/mandos/trunk : revision 589.1.1

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;

161

157

const char *priority;

162

158

gpgme_ctx_t ctx;

163

159

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

166

160

} mandos_context;

167

161

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

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 };

170

167

171

168

sig_atomic_t quit_now = 0;

172

169

int signal_received = 0;

208

205

}

209

206

210

207

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

211

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

212

int af, server **current_server){

208

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

209

int af){

213

210

int ret;

214

211

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

215

212

if(new_server == NULL){

225

222

return false;

226

223

}

227

224

/* Special case of first server */

228

if(*current_server == NULL){

225

if (mc.current_server == NULL){

229

226

new_server->next = new_server;

230

227

new_server->prev = new_server;

231

*current_server = new_server;

228

mc.current_server = new_server;

232

229

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

233

230

} else {

234

new_server->next = *current_server;

235

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

231

new_server->next = mc.current_server;

232

new_server->prev = mc.current_server->prev;

236

233

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

238

235

}

239

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

236

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

240

237

if(ret == -1){

241

238

perror_plus("clock_gettime");

242

239

return false;

248

245

* Initialize GPGME.

249

246

*/

250

247

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

251

const char *tempdir, mandos_context *mc){

248

const char *tempdir){

252

249

gpgme_error_t rc;

253

250

gpgme_engine_info_t engine_info;

254

251

252

255

253

/*

256

254

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

257

255

*/

273

271

return false;

274

272

}

275

273

276

rc = gpgme_op_import(mc->ctx, pgp_data);

274

rc = gpgme_op_import(mc.ctx, pgp_data);

277

275

if(rc != GPG_ERR_NO_ERROR){

278

276

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

279

277

gpgme_strsource(rc), gpgme_strerror(rc));

323

321

}

324

322

325

323

/* Create new GPGME "context" */

326

rc = gpgme_new(&(mc->ctx));

324

rc = gpgme_new(&(mc.ctx));

327

325

if(rc != GPG_ERR_NO_ERROR){

328

326

fprintf_plus(stderr, "Mandos plugin mandos-client: "

329

327

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

344

342

*/

345

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

344

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

345

char **plaintext){

349

346

gpgme_data_t dh_crypto, dh_plain;

350

347

gpgme_error_t rc;

351

348

ssize_t ret;

377

374

378

375

/* Decrypt data from the cryptotext data buffer to the plaintext

379

376

data buffer */

380

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

377

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

381

378

if(rc != GPG_ERR_NO_ERROR){

382

379

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

383

380

gpgme_strsource(rc), gpgme_strerror(rc));

384

381

plaintext_length = -1;

385

382

if(debug){

386

383

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

388

385

if(result == NULL){

389

386

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

390

387

} else {

468

465

}

469

466

470

467

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

468

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

469

-Wunreachable-code */

472

470

if(ret == NULL)

473

471

ret = "(unknown)";

474

472

return ret;

481

479

}

482

480

483

481

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

482

const char *seckeyfilename){

486

483

int ret;

487

484

488

485

if(debug){

505

502

}

506

503

507

504

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

506

if(ret != GNUTLS_E_SUCCESS){

510

507

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

511

508

safer_gnutls_strerror(ret));

521

518

}

522

519

523

520

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

525

522

GNUTLS_OPENPGP_FMT_BASE64);

526

523

if(ret != GNUTLS_E_SUCCESS){

527

524

fprintf_plus(stderr,

533

530

}

534

531

535

532

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

537

534

if(ret != GNUTLS_E_SUCCESS){

538

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

536

" initialization: %s\n",

540

537

safer_gnutls_strerror(ret));

541

538

goto globalfail;

542

539

}

543

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

540

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

544

541

if(ret != GNUTLS_E_SUCCESS){

545

542

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

546

543

safer_gnutls_strerror(ret));

547

544

goto globalfail;

548

545

}

549

546

550

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

548

552

549

return 0;

553

550

554

551

globalfail:

555

552

556

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

557

554

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

559

556

return -1;

560

557

}

561

558

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

564

560

int ret;

