/mandos/trunk : revision 689

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()

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62

*/

73

74

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

74

75

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

75

76

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

76

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

77

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

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

91

92

argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

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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() */

161

164

const char *priority;

162

165

gpgme_ctx_t ctx;

163

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

164

169

} mandos_context;

165

170

166

171

/* global so signal handler can reach it*/

178

183

perror(print_text);

179

184

}

180

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181

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

186

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

182

187

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

183

188

va_list ap;

184

189

va_start (ap, format);

185

190

186

191

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

187

192

program_invocation_short_name));

188

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

193

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

189

194

}

190

195

191

196

/*

193

198

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

194

199

* "buffer_length" is how much is already used.

195

200

*/

201

__attribute__((nonnull, warn_unused_result))

196

202

size_t incbuffer(char **buffer, size_t buffer_length,

197

203

size_t buffer_capacity){

198

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

199

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

200

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;

201

211

return 0;

202

212

}

213

*buffer = new_buf;

203

214

buffer_capacity += BUFFER_SIZE;

204

215

}

205

216

return buffer_capacity;

206

217

}

207

218

208

219

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

220

__attribute__((nonnull, warn_unused_result))

209

221

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

210

222

int af, server **current_server){

211

223

int ret;

222

234

perror_plus("strdup");

223

235

return false;

224

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

225

242

/* Special case of first server */

226

243

if(*current_server == NULL){

227

244

new_server->next = new_server;

228

245

new_server->prev = new_server;

229

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*current_server = new_server;

230

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

231

247

} else {

248

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

232

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new_server->next = *current_server;

233

250

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

234

251

new_server->prev->next = new_server;

235

252

(*current_server)->prev = new_server;

236

253

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

254

return true;

243

255

}

244

256

245

257

/*

246

258

* Initialize GPGME.

247

259

*/

248

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

249

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){

250

265

gpgme_error_t rc;

251

266

gpgme_engine_info_t engine_info;

252

267

253

268

/*

254

269

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

255

270

*/

256

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

257

272

int ret;

258

273

int fd;

259

274

gpgme_data_t pgp_data;

340

355

* Decrypt OpenPGP data.

341

356

* Returns -1 on error

342

357

*/

358

__attribute__((nonnull, warn_unused_result))

343

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

360

size_t crypto_size,

345

361

char **plaintext,

465

481

return plaintext_length;

466

482

}

467

483

468

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

469

486

const char *ret = gnutls_strerror(value);

470

487

if(ret == NULL)

471

488

ret = "(unknown)";

473

490

}

474

491

475

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

476

494

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

477

495

const char* string){

478

496

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

479

497

}

480

498

499

__attribute__((nonnull, warn_unused_result))

481

500

static int init_gnutls_global(const char *pubkeyfilename,

482

501

const char *seckeyfilename,

483

502

mandos_context *mc){

557

576

return -1;

558

577

}

559

578

579

__attribute__((nonnull, warn_unused_result))

560

580

static int init_gnutls_session(gnutls_session_t *session,

561

581

mandos_context *mc){

562

582

int ret;

619

639

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

620

640

621

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

622

643

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

623

644

AvahiIfIndex if_index,

624

645

int af, mandos_context *mc){

625

646

int ret, tcp_sd = -1;

626

647

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

648

struct sockaddr_storage to;

631

649

char *buffer = NULL;

632

650

char *decrypted_buffer = NULL;

633

651

size_t buffer_length = 0;

657

675

return -1;

658

676

}

659

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

660

710

ret = init_gnutls_session(&session, mc);

661

711

if(ret != 0){

662

712

return -1;

682

732

683

733

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

684

734

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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);

687

737

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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);

690

740

}

691

741

if(ret < 0 ){

692

742

int e = errno;

701

751

goto mandos_end;

702

752

}

703

753

if(af == AF_INET6){

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*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

708

757

if(if_index == AVAHI_IF_UNSPEC){

709

758

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

710

759

" incomplete without a network interface\n");

712

761

goto mandos_end;

