/mandos/trunk : revision 24.1.161

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, program_invocation_short_name */

66

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

65

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

66

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

67

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

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

127

static const char mandos_protocol_version[] = "1";

128

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

129

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

130

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

131

char *connect_to = NULL;

132

133

/* Doubly linked list that need to be circular linked when ever used */

134

typedef struct server{

135

const char *ip;

136

uint16_t port;

137

AvahiIfIndex if_index;

138

int af;

139

struct timespec last_seen;

140

struct server *next;

141

struct server *prev;

142

} server;

143

130

144

131

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

145

132

typedef struct {

150

137

gnutls_dh_params_t dh_params;

151

138

const char *priority;

152

139

gpgme_ctx_t ctx;

153

server *current_server;

154

140

} mandos_context;

155

141

156

142

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

157

143

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

158

144

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

145

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

160

146

161

147

sig_atomic_t quit_now = 0;

162

148

int signal_received = 0;

163

149

164

/* Function to use when printing errors */

165

void perror_plus(const char *print_text){

166

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

167

perror(print_text);

168

}

169

170

150

/*

171

151

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

172

152

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

184

164

return buffer_capacity;

185

165

}

186

166

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

190

int ret;

191

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

192

if(new_server == NULL){

193

perror_plus("malloc");

194

return -1;

195

}

196

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

200

if(new_server->ip == NULL){

201

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

206

new_server->next = new_server;

207

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

210

} else {

211

new_server->next = mc.current_server;

212

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

213

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

222

}

223

224

167

/*

225

168

* Initialize GPGME.

226

169

*/

240

183

241

184

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

242

185

if(fd == -1){

243

perror_plus("open");

186

perror("open");

244

187

return false;

245

188

}

246

189

260

203

261

204

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

262

205

if(ret == -1){

263

perror_plus("close");

206

perror("close");

264

207

}

265

208

gpgme_data_release(pgp_data);

266

209

return true;

391

334

392

335

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

393

336

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

394

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

395

338

plaintext_length = -1;

396

339

goto decrypt_end;

397

340

}

402

345

(size_t)plaintext_length,

403

346

plaintext_capacity);

404

347

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

348

perror("incbuffer");

406

349

plaintext_length = -1;

407

350

goto decrypt_end;

408

351

}

415

358

break;

416

359

}

417

360

if(ret < 0){

418

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

419

362

plaintext_length = -1;

420

363

goto decrypt_end;

421

364

}

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

}

796

737

errno = EINTR;

797

738

goto mandos_end;

798

739

}

799

800

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

740

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 has been called */

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 = (sizeof(ifreq_flags)*2)+3; /* "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, "Wait until first server is found. No timeout!\n");

1213

}

1214

ret = avahi_simple_poll_iterate(s, -1);

1215

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1218

}

1219

/* the current time */

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1221

if(ret == -1){

1222

perror_plus("clock_gettime");

1223

return -1;

1224

}

1225

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

1226

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

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

1234

}

1235

1236

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1241

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1243

return 0;

1244

}

1245

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

1246

if(ret == -1){

1247

perror_plus("clock_gettime");

1248

return -1;

1249

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1252

}

1253

1254

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

1255

}

1256

if(ret != 0){

1257

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

1258

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

1259

}

1260

}

1261

}

1262

}

1263

1264

1023

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

1265

1024

AvahiSServiceBrowser *sb = NULL;

1266

1025

int error;

1268

1027

intmax_t tmpmax;

1269

1028

char *tmp;

1270

1029

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

1030

const char *interface = "eth0";

1272

1031

struct ifreq network;

1273

1032

int sd = -1;

1274

1033

bool take_down_interface = false;

1275

1034

uid_t uid;

1276

1035

gid_t gid;

1036

char *connect_to = NULL;

1277

1037

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

1278

1038

bool tempdir_created = false;

1279

1039

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1283

1043

bool gnutls_initialized = false;

1284

1044

bool gpgme_initialized = false;

