/mandos/trunk : revision 24.1.135

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

37

42

38

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

#include <stdint.h> /* uint16_t, uint32_t */

45

42

#include <stddef.h> /* NULL, size_t, ssize_t */

46

43

#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

47

srand(), strtof() */

44

srand() */

48

45

#include <stdbool.h> /* bool, false, true */

49

46

#include <string.h> /* memset(), strcmp(), strlen(),

50

47

strerror(), asprintf(), strcpy() */

59

56

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

60

57

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

58

*/

62

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

63

strtoimax() */

59

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

64

60

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

65

61

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

66

62

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

79

75

argp_state, struct argp,

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

78

#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */

86

79

#ifdef __linux__

87

80

#include <sys/klog.h> /* klogctl() */

88

#endif /* __linux__ */

81

#endif

89

82

90

83

/* Avahi */

91

84

/* All Avahi types, constants and functions

143

136

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

144

137

145

138

/*

146

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

147

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

148

* "buffer_length" is how much is already used.

139

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

140

* additional bytes. "buffer_capacity" is how much is currently

141

* allocated, "buffer_length" is how much is already used.

149

142

*/

150

143

size_t incbuffer(char **buffer, size_t buffer_length,

151

144

size_t buffer_capacity){

205

198

}

206

199

207

200

if(debug){

208

fprintf(stderr, "Initializing GPGME\n");

201

fprintf(stderr, "Initialize gpgme\n");

209

202

}

210

203

211

204

/* Init GPGME */

309

302

}

310

303

gpgme_recipient_t recipient;

311

304

recipient = result->recipients;

312

while(recipient != NULL){

313

fprintf(stderr, "Public key algorithm: %s\n",

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

316

fprintf(stderr, "Secret key available: %s\n",

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

319

recipient = recipient->next;

305

if(recipient){

306

while(recipient != NULL){

307

fprintf(stderr, "Public key algorithm: %s\n",

308

gpgme_pubkey_algo_name(recipient->pubkey_algo));

309

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

310

fprintf(stderr, "Secret key available: %s\n",

311

recipient->status == GPG_ERR_NO_SECKEY

312

? "No" : "Yes");

313

recipient = recipient->next;

314

}

320

315

}

321

316

}

322

317

}

514

509

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

515

510

__attribute__((unused)) const char *txt){}

516

511

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

512

/* Called when a Mandos server is found */

521

513

static int start_mandos_communication(const char *ip, uint16_t port,

522

514

AvahiIfIndex if_index,

567

559

568

560

memset(&to, 0, sizeof(to));

569

561

if(af == AF_INET6){

570

to.in6.sin6_family = (sa_family_t)af;

562

to.in6.sin6_family = (uint16_t)af;

571

563

ret = inet_pton(af, ip, &to.in6.sin6_addr);

572

564

} else { /* IPv4 */

573

565

to.in.sin_family = (sa_family_t)af;

796

788

AVAHI_GCC_UNUSED AvahiStringList *txt,

797

789

AVAHI_GCC_UNUSED AvahiLookupResultFlags

798

790

flags,

799

AVAHI_GCC_UNUSED void* userdata){

791

__attribute__((unused)) void* userdata){

800

792

assert(r);

801

793

802

794

/* Called whenever a service has been resolved successfully or

803

795

timed out */

804

796

805

if(quit_now){

806

return;

807

}

808

809

797

switch(event){

810

798

default:

811

799

case AVAHI_RESOLVER_FAILURE:

842

830

const char *domain,

843

831

AVAHI_GCC_UNUSED AvahiLookupResultFlags

844

832

flags,

845

AVAHI_GCC_UNUSED void* userdata){

833

__attribute__((unused)) void* userdata){

846

834

assert(b);

847

835

848

836

/* Called whenever a new services becomes available on the LAN or

863

851

the callback function is called the Avahi server will free the

864

852

resolver for us. */

865

853

866

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

867

name, type, domain, protocol, 0,

868

resolve_callback, NULL) == NULL)

854

if(!(avahi_s_service_resolver_new(mc.server, interface,

855

protocol, name, type, domain,

856

AVAHI_PROTO_INET6, 0,

857

resolve_callback, NULL)))

869

858

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

870

859

name, avahi_strerror(avahi_server_errno(mc.server)));

871

860

break;

883

872

}

884

873

885

874

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

886

static void handle_sigterm(int sig){

887

if(quit_now){

888

return;

889

}

890

quit_now = 1;

891

signal_received = sig;

875

static void handle_sigterm(__attribute__((unused)) int sig){

892

876

int old_errno = errno;

893

if(mc.simple_poll != NULL){

894

avahi_simple_poll_quit(mc.simple_poll);

