/mandos/trunk : revision 24.1.155

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

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,

128

127

static const char mandos_protocol_version[] = "1";

129

128

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

130

129

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

131

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

132

char *connect_to = NULL;

133

134

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

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

144

130

145

131

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

146

132

typedef struct {

151

137

gnutls_dh_params_t dh_params;

152

138

const char *priority;

153

139

gpgme_ctx_t ctx;

154

server *current_server;

155

140

} mandos_context;

156

141

157

142

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

158

143

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

159

144

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

145

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

162

146

163

147

sig_atomic_t quit_now = 0;

164

148

int signal_received = 0;

165

149

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

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

169

program_invocation_short_name);

170

perror(print_text);

171

}

172

173

150

/*

174

151

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

175

152

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

187

164

return buffer_capacity;

188

165

}

189

166

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

193

int ret;

194

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

195

if(new_server == NULL){

196

perror_plus("malloc");

197

return -1;

198

}

199

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

200

.port = port,

201

.if_index = if_index,

202

.af = af };

203

if(new_server->ip == NULL){

204

perror_plus("strdup");

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

209

new_server->next = new_server;

210

new_server->prev = new_server;

211

mc.current_server = new_server;

212

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

213

} else {

214

new_server->next = mc.current_server;

215

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

216

new_server->prev->next = new_server;

217

mc.current_server->prev = new_server;

218

}

219

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

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

225

}

226

227

167

/*

228

168

* Initialize GPGME.

229

169

*/

243

183

244

184

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

245

185

if(fd == -1){

246

perror_plus("open");

186

perror("open");

247

187

return false;

248

188

}

249

189

263

203

264

204

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

265

205

if(ret == -1){

266

perror_plus("close");

206

perror("close");

267

207

}

268

208

gpgme_data_release(pgp_data);

269

209

return true;

394

334

395

335

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

396

336

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

397

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

398

338

plaintext_length = -1;

399

339

goto decrypt_end;

400

340

}

405

345

(size_t)plaintext_length,

406

346

plaintext_capacity);

407

347

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

348

perror("incbuffer");

409

349

plaintext_length = -1;

410

350

goto decrypt_end;

411

351

}

418

358

break;

419

359

}

420

360

if(ret < 0){

421

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

422

362

plaintext_length = -1;

423

363

goto decrypt_end;

424

364

}

481

421

}

482

422

483

423

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

485

425

if(ret != GNUTLS_E_SUCCESS){

486

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

426

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

427

from

428

-Wunreachable-code

429

*/

487

430

safer_gnutls_strerror(ret));

488

431

gnutls_global_deinit();

489

432

return -1;

644

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

588

if(tcp_sd < 0){

646

589

int e = errno;

647

perror_plus("socket");

590

perror("socket");

648

591

errno = e;

649

592

goto mandos_end;

650

593

}

664

607

}

665

608

if(ret < 0 ){

666

609

int e = errno;

667

perror_plus("inet_pton");

610

perror("inet_pton");

668

611

errno = e;

669

612

goto mandos_end;

670

613

}

706

649

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

707

650

char interface[IF_NAMESIZE];

708

651

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

709

perror_plus("if_indextoname");

652

perror("if_indextoname");

710

653

} else {

711

654

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

712

655

ip, interface, port);

726

669

sizeof(addrstr));

727

670

}

728

671

if(pcret == NULL){

729

perror_plus("inet_ntop");

672

perror("inet_ntop");

730

673

} else {

731

674

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

732

675

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

745

688

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

746

689

}

747

690

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

691

int e = errno;

692

perror("connect");

693

errno = e;

753

694

goto mandos_end;

754

695

}

755

696

766

707

out_size - written));

767

708

if(ret == -1){

768

709

int e = errno;

769

perror_plus("write");

710

perror("write");

770

711

errno = e;

771

712

goto mandos_end;

772

713

}

797

738

goto mandos_end;

