/mandos/trunk : revision 505.2.3

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

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 */

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

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>";

132

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

133

char *connect_to = NULL;

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;

130

145

131

146

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

132

147

typedef struct {

137

152

gnutls_dh_params_t dh_params;

138

153

const char *priority;

139

154

gpgme_ctx_t ctx;

155

server *current_server;

140

156

} mandos_context;

141

157

142

158

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

143

159

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

144

160

.dh_bits = 1024, .priority = "SECURE256"

145

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

161

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

162

.current_server = NULL };

146

163

147

164

sig_atomic_t quit_now = 0;

148

165

int signal_received = 0;

149

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

150

174

/*

151

175

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

152

176

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

164

188

return buffer_capacity;

165

189

}

166

190

191

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

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

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

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

215

} else {

216

new_server->next = mc.current_server;

217

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

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

167

229

/*

168

230

* Initialize GPGME.

169

231

*/

183

245

184

246

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

185

247

if(fd == -1){

186

perror("open");

248

perror_plus("open");

187

249

return false;

188

250

}

189

251

203

265

204

266

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

205

267

if(ret == -1){

206

perror("close");

268

perror_plus("close");

207

269

}

208

270

gpgme_data_release(pgp_data);

209

271

return true;

222

284

return false;

223

285

}

224

286

225

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

287

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

226

288

rc = gpgme_get_engine_info(&engine_info);

227

289

if(rc != GPG_ERR_NO_ERROR){

228

290

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

334

396

335

397

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

336

398

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

337

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

338

400

plaintext_length = -1;

339

401

goto decrypt_end;

340

402

}

345

407

(size_t)plaintext_length,

346

408

plaintext_capacity);

347

409

if(plaintext_capacity == 0){

348

perror("incbuffer");

410

perror_plus("incbuffer");

349

411

plaintext_length = -1;

350

412

goto decrypt_end;

351

413

}

358

420

break;

359

421

}

360

422

if(ret < 0){

361

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

362

424

plaintext_length = -1;

363

425

goto decrypt_end;

364

426

}

421

483

}

422

484

423

485

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

487

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

488

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

430

489

safer_gnutls_strerror(ret));

431

490

gnutls_global_deinit();

432

491

return -1;

587

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

647

if(tcp_sd < 0){

589

648

int e = errno;

590

perror("socket");

649

perror_plus("socket");

591

650

errno = e;

592

651

goto mandos_end;

593

652

}

607

666

}

608

667

if(ret < 0 ){

609

668

int e = errno;

610

perror("inet_pton");

669

perror_plus("inet_pton");

611

670

errno = e;

612

671

goto mandos_end;

613

672

}

649

708

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

650

709

char interface[IF_NAMESIZE];

651

710

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

652

perror("if_indextoname");

711

perror_plus("if_indextoname");

653

712

} else {

654

713

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

655

714

ip, interface, port);

669

728

sizeof(addrstr));

670

729

}

671

730

if(pcret == NULL){

672

perror("inet_ntop");

731

perror_plus("inet_ntop");

673

732

} else {

674

733

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

675

734

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

688

747

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

689

748

}

690

749

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

694

755

goto mandos_end;

695

756

}

696

757

707

768

out_size - written));

708

769

if(ret == -1){

709

770

int e = errno;

710

perror("write");

771

perror_plus("write");

711

772

errno = e;

712

773

goto mandos_end;

713

774

}

738

799

goto mandos_end;

739

800

}

740

801

802

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

741

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

804

743

805

if(quit_now){

780

842

buffer_capacity);

781

843

if(buffer_capacity == 0){

782

844

int e = errno;

783

perror("incbuffer");

845

perror_plus("incbuffer");

784

846

errno = e;

785

847

goto mandos_end;

786

848

}

891

953

if(e == 0){

892

954

e = errno;

893

955

}

894

perror("close");

956

perror_plus("close");

895

957

}

896

958

gnutls_deinit(session);

959

errno = e;

897

960

if(quit_now){

898

e = EINTR;

961

errno = EINTR;

899

962

retval = -1;

900

963

}

901

errno = e;

902

964

}

903

965

return retval;

904

966

}

947

1009

avahi_proto_to_af(proto));

