/mandos/trunk : revision 505.2.3

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

62

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

63

strtoimax() */

64

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

65

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

65

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

66

program_invocation_short_name */

66

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

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>";

130

132

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

131

133

char *connect_to = NULL;

132

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;

145

133

146

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

134

147

typedef struct {

135

148

AvahiSimplePoll *simple_poll;

139

152

gnutls_dh_params_t dh_params;

140

153

const char *priority;

141

154

gpgme_ctx_t ctx;

155

server *current_server;

142

156

} mandos_context;

143

157

144

158

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

145

159

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

146

160

.dh_bits = 1024, .priority = "SECURE256"

147

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

161

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

162

.current_server = NULL };

148

163

149

164

sig_atomic_t quit_now = 0;

150

165

int signal_received = 0;

151

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

152

174

/*

153

175

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

154

176

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

166

188

return buffer_capacity;

167

189

}

168

190

191

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

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

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

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

215

} else {

216

new_server->next = mc.current_server;

217

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

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

169

229

/*

170

230

* Initialize GPGME.

171

231

*/

185

245

186

246

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

187

247

if(fd == -1){

188

perror("open");

248

perror_plus("open");

189

249

return false;

190

250

}

191

251

205

265

206

266

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

207

267

if(ret == -1){

208

perror("close");

268

perror_plus("close");

209

269

}

210

270

gpgme_data_release(pgp_data);

211

271

return true;

224

284

return false;

225

285

}

226

286

227

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

287

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

228

288

rc = gpgme_get_engine_info(&engine_info);

229

289

if(rc != GPG_ERR_NO_ERROR){

230

290

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

336

396

337

397

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

338

398

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

339

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

340

400

plaintext_length = -1;

341

401

goto decrypt_end;

342

402

}

347

407

(size_t)plaintext_length,

348

408

plaintext_capacity);

349

409

if(plaintext_capacity == 0){

350

perror("incbuffer");

410

perror_plus("incbuffer");

351

411

plaintext_length = -1;

352

412

goto decrypt_end;

353

413

}

360

420

break;

361

421

}

362

422

if(ret < 0){

363

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

364

424

plaintext_length = -1;

365

425

goto decrypt_end;

366

426

}

423

483

}

424

484

425

485

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

487

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

488

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

432

489

safer_gnutls_strerror(ret));

433

490

gnutls_global_deinit();

434

491

return -1;

589

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

647

if(tcp_sd < 0){

591

648

int e = errno;

592

perror("socket");

649

perror_plus("socket");

593

650

errno = e;

594

651

goto mandos_end;

595

652

}

609

666

}

610

667

if(ret < 0 ){

611

668

int e = errno;

612

perror("inet_pton");

669

perror_plus("inet_pton");

613

670

errno = e;

614

671

goto mandos_end;

615

672

}

651

708

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

652

709

char interface[IF_NAMESIZE];

653

710

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

654

perror("if_indextoname");

711

perror_plus("if_indextoname");

655

712

} else {

656

713

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

657

714

ip, interface, port);

671

728

sizeof(addrstr));

672

729

}

673

730

if(pcret == NULL){

674

perror("inet_ntop");

731

perror_plus("inet_ntop");

675

732

} else {

676

733

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

677

734

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

692

749

if(ret < 0){

693

750

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

694

751

int e = errno;

695

perror("connect");

752

perror_plus("connect");

696

753

errno = e;

697

754

}

698

755

goto mandos_end;

711

768

out_size - written));

712

769

if(ret == -1){

713

770

int e = errno;

714

perror("write");

771

perror_plus("write");

715

772

errno = e;

716

773

goto mandos_end;

717

774

}

742

799

goto mandos_end;

743

800

}

744

801

802

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

745

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

804

747

805

if(quit_now){

784

842

buffer_capacity);

785

843

if(buffer_capacity == 0){

786

844

int e = errno;

787

perror("incbuffer");

845

perror_plus("incbuffer");

788

846

errno = e;

789

847

goto mandos_end;