798

739

}

799

740

800

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

801

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

742

803

743

if(quit_now){

840

780

buffer_capacity);

841

781

if(buffer_capacity == 0){

842

782

int e = errno;

843

perror_plus("incbuffer");

783

perror("incbuffer");

844

784

errno = e;

845

785

goto mandos_end;

846

786

}

951

891

if(e == 0){

952

892

e = errno;

953

893

}

954

perror_plus("close");

894

perror("close");

955

895

}

956

896

gnutls_deinit(session);

957

errno = e;

958

897

if(quit_now){

959

errno = EINTR;

898

e = EINTR;

960

899

retval = -1;

961

900

}

901

errno = e;

962

902

}

963

903

return retval;

964

904

}

1007

947

avahi_proto_to_af(proto));

1008

948

if(ret == 0){

1009

949

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

950

}

1014

951

}

1015

952

}

1069

1006

}

1070

1007

}

1071

1008

1072

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

1009

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

1073

1010

static void handle_sigterm(int sig){

1074

1011

if(quit_now){

1075

1012

return;

1077

1014

quit_now = 1;

1078

1015

signal_received = sig;

1079

1016

int old_errno = errno;

1080

/* set main loop to exit */

1081

1017

if(mc.simple_poll != NULL){

1082

1018

avahi_simple_poll_quit(mc.simple_poll);

1083

1019

}

1084

1020

errno = old_errno;

1085

1021

}

1086

1022

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1188

}

1189

return 1;

1190

}

1191

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

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

1196

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

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1214

}

1215

ret = avahi_simple_poll_iterate(s, -1);

1216

} else {

1217

if (debug){

1218

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

1219

" or wait\n");

1220

}

1221

/* the current time */

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1223

if(ret == -1){

1224

perror_plus("clock_gettime");

1225

return -1;

1226

}

1227

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

1228

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

1229

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1231

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1233

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

1234

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

1235

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

1236

block_time = ((retry_interval

1237

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

1238

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

1239

1240

if (debug){

1241

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

1242

}

1243

1244

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1249

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1251

return 0;

1252

}

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1255

if(ret == -1){

1256

perror_plus("clock_gettime");

1257

return -1;

1258

}

1259

mc.current_server = mc.current_server->next;

1260

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

1261

servers, but don't block */

1262

}

1263

1264

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

1265

}

1266

if(ret != 0){

1267

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

1268

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

1269

}

1270

}

1271

}

1272

}

1273

1274

1023

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

1275

1024

AvahiSServiceBrowser *sb = NULL;

1276

1025

int error;

1278

1027

intmax_t tmpmax;

1279

1028

char *tmp;

1280

1029

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

1030

const char *interface = "eth0";

1282

1031

struct ifreq network;

1283

1032

int sd = -1;

1284

1033

bool take_down_interface = false;

1285

1034

uid_t uid;

1286

1035

gid_t gid;

1036

char *connect_to = NULL;

1287

1037

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

1288

1038

bool tempdir_created = false;

1289

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1293

1043

bool gnutls_initialized = false;

1294

1044

bool gpgme_initialized = false;

1295

1045

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

1046

1299

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1300

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1306

1054

errno = 0;

1307

1055

ret = setgid(gid);

1308

1056

if(ret == -1){

1309

perror_plus("setgid");

1057

perror("setgid");

1310

1058

}

1311

1059

1312

1060

/* Lower user privileges (temporarily) */

1313

1061

errno = 0;

1314

1062

ret = seteuid(uid);

1315

1063

if(ret == -1){

1316

perror_plus("seteuid");

1064

perror("seteuid");

1317

1065

}

1318

1066

1319

1067

if(quit_now){

1354

1102

.arg = "SECONDS",

1355

1103

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

1356

1104

.group = 2 },

1357

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

1358

.arg = "SECONDS",

1359

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

1360

.group = 2 },

1361

1105

/*

1362

1106

* These reproduce what we would get without ARGP_NO_HELP

1363

1107

*/

1407

1151

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

1408

1152

argp_error(state, "Bad delay");

