/mandos/release : revision 237.7.150

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

41

42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

61

*/

62

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

63

strtoimax() */

64

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

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(),

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argz_stringify(), argz_add(),

93

argz_count() */

91

94

92

95

#ifdef __linux__

93

96

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

135

138

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

136

139

char *connect_to = NULL;

137

140

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

138

143

139

144

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

140

145

typedef struct server{

141

146

const char *ip;

142

uint16_t port;

147

in_port_t port;

143

148

AvahiIfIndex if_index;

144

149

int af;

145

150

struct timespec last_seen;

149

154

150

155

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

151

156

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

157

AvahiServer *server;

154

158

gnutls_certificate_credentials_t cred;

155

159

unsigned int dh_bits;

159

163

server *current_server;

160

164

} mandos_context;

161

165

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 };

166

/* global so signal handler can reach it*/

167

AvahiSimplePoll *simple_poll;

167

168

169

sig_atomic_t quit_now = 0;

169

170

int signal_received = 0;

205

206

}

206

207

208

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

208

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

209

int af){

209

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

210

int af, server **current_server){

210

211

int ret;

211

212

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

212

213

if(new_server == NULL){

222

223

return false;

223

224

}

224

225

/* Special case of first server */

225

if (mc.current_server == NULL){

226

if(*current_server == NULL){

226

227

new_server->next = new_server;

227

228

new_server->prev = new_server;

228

mc.current_server = new_server;

229

*current_server = new_server;

229

230

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

230

231

} else {

231

new_server->next = mc.current_server;

232

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

232

new_server->next = *current_server;

233

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

233

234

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

(*current_server)->prev = new_server;

235

236

}

236

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

237

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

237

238

if(ret == -1){

238

239

perror_plus("clock_gettime");

239

240

return false;

245

246

* Initialize GPGME.

246

247

*/

247

248

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

248

const char *tempdir){

249

const char *tempdir, mandos_context *mc){

249

250

gpgme_error_t rc;

250

251

gpgme_engine_info_t engine_info;

251

252

253

/*

254

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

255

*/

271

return false;

272

}

273

274

rc = gpgme_op_import(mc.ctx, pgp_data);

274

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

275

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

321

}

322

323

/* Create new GPGME "context" */

324

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

324

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

325

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

342

*/

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

size_t crypto_size,

345

char **plaintext){

345

char **plaintext,

346

mandos_context *mc){

346

347

gpgme_data_t dh_crypto, dh_plain;

347

348

gpgme_error_t rc;

348

349

ssize_t ret;

374

375

376

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

376

377

data buffer */

377

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

378

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

378

379

if(rc != GPG_ERR_NO_ERROR){

379

380

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

380

381

gpgme_strsource(rc), gpgme_strerror(rc));

381

382

plaintext_length = -1;

382

383

if(debug){

383

384

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

385

result = gpgme_op_decrypt_result(mc->ctx);

385

386

if(result == NULL){

386

387

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

387

388

} else {

465

466

}

466

467

468

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

469

const char *ret = gnutls_strerror(value);

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

479

}

480

481

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

482

const char *seckeyfilename,

483

mandos_context *mc){

483

484

int ret;

484

485

486

if(debug){

502

503

}

503

504

505

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

507

if(ret != GNUTLS_E_SUCCESS){

507

508

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

508

509

safer_gnutls_strerror(ret));

518

519

}

519

520

521

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

522

(mc->cred, pubkeyfilename, seckeyfilename,

522

523

GNUTLS_OPENPGP_FMT_BASE64);

523

524

if(ret != GNUTLS_E_SUCCESS){

524

525

fprintf_plus(stderr,

530

531

}

531

532

533

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

534

ret = gnutls_dh_params_init(&mc->dh_params);

534

535

if(ret != GNUTLS_E_SUCCESS){

535

536

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

537

" initialization: %s\n",

537

538

safer_gnutls_strerror(ret));

538

539

goto globalfail;

539

540

}

540

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

541

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

541

542

if(ret != GNUTLS_E_SUCCESS){

542

543

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

543

544

safer_gnutls_strerror(ret));

544

545

goto globalfail;

545

546

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

548

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

548

549

550

return 0;

