/mandos/trunk : revision 546

41

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

61

*/

62

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

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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(),

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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

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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

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

663

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

664

bool match = false;

665

{

666

char *interface = NULL;

667

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

668

interface))){

669

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

670

match = true;

671

break;

672

}

673

}

674

}

675

if(not match){

676

if(debug){

677

char interface[IF_NAMESIZE];

678

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

679

perror_plus("if_indextoname");

680

} else {

681

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

682

" \"%s\"\n",

683

if_indextoname((unsigned int)if_index,

684

interface));

685

}

686

}

687

return -1;

688

}

689

}

690

691

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

692

659

if(ret != 0){

693

660

return -1;

694

661

}

695

662

696

663

if(debug){

697

664

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

698

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

665

PRIu16 "\n", ip, port);

699

666

}

700

667

701

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

732

699

goto mandos_end;

733

700

}

734

701

if(af == AF_INET6){

735

to.in6.sin6_port = htons(port);

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

736

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

737

707

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

738

708

-Wunreachable-code*/

762

732

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

763

733

perror_plus("if_indextoname");

764

734

} else {

765

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

766

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

735

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

736

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

767

737

}

768

738

} else {

769

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

770

ip, (uintmax_t)port);

739

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

740

ip, port);

771

741

}

772

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

773

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

851

821

goto mandos_end;

852

822

}

853

823

854

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

855

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

856

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

857

gnutls_transport_set_ptr(session,

858

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

859

826

860

827

if(quit_now){

861

828

errno = EINTR;

966

933

if(buffer_length > 0){

967

934

ssize_t decrypted_buffer_size;

968

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

969

&decrypted_buffer, mc);

936

&decrypted_buffer);

970

937

if(decrypted_buffer_size >= 0){

971

938

972

939

written = 0;

1033

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1034

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1035

1002

flags,

1036

void* mc){

1037

if(r == NULL){

1038

return;

1039

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1040

1005

1041

1006

/* Called whenever a service has been resolved successfully or

1042

1007

timed out */

1051

1016

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

1052

1017

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

1053

1018

domain,

1054

avahi_strerror(avahi_server_errno

1055

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1056

1020

break;

1057

1021

1058

1022

case AVAHI_RESOLVER_FOUND:

1064

1028

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

1065

1029

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

1066

1030

}

1067

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

1068

interface,

1069

avahi_proto_to_af(proto),

1070

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1071

1033

if(ret == 0){

1072

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1073

1035

} else {

1074

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

1075

avahi_proto_to_af(proto),

1076

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1077

1038

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

1078

1039

" list\n", name);

1079

1040

}

1092

1053

const char *domain,

1093

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1094

1055

flags,

1095

void* mc){

1096

if(b == NULL){

1097

return;

1098

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1099

1058

1100

1059

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

1101

1060

is removed from the LAN */

1109

1068

case AVAHI_BROWSER_FAILURE:

1110

1069

1111

1070

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

1112

avahi_strerror(avahi_server_errno

1113

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

1114

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1115

1073

return;

1116

1074

1117

1075

case AVAHI_BROWSER_NEW:

1120

1078

the callback function is called the Avahi server will free the

1121

1079

resolver for us. */

1122

1080

1123

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

1124

interface, protocol, name, type,

1125

domain, protocol, 0,

1126

resolve_callback, mc) == NULL)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1127

1084

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

1128

1085

" %s\n", name,

1129

avahi_strerror(avahi_server_errno

1130

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1131

1087

break;

1132

1088

1133

1089

case AVAHI_BROWSER_REMOVE:

1152

1108

signal_received = sig;

1153

1109

int old_errno = errno;

1154

1110

/* set main loop to exit */

1155

if(simple_poll != NULL){

1156

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1157

1113

}

1158

1114

errno = old_errno;

1159

1115

}

1160

1116

1161

1117

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

1162

1118

int ret;

1163

error_t ret_errno;

1164

1119

1165

1120

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

1166

1121

if(s < 0){

1167

ret_errno = errno;

1168

1122

perror_plus("socket");

1169

errno = ret_errno;

1170

1123

return false;

1171

1124

}

1172

1125

strcpy(ifr->ifr_name, ifname);

1173

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1174

1127

if(ret == -1){

1175

1128

if(debug){

1176

ret_errno = errno;

1177

1129

perror_plus("ioctl SIOCGIFFLAGS");

1178

errno = ret_errno;

1179

1130

}

1180

1131

return false;

1181

1132

}

1250

1201

}

1251

1202

1252

1203

/*

1253

* This function determines if a network interface is up.

