/mandos/trunk : revision 452.1.1

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

65

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

67

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

127

126

bool debug = false;

128

127

static const char mandos_protocol_version[] = "1";

129

128

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

130

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

129

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

131

130

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

132

131

char *connect_to = NULL;

133

132

134

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

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

144

145

133

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

146

134

typedef struct {

147

135

AvahiSimplePoll *simple_poll;

151

139

gnutls_dh_params_t dh_params;

152

140

const char *priority;

153

141

gpgme_ctx_t ctx;

154

server *current_server;

155

142

} mandos_context;

156

143

157

144

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

158

145

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

159

146

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

147

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

162

148

163

149

sig_atomic_t quit_now = 0;

164

150

int signal_received = 0;

165

151

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

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

169

program_invocation_short_name);

170

perror(print_text);

171

}

172

173

152

/*

174

153

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

175

154

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

187

166

return buffer_capacity;

188

167

}

189

168

190

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

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

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

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

214

} else {

215

new_server->next = mc.current_server;

216

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

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

228

169

/*

229

170

* Initialize GPGME.

230

171

*/

244

185

245

186

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

246

187

if(fd == -1){

247

perror_plus("open");

188

perror("open");

248

189

return false;

249

190

}

250

191

264

205

265

206

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

266

207

if(ret == -1){

267

perror_plus("close");

208

perror("close");

268

209

}

269

210

gpgme_data_release(pgp_data);

270

211

return true;

283

224

return false;

284

225

}

285

226

286

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

227

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

287

228

rc = gpgme_get_engine_info(&engine_info);

288

229

if(rc != GPG_ERR_NO_ERROR){

289

230

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

395

336

396

337

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

397

338

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

398

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

399

340

plaintext_length = -1;

400

341

goto decrypt_end;

401

342

}

406

347

(size_t)plaintext_length,

407

348

plaintext_capacity);

408

349

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

350

perror("incbuffer");

410

351

plaintext_length = -1;

411

352

goto decrypt_end;

412

353

}

419

360

break;

420

361

}

421

362

if(ret < 0){

422

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

423

364

plaintext_length = -1;

424

365

goto decrypt_end;

425

366

}

482

423

}

483

424

484

425

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

486

427

if(ret != GNUTLS_E_SUCCESS){

487

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

428

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

429

from

430

-Wunreachable-code

431

*/

488

432

safer_gnutls_strerror(ret));

489

433

gnutls_global_deinit();

490

434

return -1;

645

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

646

590

if(tcp_sd < 0){

647

591

int e = errno;

648

perror_plus("socket");

592

perror("socket");

649

593

errno = e;

650

594

goto mandos_end;

651

595

}

665

609

}

666

610

if(ret < 0 ){

667

611

int e = errno;

668

perror_plus("inet_pton");

612

perror("inet_pton");

669

613

errno = e;

670

614

goto mandos_end;

671

615

}

707

651

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

708

652

char interface[IF_NAMESIZE];

709

653

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

710

perror_plus("if_indextoname");

654

perror("if_indextoname");

711

655

} else {

712

656

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

713

657

ip, interface, port);

727

671

sizeof(addrstr));

728

672

}

729

673

if(pcret == NULL){

730

perror_plus("inet_ntop");

674

perror("inet_ntop");

731

675

} else {

732

676

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

733

677

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

748

692

if(ret < 0){

749

693

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

750

694

int e = errno;

751

perror_plus("connect");

695

perror("connect");

752

696

errno = e;

753

697

}

754

698

goto mandos_end;

767

711

out_size - written));

768

712

if(ret == -1){

769

713

int e = errno;

770

perror_plus("write");

714

perror("write");

771

715

errno = e;

772

716

goto mandos_end;

773

717

}

798

742

goto mandos_end;

799

743

}

800

744

801

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

802

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

803

746

804

747

if(quit_now){

841

784

buffer_capacity);

842

785

if(buffer_capacity == 0){

843

786

int e = errno;

844

perror_plus("incbuffer");

