/mandos/release : revision 24.1.151

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@recompile.se>.

29

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

30

*/

31

32

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

56

#include <sys/stat.h> /* open() */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

123

122

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

124

123

#define SECKEY "seckey.txt"

125

124

#define PUBKEY "pubkey.txt"

126

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

127

125

128

126

bool debug = false;

129

127

static const char mandos_protocol_version[] = "1";

130

128

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

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;

129

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

145

130

146

131

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

147

132

typedef struct {

152

137

gnutls_dh_params_t dh_params;

153

138

const char *priority;

154

139

gpgme_ctx_t ctx;

155

server *current_server;

156

140

} mandos_context;

157

141

158

142

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

159

143

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

160

144

.dh_bits = 1024, .priority = "SECURE256"

161

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

162

.current_server = NULL };

145

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

163

146

164

147

sig_atomic_t quit_now = 0;

165

148

int signal_received = 0;

166

149

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

150

/*

175

151

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

176

152

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

188

164

return buffer_capacity;

189

165

}

190

166

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

229

167

/*

230

168

* Initialize GPGME.

231

169

*/

245

183

246

184

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

247

185

if(fd == -1){

248

perror_plus("open");

186

perror("open");

249

187

return false;

250

188

}

251

189

265

203

266

204

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

267

205

if(ret == -1){

268

perror_plus("close");

206

perror("close");

269

207

}

270

208

gpgme_data_release(pgp_data);

271

209

return true;

284

222

return false;

285

223

}

286

224

287

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

225

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

288

226

rc = gpgme_get_engine_info(&engine_info);

289

227

if(rc != GPG_ERR_NO_ERROR){

290

228

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

396

334

397

335

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

398

336

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

399

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

400

338

plaintext_length = -1;

401

339

goto decrypt_end;

402

340

}

407

345

(size_t)plaintext_length,

408

346

plaintext_capacity);

409

347

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

348

perror("incbuffer");

411

349

plaintext_length = -1;

412

350

goto decrypt_end;

413

351

}

420

358

break;

421

359

}

422

360

if(ret < 0){

423

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

424

362

plaintext_length = -1;

425

363

goto decrypt_end;

426

364

}

483

421

}

484

422

485

423

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

487

425

if(ret != GNUTLS_E_SUCCESS){

488

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

426

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

427

from

428

-Wunreachable-code

429

*/

489

430

safer_gnutls_strerror(ret));

490

431

gnutls_global_deinit();

491

432

return -1;

646

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

647

588

if(tcp_sd < 0){

648

589

int e = errno;

649

perror_plus("socket");

590

perror("socket");

650

591

errno = e;

651

592

goto mandos_end;

652

593

}

666

607

}

667

608

if(ret < 0 ){

668

609

int e = errno;

669

perror_plus("inet_pton");

610

perror("inet_pton");

670

611

errno = e;

671

612

goto mandos_end;

672

613

}

708

649

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

709

650

char interface[IF_NAMESIZE];

710

651

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

711

perror_plus("if_indextoname");

652

perror("if_indextoname");

712

653

} else {

713

654

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

714

655

ip, interface, port);

728

669

sizeof(addrstr));

729

670

}

730

671

if(pcret == NULL){

731

perror_plus("inet_ntop");

672

perror("inet_ntop");

732

673

} else {

733

674

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

734

675

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

747

688

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

748

689

}

749

690

if(ret < 0){

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

691

int e = errno;

692

perror("connect");

693

errno = e;

755

694

goto mandos_end;

756

695

}

757

696

768

707

out_size - written));

769

708

if(ret == -1){

770

709

int e = errno;

771

perror_plus("write");

710

perror("write");

772

711

errno = e;

773

712

goto mandos_end;

774

713

}

799

738

goto mandos_end;

800

739

}

801

740

802

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

803

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

804

742

805

743

if(quit_now){

842

780

buffer_capacity);

843

781

if(buffer_capacity == 0){

844

782

int e = errno;

845

perror_plus("incbuffer");

783

perror("incbuffer");

846

784

errno = e;

847

785

goto mandos_end;

848

786

}

953

891

if(e == 0){

954

892

e = errno;

955

893

}

956

perror_plus("close");

894

perror("close");

957

895

}

958

896

gnutls_deinit(session);

