/mandos/trunk : revision 505.2.4

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

122

123

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

123

124

#define SECKEY "seckey.txt"

124

125

#define PUBKEY "pubkey.txt"

126

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

125

127

126

128

bool debug = false;

127

129

static const char mandos_protocol_version[] = "1";

128

130

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

129

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

131

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

132

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

133

char *connect_to = NULL;

134

135

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

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

130

145

131

146

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

132

147

typedef struct {

137

152

gnutls_dh_params_t dh_params;

138

153

const char *priority;

139

154

gpgme_ctx_t ctx;

155

server *current_server;

140

156

} mandos_context;

141

157

142

158

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

143

159

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

144

160

.dh_bits = 1024, .priority = "SECURE256"

145

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

161

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

162

.current_server = NULL };

146

163

147

164

sig_atomic_t quit_now = 0;

148

165

int signal_received = 0;

149

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

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

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

174

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

175

va_list ap;

176

va_start (ap, format);

177

178

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

179

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

180

}

181

150

182

/*

151

183

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

152

184

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

164

196

return buffer_capacity;

165

197

}

166

198

199

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

203

int ret;

204

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

205

if(new_server == NULL){

206

perror_plus("malloc");

207

return -1;

208

}

209

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

210

.port = port,

211

.if_index = if_index,

212

.af = af };

213

if(new_server->ip == NULL){

214

perror_plus("strdup");

215

return -1;

216

}

217

/* Special case of first server */

218

if (mc.current_server == NULL){

219

new_server->next = new_server;

220

new_server->prev = new_server;

221

mc.current_server = new_server;

222

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

223

} else {

224

new_server->next = mc.current_server;

225

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

226

new_server->prev->next = new_server;

227

mc.current_server->prev = new_server;

228

}

229

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

230

if(ret == -1){

231

perror_plus("clock_gettime");

232

return -1;

233

}

234

return 0;

235

}

236

167

237

/*

168

238

* Initialize GPGME.

169

239

*/

183

253

184

254

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

185

255

if(fd == -1){

186

perror("open");

256

perror_plus("open");

187

257

return false;

188

258

}

189

259

203

273

204

274

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

205

275

if(ret == -1){

206

perror("close");

276

perror_plus("close");

207

277

}

208

278

gpgme_data_release(pgp_data);

209

279

return true;

222

292

return false;

223

293

}

224

294

225

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

295

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

226

296

rc = gpgme_get_engine_info(&engine_info);

227

297

if(rc != GPG_ERR_NO_ERROR){

228

298

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

334

404

335

405

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

336

406

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

337

perror("gpgme_data_seek");

407

perror_plus("gpgme_data_seek");

338

408

plaintext_length = -1;

339

409

goto decrypt_end;

340

410

}

345

415

(size_t)plaintext_length,

346

416

plaintext_capacity);

347

417

if(plaintext_capacity == 0){

348

perror("incbuffer");

418

perror_plus("incbuffer");

349

419

plaintext_length = -1;

350

420

goto decrypt_end;

351

421

}

358

428

break;

359

429

}

360

430

if(ret < 0){

361

perror("gpgme_data_read");

431

perror_plus("gpgme_data_read");

362

432

plaintext_length = -1;

363

433

goto decrypt_end;

364

434

}

421

491

}

422

492

423

493

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

425

495

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

496

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

430

497

safer_gnutls_strerror(ret));

431

498

gnutls_global_deinit();

432

499

return -1;

587

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

655

if(tcp_sd < 0){

589

656

int e = errno;

590

perror("socket");

657

perror_plus("socket");

591

658

errno = e;

592

659

goto mandos_end;

593

660

}

607

674

}

608

675

if(ret < 0 ){

609

676

int e = errno;

610

perror("inet_pton");

677

perror_plus("inet_pton");

611

678

errno = e;

612

679

goto mandos_end;

613

680

}

649

716

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

650

717

char interface[IF_NAMESIZE];

651

718

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

652

perror("if_indextoname");

719

perror_plus("if_indextoname");

