/mandos/release : revision 237.15.4

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@fukt.bsnet.se>.

29

* Contact the authors at <mandos@recompile.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

69

SIOCSIFFLAGS, if_indextoname(),

73

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

75

getuid(), getgid(), seteuid(),

75

76

setgid(), pause() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

122

123

#define PATHDIR "/conf/conf.d/mandos"

123

124

#define SECKEY "seckey.txt"

124

125

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

125

127

126

128

bool debug = false;

127

129

static const char mandos_protocol_version[] = "1";

128

130

const char *argp_program_version = "mandos-client " VERSION;

129

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

131

const char *argp_program_bug_address = "<mandos@recompile.se>";

130

132

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

131

133

char *connect_to = NULL;

132

134

135

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

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

145

133

146

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

134

147

typedef struct {

135

148

AvahiSimplePoll *simple_poll;

139

152

gnutls_dh_params_t dh_params;

140

153

const char *priority;

141

154

gpgme_ctx_t ctx;

155

server *current_server;

142

156

} mandos_context;

143

157

144

158

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

145

159

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

146

160

.dh_bits = 1024, .priority = "SECURE256"

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

161

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

162

.current_server = NULL };

148

163

149

164

sig_atomic_t quit_now = 0;

150

165

int signal_received = 0;

151

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

fprintf(stderr, "Mandos plugin %s: ",

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

174

int fprintf_plus(FILE *stream, const char *format, ...){

175

va_list ap;

176

va_start (ap, format);

177

178

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

179

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

180

}

181

152

182

/*

153

183

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

184

* bytes. "buffer_capacity" is how much is currently allocated,

166

196

return buffer_capacity;

167

197

}

168

198

199

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

203

int ret;

204

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

205

if(new_server == NULL){

206

perror_plus("malloc");

207

return -1;

208

}

209

*new_server = (server){ .ip = strdup(ip),

210

.port = port,

211

.if_index = if_index,

212

.af = af };

213

if(new_server->ip == NULL){

214

perror_plus("strdup");

215

return -1;

216

}

217

/* Special case of first server */

218

if (mc.current_server == NULL){

219

new_server->next = new_server;

220

new_server->prev = new_server;

221

mc.current_server = new_server;

222

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

223

} else {

224

new_server->next = mc.current_server;

225

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

226

new_server->prev->next = new_server;

227

mc.current_server->prev = new_server;

228

}

229

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

230

if(ret == -1){

231

perror_plus("clock_gettime");

232

return -1;

233

}

234

return 0;

235

}

236

169

237

/*

170

238

* Initialize GPGME.

171

239

*/

185

253

186

254

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

187

255

if(fd == -1){

188

perror("open");

256

perror_plus("open");

189

257

return false;

190

258

}

191

259

205

273

206

274

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

207

275

if(ret == -1){

208

perror("close");

276

perror_plus("close");

209

277

}

210

278

gpgme_data_release(pgp_data);

211

279

return true;

224

292

return false;

225

293

}

226

294

227

/* Set GPGME home directory for the OpenPGP engine only */

295

/* Set GPGME home directory for the OpenPGP engine only */

228

296

rc = gpgme_get_engine_info(&engine_info);

229

297

if(rc != GPG_ERR_NO_ERROR){

230

298

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

336

404

337

405

/* Seek back to the beginning of the GPGME plaintext data buffer */

338

406

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

407

perror_plus("gpgme_data_seek");

340

408

plaintext_length = -1;

341

409

goto decrypt_end;

342

410

}

347

415

(size_t)plaintext_length,

348

416

plaintext_capacity);

349

417

if(plaintext_capacity == 0){

350

perror("incbuffer");

418

perror_plus("incbuffer");

351

419

plaintext_length = -1;

352

420

goto decrypt_end;

353

421

}

360

428

break;

361

429

}

362

430

if(ret < 0){

363

perror("gpgme_data_read");

431

perror_plus("gpgme_data_read");

364

432

plaintext_length = -1;

365

433

goto decrypt_end;

366

434

}

423

491

}

424

492

425

493

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

495

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

496

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

432

497

safer_gnutls_strerror(ret));

433

498

gnutls_global_deinit();