959

errno = e;

960

897

if(quit_now){

961

errno = EINTR;

898

e = EINTR;

962

899

retval = -1;

963

900

}

901

errno = e;

964

902

}

965

903

return retval;

966

904

}

1009

947

avahi_proto_to_af(proto));

1010

948

if(ret == 0){

1011

949

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1015

950

}

1016

951

}

1017

952

}

1071

1006

}

1072

1007

}

1073

1008

1074

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

1009

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

1075

1010

static void handle_sigterm(int sig){

1076

1011

if(quit_now){

1077

1012

return;

1079

1014

quit_now = 1;

1080

1015

signal_received = sig;

1081

1016

int old_errno = errno;

1082

/* set main loop to exit */

1083

1017

if(mc.simple_poll != NULL){

1084

1018

avahi_simple_poll_quit(mc.simple_poll);

1085

1019

}

1086

1020

errno = old_errno;

1087

1021

}

1088

1022

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

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

1156

return 0;

1157

}

1158

1159

struct ifreq ifr;

1160

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

1161

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1217

int notdotentries(const struct dirent *direntry){

1218

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

1219

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

1220

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

1221

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

1222

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

1223

return 0;

1224

}

1225

return 1;

1226

}

1227

1228

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

1229

int runnable_hook(const struct dirent *direntry){

1230

int ret;

1231

struct stat st;

1232

1233

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

1234

/* Empty name? */

1235

return 0;

1236

}

1237

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1255

if(ret == -1){

1256

if(debug){

1257

perror_plus("Could not stat plugin");

1258

}

1259

return 0;

1260

}

1261

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

1262

/* Not a regular file */

1263

return 0;

1264

}

1265

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

1266

/* Not executable */

1267

return 0;

1268

}

1269

return 1;

1270

}

1271

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1273

int ret;

1274

struct timespec now;

1275

struct timespec waited_time;

1276

intmax_t block_time;

1277

1278

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1283

}

1284

ret = avahi_simple_poll_iterate(s, -1);

1285

} else {

1286

if (debug){

1287

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

1288

" or wait\n");

1289

}

1290

/* the current time */

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1292

if(ret == -1){

1293

perror_plus("clock_gettime");

1294

return -1;

1295

}

1296

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

1297

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

1298

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1300

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1302

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

1303

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

1304

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

1305

block_time = ((retry_interval

1306

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

1307

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

1308

1309

if (debug){

1310

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

1311

}

1312

1313

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1318

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1320

return 0;

1321

}

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1324

if(ret == -1){

1325

perror_plus("clock_gettime");

1326

return -1;

1327

}

1328

mc.current_server = mc.current_server->next;

1329

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

1330

servers, but don't block */

1331

}

1332

1333

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

1334

}

1335

if(ret != 0){

1336

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

1337

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

1338

}

1339

}

1340

}

1341

}

1342

1343

1023

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

1344

1024

AvahiSServiceBrowser *sb = NULL;

1345

1025

int error;

1347

1027

intmax_t tmpmax;

1348

1028

char *tmp;

1349

1029

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1030

const char *interface = "eth0";

1351

1031

struct ifreq network;

1352

1032

int sd = -1;

1353

1033

bool take_down_interface = false;

1354

1034

uid_t uid;

1355

1035

gid_t gid;

1036

char *connect_to = NULL;

1356

1037

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

1357

1038

bool tempdir_created = false;

1358

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1362

1043

bool gnutls_initialized = false;

1363

1044

bool gpgme_initialized = false;

1364

1045

float delay = 2.5f;

1365

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

1366

retrying the same server again */

1367

1046

1368

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1369

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1375

1054

errno = 0;

1376

1055

ret = setgid(gid);

1377

1056

if(ret == -1){

1378

perror_plus("setgid");

1057

perror("setgid");

1379

1058

}

1380

1059

1381

1060

/* Lower user privileges (temporarily) */

1382

1061

errno = 0;

1383

1062

ret = seteuid(uid);

1384

1063

if(ret == -1){

1385

perror_plus("seteuid");

1064

perror("seteuid");

