/mandos/release : revision 237.16.17

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

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

61

*/

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

64

#include <assert.h> /* assert() */

64

65

#include <errno.h> /* perror(), errno,

65

66

program_invocation_short_name */

66

67

#include <time.h> /* nanosleep(), time(), sleep() */

87

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

88

89

WEXITSTATUS(), WTERMSIG() */

89

90

#include <grp.h> /* setgroups() */

90

#include <argz.h> /* argz_add_sep(), argz_next(),

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

94

91

95

92

#ifdef __linux__

96

93

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

138

135

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

139

136

char *connect_to = NULL;

140

137

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

143

138

144

139

/* Doubly linked list that need to be circularly linked when used */

145

140

typedef struct server{

146

141

const char *ip;

147

in_port_t port;

142

uint16_t port;

148

143

AvahiIfIndex if_index;

149

144

int af;

150

145

struct timespec last_seen;

154

149

155

150

/* Used for passing in values through the Avahi callback functions */

156

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

157

153

AvahiServer *server;

158

154

gnutls_certificate_credentials_t cred;

159

155

unsigned int dh_bits;

163

159

server *current_server;

164

160

} mandos_context;

165

161

166

/* global so signal handler can reach it*/

167

AvahiSimplePoll *simple_poll;

168

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

169

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

170

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

162

/* global context so signal handler can reach it*/

163

mandos_context mc = { .simple_poll = NULL, .server = NULL,

164

.dh_bits = 1024, .priority = "SECURE256"

165

":!CTYPE-X.509:+CTYPE-OPENPGP",

166

.current_server = NULL };

171

167

172

168

sig_atomic_t quit_now = 0;

173

169

int signal_received = 0;

174

170

175

171

/* Function to use when printing errors */

176

172

void perror_plus(const char *print_text){

177

int e = errno;

178

173

fprintf(stderr, "Mandos plugin %s: ",

179

174

program_invocation_short_name);

180

errno = e;

181

175

perror(print_text);

182

176

}

183

177

184

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

185

178

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

186

179

va_list ap;

187

180

va_start (ap, format);

209

202

}

210

203

211

204

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

212

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

213

int af){

205

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

206

int af){

214

207

int ret;

215

208

server *new_server = malloc(sizeof(server));

216

209

if(new_server == NULL){

217

210

perror_plus("malloc");

218

return false;

211

return -1;

219

212

}

220

213

*new_server = (server){ .ip = strdup(ip),

221

214

.port = port,

223

216

.af = af };

224

217

if(new_server->ip == NULL){

225

218

perror_plus("strdup");

226

return false;

219

return -1;

227

220

}

228

221

/* Special case of first server */

229

222

if (mc.current_server == NULL){

240

233

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

241

234

if(ret == -1){

242

235

perror_plus("clock_gettime");

243

return false;

236

return -1;

244

237

}

245

return true;

238

return 0;

246

239

}

247

240

248

241

/*

253

246

gpgme_error_t rc;

254

247

gpgme_engine_info_t engine_info;

255

248

249

256

250

/*

257

251

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

258

252

*/

468

462

}

469

463

470

464

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

465

const char *ret = gnutls_strerror(value); /* Spurious warning from

466

-Wunreachable-code */

472

467

if(ret == NULL)

473

468

ret = "(unknown)";

474

469

return ret;

619

614

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

620

615

621

616

/* Called when a Mandos server is found */

622

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

617

static int start_mandos_communication(const char *ip, uint16_t port,

623

618

AvahiIfIndex if_index,

624

619

int af){

625

620

int ret, tcp_sd = -1;

664

659

665

660

if(debug){

666

661

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

667

PRIuMAX "\n", ip, (uintmax_t)port);

662

PRIu16 "\n", ip, port);

668

663

}

669

664

670

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

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696

goto mandos_end;

702

697

}

703

698

if(af == AF_INET6){

704

to.in6.sin6_port = htons(port);

699

to.in6.sin6_port = htons(port); /* Spurious warnings from

700

-Wconversion and

701

-Wunreachable-code */

702

705

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

704

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

707

705

-Wunreachable-code*/

731

729

if(if_indextoname((unsigned int)if_index, interface) == NULL){

732

730

perror_plus("if_indextoname");