434

499

return -1;

589

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

655

if(tcp_sd < 0){

591

656

int e = errno;

592

perror("socket");

657

perror_plus("socket");

593

658

errno = e;

594

659

goto mandos_end;

595

660

}

609

674

}

610

675

if(ret < 0 ){

611

676

int e = errno;

612

perror("inet_pton");

677

perror_plus("inet_pton");

613

678

errno = e;

614

679

goto mandos_end;

615

680

}

651

716

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

717

char interface[IF_NAMESIZE];

653

718

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

654

perror("if_indextoname");

719

perror_plus("if_indextoname");

655

720

} else {

656

721

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

657

722

ip, interface, port);

671

736

sizeof(addrstr));

672

737

}

673

738

if(pcret == NULL){

674

perror("inet_ntop");

739

perror_plus("inet_ntop");

675

740

} else {

676

741

if(strcmp(addrstr, ip) != 0){

677

742

fprintf(stderr, "Canonical address form: %s\n", addrstr);

692

757

if(ret < 0){

693

758

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

759

int e = errno;

695

perror("connect");

760

perror_plus("connect");

696

761

errno = e;

697

762

}

698

763

goto mandos_end;

711

776

out_size - written));

712

777

if(ret == -1){

713

778

int e = errno;

714

perror("write");

779

perror_plus("write");

715

780

errno = e;

716

781

goto mandos_end;

717

782

}

742

807

goto mandos_end;

743

808

}

744

809

810

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

745

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

812

747

813

if(quit_now){

784

850

buffer_capacity);

785

851

if(buffer_capacity == 0){

786

852

int e = errno;

787

perror("incbuffer");

853

perror_plus("incbuffer");

788

854

errno = e;

789

855

goto mandos_end;

790

856

}

895

961

if(e == 0){

896

962

e = errno;

897

963

}

898

perror("close");

964

perror_plus("close");

899

965

}

900

966

gnutls_deinit(session);

967

errno = e;

901

968

if(quit_now){

902

e = EINTR;

969

errno = EINTR;

903

970

retval = -1;

904

971

}

905

errno = e;

906

972

}

907

973

return retval;

908

974

}

951

1017

avahi_proto_to_af(proto));

952

1018

if(ret == 0){

953

1019

avahi_simple_poll_quit(mc.simple_poll);

1020

} else {

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

954

1023

}

955

1024

}

956

1025

}

1010

1079

}

1011

1080

}

1012

1081

1013

/* stop main loop after sigterm has been called */

1082

/* Signal handler that stops main loop after SIGTERM */

1014

1083

static void handle_sigterm(int sig){

1015

1084

if(quit_now){

1016

1085

return;

1018

1087

quit_now = 1;

1019

1088

signal_received = sig;

1020

1089

int old_errno = errno;

1090

/* set main loop to exit */

1021

1091

if(mc.simple_poll != NULL){

1022

1092

avahi_simple_poll_quit(mc.simple_poll);

1023

1093

}

1024

1094

errno = old_errno;

1025

1095

}

1026

1096

1097

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

1098

int ret;

1099

1100

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

1101

if(s < 0){

1102

perror_plus("socket");

1103

return false;

1104

}

1105

strcpy(ifr->ifr_name, ifname);

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1107

if(ret == -1){

1108

if(debug){

1109

perror_plus("ioctl SIOCGIFFLAGS");

1110

}

1111

return false;

1112

}

1113

return true;

1114

}

1115

1116

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

1117

1118

/* Reject the loopback device */

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

if(debug){

1121

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1122

ifname);

1123

}

1124

return false;

1125

}

1126

/* Accept point-to-point devices only if connect_to is specified */

1127

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1128

if(debug){

1129

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1130

ifname);

1131

}

1132

return true;

1133

}

1134

/* Otherwise, reject non-broadcast-capable devices */

1135

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1136

if(debug){

1137

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1138

ifname);

1139

}

1140

return false;

1141

}

1142

/* Reject non-ARP interfaces (including dummy interfaces) */

1143

if(ifr->ifr_flags & IFF_NOARP){

1144

if(debug){

1145

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1146

}

1147

return false;

1148

}

1149

1150

/* Accept this device */

1151

if(debug){

1152

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1153

}

1154

return true;

1155

}

1156

1027

1157

/*

1028

1158

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

1029

1159

* corresponds to an acceptable network device.