948

1010

if(ret == 0){

949

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

950

1015

}

951

1016

}

952

1017

}

1006

1071

}

1007

1072

}

1008

1073

1009

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

1074

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

1010

1075

static void handle_sigterm(int sig){

1011

1076

if(quit_now){

1012

1077

return;

1014

1079

quit_now = 1;

1015

1080

signal_received = sig;

1016

1081

int old_errno = errno;

1082

/* set main loop to exit */

1017

1083

if(mc.simple_poll != NULL){

1018

1084

avahi_simple_poll_quit(mc.simple_poll);

1019

1085

}

1020

1086

errno = old_errno;

1021

1087

}

1022

1088

1089

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

1090

int ret;

1091

1092

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

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

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

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

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

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

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

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

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

1162

return 0;

1163

}

1164

1165

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

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

ssize_t ssret;

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1182

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

1183

if_entry->d_name);

1184

if(ret < 0){

1185

perror_plus("asprintf");

1186

return 0;

1187

}

1188

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

1189

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1192

return 0;

1193

}

1194

free(flagname);

1195

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

1196

/* read line from flags_fd */

1197

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

1198

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

1199

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

1200

if(flagstring == NULL){

1201

perror_plus("malloc");

1202

close(flags_fd);

1203

return 0;

1204

}

1205

while(to_read > 0){

1206

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

1207

(size_t)to_read));

1208

if(ssret == -1){

1209

perror_plus("read");

1210

free(flagstring);

1211

close(flags_fd);

1212

return 0;

1213

}

1214

to_read -= ssret;

1215

if(ssret == 0){

1216

break;

1217

}

1218

}

1219

close(flags_fd);

1220

intmax_t tmpmax;

1221

char *tmp;

1222

errno = 0;

1223

tmpmax = strtoimax(flagstring, &tmp, 0);

1224

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

1225

and not (isspace(*tmp)))

1226

or tmpmax != (ifreq_flags)tmpmax){

1227

if(debug){

1228

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1229

flagstring, if_entry->d_name);

1230

}

1231

free(flagstring);

1232

return 0;

1233

}

1234

free(flagstring);

1235

ifreq_flags flags = (ifreq_flags)tmpmax;

1236

/* Reject the loopback device */

1237

if(flags & IFF_LOOPBACK){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

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

1251

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

1252

if(debug){

1253

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

1254

if_entry->d_name);

1255

}

1256

return 1;

1257

}

1258

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

1259

if(not (flags & IFF_BROADCAST)){

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 0;

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

/* Accept this device */

1275

if(debug){

1276

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1277

if_entry->d_name);

1278

}

1279

return 1;

1280

}

1281

1282

int notdotentries(const struct dirent *direntry){

1283

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

1284

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

1285

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

1286

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

1287

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

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

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

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

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

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

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

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

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

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

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

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

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

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

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

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

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

1362

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

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

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

1368

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

1369

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

1370

block_time = ((retry_interval

1371

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

1372

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

1373

1374

if (debug){

1375

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

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

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

1395

servers, but don't block */

1396

}

1397

1398

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

1399

}

1400

if(ret != 0){

1401

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

1402

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

1403

}

1404

}

1405

}

1406

}

1407

1023

1408

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

1024

1409

AvahiSServiceBrowser *sb = NULL;

1025

1410

int error;

1027

1412

intmax_t tmpmax;

1028

1413

char *tmp;

1029

1414

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1415

const char *interface = "";

1031

1416

struct ifreq network;

1032

1417

int sd = -1;

1033

1418

bool take_down_interface = false;

1034

1419

uid_t uid;

1035

1420

gid_t gid;

1036

char *connect_to = NULL;

1037

1421

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

1038

1422

bool tempdir_created = false;

1039

1423

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1043

1427

bool gnutls_initialized = false;

1044

1428

bool gpgme_initialized = false;

1045

1429

float delay = 2.5f;

1430

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

1431

retrying the same server again */

1046

1432

1047

1433

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1434

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1440

errno = 0;

1055

1441

ret = setgid(gid);

1056

1442

if(ret == -1){

1057

perror("setgid");

1443

perror_plus("setgid");

1058

1444

}

1059

1445

1060

1446

/* Lower user privileges (temporarily) */

1061

1447

errno = 0;