733

731

} else {

734

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

735

"\n", ip, interface, (uintmax_t)port);

732

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

733

"\n", ip, interface, port);

736

734

}

737

735

} else {

738

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

739

ip, (uintmax_t)port);

736

fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",

737

ip, port);

740

738

}

741

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

742

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

820

818

goto mandos_end;

821

819

}

822

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823

/* This casting via intptr_t is to eliminate warning about casting

824

an int to a pointer type. This is exactly how the GnuTLS Guile

825

function "set-session-transport-fd!" does it. */

826

gnutls_transport_set_ptr(session,

827

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

/* Spurious warning from -Wint-to-pointer-cast */

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

828

823

829

824

if(quit_now){

830

825

errno = EINTR;

1003

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1004

999

flags,

1005

1000

AVAHI_GCC_UNUSED void* userdata){

1006

if(r == NULL){

1007

return;

1008

}

1001

assert(r);

1009

1002

1010

1003

/* Called whenever a service has been resolved successfully or

1011

1004

timed out */

1032

1025

PRIdMAX ") on port %" PRIu16 "\n", name,

1033

1026

host_name, ip, (intmax_t)interface, port);

1034

1027

}

1035

int ret = start_mandos_communication(ip, (in_port_t)port,

1036

interface,

1028

int ret = start_mandos_communication(ip, port, interface,

1037

1029

avahi_proto_to_af(proto));

1038

1030

if(ret == 0){

1039

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1040

1032

} else {

1041

if(not add_server(ip, (in_port_t)port, interface,

1042

avahi_proto_to_af(proto))){

1043

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1044

" list\n", name);

1045

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1046

1035

}

1047

1036

}

1048

1037

}

1059

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1049

flags,

1061

1050

AVAHI_GCC_UNUSED void* userdata){

1062

if(b == NULL){

1063

return;

1064

}

1051

assert(b);

1065

1052

1066

1053

/* Called whenever a new services becomes available on the LAN or

1067

1054

is removed from the LAN */

1076

1063

1077

1064

fprintf_plus(stderr, "(Avahi browser) %s\n",

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1065

avahi_strerror(avahi_server_errno(mc.server)));

1079

avahi_simple_poll_quit(simple_poll);

1066

avahi_simple_poll_quit(mc.simple_poll);

1080

1067

return;

1081

1068

1082

1069

case AVAHI_BROWSER_NEW:

1115

1102

signal_received = sig;

1116

1103

int old_errno = errno;

1117

1104

/* set main loop to exit */

1118

if(simple_poll != NULL){

1119

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1120

1107

}

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1108

errno = old_errno;

1122

1109

}

1123

1110

1124

1111

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

1125

1112

int ret;

1126

error_t ret_errno;

1127

1113

1128

1114

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

1129

1115

if(s < 0){

1130

ret_errno = errno;

1131

1116

perror_plus("socket");

1132

errno = ret_errno;

1133

1117

return false;

1134

1118

}

1135

1119

strcpy(ifr->ifr_name, ifname);

1136

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1137

1121

if(ret == -1){

1138

1122

if(debug){

1139

ret_errno = errno;

1140

1123

perror_plus("ioctl SIOCGIFFLAGS");

1141

errno = ret_errno;

1142

1124

}

1143

1125

return false;

1144

1126

}

1213

1195

}

1214

1196

1215

1197

/*

1216

* This function determines if a network interface is up.

1217

*/

1218

bool interface_is_up(const char *interface){

1219

struct ifreq ifr;

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return false;

1226

}

1227

1228

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

1229

}

1230

1231

/*

1232

* This function determines if a network interface is running

1233

*/

1234

bool interface_is_running(const char *interface){

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

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

1240

}

1241

return false;

1242

}

1243

1244

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

1198

* This function determines if a directory entry in /sys/class/net

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

if(not get_flags(if_entry->d_name, &ifr)){

1209

if(debug){

1210

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

1211

"\"%s\"\n", if_entry->d_name);

