/mandos/release : revision 237.21.1

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

/* If the interface is specified and we have a list of interfaces */

663

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

664

/* Check if the interface is one of the interfaces we are using */

665

bool match = false;

666

{

667

char *interface = NULL;

668

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

669

interface))){

670

if(if_nametoindex(interface) == (unsigned int)if_index){

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

/* This interface does not match any in the list, so we don't

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

fprintf_plus(stderr, "Skipping server on non-used interface"

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

695

659

if(ret != 0){

696

660

return -1;

697

661

}

698

662

699

663

if(debug){

700

664

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

701

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

665

PRIu16 "\n", ip, port);

702

666

}

703

667

704

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

699

goto mandos_end;

736

700

}

737

701

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

739

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

707

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

741

708

-Wunreachable-code*/

765

732

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

766

733

perror_plus("if_indextoname");

767

734

} else {

768

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

769

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

735

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

736

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

770

737

}

771

738

} else {

772

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

773

ip, (uintmax_t)port);

739

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

740

ip, port);

774

741

}

775

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

969

936

if(buffer_length > 0){

970

937

ssize_t decrypted_buffer_size;

971

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

939

&decrypted_buffer);

973

940

if(decrypted_buffer_size >= 0){

974

941

975

942

written = 0;

1036

1003

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1004

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1005

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1043

1008

1044

1009

/* Called whenever a service has been resolved successfully or

1045

1010

timed out */

1054

1019

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

1055

1020

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

1056

1021

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

1022

avahi_strerror(avahi_server_errno(mc.server)));

1059

1023

break;

1060

1024

1061

1025

case AVAHI_RESOLVER_FOUND:

1067

1031

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

1068

1032

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

1069

1033

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1034

int ret = start_mandos_communication(ip, port, interface,

1035

avahi_proto_to_af(proto));

1074

1036

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1037

avahi_simple_poll_quit(mc.simple_poll);

1076

1038

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1080

1041

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

1081

1042

" list\n", name);

1082

1043

}

1095

1056

const char *domain,

1096

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1058

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1102

1061

1103

1062

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

1104

1063

is removed from the LAN */

1112

1071

case AVAHI_BROWSER_FAILURE:

1113

1072

1114

1073

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

avahi_simple_poll_quit(mc.simple_poll);

1118

1076

return;

1119

1077

1120

1078

case AVAHI_BROWSER_NEW:

1123

1081

the callback function is called the Avahi server will free the

1124

1082

resolver for us. */

1125

1083

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

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)

1130

1087

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

1131

1088

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1089

avahi_strerror(avahi_server_errno(mc.server)));

1134

1090

break;

1135

1091

1136

1092

case AVAHI_BROWSER_REMOVE:

1155

1111

signal_received = sig;

1156

1112

int old_errno = errno;

1157

1113

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1160

1116

}

1161

1117

errno = old_errno;

1162

1118

}

1163

1119

1164

1120

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

1165

1121

int ret;

1166

error_t ret_errno;

1167

1122

1168

1123

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

1169

1124

if(s < 0){

1170

ret_errno = errno;

1171

1125

perror_plus("socket");

1172

errno = ret_errno;

1173

1126

return false;

1174

1127

}

1175

1128

strcpy(ifr->ifr_name, ifname);

1176

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1130

if(ret == -1){

1178

1131

if(debug){

1179

ret_errno = errno;

1180

1132

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1133

}

1183

1134

return false;

1184

1135

}

1253

1204

}

1254

1205

1255

1206

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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;

1285

1247

}

1286

1248

1287

1249

int notdotentries(const struct dirent *direntry){

1356

1318

return 1;

1357

1319

}

1358

1320

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1322

int ret;

1362

1323

struct timespec now;

1363

1324

struct timespec waited_time;

1364

1325

intmax_t block_time;

1365

1326

1366

1327

while(true){

1367

if(mc->current_server == NULL){

1328

if(mc.current_server == NULL){

1368

1329

if (debug){

1369

1330

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

1370

1331

" No timeout!\n");

1384

1345

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

1385

1346

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

1386

1347

waited_time.tv_sec = (now.tv_sec

1387

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

1348

- mc.current_server->last_seen.tv_sec);

1388

1349

waited_time.tv_nsec = (now.tv_nsec

1389

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

1350

- mc.current_server->last_seen.tv_nsec);

1390

1351

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

1391

1352

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

1392

1353

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

1400

1361

}

1401

1362

1402

1363

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

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);

1407

1368

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1409

1370

return 0;

1410

1371

}

1411

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1413

1374

if(ret == -1){

1414

1375

perror_plus("clock_gettime");

1415

1376

return -1;

1416

1377

}

1417

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

1378

mc.current_server = mc.current_server->next;

1418

1379

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

1419

1380

servers, but don't block */

1420

1381

}

1429

1390

}

1430

1391

}

1431

1392

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

1393

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

1485

1394

const float delay){

1486

1395

struct dirent **direntries;

1489

1398

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

1490

1399

alphasort);

1491

1400

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1401

perror_plus("scandir");