1062

1448

ret = seteuid(uid);

1063

1449

if(ret == -1){

1064

perror("seteuid");

1450

perror_plus("seteuid");

1065

1451

}

1066

1452

1067

1453

if(quit_now){

1102

1488

.arg = "SECONDS",

1103

1489

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

1104

1490

.group = 2 },

1491

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

1492

.arg = "SECONDS",

1493

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

1494

.group = 2 },

1105

1495

/*

1106

1496

* These reproduce what we would get without ARGP_NO_HELP

1107

1497

*/

1151

1541

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

1152

1542

argp_error(state, "Bad delay");

1153

1543

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

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

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

1551

}

1154

1552

break;

1155

1553

/*

1156

1554

* These reproduce what we would get without ARGP_NO_HELP

1184

1582

case ENOMEM:

1185

1583

default:

1186

1584

errno = ret;

1187

perror("argp_parse");

1585

perror_plus("argp_parse");

1188

1586

exitcode = EX_OSERR;

1189

1587

goto end;

1190

1588

case EINVAL:

1192

1590

goto end;

1193

1591

}

1194

1592

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

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

1678

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

1679

/* setenv( XXX more here */

1680

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

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1689

}

1195

1690

1196

1691

if(not debug){

1197

1692

avahi_set_log_function(empty_log);

1198

1693

}

1199

1694

1695

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

1696

struct dirent **direntries;

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1698

alphasort);

1699

if(ret >= 1){

1700

/* Pick the first good interface */

1701

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

1702

if(debug){

1703

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

1704

}

1705

if(interface == NULL){

1706

perror_plus("malloc");

1707

free(direntries);

1708

exitcode = EXIT_FAILURE;

1709

goto end;

1710

}

1711

free(direntries);

1712

} else {

1713

free(direntries);

1714

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

1715

exitcode = EXIT_FAILURE;

1716

goto end;

1717

}

1718

}

1719

1200

1720

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

1201

1721

from the signal handler */

1202

1722

/* Initialize the pseudo-RNG for Avahi */

1211

1731

sigemptyset(&sigterm_action.sa_mask);

1212

1732

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

1213

1733

if(ret == -1){

1214

perror("sigaddset");

1734

perror_plus("sigaddset");

1215

1735

exitcode = EX_OSERR;

1216

1736

goto end;

1217

1737

}

1218

1738

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

1219

1739

if(ret == -1){

1220

perror("sigaddset");

1740

perror_plus("sigaddset");

1221

1741

exitcode = EX_OSERR;

1222

1742

goto end;

1223

1743

}

1224

1744

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

1225

1745

if(ret == -1){

1226

perror("sigaddset");

1746

perror_plus("sigaddset");

1227

1747

exitcode = EX_OSERR;

1228

1748

goto end;

1229

1749

}

1233

1753

*/

1234

1754

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

1235

1755

if(ret == -1){

1236

perror("sigaction");

1756

perror_plus("sigaction");

1237

1757

return EX_OSERR;

1238

1758

}

1239

1759

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1760

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

1241

1761

if(ret == -1){

1242

perror("sigaction");

1762

perror_plus("sigaction");

1243

1763

exitcode = EX_OSERR;

1244

1764

goto end;

1245

1765

}

1246

1766

}

1247

1767

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

1248

1768

if(ret == -1){

1249

perror("sigaction");

1769

perror_plus("sigaction");

1250

1770

return EX_OSERR;

1251

1771

}

1252

1772

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1773

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

1254

1774

if(ret == -1){

1255

perror("sigaction");

1775

perror_plus("sigaction");

1256

1776

exitcode = EX_OSERR;

1257

1777

goto end;

1258

1778

}

1259

1779

}

1260

1780

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

1261

1781

if(ret == -1){

1262

perror("sigaction");

1782

perror_plus("sigaction");

1263

1783

return EX_OSERR;

1264

1784

}

1265

1785

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1786

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

1267

1787

if(ret == -1){

1268

perror("sigaction");

1788

perror_plus("sigaction");

1269

1789

exitcode = EX_OSERR;

1270

1790

goto end;