653

720

} else {

654

721

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

655

722

ip, interface, port);

669

736

sizeof(addrstr));

670

737

}

671

738

if(pcret == NULL){

672

perror("inet_ntop");

739

perror_plus("inet_ntop");

673

740

} else {

674

741

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

675

742

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

688

755

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

689

756

}

690

757

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

758

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

759

int e = errno;

760

perror_plus("connect");

761

errno = e;

762

}

694

763

goto mandos_end;

695

764

}

696

765

707

776

out_size - written));

708

777

if(ret == -1){

709

778

int e = errno;

710

perror("write");

779

perror_plus("write");

711

780

errno = e;

712

781

goto mandos_end;

713

782

}

738

807

goto mandos_end;

739

808

}

740

809

810

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

741

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

812

743

813

if(quit_now){

780

850

buffer_capacity);

781

851

if(buffer_capacity == 0){

782

852

int e = errno;

783

perror("incbuffer");

853

perror_plus("incbuffer");

784

854

errno = e;

785

855

goto mandos_end;

786

856

}

891

961

if(e == 0){

892

962

e = errno;

893

963

}

894

perror("close");

964

perror_plus("close");

895

965

}

896

966

gnutls_deinit(session);

967

errno = e;

897

968

if(quit_now){

898

e = EINTR;

969

errno = EINTR;

899

970

retval = -1;

900

971

}

901

errno = e;

902

972

}

903

973

return retval;

904

974

}

947

1017

avahi_proto_to_af(proto));

948

1018

if(ret == 0){

949

1019

avahi_simple_poll_quit(mc.simple_poll);

1020

} else {

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

950

1023

}

951

1024

}

952

1025

}

1006

1079

}

1007

1080

}

1008

1081

1009

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

1082

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

1010

1083

static void handle_sigterm(int sig){

1011

1084

if(quit_now){

1012

1085

return;

1014

1087

quit_now = 1;

1015

1088

signal_received = sig;

1016

1089

int old_errno = errno;

1090

/* set main loop to exit */

1017

1091

if(mc.simple_poll != NULL){

1018

1092

avahi_simple_poll_quit(mc.simple_poll);

1019

1093

}

1020

1094

errno = old_errno;

1021

1095

}

1022

1096

1097

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

1098

int ret;

1099

1100

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

1101

if(s < 0){

1102

perror_plus("socket");

1103

return false;

1104

}

1105

strcpy(ifr->ifr_name, ifname);

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1107

if(ret == -1){

1108

if(debug){

1109

perror_plus("ioctl SIOCGIFFLAGS");

1110

}

1111

return false;

1112

}

1113

return true;

1114

}

1115

1116

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

1117

1118

/* Reject the loopback device */

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return false;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return true;

1133

}

1134

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

1135

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

1136

if(debug){

1137

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

1138

ifname);

1139

}

1140

return false;

1141

}

1142

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

1143

if(ifr->ifr_flags & IFF_NOARP){

1144

if(debug){

1145

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

1146

}

1147

return false;

1148

}

1149

1150

/* Accept this device */

1151

if(debug){

1152

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

1153

}

1154

return true;

1155

}

1156

1157

/*

1158

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

1159

* corresponds to an acceptable network device.

1160

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

1161

*/

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

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

1165

return 0;

1166

}

1167

struct ifreq ifr;

1168

1169

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

1170

return 0;

1171

}

1172

1173

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

1174

return 0;

1175

}

1176

return 1;

1177

}

1178

1179

/*

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1183

*/

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

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

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

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

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

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

1204

/* read line from flags_fd */

1205

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

1206

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

1207

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

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

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

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

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

1232

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

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

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

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1286

}

1287

return 1;

1288

}

1289

1290

int notdotentries(const struct dirent *direntry){

1291

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

1292

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

1293

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

1294

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

1295

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

1296

return 0;

1297

}

1298

return 1;

1299

}

1300

1301

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

1302

int runnable_hook(const struct dirent *direntry){

1303

int ret;

1304

struct stat st;

1305

1306

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

1307

/* Empty name? */

1308

return 0;