550

551

552

globalfail:

552

553

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_certificate_free_credentials(mc->cred);

554

555

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

556

gnutls_dh_params_deinit(mc->dh_params);

556

557

return -1;

557

558

}

558

559

static int init_gnutls_session(gnutls_session_t *session){

560

static int init_gnutls_session(gnutls_session_t *session,

561

mandos_context *mc){

560

562

int ret;

561

563

/* GnuTLS session creation */

562

564

do {

574

576

{

575

577

const char *err;

576

578

do {

577

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

579

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

578

580

if(quit_now){

579

581

gnutls_deinit(*session);

580

582

return -1;

591

593

592

594

do {

593

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

596

mc->cred);

595

597

if(quit_now){

596

598

gnutls_deinit(*session);

597

599

return -1;

607

609

/* ignore client certificate if any. */

608

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

611

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

612

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

613

612

614

return 0;

613

615

}

617

619

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

618

620

619

621

/* Called when a Mandos server is found */

620

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

622

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

621

623

AvahiIfIndex if_index,

622

int af){

624

int af, mandos_context *mc){

623

625

int ret, tcp_sd = -1;

624

626

ssize_t sret;

625

627

union {

655

657

return -1;

656

658

}

657

659

658

ret = init_gnutls_session(&session);

660

ret = init_gnutls_session(&session, mc);

659

661

if(ret != 0){

660

662

return -1;

661

663

}

662

664

663

665

if(debug){

664

666

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

665

PRIu16 "\n", ip, port);

667

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

666

668

}

667

669

668

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

699

701

goto mandos_end;

700

702

}

701

703

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

704

to.in6.sin6_port = htons(port);

706

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

706

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

708

707

-Wunreachable-code*/

732

731

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

733

732

perror_plus("if_indextoname");

734

733

} else {

735

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

736

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

734

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

735

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

737

736

}

738

737

} else {

739

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

740

ip, port);

738

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

739

ip, (uintmax_t)port);

741

740

}

742

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

821

820

goto mandos_end;

822

821

}

823

822

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

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

824

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

825

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

826

gnutls_transport_set_ptr(session,

827

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

828

827

829

if(quit_now){

828

830

errno = EINTR;

933

935

if(buffer_length > 0){

934

936

ssize_t decrypted_buffer_size;

935

937

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

938

&decrypted_buffer, mc);

937

939

if(decrypted_buffer_size >= 0){

938

940

939

941

written = 0;

1000

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1004

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1005

void* mc){

1006

if(r == NULL){

1007

return;

1008

}

1005

1009

1006

1010

/* Called whenever a service has been resolved successfully or

1007

1011

timed out */

1016

1020

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

1017

1021

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

1018

1022

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1023

avahi_strerror(avahi_server_errno

1024

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

1020

1025

break;

1021

1026

1022

1027

case AVAHI_RESOLVER_FOUND:

1028

1033

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

1029

1034

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

1030

1035

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1036

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

1037

interface,

1038

avahi_proto_to_af(proto),

1039

mc);

1033

1040

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1041

avahi_simple_poll_quit(simple_poll);

1035

1042

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1043

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

1044

avahi_proto_to_af(proto),

1045

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

1038

1046

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

1039

1047

" list\n", name);

1040

1048

}

1053

1061

const char *domain,

1054

1062

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1063

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1064

void* mc){

1065

if(b == NULL){

1066

return;

1067

}

1058

1068

1059

1069

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

1060

1070

is removed from the LAN */

1068

1078

case AVAHI_BROWSER_FAILURE:

1069

1079

1070

1080

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1081

avahi_strerror(avahi_server_errno

1082

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

1083

avahi_simple_poll_quit(simple_poll);

1073

1084

return;

1074

1085

1075

1086

case AVAHI_BROWSER_NEW:

1078

1089

the callback function is called the Avahi server will free the

1079

1090

resolver for us. */

1080

1091

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1092

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

1093

interface, protocol, name, type,

1094

domain, protocol, 0,

1095

resolve_callback, mc) == NULL)

1084

1096

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

1085

1097

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1098

avahi_strerror(avahi_server_errno

1099

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

1087

1100

break;