1271

1791

}

1272

1792

}

1273

1793

1274

1794

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

1275

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

1795

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

1276

1796

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1797

if(if_index == 0){

1278

1798

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

1288

1808

errno = 0;

1289

1809

ret = seteuid(0);

1290

1810

if(ret == -1){

1291

perror("seteuid");

1811

perror_plus("seteuid");

1292

1812

}

1293

1813

1294

1814

#ifdef __linux__

1298

1818

bool restore_loglevel = true;

1299

1819

if(ret == -1){

1300

1820

restore_loglevel = false;

1301

perror("klogctl");

1821

perror_plus("klogctl");

1302

1822

}

1303

1823

#endif /* __linux__ */

1304

1824

1305

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1826

if(sd < 0){

1307

perror("socket");

1827

perror_plus("socket");

1308

1828

exitcode = EX_OSERR;

1309

1829

#ifdef __linux__

1310

1830

if(restore_loglevel){

1311

1831

ret = klogctl(7, NULL, 0);

1312

1832

if(ret == -1){

1313

perror("klogctl");

1833

perror_plus("klogctl");

1314

1834

}

1315

1835

}

1316

1836

#endif /* __linux__ */

1318

1838

errno = 0;

1319

1839

ret = seteuid(uid);

1320

1840

if(ret == -1){

1321

perror("seteuid");

1841

perror_plus("seteuid");

1322

1842

}

1323

1843

goto end;

1324

1844

}

1325

1845

strcpy(network.ifr_name, interface);

1326

1846

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

1327

1847

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1848

perror_plus("ioctl SIOCGIFFLAGS");

1329

1849

#ifdef __linux__

1330

1850

if(restore_loglevel){

1331

1851

ret = klogctl(7, NULL, 0);

1332

1852

if(ret == -1){

1333

perror("klogctl");

1853

perror_plus("klogctl");

1334

1854

}

1335

1855

}

1336

1856

#endif /* __linux__ */

1339

1859

errno = 0;

1340

1860

ret = seteuid(uid);

1341

1861

if(ret == -1){

1342

perror("seteuid");

1862

perror_plus("seteuid");

1343

1863

}

1344

1864

goto end;

1345

1865

}

1349

1869

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

1350

1870

if(ret == -1){

1351

1871

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1353

1873

exitcode = EX_OSERR;

1354

1874

#ifdef __linux__

1355

1875

if(restore_loglevel){

1356

1876

ret = klogctl(7, NULL, 0);

1357

1877

if(ret == -1){

1358

perror("klogctl");

1878

perror_plus("klogctl");

1359

1879

}

1360

1880

}

1361

1881

#endif /* __linux__ */

1363

1883

errno = 0;

1364

1884

ret = seteuid(uid);

1365

1885

if(ret == -1){

1366

perror("seteuid");

1886

perror_plus("seteuid");

1367

1887

}

1368

1888

goto end;

1369

1889

}

1370

1890

}

1371

/* sleep checking until interface is running */

1891

/* Sleep checking until interface is running.

1892

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

1372

1893

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

1373

1894

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

1374

1895

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1896

perror_plus("ioctl SIOCGIFFLAGS");

1376

1897

} else if(network.ifr_flags & IFF_RUNNING){

1377

1898

break;

1378

1899

}

1379

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

1901

ret = nanosleep(&sleeptime, NULL);

1381

1902

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

1382

perror("nanosleep");

1903

perror_plus("nanosleep");

1383

1904

}

1384

1905

}

1385

1906

if(not take_down_interface){

1386

1907

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

1387

1908

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

1388

1909

if(ret == -1){

1389

perror("close");

1910

perror_plus("close");

1390

1911

}

1391

1912

}

1392

1913

#ifdef __linux__

1394

1915

/* Restores kernel loglevel to default */

1395

1916

ret = klogctl(7, NULL, 0);

1396

1917

if(ret == -1){

1397

perror("klogctl");

1918

perror_plus("klogctl");

1398

1919

}

1399

1920

}

1400

1921

#endif /* __linux__ */

1404

1925

/* Lower privileges */

1405

1926

ret = seteuid(uid);

1406

1927

if(ret == -1){

1407

perror("seteuid");

1928

perror_plus("seteuid");