1386

1065

}

1387

1066

1388

1067

if(quit_now){

1423

1102

.arg = "SECONDS",

1424

1103

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

1425

1104

.group = 2 },

1426

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

1427

.arg = "SECONDS",

1428

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

1429

.group = 2 },

1430

1105

/*

1431

1106

* These reproduce what we would get without ARGP_NO_HELP

1432

1107

*/

1476

1151

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

1477

1152

argp_error(state, "Bad delay");

1478

1153

}

1479

case 132: /* --retry */

1480

errno = 0;

1481

retry_interval = strtod(arg, &tmp);

1482

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

1483

or (retry_interval * 1000) > INT_MAX

1484

or retry_interval < 0){

1485

argp_error(state, "Bad retry interval");

1486

}

1487

1154

break;

1488

1155

/*

1489

1156

* These reproduce what we would get without ARGP_NO_HELP

1517

1184

case ENOMEM:

1518

1185

default:

1519

1186

errno = ret;

1520

perror_plus("argp_parse");

1187

perror("argp_parse");

1521

1188

exitcode = EX_OSERR;

1522

1189

goto end;

1523

1190

case EINVAL:

1525

1192

goto end;

1526

1193

}

1527

1194

}

1528

1529

{

1530

/* Work around Debian bug #633582:

1531

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

ret = setenv("DEVICE", interface, 1);

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

ret = asprintf(&delaystring, "%f", delay);

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

ret = setenv("DELAY", delaystring, 1);

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

1648

}

1649

1195

1650

1196

if(not debug){

1651

1197

avahi_set_log_function(empty_log);

1652

1198

}

1653

1199

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1686

1200

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

1687

1201

from the signal handler */

1688

1202

/* Initialize the pseudo-RNG for Avahi */

1697

1211

sigemptyset(&sigterm_action.sa_mask);

1698

1212

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

1699

1213

if(ret == -1){

1700

perror_plus("sigaddset");

1214

perror("sigaddset");

1701

1215

exitcode = EX_OSERR;

1702

1216

goto end;

1703

1217

}

1704

1218

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

1705

1219

if(ret == -1){

1706

perror_plus("sigaddset");

1220

perror("sigaddset");

1707

1221

exitcode = EX_OSERR;

1708

1222

goto end;

1709

1223

}

1710

1224

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

1711

1225

if(ret == -1){

1712

perror_plus("sigaddset");

1226

perror("sigaddset");

1713

1227

exitcode = EX_OSERR;

1714

1228

goto end;

1715

1229

}

1719

1233

*/

1720

1234

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

1721

1235

if(ret == -1){

1722

perror_plus("sigaction");

1236

perror("sigaction");

1723

1237

return EX_OSERR;

1724

1238

}

1725

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1726

1240

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

1727

1241

if(ret == -1){

1728

perror_plus("sigaction");

1242

perror("sigaction");

1729

1243

exitcode = EX_OSERR;

1730

1244

goto end;

1731

1245

}

1732

1246

}

1733

1247

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

1734

1248

if(ret == -1){

1735

perror_plus("sigaction");

1249

perror("sigaction");

1736

1250

return EX_OSERR;

1737

1251

}

1738

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1739

1253

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

1740

1254

if(ret == -1){

1741

perror_plus("sigaction");

1255

perror("sigaction");

1742

1256

exitcode = EX_OSERR;

1743

1257

goto end;

1744

1258

}

1745

1259

}

1746

1260

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

1747

1261

if(ret == -1){

1748

perror_plus("sigaction");

1262

perror("sigaction");

1749

1263

return EX_OSERR;

1750

1264

}

1751

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1752

1266

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

1753

1267

if(ret == -1){

1754

perror_plus("sigaction");

1268

perror("sigaction");

1755

1269

exitcode = EX_OSERR;

1756

1270

goto end;

1757

1271

}

1758

1272

}

1759

1273

1760

1274

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

1761

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

1275

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

1762

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

1277

if(if_index == 0){

1764

1278

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

1774

1288

errno = 0;

1775

1289

ret = seteuid(0);

1776

1290

if(ret == -1){

1777

perror_plus("seteuid");

1291

perror("seteuid");

1778

1292

}

1779

1293

1780

1294

#ifdef __linux__

1784

1298

bool restore_loglevel = true;

1785

1299

if(ret == -1){

1786

1300

restore_loglevel = false;

1787

perror_plus("klogctl");