1409

1153

}

1410

case 132: /* --retry */

1411

errno = 0;

1412

retry_interval = strtod(arg, &tmp);

1413

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

1414

or (retry_interval * 1000) > INT_MAX){

1415

argp_error(state, "Bad retry interval");

1416

}

1417

1154

break;

1418

1155

/*

1419

1156

* These reproduce what we would get without ARGP_NO_HELP

1447

1184

case ENOMEM:

1448

1185

default:

1449

1186

errno = ret;

1450

perror_plus("argp_parse");

1187

perror("argp_parse");

1451

1188

exitcode = EX_OSERR;

1452

1189

goto end;

1453

1190

case EINVAL:

1455

1192

goto end;

1456

1193

}

1457

1194

}

1458

1459

{

1460

/* Work around Debian bug #633582:

1461

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

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1512

}

1513

}

1514

1195

1515

1196

if(not debug){

1516

1197

avahi_set_log_function(empty_log);

1517

1198

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

1543

1199

1544

1200

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

1545

1201

from the signal handler */

1555

1211

sigemptyset(&sigterm_action.sa_mask);

1556

1212

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

1557

1213

if(ret == -1){

1558

perror_plus("sigaddset");

1214

perror("sigaddset");

1559

1215

exitcode = EX_OSERR;

1560

1216

goto end;

1561

1217

}

1562

1218

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

1563

1219

if(ret == -1){

1564

perror_plus("sigaddset");

1220

perror("sigaddset");

1565

1221

exitcode = EX_OSERR;

1566

1222

goto end;

1567

1223

}

1568

1224

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

1569

1225

if(ret == -1){

1570

perror_plus("sigaddset");

1226

perror("sigaddset");

1571

1227

exitcode = EX_OSERR;

1572

1228

goto end;

1573

1229

}

1577

1233

*/

1578

1234

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

1579

1235

if(ret == -1){

1580

perror_plus("sigaction");

1236

perror("sigaction");

1581

1237

return EX_OSERR;

1582

1238

}

1583

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1584

1240

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

1585

1241

if(ret == -1){

1586

perror_plus("sigaction");

1242

perror("sigaction");

1587

1243

exitcode = EX_OSERR;

1588

1244

goto end;

1589

1245

}

1590

1246

}

1591

1247

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

1592

1248

if(ret == -1){

1593

perror_plus("sigaction");

1249

perror("sigaction");

1594

1250

return EX_OSERR;

1595

1251

}

1596

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1597

1253

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

1598

1254

if(ret == -1){

1599

perror_plus("sigaction");

1255

perror("sigaction");

1600

1256

exitcode = EX_OSERR;

1601

1257

goto end;

1602

1258

}

1603

1259

}

1604

1260

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

1605

1261

if(ret == -1){

1606

perror_plus("sigaction");

1262

perror("sigaction");

1607

1263

return EX_OSERR;

1608

1264

}

1609

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1610

1266

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

1611

1267

if(ret == -1){

1612

perror_plus("sigaction");

1268

perror("sigaction");

1613

1269

exitcode = EX_OSERR;

1614

1270

goto end;

1615

1271

}

1616

1272

}

1617

1273

1618

1274

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

1619

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

1275

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

1620

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1277

if(if_index == 0){

1622

1278

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

1632

1288

errno = 0;

1633

1289

ret = seteuid(0);

1634

1290

if(ret == -1){

1635

perror_plus("seteuid");

1291

perror("seteuid");

1636

1292

}

1637

1293

1638

1294

#ifdef __linux__

1642

1298

bool restore_loglevel = true;

1643

1299

if(ret == -1){

1644

1300

restore_loglevel = false;

1645

perror_plus("klogctl");

1301

perror("klogctl");

