/mandos/release : revision 237.7.184

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

61

*/

62

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

63

strtoimax() */

64

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

65

64

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

66

65

program_invocation_short_name */

67

66

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

88

87

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

89

88

WEXITSTATUS(), WTERMSIG() */

90

89

#include <grp.h> /* setgroups() */

90

#include <argz.h> /* argz_add_sep(), argz_next(),

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

91

94

92

95

#ifdef __linux__

93

96

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

141

144

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

142

145

typedef struct server{

143

146

const char *ip;

144

uint16_t port;

147

in_port_t port;

145

148

AvahiIfIndex if_index;

146

149

int af;

147

150

struct timespec last_seen;

151

154

152

155

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

153

156

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

157

AvahiServer *server;

156

158

gnutls_certificate_credentials_t cred;

157

159

unsigned int dh_bits;

159

161

const char *priority;

160

162

gpgme_ctx_t ctx;

161

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

162

166

} mandos_context;

163

167

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

169

170

171

sig_atomic_t quit_now = 0;

171

172

int signal_received = 0;

186

187

188

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

188

189

program_invocation_short_name));

189

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

190

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

190

191

}

191

192

193

/*

207

208

}

208

209

210

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

210

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

211

int af){

211

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

212

int af, server **current_server){

212

213

int ret;

213

214

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

214

215

if(new_server == NULL){

224

225

return false;

225

226

}

226

227

/* Special case of first server */

227

if (mc.current_server == NULL){

228

if(*current_server == NULL){

228

229

new_server->next = new_server;

229

230

new_server->prev = new_server;

230

mc.current_server = new_server;

231

*current_server = new_server;

231

232

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

232

233

} else {

233

new_server->next = mc.current_server;

234

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

234

new_server->next = *current_server;

235

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

235

236

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

237

238

}

238

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

239

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

239

240

if(ret == -1){

240

241

perror_plus("clock_gettime");

241

242

return false;

247

248

* Initialize GPGME.

248

249

*/

249

250

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

250

const char *tempdir){

251

const char *tempdir, mandos_context *mc){

251

252

gpgme_error_t rc;

252

253

gpgme_engine_info_t engine_info;

253

254

255

/*

256

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

257

*/

273

return false;

274

}

275

276

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

277

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

323

}

324

325

/* Create new GPGME "context" */

326

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

326

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

327

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

344

*/

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

size_t crypto_size,

347

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

348

349

gpgme_data_t dh_crypto, dh_plain;

349

350

gpgme_error_t rc;

350

351

ssize_t ret;

376

377

378

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

378

379

data buffer */

379

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

380

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

380

381

if(rc != GPG_ERR_NO_ERROR){

381

382

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

382

383

gpgme_strsource(rc), gpgme_strerror(rc));

383

384

plaintext_length = -1;

384

385

if(debug){

385

386

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

387

388

if(result == NULL){

388

389

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

389

390

} else {

467

468

}

468

469

470

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

481

}

482

483

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

485

486

int ret;

486

487

488

if(debug){

504

505

}

505

506

507

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

509

if(ret != GNUTLS_E_SUCCESS){

509

510

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

510

511

safer_gnutls_strerror(ret));

520

521

}

521

522

523

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

524

525

GNUTLS_OPENPGP_FMT_BASE64);

525

526

if(ret != GNUTLS_E_SUCCESS){

526

527

fprintf_plus(stderr,

532

533

}

533

534

535

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

536

537

if(ret != GNUTLS_E_SUCCESS){

537

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

539

" initialization: %s\n",

539

540

safer_gnutls_strerror(ret));

540

541

goto globalfail;

541

542

}

542

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

543

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

543

544

if(ret != GNUTLS_E_SUCCESS){

544

545

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

545

546

safer_gnutls_strerror(ret));

546

547

goto globalfail;

547

548

}

548

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

550

551

552

return 0;

552

553

554

globalfail:

554

555

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

556

557

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

558

559

return -1;

559

560

}

560

561

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

562

564

int ret;

563

565

/* GnuTLS session creation */

564

566

do {

576

578

{

577

579

const char *err;