713

762

}

714

763

/* Set the network interface number as scope */

715

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

716

765

}

717

766

} else {

718

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

719

-Wconversion and

720

-Wunreachable-code */

767

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

721

768

}

722

769

723

770

if(quit_now){

740

787

}

741

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

742

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

744

790

if(af == AF_INET6){

745

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

746

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

747

795

} else {

748

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

749

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

750

800

}

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

}

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);

757

807

}

758

808

}

759

809

763

813

}

764

814

765

815

if(af == AF_INET6){

766

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

816

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

817

sizeof(struct sockaddr_in6));

767

818

} else {

768

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

819

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

820

sizeof(struct sockaddr_in));

769

821

}

770

822

if(ret < 0){

771

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

823

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

772

824

int e = errno;

773

825

perror_plus("connect");

774

826

errno = e;

989

1041

return retval;

990

1042

}

991

1043

1044

__attribute__((nonnull))

992

1045

static void resolve_callback(AvahiSServiceResolver *r,

993

1046

AvahiIfIndex interface,

994

1047

AvahiProtocol proto,

1002

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1003

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1004

1057

flags,

1005

void* mc){

1058

void *mc){

1006

1059

if(r == NULL){

1007

1060

return;

1008

1061

}

1061

1114

const char *domain,

1062

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1063

1116

flags,

1064

void* mc){

1117

void *mc){

1065

1118

if(b == NULL){

1066

1119

return;

1067

1120

}

1127

1180

errno = old_errno;

1128

1181

}

1129

1182

1183

__attribute__((nonnull, warn_unused_result))

1130

1184

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

1131

1185

int ret;

1132

1186

error_t ret_errno;

1151

1205

return true;

1152

1206

}

1153

1207

1208

__attribute__((nonnull, warn_unused_result))

1154

1209

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

1155

1210

1156

1211

/* Reject the loopback device */

1198

1253

* corresponds to an acceptable network device.

1199

1254

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

1200

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1201

1257

int good_interface(const struct dirent *if_entry){

1202

1258

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

1203

1259

return 0;

1221

1277

/*

1222

1278

* This function determines if a network interface is up.

1223

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1224

1281

bool interface_is_up(const char *interface){

1225

1282

struct ifreq ifr;

1226

1283

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

1237

1294

/*

1238

1295

* This function determines if a network interface is running

1239

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1240

1298

bool interface_is_running(const char *interface){

1241

1299

struct ifreq ifr;

1242

1300

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

1250

1308

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

1251

1309

}

1252

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1253

1312

int notdotentries(const struct dirent *direntry){

1254

1313

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

1255

1314

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

1262

1321

}

1263

1322

1264

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1265

1325

int runnable_hook(const struct dirent *direntry){

1266

1326

int ret;

1267

1327

size_t sret;

1275

1335

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

1276

1336

"abcdefghijklmnopqrstuvwxyz"

1277

1337

"0123456789"

1278

"_-");

1338

"_.-");

1279

1339

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

1280

1340

/* Contains non-allowed characters */

1281

1341

if(debug){

1299

1359

}

1300

1360

return 0;

1301

1361

}

1362

free(fullname);

1302

1363

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

1303

1364

/* Not a regular file */

1304

1365

if(debug){

1322

1383

return 1;

1323

1384

}

1324

1385

1386

__attribute__((nonnull, warn_unused_result))

1325

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1326

1388

mandos_context *mc){

1327

1389

int ret;

1331

1393

1332

1394

while(true){

1333

1395

if(mc->current_server == NULL){

1334

if (debug){

1396

if(debug){

1335

1397

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

1336

1398

" No timeout!\n");

1337

1399

}

1338

1400

ret = avahi_simple_poll_iterate(s, -1);

1339

1401

} else {

1340

if (debug){

1402

if(debug){

1341

1403

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

1342

1404

" it, or wait\n");

1343

1405

}

1360

1422

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

1361

1423

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

1362

1424

1363

if (debug){

1425

if(debug){

1364

1426

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

1365

1427

block_time);