1285

1045

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1287

1046

1288

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1295

1054

errno = 0;

1296

1055

ret = setgid(gid);

1297

1056

if(ret == -1){

1298

perror_plus("setgid");

1057

perror("setgid");

1299

1058

}

1300

1059

1301

1060

/* Lower user privileges (temporarily) */

1302

1061

errno = 0;

1303

1062

ret = seteuid(uid);

1304

1063

if(ret == -1){

1305

perror_plus("seteuid");

1064

perror("seteuid");

1306

1065

}

1307

1066

1308

1067

if(quit_now){

1343

1102

.arg = "SECONDS",

1344

1103

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

1345

1104

.group = 2 },

1346

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

1347

.arg = "SECONDS",

1348

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

1349

.group = 2 },

1350

1105

/*

1351

1106

* These reproduce what we would get without ARGP_NO_HELP

1352

1107

*/

1396

1151

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

1397

1152

argp_error(state, "Bad delay");

1398

1153

}

1399

case 132: /* --retry */

1400

errno = 0;

1401

retry_interval = strtod(arg, &tmp);

1402

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

1403

or (retry_interval * 1000) > INT_MAX){

1404

argp_error(state, "Bad retry interval");

1405

}

1406

1154

break;

1407

1155

/*

1408

1156

* These reproduce what we would get without ARGP_NO_HELP

1436

1184

case ENOMEM:

1437

1185

default:

1438

1186

errno = ret;

1439

perror_plus("argp_parse");

1187

perror("argp_parse");

1440

1188

exitcode = EX_OSERR;

1441

1189

goto end;

1442

1190

case EINVAL:

1448

1196

if(not debug){

1449

1197

avahi_set_log_function(empty_log);

1450

1198

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

1199

1477

1200

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

1478

1201

from the signal handler */

1488

1211

sigemptyset(&sigterm_action.sa_mask);

1489

1212

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

1490

1213

if(ret == -1){

1491

perror_plus("sigaddset");

1214

perror("sigaddset");

1492

1215

exitcode = EX_OSERR;

1493

1216

goto end;

1494

1217

}

1495

1218

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

1496

1219

if(ret == -1){

1497

perror_plus("sigaddset");

1220

perror("sigaddset");

1498

1221

exitcode = EX_OSERR;

1499

1222

goto end;

1500

1223

}

1501

1224

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

1502

1225

if(ret == -1){

1503

perror_plus("sigaddset");

1226

perror("sigaddset");

1504

1227

exitcode = EX_OSERR;

1505

1228

goto end;

1506

1229

}

1510

1233

*/

1511

1234

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

1512

1235

if(ret == -1){

1513

perror_plus("sigaction");

1236

perror("sigaction");

1514

1237

return EX_OSERR;

1515

1238

}

1516

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1517

1240

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

1518

1241

if(ret == -1){

1519

perror_plus("sigaction");

1242

perror("sigaction");

1520

1243

exitcode = EX_OSERR;

1521

1244

goto end;

1522

1245

}

1523

1246

}

1524

1247

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

1525

1248

if(ret == -1){

1526

perror_plus("sigaction");

1249

perror("sigaction");

1527

1250

return EX_OSERR;

1528

1251

}

1529

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1530

1253

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

1531

1254

if(ret == -1){

1532

perror_plus("sigaction");

1255

perror("sigaction");

1533

1256

exitcode = EX_OSERR;

1534

1257

goto end;

1535

1258

}

1536

1259

}

1537

1260

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

1538

1261

if(ret == -1){

1539

perror_plus("sigaction");

1262

perror("sigaction");

1540

1263

return EX_OSERR;

1541

1264

}

1542

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1543

1266

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

1544

1267

if(ret == -1){

1545

perror_plus("sigaction");

1268

perror("sigaction");

1546

1269

exitcode = EX_OSERR;

1547

1270

goto end;

1548

1271

}

1549

1272

}

1550

1273

1551

1274

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

1552

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

1275

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

1553

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

1277

if(if_index == 0){

1555

1278

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

1565

1288

errno = 0;

