/mandos/release : revision 24.1.164

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() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

56

#include <sys/stat.h> /* open() */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

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,

123

122

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

124

123

#define SECKEY "seckey.txt"

125

124

#define PUBKEY "pubkey.txt"

126

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

127

125

128

126

bool debug = false;

129

127

static const char mandos_protocol_version[] = "1";

130

128

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

131

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

129

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

132

130

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

133

131

char *connect_to = NULL;

134

132

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

146

133

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

147

134

typedef struct {

148

135

AvahiSimplePoll *simple_poll;

152

139

gnutls_dh_params_t dh_params;

153

140

const char *priority;

154

141

gpgme_ctx_t ctx;

155

server *current_server;

156

142

} mandos_context;

157

143

158

144

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

159

145

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

160

146

.dh_bits = 1024, .priority = "SECURE256"

161

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

162

.current_server = NULL };

147

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

163

148

164

149

sig_atomic_t quit_now = 0;

165

150

int signal_received = 0;

166

151

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

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

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

174

152

/*

175

153

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

176

154

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

188

166

return buffer_capacity;

189

167

}

190

168

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

229

169

/*

230

170

* Initialize GPGME.

231

171

*/

245

185

246

186

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

247

187

if(fd == -1){

248

perror_plus("open");

188

perror("open");

249

189

return false;

250

190

}

251

191

265

205

266

206

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

267

207

if(ret == -1){

268

perror_plus("close");

208

perror("close");

269

209

}

270

210

gpgme_data_release(pgp_data);

271

211

return true;

284

224

return false;

285

225

}

286

226

287

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

227

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

288

228

rc = gpgme_get_engine_info(&engine_info);

289

229

if(rc != GPG_ERR_NO_ERROR){

290

230

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

396

336

397

337

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

398

338

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

399

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

400

340

plaintext_length = -1;

401

341

goto decrypt_end;

402

342

}

407

347

(size_t)plaintext_length,

408

348

plaintext_capacity);

409

349

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

350

perror("incbuffer");

411

351

plaintext_length = -1;

412

352

goto decrypt_end;

413

353

}

420

360

break;

421

361

}

422

362

if(ret < 0){

423

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

424

364

plaintext_length = -1;

425

365

goto decrypt_end;

426

366

}

483

423

}

484

424

485

425

/* OpenPGP credentials */

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

487

427

if(ret != GNUTLS_E_SUCCESS){

488

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

428

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

429

from

430

-Wunreachable-code

431

*/

489

432

safer_gnutls_strerror(ret));

490

433

gnutls_global_deinit();

491

434

return -1;

646

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

647

590

if(tcp_sd < 0){

648

591

int e = errno;

649

perror_plus("socket");

592

perror("socket");

650

593

errno = e;

651

594

goto mandos_end;

652

595

}

666

609

}

667

610

if(ret < 0 ){

668

611

int e = errno;

669

perror_plus("inet_pton");

612

perror("inet_pton");

670

613

errno = e;

671

614

goto mandos_end;

672

615

}

708

651

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

709

652

char interface[IF_NAMESIZE];

710

653

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

711

perror_plus("if_indextoname");

654

perror("if_indextoname");

712

655

} else {

713

656

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

714

657

ip, interface, port);

728

671

sizeof(addrstr));

729

672

}

730

673

if(pcret == NULL){

731

perror_plus("inet_ntop");

674

perror("inet_ntop");

732

675

} else {

733

676

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

734

677

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

749

692

if(ret < 0){

750

693

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

751

694

int e = errno;

752

perror_plus("connect");

695

perror("connect");

753

696

errno = e;

754

697

}

755

698

goto mandos_end;

768

711

out_size - written));

769

712

if(ret == -1){

770

713

int e = errno;

771

perror_plus("write");

714

perror("write");

772

715

errno = e;

773

716

goto mandos_end;

774

717

}

799

742

goto mandos_end;

800

743

}

801

744

802

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

803

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

804

746

805

747

if(quit_now){

842

784

buffer_capacity);

843

785

if(buffer_capacity == 0){

844

786

int e = errno;

845

perror_plus("incbuffer");

787

perror("incbuffer");

846

788

errno = e;

847

789

goto mandos_end;

848

790

}

953

895

if(e == 0){

954

896

e = errno;

955

897

}

956

perror_plus("close");

898

perror("close");