1646

1302

}

1647

1303

#endif /* __linux__ */

1648

1304

1649

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

1306

if(sd < 0){

1651

perror_plus("socket");

1307

perror("socket");

1652

1308

exitcode = EX_OSERR;

1653

1309

#ifdef __linux__

1654

1310

if(restore_loglevel){

1655

1311

ret = klogctl(7, NULL, 0);

1656

1312

if(ret == -1){

1657

perror_plus("klogctl");

1313

perror("klogctl");

1658

1314

}

1659

1315

}

1660

1316

#endif /* __linux__ */

1662

1318

errno = 0;

1663

1319

ret = seteuid(uid);

1664

1320

if(ret == -1){

1665

perror_plus("seteuid");

1321

perror("seteuid");

1666

1322

}

1667

1323

goto end;

1668

1324

}

1669

1325

strcpy(network.ifr_name, interface);

1670

1326

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

1671

1327

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1328

perror("ioctl SIOCGIFFLAGS");

1673

1329

#ifdef __linux__

1674

1330

if(restore_loglevel){

1675

1331

ret = klogctl(7, NULL, 0);

1676

1332

if(ret == -1){

1677

perror_plus("klogctl");

1333

perror("klogctl");

1678

1334

}

1679

1335

}

1680

1336

#endif /* __linux__ */

1683

1339

errno = 0;

1684

1340

ret = seteuid(uid);

1685

1341

if(ret == -1){

1686

perror_plus("seteuid");

1342

perror("seteuid");

1687

1343

}

1688

1344

goto end;

1689

1345

}

1693

1349

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

1694

1350

if(ret == -1){

1695

1351

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1352

perror("ioctl SIOCSIFFLAGS");

1697

1353

exitcode = EX_OSERR;

1698

1354

#ifdef __linux__

1699

1355

if(restore_loglevel){

1700

1356

ret = klogctl(7, NULL, 0);

1701

1357

if(ret == -1){

1702

perror_plus("klogctl");

1358

perror("klogctl");

1703

1359

}

1704

1360

}

1705

1361

#endif /* __linux__ */

1707

1363

errno = 0;

1708

1364

ret = seteuid(uid);

1709

1365

if(ret == -1){

1710

perror_plus("seteuid");

1366

perror("seteuid");

1711

1367

}

1712

1368

goto end;

1713

1369

}

1714

1370

}

1715

/* Sleep checking until interface is running.

1716

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

1371

/* sleep checking until interface is running */

1717

1372

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

1718

1373

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

1719

1374

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1375

perror("ioctl SIOCGIFFLAGS");

1721

1376

} else if(network.ifr_flags & IFF_RUNNING){

1722

1377

break;

1723

1378

}

1724

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

1380

ret = nanosleep(&sleeptime, NULL);

1726

1381

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

1727

perror_plus("nanosleep");

1382

perror("nanosleep");

1728

1383

}

1729

1384

}

1730

1385

if(not take_down_interface){

1731

1386

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

1732

1387

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

1733

1388

if(ret == -1){

1734

perror_plus("close");

1389

perror("close");

1735

1390

}

1736

1391

}

1737

1392

#ifdef __linux__

1739

1394

/* Restores kernel loglevel to default */

1740

1395

ret = klogctl(7, NULL, 0);

1741

1396

if(ret == -1){

1742

perror_plus("klogctl");

1397

perror("klogctl");

1743

1398

}

1744

1399

}

1745

1400

#endif /* __linux__ */

1749

1404

/* Lower privileges */

1750

1405

ret = seteuid(uid);

1751

1406

if(ret == -1){

1752

perror_plus("seteuid");

1407

perror("seteuid");

1753

1408

}

1754

1409

} else {

1755

1410

/* Lower privileges permanently */

1756

1411

ret = setuid(uid);

1757

1412

if(ret == -1){

1758

perror_plus("setuid");

1413

perror("setuid");

1759

1414

}

1760

1415

}

1761

1416

}

1777

1432

goto end;