1309

}

1310

1311

/* Save pointer to last character */

1312

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

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

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

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

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

1328

if(ret == -1){

1329

if(debug){

1330

perror_plus("Could not stat plugin");

1331

}

1332

return 0;

1333

}

1334

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

1335

/* Not a regular file */

1336

return 0;

1337

}

1338

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

1339

/* Not executable */

1340

return 0;

1341

}

1342

return 1;

1343

}

1344

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1346

int ret;

1347

struct timespec now;

1348

struct timespec waited_time;

1349

intmax_t block_time;

1350

1351

while(true){

1352

if(mc.current_server == NULL){

1353

if (debug){

1354

fprintf(stderr,

1355

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

1356

}

1357

ret = avahi_simple_poll_iterate(s, -1);

1358

} else {

1359

if (debug){

1360

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

1361

" or wait\n");

1362

}

1363

/* the current time */

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

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

1370

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

1371

waited_time.tv_sec = (now.tv_sec

1372

- mc.current_server->last_seen.tv_sec);

1373

waited_time.tv_nsec = (now.tv_nsec

1374

- mc.current_server->last_seen.tv_nsec);

1375

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

1376

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

1377

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

1378

block_time = ((retry_interval

1379

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

1380

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

1381

1382

if (debug){

1383

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

1384

}

1385

1386

if(block_time <= 0){

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1391

if(ret == 0){

1392

avahi_simple_poll_quit(mc.simple_poll);

1393

return 0;

1394

}

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1396

&mc.current_server->last_seen);

1397

if(ret == -1){

1398

perror_plus("clock_gettime");

1399

return -1;

1400

}

1401

mc.current_server = mc.current_server->next;

1402

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

1403

servers, but don't block */

1404

}

1405

1406

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

1407

}

1408

if(ret != 0){

1409

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

1410

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

1411

}

1412

}

1413

}

1414

}

1415

1023

1416

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

1024

1417

AvahiSServiceBrowser *sb = NULL;

1025

1418

int error;

1027

1420

intmax_t tmpmax;

1028

1421

char *tmp;

1029

1422

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1423

const char *interface = "";

1031

1424

struct ifreq network;

1032

1425

int sd = -1;

1033

1426

bool take_down_interface = false;

1034

1427

uid_t uid;

1035

1428

gid_t gid;

1036

char *connect_to = NULL;

1037

1429

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

1038

1430

bool tempdir_created = false;

1039

1431

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1043

1435

bool gnutls_initialized = false;

1044

1436

bool gpgme_initialized = false;

1045

1437

float delay = 2.5f;

1438

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

1439

retrying the same server again */

1046

1440

1047

1441

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

1442

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

1448

errno = 0;

1055

1449

ret = setgid(gid);

1056

1450

if(ret == -1){

1057

perror("setgid");

1451

perror_plus("setgid");

1058

1452

}

1059

1453

1060

1454

/* Lower user privileges (temporarily) */

1061

1455

errno = 0;

1062

1456

ret = seteuid(uid);

1063

1457

if(ret == -1){

1064

perror("seteuid");

1458

perror_plus("seteuid");

1065

1459

}

1066

1460

1067

1461

if(quit_now){

1102

1496

.arg = "SECONDS",

1103

1497

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

1104

1498

.group = 2 },

1499

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

1500

.arg = "SECONDS",

1501

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

1502

.group = 2 },

1105

1503

/*

1106

1504

* These reproduce what we would get without ARGP_NO_HELP

1107

1505

*/

1151

1549

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

1152

1550

argp_error(state, "Bad delay");

1153

1551

}

1552

case 132: /* --retry */

1553

errno = 0;

1554

retry_interval = strtod(arg, &tmp);

1555

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

1556

or (retry_interval * 1000) > INT_MAX

1557

or retry_interval < 0){

1558

argp_error(state, "Bad retry interval");

1559

}

1154

1560

break;

1155

1561

/*

1156

1562

* These reproduce what we would get without ARGP_NO_HELP

1184

1590

case ENOMEM:

