/mandos/trunk : revision 602

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() */

164

161

const char *priority;

165

162

gpgme_ctx_t ctx;

166

163

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

164

} mandos_context;

170

165

171

166

/* global so signal handler can reach it*/

183

178

perror(print_text);

184

179

}

185

180

186

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

181

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

187

182

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

188

183

va_list ap;

189

184

va_start (ap, format);

190

185

191

186

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

192

187

program_invocation_short_name));

193

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

188

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

194

189

}

195

190

196

191

/*

198

193

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

199

194

* "buffer_length" is how much is already used.

200

195

*/

201

__attribute__((nonnull, warn_unused_result))

202

196

size_t incbuffer(char **buffer, size_t buffer_length,

203

197

size_t buffer_capacity){

204

198

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;

199

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

200

if(buffer == NULL){

211

201

return 0;

212

202

}

213

*buffer = new_buf;

214

203

buffer_capacity += BUFFER_SIZE;

215

204

}

216

205

return buffer_capacity;

217

206

}

218

207

219

208

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

220

__attribute__((nonnull, warn_unused_result))

221

209

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

222

210

int af, server **current_server){

223

211

int ret;

234

222

perror_plus("strdup");

235

223

return false;

236

224

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

225

/* Special case of first server */

243

226

if(*current_server == NULL){

244

227

new_server->next = new_server;

245

228

new_server->prev = new_server;

246

229

*current_server = new_server;

230

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

247

231

} else {

248

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

249

232

new_server->next = *current_server;

250

233

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

251

234

new_server->prev->next = new_server;

252

235

(*current_server)->prev = new_server;

253

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

254

242

return true;

255

243

}

256

244

257

245

/*

258

246

* Initialize GPGME.

259

247

*/

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){

248

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

249

const char *tempdir, mandos_context *mc){

265

250

gpgme_error_t rc;

266

251

gpgme_engine_info_t engine_info;

267

252

268

253

/*

269

254

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

270

255

*/

271

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

272

257

int ret;

273

258

int fd;

274

259

gpgme_data_t pgp_data;

355

340

* Decrypt OpenPGP data.

356

341

* Returns -1 on error

357

342

*/

358

__attribute__((nonnull, warn_unused_result))

359

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

344

size_t crypto_size,

361

345

char **plaintext,

481

465

return plaintext_length;

482

466

}

483

467

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

468

static const char * safer_gnutls_strerror(int value){

486

469

const char *ret = gnutls_strerror(value);

487

470

if(ret == NULL)

488

471

ret = "(unknown)";

490

473

}

491

474

492

475

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

476

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

495

477

const char* string){

496

478

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

497

479

}

498

480

499

__attribute__((nonnull, warn_unused_result))

500

481

static int init_gnutls_global(const char *pubkeyfilename,

501

482

const char *seckeyfilename,

502

483

mandos_context *mc){

576

557

return -1;

577

558

}

578

559

579

__attribute__((nonnull, warn_unused_result))

580

560

static int init_gnutls_session(gnutls_session_t *session,

581

561

mandos_context *mc){

582

562

int ret;

639

619

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

640

620

641

621

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

622

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

644

623

AvahiIfIndex if_index,

645

624

int af, mandos_context *mc){

646

625

int ret, tcp_sd = -1;

647

626

ssize_t sret;

648

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

649

631

char *buffer = NULL;

650

632

char *decrypted_buffer = NULL;

651

633

size_t buffer_length = 0;

675

657

return -1;

676

658

}

677

659

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

660

ret = init_gnutls_session(&session, mc);

711

661

if(ret != 0){

712

662

return -1;

732

682

733

683

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

734

684

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);

685

to.in6.sin6_family = (sa_family_t)af;

686

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

737

687

} 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);

688

to.in.sin_family = (sa_family_t)af;

689

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

740

690

}

741

691

if(ret < 0 ){

742

692

int e = errno;

751

701

goto mandos_end;

752

702

}

753

703

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)){

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

757

708

if(if_index == AVAHI_IF_UNSPEC){

758

709

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

759

710

" incomplete without a network interface\n");

761

712

goto mandos_end;