787

perror("incbuffer");

845

788

errno = e;

846

789

goto mandos_end;

847

790

}

952

895

if(e == 0){

953

896

e = errno;

954

897

}

955

perror_plus("close");

898

perror("close");

956

899

}

957

900

gnutls_deinit(session);

958

errno = e;

959

901

if(quit_now){

960

errno = EINTR;

902

e = EINTR;

961

903

retval = -1;

962

904

}

905

errno = e;

963

906

}

964

907

return retval;

965

908

}

1008

951

avahi_proto_to_af(proto));

1009

952

if(ret == 0){

1010

953

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1014

954

}

1015

955

}

1016

956

}

1070

1010

}

1071

1011

}

1072

1012

1073

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

1013

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

1074

1014

static void handle_sigterm(int sig){

1075

1015

if(quit_now){

1076

1016

return;

1078

1018

quit_now = 1;

1079

1019

signal_received = sig;

1080

1020

int old_errno = errno;

1081

/* set main loop to exit */

1082

1021

if(mc.simple_poll != NULL){

1083

1022

avahi_simple_poll_quit(mc.simple_poll);

1084

1023

}

1085

1024

errno = old_errno;

1086

1025

}

1087

1026

1088

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

1089

int ret;

1090

1091

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

1092

if(s < 0){

1093

perror_plus("socket");

1094

return false;

1095

}

1096

strcpy(ifr->ifr_name, ifname);

1097

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1098

if(ret == -1){

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1099

1081

if(debug){

1100

perror_plus("ioctl SIOCGIFFLAGS");

1082

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

1083

flagstring, if_entry->d_name);

1101

1084

}

1102

return false;

1085

free(flagstring);

1086

return 0;

1103

1087

}

1104

return true;

1105

}

1106

1107

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

1108

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1109

1090

/* Reject the loopback device */

1110

if(ifr->ifr_flags & IFF_LOOPBACK){

1091

if(flags & IFF_LOOPBACK){

1111

1092

if(debug){

1112

1093

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

1113

ifname);

1094

if_entry->d_name);

1114

1095

}

1115

return false;

1096

return 0;

1116

1097

}

1117

1098

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

1118

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

1099

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

1119

1100

if(debug){

1120

1101

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

1121

ifname);

1102

if_entry->d_name);

1122

1103

}

1123

return true;

1104

return 1;

1124

1105

}

1125

1106

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

1126

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

1107

if(not (flags & IFF_BROADCAST)){

1127

1108

if(debug){

1128

1109

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

1129

ifname);

1130

}

1131

return false;

1132

}

1133

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

1134

if(ifr->ifr_flags & IFF_NOARP){

1135

if(debug){

1136

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

1137

}

1138

return false;

1139

}

1140

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1141

1114

/* Accept this device */

1142

1115

if(debug){

1143

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

1144

}

1145

return true;

1146

}

1147

1148

/*

1149

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

1150

* corresponds to an acceptable network device.

1151

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

1152

*/

1153

int good_interface(const struct dirent *if_entry){

1154

int ret;

1155

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

1156

return 0;

1157

}

1158

struct ifreq ifr;

1159

1160

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

1161

return 0;

1162

}

1163

1164

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

1165

return 0;

1166

}

1167

return 1;

1168

}

1169

1170

int notdotentries(const struct dirent *direntry){

1171

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

1172

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

1173

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

1174

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

1175

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

1176

return 0;

1177

}

1178

return 1;

1179

}

1180

1181

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1182

int ret;

1183

struct timespec now;

1184

struct timespec waited_time;

1185

intmax_t block_time;

1186

1187

while(true){

1188

if(mc.current_server == NULL){

1189

if (debug){

1190

fprintf(stderr,

1191

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

1192

}

1193

ret = avahi_simple_poll_iterate(s, -1);

1194

} else {

1195

if (debug){

1196

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

1197

" or wait\n");

1198

}

1199

/* the current time */

1200

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1201

if(ret == -1){

1202

perror_plus("clock_gettime");

