/mandos/release : revision 237.2.190

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 */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

74

73

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

75

74

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

76

75

setgid(), pause() */

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

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);

746

690

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

747

691

}

748

692

if(ret < 0){

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

693

int e = errno;

694

perror("connect");

695

errno = e;

754

696

goto mandos_end;

755

697

}

756

698

767

709

out_size - written));

768

710

if(ret == -1){

769

711

int e = errno;

770

perror_plus("write");

712

perror("write");

771

713

errno = e;

772

714

goto mandos_end;

773

715

}

798

740

goto mandos_end;

799

741

}

800

742

801

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

802

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

803

744

804

745

if(quit_now){

841

782

buffer_capacity);

842

783

if(buffer_capacity == 0){

843

784

int e = errno;

844

perror_plus("incbuffer");

785

perror("incbuffer");

845

786

errno = e;

846

787

goto mandos_end;

847

788

}

952

893

if(e == 0){

953

894

e = errno;

954

895

}

955

perror_plus("close");

896

perror("close");

956

897

}

957

898

gnutls_deinit(session);

958

errno = e;

959

899

if(quit_now){

960

errno = EINTR;

900

e = EINTR;

961

901

retval = -1;

962

902

}

903

errno = e;

963

904

}

964

905

return retval;

965

906

}

1008

949

avahi_proto_to_af(proto));

1009

950

if(ret == 0){

1010

951

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1014

952

}

1015

953

}

1016

954

}

1070

1008

}

1071

1009

}

1072

1010

1073

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

1011

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

1074

1012

static void handle_sigterm(int sig){

1075

1013

if(quit_now){

1076

1014

return;

1078

1016

quit_now = 1;

1079

1017

signal_received = sig;

1080

1018

int old_errno = errno;

1081

/* set main loop to exit */

1082

1019

if(mc.simple_poll != NULL){

1083

1020

avahi_simple_poll_quit(mc.simple_poll);

1084

1021

}

1085

1022

errno = old_errno;

1086

1023

}

1087

1024

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){

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

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

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

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

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

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

1048

/* read line from flags_fd */

1049

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

1050

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

1051

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

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

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

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

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

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1099

1079

if(debug){

1100

perror_plus("ioctl SIOCGIFFLAGS");

1080

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

1081

flagstring, if_entry->d_name);

1101

1082

}

1102

return false;

1083

free(flagstring);

1084

return 0;

1103

1085

}

1104

return true;

1105

}

1106

1107

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

1108

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1109

1088

/* Reject the loopback device */

1110

if(ifr->ifr_flags & IFF_LOOPBACK){

1089

if(flags & IFF_LOOPBACK){

1111

1090

if(debug){

1112

1091

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

1113

ifname);

1092

if_entry->d_name);

1114

1093

}

1115

return false;

1094

return 0;

1116

1095

}

1117

1096

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

1118

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

1097

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

1119

1098

if(debug){

1120

1099

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

1121

ifname);

1100

if_entry->d_name);

1122

1101

}

1123

return true;

1102

return 1;

1124

1103

}

1125

1104

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

1126

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

1105

if(not (flags & IFF_BROADCAST)){

1127

1106

if(debug){

1128

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1141

1112

/* Accept this device */

1142

1113

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

}

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1250

1118

}

1251

1119

1252

1120

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

1271

1139

bool gnutls_initialized = false;

1272

1140

bool gpgme_initialized = false;

1273

1141

float delay = 2.5f;

1274

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

1275

retrying the same server again */

1276

1142

1277

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1278

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1284

1150

errno = 0;

1285

1151

ret = setgid(gid);

1286

1152

if(ret == -1){

1287

perror_plus("setgid");

1153

perror("setgid");

1288

1154

}

1289

1155

1290

1156

/* Lower user privileges (temporarily) */

1291

1157

errno = 0;

1292

1158

ret = seteuid(uid);

1293

1159

if(ret == -1){

1294

perror_plus("seteuid");

1160

perror("seteuid");

