/mandos/release : revision 237.7.202

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() */

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;

157

161

const char *priority;

158

162

gpgme_ctx_t ctx;

159

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

160

166

} mandos_context;

161

167

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 };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

167

170

168

171

sig_atomic_t quit_now = 0;

169

172

int signal_received = 0;

184

187

185

188

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

186

189

program_invocation_short_name));

187

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

190

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

188

191

}

189

192

190

193

/*

205

208

}

206

209

207

210

/* 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){

211

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

212

int af, server **current_server){

210

213

int ret;

211

214

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

212

215

if(new_server == NULL){

222

225

return false;

223

226

}

224

227

/* Special case of first server */

225

if (mc.current_server == NULL){

228

if(*current_server == NULL){

226

229

new_server->next = new_server;

227

230

new_server->prev = new_server;

228

mc.current_server = new_server;

231

*current_server = new_server;

229

232

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

230

233

} else {

231

new_server->next = mc.current_server;

232

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

234

new_server->next = *current_server;

235

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

233

236

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

235

238

}

236

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

239

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

237

240

if(ret == -1){

238

241

perror_plus("clock_gettime");

239

242

return false;

245

248

* Initialize GPGME.

246

249

*/

247

250

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

248

const char *tempdir){

251

const char *tempdir, mandos_context *mc){

249

252

gpgme_error_t rc;

250

253

gpgme_engine_info_t engine_info;

251

254

252

253

255

/*

254

256

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

255

257

*/

271

273

return false;

272

274

}

273

275

274

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

275

277

if(rc != GPG_ERR_NO_ERROR){

276

278

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

277

279

gpgme_strsource(rc), gpgme_strerror(rc));

321

323

}

322

324

323

325

/* Create new GPGME "context" */

324

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

326

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

325

327

if(rc != GPG_ERR_NO_ERROR){

326

328

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

327

329

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

342

344

*/

343

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

346

size_t crypto_size,

345

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

346

349

gpgme_data_t dh_crypto, dh_plain;

347

350

gpgme_error_t rc;

348

351

ssize_t ret;

374

377

375

378

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

376

379

data buffer */

377

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

380

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

378

381

if(rc != GPG_ERR_NO_ERROR){

379

382

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

380

383

gpgme_strsource(rc), gpgme_strerror(rc));

381

384

plaintext_length = -1;

382

385

if(debug){

383

386

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

385

388

if(result == NULL){

386

389

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

387

390

} else {

465

468

}

466

469

467

470

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

470

472

if(ret == NULL)

471

473

ret = "(unknown)";

472

474

return ret;

479

481

}

480

482

481

483

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

483

486

int ret;

484

487

485

488

if(debug){

502

505

}

503

506

504

507

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

509

if(ret != GNUTLS_E_SUCCESS){

507

510

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

508

511

safer_gnutls_strerror(ret));

518

521

}

519

522

520

523

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

522

525

GNUTLS_OPENPGP_FMT_BASE64);

523

526

if(ret != GNUTLS_E_SUCCESS){

524

527

fprintf_plus(stderr,

530

533

}

531

534

532

535

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

534

537

if(ret != GNUTLS_E_SUCCESS){

535

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

539

" initialization: %s\n",

537

540

safer_gnutls_strerror(ret));

538

541

goto globalfail;

539

542

}

540

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

543

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

541

544

if(ret != GNUTLS_E_SUCCESS){

542

545

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

543

546

safer_gnutls_strerror(ret));

544

547

goto globalfail;

545

548

}

546

549

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

548

551

549

552

return 0;

550

553

551

554

globalfail:

552

555

553

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

554

557

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

556

559

return -1;

557

560

}

558

561

559

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

560

564

int ret;

561

565

/* GnuTLS session creation */

562

566

do {

574

578

{

575

579

const char *err;

576

580

do {

577

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

581

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

578

582

if(quit_now){

579

583

gnutls_deinit(*session);

580

584

return -1;

591

595

592

596

do {

593

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

598

mc->cred);

595

599

if(quit_now){

596

600

gnutls_deinit(*session);

597

601

return -1;

607

611

/* ignore client certificate if any. */

608

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

613

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

615

612

616

return 0;

613

617

}

617

621

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

618

622

619

623

/* Called when a Mandos server is found */

620

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

624

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

621

625

AvahiIfIndex if_index,

622

int af){

626

int af, mandos_context *mc){

623

627

int ret, tcp_sd = -1;

624

628

ssize_t sret;

625

629

union {

655

659

return -1;

656

660

}

657

661

658

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);

659

695

if(ret != 0){

660

696

return -1;

661

697

}

662

698

663

699

if(debug){

664

700

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

665

PRIu16 "\n", ip, port);

701

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

666

702

}

667

703

668

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

699

735

goto mandos_end;

700

736

}

701

737

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

706

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

709

748

if(if_index == AVAHI_IF_UNSPEC){

710

749

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

711

750

" incomplete without a network interface\n");

716

755

to.in6.sin6_scope_id = (uint32_t)if_index;