1203

return -1;

1204

}

1205

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

1206

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

1207

waited_time.tv_sec = (now.tv_sec

1208

- mc.current_server->last_seen.tv_sec);

1209

waited_time.tv_nsec = (now.tv_nsec

1210

- mc.current_server->last_seen.tv_nsec);

1211

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

1212

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

1213

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

1214

block_time = ((retry_interval

1215

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

1216

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

1217

1218

if (debug){

1219

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

1220

}

1221

1222

if(block_time <= 0){

1223

ret = start_mandos_communication(mc.current_server->ip,

1224

mc.current_server->port,

1225

mc.current_server->if_index,

1226

mc.current_server->af);

1227

if(ret == 0){

1228

avahi_simple_poll_quit(mc.simple_poll);

1229

return 0;

1230

}

1231

ret = clock_gettime(CLOCK_MONOTONIC,

1232

&mc.current_server->last_seen);

1233

if(ret == -1){

1234

perror_plus("clock_gettime");

1235

return -1;

1236

}

1237

mc.current_server = mc.current_server->next;

1238

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

1239

servers, but don't block */

1240

}

1241

1242

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

1243

}

1244

if(ret != 0){

1245

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

1246

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

1247

}

1248

}

1249

}

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1250

1120

}

1251

1121

1252

1122

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

1271

1141

bool gnutls_initialized = false;

1272

1142

bool gpgme_initialized = false;

1273

1143

float delay = 2.5f;

1274

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

1275

retrying the same server again */

1276

1144

1277

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1278

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1284

1152

errno = 0;

1285

1153

ret = setgid(gid);

1286

1154

if(ret == -1){

1287

perror_plus("setgid");

1155

perror("setgid");

1288

1156

}

1289

1157

1290

1158

/* Lower user privileges (temporarily) */

1291

1159

errno = 0;

1292

1160

ret = seteuid(uid);

1293

1161

if(ret == -1){

1294

perror_plus("seteuid");

1162

perror("seteuid");

1295

1163

}

1296

1164

1297

1165

if(quit_now){

1332

1200

.arg = "SECONDS",

1333

1201

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

1334

1202

.group = 2 },

1335

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

1336

.arg = "SECONDS",

1337

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

1338

.group = 2 },

1339

1203

/*

1340

1204

* These reproduce what we would get without ARGP_NO_HELP

1341

1205

*/

1385

1249

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

1386

1250

argp_error(state, "Bad delay");

1387

1251

}

1388

case 132: /* --retry */

1389

errno = 0;

1390

retry_interval = strtod(arg, &tmp);

1391

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

1392

or (retry_interval * 1000) > INT_MAX

1393

or retry_interval < 0){

1394

argp_error(state, "Bad retry interval");

1395

}

1396

1252

break;

1397

1253

/*

1398

1254

* These reproduce what we would get without ARGP_NO_HELP

1426

1282

case ENOMEM:

1427

1283

default:

1428

1284

errno = ret;

1429

perror_plus("argp_parse");

1285

perror("argp_parse");

1430

1286

exitcode = EX_OSERR;

1431

1287

goto end;

1432

1288

case EINVAL:

1434

1290

goto end;

1435

1291

}

1436

1292

}

1437

1438

{

1439

/* Work around Debian bug #633582:

1440

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

1441

struct stat st;

1442

1443

/* Re-raise priviliges */

1444

errno = 0;

1445

ret = seteuid(0);

1446

if(ret == -1){

1447

perror_plus("seteuid");

1448

}

1449

1450

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

1451

int seckey_fd = open(seckey, O_RDONLY);

1452

if(seckey_fd == -1){

1453

perror_plus("open");

1454

} else {

1455

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

1456

if(ret == -1){

1457

perror_plus("fstat");

1458

} else {

1459

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

1460

ret = fchown(seckey_fd, uid, gid);

1461

if(ret == -1){

1462

perror_plus("fchown");

1463

}

1464

}

1465

}

1466

TEMP_FAILURE_RETRY(close(seckey_fd));