762

713

}

763

714

/* Set the network interface number as scope */

764

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

715

to.in6.sin6_scope_id = (uint32_t)if_index;

765

716

}

766

717

} else {

767

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

718

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

719

-Wconversion and

720

-Wunreachable-code */

768

721

}

769

722

770

723

if(quit_now){

787

740

}

788

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

790

744

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

745

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

746

sizeof(addrstr));

795

747

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

748

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

749

sizeof(addrstr));

800

750

}

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);

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

807

757

}

808

758

}

809

759

813

763

}

814

764

815

765

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

766

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

818

767

} else {

819

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

820

sizeof(struct sockaddr_in));

768

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

821

769

}

822

770

if(ret < 0){

823

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

771

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

824

772

int e = errno;

825

773

perror_plus("connect");

826

774

errno = e;

1041

989

return retval;

1042

990

}

1043

991

1044

__attribute__((nonnull))

1045

992

static void resolve_callback(AvahiSServiceResolver *r,

1046

993

AvahiIfIndex interface,

1047

994

AvahiProtocol proto,

1055

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1004

flags,

1058

void *mc){

1005

void* mc){

1059

1006

if(r == NULL){

1060

1007

return;

1061

1008

}

1114

1061

const char *domain,

1115

1062

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1063

flags,

1117

void *mc){

1064

void* mc){

1118

1065

if(b == NULL){

1119

1066

return;

1120

1067

}

1180

1127

errno = old_errno;

1181

1128

}

1182

1129

1183

__attribute__((nonnull, warn_unused_result))

1184

1130

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

1185

1131

int ret;

1186

1132

error_t ret_errno;

1205

1151

return true;

1206

1152

}

1207

1153

1208

__attribute__((nonnull, warn_unused_result))

1209

1154

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

1210

1155

1211

1156

/* Reject the loopback device */

1253

1198

* corresponds to an acceptable network device.

1254

1199

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

1255

1200

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1201

int good_interface(const struct dirent *if_entry){

1258

1202

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

1259

1203

return 0;

1277

1221

/*

1278

1222

* This function determines if a network interface is up.

1279

1223

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1224

bool interface_is_up(const char *interface){

1282

1225

struct ifreq ifr;

1283

1226

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

1294

1237

/*

1295

1238

* This function determines if a network interface is running

1296

1239

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1240

bool interface_is_running(const char *interface){

1299

1241

struct ifreq ifr;

1300

1242

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

1308

1250

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

1309

1251

}

1310

1252

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1253

int notdotentries(const struct dirent *direntry){

1313

1254

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

1314

1255

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

1321

1262

}

1322

1263

1323

1264

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1265

int runnable_hook(const struct dirent *direntry){

1326

1266

int ret;

1327

1267

size_t sret;

1335

1275

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

1336

1276

"abcdefghijklmnopqrstuvwxyz"

1337

1277

"0123456789"

1338

"_.-");

1278

"_-");

1339

1279

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

1340

1280

/* Contains non-allowed characters */

1341

1281

if(debug){

1359

1299

}

1360

1300

return 0;

1361

1301

}

1362

free(fullname);

1363

1302

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

1364

1303

/* Not a regular file */

1365

1304

if(debug){

1383

1322

return 1;

1384

1323

}

1385

1324

1386

__attribute__((nonnull, warn_unused_result))

1387

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

1326

mandos_context *mc){

1389

1327

int ret;

1393

1331

1394

1332

while(true){

1395

1333

if(mc->current_server == NULL){

1396

if(debug){

1334

if (debug){

1397

1335

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

1398

1336

" No timeout!\n");

1399

1337

}

1400

1338

ret = avahi_simple_poll_iterate(s, -1);

1401

1339

} else {

1402

if(debug){

1340

if (debug){

1403

1341

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

1404

1342

" it, or wait\n");

1405

1343

}

1422

1360

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

1423

1361

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

1424

1362

1425

if(debug){

1363

if (debug){

1426

1364

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

1427

1365

block_time);

