/mandos/release : revision 237.7.207

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

61

*/

62

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

63

strtoimax() */

64

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

65

64

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

66

65

program_invocation_short_name */

67

66

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

88

87

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

89

88

WEXITSTATUS(), WTERMSIG() */

90

89

#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() */

91

94

92

95

#ifdef __linux__

93

96

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

141

144

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

142

145

typedef struct server{

143

146

const char *ip;

144

uint16_t port;

147

in_port_t port;

145

148

AvahiIfIndex if_index;

146

149

int af;

147

150

struct timespec last_seen;

151

154

152

155

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

153

156

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

157

AvahiServer *server;

156

158

gnutls_certificate_credentials_t cred;

157

159

unsigned int dh_bits;

159

161

const char *priority;

160

162

gpgme_ctx_t ctx;

161

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

162

166

} mandos_context;

163

167

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

169

170

171

sig_atomic_t quit_now = 0;

171

172

int signal_received = 0;

186

187

188

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

188

189

program_invocation_short_name));

189

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

190

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

190

191

}

191

192

193

/*

207

208

}

208

209

210

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

210

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

211

int af){

211

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

212

int af, server **current_server){

212

213

int ret;

213

214

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

214

215

if(new_server == NULL){

224

225

return false;

225

226

}

226

227

/* Special case of first server */

227

if (mc.current_server == NULL){

228

if(*current_server == NULL){

228

229

new_server->next = new_server;

229

230

new_server->prev = new_server;

230

mc.current_server = new_server;

231

*current_server = new_server;

231

232

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

232

233

} else {

233

new_server->next = mc.current_server;

234

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

234

new_server->next = *current_server;

235

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

235

236

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

237

238

}

238

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

239

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

239

240

if(ret == -1){

240

241

perror_plus("clock_gettime");

241

242

return false;

247

248

* Initialize GPGME.

248

249

*/

249

250

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

250

const char *tempdir){

251

const char *tempdir, mandos_context *mc){

251

252

gpgme_error_t rc;

252

253

gpgme_engine_info_t engine_info;

253

254

255

/*

256

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

257

*/

273

return false;

274

}

275

276

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

277

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

323

}

324

325

/* Create new GPGME "context" */

326

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

326

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

327

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

344

*/

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

size_t crypto_size,

347

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

348

349

gpgme_data_t dh_crypto, dh_plain;

349

350

gpgme_error_t rc;

350

351

ssize_t ret;

376

377

378

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

378

379

data buffer */

379

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

380

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

380

381

if(rc != GPG_ERR_NO_ERROR){

381

382

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

382

383

gpgme_strsource(rc), gpgme_strerror(rc));

383

384

plaintext_length = -1;

384

385

if(debug){

385

386

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

387

388

if(result == NULL){

388

389

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

389

390

} else {

467

468

}

468

469

470

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

481

}

482

483

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

485

486

int ret;

486

487

488

if(debug){

504

505

}

505

506

507

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

509

if(ret != GNUTLS_E_SUCCESS){

509

510

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

510

511

safer_gnutls_strerror(ret));

520

521

}

521

522

523

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

524

525

GNUTLS_OPENPGP_FMT_BASE64);

525

526

if(ret != GNUTLS_E_SUCCESS){

526

527

fprintf_plus(stderr,

532

533

}

533

534

535

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

536

537

if(ret != GNUTLS_E_SUCCESS){

537

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

539

" initialization: %s\n",

539

540

safer_gnutls_strerror(ret));

540

541

goto globalfail;

541

542

}

542

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

543

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

543

544

if(ret != GNUTLS_E_SUCCESS){

544

545

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

545

546

safer_gnutls_strerror(ret));

546

547

goto globalfail;

547

548

}

548

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

550

551

552

return 0;

552

553

554

globalfail:

554

555

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

556

557

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

558

559

return -1;

559

560

}

560

561

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

562

564

int ret;

563

565

/* GnuTLS session creation */

564

566

do {

576

578

{

577

579

const char *err;

578

580

do {

579

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

581

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

580

582

if(quit_now){

581

583

gnutls_deinit(*session);

582

584

return -1;

593

595

594

596

do {

595

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

598

mc->cred);

597

599

if(quit_now){

598

600

gnutls_deinit(*session);

599

601

return -1;

609

611

/* ignore client certificate if any. */

610

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

613

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

615

614

616

return 0;

615

617

}

619

621

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

620

622

621

623

/* Called when a Mandos server is found */

622

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

624

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

623

625

AvahiIfIndex if_index,

624

int af){

626

int af, mandos_context *mc){

625

627

int ret, tcp_sd = -1;