1295

1161

}

1296

1162

1297

1163

if(quit_now){

1332

1198

.arg = "SECONDS",

1333

1199

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

1334

1200

.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

1201

/*

1340

1202

* These reproduce what we would get without ARGP_NO_HELP

1341

1203

*/

1385

1247

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

1386

1248

argp_error(state, "Bad delay");

1387

1249

}

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

1250

break;

1397

1251

/*

1398

1252

* These reproduce what we would get without ARGP_NO_HELP

1426

1280

case ENOMEM:

1427

1281

default:

1428

1282

errno = ret;

1429

perror_plus("argp_parse");

1283

perror("argp_parse");

1430

1284

exitcode = EX_OSERR;

1431

1285

goto end;

1432

1286

case EINVAL:

1434

1288

goto end;

1435

1289

}

1436

1290

}

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

1291

1498

1292

if(not debug){

1499

1293

avahi_set_log_function(empty_log);

1510

1304

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

1511

1305

}

1512

1306

if(interface == NULL){

1513

perror_plus("malloc");

1307

perror("malloc");

1514

1308

free(direntries);

1515

1309

exitcode = EXIT_FAILURE;

1516

1310

goto end;

1538

1332

sigemptyset(&sigterm_action.sa_mask);

1539

1333

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

1540

1334

if(ret == -1){

1541

perror_plus("sigaddset");

1335

perror("sigaddset");

1542

1336

exitcode = EX_OSERR;

1543

1337

goto end;

1544

1338

}

1545

1339

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

1546

1340

if(ret == -1){

1547

perror_plus("sigaddset");

1341

perror("sigaddset");

1548

1342

exitcode = EX_OSERR;

1549

1343

goto end;

1550

1344

}

1551

1345

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

1552

1346

if(ret == -1){

1553

perror_plus("sigaddset");

1347

perror("sigaddset");

1554

1348

exitcode = EX_OSERR;

1555

1349

goto end;

1556

1350

}

1560

1354

*/

1561

1355

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

1562

1356

if(ret == -1){

1563

perror_plus("sigaction");

1357

perror("sigaction");

1564

1358

return EX_OSERR;

1565

1359

}

1566

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1567

1361

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

1568

1362

if(ret == -1){

1569

perror_plus("sigaction");

1363

perror("sigaction");

1570

1364

exitcode = EX_OSERR;

1571

1365

goto end;

1572

1366

}

1573

1367

}

1574

1368

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

1575

1369

if(ret == -1){

1576

perror_plus("sigaction");

1370

perror("sigaction");

1577

1371

return EX_OSERR;

1578

1372

}

1579

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1580

1374

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

1581

1375

if(ret == -1){

1582

perror_plus("sigaction");

1376

perror("sigaction");

1583

1377

exitcode = EX_OSERR;

1584

1378

goto end;

1585

1379

}

1586

1380

}

1587

1381

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

1588

1382

if(ret == -1){

1589

perror_plus("sigaction");

1383

perror("sigaction");

1590

1384

return EX_OSERR;

1591

1385

}

1592

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1593

1387

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

1594

1388

if(ret == -1){

1595

perror_plus("sigaction");

1389

perror("sigaction");

1596

1390

exitcode = EX_OSERR;

1597

1391

goto end;

1598

1392

}

1615

1409

errno = 0;

1616

1410

ret = seteuid(0);

1617

1411

if(ret == -1){

1618

perror_plus("seteuid");

1412

perror("seteuid");

1619

1413

}

1620

1414

1621

1415

#ifdef __linux__

1625

1419

bool restore_loglevel = true;

1626

1420

if(ret == -1){

1627

1421

restore_loglevel = false;

1628

perror_plus("klogctl");

1422

perror("klogctl");

1629

1423

}

1630

1424

#endif /* __linux__ */

1631

1425

1632

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1633

1427

if(sd < 0){

1634

perror_plus("socket");

1428

perror("socket");

1635

1429

exitcode = EX_OSERR;