578

580

do {

579

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

581

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

580

582

if(quit_now){

581

583

gnutls_deinit(*session);

582

584

return -1;

593

595

594

596

do {

595

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

598

mc->cred);

597

599

if(quit_now){

598

600

gnutls_deinit(*session);

599

601

return -1;

609

611

/* ignore client certificate if any. */

610

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

613

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

615

614

616

return 0;

615

617

}

619

621

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

620

622

621

623

/* Called when a Mandos server is found */

622

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

624

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

623

625

AvahiIfIndex if_index,

624

int af){

626

int af, mandos_context *mc){

625

627

int ret, tcp_sd = -1;

626

628

ssize_t sret;

627

629

union {

657

659

return -1;

658

660

}

659

661

660

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

661

695

if(ret != 0){

662

696

return -1;

663

697

}

664

698

665

699

if(debug){

666

700

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

667

PRIu16 "\n", ip, port);

701

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

668

702

}

669

703

670

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

701

735

goto mandos_end;

702

736

}

703

737

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

738

to.in6.sin6_port = htons(port);

708

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

740

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

710

741

-Wunreachable-code*/

734

765

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

735

766

perror_plus("if_indextoname");

736

767

} else {

737

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

738

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

768

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

769

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

739

770

}

740

771

} else {

741

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

742

ip, port);

772

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

773

ip, (uintmax_t)port);

743

774

}

744

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

938

969

if(buffer_length > 0){

939

970

ssize_t decrypted_buffer_size;

940

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

972

&decrypted_buffer, mc);

942

973

if(decrypted_buffer_size >= 0){

943

974

944

975

written = 0;

1005

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1038

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1010

1043

1011

1044

/* Called whenever a service has been resolved successfully or

1012

1045

timed out */

1021

1054

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

1022

1055

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

1023

1056

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1057

avahi_strerror(avahi_server_errno

1058

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

1025

1059

break;

1026

1060

1027

1061

case AVAHI_RESOLVER_FOUND:

1033

1067

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

1034

1068

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

1035

1069

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1038

1074

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1075

avahi_simple_poll_quit(simple_poll);

1040

1076

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1043

1080

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

1044

1081

" list\n", name);

1045

1082

}

1058

1095

const char *domain,

1059

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1097

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1063

1102

1064

1103

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

1065

1104

is removed from the LAN */

1073

1112

case AVAHI_BROWSER_FAILURE:

1074

1113

1075

1114

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1078

1118

return;

1079

1119

1080

1120

case AVAHI_BROWSER_NEW:

1083

1123

the callback function is called the Avahi server will free the

1084

1124

resolver for us. */

1085

1125

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1089

1130

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

1090

1131

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1132

avahi_strerror(avahi_server_errno

1133

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

1092

1134

break;

1093

1135

1094

1136

case AVAHI_BROWSER_REMOVE:

1113

1155

signal_received = sig;

1114

1156

int old_errno = errno;

1115

1157

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1118

1160

}

1119

1161

errno = old_errno;

1120

1162

}

1121

1163

1122

1164

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

1123

1165

int ret;

1166

error_t ret_errno;

1124

1167

1125

1168

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

1126

1169

if(s < 0){

1170

ret_errno = errno;

1127

1171

perror_plus("socket");

1172

errno = ret_errno;

1128

1173

return false;

1129

1174

}

1130

1175

strcpy(ifr->ifr_name, ifname);

1131

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1177

if(ret == -1){

1133

1178

if(debug){

1179

ret_errno = errno;

1134

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1135

1182

}

1136

1183

return false;

1137

1184

}

1206

1253

}

1207

1254

1208

1255

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1249

1285

}

1250

1286

1251

1287

int notdotentries(const struct dirent *direntry){

1320

1356

return 1;

1321

1357

}

1322

1358

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1324

1361

int ret;

1325

1362

struct timespec now;

1326

1363

struct timespec waited_time;

1327

1364

intmax_t block_time;