790

848

}

895

953

if(e == 0){

896

954

e = errno;

897

955

}

898

perror("close");

956

perror_plus("close");

899

957

}

900

958

gnutls_deinit(session);

959

errno = e;

901

960

if(quit_now){

902

e = EINTR;

961

errno = EINTR;

903

962

retval = -1;

904

963

}

905

errno = e;

906

964

}

907

965

return retval;

908

966

}

951

1009

avahi_proto_to_af(proto));

952

1010

if(ret == 0){

953

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

954

1015

}

955

1016

}

956

1017

}

1010

1071

}

1011

1072

}

1012

1073

1013

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

1074

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

1014

1075

static void handle_sigterm(int sig){

1015

1076

if(quit_now){

1016

1077

return;

1018

1079

quit_now = 1;

1019

1080

signal_received = sig;

1020

1081

int old_errno = errno;

1082

/* set main loop to exit */

1021

1083

if(mc.simple_poll != NULL){

1022

1084

avahi_simple_poll_quit(mc.simple_poll);

1023

1085

}

1024

1086

errno = old_errno;

1025

1087

}

1026

1088

1089

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

1090

int ret;

1091

1092

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

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

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

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

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

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1027

1149

/*

1028

1150

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

1029

1151

* corresponds to an acceptable network device.

1030

1152

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

1031

1153

*/

1032

1154

int good_interface(const struct dirent *if_entry){

1155

int ret;

1156

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

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

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

1162

return 0;

1163

}

1164

1165

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

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1033

1177

ssize_t ssret;

1034

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1035

1182

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

1036

1183

if_entry->d_name);

1037

1184

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1185

perror_plus("asprintf");

1042

1186

return 0;

1043

1187

}

1044

1188

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

1045

1189

if(flags_fd == -1){

1046

perror("open");

1190

perror_plus("open");

1191

free(flagname);

1047

1192

return 0;

1048

1193

}

1194

free(flagname);

1049

1195

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

1050

1196

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1197

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

1052

1198

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

1053

1199

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

1054

1200

if(flagstring == NULL){

1055

perror("malloc");

1201

perror_plus("malloc");

1056

1202

close(flags_fd);

1057

1203

return 0;

1058

1204

}

1060

1206

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

1061

1207

(size_t)to_read));

1062

1208

if(ssret == -1){

1063

perror("read");

1209

perror_plus("read");

1064

1210

free(flagstring);

1065

1211

close(flags_fd);

1066

1212

return 0;

1095

1241

}

1096

1242

return 0;

1097

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1098

1250

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

1099

1251

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

1100

1252

if(debug){

1111

1263

}

1112

1264

return 0;

1113

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1114

1274

/* Accept this device */

1115

1275

if(debug){

1116

1276

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

1119

1279

return 1;

1120

1280

}

1121

1281

1282

int notdotentries(const struct dirent *direntry){

1283

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

1284

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

1285

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

1286

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

1287

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

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

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

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

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

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

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

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

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

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

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

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

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

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

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

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

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

1362

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

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

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

1368

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

1369

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

1370

block_time = ((retry_interval

1371

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

1372

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

1373

1374

if (debug){

1375

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

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

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

1395

servers, but don't block */

1396

}

1397

1398

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

1399

}

1400

if(ret != 0){

1401

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

1402

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

1403

}

1404

}

1405

}

1406

}

1407

1122

1408

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

1123

1409

AvahiSServiceBrowser *sb = NULL;

1124

1410

int error;

1141

1427

bool gnutls_initialized = false;

1142

1428

bool gpgme_initialized = false;

1143

1429

float delay = 2.5f;

1430

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

1431

retrying the same server again */

1144

1432

1145

1433

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1434

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1440

errno = 0;

1153

1441

ret = setgid(gid);

1154

1442

if(ret == -1){

1155

perror("setgid");

1443

perror_plus("setgid");

1156

1444

}

1157

1445

1158

1446

/* Lower user privileges (temporarily) */

1159

1447

errno = 0;

1160

1448

ret = seteuid(uid);