565

561

/* GnuTLS session creation */

566

562

do {

578

574

{

579

575

const char *err;

580

576

do {

581

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

577

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

582

578

if(quit_now){

583

579

gnutls_deinit(*session);

584

580

return -1;

595

591

596

592

do {

597

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

594

mc.cred);

599

595

if(quit_now){

600

596

gnutls_deinit(*session);

601

597

return -1;

611

607

/* ignore client certificate if any. */

612

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

609

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

611

616

612

return 0;

617

613

}

621

617

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

622

618

623

619

/* Called when a Mandos server is found */

624

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

620

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

625

621

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

622

int af){

627

623

int ret, tcp_sd = -1;

628

624

ssize_t sret;

629

625

union {

659

655

return -1;

660

656

}

661

657

662

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

663

659

if(ret != 0){

664

660

return -1;

665

661

}

666

662

667

663

if(debug){

668

664

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

669

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

665

PRIu16 "\n", ip, port);

670

666

}

671

667

672

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

703

699

goto mandos_end;

704

700

}

705

701

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

707

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

707

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

709

708

-Wunreachable-code*/

733

732

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

734

733

perror_plus("if_indextoname");

735

734

} else {

736

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

737

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

735

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

736

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

738

737

}

739

738

} else {

740

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

741

ip, (uintmax_t)port);

739

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

740

ip, port);

742

741

}

743

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

937

936

if(buffer_length > 0){

938

937

ssize_t decrypted_buffer_size;

939

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer, mc);

939

&decrypted_buffer);

941

940

if(decrypted_buffer_size >= 0){

942

941

943

942

written = 0;

1004

1003

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1004

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1005

flags,

1007

void* mc){

1008

if(r == NULL){

1009

return;

1010

}

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1011

1008

1012

1009

/* Called whenever a service has been resolved successfully or

1013

1010

timed out */

1022

1019

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1023

1020

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1024

1021

domain,

1025

avahi_strerror(avahi_server_errno

1026

(((mandos_context*)mc)->server)));

1022

avahi_strerror(avahi_server_errno(mc.server)));

1027

1023

break;

1028

1024

1029

1025

case AVAHI_RESOLVER_FOUND:

1035

1031

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

1036

1032

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

1037

1033

}

1038

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

1039

interface,

1040

avahi_proto_to_af(proto),

1041

mc);

1034

int ret = start_mandos_communication(ip, port, interface,

1035

avahi_proto_to_af(proto));

1042

1036

if(ret == 0){

1043

avahi_simple_poll_quit(simple_poll);

1037

avahi_simple_poll_quit(mc.simple_poll);

1044

1038

} else {

1045

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

1046

avahi_proto_to_af(proto),

1047

&((mandos_context*)mc)->current_server)){

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1048

1041

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

1049

1042

" list\n", name);

1050

1043

}

1063

1056

const char *domain,

1064

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1058

flags,

1066

void* mc){

1067

if(b == NULL){

1068

return;

1069

}

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1070

1061

1071

1062

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

1072

1063

is removed from the LAN */

1080

1071

case AVAHI_BROWSER_FAILURE:

1081

1072

1082

1073

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

1083

avahi_strerror(avahi_server_errno

1084

(((mandos_context*)mc)->server)));

1085

avahi_simple_poll_quit(simple_poll);

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

avahi_simple_poll_quit(mc.simple_poll);

1086

1076

return;

1087

1077

1088

1078

case AVAHI_BROWSER_NEW:

1091

1081

the callback function is called the Avahi server will free the

1092

1082

resolver for us. */

1093

1083

1094

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1095

interface, protocol, name, type,

1096

domain, protocol, 0,

1097

resolve_callback, mc) == NULL)

1084

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1085

name, type, domain, protocol, 0,

1086

resolve_callback, NULL) == NULL)

1098

1087

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1099

1088

" %s\n", name,

1100

avahi_strerror(avahi_server_errno

1101

(((mandos_context*)mc)->server)));

1089

avahi_strerror(avahi_server_errno(mc.server)));

1102

1090

break;

1103

1091

1104

1092

case AVAHI_BROWSER_REMOVE:

1123

1111

signal_received = sig;

1124

1112

int old_errno = errno;

1125

1113

/* set main loop to exit */

1126

if(simple_poll != NULL){

1127

avahi_simple_poll_quit(simple_poll);

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1128

1116

}

1129

1117

errno = old_errno;

1130

1118

}

1131

1119

1132

1120

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

1133

1121

int ret;

1134

error_t ret_errno;

1135

1122

1136

1123

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

1137

1124

if(s < 0){

1138

ret_errno = errno;

1139

1125

perror_plus("socket");

1140

errno = ret_errno;

1141

1126

return false;

1142

1127

}

1143

1128

strcpy(ifr->ifr_name, ifname);

1144

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

1130

if(ret == -1){

1146

1131

if(debug){

1147

ret_errno = errno;

1148

1132

perror_plus("ioctl SIOCGIFFLAGS");

1149

errno = ret_errno;

1150

1133

}

1151

1134

return false;

1152

1135

}

1221

1204

}

1222

1205

1223

1206

/*

1224

* This function determines if a network interface is up.

1225

*/

1226

bool interface_is_up(const char *interface){

1227

struct ifreq ifr;

1228

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

1229

if(debug){

1230

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

1231

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

1232

}

1233

return false;

1234

}

1235

1236

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

1237

}

1238

1239

/*

1240

* This function determines if a network interface is running

1241

*/

1242

bool interface_is_running(const char *interface){

1243

struct ifreq ifr;

1244

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

1245

if(debug){

1246

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

1247

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

1248

}

1249

return false;

1250

}

1251

1252

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

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1253

1247

}

1254

1248

1255

1249

int notdotentries(const struct dirent *direntry){

1324

1318

return 1;

1325

1319

}

1326

1320

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1329

1322

int ret;

1330

1323

struct timespec now;

1331

1324

struct timespec waited_time;

1332

1325

intmax_t block_time;

1333

1326

1334

1327

while(true){

1335

if(mc->current_server == NULL){

1328

if(mc.current_server == NULL){

1336

1329

if (debug){

1337

1330

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

1338

1331

" No timeout!\n");

1352

1345

/* Calculating in ms how long time between now and server

1353

1346

who we visted longest time ago. Now - last seen. */

1354

1347

waited_time.tv_sec = (now.tv_sec

1355

- mc->current_server->last_seen.tv_sec);

1348

- mc.current_server->last_seen.tv_sec);

1356

1349

waited_time.tv_nsec = (now.tv_nsec

1357

- mc->current_server->last_seen.tv_nsec);

1350

- mc.current_server->last_seen.tv_nsec);

1358

1351

/* total time is 10s/10,000ms.

1359

1352

Converting to s from ms by dividing by 1,000,

1360

1353

and ns to ms by dividing by 1,000,000. */

1368

1361

}

1369

1362

1370

1363

if(block_time <= 0){

1371

ret = start_mandos_communication(mc->current_server->ip,

1372

mc->current_server->port,

1373

mc->current_server->if_index,

1374

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1375

1368

if(ret == 0){

1376

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1377

1370

return 0;

1378

1371

}

1379

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1380

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1381

1374

if(ret == -1){

1382

1375

perror_plus("clock_gettime");

1383

1376

return -1;

1384

1377

}

1385

mc->current_server = mc->current_server->next;

1378

mc.current_server = mc.current_server->next;

1386

1379

block_time = 0; /* Call avahi to find new Mandos

1387

1380

servers, but don't block */

1388

1381

}

1397

1390

}

1398

1391

}

1399

1392

1400

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

1401

error_t raise_privileges(void){

1402

error_t old_errno = errno;

1403

error_t ret_errno = 0;

1404

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

1405

ret_errno = errno;

1406

perror_plus("seteuid");

1407

}

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

1412

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

1413

error_t raise_privileges_permanently(void){

1414

error_t old_errno = errno;

1415

error_t ret_errno = raise_privileges();

1416

if(ret_errno != 0){

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

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

1421

ret_errno = errno;

1422

perror_plus("seteuid");