1030

1160

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

1031

1161

*/

1032

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

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

1165

return 0;

1166

}

1167

struct ifreq ifr;

1168

1169

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

1170

return 0;

1171

}

1172

1173

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

1174

return 0;

1175

}

1176

return 1;

1177

}

1178

1179

/*

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1183

*/

1184

int up_interface(const struct dirent *if_entry){

1033

1185

ssize_t ssret;

1034

1186

char *flagname = NULL;

1035

1187

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

1038

1190

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1039

1191

if_entry->d_name);

1040

1192

if(ret < 0){

1041

perror("asprintf");

1193

perror_plus("asprintf");

1042

1194

return 0;

1043

1195

}

1044

1196

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

1197

if(flags_fd == -1){

1046

perror("open");

1198

perror_plus("open");

1047

1199

free(flagname);

1048

1200

return 0;

1049

1201

}

1050

1202

free(flagname);

1051

1203

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1052

1204

/* read line from flags_fd */

1053

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1205

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1054

1206

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1055

1207

flagstring[(size_t)to_read] = '\0';

1056

1208

if(flagstring == NULL){

1057

perror("malloc");

1209

perror_plus("malloc");

1058

1210

close(flags_fd);

1059

1211

return 0;

1060

1212

}

1062

1214

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1063

1215

(size_t)to_read));

1064

1216

if(ssret == -1){

1065

perror("read");

1217

perror_plus("read");

1066

1218

free(flagstring);

1067

1219

close(flags_fd);

1068

1220

return 0;

1097

1249

}

1098

1250

return 0;

1099

1251

}

1252

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1100

1258

/* Accept point-to-point devices only if connect_to is specified */

1101

1259

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1102

1260

if(debug){

1129

1287

return 1;

1130

1288

}

1131

1289

1290

int notdotentries(const struct dirent *direntry){

1291

/* Skip "." and ".." */

1292

if(direntry->d_name[0] == '.'

1293

and (direntry->d_name[1] == '\0'

1294

or (direntry->d_name[1] == '.'

1295

and direntry->d_name[2] == '\0'))){

1296

return 0;

1297

}

1298

return 1;

1299

}

1300

1301

/* Is this directory entry a runnable program? */

1302

int runnable_hook(const struct dirent *direntry){

1303

int ret;

1304

struct stat st;

1305

1306

if((direntry->d_name)[0] == '\0'){

1307

/* Empty name? */

1308

return 0;

1309

}

1310

1311

/* Save pointer to last character */

1312

char *end = strchr(direntry->d_name, '\0')-1;

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

if(((direntry->d_name)[0] == '#')

1320

and (*end == '#')){

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

ret = stat(direntry->d_name, &st);

1328

if(ret == -1){

1329

if(debug){

1330

perror_plus("Could not stat plugin");

1331

}

1332

return 0;

1333

}

1334

if(not (st.st_mode & S_ISREG)){

1335

/* Not a regular file */

1336

return 0;

1337

}

1338

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1339

/* Not executable */

1340

return 0;

1341

}

1342

return 1;

1343

}

1344

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1346

int ret;

1347

struct timespec now;

1348

struct timespec waited_time;

1349

intmax_t block_time;

1350

1351

while(true){

1352

if(mc.current_server == NULL){

1353

if (debug){

1354

fprintf(stderr,

1355

"Wait until first server is found. No timeout!\n");

1356

}

1357

ret = avahi_simple_poll_iterate(s, -1);

1358

} else {

1359

if (debug){

1360

fprintf(stderr, "Check current_server if we should run it,"

1361

" or wait\n");

1362

}

1363

/* the current time */

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

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

1370

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

1371

waited_time.tv_sec = (now.tv_sec

1372

- mc.current_server->last_seen.tv_sec);

1373

waited_time.tv_nsec = (now.tv_nsec

1374

- mc.current_server->last_seen.tv_nsec);