626

628

ssize_t sret;

627

629

union {

657

659

return -1;

658

660

}

659

661

660

ret = init_gnutls_session(&session);

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);

661

695

if(ret != 0){

662

696

return -1;

663

697

}

664

698

665

699

if(debug){

666

700

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

667

PRIu16 "\n", ip, port);

701

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

668

702

}

669

703

670

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

701

735

goto mandos_end;

702

736

}

703

737

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

708

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

711

748

if(if_index == AVAHI_IF_UNSPEC){

712

749

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

713

750

" incomplete without a network interface\n");

718

755

to.in6.sin6_scope_id = (uint32_t)if_index;

719

756

}

720

757

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

758

to.in.sin_port = htons(port);

724

759

}

725

760

726

761

if(quit_now){

734

769

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

735

770

perror_plus("if_indextoname");

736

771

} else {

737

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

738

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

772

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

773

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

739

774

}

740

775

} else {

741

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

742

ip, port);

776

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

777

ip, (uintmax_t)port);

743

778

}

744

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

938

973

if(buffer_length > 0){

939

974

ssize_t decrypted_buffer_size;

940

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

976

&decrypted_buffer, mc);

942

977

if(decrypted_buffer_size >= 0){

943

978

944

979

written = 0;

1005

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1042

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1010

1047

1011

1048

/* Called whenever a service has been resolved successfully or

1012

1049

timed out */

1021

1058

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

1022

1059

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

1023

1060

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1061

avahi_strerror(avahi_server_errno

1062

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

1025

1063

break;

1026

1064

1027

1065

case AVAHI_RESOLVER_FOUND:

1033

1071

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

1034

1072

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

1035

1073

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1038

1078

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1040

1080

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1043

1084

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

1044

1085

" list\n", name);

1045

1086

}

1058

1099

const char *domain,

1059

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1101

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1063

1106

1064

1107

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

1065

1108

is removed from the LAN */

1073

1116

case AVAHI_BROWSER_FAILURE:

1074

1117

1075

1118

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1078

1122

return;

1079

1123

1080

1124

case AVAHI_BROWSER_NEW:

1083

1127

the callback function is called the Avahi server will free the

1084

1128

resolver for us. */

1085

1129

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1089

1134

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

1090

1135

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1136

avahi_strerror(avahi_server_errno

1137

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

1092

1138

break;

1093

1139

1094

1140

case AVAHI_BROWSER_REMOVE:

1113

1159

signal_received = sig;

1114

1160

int old_errno = errno;

1115

1161

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1118

1164

}

1119

1165

errno = old_errno;

1120

1166

}

1121

1167

1122

1168

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

1123

1169

int ret;

1170

error_t ret_errno;

1124

1171

1125

1172

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

1126

1173

if(s < 0){

1174

ret_errno = errno;

1127

1175

perror_plus("socket");

1176

errno = ret_errno;

1128

1177

return false;

1129

1178

}

1130

1179

strcpy(ifr->ifr_name, ifname);

1131

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1181

if(ret == -1){

1133

1182

if(debug){

1183

ret_errno = errno;

1134

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1135

1186

}

1136

1187

return false;

1137

1188

}

1206

1257

}

1207

1258

1208

1259

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

1249

1289

}

1250

1290

1251

1291

int notdotentries(const struct dirent *direntry){

1320

1360

return 1;

1321

1361

}

1322

1362

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1324

1365

int ret;

1325

1366

struct timespec now;

1326

1367

struct timespec waited_time;

1327

1368

intmax_t block_time;

1328

1369

1329

1370

while(true){

1330

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1331

1372

if (debug){

1332

1373

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

1333

1374

" No timeout!\n");

1347

1388

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

1348

1389

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

1349

1390

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1391

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

1351

1392

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1393

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

1353

1394

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

1354

1395

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

1355

1396

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

1363

1404

}

1364

1405

1365

1406

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1407

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1370

1411

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1372

1413

return 0;

1373

1414

}

1374

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1376

1417

if(ret == -1){

1377

1418

perror_plus("clock_gettime");

1378

1419

return -1;

1379

1420

}

1380

mc.current_server = mc.current_server->next;

1421

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

1381

1422

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

1382

1423

servers, but don't block */

1383

1424

}

1393

1434

}

1394

1435

1395

1436

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1400

1440

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

1441

ret_errno = errno;

1401

1442

perror_plus("seteuid");

1402

1443

}

1403

ret_errno = errno;