1423

}

1424

errno = old_errno;

1425

return ret_errno;

1426

}

1427

1428

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

1429

error_t lower_privileges(void){

1430

error_t old_errno = errno;

1431

error_t ret_errno = 0;

1432

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

1433

ret_errno = errno;

1434

perror_plus("seteuid");

1435

}

1436

errno = old_errno;

1437

return ret_errno;

1438

}

1439

1440

/* Lower privileges permanently */

1441

error_t lower_privileges_permanently(void){

1442

error_t old_errno = errno;

1443

error_t ret_errno = 0;

1444

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

1445

ret_errno = errno;

1446

perror_plus("setuid");

1447

}

1448

errno = old_errno;

1449

return ret_errno;

1450

}

1451

1452

1393

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

1453

1394

const float delay){

1454

1395

struct dirent **direntries;

1457

1398

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

1458

1399

alphasort);

1459

1400

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

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

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1467

}

1401

perror_plus("scandir");

1468

1402

} else {

1469

1403

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

1470

1404

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

1483

1417

if(hook_pid == 0){

1484

1418

/* Child */

1485

1419

/* Raise privileges */

1486

raise_privileges_permanently();

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1487

1431

/* Set group */

1488

1432

errno = 0;

1489

1433

ret = setgid(0);

1582

1526

return true;

1583

1527

}

1584

1528

1585

error_t bring_up_interface(const char *const interface,

1586

const float delay){

1587

int sd = -1;

1588

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1591

struct ifreq network;

1592

unsigned int if_index = if_nametoindex(interface);

1593

if(if_index == 0){

1594

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

1595

errno = old_errno;

1596

return ENXIO;

1597

}

1598

1599

if(quit_now){

1600

errno = old_errno;

1601

return EINTR;

1602

}

1603

1604

if(not interface_is_up(interface)){

1605

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

1606

ret_errno = errno;

1607

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

1608

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

1609

return ret_errno;

1610

}

1611

network.ifr_flags |= IFF_UP;

1612

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1615

ret_errno = errno;

1616

perror_plus("socket");

1617

errno = old_errno;

1618

return ret_errno;

1619

}

1620

1621

if(quit_now){

1622

close(sd);

1623

errno = old_errno;

1624

return EINTR;

1625

}

1626

1627

if(debug){

1628

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

1629

interface);

1630

}

1631

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1635

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1643

}

1644

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1647

#ifdef __linux__

1648

if(restore_loglevel){

1649

ret_linux = klogctl(7, NULL, 0);

1650

if(ret_linux == -1){

1651

perror_plus("klogctl");

1652

}

1653

}

1654

#endif /* __linux__ */

1655

1656

/* Lower privileges */

1657

lower_privileges();

1658

1659

/* Close the socket */

1660

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

1661

if(ret == -1){

1662

perror_plus("close");

1663

}

1664

1665

if(ret_setflags == -1){

1666

errno = ret_errno;

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

errno = old_errno;

1669

return ret_errno;

1670

}

1671

} else if(debug){

1672

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

1673

interface);

1674

}

1675

1676

/* Sleep checking until interface is running.

1677

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

1678

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

1679

if(interface_is_running(interface)){

1680

break;

1681

}

1682

struct timespec sleeptime = { .tv_nsec = 250000000 };

1683

ret = nanosleep(&sleeptime, NULL);

1684

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

1685

perror_plus("nanosleep");

1686

}

1687

}

1688

1689

errno = old_errno;

1690

return 0;

1691

}

1692

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

struct ifreq network;

1699

unsigned int if_index = if_nametoindex(interface);

1700

if(if_index == 0){

1701

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

1702

errno = old_errno;

1703

return ENXIO;

1704

}

1705

if(interface_is_up(interface)){

1706

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

1707

ret_errno = errno;

1708

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

1709

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

1710

return ret_errno;

1711

}

1712

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

1713

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1716

ret_errno = errno;

1717

perror_plus("socket");

1718

errno = old_errno;

1719

return ret_errno;

1720

}

1721

1722

if(debug){

1723

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

1724

interface);