1375

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

1376

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

1377

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

1378

block_time = ((retry_interval

1379

- ((intmax_t)waited_time.tv_sec * 1000))

1380

- ((intmax_t)waited_time.tv_nsec / 1000000));

1381

1382

if (debug){

1383

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1384

}

1385

1386

if(block_time <= 0){

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1391

if(ret == 0){

1392

avahi_simple_poll_quit(mc.simple_poll);

1393

return 0;

1394

}

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1396

&mc.current_server->last_seen);

1397

if(ret == -1){

1398

perror_plus("clock_gettime");

1399

return -1;

1400

}

1401

mc.current_server = mc.current_server->next;

1402

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

1403

servers, but don't block */

1404

}

1405

1406

ret = avahi_simple_poll_iterate(s, (int)block_time);

1407

}

1408

if(ret != 0){

1409

if (ret > 0 or errno != EINTR) {

1410

return (ret != 1) ? ret : 0;

1411

}

1412

}

1413

}

1414

}

1415

1132

1416

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

1133

1417

AvahiSServiceBrowser *sb = NULL;

1134

1418

int error;

1151

1435

bool gnutls_initialized = false;

1152

1436

bool gpgme_initialized = false;

1153

1437

float delay = 2.5f;

1438

double retry_interval = 10; /* 10s between trying a server and

1439

retrying the same server again */

1154

1440

1155

1441

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1156

1442

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1162

1448

errno = 0;

1163

1449

ret = setgid(gid);

1164

1450

if(ret == -1){

1165

perror("setgid");

1451

perror_plus("setgid");

1166

1452

}

1167

1453

1168

1454

/* Lower user privileges (temporarily) */

1169

1455

errno = 0;

1170

1456

ret = seteuid(uid);

1171

1457

if(ret == -1){

1172

perror("seteuid");

1458

perror_plus("seteuid");

1173

1459

}

1174

1460

1175

1461

if(quit_now){

1210

1496

.arg = "SECONDS",

1211

1497

.doc = "Maximum delay to wait for interface startup",

1212

1498

.group = 2 },

1499

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

1500

.arg = "SECONDS",

1501

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

1502

.group = 2 },

1213

1503

/*

1214

1504

* These reproduce what we would get without ARGP_NO_HELP

1215

1505

*/

1259

1549

if(errno != 0 or tmp == arg or *tmp != '\0'){

1260

1550

argp_error(state, "Bad delay");

1261

1551

}

1552

case 132: /* --retry */

1553

errno = 0;

1554

retry_interval = strtod(arg, &tmp);

1555

if(errno != 0 or tmp == arg or *tmp != '\0'

1556

or (retry_interval * 1000) > INT_MAX

1557

or retry_interval < 0){

1558

argp_error(state, "Bad retry interval");

1559

}

1262

1560

break;

1263

1561

/*

1264

1562

* These reproduce what we would get without ARGP_NO_HELP

1292

1590

case ENOMEM:

1293

1591

default:

1294

1592

errno = ret;

1295

perror("argp_parse");

1593

perror_plus("argp_parse");

1296

1594

exitcode = EX_OSERR;

1297

1595

goto end;

1298

1596

case EINVAL:

1300

1598

goto end;

1301

1599

}

1302

1600

}

1601

1602

{

1603

/* Work around Debian bug #633582:

1604

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

1605

struct stat st;

1606

1607

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

ret = asprintf(&fullname, "%s/%s", tempdir,

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

setenv("MODE", "start", 1);

1687

/* setenv( XXX more here */

1688

ret = execl(fullname, direntry->d_name, "start");

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1693

goto end;

1694

}

1695

}

1696

close(devnull);

1697

}

1303

1698

1304

1699

if(not debug){

1305

1700

avahi_set_log_function(empty_log);

1306

1701

}

1307

1702

1308

1703

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

1309

1704

struct dirent **direntries;

1310

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1316

1711

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

1317

1712

}

1318

1713

if(interface == NULL){

1319

perror("malloc");

1714

perror_plus("malloc");

1320

1715

free(direntries);

1321

1716

exitcode = EXIT_FAILURE;

1322

1717

goto end;

1344

1739

sigemptyset(&sigterm_action.sa_mask);