957

899

}

958

900

gnutls_deinit(session);

959

errno = e;

960

901

if(quit_now){

961

errno = EINTR;

902

e = EINTR;

962

903

retval = -1;

963

904

}

905

errno = e;

964

906

}

965

907

return retval;

966

908

}

1009

951

avahi_proto_to_af(proto));

1010

952

if(ret == 0){

1011

953

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1015

954

}

1016

955

}

1017

956

}

1071

1010

}

1072

1011

}

1073

1012

1074

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

1013

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

1075

1014

static void handle_sigterm(int sig){

1076

1015

if(quit_now){

1077

1016

return;

1079

1018

quit_now = 1;

1080

1019

signal_received = sig;

1081

1020

int old_errno = errno;

1082

/* set main loop to exit */

1083

1021

if(mc.simple_poll != NULL){

1084

1022

avahi_simple_poll_quit(mc.simple_poll);

1085

1023

}

1086

1024

errno = old_errno;

1087

1025

}

1088

1026

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){

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){

1100

1081

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1082

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

1083

flagstring, if_entry->d_name);

1102

1084

}

1103

return false;

1085

free(flagstring);

1086

return 0;

1104

1087

}

1105

return true;

1106

}

1107

1108

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

1109

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1110

1090

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1091

if(flags & IFF_LOOPBACK){

1112

1092

if(debug){

1113

1093

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

1114

ifname);

1094

if_entry->d_name);

1115

1095

}

1116

return false;

1096

return 0;

1117

1097

}

1118

1098

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

1119

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

1099

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

1120

1100

if(debug){

1121

1101

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

1122

ifname);

1102

if_entry->d_name);

1123

1103

}

1124

return true;

1104

return 1;

1125

1105

}

1126

1106

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

1127

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

1107

if(not (flags & IFF_BROADCAST)){

1128

1108

if(debug){

1129

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1142

1114

/* Accept this device */

1143

1115

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

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

1156

return 0;

1157

}

1158

1159

struct ifreq ifr;

1160

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

1161

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1217

int notdotentries(const struct dirent *direntry){

1218

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

1219

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

1220

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

1221

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

1222

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

1223

return 0;

1224

}

1225

return 1;

1226

}

1227

1228

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

1229

int runnable_hook(const struct dirent *direntry){

1230

int ret;

1231

struct stat st;

1232

1233

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

1234

/* Empty name? */

1235

return 0;

1236

}

1237

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

1255

if(ret == -1){

1256

if(debug){

1257

perror_plus("Could not stat plugin");

1258

}

1259

return 0;

1260

}

1261

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

1262

/* Not a regular file */

1263

return 0;

1264

}

1265

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

1266

/* Not executable */

1267

return 0;

1268

}

1269

return 1;

1270

}

1271

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1273

int ret;

1274

struct timespec now;

1275

struct timespec waited_time;

1276

intmax_t block_time;

1277

1278

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1283

}

1284

ret = avahi_simple_poll_iterate(s, -1);

1285

} else {

1286

if (debug){

1287

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

1288

" or wait\n");

1289

}

1290

/* the current time */

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1292

if(ret == -1){

1293

perror_plus("clock_gettime");

1294

return -1;

1295

}

1296

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

1297

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

1298

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1300

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1302

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

1303

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

1304

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

1305

block_time = ((retry_interval

1306

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

1307

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

1308

1309

if (debug){

1310

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

1311

}

1312

1313

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1318

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1320

return 0;

1321

}

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1324

if(ret == -1){

1325

perror_plus("clock_gettime");

1326

return -1;

1327

}

1328

mc.current_server = mc.current_server->next;

1329

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

1330

servers, but don't block */

1331

}

1332

1333

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

1334

}

1335

if(ret != 0){

1336

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

1337

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

1338

}

1339

}

1340

}

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1341

1120

}

1342

1121

1343

1122

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

1362

1141

bool gnutls_initialized = false;

1363

1142

bool gpgme_initialized = false;

1364

1143

float delay = 2.5f;

1365

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

1366

retrying the same server again */

1367

1144

1368

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1369

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1375

1152

errno = 0;

1376

1153

ret = setgid(gid);

1377

1154

if(ret == -1){

1378

perror_plus("setgid");

1155

perror("setgid");

1379

1156

}

1380

1157

1381

1158

/* Lower user privileges (temporarily) */

1382

1159

errno = 0;