1428

1366

}

1450

1388

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

1451

1389

}

1452

1390

if(ret != 0){

1453

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

1391

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

1454

1392

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

1455

1393

}

1456

1394

}

1458

1396

}

1459

1397

1460

1398

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

1461

__attribute__((warn_unused_result))

1462

1399

error_t raise_privileges(void){

1463

1400

error_t old_errno = errno;

1464

1401

error_t ret_errno = 0;

1471

1408

}

1472

1409

1473

1410

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

1474

__attribute__((warn_unused_result))

1475

1411

error_t raise_privileges_permanently(void){

1476

1412

error_t old_errno = errno;

1477

1413

error_t ret_errno = raise_privileges();

1488

1424

}

1489

1425

1490

1426

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

1491

__attribute__((warn_unused_result))

1492

1427

error_t lower_privileges(void){

1493

1428

error_t old_errno = errno;

1494

1429

error_t ret_errno = 0;

1501

1436

}

1502

1437

1503

1438

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

1439

error_t lower_privileges_permanently(void){

1506

1440

error_t old_errno = errno;

1507

1441

error_t ret_errno = 0;

1513

1447

return ret_errno;

1514

1448

}

1515

1449

1516

__attribute__((nonnull))

1517

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

1450

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

1518

1451

const float delay){

1519

1452

struct dirent **direntries;

1453

struct dirent *direntry;

1454

int ret;

1520

1455

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

1521

1456

alphasort);

1522

1457

if(numhooks == -1){

1529

1464

perror_plus("scandir");

1530

1465

}

1531

1466

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

1467

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

1535

1468

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

1536

1469

direntry = direntries[i];

1548

1481

if(hook_pid == 0){

1549

1482

/* Child */

1550

1483

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1484

raise_privileges_permanently();

1555

1485

/* Set group */

1556

1486

errno = 0;

1557

1487

ret = setgid(0);

1558

1488

if(ret == -1){

1559

1489

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

1490

}

1562

1491

/* Reset supplementary groups */

1563

1492

errno = 0;

1564

1493

ret = setgroups(0, NULL);

1565

1494

if(ret == -1){

1566

1495

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

}

1496

}

1497

dup2(devnull, STDIN_FILENO);

1498

close(devnull);

1499

dup2(STDERR_FILENO, STDOUT_FILENO);

1584

1500

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

1585

1501

if(ret == -1){

1586

1502

perror_plus("setenv");

1602

1518

_exit(EX_OSERR);

1603

1519

}

1604

1520

char *delaystring;

1605

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

1521

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

1606

1522

if(ret == -1){

1607

1523

perror_plus("asprintf");

1608

1524

_exit(EX_OSERR);

1661

1577

}

1662

1578

close(devnull);

1663

1579

}

1580

return true;

1664

1581

}

1665

1582

1666

__attribute__((nonnull, warn_unused_result))

1667

1583

error_t bring_up_interface(const char *const interface,

1668

1584

const float delay){

1585

int sd = -1;

1669

1586

error_t old_errno = errno;

1670

int ret;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1671

1589

struct ifreq network;

1672

1590

unsigned int if_index = if_nametoindex(interface);

1673

1591

if(if_index == 0){

1682

1600

}

1683

1601

1684

1602

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1603

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

1687

1604

ret_errno = errno;

1688

1605

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

1689

1606

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

1690

errno = old_errno;

1691

1607

return ret_errno;

1692

1608

}

1693

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

1609

network.ifr_flags |= IFF_UP;

1694

1610

1695

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

1696

if(sd == -1){

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1697

1613

ret_errno = errno;

1698

1614

perror_plus("socket");

1699

1615

errno = old_errno;

1700

1616

return ret_errno;

1701

1617

}

1702

1618

1703

1619

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1620

close(sd);

1708

1621

errno = old_errno;

1709

1622

return EINTR;

1710

1623

}

1714

1627

interface);

1715

1628

}

1716

1629

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1630

/* Raise priviliges */

1631

raise_privileges();

1722

1632

1723

1633

#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

}

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

1735

1641

}

1736

1642

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1643

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

1644

ret_errno = errno;

1739

1645

#ifdef __linux__

1740

1646

if(restore_loglevel){

1741

1647

ret_linux = klogctl(7, NULL, 0);