1345

1740

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1346

1741

if(ret == -1){

1347

perror("sigaddset");

1742

perror_plus("sigaddset");

1348

1743

exitcode = EX_OSERR;

1349

1744

goto end;

1350

1745

}

1351

1746

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1352

1747

if(ret == -1){

1353

perror("sigaddset");

1748

perror_plus("sigaddset");

1354

1749

exitcode = EX_OSERR;

1355

1750

goto end;

1356

1751

}

1357

1752

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1358

1753

if(ret == -1){

1359

perror("sigaddset");

1754

perror_plus("sigaddset");

1360

1755

exitcode = EX_OSERR;

1361

1756

goto end;

1362

1757

}

1366

1761

*/

1367

1762

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1368

1763

if(ret == -1){

1369

perror("sigaction");

1764

perror_plus("sigaction");

1370

1765

return EX_OSERR;

1371

1766

}

1372

1767

if(old_sigterm_action.sa_handler != SIG_IGN){

1373

1768

ret = sigaction(SIGINT, &sigterm_action, NULL);

1374

1769

if(ret == -1){

1375

perror("sigaction");

1770

perror_plus("sigaction");

1376

1771

exitcode = EX_OSERR;

1377

1772

goto end;

1378

1773

}

1379

1774

}

1380

1775

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1381

1776

if(ret == -1){

1382

perror("sigaction");

1777

perror_plus("sigaction");

1383

1778

return EX_OSERR;

1384

1779

}

1385

1780

if(old_sigterm_action.sa_handler != SIG_IGN){

1386

1781

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1387

1782

if(ret == -1){

1388

perror("sigaction");

1783

perror_plus("sigaction");

1389

1784

exitcode = EX_OSERR;

1390

1785

goto end;

1391

1786

}

1392

1787

}

1393

1788

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1394

1789

if(ret == -1){

1395

perror("sigaction");

1790

perror_plus("sigaction");

1396

1791

return EX_OSERR;

1397

1792

}

1398

1793

if(old_sigterm_action.sa_handler != SIG_IGN){

1399

1794

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1400

1795

if(ret == -1){

1401

perror("sigaction");

1796

perror_plus("sigaction");

1402

1797

exitcode = EX_OSERR;

1403

1798

goto end;

1404

1799

}

1421

1816

errno = 0;

1422

1817

ret = seteuid(0);

1423

1818

if(ret == -1){

1424

perror("seteuid");

1819

perror_plus("seteuid");

1425

1820

}

1426

1821

1427

1822

#ifdef __linux__

1431

1826

bool restore_loglevel = true;

1432

1827

if(ret == -1){

1433

1828

restore_loglevel = false;

1434

perror("klogctl");

1829

perror_plus("klogctl");

1435

1830

}

1436

1831

#endif /* __linux__ */

1437

1832

1438

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1439

1834

if(sd < 0){

1440

perror("socket");

1835

perror_plus("socket");

1441

1836

exitcode = EX_OSERR;

1442

1837

#ifdef __linux__

1443

1838

if(restore_loglevel){

1444

1839

ret = klogctl(7, NULL, 0);

1445

1840

if(ret == -1){

1446

perror("klogctl");

1841

perror_plus("klogctl");

1447

1842

}

1448

1843

}

1449

1844

#endif /* __linux__ */

1451

1846

errno = 0;

1452

1847

ret = seteuid(uid);

1453

1848

if(ret == -1){

1454

perror("seteuid");

1849

perror_plus("seteuid");

1455

1850

}

1456

1851

goto end;

1457

1852

}

1458

1853

strcpy(network.ifr_name, interface);

1459

1854

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

1460

1855

if(ret == -1){

1461

perror("ioctl SIOCGIFFLAGS");

1856

perror_plus("ioctl SIOCGIFFLAGS");

1462

1857

#ifdef __linux__

1463

1858

if(restore_loglevel){

1464

1859

ret = klogctl(7, NULL, 0);

1465

1860

if(ret == -1){

1466

perror("klogctl");

1861

perror_plus("klogctl");

1467

1862

}

1468

1863

}

1469

1864

#endif /* __linux__ */

1472

1867

errno = 0;