1408

1929

}

1409

1930

} else {

1410

1931

/* Lower privileges permanently */

1411

1932

ret = setuid(uid);

1412

1933

if(ret == -1){

1413

perror("setuid");

1934

perror_plus("setuid");

1414

1935

}

1415

1936

}

1416

1937

}

1432

1953

goto end;

1433

1954

}

1434

1955

1956

if(mkdtemp(tempdir) == NULL){

1957

perror_plus("mkdtemp");

1958

goto end;

1959

}

1435

1960

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

1439

goto end;

1440

}

1441

1961

1442

1962

if(quit_now){

1443

1963

goto end;

1485

2005

1486

2006

port = (uint16_t)tmpmax;

1487

2007

*address = '\0';

1488

address = connect_to;

1489

2008

/* Colon in address indicates IPv6 */

1490

2009

int af;

1491

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

2010

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

1492

2011

af = AF_INET6;

2012

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

2013

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

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

1493

2018

} else {

1494

2019

af = AF_INET;

1495

2020

}

2021

address = connect_to;

1496

2022

1497

2023

if(quit_now){

1498

2024

goto end;

1499

2025

}

1500

2026

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2027

while(not quit_now){

2028

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

2029

if(quit_now or ret == 0){

2030

break;

2031

}

2032

if(debug){

2033

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

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

2039

if (not quit_now){

1523

2040

exitcode = EXIT_SUCCESS;

1524

2041

}

2042

1525

2043

goto end;

1526

2044

}

1527

2045

1579

2097

if(debug){

1580

2098

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

1581

2099

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

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

2105

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

2106

}

1584

2107

1585

2108

end:

1586

2109

1607

2130

if(gpgme_initialized){

1608

2131

gpgme_release(mc.ctx);

1609

2132

}

2133

2134

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

2135

has seen */

2136

if(mc.current_server != NULL){

2137

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

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

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

1610

2146

1611

2147

/* Take down the network interface */

1612

2148

if(take_down_interface){

1614

2150

errno = 0;

1615

2151

ret = seteuid(0);

1616

2152

if(ret == -1){

1617

perror("seteuid");

2153

perror_plus("seteuid");

1618

2154

}

1619

2155

if(geteuid() == 0){

1620

2156

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

1621

2157

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

2158

perror_plus("ioctl SIOCGIFFLAGS");

1623

2159

} else if(network.ifr_flags & IFF_UP) {

1624

2160

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

1625

2161

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

1626

2162

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1628

2164

}

1629

2165

}

1630

2166

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

1631

2167

if(ret == -1){

1632

perror("close");

2168

perror_plus("close");

1633

2169

}

1634

2170

/* Lower privileges permanently */

1635

2171

errno = 0;

1636

2172

ret = setuid(uid);

1637

2173

if(ret == -1){

1638

perror("setuid");

2174

perror_plus("setuid");

1639

2175

}

1640

2176

}

1641

2177

}

1642

2178

1643

/* Removes the temp directory used by GPGME */

2179

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

1644

2180

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

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

2184

alphasort);

2185

if (numentries > 0){

2186

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

2187

direntry = direntries[i];

1665

2188

char *fullname = NULL;

1666

2189

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

1667

2190

direntry->d_name);

1668

2191

if(ret < 0){

1669

perror("asprintf");

2192

perror_plus("asprintf");

1670

2193

continue;

1671

2194

}

1672

2195

ret = remove(fullname);

1676

2199

}

1677

2200

free(fullname);

1678

2201

}

1679

closedir(d);

2202

}

2203

2204

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

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1680

2208

}

1681

2209

ret = rmdir(tempdir);

1682

2210

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

1683

perror("rmdir");

2211

perror_plus("rmdir");

1684

2212

}

1685

2213

}

1686

2214

1691

2219

&old_sigterm_action,

1692

2220

NULL));

1693

2221

if(ret == -1){

1694

perror("sigaction");

2222

perror_plus("sigaction");

1695

2223

}

1696

2224

do {

1697

2225

ret = raise(signal_received);

1698

2226

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

1699

2227

if(ret != 0){

1700

perror("raise");

2228

perror_plus("raise");

1701

2229

abort();

1702

2230

}

1703

2231

TEMP_FAILURE_RETRY(pause());