1088

1101

1089

1102

case AVAHI_BROWSER_REMOVE:

1108

1121

signal_received = sig;

1109

1122

int old_errno = errno;

1110

1123

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1124

if(simple_poll != NULL){

1125

avahi_simple_poll_quit(simple_poll);

1113

1126

}

1114

1127

errno = old_errno;

1115

1128

}

1116

1129

1117

1130

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

1118

1131

int ret;

1132

error_t ret_errno;

1119

1133

1120

1134

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

1121

1135

if(s < 0){

1136

ret_errno = errno;

1122

1137

perror_plus("socket");

1138

errno = ret_errno;

1123

1139

return false;

1124

1140

}

1125

1141

strcpy(ifr->ifr_name, ifname);

1126

1142

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1143

if(ret == -1){

1128

1144

if(debug){

1145

ret_errno = errno;

1129

1146

perror_plus("ioctl SIOCGIFFLAGS");

1147

errno = ret_errno;

1130

1148

}

1131

1149

return false;

1132

1150

}

1201

1219

}

1202

1220

1203

1221

/*

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;

1222

* This function determines if a network interface is up.

1223

*/

1224

bool interface_is_up(const char *interface){

1225

struct ifreq ifr;

1226

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

1227

if(debug){

1228

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

1229

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

1230

}

1231

return false;

1232

}

1233

1234

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

1235

}

1236

1237

/*

1238

* This function determines if a network interface is running

1239

*/

1240

bool interface_is_running(const char *interface){

1241

struct ifreq ifr;

1242

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

1243

if(debug){

1244

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

1245

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

1246

}

1247

return false;

1248

}

1249

1250

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

1244

1251

}

1245

1252

1246

1253

int notdotentries(const struct dirent *direntry){

1315

1322

return 1;

1316

1323

}

1317

1324

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1326

mandos_context *mc){

1319

1327

int ret;

1320

1328

struct timespec now;

1321

1329

struct timespec waited_time;

1322

1330

intmax_t block_time;

1323

1331

1324

1332

while(true){

1325

if(mc.current_server == NULL){

1333

if(mc->current_server == NULL){

1326

1334

if (debug){

1327

1335

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

1328

1336

" No timeout!\n");

1342

1350

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

1343

1351

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

1344

1352

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1353

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

1346

1354

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1355

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

1348

1356

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

1349

1357

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

1350

1358

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

1358

1366

}

1359

1367

1360

1368

if(block_time <= 0){

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);

1369

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

1370

mc->current_server->port,

1371

mc->current_server->if_index,

1372

mc->current_server->af, mc);

1365

1373

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1374

avahi_simple_poll_quit(s);

1367

1375

return 0;

1368

1376

}

1369

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1378

&mc->current_server->last_seen);

1371

1379

if(ret == -1){

1372

1380

perror_plus("clock_gettime");

1373

1381

return -1;

1374

1382

}

1375

mc.current_server = mc.current_server->next;

1383

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

1376

1384

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

1377

1385

servers, but don't block */

1378

1386

}

1387

1395

}

1388

1396

}

1389

1397

1398

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

1399

error_t raise_privileges(void){

1400

error_t old_errno = errno;

1401

error_t ret_errno = 0;

1402

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

1403

ret_errno = errno;

1404

perror_plus("seteuid");

1405

}

1406

errno = old_errno;

1407

return ret_errno;

1408

}

1409

1410

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

1411

error_t raise_privileges_permanently(void){

1412

error_t old_errno = errno;

1413

error_t ret_errno = raise_privileges();

1414

if(ret_errno != 0){

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

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

1419

ret_errno = errno;

1420

perror_plus("seteuid");

1421

}

1422

errno = old_errno;

1423

return ret_errno;

1424

}

1425

1426

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

1427

error_t lower_privileges(void){

1428

error_t old_errno = errno;

1429

error_t ret_errno = 0;

1430

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

1431

ret_errno = errno;

1432

perror_plus("seteuid");

1433

}

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

/* Lower privileges permanently */

1439

error_t lower_privileges_permanently(void){

1440

error_t old_errno = errno;

1441

error_t ret_errno = 0;

1442

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

1443

ret_errno = errno;