1725

}

1726

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1735

1736

/* Close the socket */

1737

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

1738

if(ret == -1){

1739

perror_plus("close");

1740

}

1741

1742

if(ret_setflags == -1){

1743

errno = ret_errno;

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

errno = old_errno;

1746

return ret_errno;

1747

}

1748

} else if(debug){

1749

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

1750

interface);

1751

}

1752

1753

errno = old_errno;

1754

return 0;

1755

}

1756

1757

1529

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

1758

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

1759

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

1760

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

1761

.interfaces = NULL, .interfaces_size = 0 };

1762

1530

AvahiSServiceBrowser *sb = NULL;

1763

error_t ret_errno;

1531

int error;

1764

1532

int ret;

1765

1533

intmax_t tmpmax;

1766

1534

char *tmp;

1767

1535

int exitcode = EXIT_SUCCESS;

1768

char *interfaces_to_take_down = NULL;

1769

size_t interfaces_to_take_down_size = 0;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1770

1542

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

1771

1543

bool tempdir_created = false;

1772

1544

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1545

const char *seckey = PATHDIR "/" SECKEY;

1774

1546

const char *pubkey = PATHDIR "/" PUBKEY;

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1547

1778

1548

bool gnutls_initialized = false;

1779

1549

bool gpgme_initialized = false;

1870

1640

connect_to = arg;

1871

1641

break;

1872

1642

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

1873

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

1874

arg, (int)',');

1875

if(ret_errno != 0){

1876

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

1877

}

1643

interface = arg;

1878

1644

break;

1879

1645

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

1880

1646

seckey = arg;

1958

1724

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

1959

1725

1960

1726

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1962

1732

struct stat st;

1963

1733

1964

1734

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

2012

1782

}

2013

1783

}

2014

1784

2015

/* Remove empty interface names */

2016

{

2017

char *interface = NULL;

2018

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

2019

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

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

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2023

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

2024

}

2025

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

2026

interface = NULL;

2027

}

2028

}

2029

}

2030

2031

1785

/* Run network hooks */

2032

{

2033

2034

if(mc.interfaces != NULL){

2035

interfaces_hooks = malloc(mc.interfaces_size);

2036

if(interfaces_hooks == NULL){

2037

perror_plus("malloc");

2038

goto end;

2039

}

2040

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

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

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

2046

interfaces_hooks : "", delay)){

2047

goto end;

2048

}

1786

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

1787

goto end;

2049

1788

}

2050

1789

2051

1790

if(not debug){

2052

1791

avahi_set_log_function(empty_log);

2053

1792

}

2054

1793

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

2055

1826

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

2056

1827

from the signal handler */

2057

1828

/* Initialize the pseudo-RNG for Avahi */

2058

1829

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

2059

simple_poll = avahi_simple_poll_new();

2060

if(simple_poll == NULL){

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2061

1832

fprintf_plus(stderr,

2062

1833

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

2063

1834

exitcode = EX_UNAVAILABLE;

2127

1898

}

2128

1899

}

2129

1900

2130

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

2131

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2133

/* Look for any good interfaces */

2134

ret = scandir(sys_class_net, &direntries, good_interface,

2135

alphasort);

2136

if(ret >= 1){

2137

/* Add all found interfaces to interfaces list */

2138

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

2139

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

2140

direntries[i]->d_name);

2141

if(ret_errno != 0){

2142

perror_plus("argz_add");

2143

continue;

2144

}

2145

if(debug){

2146

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

2147

direntries[i]->d_name);

2148

}

2149

}

2150

free(direntries);

2151

} else {

2152

free(direntries);

2153

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

2154

exitcode = EXIT_FAILURE;

2155

goto end;

2156

}

2157

}

2158

2159

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

2160

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

2161

if(debug){

2162

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

2163

mc.interfaces);

2164

}

2165

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

2166

}

2167

2168

/* Bring up interfaces which are down */

2169

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

2170

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

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

2185

}

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

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

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

1986

}

1987

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2005

break;

2006

}

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2192

2035

}

2193

2036

}

2194

2037

2196

2039

goto end;