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

if(not (ifr.ifr_flags & IFF_UP)){

1218

if(debug){

1219

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

if(not (ifr.ifr_flags & IFF_RUNNING)){

1227

if(debug){

1228

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

if(not good_flags(if_entry->d_name, &ifr)){

1235

return 0;

1236

}

1237

return 1;

1245

1238

}

1246

1239

1247

1240

int notdotentries(const struct dirent *direntry){

1364

1357

mc.current_server->if_index,

1365

1358

mc.current_server->af);

1366

1359

if(ret == 0){

1367

avahi_simple_poll_quit(simple_poll);

1360

avahi_simple_poll_quit(mc.simple_poll);

1368

1361

return 0;

1369

1362

}

1370

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1388

1381

}

1389

1382

}

1390

1383

1391

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

1392

error_t raise_privileges(void){

1393

error_t old_errno = errno;

1394

error_t ret_errno = 0;

1395

if(seteuid(0) == -1){

1396

ret_errno = errno;

1397

perror_plus("seteuid");

1398

}

1399

errno = old_errno;

1400

return ret_errno;

1401

}

1402

1403

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

1404

error_t raise_privileges_permanently(void){

1405

error_t old_errno = errno;

1406

error_t ret_errno = raise_privileges();

1407

if(ret_errno != 0){

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

if(setuid(0) == -1){

1412

ret_errno = errno;

1413

perror_plus("seteuid");

1414

}

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

1419

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

1420

error_t lower_privileges(void){

1421

error_t old_errno = errno;

1422

error_t ret_errno = 0;

1423

if(seteuid(uid) == -1){

1424

ret_errno = errno;

1425

perror_plus("seteuid");

1426

}

1427

errno = old_errno;

1428

return ret_errno;

1429

}

1430

1431

/* Lower privileges permanently */

1432

error_t lower_privileges_permanently(void){

1433

error_t old_errno = errno;

1434

error_t ret_errno = 0;

1435

if(setuid(uid) == -1){

1436

ret_errno = errno;

1437

perror_plus("setuid");

1438

}

1439

errno = old_errno;

1440

return ret_errno;

1441

}

1442

1443

1384

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

1444

1385

const float delay){

1445

1386

struct dirent **direntries;

1448

1389

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

1449

1390

alphasort);

1450

1391

if(numhooks == -1){

1451

if(errno == ENOENT){

1452

if(debug){

1453

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

1454

" found\n", hookdir);

1455

}

1456

} else {

1457

perror_plus("scandir");

1458

}

1392

perror_plus("scandir");

1459

1393

} else {

1460

1394

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

1461

1395

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

1474

1408

if(hook_pid == 0){

1475

1409

/* Child */

1476

1410

/* Raise privileges */

1477

raise_privileges_permanently();

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1478

1422

/* Set group */

1479

1423

errno = 0;

1480

1424

ret = setgid(0);

1487

1431

if(ret == -1){

1488

1432

perror_plus("setgroups");

1489

1433

}

1434

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1490

1436

dup2(devnull, STDIN_FILENO);

1491

1437

close(devnull);

1492

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1500

1446

perror_plus("setenv");

1501

1447

_exit(EX_OSERR);

1502

1448

}

1503

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

1449

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

1504

1450

if(ret == -1){

1505

1451

perror_plus("setenv");

1506

1452

_exit(EX_OSERR);

1523

1469

_exit(EX_OSERR);

1524

1470

}

1525

1471

free(delaystring);

1526

if(connect_to != NULL){

1527

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

1528

if(ret == -1){

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1532

}

1533

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

1534

perror_plus("execl");

1535

_exit(EXIT_FAILURE);

1536

}

1472

ret = execl(fullname, direntry->d_name, mode, NULL);

1473

perror_plus("execl");

1537

1474

} else {

1538

1475

int status;

1539

1476

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

1573

1510

return true;

1574

1511

}

1575

1512

1576

error_t bring_up_interface(const char *const interface,

1577

const float delay){

1578

int sd = -1;

1579

error_t old_errno = errno;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1582

struct ifreq network;

1583

unsigned int if_index = if_nametoindex(interface);

1584

if(if_index == 0){

1585

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1586

errno = old_errno;

1587

return ENXIO;