1254

*/

1255

bool interface_is_up(const char *interface){

1256

struct ifreq ifr;

1257

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

1258

if(debug){

1259

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

1260

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

1261

}

1262

return false;

1263

}

1264

1265

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

1266

}

1267

1268

/*

1269

* This function determines if a network interface is running

1270

*/

1271

bool interface_is_running(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1282

1244

}

1283

1245

1284

1246

int notdotentries(const struct dirent *direntry){

1353

1315

return 1;

1354

1316

}

1355

1317

1356

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1357

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1358

1319

int ret;

1359

1320

struct timespec now;

1360

1321

struct timespec waited_time;

1361

1322

intmax_t block_time;

1362

1323

1363

1324

while(true){

1364

if(mc->current_server == NULL){

1325

if(mc.current_server == NULL){

1365

1326

if (debug){

1366

1327

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

1367

1328

" No timeout!\n");

1381

1342

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

1382

1343

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

1383

1344

waited_time.tv_sec = (now.tv_sec

1384

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

1345

- mc.current_server->last_seen.tv_sec);

1385

1346

waited_time.tv_nsec = (now.tv_nsec

1386

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

1347

- mc.current_server->last_seen.tv_nsec);

1387

1348

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

1388

1349

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

1389

1350

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

1397

1358

}

1398

1359

1399

1360

if(block_time <= 0){

1400

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

1401

mc->current_server->port,

1402

mc->current_server->if_index,

1403

mc->current_server->af, mc);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1404

1365

if(ret == 0){

1405

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1406

1367

return 0;

1407

1368

}

1408

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1409

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1410

1371

if(ret == -1){

1411

1372

perror_plus("clock_gettime");

1412

1373

return -1;

1413

1374

}

1414

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

1375

mc.current_server = mc.current_server->next;

1415

1376

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

1416

1377

servers, but don't block */

1417

1378

}

1426

1387

}

1427

1388

}

1428

1389

1429

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

1430

error_t raise_privileges(void){

1431

error_t old_errno = errno;

1432

error_t ret_errno = 0;

1433

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

1434

ret_errno = errno;

1435

perror_plus("seteuid");

1436

}

1437

errno = old_errno;

1438

return ret_errno;

1439

}

1440

1441

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

1442

error_t raise_privileges_permanently(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = raise_privileges();

1445

if(ret_errno != 0){

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t lower_privileges(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = 0;

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

/* Lower privileges permanently */

1470

error_t lower_privileges_permanently(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("setuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

1390

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

1482

1391

const float delay){

1483

1392

struct dirent **direntries;

1486

1395

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

1487

1396

alphasort);

1488

1397

if(numhooks == -1){

1489

if(errno == ENOENT){

1490

if(debug){

1491

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

1492

" found\n", hookdir);

1493

}

1494

} else {

1495

perror_plus("scandir");

1496

}

1398

perror_plus("scandir");

1497

1399

} else {

1498

1400

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

1499

1401

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

1512

1414

if(hook_pid == 0){

1513

1415

/* Child */

1514

1416

/* Raise privileges */

1515

raise_privileges_permanently();

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1516

1428

/* Set group */

1517

1429

errno = 0;

1518

1430

ret = setgid(0);

1611

1523

return true;

1612

1524

}

1613

1525

1614

error_t bring_up_interface(const char *const interface,

1615

const float delay){

1616

int sd = -1;

1617

error_t old_errno = errno;

1618

error_t ret_errno = 0;

1619

int ret, ret_setflags;

1620

struct ifreq network;

1621

unsigned int if_index = if_nametoindex(interface);

1622

if(if_index == 0){

1623

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

1624

errno = old_errno;

1625

return ENXIO;

1626

}

1627

1628

if(quit_now){

1629

errno = old_errno;