1745

1651

}

1746

1652

#endif /* __linux__ */

1747

1653

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

}

1654

/* Lower privileges */

1655

lower_privileges();

1757

1656

1758

1657

/* Close the socket */

1759

1658

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

1762

1661

}

1763

1662

1764

1663

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1664

errno = ret_errno;

1766

1665

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

1666

errno = old_errno;

1768

return ioctl_errno;

1667

return ret_errno;

1769

1668

}

1770

1669

} else if(debug){

1771

1670

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

1789

1688

return 0;

1790

1689

}

1791

1690

1792

__attribute__((nonnull, warn_unused_result))

1793

1691

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1794

1693

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1795

1696

struct ifreq network;

1796

1697

unsigned int if_index = if_nametoindex(interface);

1797

1698

if(if_index == 0){

1800

1701

return ENXIO;

1801

1702

}

1802

1703

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

1704

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

1805

1705

ret_errno = errno;

1806

1706

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

1807

1707

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

1808

errno = old_errno;

1809

1708

return ret_errno;

1810

1709

}

1811

1710

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

1812

1711

1813

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

1814

if(sd == -1){

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1815

1714

ret_errno = errno;

1816

1715

perror_plus("socket");

1817

1716

errno = old_errno;

1823

1722

interface);

1824

1723

}

1825

1724

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

}

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

1844

1733

1845

1734

/* Close the socket */

1846

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

1735

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

1847

1736

if(ret == -1){

1848

1737

perror_plus("close");

1849

1738

}

1850

1739

1851

1740

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1741

errno = ret_errno;

1853

1742

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

1743

errno = old_errno;

1855

return ioctl_errno;

1744

return ret_errno;

1856

1745

}

1857

1746

} else if(debug){

1858

1747

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

1866

1755

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

1867

1756

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

1868

1757

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1758

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

1871

1759

AvahiSServiceBrowser *sb = NULL;

1872

1760

error_t ret_errno;

1873

1761

int ret;

1874

1762

intmax_t tmpmax;

1875

1763

char *tmp;

1876

1764

int exitcode = EXIT_SUCCESS;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

1877

1767

char *interfaces_to_take_down = NULL;

1878

1768

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;

1769

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

1770

bool tempdir_created = false;

1882

1771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1883

1772

const char *seckey = PATHDIR "/" SECKEY;

1884

1773

const char *pubkey = PATHDIR "/" PUBKEY;

1885

1774

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

1886

1776

1887

1777

bool gnutls_initialized = false;

1888

1778

bool gpgme_initialized = false;

1979

1869

connect_to = arg;

1980

1870

break;

1981

1871

case 'i': /* --interface */

1982

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

1983

arg, (int)',');

1872

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1873

(int)',');

1984

1874

if(ret_errno != 0){

1985

1875

argp_error(state, "%s", strerror(ret_errno));

1986

1876

}

2066

1956

/* Work around Debian bug #633582:

2067

1957

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

2068

1958

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 {

1959

/* Re-raise priviliges */

1960

if(raise_privileges() == 0){

2075

1961

struct stat st;

2076

1962

2077

1963

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

2117

2003

}

2118

2004

2119

2005

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2006

errno = 0;

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2124

2010

}

2125

2011

}

2126

2012

}

2127

2013

2128

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

2014

/* Remove empty interface names */

2129

2015

{

2130

2016

char *interface = NULL;

2131

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

2017

while((interface = argz_next(interfaces, interfaces_size,

2132

2018

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2019

if(if_nametoindex(interface) == 0){

2020

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

2136

2021

fprintf_plus(stderr, "Not using nonexisting interface"

2137

2022

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

2138

2023

}

2139

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2024

argz_delete(&interfaces, &interfaces_size, interface);

2140

2025

interface = NULL;

2141

2026

}

2142

2027

}

2144

2029

2145

2030

/* Run network hooks */

2146

2031

{

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2149

2035

if(interfaces_hooks == NULL){

2150

2036

perror_plus("malloc");

2151

2037

goto end;

2152

2038

}

2153

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);