1588

}

1589

1590

if(quit_now){

1591

errno = old_errno;

1592

return EINTR;

1593

}

1594

1595

if(not interface_is_up(interface)){

1596

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

1597

ret_errno = errno;

1598

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

1599

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

1600

return ret_errno;

1601

}

1602

network.ifr_flags |= IFF_UP;

1603

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1606

ret_errno = errno;

1607

perror_plus("socket");

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

if(quit_now){

1613

close(sd);

1614

errno = old_errno;

1615

return EINTR;

1616

}

1617

1618

if(debug){

1619

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1620

interface);

1621

}

1622

1623

/* Raise priviliges */

1624

raise_privileges();

1625

1626

#ifdef __linux__

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

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

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1634

}

1635

#endif /* __linux__ */

1636

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

1637

ret_errno = errno;

1638

#ifdef __linux__

1639

if(restore_loglevel){

1640

ret_linux = klogctl(7, NULL, 0);

1641

if(ret_linux == -1){

1642

perror_plus("klogctl");

1643

}

1644

}

1645

#endif /* __linux__ */

1646

1647

/* Lower privileges */

1648

lower_privileges();

1649

1650

/* Close the socket */

1651

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

1652

if(ret == -1){

1653

perror_plus("close");

1654

}

1655

1656

if(ret_setflags == -1){

1657

errno = ret_errno;

1658

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1659

errno = old_errno;

1660

return ret_errno;

1661

}

1662

} else if(debug){

1663

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

1664

interface);

1665

}

1666

1667

/* Sleep checking until interface is running.

1668

Check every 0.25s, up to total time of delay */

1669

for(int i=0; i < delay * 4; i++){

1670

if(interface_is_running(interface)){

1671

break;

1672

}

1673

struct timespec sleeptime = { .tv_nsec = 250000000 };

1674

ret = nanosleep(&sleeptime, NULL);

1675

if(ret == -1 and errno != EINTR){

1676

perror_plus("nanosleep");

1677

}

1678

}

1679

1680

errno = old_errno;

1681

return 0;

1682

}

1683

1684

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1686

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1689

struct ifreq network;

1690

unsigned int if_index = if_nametoindex(interface);

1691

if(if_index == 0){

1692

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1693

errno = old_errno;

1694

return ENXIO;

1695

}

1696

if(interface_is_up(interface)){

1697

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

1698

ret_errno = errno;

1699

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

1700

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

1701

return ret_errno;

1702

}

1703

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

1704

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1707

ret_errno = errno;

1708

perror_plus("socket");

1709

errno = old_errno;

1710

return ret_errno;

1711

}

1712

1713

if(debug){

1714

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1715

interface);

1716

}

1717

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1726

1727

/* Close the socket */

1728

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

1729

if(ret == -1){

1730

perror_plus("close");

1731

}

1732

1733

if(ret_setflags == -1){

1734

errno = ret_errno;

1735

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1736

errno = old_errno;

1737

return ret_errno;

1738

}

1739

} else if(debug){

1740

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

1741

interface);

1742

}

1743

1744

errno = old_errno;

1745

return 0;

1746

}

1747

1748

1513

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

1749

1514

AvahiSServiceBrowser *sb = NULL;

1750

error_t ret_errno;

1515

int error;

1751

1516

int ret;

1752

1517

intmax_t tmpmax;

1753

1518

char *tmp;

1754

1519

int exitcode = EXIT_SUCCESS;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1757

char *interfaces_to_take_down = NULL;

1758

size_t interfaces_to_take_down_size = 0;

1520

const char *interface = "";

1521

struct ifreq network;

1522

int sd = -1;

1523

bool take_down_interface = false;

1524

uid_t uid;

1525

gid_t gid;

1759

1526

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

1760

1527

bool tempdir_created = false;

1761

1528

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1762

1529

const char *seckey = PATHDIR "/" SECKEY;

1763

1530

const char *pubkey = PATHDIR "/" PUBKEY;

1764

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1766

1531

1767

1532

bool gnutls_initialized = false;

1768

1533

bool gpgme_initialized = false;