717

756

}

718

757

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

758

to.in.sin_port = htons(port);

722

759

}

723

760

724

761

if(quit_now){

732

769

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

733

770

perror_plus("if_indextoname");

734

771

} else {

735

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

736

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

772

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

773

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

737

774

}

738

775

} else {

739

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

740

ip, port);

776

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

777

ip, (uintmax_t)port);

741

778

}

742

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

936

973

if(buffer_length > 0){

937

974

ssize_t decrypted_buffer_size;

938

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

939

&decrypted_buffer);

976

&decrypted_buffer, mc);

940

977

if(decrypted_buffer_size >= 0){

941

978

942

979

written = 0;

1003

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1004

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1005

1042

flags,

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1008

1047

1009

1048

/* Called whenever a service has been resolved successfully or

1010

1049

timed out */

1019

1058

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

1020

1059

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

1021

1060

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

1061

avahi_strerror(avahi_server_errno

1062

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

1023

1063

break;

1024

1064

1025

1065

case AVAHI_RESOLVER_FOUND:

1031

1071

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

1032

1072

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

1033

1073

}

1034

int ret = start_mandos_communication(ip, port, interface,

1035

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);

1036

1078

if(ret == 0){

1037

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1038

1080

} else {

1039

if(not add_server(ip, port, interface,

1040

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)){

1041

1084

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

1042

1085

" list\n", name);

1043

1086

}

1056

1099

const char *domain,

1057

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1101

flags,

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1061

1106

1062

1107

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

1063

1108

is removed from the LAN */

1071

1116

case AVAHI_BROWSER_FAILURE:

1072

1117

1073

1118

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

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);

1076

1122

return;

1077

1123

1078

1124

case AVAHI_BROWSER_NEW:

1081

1127

the callback function is called the Avahi server will free the

1082

1128

resolver for us. */

1083

1129

1084

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

1085

name, type, domain, protocol, 0,

1086

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)

1087

1134

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

1088

1135

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1136

avahi_strerror(avahi_server_errno

1137

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

1090

1138

break;

1091

1139

1092

1140

case AVAHI_BROWSER_REMOVE:

1111

1159

signal_received = sig;

1112

1160

int old_errno = errno;

1113

1161

/* set main loop to exit */

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1116

1164

}

1117

1165

errno = old_errno;

1118

1166

}

1119

1167

1120

1168

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

1121

1169

int ret;

1170

error_t ret_errno;

1122

1171

1123

1172

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

1124

1173

if(s < 0){

1174

ret_errno = errno;

1125

1175

perror_plus("socket");

1176

errno = ret_errno;

1126

1177

return false;

1127

1178

}

1128

1179

strcpy(ifr->ifr_name, ifname);

1129

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

1181

if(ret == -1){

1131

1182

if(debug){

1183

ret_errno = errno;

1132

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1133

1186

}

1134

1187

return false;

1135

1188

}

1204

1257

}

1205

1258

1206

1259

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

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);

1247

1289

}

1248

1290

1249

1291

int notdotentries(const struct dirent *direntry){

1318

1360

return 1;

1319

1361

}

1320

1362

1321

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){

1322

1365

int ret;

1323

1366

struct timespec now;

1324

1367

struct timespec waited_time;

1325

1368

intmax_t block_time;

1326

1369

1327

1370

while(true){

1328

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1329

1372

if (debug){

1330

1373

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

1331

1374

" No timeout!\n");

1345

1388

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

1346

1389

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

1347

1390

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1391

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

1349

1392

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1393

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

1351

1394

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

1352

1395

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

1353

1396

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

1361

1404

}

1362

1405

1363

1406

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1407

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);

1368

1411

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1370

1413

return 0;

1371

1414

}

1372

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1374

1417

if(ret == -1){

1375

1418

perror_plus("clock_gettime");

1376

1419

return -1;

1377

1420

}

1378

mc.current_server = mc.current_server->next;

1421

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

1379

1422

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

1380

1423

servers, but don't block */

1381

1424

}

1390

1433

}

1391

1434

}

1392

1435

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

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

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1393

1488

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

1394

1489

const float delay){

1395

1490

struct dirent **direntries;

1398

1493

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

1399

1494

alphasort);

1400

1495

if(numhooks == -1){

1401

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

}

1402

1504

} else {

1403

1505

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

1404

1506

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

1417

1519

if(hook_pid == 0){

1418

1520

/* Child */

1419

1521

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1522

raise_privileges_permanently();

1431

1523

/* Set group */

1432

1524

errno = 0;

1433

1525

ret = setgid(0);

1526

1618

return true;

1527

1619

}

1528

1620

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

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

}

1647

network.ifr_flags |= IFF_UP;

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));

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

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;

1740

}

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));

1774

if(ret == -1){

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);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1529

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 };

1530

1798

AvahiSServiceBrowser *sb = NULL;

1531

int error;

1799

error_t ret_errno;

1532

1800

int ret;

1533

1801

intmax_t tmpmax;