1301

perror("klogctl");

1788

1302

}

1789

1303

#endif /* __linux__ */

1790

1304

1791

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

1306

if(sd < 0){

1793

perror_plus("socket");

1307

perror("socket");

1794

1308

exitcode = EX_OSERR;

1795

1309

#ifdef __linux__

1796

1310

if(restore_loglevel){

1797

1311

ret = klogctl(7, NULL, 0);

1798

1312

if(ret == -1){

1799

perror_plus("klogctl");

1313

perror("klogctl");

1800

1314

}

1801

1315

}

1802

1316

#endif /* __linux__ */

1804

1318

errno = 0;

1805

1319

ret = seteuid(uid);

1806

1320

if(ret == -1){

1807

perror_plus("seteuid");

1321

perror("seteuid");

1808

1322

}

1809

1323

goto end;

1810

1324

}

1811

1325

strcpy(network.ifr_name, interface);

1812

1326

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

1813

1327

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1328

perror("ioctl SIOCGIFFLAGS");

1815

1329

#ifdef __linux__

1816

1330

if(restore_loglevel){

1817

1331

ret = klogctl(7, NULL, 0);

1818

1332

if(ret == -1){

1819

perror_plus("klogctl");

1333

perror("klogctl");

1820

1334

}

1821

1335

}

1822

1336

#endif /* __linux__ */

1825

1339

errno = 0;

1826

1340

ret = seteuid(uid);

1827

1341

if(ret == -1){

1828

perror_plus("seteuid");

1342

perror("seteuid");

1829

1343

}

1830

1344

goto end;

1831

1345

}

1835

1349

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

1836

1350

if(ret == -1){

1837

1351

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1352

perror("ioctl SIOCSIFFLAGS");

1839

1353

exitcode = EX_OSERR;

1840

1354

#ifdef __linux__

1841

1355

if(restore_loglevel){

1842

1356

ret = klogctl(7, NULL, 0);

1843

1357

if(ret == -1){

1844

perror_plus("klogctl");

1358

perror("klogctl");

1845

1359

}

1846

1360

}

1847

1361

#endif /* __linux__ */

1849

1363

errno = 0;

1850

1364

ret = seteuid(uid);

1851

1365

if(ret == -1){

1852

perror_plus("seteuid");

1366

perror("seteuid");

1853

1367

}

1854

1368

goto end;

1855

1369

}

1856

1370

}

1857

/* Sleep checking until interface is running.

1858

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

1371

/* sleep checking until interface is running */

1859

1372

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

1860

1373

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

1861

1374

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1375

perror("ioctl SIOCGIFFLAGS");

1863

1376

} else if(network.ifr_flags & IFF_RUNNING){

1864

1377

break;

1865

1378

}

1866

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

1380

ret = nanosleep(&sleeptime, NULL);

1868

1381

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

1869

perror_plus("nanosleep");

1382

perror("nanosleep");

1870

1383

}

1871

1384

}

1872

1385

if(not take_down_interface){

1873

1386

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

1874

1387

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

1875

1388

if(ret == -1){

1876

perror_plus("close");

1389

perror("close");

1877

1390

}

1878

1391

}

1879

1392

#ifdef __linux__

1881

1394

/* Restores kernel loglevel to default */

1882

1395

ret = klogctl(7, NULL, 0);

1883

1396

if(ret == -1){

1884

perror_plus("klogctl");

1397

perror("klogctl");

1885

1398

}

1886

1399

}

1887

1400

#endif /* __linux__ */

1891

1404

/* Lower privileges */

1892

1405

ret = seteuid(uid);

1893

1406

if(ret == -1){

1894

perror_plus("seteuid");

1407

perror("seteuid");

1895

1408

}

1896

1409

} else {

1897

1410

/* Lower privileges permanently */

1898

1411

ret = setuid(uid);

1899

1412

if(ret == -1){

1900

perror_plus("setuid");

1413

perror("setuid");

1901

1414

}

1902

1415

}

1903

1416

}

1919

1432

goto end;

1920

1433

}

1921

1434

1435

tempdir_created = true;

1922

1436

if(mkdtemp(tempdir) == NULL){

1923

perror_plus("mkdtemp");

1437

tempdir_created = false;

1438

perror("mkdtemp");