1366

1428

}

1388

1450

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

1389

1451

}

1390

1452

if(ret != 0){

1391

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

1453

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

1392

1454

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

1393

1455

}

1394

1456

}

1396

1458

}

1397

1459

1398

1460

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

1461

__attribute__((warn_unused_result))

1399

1462

error_t raise_privileges(void){

1400

1463

error_t old_errno = errno;

1401

1464

error_t ret_errno = 0;

1408

1471

}

1409

1472

1410

1473

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

1474

__attribute__((warn_unused_result))

1411

1475

error_t raise_privileges_permanently(void){

1412

1476

error_t old_errno = errno;

1413

1477

error_t ret_errno = raise_privileges();

1424

1488

}

1425

1489

1426

1490

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

1491

__attribute__((warn_unused_result))

1427

1492

error_t lower_privileges(void){

1428

1493

error_t old_errno = errno;

1429

1494

error_t ret_errno = 0;

1436

1501

}

1437

1502

1438

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1439

1505

error_t lower_privileges_permanently(void){

1440

1506

error_t old_errno = errno;

1441

1507

error_t ret_errno = 0;

1447

1513

return ret_errno;

1448

1514

}

1449

1515

1450

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

1516

__attribute__((nonnull))

1517

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

1451

1518

const float delay){

1452

1519

struct dirent **direntries;

1453

struct dirent *direntry;

1454

int ret;

1455

1520

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

1456

1521

alphasort);

1457

1522

if(numhooks == -1){

1464

1529

perror_plus("scandir");

1465

1530

}

1466

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1467

1534

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

1468

1535

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

1469

1536

direntry = direntries[i];

1481

1548

if(hook_pid == 0){

1482

1549

/* Child */

1483

1550

/* Raise privileges */

1484

raise_privileges_permanently();

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1485

1555

/* Set group */

1486

1556

errno = 0;

1487

1557

ret = setgid(0);

1488

1558

if(ret == -1){

1489

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1490

1561

}

1491

1562

/* Reset supplementary groups */

1492

1563

errno = 0;

1493

1564

ret = setgroups(0, NULL);

1494

1565

if(ret == -1){

1495

1566

perror_plus("setgroups");

1496

}

1497

dup2(devnull, STDIN_FILENO);

1498

close(devnull);

1499

dup2(STDERR_FILENO, STDOUT_FILENO);

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1500

1584

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

1501

1585

if(ret == -1){

1502

1586

perror_plus("setenv");

1518

1602

_exit(EX_OSERR);

1519

1603

}

1520

1604

char *delaystring;

1521

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

1605

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

1522

1606

if(ret == -1){

1523

1607

perror_plus("asprintf");

1524

1608

_exit(EX_OSERR);

1577

1661

}

1578

1662

close(devnull);

1579

1663

}

1580

return true;

1581

1664

}

1582

1665

1666

__attribute__((nonnull, warn_unused_result))

1583

1667

error_t bring_up_interface(const char *const interface,

1584

1668

const float delay){

1585

int sd = -1;

1586

1669

error_t old_errno = errno;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1670

int ret;

1589

1671

struct ifreq network;

1590

1672

unsigned int if_index = if_nametoindex(interface);

1591

1673

if(if_index == 0){

1600

1682

}

1601

1683

1602

1684

if(not interface_is_up(interface)){

1603

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

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1604

1687

ret_errno = errno;

1605

1688

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

1606

1689

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

1690

errno = old_errno;

1607

1691

return ret_errno;

1608

1692

}

1609

network.ifr_flags |= IFF_UP;

1693

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

1610

1694

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1695

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

1696

if(sd == -1){

1613

1697

ret_errno = errno;

1614

1698

perror_plus("socket");

1615

1699

errno = old_errno;

1616

1700

return ret_errno;

1617

1701

}

1618

1702

1619

1703

if(quit_now){

1620

close(sd);

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1621

1708

errno = old_errno;

1622

1709

return EINTR;

1623

1710

}

1627

1714

interface);

1628

1715

}

1629

1716

1630

/* Raise priviliges */

1631

raise_privileges();

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1632

1722

1633

1723

#ifdef __linux__

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");