1778

1433

}

1779

1434

1435

tempdir_created = true;

1780

1436

if(mkdtemp(tempdir) == NULL){

1781

perror_plus("mkdtemp");

1437

tempdir_created = false;

1438

perror("mkdtemp");

1782

1439

goto end;

1783

1440

}

1784

tempdir_created = true;

1785

1441

1786

1442

if(quit_now){

1787

1443

goto end;

1841

1497

if(quit_now){

1842

1498

goto end;

1843

1499

}

1844

1845

while(not quit_now){

1846

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

1847

if(quit_now or ret == 0){

1500

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;

1848

1520

break;

1849

1521

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

1522

} else {

1854

1523

exitcode = EXIT_SUCCESS;

1855

1524

}

1856

1857

1525

goto end;

1858

1526

}

1859

1527

1911

1579

if(debug){

1912

1580

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

1913

1581

}

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

1917

if(debug){

1918

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

1919

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

1920

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

1921

1584

1922

1585

end:

1923

1586

1944

1607

if(gpgme_initialized){

1945

1608

gpgme_release(mc.ctx);

1946

1609

}

1947

1948

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

1949

has seen */

1950

if(mc.current_server != NULL){

1951

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

1952

while(mc.current_server != NULL){

1953

server *next = mc.current_server->next;

1954

free(mc.current_server);

1955

mc.current_server = next;

1956

}

1957

}

1958

1610

1959

1611

/* Take down the network interface */

1960

1612

if(take_down_interface){

1962

1614

errno = 0;

1963

1615

ret = seteuid(0);

1964

1616

if(ret == -1){

1965

perror_plus("seteuid");

1617

perror("seteuid");

1966

1618

}

1967

1619

if(geteuid() == 0){

1968

1620

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

1969

1621

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1622

perror("ioctl SIOCGIFFLAGS");

1971

1623

} else if(network.ifr_flags & IFF_UP) {

1972

1624

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

1973

1625

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

1974

1626

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1627

perror("ioctl SIOCSIFFLAGS");

1976

1628

}

1977

1629

}

1978

1630

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

1979

1631

if(ret == -1){

1980

perror_plus("close");

1632

perror("close");

1981

1633

}

1982

1634

/* Lower privileges permanently */

1983

1635

errno = 0;

1984

1636

ret = setuid(uid);

1985

1637

if(ret == -1){

1986

perror_plus("setuid");

1638

perror("setuid");

1987

1639

}

1988

1640

}

1989

1641

}

1990

1642

1991

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

1643

/* Removes the temp directory used by GPGME */

1992

1644

if(tempdir_created){

1993

struct dirent **direntries = NULL;

1994

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

1998

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

}

1999

1665

char *fullname = NULL;

2000

1666

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

2001

1667

direntry->d_name);

2002

1668

if(ret < 0){

2003

perror_plus("asprintf");

1669

perror("asprintf");

2004

1670

continue;

2005

1671

}

2006

1672

ret = remove(fullname);

2010

1676

}

2011

1677

free(fullname);

2012

1678

}

2013

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2017

free(direntries);

2018

if (ret == -1){

2019

perror_plus("scandir");

1679

closedir(d);

2020

1680

}

2021

1681

ret = rmdir(tempdir);

2022

1682

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

2023

perror_plus("rmdir");

1683

perror("rmdir");

2024

1684

}

2025

1685

}

2026

1686

2031

1691

&old_sigterm_action,

2032

1692

NULL));

2033

1693

if(ret == -1){

2034

perror_plus("sigaction");

1694

perror("sigaction");

2035

1695

}

2036

1696

do {

2037

1697

ret = raise(signal_received);

2038

1698

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

2039

1699

if(ret != 0){

2040

perror_plus("raise");

1700

perror("raise");

2041

1701

abort();

2042

1702

}

2043

1703

TEMP_FAILURE_RETRY(pause());