1500

1402

} else {

1501

1403

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

1502

1404

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

1515

1417

if(hook_pid == 0){

1516

1418

/* Child */

1517

1419

/* Raise privileges */

1518

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

}

1519

1431

/* Set group */

1520

1432

errno = 0;

1521

1433

ret = setgid(0);

1614

1526

return true;

1615

1527

}

1616

1528

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1789

1529

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1794

1530

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1531

int error;

1796

1532

int ret;

1797

1533

intmax_t tmpmax;

1798

1534

char *tmp;

1799

1535

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

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;

1802

1542

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

1803

1543

bool tempdir_created = false;

1804

1544

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1545

const char *seckey = PATHDIR "/" SECKEY;

1806

1546

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1547

1810

1548

bool gnutls_initialized = false;

1811

1549

bool gpgme_initialized = false;

1902

1640

connect_to = arg;

1903

1641

break;

1904

1642

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

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1643

interface = arg;

1910

1644

break;

1911

1645

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

1912

1646

seckey = arg;

1990

1724

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

1991

1725

1992

1726

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1994

1732

struct stat st;

1995

1733

1996

1734

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

2036

1774

}

2037

1775

2038

1776

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

2056

1781

}

2057

1782

}

2058

1783

}

2059

1784

2060

1785

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

1786

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

1787

goto end;

2077

1788

}

2078

1789

2079

1790

if(not debug){

2080

1791

avahi_set_log_function(empty_log);

2081

1792

}

2082

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

2083

1826

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

2084

1827

from the signal handler */

2085

1828

/* Initialize the pseudo-RNG for Avahi */

2086

1829

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2089

1832

fprintf_plus(stderr,

2090

1833

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

2091

1834

exitcode = EX_UNAVAILABLE;

2155

1898

}

2156

1899

}

2157

1900

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

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");

2204

1986

}

2205

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){

2206

2005

break;

2207

2006

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

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");

2035

}

2233

2036

}

2234

2037

2235

2038

if(quit_now){

2236

2039

goto end;

2237

2040

}

2238

2041

2239

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

2042

ret = init_gnutls_global(pubkey, seckey);

2240

2043

if(ret == -1){

2241

2044

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

2242

2045

exitcode = EX_UNAVAILABLE;

2259

2062

goto end;

2260

2063

}

2261

2064

2262

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

2065

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

2263

2066

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

2264

2067

exitcode = EX_UNAVAILABLE;

2265

2068

goto end;

2275

2078

/* Connect directly, do not use Zeroconf */

2276

2079

/* (Mainly meant for debugging) */

2277

2080

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

2278

2279

2081

if(address == NULL){

2280

2082

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

2281

2083

exitcode = EX_USAGE;

2286

2088

goto end;

2287

2089

}

2288

2090

2289

in_port_t port;

2091

uint16_t port;

2290

2092

errno = 0;

2291

2093

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

2292

2094

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

2293

or tmpmax != (in_port_t)tmpmax){

2095

or tmpmax != (uint16_t)tmpmax){

2294

2096

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

2295

2097

exitcode = EX_USAGE;

2296

2098

goto end;

2297

2099

}

2298

2100

2299

2101

if(quit_now){

2300

2102

goto end;

2301

2103

}

2302

2104

2303

port = (in_port_t)tmpmax;

2105

port = (uint16_t)tmpmax;

2304

2106

*address = '\0';

2305

2107

/* Colon in address indicates IPv6 */

2306

2108

int af;

2322

2124

}

2323

2125

2324

2126

while(not quit_now){

2325

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

2326

&mc);

2127

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

2327

2128

if(quit_now or ret == 0){

2328

2129

break;

2329

2130

}

2355

2156

config.publish_domain = 0;

2356

2157

2357

2158

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2360

2162

2361

2163

/* Free the Avahi configuration data */

2362

2164

avahi_server_config_free(&config);

2365

2167

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

2366

2168

if(mc.server == NULL){

2367

2169

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

2368

avahi_strerror(ret_errno));

2170

avahi_strerror(error));

2369

2171

exitcode = EX_UNAVAILABLE;

2370

2172

goto end;

2371

2173

}

2377

2179

/* Create the Avahi service browser */

2378

2180

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2182

NULL, 0, browse_callback, NULL);

2382

2183

if(sb == NULL){

2383

2184

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

2384

2185

avahi_strerror(avahi_server_errno(mc.server)));

2396

2197

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

2397

2198

}

2398

2199

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2401

2202

if(debug){

2402

2203

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

2403

2204

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

2410

2211

}

2411

2212

2412

2213

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2214

if(sb != NULL)

2416

2215

avahi_s_service_browser_free(sb);

2417

2216

2418

2217

if(mc.server != NULL)

2419

2218

avahi_server_free(mc.server);

2420

2219

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2423

2222

2424

2223

if(gnutls_initialized){

2425

2224

gnutls_certificate_free_credentials(mc.cred);

2442

2241

}

2443

2242

}

2444

2243

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2445

2247

/* Re-raise priviliges */

2446

2248

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

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");

2463

2265

}

2464

2266

}

2465

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

2466

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

2467

" down\n");

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2468

2270

}

2469

2271

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2476

2279

2477

2280

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

2478

2281

if(tempdir_created){