1630

return EINTR;

1631

}

1632

1633

if(not interface_is_up(interface)){

1634

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

1635

ret_errno = errno;

1636

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

1637

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

1638

return ret_errno;

1639

}

1640

network.ifr_flags |= IFF_UP;

1641

1642

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1643

if(sd < 0){

1644

ret_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return ret_errno;

1648

}

1649

1650

if(quit_now){

1651

close(sd);

1652

errno = old_errno;

1653

return EINTR;

1654

}

1655

1656

if(debug){

1657

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

1658

interface);

1659

}

1660

1661

/* Raise priviliges */

1662

raise_privileges();

1663

1664

#ifdef __linux__

1665

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1666

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

1667

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

1668

bool restore_loglevel = true;

1669

if(ret_linux == -1){

1670

restore_loglevel = false;

1671

perror_plus("klogctl");

1672

}

1673

#endif /* __linux__ */

1674

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

1675

ret_errno = errno;

1676

#ifdef __linux__

1677

if(restore_loglevel){

1678

ret_linux = klogctl(7, NULL, 0);

1679

if(ret_linux == -1){

1680

perror_plus("klogctl");

1681

}

1682

}

1683

#endif /* __linux__ */

1684

1685

/* Lower privileges */

1686

lower_privileges();

1687

1688

/* Close the socket */

1689

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

1690

if(ret == -1){

1691

perror_plus("close");

1692

}

1693

1694

if(ret_setflags == -1){

1695

errno = ret_errno;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

errno = old_errno;

1698

return ret_errno;

1699

}

1700

} else if(debug){

1701

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

1702

interface);

1703

}

1704

1705

/* Sleep checking until interface is running.

1706

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

1707

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

1708

if(interface_is_running(interface)){

1709

break;

1710

}

1711

struct timespec sleeptime = { .tv_nsec = 250000000 };

1712

ret = nanosleep(&sleeptime, NULL);

1713

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

1714

perror_plus("nanosleep");

1715

}

1716

}

1717

1718

errno = old_errno;

1719

return 0;

1720

}

1721

1722

error_t take_down_interface(const char *const interface){

1723

int sd = -1;

1724

error_t old_errno = errno;

1725

error_t ret_errno = 0;

1726

int ret, ret_setflags;

1727

struct ifreq network;

1728

unsigned int if_index = if_nametoindex(interface);

1729

if(if_index == 0){

1730

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

1731

errno = old_errno;

1732

return ENXIO;

1733

}

1734

if(interface_is_up(interface)){

1735

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

1736

ret_errno = errno;

1737

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

1738

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

1739

return ret_errno;

1740

}

1741

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

1742

1743

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1744

if(sd < 0){

1745

ret_errno = errno;

1746

perror_plus("socket");

1747

errno = old_errno;

1748

return ret_errno;

1749

}

1750

1751

if(debug){

1752

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

1753

interface);

1754

}

1755

1756

/* Raise priviliges */

1757

raise_privileges();

1758

1759

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

1760

ret_errno = errno;

1761

1762

/* Lower privileges */

1763

lower_privileges();

1764

1765

/* Close the socket */

1766

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

1767

if(ret == -1){

1768

perror_plus("close");

1769

}

1770

1771

if(ret_setflags == -1){

1772

errno = ret_errno;

1773

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1774

errno = old_errno;

1775

return ret_errno;

1776

}

1777

} else if(debug){

1778

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

1779

interface);

1780

}

1781

1782

errno = old_errno;

1783

return 0;

1784

}

1785

1786

1526

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

1787

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

1788

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

1789

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

1790

.interfaces = NULL, .interfaces_size = 0 };

1791

1527

AvahiSServiceBrowser *sb = NULL;

1792

error_t ret_errno;

1528

int error;

1793

1529

int ret;

1794

1530

intmax_t tmpmax;

1795

1531

char *tmp;

1796

1532

int exitcode = EXIT_SUCCESS;

1797

char *interfaces_to_take_down = NULL;

1798

size_t interfaces_to_take_down_size = 0;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1799

1539

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

1800

1540

bool tempdir_created = false;