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

}

1641

1735

}

1642

1736

#endif /* __linux__ */

1643

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

1644

ret_errno = errno;

1737

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

1738

ioctl_errno = errno;

1645

1739

#ifdef __linux__

1646

1740

if(restore_loglevel){

1647

1741

ret_linux = klogctl(7, NULL, 0);

1651

1745

}

1652

1746

#endif /* __linux__ */

1653

1747

1654

/* Lower privileges */

1655

lower_privileges();

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1656

1757

1657

1758

/* Close the socket */

1658

1759

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

1661

1762

}

1662

1763

1663

1764

if(ret_setflags == -1){

1664

errno = ret_errno;

1765

errno = ioctl_errno;

1665

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1666

1767

errno = old_errno;

1667

return ret_errno;

1768

return ioctl_errno;

1668

1769

}

1669

1770

} else if(debug){

1670

1771

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

1688

1789

return 0;

1689

1790

}

1690

1791

1792

__attribute__((nonnull, warn_unused_result))

1691

1793

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1693

1794

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1696

1795

struct ifreq network;

1697

1796

unsigned int if_index = if_nametoindex(interface);

1698

1797

if(if_index == 0){

1701

1800

return ENXIO;

1702

1801

}

1703

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1704

1804

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

1705

1805

ret_errno = errno;

1706

1806

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

1707

1807

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

1808

errno = old_errno;

1708

1809

return ret_errno;

1709

1810

}

1710

1811

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

1711

1812

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1813

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

1814

if(sd == -1){

1714

1815

ret_errno = errno;

1715

1816

perror_plus("socket");

1716

1817

errno = old_errno;

1722

1823

interface);

1723

1824

}

1724

1825

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();

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

}

1733

1844

1734

1845

/* Close the socket */

1735

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

1846

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

1736

1847

if(ret == -1){

1737

1848

perror_plus("close");

1738

1849

}

1739

1850

1740

1851

if(ret_setflags == -1){

1741

errno = ret_errno;

1852

errno = ioctl_errno;

1742

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1743

1854

errno = old_errno;

1744

return ret_errno;

1855

return ioctl_errno;

1745

1856

}

1746

1857

} else if(debug){

1747

1858

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

1755

1866

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

1756

1867

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

1757

1868

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

1758

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1759

1871

AvahiSServiceBrowser *sb = NULL;

1760

1872

error_t ret_errno;

1761

1873

int ret;

1762

1874

intmax_t tmpmax;

1763

1875

char *tmp;

1764

1876

int exitcode = EXIT_SUCCESS;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

1767

1877

char *interfaces_to_take_down = NULL;

1768

1878

size_t interfaces_to_take_down_size = 0;

1769

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

1770

bool tempdir_created = false;

1879

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

1880

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

1881

char *tempdir = NULL;

1771

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1772

1883

const char *seckey = PATHDIR "/" SECKEY;

1773

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1774

1885

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

1776

1886

1777

1887

bool gnutls_initialized = false;

1778

1888

bool gpgme_initialized = false;

1869

1979

connect_to = arg;

1870

1980

break;

1871

1981

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

1872

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

1873

(int)',');

1982

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

1983

arg, (int)',');

1874

1984

if(ret_errno != 0){

1875

1985

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

1876

1986

}

1956

2066

/* Work around Debian bug #633582:

1957

2067

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

1958

2068

1959

/* Re-raise priviliges */

1960

if(raise_privileges() == 0){

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1961

2075

struct stat st;

1962

2076

1963

2077

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

2003

2117

}

2004

2118

2005

2119

/* Lower privileges */

2006

errno = 0;

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2010

2124

}

2011

2125

}

2012

2126

}

2013

2127

2014

/* Remove empty interface names */

2128

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

2015

2129

{

2016

2130

char *interface = NULL;

2017

while((interface = argz_next(interfaces, interfaces_size,

2131

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

2018

2132

interface))){

2019

if(if_nametoindex(interface) == 0){

2020

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

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2021

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2022

2137

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

2023

2138

}

2024

argz_delete(&interfaces, &interfaces_size, interface);