1328

1365

1329

1366

while(true){

1330

if(mc.current_server == NULL){

1367

if(mc->current_server == NULL){

1331

1368

if (debug){

1332

1369

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

1333

1370

" No timeout!\n");

1347

1384

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

1348

1385

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

1349

1386

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1387

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

1351

1388

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1389

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

1353

1390

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

1354

1391

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

1355

1392

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

1363

1400

}

1364

1401

1365

1402

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1370

1407

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1408

avahi_simple_poll_quit(s);

1372

1409

return 0;

1373

1410

}

1374

1411

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1412

&mc->current_server->last_seen);

1376

1413

if(ret == -1){

1377

1414

perror_plus("clock_gettime");

1378

1415

return -1;

1379

1416

}

1380

mc.current_server = mc.current_server->next;

1417

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

1381

1418

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

1382

1419

servers, but don't block */

1383

1420

}

1432

1469

return ret_errno;

1433

1470

}

1434

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1435

1484

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

1436

1485

const float delay){

1437

1486

struct dirent **direntries;

1440

1489

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

1441

1490

alphasort);

1442

1491

if(numhooks == -1){

1443

perror_plus("scandir");

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1444

1500

} else {

1445

1501

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

1446

1502

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

1558

1614

return true;

1559

1615

}

1560

1616

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1563

1619

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1566

int ret;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1567

1623

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1624

unsigned int if_index = if_nametoindex(interface);

1569

1625

if(if_index == 0){

1570

1626

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

1571

1627

errno = old_errno;

1577

1633

return EINTR;

1578

1634

}

1579

1635

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1630

1643

network.ifr_flags |= IFF_UP;

1631

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

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1632

1693

if(ret == -1){

1633

ret_errno = errno;

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1634

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

1700

errno = old_errno;

1646

1701

return ret_errno;

1647

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1648

1706

}

1707

1649

1708

/* Sleep checking until interface is running.

1650

1709

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

1651

1710

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1711

if(interface_is_running(interface)){

1656

1712

break;

1657

1713

}

1658

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

1717

perror_plus("nanosleep");

1662

1718

}

1663

1719

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1668

1736

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1673

1770

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1676

1783

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1784

1680

1785

errno = old_errno;

1681

1786

return 0;

1682

1787

}

1683

1788

1684

1789

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1685

1794

AvahiSServiceBrowser *sb = NULL;

1686

int error;

1795

error_t ret_errno;

1687

1796

int ret;

1688

1797

intmax_t tmpmax;

1689

1798

char *tmp;

1690

1799

int exitcode = EXIT_SUCCESS;

1691

const char *interface = "";

1692

struct ifreq network;

1693

int sd = -1;

1694

bool take_down_interface = false;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1695

1802

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

1696

1803

bool tempdir_created = false;

1697

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1698

1805

const char *seckey = PATHDIR "/" SECKEY;

1699

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1700

1809

1701

1810

bool gnutls_initialized = false;

1702

1811

bool gpgme_initialized = false;

1793

1902

connect_to = arg;

1794

1903

break;

1795

1904

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

1796

interface = arg;

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1797

1910

break;

1798

1911

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

1799

1912

seckey = arg;

1923

2036

}

1924

2037

1925

2038

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

1930

2056

}

1931

2057

}

1932

2058

}

1933

2059

1934

2060

/* Run network hooks */

1935

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

1936

goto end;

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

1937

2077

}

1938

2078

1939

2079

if(not debug){

1940

2080

avahi_set_log_function(empty_log);

1941

2081

}

1942

2082

1943

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

1944

struct dirent **direntries;

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1954

if(ret >= 1){

1955

/* Pick the first interface returned */

1956

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

1957

if(debug){

1958

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

1959

}

1960

if(interface == NULL){

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

1964

goto end;

1965

}

1966

free(direntries);

1967

} else {

1968

free(direntries);

1969

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

1970

exitcode = EXIT_FAILURE;

1971

goto end;

1972

}

1973

}

1974

1975

2083

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

1976

2084

from the signal handler */

1977

2085

/* Initialize the pseudo-RNG for Avahi */

1978

2086

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

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1981

2089

fprintf_plus(stderr,

1982

2090

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

1983

2091

exitcode = EX_UNAVAILABLE;