1801

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1802

1542

const char *seckey = PATHDIR "/" SECKEY;

1803

1543

const char *pubkey = PATHDIR "/" PUBKEY;

1804

char *interfaces_hooks = NULL;

1805

size_t interfaces_hooks_size = 0;

1806

1544

1807

1545

bool gnutls_initialized = false;

1808

1546

bool gpgme_initialized = false;

1899

1637

connect_to = arg;

1900

1638

break;

1901

1639

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

1902

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

1903

arg, (int)',');

1904

if(ret_errno != 0){

1905

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

1906

}

1640

interface = arg;

1907

1641

break;

1908

1642

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

1909

1643

seckey = arg;

1987

1721

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

1988

1722

1989

1723

/* Re-raise priviliges */

1990

if(raise_privileges() == 0){

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1991

1729

struct stat st;

1992

1730

1993

1731

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

2033

1771

}

2034

1772

2035

1773

/* Lower privileges */

2036

lower_privileges();

2037

}

2038

}

2039

2040

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

2041

{

2042

char *interface = NULL;

2043

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

2044

interface))){

2045

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

2046

and if_nametoindex(interface) == 0){

2047

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

2048

fprintf_plus(stderr, "Not using nonexisting interface"

2049

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

2050

}

2051

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

2052

interface = NULL;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2053

1778

}

2054

1779

}

2055

1780

}

2056

1781

2057

1782

/* Run network hooks */

2058

{

2059

if(mc.interfaces != NULL){

2060

interfaces_hooks = malloc(mc.interfaces_size);

2061

if(interfaces_hooks == NULL){

2062

perror_plus("malloc");

2063

goto end;

2064

}

2065

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

2066

interfaces_hooks_size = mc.interfaces_size;

2067

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2068

(int)',');

2069

}

2070

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

2071

interfaces_hooks : "", delay)){

2072

goto end;

2073

}

1783

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

1784

goto end;

2074

1785

}

2075

1786

2076

1787

if(not debug){

2077

1788

avahi_set_log_function(empty_log);

2078

1789

}

2079

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2080

1823

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

2081

1824

from the signal handler */

2082

1825

/* Initialize the pseudo-RNG for Avahi */

2083

1826

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

2084

simple_poll = avahi_simple_poll_new();

2085

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2086

1829

fprintf_plus(stderr,

2087

1830

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

2088

1831

exitcode = EX_UNAVAILABLE;

2152

1895

}

2153

1896

}

2154

1897

2155

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

2156

if(mc.interfaces == NULL){

2157

struct dirent **direntries;

2158

/* Look for any good interfaces */

2159

ret = scandir(sys_class_net, &direntries, good_interface,

2160

alphasort);

2161

if(ret >= 1){

2162

/* Add all found interfaces to interfaces list */

2163

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

2164

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

2165

direntries[i]->d_name);

2166

if(ret_errno != 0){

2167

perror_plus("argz_add");

2168

continue;

2169

}

2170

if(debug){

2171

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

2172

direntries[i]->d_name);

2173

}

2174

}

2175

free(direntries);

2176

} else {

2177

free(direntries);

2178

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

2179

exitcode = EXIT_FAILURE;

2180

goto end;

2181

}

2182

}

2183

2184

/* Bring up interfaces which are down */

2185

{

2186

char *interface = NULL;

2187

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

2188

interface))){

2189

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

2190

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

2191

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

2192

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

2193

interface);

2194

interface = NULL;

2195

while((interface = argz_next(mc.interfaces,

2196

mc.interfaces_size, interface))){

2197

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

2198

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

2199

interface);

2200

interface = NULL;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2201

1983

}

2202

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2203

2002

break;

2204

2003

}

2205

bool interface_was_up = interface_is_up(interface);

2206

ret = bring_up_interface(interface, delay);

2207

if(not interface_was_up){

2208

if(ret != 0){

2209

errno = ret;

2210

perror_plus("Failed to bring up interface");

2211

} else {

2212

ret_errno = argz_add(&interfaces_to_take_down,

2213

&interfaces_to_take_down_size,

2214

interface);