1467

}

1468

}

1469

1470

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

1471

int pubkey_fd = open(pubkey, O_RDONLY);

1472

if(pubkey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(pubkey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(pubkey_fd));

1487

}

1488

}

1489

1490

/* Lower privileges */

1491

errno = 0;

1492

ret = seteuid(uid);

1493

if(ret == -1){

1494

perror_plus("seteuid");

1495

}

1496

}

1497

1293

1498

1294

if(not debug){

1499

1295

avahi_set_log_function(empty_log);

1510

1306

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

1511

1307

}

1512

1308

if(interface == NULL){

1513

perror_plus("malloc");

1309

perror("malloc");

1514

1310

free(direntries);

1515

1311

exitcode = EXIT_FAILURE;

1516

1312

goto end;

1538

1334

sigemptyset(&sigterm_action.sa_mask);

1539

1335

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

1540

1336

if(ret == -1){

1541

perror_plus("sigaddset");

1337

perror("sigaddset");

1542

1338

exitcode = EX_OSERR;

1543

1339

goto end;

1544

1340

}

1545

1341

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

1546

1342

if(ret == -1){

1547

perror_plus("sigaddset");

1343

perror("sigaddset");

1548

1344

exitcode = EX_OSERR;

1549

1345

goto end;

1550

1346

}

1551

1347

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

1552

1348

if(ret == -1){

1553

perror_plus("sigaddset");

1349

perror("sigaddset");

1554

1350

exitcode = EX_OSERR;

1555

1351

goto end;

1556

1352

}

1560

1356

*/

1561

1357

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

1562

1358

if(ret == -1){

1563

perror_plus("sigaction");

1359

perror("sigaction");

1564

1360

return EX_OSERR;

1565

1361

}

1566

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1567

1363

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

1568

1364

if(ret == -1){

1569

perror_plus("sigaction");

1365

perror("sigaction");

1570

1366

exitcode = EX_OSERR;

1571

1367

goto end;

1572

1368

}

1573

1369

}

1574

1370

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

1575

1371

if(ret == -1){

1576

perror_plus("sigaction");

1372

perror("sigaction");

1577

1373

return EX_OSERR;

1578

1374

}

1579

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1580

1376

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

1581

1377

if(ret == -1){

1582

perror_plus("sigaction");

1378

perror("sigaction");

1583

1379

exitcode = EX_OSERR;

1584

1380

goto end;

1585

1381

}

1586

1382

}

1587

1383

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

1588

1384

if(ret == -1){

1589

perror_plus("sigaction");

1385

perror("sigaction");

1590

1386

return EX_OSERR;

1591

1387

}

1592

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1593

1389

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

1594

1390

if(ret == -1){

1595

perror_plus("sigaction");

1391

perror("sigaction");

1596

1392

exitcode = EX_OSERR;

1597

1393

goto end;

1598

1394

}

1615

1411

errno = 0;

1616

1412

ret = seteuid(0);

1617

1413

if(ret == -1){

1618

perror_plus("seteuid");

1414

perror("seteuid");

1619

1415

}

1620

1416

1621

1417

#ifdef __linux__

1625

1421

bool restore_loglevel = true;

1626

1422

if(ret == -1){

1627

1423

restore_loglevel = false;

1628

perror_plus("klogctl");

1424

perror("klogctl");

1629

1425

}

1630

1426

#endif /* __linux__ */

1631

1427

1632

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1633

1429

if(sd < 0){

1634

perror_plus("socket");

1430

perror("socket");

1635

1431

exitcode = EX_OSERR;

1636

1432

#ifdef __linux__

1637

1433

if(restore_loglevel){

1638

1434

ret = klogctl(7, NULL, 0);

1639

1435

if(ret == -1){

1640

perror_plus("klogctl");

1436

perror("klogctl");

1641

1437

}

1642

1438

}

1643

1439

#endif /* __linux__ */

1645

1441

errno = 0;

1646

1442

ret = seteuid(uid);