1444

perror_plus("setuid");

1445

}

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

1390

1450

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

1391

1451

const float delay){

1392

1452

struct dirent **direntries;

1395

1455

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

1396

1456

alphasort);

1397

1457

if(numhooks == -1){

1398

perror_plus("scandir");

1458

if(errno == ENOENT){

1459

if(debug){

1460

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

1461

" found\n", hookdir);

1462

}

1463

} else {

1464

perror_plus("scandir");

1465

}

1399

1466

} else {

1400

1467

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

1401

1468

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

1414

1481

if(hook_pid == 0){

1415

1482

/* Child */

1416

1483

/* Raise privileges */

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

}

1484

raise_privileges_permanently();

1428

1485

/* Set group */

1429

1486

errno = 0;

1430

1487

ret = setgid(0);

1450

1507

perror_plus("setenv");

1451

1508

_exit(EX_OSERR);

1452

1509

}

1453

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

1510

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

1454

1511

if(ret == -1){

1455

1512

perror_plus("setenv");

1456

1513

_exit(EX_OSERR);

1473

1530

_exit(EX_OSERR);

1474

1531

}

1475

1532

free(delaystring);

1533

if(connect_to != NULL){

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

}

1476

1540

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

1477

1541

perror_plus("execl");

1478

1542

_exit(EXIT_FAILURE);

1516

1580

return true;

1517

1581

}

1518

1582

1583

error_t bring_up_interface(const char *const interface,

1584

const float delay){

1585

int sd = -1;

1586

error_t old_errno = errno;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1589

struct ifreq network;

1590

unsigned int if_index = if_nametoindex(interface);

1591

if(if_index == 0){

1592

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

1593

errno = old_errno;

1594

return ENXIO;

1595

}

1596

1597

if(quit_now){

1598

errno = old_errno;

1599

return EINTR;

1600

}

1601

1602

if(not interface_is_up(interface)){

1603

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

1604

ret_errno = errno;

1605

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

1606

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

1607

return ret_errno;

1608

}

1609

network.ifr_flags |= IFF_UP;

1610

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1613

ret_errno = errno;

1614

perror_plus("socket");

1615

errno = old_errno;

1616

return ret_errno;

1617

}

1618

1619

if(quit_now){

1620

close(sd);

1621

errno = old_errno;

1622

return EINTR;

1623

}

1624

1625

if(debug){

1626

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

1627

interface);

1628

}

1629

1630

/* Raise priviliges */

1631

raise_privileges();

1632

1633

#ifdef __linux__

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

1641

}

1642

#endif /* __linux__ */

1643

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

1644

ret_errno = errno;

1645

#ifdef __linux__

1646

if(restore_loglevel){

1647

ret_linux = klogctl(7, NULL, 0);

1648

if(ret_linux == -1){

1649

perror_plus("klogctl");

1650

}

1651

}

1652

#endif /* __linux__ */

1653

1654

/* Lower privileges */

1655

lower_privileges();

1656

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

1661

}

1662

1663

if(ret_setflags == -1){

1664

errno = ret_errno;

1665

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1666

errno = old_errno;

1667

return ret_errno;

1668

}

1669

} else if(debug){

1670

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

1671

interface);

1672

}

1673

1674

/* Sleep checking until interface is running.

1675

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

1676

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

1677

if(interface_is_running(interface)){

1678

break;

1679

}

1680

struct timespec sleeptime = { .tv_nsec = 250000000 };

1681

ret = nanosleep(&sleeptime, NULL);

1682

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

1683

perror_plus("nanosleep");

1684

}

1685

}

1686

1687

errno = old_errno;

1688

return 0;

1689

}

1690

1691

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1693

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1696

struct ifreq network;

1697

unsigned int if_index = if_nametoindex(interface);

1698

if(if_index == 0){

1699

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

1700

errno = old_errno;

1701

return ENXIO;

1702

}

1703

if(interface_is_up(interface)){

1704

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

1705

ret_errno = errno;

1706

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

1707

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

1708

return ret_errno;

1709

}

1710

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

1711

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1714

ret_errno = errno;

1715

perror_plus("socket");

1716

errno = old_errno;

1717

return ret_errno;