2215

}

2216

}

2217

}

2218

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

2219

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

2220

}

2221

}

2222

2223

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

2224

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

2225

if(debug){

2226

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

2227

mc.interfaces);

2228

}

2229

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

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2230

2033

}

2231

2034

2232

2035

if(quit_now){

2233

2036

goto end;

2234

2037

}

2235

2038

2236

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

2039

ret = init_gnutls_global(pubkey, seckey);

2237

2040

if(ret == -1){

2238

2041

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

2239

2042

exitcode = EX_UNAVAILABLE;

2256

2059

goto end;

2257

2060

}

2258

2061

2259

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

2062

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

2260

2063

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

2261

2064

exitcode = EX_UNAVAILABLE;

2262

2065

goto end;

2272

2075

/* Connect directly, do not use Zeroconf */

2273

2076

/* (Mainly meant for debugging) */

2274

2077

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

2275

2276

2078

if(address == NULL){

2277

2079

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

2278

2080

exitcode = EX_USAGE;

2283

2085

goto end;

2284

2086

}

2285

2087

2286

in_port_t port;

2088

uint16_t port;

2287

2089

errno = 0;

2288

2090

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

2289

2091

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

2290

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2291

2093

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

2292

2094

exitcode = EX_USAGE;

2293

2095

goto end;

2294

2096

}

2295

2097

2296

2098

if(quit_now){

2297

2099

goto end;

2298

2100

}

2299

2101

2300

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2301

2103

*address = '\0';

2302

2104

/* Colon in address indicates IPv6 */

2303

2105

int af;

2319

2121

}

2320

2122

2321

2123

while(not quit_now){

2322

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

2323

&mc);

2124

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

2324

2125

if(quit_now or ret == 0){

2325

2126

break;

2326

2127

}

2352

2153

config.publish_domain = 0;

2353

2154

2354

2155

/* Allocate a new server */

2355

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2356

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2357

2159

2358

2160

/* Free the Avahi configuration data */

2359

2161

avahi_server_config_free(&config);

2362

2164

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

2363

2165

if(mc.server == NULL){

2364

2166

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

2365

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2366

2168

exitcode = EX_UNAVAILABLE;

2367

2169

goto end;

2368

2170

}

2374

2176

/* Create the Avahi service browser */

2375

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2376

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2377

NULL, 0, browse_callback,

2378

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2379

2180

if(sb == NULL){

2380

2181

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

2381

2182

avahi_strerror(avahi_server_errno(mc.server)));

2393

2194

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

2394

2195

}

2395

2196

2396

ret = avahi_loop_with_timeout(simple_poll,

2397

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

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2398

2199

if(debug){

2399

2200

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

2400

2201

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

2407

2208

}

2408

2209

2409

2210

/* Cleanup things */

2410

free(mc.interfaces);

2411

2412

2211

if(sb != NULL)

2413

2212

avahi_s_service_browser_free(sb);

2414

2213

2415

2214

if(mc.server != NULL)

2416

2215

avahi_server_free(mc.server);

2417

2216

2418

if(simple_poll != NULL)

2419

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2420

2219

2421

2220

if(gnutls_initialized){

2422

2221

gnutls_certificate_free_credentials(mc.cred);

2439

2238

}

2440

2239

}

2441

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2442

2244

/* Re-raise priviliges */

2443

2245

{

2444

raise_privileges();

2445

2446

/* Run network hooks */

2447

run_network_hooks("stop", interfaces_hooks != NULL ?

2448

interfaces_hooks : "", delay);

2449

2450

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

2451

{

2452

char *interface = NULL;

2453

while((interface=argz_next(interfaces_to_take_down,

2454

interfaces_to_take_down_size,

2455

interface))){

2456

ret_errno = take_down_interface(interface);

2457

if(ret_errno != 0){

2458

errno = ret_errno;

2459

perror_plus("Failed to take down interface");

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2460

2262

}

2461

2263

}

2462

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

2463

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

2464

" down\n");

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2465

2267

}

2466

2268

}

2467

2468

lower_privileges_permanently();

2469

}

2470

2471

free(interfaces_to_take_down);

2472

free(interfaces_hooks);

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2473

2276

2474

2277

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

2475

2278

if(tempdir_created){