1924

1439

goto end;

1925

1440

}

1926

tempdir_created = true;

1927

1441

1928

1442

if(quit_now){

1929

1443

goto end;

1971

1485

1972

1486

port = (uint16_t)tmpmax;

1973

1487

*address = '\0';

1488

address = connect_to;

1974

1489

/* Colon in address indicates IPv6 */

1975

1490

int af;

1976

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

1491

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

1977

1492

af = AF_INET6;

1978

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

1979

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

1980

{

1981

connect_to++;

1982

address[-1] = '\0';

1983

}

1984

1493

} else {

1985

1494

af = AF_INET;

1986

1495

}

1987

address = connect_to;

1988

1496

1989

1497

if(quit_now){

1990

1498

goto end;

1991

1499

}

1992

1500

1993

while(not quit_now){

1994

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

1995

if(quit_now or ret == 0){

1996

break;

1997

}

1998

if(debug){

1999

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

2000

(int)retry_interval);

2001

}

2002

sleep((int)retry_interval);

2003

}

2004

2005

if (not quit_now){

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 {

2006

1523

exitcode = EXIT_SUCCESS;

2007

1524

}

2008

2009

1525

goto end;

2010

1526

}

2011

1527

2063

1579

if(debug){

2064

1580

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

2065

1581

}

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2069

if(debug){

2070

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

2071

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

2072

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2073

1584

2074

1585

end:

2075

1586

2096

1607

if(gpgme_initialized){

2097

1608

gpgme_release(mc.ctx);

2098

1609

}

2099

2100

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

2101

has seen */

2102

if(mc.current_server != NULL){

2103

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

2104

while(mc.current_server != NULL){

2105

server *next = mc.current_server->next;

2106

free(mc.current_server);

2107

mc.current_server = next;

2108

}

2109

}

2110

2111

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

2112

1610

2113

1611

/* Take down the network interface */

2114

1612

if(take_down_interface){

2116

1614

errno = 0;

2117

1615

ret = seteuid(0);

2118

1616

if(ret == -1){

2119

perror_plus("seteuid");

1617

perror("seteuid");

2120

1618

}

2121

1619

if(geteuid() == 0){

2122

1620

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

2123

1621

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

1622

perror("ioctl SIOCGIFFLAGS");

2125

1623

} else if(network.ifr_flags & IFF_UP) {

2126

1624

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

2127

1625

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

2128

1626

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1627

perror("ioctl SIOCSIFFLAGS");

2130

1628

}

2131

1629

}

2132

1630

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

2133

1631

if(ret == -1){

2134

perror_plus("close");

1632

perror("close");

2135

1633

}

2136

1634

/* Lower privileges permanently */

2137

1635

errno = 0;

2138

1636

ret = setuid(uid);

2139

1637

if(ret == -1){

2140

perror_plus("setuid");

1638

perror("setuid");

2141

1639

}

2142

1640

}

2143

1641

}

2144

1642

2145

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

1643

/* Removes the temp directory used by GPGME */

2146

1644

if(tempdir_created){

2147

struct dirent **direntries = NULL;

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

2152

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

2153

direntry = direntries[i];

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

}

2154

1665

char *fullname = NULL;

2155

1666

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

2156

1667

direntry->d_name);

2157

1668

if(ret < 0){

2158

perror_plus("asprintf");

1669

perror("asprintf");

2159

1670

continue;

2160

1671

}

2161

1672

ret = remove(fullname);

2165

1676

}

2166

1677

free(fullname);

2167

1678

}

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

1679

closedir(d);

2174

1680

}

2175

1681

ret = rmdir(tempdir);

2176

1682

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

2177

perror_plus("rmdir");

1683

perror("rmdir");

2178

1684

}

2179

1685

}

2180

1686

2185

1691

&old_sigterm_action,

2186

1692

NULL));

2187

1693

if(ret == -1){

2188

perror_plus("sigaction");

1694

perror("sigaction");

2189

1695

}

2190

1696

do {

2191

1697

ret = raise(signal_received);

2192

1698

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

2193

1699

if(ret != 0){

2194

perror_plus("raise");

1700

perror("raise");

2195

1701

abort();

2196

1702

}

2197

1703

TEMP_FAILURE_RETRY(pause());