1830

1595

.group = 2 },

1831

1596

{ .name = "retry", .key = 132,

1832

1597

.arg = "SECONDS",

1833

.doc = "Retry interval used when denied by the Mandos server",

1598

.doc = "Retry interval used when denied by the mandos server",

1834

1599

.group = 2 },

1835

1600

{ .name = "network-hook-dir", .key = 133,

1836

1601

.arg = "DIR",

1859

1624

connect_to = arg;

1860

1625

break;

1861

1626

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

1862

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

1863

(int)',');

1864

if(ret_errno != 0){

1865

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

1866

}

1627

interface = arg;

1867

1628

break;

1868

1629

case 's': /* --seckey */

1869

1630

seckey = arg;

1912

1673

argp_state_help(state, state->out_stream,

1913

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1914

1675

case 'V': /* --version */

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1915

1678

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1916

1679

exit(argp_err_exit_status);

1917

1680

break;

1947

1710

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

1948

1711

1949

1712

/* Re-raise priviliges */

1950

if(raise_privileges() == 0){

1713

errno = 0;

1714

ret = seteuid(0);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

} else {

1951

1718

struct stat st;

1952

1719

1953

1720

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

2001

1768

}

2002

1769

}

2003

1770

2004

/* Remove empty interface names */

2005

{

2006

char *interface = NULL;

2007

while((interface = argz_next(interfaces, interfaces_size,

2008

interface))){

2009

if(if_nametoindex(interface) == 0){

2010

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

2011

fprintf_plus(stderr, "Not using nonexisting interface"

2012

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

2013

}

2014

argz_delete(&interfaces, &interfaces_size, interface);

2015

interface = NULL;

2016

}

2017

}

2018

}

2019

2020

1771

/* Run network hooks */

2021

{

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2025

if(interfaces_hooks == NULL){

2026

perror_plus("malloc");

2027

goto end;

2028

}

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

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

2035

interfaces_hooks : "", delay)){

2036

goto end;

2037

}

1772

if(not run_network_hooks("start", interface, delay)){

1773

goto end;

2038

1774

}

2039

1775

2040

1776

if(not debug){

2041

1777

avahi_set_log_function(empty_log);

2042

1778

}

2043

1779

1780

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

1781

struct dirent **direntries;

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1784

alphasort);

1785

if(ret == 0){

1786

/* No up interfaces, look for any good interfaces */

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1791

if(ret >= 1){

1792

/* Pick the first interface returned */

1793

interface = strdup(direntries[0]->d_name);

1794

if(debug){

1795

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1796

}

1797

if(interface == NULL){

1798

perror_plus("malloc");

1799

free(direntries);

1800

exitcode = EXIT_FAILURE;

1801

goto end;

1802

}

1803

free(direntries);

1804

} else {

1805

free(direntries);

1806

fprintf_plus(stderr, "Could not find a network interface\n");

1807

exitcode = EXIT_FAILURE;

1808

goto end;

1809

}

1810

}

1811

2044

1812

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

2045

1813

from the signal handler */

2046

1814

/* Initialize the pseudo-RNG for Avahi */

2047

1815

srand((unsigned int) time(NULL));

2048

simple_poll = avahi_simple_poll_new();

2049

if(simple_poll == NULL){

1816

mc.simple_poll = avahi_simple_poll_new();

1817

if(mc.simple_poll == NULL){

2050

1818

fprintf_plus(stderr,

2051

1819

"Avahi: Failed to create simple poll object.\n");

2052

1820

exitcode = EX_UNAVAILABLE;

2116

1884

}

2117

1885

}

2118

1886

2119

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

2120

if(interfaces == NULL){

2121

struct dirent **direntries;

2122

/* Look for any good interfaces */

2123

ret = scandir(sys_class_net, &direntries, good_interface,

2124

alphasort);

2125

if(ret >= 1){

2126

/* Add all found interfaces to interfaces list */

2127

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2129

direntries[i]->d_name);

2130

if(ret_errno != 0){

2131

perror_plus("argz_add");

2132

continue;

2133

}

2134

if(debug){

2135

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2136

direntries[i]->d_name);

2137

}

2138

}

2139

free(direntries);