1647

1443

if(ret == -1){

1648

perror_plus("seteuid");

1444

perror("seteuid");

1649

1445

}

1650

1446

goto end;

1651

1447

}

1652

1448

strcpy(network.ifr_name, interface);

1653

1449

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

1654

1450

if(ret == -1){

1655

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1656

1452

#ifdef __linux__

1657

1453

if(restore_loglevel){

1658

1454

ret = klogctl(7, NULL, 0);

1659

1455

if(ret == -1){

1660

perror_plus("klogctl");

1456

perror("klogctl");

1661

1457

}

1662

1458

}

1663

1459

#endif /* __linux__ */

1666

1462

errno = 0;

1667

1463

ret = seteuid(uid);

1668

1464

if(ret == -1){

1669

perror_plus("seteuid");

1465

perror("seteuid");

1670

1466

}

1671

1467

goto end;

1672

1468

}

1676

1472

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

1677

1473

if(ret == -1){

1678

1474

take_down_interface = false;

1679

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1680

1476

exitcode = EX_OSERR;

1681

1477

#ifdef __linux__

1682

1478

if(restore_loglevel){

1683

1479

ret = klogctl(7, NULL, 0);

1684

1480

if(ret == -1){

1685

perror_plus("klogctl");

1481

perror("klogctl");

1686

1482

}

1687

1483

}

1688

1484

#endif /* __linux__ */

1690

1486

errno = 0;

1691

1487

ret = seteuid(uid);

1692

1488

if(ret == -1){

1693

perror_plus("seteuid");

1489

perror("seteuid");

1694

1490

}

1695

1491

goto end;

1696

1492

}

1697

1493

}

1698

/* Sleep checking until interface is running.

1699

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

1494

/* sleep checking until interface is running */

1700

1495

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

1701

1496

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

1702

1497

if(ret == -1){

1703

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1704

1499

} else if(network.ifr_flags & IFF_RUNNING){

1705

1500

break;

1706

1501

}

1707

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1708

1503

ret = nanosleep(&sleeptime, NULL);

1709

1504

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

1710

perror_plus("nanosleep");

1505

perror("nanosleep");

1711

1506

}

1712

1507

}

1713

1508

if(not take_down_interface){

1714

1509

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

1715

1510

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

1716

1511

if(ret == -1){

1717

perror_plus("close");

1512

perror("close");

1718

1513

}

1719

1514

}

1720

1515

#ifdef __linux__

1722

1517

/* Restores kernel loglevel to default */

1723

1518

ret = klogctl(7, NULL, 0);

1724

1519

if(ret == -1){

1725

perror_plus("klogctl");

1520

perror("klogctl");

1726

1521

}

1727

1522

}

1728

1523

#endif /* __linux__ */

1732

1527

/* Lower privileges */

1733

1528

ret = seteuid(uid);

1734

1529

if(ret == -1){

1735

perror_plus("seteuid");

1530

perror("seteuid");

1736

1531

}

1737

1532

} else {

1738

1533

/* Lower privileges permanently */

1739

1534

ret = setuid(uid);

1740

1535

if(ret == -1){

1741

perror_plus("setuid");

1536

perror("setuid");

1742

1537

}

1743

1538

}

1744

1539

}

1760

1555

goto end;

1761

1556

}

1762

1557

1558

tempdir_created = true;

1763

1559

if(mkdtemp(tempdir) == NULL){

1764

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

1765

1562

goto end;

1766

1563

}

1767

tempdir_created = true;

1768

1564

1769

1565

if(quit_now){

1770

1566

goto end;

1812

1608

1813

1609

port = (uint16_t)tmpmax;

1814

1610

*address = '\0';

1611

address = connect_to;

1815

1612

/* Colon in address indicates IPv6 */

1816

1613

int af;

1817

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

1614

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

1818

1615

af = AF_INET6;

1819

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

1820

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

1821

{

1822

connect_to++;

1823

address[-1] = '\0';

1824

}

1825

1616

} else {

1826

1617

af = AF_INET;

1827

1618

}

1828

address = connect_to;