1473

1868

ret = seteuid(uid);

1474

1869

if(ret == -1){

1475

perror("seteuid");

1870

perror_plus("seteuid");

1476

1871

}

1477

1872

goto end;

1478

1873

}

1482

1877

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

1483

1878

if(ret == -1){

1484

1879

take_down_interface = false;

1485

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1486

1881

exitcode = EX_OSERR;

1487

1882

#ifdef __linux__

1488

1883

if(restore_loglevel){

1489

1884

ret = klogctl(7, NULL, 0);

1490

1885

if(ret == -1){

1491

perror("klogctl");

1886

perror_plus("klogctl");

1492

1887

}

1493

1888

}

1494

1889

#endif /* __linux__ */

1496

1891

errno = 0;

1497

1892

ret = seteuid(uid);

1498

1893

if(ret == -1){

1499

perror("seteuid");

1894

perror_plus("seteuid");

1500

1895

}

1501

1896

goto end;

1502

1897

}

1503

1898

}

1504

/* sleep checking until interface is running */

1899

/* Sleep checking until interface is running.

1900

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

1505

1901

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

1506

1902

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

1507

1903

if(ret == -1){

1508

perror("ioctl SIOCGIFFLAGS");

1904

perror_plus("ioctl SIOCGIFFLAGS");

1509

1905

} else if(network.ifr_flags & IFF_RUNNING){

1510

1906

break;

1511

1907

}

1512

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1513

1909

ret = nanosleep(&sleeptime, NULL);

1514

1910

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

1515

perror("nanosleep");

1911

perror_plus("nanosleep");

1516

1912

}

1517

1913

}

1518

1914

if(not take_down_interface){

1519

1915

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

1520

1916

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

1521

1917

if(ret == -1){

1522

perror("close");

1918

perror_plus("close");

1523

1919

}

1524

1920

}

1525

1921

#ifdef __linux__

1527

1923

/* Restores kernel loglevel to default */

1528

1924

ret = klogctl(7, NULL, 0);

1529

1925

if(ret == -1){

1530

perror("klogctl");

1926

perror_plus("klogctl");

1531

1927

}

1532

1928

}

1533

1929

#endif /* __linux__ */

1537

1933

/* Lower privileges */

1538

1934

ret = seteuid(uid);

1539

1935

if(ret == -1){

1540

perror("seteuid");

1936

perror_plus("seteuid");

1541

1937

}

1542

1938

} else {

1543

1939

/* Lower privileges permanently */

1544

1940

ret = setuid(uid);

1545

1941

if(ret == -1){

1546

perror("setuid");

1942

perror_plus("setuid");

1547

1943

}

1548

1944

}

1549

1945

}

1565

1961

goto end;

1566

1962

}

1567

1963

1964

if(mkdtemp(tempdir) == NULL){

1965

perror_plus("mkdtemp");

1966

goto end;

1967

}

1568

1968

tempdir_created = true;

1569

if(mkdtemp(tempdir) == NULL){

1570

tempdir_created = false;

1571

perror("mkdtemp");

1572

goto end;

1573

}

1574

1969

1575

1970

if(quit_now){

1576

1971

goto end;

1618

2013

1619

2014

port = (uint16_t)tmpmax;

1620

2015

*address = '\0';

1621

address = connect_to;

1622

2016

/* Colon in address indicates IPv6 */

1623

2017

int af;

1624

if(strchr(address, ':') != NULL){

2018

if(strchr(connect_to, ':') != NULL){

1625

2019

af = AF_INET6;

2020

/* Accept [] around IPv6 address - see RFC 5952 */

2021

if(connect_to[0] == '[' and address[-1] == ']')

2022

{

2023

connect_to++;

2024

address[-1] = '\0';

2025

}

1626

2026

} else {

1627

2027

af = AF_INET;

1628

2028

}

2029

address = connect_to;

1629

2030

1630

2031

if(quit_now){

1631

2032

goto end;

1632

2033

}

1633

2034

1634

2035

while(not quit_now){

1635

2036

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

1636

2037

if(quit_now or ret == 0){

1637

2038

break;

1638

2039

}

1639

sleep(15);

1640

};