2140

} else {

2141

free(direntries);

2142

fprintf_plus(stderr, "Could not find a network interface\n");

2143

exitcode = EXIT_FAILURE;

2144

goto end;

2145

}

2146

}

2147

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

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

2159

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

2160

char *interface = NULL;

2161

while((interface = argz_next(interfaces, interfaces_size,

2162

interface))){

2163

bool interface_was_up = interface_is_up(interface);

2164

ret = bring_up_interface(interface, delay);

2165

if(not interface_was_up){

2166

if(ret != 0){

2167

errno = ret;

2168

perror_plus("Failed to bring up interface");

2169

} else {

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2173

}

2174

}

2175

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2179

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

2180

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

1887

/* If the interface is down, bring it up */

1888

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

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1890

if(if_index == 0){

1891

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1892

exitcode = EX_UNAVAILABLE;

1893

goto end;

1894

}

1895

1896

if(quit_now){

1897

goto end;

1898

}

1899

1900

/* Re-raise priviliges */

1901

errno = 0;

1902

ret = seteuid(0);

1903

if(ret == -1){

1904

perror_plus("seteuid");

1905

}

1906

1907

#ifdef __linux__

1908

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1909

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

1910

ret = klogctl(8, NULL, 5);

1911

bool restore_loglevel = true;

1912

if(ret == -1){

1913

restore_loglevel = false;

1914

perror_plus("klogctl");

1915

}

1916

#endif /* __linux__ */

1917

1918

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1919

if(sd < 0){

1920

perror_plus("socket");

1921

exitcode = EX_OSERR;

1922

#ifdef __linux__

1923

if(restore_loglevel){

1924

ret = klogctl(7, NULL, 0);

1925

if(ret == -1){

1926

perror_plus("klogctl");

1927

}

1928

}

1929

#endif /* __linux__ */

1930

/* Lower privileges */

1931

errno = 0;

1932

ret = seteuid(uid);

1933

if(ret == -1){

1934

perror_plus("seteuid");

1935

}

1936

goto end;

1937

}

1938

strcpy(network.ifr_name, interface);

1939

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1940

if(ret == -1){

1941

perror_plus("ioctl SIOCGIFFLAGS");

1942

#ifdef __linux__

1943

if(restore_loglevel){

1944

ret = klogctl(7, NULL, 0);

1945

if(ret == -1){

1946

perror_plus("klogctl");

1947

}

1948

}

1949

#endif /* __linux__ */

1950

exitcode = EX_OSERR;

1951

/* Lower privileges */

1952

errno = 0;

1953

ret = seteuid(uid);

1954

if(ret == -1){

1955

perror_plus("seteuid");

1956

}

1957

goto end;

1958

}

1959

if((network.ifr_flags & IFF_UP) == 0){

1960

network.ifr_flags |= IFF_UP;

1961

take_down_interface = true;

1962

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

1963

if(ret == -1){

1964

take_down_interface = false;

1965

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1966

exitcode = EX_OSERR;

1967

#ifdef __linux__

1968

if(restore_loglevel){

1969

ret = klogctl(7, NULL, 0);

1970

if(ret == -1){

1971

perror_plus("klogctl");

1972

}

1973

}

1974

#endif /* __linux__ */

1975

/* Lower privileges */

1976

errno = 0;

1977

ret = seteuid(uid);

1978

if(ret == -1){

1979

perror_plus("seteuid");

1980

}

1981

goto end;

1982

}

1983

}

1984

/* Sleep checking until interface is running.

1985

Check every 0.25s, up to total time of delay */

1986

for(int i=0; i < delay * 4; i++){

1987

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1988

if(ret == -1){

1989

perror_plus("ioctl SIOCGIFFLAGS");

1990

} else if(network.ifr_flags & IFF_RUNNING){

1991

break;

1992

}

1993

struct timespec sleeptime = { .tv_nsec = 250000000 };

1994

ret = nanosleep(&sleeptime, NULL);

1995

if(ret == -1 and errno != EINTR){

1996

perror_plus("nanosleep");

1997

}

1998

}

1999

if(not take_down_interface){

2000

/* We won't need the socket anymore */

2001

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

2002

if(ret == -1){

2003

perror_plus("close");