895

}

877

avahi_simple_poll_quit(mc.simple_poll);

896

878

errno = old_errno;

897

879

}

898

880

901

883

int error;

902

884

int ret;

903

885

intmax_t tmpmax;

904

char *tmp;

886

int numchars;

905

887

int exitcode = EXIT_SUCCESS;

906

888

const char *interface = "eth0";

907

889

struct ifreq network;

908

int sd = -1;

909

bool take_down_interface = false;

890

int sd;

910

891

uid_t uid;

911

892

gid_t gid;

912

893

char *connect_to = NULL;

918

899

919

900

bool gnutls_initialized = false;

920

901

bool gpgme_initialized = false;

921

float delay = 2.5f;

922

902

double delay = 2.5;

903

923

904

struct sigaction old_sigterm_action;

924

905

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

925

906

926

907

{

927

908

struct argp_option options[] = {

928

909

{ .name = "debug", .key = 128,

979

960

pubkey = arg;

980

961

break;

981

962

case 129: /* --dh-bits */

982

errno = 0;

983

tmpmax = strtoimax(arg, &tmp, 10);

984

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

985

or tmpmax != (typeof(mc.dh_bits))tmpmax){

963

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

964

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

965

or arg[numchars] != '\0'){

986

966

fprintf(stderr, "Bad number of DH bits\n");

987

967

exit(EXIT_FAILURE);

988

968

}

992

972

mc.priority = arg;

993

973

break;

994

974

case 131: /* --delay */

995

errno = 0;

996

delay = strtof(arg, &tmp);

997

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

975

ret = sscanf(arg, "%lf%n", &delay, &numchars);

976

if(ret < 1 or arg[numchars] != '\0'){

998

977

fprintf(stderr, "Bad delay\n");

999

978

exit(EXIT_FAILURE);

1000

979

}

1020

999

goto end;

1021

1000

}

1022

1001

}

1023

1002

1024

1003

if(not debug){

1025

1004

avahi_set_log_function(empty_log);

1026

1005

}

1027

1006

1028

1007

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

1029

1008

from the signal handler */

1030

1009

/* Initialize the pseudo-RNG for Avahi */

1035

1014

exitcode = EXIT_FAILURE;

1036

1015

goto end;

1037

1016

}

1038

1017

1039

1018

sigemptyset(&sigterm_action.sa_mask);

1040

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

1041

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1044

goto end;

1045

}

1046

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

1047

if(ret == -1){

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

1019

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

1053

1020

if(ret == -1){

1054

1021

perror("sigaddset");

1055

1022

exitcode = EXIT_FAILURE;

1056

1023

goto end;

1057

1024

}

1058

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

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

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

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

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

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1075

}

1025

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

1026

if(ret == -1){

1027

perror("sigaction");

1028

exitcode = EXIT_FAILURE;

1029

goto end;

1030

}

1031

1076

1032

1077

1033

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

1078

1034

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

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1080

if(if_index == 0){

1081

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

1082

exitcode = EXIT_FAILURE;

1083

goto end;

1084

}

1085

1086

if(quit_now){

1087

goto end;

1088

}

1089

1090

1035

#ifdef __linux__

1091

1036

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1092

1037

messages to mess up the prompt */

1096

1041

restore_loglevel = false;

1097

1042

perror("klogctl");

1098

1043

}

1099

#endif /* __linux__ */

1044

#endif

1100

1045

1101

1046

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1102

1047

if(sd < 0){

1109

1054

perror("klogctl");

1110

1055

}

1111

1056

}

1112

#endif /* __linux__ */

1057

#endif

1113

1058

goto end;

1114

1059

}

1115

1060

strcpy(network.ifr_name, interface);

1123

1068

perror("klogctl");

1124

1069

}

1125

1070

}

1126

#endif /* __linux__ */

1071

#endif

1127

1072

exitcode = EXIT_FAILURE;

1128

1073

goto end;

1129

1074

}

1130

1075

if((network.ifr_flags & IFF_UP) == 0){

1131

1076

network.ifr_flags |= IFF_UP;

1132

take_down_interface = true;

1133

1077

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

1134

1078

if(ret == -1){

1135

take_down_interface = false;

1136

1079

perror("ioctl SIOCSIFFLAGS");

1137

1080

exitcode = EXIT_FAILURE;

1138

1081

#ifdef __linux__

1142

1085

perror("klogctl");

1143

1086

}

1144

1087

}

1145

#endif /* __linux__ */

1088

#endif

1146

1089

goto end;

1147

1090

}

1148

1091

}

1160

1103

perror("nanosleep");

1161

1104

}

1162

1105

}

1163

if(not take_down_interface){

1164

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

1165

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

1166

if(ret == -1){

1167

perror("close");