2047

2155

}

2048

2156

}

2049

2157

2050

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

2051

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

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

2056

}

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

2204

}

2205

}

2206

break;

2207

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

2057

2233

}

2058

2234

2059

2235

if(quit_now){

2060

2236

goto end;

2061

2237

}

2062

2238

2063

ret = init_gnutls_global(pubkey, seckey);

2239

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

2064

2240

if(ret == -1){

2065

2241

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

2066

2242

exitcode = EX_UNAVAILABLE;

2083

2259

goto end;

2084

2260

}

2085

2261

2086

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

2262

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

2087

2263

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

2088

2264

exitcode = EX_UNAVAILABLE;

2089

2265

goto end;

2110

2286

goto end;

2111

2287

}

2112

2288

2113

uint16_t port;

2289

in_port_t port;

2114

2290

errno = 0;

2115

2291

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

2116

2292

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

2117

or tmpmax != (uint16_t)tmpmax){

2293

or tmpmax != (in_port_t)tmpmax){

2118

2294

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

2119

2295

exitcode = EX_USAGE;

2120

2296

goto end;

2121

2297

}

2122

2298

2123

2299

if(quit_now){

2124

2300

goto end;

2125

2301

}

2126

2302

2127

port = (uint16_t)tmpmax;

2303

port = (in_port_t)tmpmax;

2128

2304

*address = '\0';

2129

2305

/* Colon in address indicates IPv6 */

2130

2306

int af;

2146

2322

}

2147

2323

2148

2324

while(not quit_now){

2149

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

2325

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

2326

&mc);

2150

2327

if(quit_now or ret == 0){

2151

2328

break;

2152

2329

}

2154

2331

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

2155

2332

(int)retry_interval);

2156

2333

}

2157

sleep((int)retry_interval);

2334

sleep((unsigned int)retry_interval);

2158

2335

}

2159

2336

2160

2337

if (not quit_now){

2178

2355

config.publish_domain = 0;

2179

2356

2180

2357

/* Allocate a new server */

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2184

2360

2185

2361

/* Free the Avahi configuration data */

2186

2362

avahi_server_config_free(&config);

2189

2365

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

2190

2366

if(mc.server == NULL){

2191

2367

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

2192

avahi_strerror(error));

2368

avahi_strerror(ret_errno));

2193

2369

exitcode = EX_UNAVAILABLE;

2194

2370

goto end;

2195

2371

}

2201

2377

/* Create the Avahi service browser */

2202

2378

sb = avahi_s_service_browser_new(mc.server, if_index,

2203

2379

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2204

NULL, 0, browse_callback, NULL);

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2205

2382

if(sb == NULL){

2206

2383

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

2207

2384

avahi_strerror(avahi_server_errno(mc.server)));

2219

2396

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

2220

2397

}

2221

2398

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2224

2401

if(debug){

2225

2402

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

2226

2403

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

2233

2410

}

2234

2411

2235

2412

/* Cleanup things */

2413

free(mc.interfaces);

2414

2236

2415

if(sb != NULL)

2237

2416

avahi_s_service_browser_free(sb);

2238

2417

2239

2418

if(mc.server != NULL)

2240

2419

avahi_server_free(mc.server);

2241

2420

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2244

2423

2245

2424

if(gnutls_initialized){

2246

2425

gnutls_certificate_free_credentials(mc.cred);

2263

2442

}

2264

2443

}

2265

2444

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

2445

/* Re-raise priviliges */

2270

2446

{

2271

2447

raise_privileges();

2272

2448

2273

/* Take down the network interface */

2274

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

2275

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

2276

if(ret == -1){

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

2280

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

2281

if(ret == -1){

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2283

2463

}

2284

2464

}

2285

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

2286

if(ret == -1){

2287

perror_plus("close");

2465

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

2466

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

2467

" down\n");

2288

2468

}

2289

2469

}

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2297

2476

2298

2477

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

2299

2478

if(tempdir_created){