2004

}

2005

}

2006

#ifdef __linux__

2007

if(restore_loglevel){

2008

/* Restores kernel loglevel to default */

2009

ret = klogctl(7, NULL, 0);

2010

if(ret == -1){

2011

perror_plus("klogctl");

2012

}

2013

}

2014

#endif /* __linux__ */

2015

/* Lower privileges */

2016

errno = 0;

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

2181

2021

}

2182

2022

}

2183

2023

2224

2064

/* Connect directly, do not use Zeroconf */

2225

2065

/* (Mainly meant for debugging) */

2226

2066

char *address = strrchr(connect_to, ':');

2227

2228

2067

if(address == NULL){

2229

2068

fprintf_plus(stderr, "No colon in address\n");

2230

2069

exitcode = EX_USAGE;

2235

2074

goto end;

2236

2075

}

2237

2076

2238

in_port_t port;

2077

uint16_t port;

2239

2078

errno = 0;

2240

2079

tmpmax = strtoimax(address+1, &tmp, 10);

2241

2080

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2242

or tmpmax != (in_port_t)tmpmax){

2081

or tmpmax != (uint16_t)tmpmax){

2243

2082

fprintf_plus(stderr, "Bad port number\n");

2244

2083

exitcode = EX_USAGE;

2245

2084

goto end;

2249

2088

goto end;

2250

2089

}

2251

2090

2252

port = (in_port_t)tmpmax;

2091

port = (uint16_t)tmpmax;

2253

2092

*address = '\0';

2254

2093

/* Colon in address indicates IPv6 */

2255

2094

int af;

2303

2142

config.publish_domain = 0;

2304

2143

2305

2144

/* Allocate a new server */

2306

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2307

&config, NULL, NULL, &ret_errno);

2145

mc.server = avahi_server_new(avahi_simple_poll_get

2146

(mc.simple_poll), &config, NULL,

2147

NULL, &error);

2308

2148

2309

2149

/* Free the Avahi configuration data */

2310

2150

avahi_server_config_free(&config);

2313

2153

/* Check if creating the Avahi server object succeeded */

2314

2154

if(mc.server == NULL){

2315

2155

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

2316

avahi_strerror(ret_errno));

2156

avahi_strerror(error));

2317

2157

exitcode = EX_UNAVAILABLE;

2318

2158

goto end;

2319

2159

}

2343

2183

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

2344

2184

}

2345

2185

2346

ret = avahi_loop_with_timeout(simple_poll,

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

2347

2187

(int)(retry_interval * 1000));

2348

2188

if(debug){

2349

2189

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2363

2203

if(mc.server != NULL)

2364

2204

avahi_server_free(mc.server);

2365

2205

2366

if(simple_poll != NULL)

2367

avahi_simple_poll_free(simple_poll);

2206

if(mc.simple_poll != NULL)

2207

avahi_simple_poll_free(mc.simple_poll);

2368

2208

2369

2209

if(gnutls_initialized){

2370

2210

gnutls_certificate_free_credentials(mc.cred);

2387

2227

}

2388

2228

}

2389

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2390

2233

/* Re-raise priviliges */

2391

2234

{

2392

raise_privileges();

2393

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

2235

errno = 0;

2236

ret = seteuid(0);

2237

if(ret == -1){

2238

perror_plus("seteuid");

2239

}

2240

2241

/* Take down the network interface */

2242

if(take_down_interface and geteuid() == 0){

2243

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2244

if(ret == -1){

2245

perror_plus("ioctl SIOCGIFFLAGS");

2246

} else if(network.ifr_flags & IFF_UP){

2247

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

2248

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

2249

if(ret == -1){

2250

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2408

2251

}

2409

2252

}

2410

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

2411

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

2412

" down\n");

2253

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

2254

if(ret == -1){

2255

perror_plus("close");

2413

2256

}

2414

2257

}

2415

2416

lower_privileges_permanently();

2417

}

2418

2419

free(interfaces_to_take_down);

2420

free(interfaces_hooks);

2258

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2421

2265

2422

2266

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

2423

2267

if(tempdir_created){