1161

1449

if(ret == -1){

1162

perror("seteuid");

1450

perror_plus("seteuid");

1163

1451

}

1164

1452

1165

1453

if(quit_now){

1200

1488

.arg = "SECONDS",

1201

1489

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

1202

1490

.group = 2 },

1491

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

1492

.arg = "SECONDS",

1493

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

1494

.group = 2 },

1203

1495

/*

1204

1496

* These reproduce what we would get without ARGP_NO_HELP

1205

1497

*/

1249

1541

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

1250

1542

argp_error(state, "Bad delay");

1251

1543

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

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

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

1551

}

1252

1552

break;

1253

1553

/*

1254

1554

* These reproduce what we would get without ARGP_NO_HELP

1282

1582

case ENOMEM:

1283

1583

default:

1284

1584

errno = ret;

1285

perror("argp_parse");

1585

perror_plus("argp_parse");

1286

1586

exitcode = EX_OSERR;

1287

1587

goto end;

1288

1588

case EINVAL:

1290

1590

goto end;

1291

1591

}

1292

1592

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

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

1678

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

1679

/* setenv( XXX more here */

1680

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

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1689

}

1293

1690

1294

1691

if(not debug){

1295

1692

avahi_set_log_function(empty_log);

1296

1693

}

1297

1694

1298

1695

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

1299

1696

struct dirent **direntries;

1300

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1306

1703

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

1307

1704

}

1308

1705

if(interface == NULL){

1309

perror("malloc");

1706

perror_plus("malloc");

1310

1707

free(direntries);

1311

1708

exitcode = EXIT_FAILURE;

1312

1709

goto end;

1334

1731

sigemptyset(&sigterm_action.sa_mask);

1335

1732

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

1336

1733

if(ret == -1){

1337

perror("sigaddset");

1734

perror_plus("sigaddset");

1338

1735

exitcode = EX_OSERR;

1339

1736

goto end;

1340

1737

}

1341

1738

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

1342

1739

if(ret == -1){

1343

perror("sigaddset");

1740

perror_plus("sigaddset");

1344

1741

exitcode = EX_OSERR;

1345

1742

goto end;

1346

1743

}

1347

1744

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

1348

1745

if(ret == -1){

1349

perror("sigaddset");

1746

perror_plus("sigaddset");

1350

1747

exitcode = EX_OSERR;

1351

1748

goto end;

1352

1749

}

1356

1753

*/

1357

1754

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

1358

1755

if(ret == -1){

1359

perror("sigaction");

1756

perror_plus("sigaction");

1360

1757

return EX_OSERR;

1361

1758

}

1362

1759

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1760

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

1364

1761

if(ret == -1){

1365

perror("sigaction");

1762

perror_plus("sigaction");

1366

1763

exitcode = EX_OSERR;

1367

1764

goto end;

1368

1765

}

1369

1766

}

1370

1767

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

1371

1768

if(ret == -1){

1372

perror("sigaction");

1769

perror_plus("sigaction");

1373

1770

return EX_OSERR;

1374

1771

}

1375

1772

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1773

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

1377

1774

if(ret == -1){

1378

perror("sigaction");

1775

perror_plus("sigaction");

1379

1776

exitcode = EX_OSERR;

1380

1777

goto end;

1381

1778

}

1382

1779

}

1383

1780

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

1384

1781

if(ret == -1){

1385

perror("sigaction");

1782

perror_plus("sigaction");

1386

1783

return EX_OSERR;

1387

1784

}

1388

1785

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1786

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

1390

1787

if(ret == -1){

1391

perror("sigaction");

1788

perror_plus("sigaction");

1392

1789

exitcode = EX_OSERR;

1393

1790

goto end;

1394

1791

}

1411

1808

errno = 0;

1412

1809

ret = seteuid(0);

1413

1810

if(ret == -1){

1414

perror("seteuid");

1811

perror_plus("seteuid");

1415

1812

}

1416

1813

1417

1814

#ifdef __linux__

1421

1818

bool restore_loglevel = true;