1185

1591

default:

1186

1592

errno = ret;

1187

perror("argp_parse");

1593

perror_plus("argp_parse");

1188

1594

exitcode = EX_OSERR;

1189

1595

goto end;

1190

1596

case EINVAL:

1192

1598

goto end;

1193

1599

}

1194

1600

}

1601

1602

{

1603

/* Work around Debian bug #633582:

1604

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

1605

struct stat st;

1606

1607

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

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

1687

/* setenv( XXX more here */

1688

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

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1693

goto end;

1694

}

1695

}

1696

close(devnull);

1697

}

1195

1698

1196

1699

if(not debug){

1197

1700

avahi_set_log_function(empty_log);

1198

1701

}

1199

1702

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

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

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

1200

1728

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

1201

1729

from the signal handler */

1202

1730

/* Initialize the pseudo-RNG for Avahi */

1211

1739

sigemptyset(&sigterm_action.sa_mask);

1212

1740

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

1213

1741

if(ret == -1){

1214

perror("sigaddset");

1742

perror_plus("sigaddset");

1215

1743

exitcode = EX_OSERR;

1216

1744

goto end;

1217

1745

}

1218

1746

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

1219

1747

if(ret == -1){

1220

perror("sigaddset");

1748

perror_plus("sigaddset");

1221

1749

exitcode = EX_OSERR;

1222

1750

goto end;

1223

1751

}

1224

1752

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

1225

1753

if(ret == -1){

1226

perror("sigaddset");

1754

perror_plus("sigaddset");

1227

1755

exitcode = EX_OSERR;

1228

1756

goto end;

1229

1757

}

1233

1761

*/

1234

1762

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

1235

1763

if(ret == -1){

1236

perror("sigaction");

1764

perror_plus("sigaction");

1237

1765

return EX_OSERR;

1238

1766

}

1239

1767

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1768

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

1241

1769

if(ret == -1){

1242

perror("sigaction");

1770

perror_plus("sigaction");

1243

1771

exitcode = EX_OSERR;

1244

1772

goto end;

1245

1773

}

1246

1774

}

1247

1775

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

1248

1776

if(ret == -1){

1249

perror("sigaction");

1777

perror_plus("sigaction");

1250

1778

return EX_OSERR;

1251

1779

}

1252

1780

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1781

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

1254

1782

if(ret == -1){

1255

perror("sigaction");

1783

perror_plus("sigaction");

1256

1784

exitcode = EX_OSERR;

1257

1785

goto end;

1258

1786

}

1259

1787

}

1260

1788

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

1261

1789

if(ret == -1){

1262

perror("sigaction");

1790

perror_plus("sigaction");

1263

1791

return EX_OSERR;

1264

1792

}

1265

1793

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1794

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

1267

1795

if(ret == -1){

1268

perror("sigaction");

1796

perror_plus("sigaction");

1269

1797

exitcode = EX_OSERR;

1270

1798

goto end;

1271

1799

}

1272

1800

}

1273

1801

1274

1802

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

1275

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

1803

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

1276

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1805

if(if_index == 0){

1278

1806

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

1288

1816

errno = 0;

1289

1817

ret = seteuid(0);

1290

1818

if(ret == -1){

1291

perror("seteuid");

1819

perror_plus("seteuid");

1292

1820

}

1293

1821

1294

1822

#ifdef __linux__

1298

1826

bool restore_loglevel = true;

1299

1827

if(ret == -1){

1300

1828

restore_loglevel = false;

1301

perror("klogctl");

1829

perror_plus("klogctl");

1302

1830

}

1303

1831

#endif /* __linux__ */

1304

1832

1305

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1834

if(sd < 0){

1307

perror("socket");

1835

perror_plus("socket");

1308

1836

exitcode = EX_OSERR;

1309

1837

#ifdef __linux__

1310

1838

if(restore_loglevel){

1311

1839

ret = klogctl(7, NULL, 0);

1312

1840

if(ret == -1){

1313

perror("klogctl");

1841

perror_plus("klogctl");