1383

1160

ret = seteuid(uid);

1384

1161

if(ret == -1){

1385

perror_plus("seteuid");

1162

perror("seteuid");

1386

1163

}

1387

1164

1388

1165

if(quit_now){

1423

1200

.arg = "SECONDS",

1424

1201

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

1425

1202

.group = 2 },

1426

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

1427

.arg = "SECONDS",

1428

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

1429

.group = 2 },

1430

1203

/*

1431

1204

* These reproduce what we would get without ARGP_NO_HELP

1432

1205

*/

1476

1249

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

1477

1250

argp_error(state, "Bad delay");

1478

1251

}

1479

case 132: /* --retry */

1480

errno = 0;

1481

retry_interval = strtod(arg, &tmp);

1482

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

1483

or (retry_interval * 1000) > INT_MAX

1484

or retry_interval < 0){

1485

argp_error(state, "Bad retry interval");

1486

}

1487

1252

break;

1488

1253

/*

1489

1254

* These reproduce what we would get without ARGP_NO_HELP

1517

1282

case ENOMEM:

1518

1283

default:

1519

1284

errno = ret;

1520

perror_plus("argp_parse");

1285

perror("argp_parse");

1521

1286

exitcode = EX_OSERR;

1522

1287

goto end;

1523

1288

case EINVAL:

1525

1290

goto end;

1526

1291

}

1527

1292

}

1528

1529

{

1530

/* Work around Debian bug #633582:

1531

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

ret = setenv("DEVICE", interface, 1);

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

ret = asprintf(&delaystring, "%f", delay);

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

ret = setenv("DELAY", delaystring, 1);

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

1648

}

1649

1293

1650

1294

if(not debug){

1651

1295

avahi_set_log_function(empty_log);

1652

1296

}

1653

1297

1654

1298

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

1655

1299

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1658

1301

alphasort);

1659

if(ret == 0){

1660

/* No up interfaces, look for any good interfaces */

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

1302

if(ret >= 1){

1666

/* Pick the first interface returned */

1303

/* Pick the first good interface */

1667

1304

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

1668

1305

if(debug){

1669

1306

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

1670

1307

}

1671

1308

if(interface == NULL){

1672

perror_plus("malloc");

1309

perror("malloc");

1673

1310

free(direntries);

1674

1311

exitcode = EXIT_FAILURE;

1675

1312

goto end;

1697

1334

sigemptyset(&sigterm_action.sa_mask);

1698

1335

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

1699

1336

if(ret == -1){

1700

perror_plus("sigaddset");

1337

perror("sigaddset");

1701

1338

exitcode = EX_OSERR;

1702

1339

goto end;

1703

1340

}

1704

1341

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

1705

1342

if(ret == -1){

1706

perror_plus("sigaddset");

1343

perror("sigaddset");

1707

1344

exitcode = EX_OSERR;

1708

1345

goto end;

1709

1346

}

1710

1347

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

1711

1348

if(ret == -1){

1712

perror_plus("sigaddset");

1349

perror("sigaddset");

1713

1350

exitcode = EX_OSERR;

1714

1351

goto end;

1715

1352

}

1719

1356

*/

1720

1357

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

1721

1358

if(ret == -1){

1722

perror_plus("sigaction");

1359

perror("sigaction");

1723

1360

return EX_OSERR;

1724

1361

}

1725

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1726

1363

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

1727

1364

if(ret == -1){

1728

perror_plus("sigaction");

1365

perror("sigaction");

1729

1366

exitcode = EX_OSERR;

1730

1367

goto end;

1731

1368

}

1732

1369

}

1733

1370

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

1734

1371

if(ret == -1){

1735

perror_plus("sigaction");

1372

perror("sigaction");

1736

1373

return EX_OSERR;

1737

1374

}

1738

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1739

1376

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

1740

1377

if(ret == -1){

1741

perror_plus("sigaction");

1378

perror("sigaction");

1742

1379

exitcode = EX_OSERR;

1743

1380

goto end;

1744

1381

}

1745

1382

}

1746

1383

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

1747

1384

if(ret == -1){

1748

perror_plus("sigaction");

1385

perror("sigaction");

1749

1386

return EX_OSERR;

1750

1387

}

1751

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1752

1389

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

1753

1390

if(ret == -1){

1754

perror_plus("sigaction");

1391

perror("sigaction");