1718

}

1719

1720

if(debug){

1721

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

1722

interface);

1723

}

1724

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

1733

1734

/* Close the socket */

1735

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

1736

if(ret == -1){

1737

perror_plus("close");

1738

}

1739

1740

if(ret_setflags == -1){

1741

errno = ret_errno;

1742

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1743

errno = old_errno;

1744

return ret_errno;

1745

}

1746

} else if(debug){

1747

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

1748

interface);

1749

}

1750

1751

errno = old_errno;

1752

return 0;

1753

}

1754

1519

1755

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

1756

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

1757

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

1758

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

1520

1759

AvahiSServiceBrowser *sb = NULL;

1521

int error;

1760

error_t ret_errno;

1522

1761

int ret;

1523

1762

intmax_t tmpmax;

1524

1763

char *tmp;

1525

1764

int exitcode = EXIT_SUCCESS;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

1767

char *interfaces_to_take_down = NULL;

1768

size_t interfaces_to_take_down_size = 0;

1532

1769

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

1533

1770

bool tempdir_created = false;

1534

1771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1535

1772

const char *seckey = PATHDIR "/" SECKEY;

1536

1773

const char *pubkey = PATHDIR "/" PUBKEY;

1774

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

1537

1776

1538

1777

bool gnutls_initialized = false;

1539

1778

bool gpgme_initialized = false;

1601

1840

.group = 2 },

1602

1841

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

1603

1842

.arg = "SECONDS",

1604

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

1843

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

1605

1844

.group = 2 },

1606

1845

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

1607

1846

.arg = "DIR",

1630

1869

connect_to = arg;

1631

1870

break;

1632

1871

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

1633

interface = arg;

1872

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

1873

(int)',');

1874

if(ret_errno != 0){

1875

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

1876

}

1634

1877

break;

1635

1878

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

1636

1879

seckey = arg;

1714

1957

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

1715

1958

1716

1959

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1960

if(raise_privileges() == 0){

1722

1961

struct stat st;

1723

1962

1724

1963

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

1772

2011

}

1773

2012

}

1774

2013

2014

/* Remove empty interface names */

2015

{

2016

char *interface = NULL;

2017

while((interface = argz_next(interfaces, interfaces_size,

2018

interface))){

2019

if(if_nametoindex(interface) == 0){

2020

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

2021

fprintf_plus(stderr, "Not using nonexisting interface"

2022

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

2023

}

2024

argz_delete(&interfaces, &interfaces_size, interface);

2025

interface = NULL;

2026

}

2027

}

2028

}

2029

1775

2030

/* Run network hooks */

1776

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

1777

goto end;

2031

{

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2035

if(interfaces_hooks == NULL){

2036

perror_plus("malloc");

2037

goto end;

2038

}

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

1778

2048

}

1779

2049

1780

2050

if(not debug){

1781

2051

avahi_set_log_function(empty_log);

1782

2052

}

1783

2053

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1816

2054

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

1817

2055

from the signal handler */

1818

2056

/* Initialize the pseudo-RNG for Avahi */

1819

2057

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

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2058

simple_poll = avahi_simple_poll_new();

2059

if(simple_poll == NULL){

1822

2060

fprintf_plus(stderr,

1823

2061

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

1824

2062

exitcode = EX_UNAVAILABLE;

1888

2126

}

1889

2127

}

1890

2128

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

1976

}

1977

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

1995

break;

1996

}

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2129

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

2130

if(interfaces == NULL){

2131

struct dirent **direntries;

2132

/* Look for any good interfaces */

2133

ret = scandir(sys_class_net, &direntries, good_interface,

2134

alphasort);

2135

if(ret >= 1){

2136

/* Add all found interfaces to interfaces list */

2137

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2139

direntries[i]->d_name);

2140

if(ret_errno != 0){

2141

perror_plus("argz_add");

2142

continue;

2143

}

2144

if(debug){

2145

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

2146

direntries[i]->d_name);

2147

}

2148

}

2149

free(direntries);

2150

} else {

2151

free(direntries);

2152

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

2153

exitcode = EXIT_FAILURE;

2154

goto end;

2155

}

2156

}

2157

2158

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

2159

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

2160

if(debug){

2161

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

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

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

2169

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

2170

char *interface = NULL;