1636

1430

#ifdef __linux__

1637

1431

if(restore_loglevel){

1638

1432

ret = klogctl(7, NULL, 0);

1639

1433

if(ret == -1){

1640

perror_plus("klogctl");

1434

perror("klogctl");

1641

1435

}

1642

1436

}

1643

1437

#endif /* __linux__ */

1645

1439

errno = 0;

1646

1440

ret = seteuid(uid);

1647

1441

if(ret == -1){

1648

perror_plus("seteuid");

1442

perror("seteuid");

1649

1443

}

1650

1444

goto end;

1651

1445

}

1652

1446

strcpy(network.ifr_name, interface);

1653

1447

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

1654

1448

if(ret == -1){

1655

perror_plus("ioctl SIOCGIFFLAGS");

1449

perror("ioctl SIOCGIFFLAGS");

1656

1450

#ifdef __linux__

1657

1451

if(restore_loglevel){

1658

1452

ret = klogctl(7, NULL, 0);

1659

1453

if(ret == -1){

1660

perror_plus("klogctl");

1454

perror("klogctl");

1661

1455

}

1662

1456

}

1663

1457

#endif /* __linux__ */

1666

1460

errno = 0;

1667

1461

ret = seteuid(uid);

1668

1462

if(ret == -1){

1669

perror_plus("seteuid");

1463

perror("seteuid");

1670

1464

}

1671

1465

goto end;

1672

1466

}

1676

1470

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

1677

1471

if(ret == -1){

1678

1472

take_down_interface = false;

1679

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1680

1474

exitcode = EX_OSERR;

1681

1475

#ifdef __linux__

1682

1476

if(restore_loglevel){

1683

1477

ret = klogctl(7, NULL, 0);

1684

1478

if(ret == -1){

1685

perror_plus("klogctl");

1479

perror("klogctl");

1686

1480

}

1687

1481

}

1688

1482

#endif /* __linux__ */

1690

1484

errno = 0;

1691

1485

ret = seteuid(uid);

1692

1486

if(ret == -1){

1693

perror_plus("seteuid");

1487

perror("seteuid");

1694

1488

}

1695

1489

goto end;

1696

1490

}

1697

1491

}

1698

/* Sleep checking until interface is running.

1699

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

1492

/* sleep checking until interface is running */

1700

1493

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

1701

1494

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

1702

1495

if(ret == -1){

1703

perror_plus("ioctl SIOCGIFFLAGS");

1496

perror("ioctl SIOCGIFFLAGS");

1704

1497

} else if(network.ifr_flags & IFF_RUNNING){

1705

1498

break;

1706

1499

}

1707

1500

struct timespec sleeptime = { .tv_nsec = 250000000 };

1708

1501

ret = nanosleep(&sleeptime, NULL);

1709

1502

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

1710

perror_plus("nanosleep");

1503

perror("nanosleep");

1711

1504

}

1712

1505

}

1713

1506

if(not take_down_interface){

1714

1507

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

1715

1508

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

1716

1509

if(ret == -1){

1717

perror_plus("close");

1510

perror("close");

1718

1511

}

1719

1512

}

1720

1513

#ifdef __linux__

1722

1515

/* Restores kernel loglevel to default */

1723

1516

ret = klogctl(7, NULL, 0);

1724

1517

if(ret == -1){

1725

perror_plus("klogctl");

1518

perror("klogctl");

1726

1519

}

1727

1520

}

1728

1521

#endif /* __linux__ */

1732

1525

/* Lower privileges */

1733

1526

ret = seteuid(uid);

1734

1527

if(ret == -1){

1735

perror_plus("seteuid");

1528

perror("seteuid");

1736

1529

}

1737

1530

} else {

1738

1531

/* Lower privileges permanently */

1739

1532

ret = setuid(uid);

1740

1533

if(ret == -1){

1741

perror_plus("setuid");

1534

perror("setuid");

1742

1535

}

1743

1536

}

1744

1537

}

1760

1553

goto end;