2197

2040

}

2198

2041

2199

ret = init_gnutls_global(pubkey, seckey, &mc);

2042

ret = init_gnutls_global(pubkey, seckey);

2200

2043

if(ret == -1){

2201

2044

fprintf_plus(stderr, "init_gnutls_global failed\n");

2202

2045

exitcode = EX_UNAVAILABLE;

2219

2062

goto end;

2220

2063

}

2221

2064

2222

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

2065

if(not init_gpgme(pubkey, seckey, tempdir)){

2223

2066

fprintf_plus(stderr, "init_gpgme failed\n");

2224

2067

exitcode = EX_UNAVAILABLE;

2225

2068

goto end;

2235

2078

/* Connect directly, do not use Zeroconf */

2236

2079

/* (Mainly meant for debugging) */

2237

2080

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

2238

2239

2081

if(address == NULL){

2240

2082

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

2241

2083

exitcode = EX_USAGE;

2246

2088

goto end;

2247

2089

}

2248

2090

2249

in_port_t port;

2091

uint16_t port;

2250

2092

errno = 0;

2251

2093

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

2252

2094

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

2253

or tmpmax != (in_port_t)tmpmax){

2095

or tmpmax != (uint16_t)tmpmax){

2254

2096

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

2255

2097

exitcode = EX_USAGE;

2256

2098

goto end;

2260

2102

goto end;

2261

2103

}

2262

2104

2263

port = (in_port_t)tmpmax;

2105

port = (uint16_t)tmpmax;

2264

2106

*address = '\0';

2265

2107

/* Colon in address indicates IPv6 */

2266

2108

int af;

2282

2124

}

2283

2125

2284

2126

while(not quit_now){

2285

ret = start_mandos_communication(address, port, if_index, af,

2286

&mc);

2127

ret = start_mandos_communication(address, port, if_index, af);

2287

2128

if(quit_now or ret == 0){

2288

2129

break;

2289

2130

}

2315

2156

config.publish_domain = 0;

2316

2157

2317

2158

/* Allocate a new server */

2318

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2319

&config, NULL, NULL, &ret_errno);

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2320

2162

2321

2163

/* Free the Avahi configuration data */

2322

2164

avahi_server_config_free(&config);

2325

2167

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

2326

2168

if(mc.server == NULL){

2327

2169

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

2328

avahi_strerror(ret_errno));

2170

avahi_strerror(error));

2329

2171

exitcode = EX_UNAVAILABLE;

2330

2172

goto end;

2331

2173

}

2337

2179

/* Create the Avahi service browser */

2338

2180

sb = avahi_s_service_browser_new(mc.server, if_index,

2339

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2340

NULL, 0, browse_callback,

2341

(void *)&mc);

2182

NULL, 0, browse_callback, NULL);

2342

2183

if(sb == NULL){

2343

2184

fprintf_plus(stderr, "Failed to create service browser: %s\n",

2344

2185

avahi_strerror(avahi_server_errno(mc.server)));

2356

2197

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

2357

2198

}

2358

2199

2359

ret = avahi_loop_with_timeout(simple_poll,

2360

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

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2361

2202

if(debug){

2362

2203

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

2363

2204

(ret == 0) ? "successfully" : "with error");

2376

2217

if(mc.server != NULL)

2377

2218

avahi_server_free(mc.server);

2378

2219

2379

if(simple_poll != NULL)

2380

avahi_simple_poll_free(simple_poll);

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2381

2222

2382

2223

if(gnutls_initialized){

2383

2224

gnutls_certificate_free_credentials(mc.cred);

2400

2241

}

2401

2242

}

2402

2243

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2403

2247

/* Re-raise priviliges */

2404

2248

{

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

2253

}

2254

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2421

2265

}

2422

2266

}

2423

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

2424

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

2425

" down\n");

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2426

2270

}

2427

2271

}

2428

2429

lower_privileges_permanently();

2430

}

2431

2432

free(interfaces_to_take_down);

2433

free(interfaces_hooks);

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2434

2279

2435

2280

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

2436

2281

if(tempdir_created){