1534

1802

char *tmp;

1535

1803

int exitcode = EXIT_SUCCESS;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1542

1806

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

1543

1807

bool tempdir_created = false;

1544

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1545

1809

const char *seckey = PATHDIR "/" SECKEY;

1546

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1547

1813

1548

1814

bool gnutls_initialized = false;

1549

1815

bool gpgme_initialized = false;

1640

1906

connect_to = arg;

1641

1907

break;

1642

1908

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

1643

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

}

1644

1914

break;

1645

1915

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

1646

1916

seckey = arg;

1724

1994

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

1725

1995

1726

1996

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1997

if(raise_privileges() == 0){

1732

1998

struct stat st;

1733

1999

1734

2000

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

1774

2040

}

1775

2041

1776

2042

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

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;

1781

2060

}

1782

2061

}

1783

2062

}

1784

2063

1785

2064

/* Run network hooks */

1786

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

1787

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

}

1788

2081

}

1789

2082

1790

2083

if(not debug){

1791

2084

avahi_set_log_function(empty_log);

1792

2085

}

1793

2086

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

1826

2087

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

1827

2088

from the signal handler */

1828

2089

/* Initialize the pseudo-RNG for Avahi */

1829

2090

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

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1832

2093

fprintf_plus(stderr,

1833

2094

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

1834

2095

exitcode = EX_UNAVAILABLE;

1898

2159

}

1899

2160

}

1900

2161

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

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;

1986

2208

}

1987

2209

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2005

2210

break;

2006

2211

}

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2035

}

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);

2036

2237

}

2037

2238

2038

2239

if(quit_now){

2039

2240

goto end;

2040

2241

}

2041

2242

2042

ret = init_gnutls_global(pubkey, seckey);

2243

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

2043

2244

if(ret == -1){

2044

2245

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

2045

2246

exitcode = EX_UNAVAILABLE;

2062

2263

goto end;

2063

2264

}

2064

2265

2065

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

2266

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

2066

2267

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

2067

2268

exitcode = EX_UNAVAILABLE;

2068

2269

goto end;

2078

2279

/* Connect directly, do not use Zeroconf */

2079

2280

/* (Mainly meant for debugging) */

2080

2281

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

2282

2081

2283

if(address == NULL){

2082

2284

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

2083

2285

exitcode = EX_USAGE;

2088

2290

goto end;

2089

2291

}

2090

2292

2091

uint16_t port;

2293

in_port_t port;

2092

2294

errno = 0;

2093

2295

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

2094

2296

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

2095

or tmpmax != (uint16_t)tmpmax){

2297

or tmpmax != (in_port_t)tmpmax){

2096

2298

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

2097

2299

exitcode = EX_USAGE;

2098

2300

goto end;

2099

2301

}

2100

2302

2101

2303

if(quit_now){

2102

2304

goto end;

2103

2305

}

2104

2306

2105

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2106

2308

*address = '\0';

2107

2309

/* Colon in address indicates IPv6 */

2108

2310

int af;

2124

2326

}

2125

2327

2126

2328

while(not quit_now){

2127

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

2329

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

2330

&mc);

2128

2331

if(quit_now or ret == 0){

2129

2332

break;

2130

2333

}

2132

2335

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

2133

2336

(int)retry_interval);

2134

2337

}

2135

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2136

2339

}

2137

2340

2138

2341

if (not quit_now){

2156

2359

config.publish_domain = 0;

2157

2360

2158

2361

/* Allocate a new server */

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2162

2364

2163

2365

/* Free the Avahi configuration data */

2164

2366

avahi_server_config_free(&config);

2167

2369

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

2168

2370

if(mc.server == NULL){

2169

2371

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

2170

avahi_strerror(error));

2372

avahi_strerror(ret_errno));

2171

2373

exitcode = EX_UNAVAILABLE;

2172

2374

goto end;

2173

2375

}

2179

2381

/* Create the Avahi service browser */

2180

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2181

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2182

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2183

2386

if(sb == NULL){

2184

2387

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

2185

2388

avahi_strerror(avahi_server_errno(mc.server)));

2197

2400

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

2198

2401

}

2199

2402

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2202

2405

if(debug){

2203

2406

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

2204

2407

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

2211

2414

}

2212

2415

2213

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2214

2419

if(sb != NULL)

2215

2420

avahi_s_service_browser_free(sb);

2216

2421

2217

2422

if(mc.server != NULL)

2218

2423

avahi_server_free(mc.server);

2219

2424

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2222

2427

2223

2428

if(gnutls_initialized){

2224

2429

gnutls_certificate_free_credentials(mc.cred);

2241

2446

}

2242

2447

}

2243

2448

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

2449

/* Re-raise priviliges */

2248

2450

{

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

2253

}

2254

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2451

raise_privileges();

2452

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");

2265

2467

}

2266

2468

}

2267

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

2268

if(ret == -1){

2269

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");

2270

2472

}

2271

2473

}

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2279

2480

2280

2481

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

2281

2482

if(tempdir_created){