1755

1392

exitcode = EX_OSERR;

1756

1393

goto end;

1757

1394

}

1774

1411

errno = 0;

1775

1412

ret = seteuid(0);

1776

1413

if(ret == -1){

1777

perror_plus("seteuid");

1414

perror("seteuid");

1778

1415

}

1779

1416

1780

1417

#ifdef __linux__

1784

1421

bool restore_loglevel = true;

1785

1422

if(ret == -1){

1786

1423

restore_loglevel = false;

1787

perror_plus("klogctl");

1424

perror("klogctl");

1788

1425

}

1789

1426

#endif /* __linux__ */

1790

1427

1791

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

1429

if(sd < 0){

1793

perror_plus("socket");

1430

perror("socket");

1794

1431

exitcode = EX_OSERR;

1795

1432

#ifdef __linux__

1796

1433

if(restore_loglevel){

1797

1434

ret = klogctl(7, NULL, 0);

1798

1435

if(ret == -1){

1799

perror_plus("klogctl");

1436

perror("klogctl");

1800

1437

}

1801

1438

}

1802

1439

#endif /* __linux__ */

1804

1441

errno = 0;

1805

1442

ret = seteuid(uid);

1806

1443

if(ret == -1){

1807

perror_plus("seteuid");

1444

perror("seteuid");

1808

1445

}

1809

1446

goto end;

1810

1447

}

1811

1448

strcpy(network.ifr_name, interface);

1812

1449

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

1813

1450

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1815

1452

#ifdef __linux__

1816

1453

if(restore_loglevel){

1817

1454

ret = klogctl(7, NULL, 0);

1818

1455

if(ret == -1){

1819

perror_plus("klogctl");

1456

perror("klogctl");

1820

1457

}

1821

1458

}

1822

1459

#endif /* __linux__ */

1825

1462

errno = 0;

1826

1463

ret = seteuid(uid);

1827

1464

if(ret == -1){

1828

perror_plus("seteuid");

1465

perror("seteuid");

1829

1466

}

1830

1467

goto end;

1831

1468

}

1835

1472

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

1836

1473

if(ret == -1){

1837

1474

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1839

1476

exitcode = EX_OSERR;

1840

1477

#ifdef __linux__

1841

1478

if(restore_loglevel){

1842

1479

ret = klogctl(7, NULL, 0);

1843

1480

if(ret == -1){

1844

perror_plus("klogctl");

1481

perror("klogctl");

1845

1482

}

1846

1483

}

1847

1484

#endif /* __linux__ */

1849

1486

errno = 0;

1850

1487

ret = seteuid(uid);

1851

1488

if(ret == -1){

1852

perror_plus("seteuid");

1489

perror("seteuid");

1853

1490

}

1854

1491

goto end;

1855

1492

}

1856

1493

}

1857

/* Sleep checking until interface is running.

1858

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

1494

/* sleep checking until interface is running */

1859

1495

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

1860

1496

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

1861

1497

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1863

1499

} else if(network.ifr_flags & IFF_RUNNING){

1864

1500

break;

1865

1501

}

1866

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

1503

ret = nanosleep(&sleeptime, NULL);

1868

1504

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

1869

perror_plus("nanosleep");

1505

perror("nanosleep");

1870

1506

}

1871

1507

}

1872

1508

if(not take_down_interface){

1873

1509

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

1874

1510

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

1875

1511

if(ret == -1){

1876

perror_plus("close");

1512

perror("close");

1877

1513

}

1878

1514

}

1879

1515

#ifdef __linux__

1881

1517

/* Restores kernel loglevel to default */

1882

1518

ret = klogctl(7, NULL, 0);

1883

1519

if(ret == -1){

1884

perror_plus("klogctl");

1520

perror("klogctl");

1885

1521

}

1886

1522

}

1887

1523

#endif /* __linux__ */

1891

1527

/* Lower privileges */

1892

1528

ret = seteuid(uid);

1893

1529

if(ret == -1){

1894

perror_plus("seteuid");

1530

perror("seteuid");

1895

1531

}

1896

1532

} else {

1897

1533

/* Lower privileges permanently */

1898

1534

ret = setuid(uid);

1899

1535

if(ret == -1){

1900

perror_plus("setuid");

1536

perror("setuid");

1901

1537

}

1902

1538

}

1903

1539

}

1919

1555

goto end;