1422

1819

if(ret == -1){

1423

1820

restore_loglevel = false;

1424

perror("klogctl");

1821

perror_plus("klogctl");

1425

1822

}

1426

1823

#endif /* __linux__ */

1427

1824

1428

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1826

if(sd < 0){

1430

perror("socket");

1827

perror_plus("socket");

1431

1828

exitcode = EX_OSERR;

1432

1829

#ifdef __linux__

1433

1830

if(restore_loglevel){

1434

1831

ret = klogctl(7, NULL, 0);

1435

1832

if(ret == -1){

1436

perror("klogctl");

1833

perror_plus("klogctl");

1437

1834

}

1438

1835

}

1439

1836

#endif /* __linux__ */

1441

1838

errno = 0;

1442

1839

ret = seteuid(uid);

1443

1840

if(ret == -1){

1444

perror("seteuid");

1841

perror_plus("seteuid");

1445

1842

}

1446

1843

goto end;

1447

1844

}

1448

1845

strcpy(network.ifr_name, interface);

1449

1846

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

1450

1847

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1848

perror_plus("ioctl SIOCGIFFLAGS");

1452

1849

#ifdef __linux__

1453

1850

if(restore_loglevel){

1454

1851

ret = klogctl(7, NULL, 0);

1455

1852

if(ret == -1){

1456

perror("klogctl");

1853

perror_plus("klogctl");

1457

1854

}

1458

1855

}

1459

1856

#endif /* __linux__ */

1462

1859

errno = 0;

1463

1860

ret = seteuid(uid);

1464

1861

if(ret == -1){

1465

perror("seteuid");

1862

perror_plus("seteuid");

1466

1863

}

1467

1864

goto end;

1468

1865

}

1472

1869

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

1473

1870

if(ret == -1){

1474

1871

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1873

exitcode = EX_OSERR;

1477

1874

#ifdef __linux__

1478

1875

if(restore_loglevel){

1479

1876

ret = klogctl(7, NULL, 0);

1480

1877

if(ret == -1){

1481

perror("klogctl");

1878

perror_plus("klogctl");

1482

1879

}

1483

1880

}

1484

1881

#endif /* __linux__ */

1486

1883

errno = 0;

1487

1884

ret = seteuid(uid);

1488

1885

if(ret == -1){

1489

perror("seteuid");

1886

perror_plus("seteuid");

1490

1887

}

1491

1888

goto end;

1492

1889

}

1493

1890

}

1494

/* sleep checking until interface is running */

1891

/* Sleep checking until interface is running.

1892

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

1495

1893

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

1496

1894

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

1497

1895

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1896

perror_plus("ioctl SIOCGIFFLAGS");

1499

1897

} else if(network.ifr_flags & IFF_RUNNING){

1500

1898

break;

1501

1899

}

1502

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1901

ret = nanosleep(&sleeptime, NULL);

1504

1902

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

1505

perror("nanosleep");

1903

perror_plus("nanosleep");

1506

1904

}

1507

1905

}

1508

1906

if(not take_down_interface){

1509

1907

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

1510

1908

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

1511

1909

if(ret == -1){

1512

perror("close");

1910

perror_plus("close");

1513

1911

}

1514

1912

}

1515

1913

#ifdef __linux__

1517

1915

/* Restores kernel loglevel to default */

1518

1916

ret = klogctl(7, NULL, 0);

1519

1917

if(ret == -1){

1520

perror("klogctl");

1918

perror_plus("klogctl");

1521

1919

}

1522

1920

}

1523

1921

#endif /* __linux__ */

1527

1925

/* Lower privileges */

1528

1926

ret = seteuid(uid);

1529

1927

if(ret == -1){

1530

perror("seteuid");

1928

perror_plus("seteuid");

1531

1929

}

1532

1930

} else {

1533

1931

/* Lower privileges permanently */

1534

1932

ret = setuid(uid);

1535

1933

if(ret == -1){

1536

perror("setuid");

1934

perror_plus("setuid");

1537

1935

}

1538

1936

}

1539

1937

}

1555

1953

goto end;