1566

1289

ret = seteuid(0);

1567

1290

if(ret == -1){

1568

perror_plus("seteuid");

1291

perror("seteuid");

1569

1292

}

1570

1293

1571

1294

#ifdef __linux__

1575

1298

bool restore_loglevel = true;

1576

1299

if(ret == -1){

1577

1300

restore_loglevel = false;

1578

perror_plus("klogctl");

1301

perror("klogctl");

1579

1302

}

1580

1303

#endif /* __linux__ */

1581

1304

1582

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

1306

if(sd < 0){

1584

perror_plus("socket");

1307

perror("socket");

1585

1308

exitcode = EX_OSERR;

1586

1309

#ifdef __linux__

1587

1310

if(restore_loglevel){

1588

1311

ret = klogctl(7, NULL, 0);

1589

1312

if(ret == -1){

1590

perror_plus("klogctl");

1313

perror("klogctl");

1591

1314

}

1592

1315

}

1593

1316

#endif /* __linux__ */

1595

1318

errno = 0;

1596

1319

ret = seteuid(uid);

1597

1320

if(ret == -1){

1598

perror_plus("seteuid");

1321

perror("seteuid");

1599

1322

}

1600

1323

goto end;

1601

1324

}

1602

1325

strcpy(network.ifr_name, interface);

1603

1326

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

1604

1327

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1328

perror("ioctl SIOCGIFFLAGS");

1606

1329

#ifdef __linux__

1607

1330

if(restore_loglevel){

1608

1331

ret = klogctl(7, NULL, 0);

1609

1332

if(ret == -1){

1610

perror_plus("klogctl");

1333

perror("klogctl");

1611

1334

}

1612

1335

}

1613

1336

#endif /* __linux__ */

1616

1339

errno = 0;

1617

1340

ret = seteuid(uid);

1618

1341

if(ret == -1){

1619

perror_plus("seteuid");

1342

perror("seteuid");

1620

1343

}

1621

1344

goto end;

1622

1345

}

1626

1349

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

1627

1350

if(ret == -1){

1628

1351

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1352

perror("ioctl SIOCSIFFLAGS");

1630

1353

exitcode = EX_OSERR;

1631

1354

#ifdef __linux__

1632

1355

if(restore_loglevel){

1633

1356

ret = klogctl(7, NULL, 0);

1634

1357

if(ret == -1){

1635

perror_plus("klogctl");

1358

perror("klogctl");

1636

1359

}

1637

1360

}

1638

1361

#endif /* __linux__ */

1640

1363

errno = 0;

1641

1364

ret = seteuid(uid);

1642

1365

if(ret == -1){

1643

perror_plus("seteuid");

1366

perror("seteuid");

1644

1367

}

1645

1368

goto end;

1646

1369

}

1647

1370

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1371

/* sleep checking until interface is running */

1649

1372

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

1650

1373

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

1651

1374

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1375

perror("ioctl SIOCGIFFLAGS");

1653

1376

} else if(network.ifr_flags & IFF_RUNNING){

1654

1377

break;

1655

1378

}

1656

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

1380

ret = nanosleep(&sleeptime, NULL);

1658

1381

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

1659

perror_plus("nanosleep");

1382

perror("nanosleep");

1660

1383

}

1661

1384

}

1662

1385

if(not take_down_interface){

1663

1386

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

1664

1387

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

1665

1388

if(ret == -1){

1666

perror_plus("close");

1389

perror("close");

1667

1390

}

1668

1391

}

1669

1392

#ifdef __linux__

1671

1394

/* Restores kernel loglevel to default */

1672

1395

ret = klogctl(7, NULL, 0);

1673

1396

if(ret == -1){

1674

perror_plus("klogctl");

1397

perror("klogctl");

1675

1398

}

1676

1399

}

1677

1400

#endif /* __linux__ */

1681

1404

/* Lower privileges */

1682

1405

ret = seteuid(uid);

1683

1406

if(ret == -1){

1684

perror_plus("seteuid");