1829

1619

1830

1620

if(quit_now){

1831

1621

goto end;

1832

1622

}

1833

1623

1834

1624

while(not quit_now){

1835

1625

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

1836

1626

if(quit_now or ret == 0){

1837

1627

break;

1838

1628

}

1839

if(debug){

1840

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

1841

(int)retry_interval);

1842

}

1843

sleep((int)retry_interval);

1844

}

1845

1629

sleep(15);

1630

};

1631

1846

1632

if (not quit_now){

1847

1633

exitcode = EXIT_SUCCESS;

1848

1634

}

1904

1690

if(debug){

1905

1691

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

1906

1692

}

1907

1908

ret = avahi_loop_with_timeout(mc.simple_poll,

1909

(int)(retry_interval * 1000));

1910

if(debug){

1911

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

1912

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

1913

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

1914

1695

1915

1696

end:

1916

1697

1937

1718

if(gpgme_initialized){

1938

1719

gpgme_release(mc.ctx);

1939

1720

}

1940

1941

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

1942

has seen */

1943

if(mc.current_server != NULL){

1944

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

1945

while(mc.current_server != NULL){

1946

server *next = mc.current_server->next;

1947

free(mc.current_server);

1948

mc.current_server = next;

1949

}

1950

}

1951

1721

1952

1722

/* Take down the network interface */

1953

1723

if(take_down_interface){

1955

1725

errno = 0;

1956

1726

ret = seteuid(0);

1957

1727

if(ret == -1){

1958

perror_plus("seteuid");

1728

perror("seteuid");

1959

1729

}

1960

1730

if(geteuid() == 0){

1961

1731

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

1962

1732

if(ret == -1){

1963

perror_plus("ioctl SIOCGIFFLAGS");

1733

perror("ioctl SIOCGIFFLAGS");

1964

1734

} else if(network.ifr_flags & IFF_UP) {

1965

1735

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

1966

1736

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

1967

1737

if(ret == -1){

1968

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1969

1739

}

1970

1740

}

1971

1741

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

1972

1742

if(ret == -1){

1973

perror_plus("close");

1743

perror("close");

1974

1744

}

1975

1745

/* Lower privileges permanently */

1976

1746

errno = 0;

1977

1747

ret = setuid(uid);

1978

1748

if(ret == -1){

1979

perror_plus("setuid");

1749

perror("setuid");

1980

1750

}

1981

1751

}

1982

1752

}

1983

1753

1984

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

1754

/* Removes the temp directory used by GPGME */

1985

1755

if(tempdir_created){

1986

struct dirent **direntries = NULL;

1987

struct dirent *direntry = NULL;

1988

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

1989

alphasort);

1990

if (numentries > 0){

1991

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

1992

direntry = direntries[i];

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

}

1993

1776

char *fullname = NULL;

1994

1777

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

1995

1778

direntry->d_name);

1996

1779

if(ret < 0){

1997

perror_plus("asprintf");

1780

perror("asprintf");

1998

1781

continue;

1999

1782

}

2000

1783

ret = remove(fullname);

2004

1787

}

2005

1788

free(fullname);

2006

1789

}

2007

}

2008

2009

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

2010

free(direntries);

2011

if (numentries == -1){

2012

perror_plus("scandir");

1790

closedir(d);

2013

1791

}

2014

1792

ret = rmdir(tempdir);

2015

1793

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

2016

perror_plus("rmdir");

1794

perror("rmdir");

2017

1795

}

2018

1796

}

2019

1797

2024

1802

&old_sigterm_action,

2025

1803

NULL));

2026

1804

if(ret == -1){

2027

perror_plus("sigaction");

1805

perror("sigaction");

2028

1806

}

2029

1807

do {

2030

1808

ret = raise(signal_received);

2031

1809

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

2032

1810

if(ret != 0){

2033

perror_plus("raise");

1811

perror("raise");

2034

1812

abort();

2035

1813

}

2036

1814

TEMP_FAILURE_RETRY(pause());