

}

2625

2626

ret_errno = lower_privileges_permanently();

2627

if(ret_errno != 0){

2628

perror_plus("Failed to lower privileges permanently");

2629

}

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

2630

2476

}

2631

2477

2632

2478

free(interfaces_to_take_down);

2633

2479

free(interfaces_hooks);

2634

2480

2635

2481

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

2636

if(tempdir != NULL){

2482

if(tempdir_created){

2637

2483

struct dirent **direntries = NULL;

2638

2484

struct dirent *direntry = NULL;

2639

2485

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

2640

2486

alphasort);

2641

if(numentries > 0){

2487

if (numentries > 0){

2642

2488

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

2643

2489

direntry = direntries[i];

2644

2490

char *fullname = NULL;

2656

2502

free(fullname);

2657

2503

}

2658

2504

}

2659

2505

2660

2506

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

2661

2507

free(direntries);

2662

if(numentries == -1){

2508

if (numentries == -1){

2663

2509

perror_plus("scandir");

2664

2510

}

2665

2511

ret = rmdir(tempdir);