2139

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

2025

2140

interface = NULL;

2026

2141

}

2027

2142

}

2029

2144

2030

2145

/* Run network hooks */

2031

2146

{

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2035

2149

if(interfaces_hooks == NULL){

2036

2150

perror_plus("malloc");

2037

2151

goto end;

2038

2152

}

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

}

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);

2048

2158

}

2049

2159

2050

2160

if(not debug){

2127

2237

}

2128

2238

2129

2239

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

2130

if(interfaces == NULL){

2240

if(mc.interfaces == NULL){

2131

2241

struct dirent **direntries;

2132

2242

/* Look for any good interfaces */

2133

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2135

2245

if(ret >= 1){

2136

2246

/* Add all found interfaces to interfaces list */

2137

2247

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2248

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

2139

2249

direntries[i]->d_name);

2140

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2141

2252

perror_plus("argz_add");

2142

2253

continue;

2143

2254

}

2155

2266

}

2156

2267

}

2157

2268

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)){

2269

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

2270

{

2170

2271

char *interface = NULL;

2171

while((interface = argz_next(interfaces, interfaces_size,

2272

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

2172

2273

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

2286

}

2287

}

2288

break;

2289

}

2173

2290

bool interface_was_up = interface_is_up(interface);

2174

ret = bring_up_interface(interface, delay);

2291

errno = bring_up_interface(interface, delay);

2175

2292

if(not interface_was_up){

2176

if(ret != 0){

2177

errno = ret;

2293

if(errno != 0){

2178

2294

perror_plus("Failed to bring up interface");

2179

2295

} else {

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

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

}

2183

2302

}

2184

2303

}

2185

2304

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2189

2305

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

2190

2306

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

2191

2307

}

2192

2308

}

2193

2309

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

2194

2319

if(quit_now){

2195

2320

goto end;

2196

2321

}

2208

2333

goto end;

2209

2334

}

2210

2335

2211

if(mkdtemp(tempdir) == NULL){

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2212

2346

perror_plus("mkdtemp");

2213

2347

goto end;

2214

2348

}

2215

tempdir_created = true;

2216

2349

2217

2350

if(quit_now){

2218

2351

goto end;

2254

2387

exitcode = EX_USAGE;

2255

2388

goto end;

2256

2389

}

2257

2390

2258

2391

if(quit_now){

2259

2392

goto end;

2260

2393

}

2290

2423

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

2291

2424

(int)retry_interval);

2292

2425

}

2293

sleep((int)retry_interval);

2426

sleep((unsigned int)retry_interval);

2294

2427

}

2295

2428

2296

if (not quit_now){

2429

if(not quit_now){

2297

2430

exitcode = EXIT_SUCCESS;

2298

2431

}

2299

2432

2354

2487

if(debug){

2355

2488

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

2356

2489

}

2357

2490

2358

2491

ret = avahi_loop_with_timeout(simple_poll,

2359

2492

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

2360

2493

if(debug){

2369

2502

}

2370

2503

2371

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

2372

2507

if(sb != NULL)

2373

2508

avahi_s_service_browser_free(sb);

2374

2509

2399

2534

}

2400

2535

}

2401

2536

2402

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2403

2538

{

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();

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

}

2429

2571

}

2430

2572

2431

2573

free(interfaces_to_take_down);

2432

2574

free(interfaces_hooks);

2433

2575

2434

2576

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

2435

if(tempdir_created){

2577

if(tempdir != NULL){

2436

2578

struct dirent **direntries = NULL;

2437

2579

struct dirent *direntry = NULL;

2438

2580

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

2439

2581

alphasort);

2440

if (numentries > 0){

2582

if(numentries > 0){

2441

2583

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

2442

2584

direntry = direntries[i];

2443

2585

char *fullname = NULL;

2455

2597

free(fullname);

2456

2598

}

2457

2599

}

2458

2600

2459

2601

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

2460

2602

free(direntries);

2461

if (numentries == -1){

2603

if(numentries == -1){

2462

2604

perror_plus("scandir");

2463

2605

}

2464

2606

ret = rmdir(tempdir);