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

2158

2048

}

2159

2049

2160

2050

if(not debug){

2237

2127

}

2238

2128

2239

2129

/* If no interfaces were specified, make a list */

2240

if(mc.interfaces == NULL){

2130

if(interfaces == NULL){

2241

2131

struct dirent **direntries;

2242

2132

/* Look for any good interfaces */

2243

2133

ret = scandir(sys_class_net, &direntries, good_interface,

2245

2135

if(ret >= 1){

2246

2136

/* Add all found interfaces to interfaces list */

2247

2137

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

2248

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2249

2139

direntries[i]->d_name);

2250

2140

if(ret_errno != 0){

2251

errno = ret_errno;

2252

2141

perror_plus("argz_add");

2253

2142

continue;

2254

2143

}

2266

2155

}

2267

2156

}

2268

2157

2269

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

2270

{

2158

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

2159

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

2160

if(debug){

2161

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

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

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

2169

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

2271

2170

char *interface = NULL;

2272

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

2171

while((interface = argz_next(interfaces, interfaces_size,

2273

2172

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

2173

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2174

ret = bring_up_interface(interface, delay);

2292

2175

if(not interface_was_up){

2293

if(errno != 0){

2176

if(ret != 0){

2177

errno = ret;

2294

2178

perror_plus("Failed to bring up interface");

2295

2179

} 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

}

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2302

2183

}

2303

2184

}

2304

2185

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2305

2189

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

2306

2190

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

2307

2191

}

2308

2192

}

2309

2193

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

2194

if(quit_now){

2320

2195

goto end;

2321

2196

}

2333

2208

goto end;

2334

2209

}

2335

2210

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){

2211

if(mkdtemp(tempdir) == NULL){

2346

2212

perror_plus("mkdtemp");

2347

2213

goto end;

2348

2214

}

2215

tempdir_created = true;

2349

2216

2350

2217

if(quit_now){

2351

2218

goto end;

2387

2254

exitcode = EX_USAGE;

2388

2255

goto end;

2389

2256

}

2390

2257

2391

2258

if(quit_now){

2392

2259

goto end;

2393

2260

}

2423

2290

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

2424

2291

(int)retry_interval);

2425

2292

}

2426

sleep((unsigned int)retry_interval);

2293

sleep((int)retry_interval);

2427

2294

}

2428

2295

2429

if(not quit_now){

2296

if (not quit_now){

2430

2297

exitcode = EXIT_SUCCESS;

2431

2298

}

2432

2299

2487

2354

if(debug){

2488

2355

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

2489

2356

}

2490

2357

2491

2358

ret = avahi_loop_with_timeout(simple_poll,

2492

2359

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

2493

2360

if(debug){

2502

2369

}

2503

2370

2504

2371

/* Cleanup things */

2505

free(mc.interfaces);

2506

2507

2372

if(sb != NULL)

2508

2373

avahi_s_service_browser_free(sb);

2509

2374

2534

2399

}

2535

2400

}

2536

2401

2537

/* Re-raise privileges */

2402

/* Re-raise priviliges */

2538

2403

{

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

}

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2420

}

2421

}

2422

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

2423

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

2424

" down\n");

2425

}

2426

}

2427

2428

lower_privileges_permanently();

2571

2429

}

2572

2430

2573

2431

free(interfaces_to_take_down);

2574

2432

free(interfaces_hooks);

2575

2433

2576

2434

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

2577

if(tempdir != NULL){

2435

if(tempdir_created){

2578

2436

struct dirent **direntries = NULL;

2579

2437

struct dirent *direntry = NULL;

2580

2438

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

2581

2439

alphasort);

2582

if(numentries > 0){

2440

if (numentries > 0){

2583

2441

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

2584

2442

direntry = direntries[i];

2585

2443

char *fullname = NULL;

2597

2455

free(fullname);

2598

2456

}

2599

2457

}

2600

2458

2601

2459

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

2602

2460

free(direntries);

2603

if(numentries == -1){

2461

if (numentries == -1){

2604

2462

perror_plus("scandir");

2605

2463

}

2606

2464

ret = rmdir(tempdir);