2171

while((interface = argz_next(interfaces, interfaces_size,

2172

interface))){

2173

bool interface_was_up = interface_is_up(interface);

2174

ret = bring_up_interface(interface, delay);

2175

if(not interface_was_up){

2176

if(ret != 0){

2177

errno = ret;

2178

perror_plus("Failed to bring up interface");

2179

} else {

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2183

}

2184

}

2185

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2189

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

2190

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

2025

2191

}

2026

2192

}

2027

2193

2029

2195

goto end;

2030

2196

}

2031

2197

2032

ret = init_gnutls_global(pubkey, seckey);

2198

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

2033

2199

if(ret == -1){

2034

2200

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

2035

2201

exitcode = EX_UNAVAILABLE;

2052

2218

goto end;

2053

2219

}

2054

2220

2055

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

2221

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

2056

2222

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

2057

2223

exitcode = EX_UNAVAILABLE;

2058

2224

goto end;

2068

2234

/* Connect directly, do not use Zeroconf */

2069

2235

/* (Mainly meant for debugging) */

2070

2236

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

2237

2071

2238

if(address == NULL){

2072

2239

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

2073

2240

exitcode = EX_USAGE;

2078

2245

goto end;

2079

2246

}

2080

2247

2081

uint16_t port;

2248

in_port_t port;

2082

2249

errno = 0;

2083

2250

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

2084

2251

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

2085

or tmpmax != (uint16_t)tmpmax){

2252

or tmpmax != (in_port_t)tmpmax){

2086

2253

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

2087

2254

exitcode = EX_USAGE;

2088

2255

goto end;

2092

2259

goto end;

2093

2260

}

2094

2261

2095

port = (uint16_t)tmpmax;

2262

port = (in_port_t)tmpmax;

2096

2263

*address = '\0';

2097

2264

/* Colon in address indicates IPv6 */

2098

2265

int af;

2114

2281

}

2115

2282

2116

2283

while(not quit_now){

2117

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

2284

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

2285

&mc);

2118

2286

if(quit_now or ret == 0){

2119

2287

break;

2120

2288

}

2146

2314

config.publish_domain = 0;

2147

2315

2148

2316

/* Allocate a new server */

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2317

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2318

&config, NULL, NULL, &ret_errno);

2152

2319

2153

2320

/* Free the Avahi configuration data */

2154

2321

avahi_server_config_free(&config);

2157

2324

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

2158

2325

if(mc.server == NULL){

2159

2326

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

2160

avahi_strerror(error));

2327

avahi_strerror(ret_errno));

2161

2328

exitcode = EX_UNAVAILABLE;

2162

2329

goto end;

2163

2330

}

2169

2336

/* Create the Avahi service browser */

2170

2337

sb = avahi_s_service_browser_new(mc.server, if_index,

2171

2338

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2172

NULL, 0, browse_callback, NULL);

2339

NULL, 0, browse_callback,

2340

(void *)&mc);

2173

2341

if(sb == NULL){

2174

2342

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

2175

2343

avahi_strerror(avahi_server_errno(mc.server)));

2187

2355

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

2188

2356

}

2189

2357

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2358

ret = avahi_loop_with_timeout(simple_poll,

2359

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

2192

2360

if(debug){

2193

2361

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

2194

2362

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

2207

2375

if(mc.server != NULL)

2208

2376

avahi_server_free(mc.server);

2209

2377

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2378

if(simple_poll != NULL)

2379

avahi_simple_poll_free(simple_poll);

2212

2380

2213

2381

if(gnutls_initialized){

2214

2382

gnutls_certificate_free_credentials(mc.cred);

2231

2399

}

2232

2400

}

2233

2401

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

2402

/* Re-raise priviliges */

2238

2403

{

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2243

}

2244

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2255

2420

}

2256

2421

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2422

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

2423

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

2424

" down\n");

2260

2425

}

2261

2426

}

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2427

2428

lower_privileges_permanently();

2429

}

2430

2431

free(interfaces_to_take_down);

2432

free(interfaces_hooks);

2269

2433

2270

2434

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

2271

2435

if(tempdir_created){