1761

1554

}

1762

1555

1556

tempdir_created = true;

1763

1557

if(mkdtemp(tempdir) == NULL){

1764

perror_plus("mkdtemp");

1558

tempdir_created = false;

1559

perror("mkdtemp");

1765

1560

goto end;

1766

1561

}

1767

tempdir_created = true;

1768

1562

1769

1563

if(quit_now){

1770

1564

goto end;

1812

1606

1813

1607

port = (uint16_t)tmpmax;

1814

1608

*address = '\0';

1609

address = connect_to;

1815

1610

/* Colon in address indicates IPv6 */

1816

1611

int af;

1817

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

1612

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

1818

1613

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

1614

} else {

1826

1615

af = AF_INET;

1827

1616

}

1828

address = connect_to;

1829

1617

1830

1618

if(quit_now){

1831

1619

goto end;

1832

1620

}

1833

1621

1834

while(not quit_now){

1835

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

1836

if(quit_now or ret == 0){

1837

break;

1838

}

1839

if(debug){

1840

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

1841

(int)retry_interval);

1842

}

1843

sleep((int)retry_interval);

1844

}

1845

1846

if (not quit_now){

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1643

} else {

1847

1644

exitcode = EXIT_SUCCESS;

1848

1645

}

1849

1850

1646

goto end;

1851

1647

}

1852

1648

1904

1700

if(debug){

1905

1701

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

1906

1702

}

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

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

1914

1705

1915

1706

end:

1916

1707

1937

1728

if(gpgme_initialized){

1938

1729

gpgme_release(mc.ctx);

1939

1730

}

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

1731

1952

1732

/* Take down the network interface */

1953

1733

if(take_down_interface){

1955

1735

errno = 0;

1956

1736

ret = seteuid(0);

1957

1737

if(ret == -1){

1958

perror_plus("seteuid");

1738

perror("seteuid");

1959

1739

}

1960

1740

if(geteuid() == 0){

1961

1741

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

1962

1742

if(ret == -1){

1963

perror_plus("ioctl SIOCGIFFLAGS");

1743

perror("ioctl SIOCGIFFLAGS");

1964

1744

} else if(network.ifr_flags & IFF_UP) {

1965

1745

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

1966

1746

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

1967

1747

if(ret == -1){

1968

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1969

1749

}

1970

1750

}

1971

1751

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

1972

1752

if(ret == -1){

1973

perror_plus("close");

1753

perror("close");

1974

1754

}

1975

1755

/* Lower privileges permanently */

1976

1756

errno = 0;

1977

1757

ret = setuid(uid);

1978

1758

if(ret == -1){

1979

perror_plus("setuid");

1759

perror("setuid");

1980

1760

}

1981

1761

}

1982

1762

}

1983

1763

1984

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

1764

/* Removes the temp directory used by GPGME */

1985

1765

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];

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

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

1782

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

1783

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

1784

continue;

1785

}

1993

1786

char *fullname = NULL;

1994

1787

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

1995

1788

direntry->d_name);

1996

1789

if(ret < 0){

1997

perror_plus("asprintf");

1790

perror("asprintf");

1998

1791

continue;

1999

1792

}

2000

1793

ret = remove(fullname);

2004

1797

}

2005

1798

free(fullname);

2006

1799

}

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");

1800

closedir(d);

2013

1801

}

2014

1802

ret = rmdir(tempdir);

2015

1803

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

2016

perror_plus("rmdir");

1804

perror("rmdir");

2017

1805

}

2018

1806

}

2019

1807

2024

1812

&old_sigterm_action,

2025

1813

NULL));

2026

1814

if(ret == -1){

2027

perror_plus("sigaction");

1815

perror("sigaction");

2028

1816

}

2029

1817

do {

2030

1818

ret = raise(signal_received);

2031

1819

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

2032

1820

if(ret != 0){

2033

perror_plus("raise");

1821

perror("raise");

2034

1822

abort();

2035

1823

}

2036

1824

TEMP_FAILURE_RETRY(pause());