1404

1444

errno = old_errno;

1405

1445

return ret_errno;

1406

1446

}

1407

1447

1408

1448

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1412

1452

if(ret_errno != 0){

1413

1453

errno = old_errno;

1414

1454

return ret_errno;

1415

1455

}

1416

errno = 0;

1417

1456

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

1457

ret_errno = errno;

1418

1458

perror_plus("seteuid");

1419

1459

}

1420

ret_errno = errno;

1421

1460

errno = old_errno;

1422

1461

return ret_errno;

1423

1462

}

1424

1463

1425

1464

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1430

1468

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

1469

ret_errno = errno;

1431

1470

perror_plus("seteuid");

1432

1471

}

1433

ret_errno = errno;

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1434

1484

errno = old_errno;

1435

1485

return ret_errno;

1436

1486

}

1443

1493

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

1444

1494

alphasort);

1445

1495

if(numhooks == -1){

1446

perror_plus("scandir");

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1447

1504

} else {

1448

1505

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

1449

1506

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

1561

1618

return true;

1562

1619

}

1563

1620

1564

int bring_up_interface(const char * const interface, const float delay){

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1565

1623

int sd = -1;

1566

int old_errno = errno;

1567

int ret_errno = 0;

1568

int ret;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1569

1627

struct ifreq network;

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1628

unsigned int if_index = if_nametoindex(interface);

1571

1629

if(if_index == 0){

1572

1630

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

1573

1631

errno = old_errno;

1579

1637

return EINTR;

1580

1638

}

1581

1639

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1632

1647

network.ifr_flags |= IFF_UP;

1633

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

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1634

1697

if(ret == -1){

1635

ret_errno = errno;

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1636

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

1647

1704

errno = old_errno;

1648

1705

return ret_errno;

1649

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1650

1710

}

1711

1651

1712

/* Sleep checking until interface is running.

1652

1713

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

1653

1714

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

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

1715

if(interface_is_running(interface)){

1658

1716

break;

1659

1717

}

1660

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1663

1721

perror_plus("nanosleep");

1664

1722

}

1665

1723

}

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1670

1740

}

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

1741

if(interface_is_up(interface)){

1742

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1675

1774

if(ret == -1){

1676

perror_plus("klogctl");

1677

}

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1678

1787

}

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

1788

1682

1789

errno = old_errno;

1683

1790

return 0;

1684

1791

}

1685

1792

1686

1793

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1687

1798

AvahiSServiceBrowser *sb = NULL;

1688

int error;

1799

error_t ret_errno;

1689

1800

int ret;

1690

1801

intmax_t tmpmax;

1691

1802

char *tmp;

1692

1803

int exitcode = EXIT_SUCCESS;

1693

const char *interface = "";

1694

struct ifreq network;

1695

int sd = -1;

1696

bool take_down_interface = false;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1697

1806

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

1698

1807

bool tempdir_created = false;

1699

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1700

1809

const char *seckey = PATHDIR "/" SECKEY;

1701

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1702

1813

1703

1814

bool gnutls_initialized = false;

1704

1815

bool gpgme_initialized = false;

1795

1906

connect_to = arg;

1796

1907

break;

1797

1908

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

1798

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1799

1914

break;

1800

1915

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

1801

1916

seckey = arg;

1925

2040

}

1926

2041

1927

2042

/* Lower privileges */

1928

errno = 0;

1929

ret = seteuid(uid);

1930

if(ret == -1){

1931

perror_plus("seteuid");

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

1932

2060

}

1933

2061

}

1934

2062

}

1935

2063

1936

2064

/* Run network hooks */

1937

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

1938

goto end;

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

1939

2081

}

1940

2082

1941

2083

if(not debug){

1942

2084

avahi_set_log_function(empty_log);

1943

2085

}

1944

2086

1945

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

1946

struct dirent **direntries;

1947

/* First look for interfaces that are up */

1948

ret = scandir(sys_class_net, &direntries, up_interface,

1949

alphasort);

1950

if(ret == 0){

1951

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

1952

free(direntries);

1953

ret = scandir(sys_class_net, &direntries, good_interface,

1954

alphasort);

1955

}

1956

if(ret >= 1){

1957

/* Pick the first interface returned */

1958

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

1959

if(debug){

1960

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

1961

}

1962

if(interface == NULL){

1963

perror_plus("malloc");

1964

free(direntries);

1965

exitcode = EXIT_FAILURE;

1966

goto end;

1967

}

1968

free(direntries);

1969

} else {

1970

free(direntries);