1168

}

1106

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

1107

if(ret == -1){

1108

perror("close");

1169

1109

}

1170

1110

#ifdef __linux__

1171

1111

if(restore_loglevel){

1175

1115

perror("klogctl");

1176

1116

}

1177

1117

}

1178

#endif /* __linux__ */

1179

}

1180

1181

if(quit_now){

1182

goto end;

1118

#endif

1183

1119

}

1184

1120

1185

1121

uid = getuid();

1196

1132

perror("setuid");

1197

1133

}

1198

1134

1199

if(quit_now){

1200

goto end;

1201

}

1202

1203

1135

ret = init_gnutls_global(pubkey, seckey);

1204

1136

if(ret == -1){

1205

1137

fprintf(stderr, "init_gnutls_global failed\n");

1209

1141

gnutls_initialized = true;

1210

1142

}

1211

1143

1212

if(quit_now){

1213

goto end;

1214

}

1215

1216

tempdir_created = true;

1217

1144

if(mkdtemp(tempdir) == NULL){

1218

tempdir_created = false;

1219

1145

perror("mkdtemp");

1220

1146

goto end;

1221

1147

}

1222

1223

if(quit_now){

1224

goto end;

1225

}

1148

tempdir_created = true;

1226

1149

1227

1150

if(not init_gpgme(pubkey, seckey, tempdir)){

1228

1151

fprintf(stderr, "init_gpgme failed\n");

1232

1155

gpgme_initialized = true;

1233

1156

}

1234

1157

1235

if(quit_now){

1236

goto end;

1158

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

1159

if_index = (AvahiIfIndex) if_nametoindex(interface);

1160

if(if_index == 0){

1161

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

1162

exitcode = EXIT_FAILURE;

1163

goto end;

1164

}

1237

1165

}

1238

1166

1239

1167

if(connect_to != NULL){

1245

1173

exitcode = EXIT_FAILURE;

1246

1174

goto end;

1247

1175

}

1248

1249

if(quit_now){

1250

goto end;

1251

}

1252

1253

1176

uint16_t port;

1254

errno = 0;

1255

tmpmax = strtoimax(address+1, &tmp, 10);

1256

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1257

or tmpmax != (uint16_t)tmpmax){

1177

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1178

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1179

or address[numchars+1] != '\0'){

1258

1180

fprintf(stderr, "Bad port number\n");

1259

1181

exitcode = EXIT_FAILURE;

1260

1182

goto end;

1261

1183

}

1262

1263

if(quit_now){

1264

goto end;

1265

}

1266

1267

1184

port = (uint16_t)tmpmax;

1268

1185

*address = '\0';

1269

1186

address = connect_to;

1274

1191

} else {

1275

1192

af = AF_INET;

1276

1193

}

1277

1278

if(quit_now){

1279

goto end;

1280

}

1281

1282

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

1194

ret = start_mandos_communication(address, port, if_index,

1195

af);

1283

1196

if(ret < 0){

1284

1197

exitcode = EXIT_FAILURE;

1285

1198

} else {

1287

1200

}

1288

1201

goto end;

1289

1202

}

1290

1291

if(quit_now){

1292

goto end;

1293

}

1294

1203

1295

1204

{

1296

1205

AvahiServerConfig config;

1297

1206

/* Do not publish any local Zeroconf records */

1318

1227

goto end;

1319

1228

}

1320

1229

1321

if(quit_now){

1322

goto end;

1323

}

1324

1325

1230

/* Create the Avahi service browser */

1326

1231

sb = avahi_s_service_browser_new(mc.server, if_index,

1327

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1232

AVAHI_PROTO_INET6, "_mandos._tcp",

1328

1233

NULL, 0, browse_callback, NULL);

1329

1234

if(sb == NULL){

1330

1235

fprintf(stderr, "Failed to create service browser: %s\n",

1333

1238

goto end;

1334

1239

}

1335

1240

1336

if(quit_now){

1337

goto end;

1338

}

1339

1340

1241

/* Run the main loop */

1341

1242

1342

1243

if(debug){

1371

1272

gpgme_release(mc.ctx);

1372

1273

}

1373

1274

1374

/* Take down the network interface */

1375

if(take_down_interface){

1376

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

1377

if(ret == -1){

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

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

1381

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

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1385

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1389

}

1390

}

1391

1392

1275

/* Removes the temp directory used by GPGME */

1393

1276

if(tempdir_created){

1394

1277

DIR *d;

1433

1316

}

1434

1317

}

1435

1318

1436

if(quit_now){

1437

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

1438

if(ret == -1){

1439

perror("sigaction");

1440

}

1441

raise(signal_received);

1442

}

1443

1444

1319

return exitcode;

1445

1320

}