1641

2040

if(debug){

2041

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

2042

(int)retry_interval);

2043

}

2044

sleep((int)retry_interval);

2045

}

2046

1642

2047

if (not quit_now){

1643

2048

exitcode = EXIT_SUCCESS;

1644

2049

}

1645

2050

1646

2051

goto end;

1647

2052

}

1648

2053

1700

2105

if(debug){

1701

2106

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

1702

2107

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2108

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2111

if(debug){

2112

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

2113

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

2114

}

1705

2115

1706

2116

end:

1707

2117

1728

2138

if(gpgme_initialized){

1729

2139

gpgme_release(mc.ctx);

1730

2140

}

2141

2142

/* Cleans up the circular linked list of Mandos servers the client

2143

has seen */

2144

if(mc.current_server != NULL){

2145

mc.current_server->prev->next = NULL;

2146

while(mc.current_server != NULL){

2147

server *next = mc.current_server->next;

2148

free(mc.current_server);

2149

mc.current_server = next;

2150

}

2151

}

2152

2153

/* XXX run network hooks "stop" here */

1731

2154

1732

2155

/* Take down the network interface */

1733

2156

if(take_down_interface){

1735

2158

errno = 0;

1736

2159

ret = seteuid(0);

1737

2160

if(ret == -1){

1738

perror("seteuid");

2161

perror_plus("seteuid");

1739

2162

}

1740

2163

if(geteuid() == 0){

1741

2164

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

1742

2165

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

2166

perror_plus("ioctl SIOCGIFFLAGS");

1744

2167

} else if(network.ifr_flags & IFF_UP) {

1745

2168

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

1746

2169

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

1747

2170

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

2172

}

1750

2173

}

1751

2174

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

1752

2175

if(ret == -1){

1753

perror("close");

2176

perror_plus("close");

1754

2177

}

1755

2178

/* Lower privileges permanently */

1756

2179

errno = 0;

1757

2180

ret = setuid(uid);

1758

2181

if(ret == -1){

1759

perror("setuid");

2182

perror_plus("setuid");

1760

2183

}

1761

2184

}

1762

2185

}

1763

2186

1764

/* Removes the temp directory used by GPGME */

2187

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

1765

2188

if(tempdir_created){

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

/* Skip "." and ".." */

1780

if(direntry->d_name[0] == '.'

1781

and (direntry->d_name[1] == '\0'

1782

or (direntry->d_name[1] == '.'

1783

and direntry->d_name[2] == '\0'))){

1784

continue;

1785

}

2189

struct dirent **direntries = NULL;

2190

struct dirent *direntry = NULL;

2191

int numentries = scandir(tempdir, &direntries, notdotentries,

2192

alphasort);

2193

if (numentries > 0){

2194

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

2195

direntry = direntries[i];

1786

2196

char *fullname = NULL;

1787

2197

ret = asprintf(&fullname, "%s/%s", tempdir,

1788

2198

direntry->d_name);

1789

2199

if(ret < 0){

1790

perror("asprintf");

2200

perror_plus("asprintf");

1791

2201

continue;

1792

2202

}

1793

2203

ret = remove(fullname);

1797

2207

}

1798

2208

free(fullname);

1799

2209

}

1800

closedir(d);

2210

}

2211

2212

/* need to clean even if 0 because man page doesn't specify */

2213

free(direntries);

2214

if (numentries == -1){

2215

perror_plus("scandir");

1801

2216

}

1802

2217

ret = rmdir(tempdir);

1803

2218

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

1804

perror("rmdir");

2219

perror_plus("rmdir");

1805

2220

}

1806

2221

}

1807

2222

1812

2227

&old_sigterm_action,

1813

2228

NULL));

1814

2229

if(ret == -1){

1815

perror("sigaction");

2230

perror_plus("sigaction");

1816

2231

}

1817

2232

do {

1818

2233

ret = raise(signal_received);

1819

2234

} while(ret != 0 and errno == EINTR);

1820

2235

if(ret != 0){

1821

perror("raise");

2236

perror_plus("raise");

1822

2237

abort();

1823

2238

}

1824

2239

TEMP_FAILURE_RETRY(pause());