1314

1842

}

1315

1843

}

1316

1844

#endif /* __linux__ */

1318

1846

errno = 0;

1319

1847

ret = seteuid(uid);

1320

1848

if(ret == -1){

1321

perror("seteuid");

1849

perror_plus("seteuid");

1322

1850

}

1323

1851

goto end;

1324

1852

}

1325

1853

strcpy(network.ifr_name, interface);

1326

1854

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

1327

1855

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1856

perror_plus("ioctl SIOCGIFFLAGS");

1329

1857

#ifdef __linux__

1330

1858

if(restore_loglevel){

1331

1859

ret = klogctl(7, NULL, 0);

1332

1860

if(ret == -1){

1333

perror("klogctl");

1861

perror_plus("klogctl");

1334

1862

}

1335

1863

}

1336

1864

#endif /* __linux__ */

1339

1867

errno = 0;

1340

1868

ret = seteuid(uid);

1341

1869

if(ret == -1){

1342

perror("seteuid");

1870

perror_plus("seteuid");

1343

1871

}

1344

1872

goto end;

1345

1873

}

1349

1877

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

1350

1878

if(ret == -1){

1351

1879

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1353

1881

exitcode = EX_OSERR;

1354

1882

#ifdef __linux__

1355

1883

if(restore_loglevel){

1356

1884

ret = klogctl(7, NULL, 0);

1357

1885

if(ret == -1){

1358

perror("klogctl");

1886

perror_plus("klogctl");

1359

1887

}

1360

1888

}

1361

1889

#endif /* __linux__ */

1363

1891

errno = 0;

1364

1892

ret = seteuid(uid);

1365

1893

if(ret == -1){

1366

perror("seteuid");

1894

perror_plus("seteuid");

1367

1895

}

1368

1896

goto end;

1369

1897

}

1370

1898

}

1371

/* sleep checking until interface is running */

1899

/* Sleep checking until interface is running.

1900

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

1372

1901

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

1373

1902

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

1374

1903

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1904

perror_plus("ioctl SIOCGIFFLAGS");

1376

1905

} else if(network.ifr_flags & IFF_RUNNING){

1377

1906

break;

1378

1907

}

1379

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

1909

ret = nanosleep(&sleeptime, NULL);

1381

1910

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

1382

perror("nanosleep");

1911

perror_plus("nanosleep");

1383

1912

}

1384

1913

}

1385

1914

if(not take_down_interface){

1386

1915

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

1387

1916

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

1388

1917

if(ret == -1){

1389

perror("close");

1918

perror_plus("close");

1390

1919

}

1391

1920

}

1392

1921

#ifdef __linux__

1394

1923

/* Restores kernel loglevel to default */

1395

1924

ret = klogctl(7, NULL, 0);

1396

1925

if(ret == -1){

1397

perror("klogctl");

1926

perror_plus("klogctl");

1398

1927

}

1399

1928

}

1400

1929

#endif /* __linux__ */

1404

1933

/* Lower privileges */

1405

1934

ret = seteuid(uid);

1406

1935

if(ret == -1){

1407

perror("seteuid");

1936

perror_plus("seteuid");

1408

1937

}

1409

1938

} else {

1410

1939

/* Lower privileges permanently */

1411

1940

ret = setuid(uid);

1412

1941

if(ret == -1){

1413

perror("setuid");

1942

perror_plus("setuid");

1414

1943

}

1415

1944

}

1416

1945

}

1432

1961

goto end;

1433

1962

}

1434

1963

1964

if(mkdtemp(tempdir) == NULL){

1965

perror_plus("mkdtemp");

1966

goto end;

1967

}

1435

1968

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

1439

goto end;

1440

}

1441

1969

1442

1970

if(quit_now){

1443

1971

goto end;

1485

2013

1486

2014

port = (uint16_t)tmpmax;

1487

2015

*address = '\0';

1488

address = connect_to;

1489

2016

/* Colon in address indicates IPv6 */

1490

2017

int af;

1491

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

2018

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

1492

2019

af = AF_INET6;