1971

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

1972

exitcode = EXIT_FAILURE;

1973

goto end;

1974

}

1975

}

1976

1977

2087

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

1978

2088

from the signal handler */

1979

2089

/* Initialize the pseudo-RNG for Avahi */

1980

2090

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

1981

mc.simple_poll = avahi_simple_poll_new();

1982

if(mc.simple_poll == NULL){

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1983

2093

fprintf_plus(stderr,

1984

2094

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

1985

2095

exitcode = EX_UNAVAILABLE;

2049

2159

}

2050

2160

}

2051

2161

2052

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

2053

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

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

2058

}

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

2208

}

2209

}

2210

break;

2211

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

2059

2237

}

2060

2238

2061

2239

if(quit_now){

2062

2240

goto end;

2063

2241

}

2064

2242

2065

ret = init_gnutls_global(pubkey, seckey);

2243

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

2066

2244

if(ret == -1){

2067

2245

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

2068

2246

exitcode = EX_UNAVAILABLE;

2085

2263

goto end;

2086

2264

}

2087

2265

2088

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

2266

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

2089

2267

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

2090

2268

exitcode = EX_UNAVAILABLE;

2091

2269

goto end;

2112

2290

goto end;

2113

2291

}

2114

2292

2115

uint16_t port;

2293

in_port_t port;

2116

2294

errno = 0;

2117

2295

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

2118

2296

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

2119

or tmpmax != (uint16_t)tmpmax){

2297

or tmpmax != (in_port_t)tmpmax){

2120

2298

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

2121

2299

exitcode = EX_USAGE;

2122

2300

goto end;

2123

2301

}

2124

2302

2125

2303

if(quit_now){

2126

2304

goto end;

2127

2305

}

2128

2306

2129

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2130

2308

*address = '\0';

2131

2309

/* Colon in address indicates IPv6 */

2132

2310

int af;

2148

2326

}

2149

2327

2150

2328

while(not quit_now){

2151

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

2329

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

2330

&mc);

2152

2331

if(quit_now or ret == 0){

2153

2332

break;

2154

2333

}

2156

2335

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

2157

2336

(int)retry_interval);

2158

2337

}

2159

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2160

2339

}

2161

2340

2162

2341

if (not quit_now){

2180

2359

config.publish_domain = 0;

2181

2360

2182

2361

/* Allocate a new server */

2183

mc.server = avahi_server_new(avahi_simple_poll_get

2184

(mc.simple_poll), &config, NULL,

2185

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2186

2364

2187

2365

/* Free the Avahi configuration data */

2188

2366

avahi_server_config_free(&config);

2191

2369

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

2192

2370

if(mc.server == NULL){

2193

2371

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

2194

avahi_strerror(error));

2372

avahi_strerror(ret_errno));

2195

2373

exitcode = EX_UNAVAILABLE;

2196

2374

goto end;

2197

2375

}

2203

2381

/* Create the Avahi service browser */

2204

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2205

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2206

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2207

2386

if(sb == NULL){

2208

2387

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

2209

2388

avahi_strerror(avahi_server_errno(mc.server)));

2221

2400

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

2222

2401

}

2223

2402

2224

ret = avahi_loop_with_timeout(mc.simple_poll,

2225

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2226

2405

if(debug){

2227

2406

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

2228

2407

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

2235

2414

}

2236

2415

2237

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2238

2419

if(sb != NULL)

2239

2420

avahi_s_service_browser_free(sb);

2240

2421

2241

2422

if(mc.server != NULL)

2242

2423

avahi_server_free(mc.server);

2243

2424

2244

if(mc.simple_poll != NULL)

2245

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2246

2427

2247

2428

if(gnutls_initialized){

2248

2429

gnutls_certificate_free_credentials(mc.cred);

2265

2446

}

2266

2447

}

2267

2448

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2270

2271

2449

/* Re-raise priviliges */

2272

2450

{

2273

2451

raise_privileges();

2274

2452

2275

/* Take down the network interface */

2276

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

2277

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

2278

if(ret == -1){

2279

perror_plus("ioctl SIOCGIFFLAGS");

2280

} else if(network.ifr_flags & IFF_UP){

2281

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

2282

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

2283

if(ret == -1){

2284

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2285

2467

}

2286

2468

}

2287

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

2288

if(ret == -1){

2289

perror_plus("close");

2469

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

2470

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

2471

" down\n");

2290

2472

}

2291

2473

}

2292

}

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2299

2480

2300

2481

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

2301

2482

if(tempdir_created){