1556

1954

}

1557

1955

1956

if(mkdtemp(tempdir) == NULL){

1957

perror_plus("mkdtemp");

1958

goto end;

1959

}

1558

1960

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

1961

1565

1962

if(quit_now){

1566

1963

goto end;

1608

2005

1609

2006

port = (uint16_t)tmpmax;

1610

2007

*address = '\0';

1611

address = connect_to;

1612

2008

/* Colon in address indicates IPv6 */

1613

2009

int af;

1614

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

2010

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

1615

2011

af = AF_INET6;

2012

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

2013

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

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

1616

2018

} else {

1617

2019

af = AF_INET;

1618

2020

}

2021

address = connect_to;

1619

2022

1620

2023

if(quit_now){

1621

2024

goto end;

1622

2025

}

1623

2026

1624

2027

while(not quit_now){

1625

2028

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

1626

2029

if(quit_now or ret == 0){

1627

2030

break;

1628

2031

}

1629

sleep(15);

1630

};

1631

2032

if(debug){

2033

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

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

1632

2039

if (not quit_now){

1633

2040

exitcode = EXIT_SUCCESS;

1634

2041

}

1635

2042

1636

2043

goto end;

1637

2044

}

1638

2045

1690

2097

if(debug){

1691

2098

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

1692

2099

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

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

2105

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

2106

}

1695

2107

1696

2108

end:

1697

2109

1718

2130

if(gpgme_initialized){

1719

2131

gpgme_release(mc.ctx);

1720

2132

}

2133

2134

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

2135

has seen */

2136

if(mc.current_server != NULL){

2137

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

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

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

1721

2146

1722

2147

/* Take down the network interface */

1723

2148

if(take_down_interface){

1725

2150

errno = 0;

1726

2151

ret = seteuid(0);

1727

2152

if(ret == -1){

1728

perror("seteuid");

2153

perror_plus("seteuid");

1729

2154

}

1730

2155

if(geteuid() == 0){

1731

2156

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

1732

2157

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

2158

perror_plus("ioctl SIOCGIFFLAGS");

1734

2159

} else if(network.ifr_flags & IFF_UP) {

1735

2160

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

1736

2161

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

1737

2162

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2164

}

1740

2165

}

1741

2166

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

1742

2167

if(ret == -1){

1743

perror("close");

2168

perror_plus("close");

1744

2169

}

1745

2170

/* Lower privileges permanently */

1746

2171

errno = 0;

1747

2172

ret = setuid(uid);

1748

2173

if(ret == -1){

1749

perror("setuid");

2174

perror_plus("setuid");

1750

2175

}

1751

2176

}

1752

2177

}

1753

2178

1754

/* Removes the temp directory used by GPGME */

2179

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

1755

2180

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

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

2184

alphasort);

2185

if (numentries > 0){

2186

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

2187

direntry = direntries[i];

1776

2188

char *fullname = NULL;

1777

2189

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

1778

2190

direntry->d_name);

1779

2191

if(ret < 0){

1780

perror("asprintf");

2192

perror_plus("asprintf");

1781

2193

continue;

1782

2194

}

1783

2195

ret = remove(fullname);

1787

2199

}

1788

2200

free(fullname);

1789

2201

}

1790

closedir(d);

2202

}

2203

2204

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

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1791

2208

}

1792

2209

ret = rmdir(tempdir);

1793

2210

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

1794

perror("rmdir");

2211

perror_plus("rmdir");

1795

2212

}

1796

2213

}

1797

2214

1802

2219

&old_sigterm_action,

1803

2220

NULL));

1804

2221

if(ret == -1){

1805

perror("sigaction");

2222

perror_plus("sigaction");

1806

2223

}

1807

2224

do {

1808

2225

ret = raise(signal_received);

1809

2226

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

1810

2227

if(ret != 0){

1811

perror("raise");

2228

perror_plus("raise");

1812

2229

abort();

1813

2230

}

1814

2231

TEMP_FAILURE_RETRY(pause());