2020

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

2021

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

2022

{

2023

connect_to++;

2024

address[-1] = '\0';

2025

}

1493

2026

} else {

1494

2027

af = AF_INET;

1495

2028

}

2029

address = connect_to;

1496

2030

1497

2031

if(quit_now){

1498

2032

goto end;

1499

2033

}

1500

2034

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 {

2035

while(not quit_now){

2036

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

2037

if(quit_now or ret == 0){

2038

break;

2039

}

2040

if(debug){

2041

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

2042

(int)retry_interval);

2043

}

2044

sleep((int)retry_interval);

2045

}

2046

2047

if (not quit_now){

1523

2048

exitcode = EXIT_SUCCESS;

1524

2049

}

2050

1525

2051

goto end;

1526

2052

}

1527

2053

1579

2105

if(debug){

1580

2106

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

1581

2107

}

1582

1583

avahi_simple_poll_loop(mc.simple_poll);

2108

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2111

if(debug){

2112

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

2113

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

2114

}

1584

2115

1585

2116

end:

1586

2117

1607

2138

if(gpgme_initialized){

1608

2139

gpgme_release(mc.ctx);

1609

2140

}

2141

2142

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

2143

has seen */

2144

if(mc.current_server != NULL){

2145

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

2146

while(mc.current_server != NULL){

2147

server *next = mc.current_server->next;

2148

free(mc.current_server);

2149

mc.current_server = next;

2150

}

2151

}

2152

2153

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

1610

2154

1611

2155

/* Take down the network interface */

1612

2156

if(take_down_interface){

1614

2158

errno = 0;

1615

2159

ret = seteuid(0);

1616

2160

if(ret == -1){

1617

perror("seteuid");

2161

perror_plus("seteuid");

1618

2162

}

1619

2163

if(geteuid() == 0){

1620

2164

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

1621

2165

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

2166

perror_plus("ioctl SIOCGIFFLAGS");

1623

2167

} else if(network.ifr_flags & IFF_UP) {

1624

2168

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

1625

2169

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

1626

2170

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1628

2172

}

1629

2173

}

1630

2174

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

1631

2175

if(ret == -1){

1632

perror("close");

2176

perror_plus("close");

1633

2177

}

1634

2178

/* Lower privileges permanently */

1635

2179

errno = 0;

1636

2180

ret = setuid(uid);

1637

2181

if(ret == -1){

1638

perror("setuid");

2182

perror_plus("setuid");

1639

2183

}

1640

2184

}

1641

2185

}

1642

2186

1643

/* Removes the temp directory used by GPGME */

2187

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

1644

2188

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

2189

struct dirent **direntries = NULL;

2190

struct dirent *direntry = NULL;

2191

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

2192

alphasort);

2193

if (numentries > 0){

2194

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

2195

direntry = direntries[i];

1665

2196

char *fullname = NULL;

1666

2197

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

1667

2198

direntry->d_name);

1668

2199

if(ret < 0){

1669

perror("asprintf");

2200

perror_plus("asprintf");

1670

2201

continue;

1671

2202

}

1672

2203

ret = remove(fullname);

1676

2207

}

1677

2208

free(fullname);

1678

2209

}

1679

closedir(d);

2210

}

2211

2212

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

2213

free(direntries);

2214

if (numentries == -1){

2215

perror_plus("scandir");

1680

2216

}

1681

2217

ret = rmdir(tempdir);

1682

2218

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

1683

perror("rmdir");

2219

perror_plus("rmdir");

1684

2220

}

1685

2221

}

1686

2222

1691

2227

&old_sigterm_action,

1692

2228

NULL));

1693

2229

if(ret == -1){

1694

perror("sigaction");

2230

perror_plus("sigaction");

1695

2231

}

1696

2232

do {

1697

2233

ret = raise(signal_received);

1698

2234

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

1699

2235

if(ret != 0){

1700

perror("raise");

2236

perror_plus("raise");

1701

2237

abort();

1702

2238

}

1703

2239

TEMP_FAILURE_RETRY(pause());