1407

perror("seteuid");

1685

1408

}

1686

1409

} else {

1687

1410

/* Lower privileges permanently */

1688

1411

ret = setuid(uid);

1689

1412

if(ret == -1){

1690

perror_plus("setuid");

1413

perror("setuid");

1691

1414

}

1692

1415

}

1693

1416

}

1709

1432

goto end;

1710

1433

}

1711

1434

1435

tempdir_created = true;

1712

1436

if(mkdtemp(tempdir) == NULL){

1713

perror_plus("mkdtemp");

1437

tempdir_created = false;

1438

perror("mkdtemp");

1714

1439

goto end;

1715

1440

}

1716

tempdir_created = true;

1717

1441

1718

1442

if(quit_now){

1719

1443

goto end;

1773

1497

if(quit_now){

1774

1498

goto end;

1775

1499

}

1776

1777

while(not quit_now){

1778

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

1779

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;

1780

1520

break;

1781

1521

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

1522

} else {

1786

1523

exitcode = EXIT_SUCCESS;

1787

1524

}

1788

1789

1525

goto end;

1790

1526

}

1791

1527

1843

1579

if(debug){

1844

1580

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

1845

1581

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

1848

if(debug){

1849

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

1850

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

1851

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

1852

1584

1853

1585

end:

1854

1586

1875

1607

if(gpgme_initialized){

1876

1608

gpgme_release(mc.ctx);

1877

1609

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

1880

if(mc.current_server != NULL){

1881

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

1882

while(mc.current_server != NULL){

1883

server *next = mc.current_server->next;

1884

free(mc.current_server);

1885

mc.current_server = next;

1886

}

1887

}

1888

1610

1889

1611

/* Take down the network interface */

1890

1612

if(take_down_interface){

1892

1614

errno = 0;

1893

1615

ret = seteuid(0);

1894

1616

if(ret == -1){

1895

perror_plus("seteuid");

1617

perror("seteuid");

1896

1618

}

1897

1619

if(geteuid() == 0){

1898

1620

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

1899

1621

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1622

perror("ioctl SIOCGIFFLAGS");

1901

1623

} else if(network.ifr_flags & IFF_UP) {

1902

1624

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

1903

1625

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

1904

1626

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1627

perror("ioctl SIOCSIFFLAGS");

1906

1628

}

1907

1629

}

1908

1630

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

1909

1631

if(ret == -1){

1910

perror_plus("close");

1632

perror("close");

1911

1633

}

1912

1634

/* Lower privileges permanently */

1913

1635

errno = 0;

1914

1636

ret = setuid(uid);

1915

1637

if(ret == -1){

1916

perror_plus("setuid");

1638

perror("setuid");

1917

1639

}

1918

1640

}

1919

1641

}

1920

1642

1921

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

1643

/* Removes the temp directory used by GPGME */

1922

1644

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

1928

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

}

1929

1665

char *fullname = NULL;

1930

1666

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

1931

1667

direntry->d_name);

1932

1668

if(ret < 0){

1933

perror_plus("asprintf");

1669

perror("asprintf");

1934

1670

continue;

1935

1671

}

1936

1672

ret = remove(fullname);

1940

1676

}

1941

1677

free(fullname);

1942

1678

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1679

closedir(d);

1949

1680

}

1950

1681

ret = rmdir(tempdir);

1951

1682

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

1952

perror_plus("rmdir");

1683

perror("rmdir");

1953

1684

}

1954

1685

}

1955

1686

1960

1691

&old_sigterm_action,

1961

1692

NULL));

1962

1693

if(ret == -1){

1963

perror_plus("sigaction");

1694

perror("sigaction");

1964

1695

}

1965

1696

do {

1966

1697

ret = raise(signal_received);

1967

1698

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

1968

1699

if(ret != 0){

1969

perror_plus("raise");

1700

perror("raise");

1970

1701

abort();

1971

1702

}

1972

1703

TEMP_FAILURE_RETRY(pause());