1920

1556

}

1921

1557

1558

tempdir_created = true;

1922

1559

if(mkdtemp(tempdir) == NULL){

1923

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

1924

1562

goto end;

1925

1563

}

1926

tempdir_created = true;

1927

1564

1928

1565

if(quit_now){

1929

1566

goto end;

1971

1608

1972

1609

port = (uint16_t)tmpmax;

1973

1610

*address = '\0';

1611

address = connect_to;

1974

1612

/* Colon in address indicates IPv6 */

1975

1613

int af;

1976

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

1614

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

1977

1615

af = AF_INET6;

1978

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

1979

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

1980

{

1981

connect_to++;

1982

address[-1] = '\0';

1983

}

1984

1616

} else {

1985

1617

af = AF_INET;

1986

1618

}

1987

address = connect_to;

1988

1619

1989

1620

if(quit_now){

1990

1621

goto end;

1991

1622

}

1992

1623

1993

1624

while(not quit_now){

1994

1625

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

1995

1626

if(quit_now or ret == 0){

1996

1627

break;

1997

1628

}

1998

if(debug){

1999

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

2000

(int)retry_interval);

2001

}

2002

sleep((int)retry_interval);

2003

}

2004

1629

sleep(15);

1630

};

1631

2005

1632

if (not quit_now){

2006

1633

exitcode = EXIT_SUCCESS;

2007

1634

}

2008

1635

2009

1636

goto end;

2010

1637

}

2011

1638

2063

1690

if(debug){

2064

1691

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

2065

1692

}

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2069

if(debug){

2070

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

2071

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

2072

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2073

1695

2074

1696

end:

2075

1697

2096

1718

if(gpgme_initialized){

2097

1719

gpgme_release(mc.ctx);

2098

1720

}

2099

2100

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

2101

has seen */

2102

if(mc.current_server != NULL){

2103

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

2104

while(mc.current_server != NULL){

2105

server *next = mc.current_server->next;

2106

free(mc.current_server);

2107

mc.current_server = next;

2108

}

2109

}

2110

2111

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

2112

1721

2113

1722

/* Take down the network interface */

2114

1723

if(take_down_interface){

2116

1725

errno = 0;

2117

1726

ret = seteuid(0);

2118

1727

if(ret == -1){

2119

perror_plus("seteuid");

1728

perror("seteuid");

2120

1729

}

2121

1730

if(geteuid() == 0){

2122

1731

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

2123

1732

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

1733

perror("ioctl SIOCGIFFLAGS");

2125

1734

} else if(network.ifr_flags & IFF_UP) {

2126

1735

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

2127

1736

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

2128

1737

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2130

1739

}

2131

1740

}

2132

1741

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

2133

1742

if(ret == -1){

2134

perror_plus("close");

1743

perror("close");

2135

1744

}

2136

1745

/* Lower privileges permanently */

2137

1746

errno = 0;

2138

1747

ret = setuid(uid);

2139

1748

if(ret == -1){

2140

perror_plus("setuid");

1749

perror("setuid");

2141

1750

}

2142

1751

}

2143

1752

}

2144

1753

2145

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

1754

/* Removes the temp directory used by GPGME */

2146

1755

if(tempdir_created){

2147

struct dirent **direntries = NULL;

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

2152

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

2153

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

}

2154

1776

char *fullname = NULL;

2155

1777

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

2156

1778

direntry->d_name);

2157

1779

if(ret < 0){

2158

perror_plus("asprintf");

1780

perror("asprintf");

2159

1781

continue;

2160

1782

}

2161

1783

ret = remove(fullname);

2165

1787

}

2166

1788

free(fullname);

2167

1789

}

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

1790

closedir(d);

2174

1791

}

2175

1792

ret = rmdir(tempdir);

2176

1793

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

2177

perror_plus("rmdir");

1794

perror("rmdir");

2178

1795

}

2179

1796

}

2180

1797

2185

1802

&old_sigterm_action,

2186

1803

NULL));

2187

1804

if(ret == -1){

2188

perror_plus("sigaction");

1805

perror("sigaction");

2189

1806

}

2190

1807

do {

2191

1808

ret = raise(signal_received);

2192

1809

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

2193

1810

if(ret != 0){

2194

perror_plus("raise");

1811

perror("raise");

2195

1812

abort();

2196

1813

}

2197

1814

TEMP_FAILURE_RETRY(pause());