/mandos/trunk : revision 359

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

37

41

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

82

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

81

85

82

86

#ifdef __linux__

83

87

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

245

249

return false;

246

250

}

247

251

248

return true;

252

return true;

249

253

}

250

254

251

255

/*

305

309

}

306

310

gpgme_recipient_t recipient;

307

311

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

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;

318

320

}

319

321

}

320

322

}

512

514

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

513

515

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

514

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

515

520

/* Called when a Mandos server is found */

516

521

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

517

522

AvahiIfIndex if_index,

518

523

int af){

519

int ret, tcp_sd;

524

int ret, tcp_sd = -1;

520

525

ssize_t sret;

521

526

union {

522

527

struct sockaddr_in in;

532

537

gnutls_session_t session;

533

538

int pf; /* Protocol family */

534

539

540

if(quit_now){

541

return -1;

542

}

543

535

544

switch(af){

536

545

case AF_INET6:

537

546

pf = PF_INET6;

557

566

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

567

if(tcp_sd < 0){

559

568

perror("socket");

560

return -1;

569

retval = -1;

570

goto mandos_end;

571

}

572

573

if(quit_now){

574

goto mandos_end;

561

575

}

562

576

563

577

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

564

578

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

579

to.in6.sin6_family = (sa_family_t)af;

566

580

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

567

581

} else { /* IPv4 */

568

582

to.in.sin_family = (sa_family_t)af;

570

584

}

571

585

if(ret < 0 ){

572

586

perror("inet_pton");

573

return -1;

587

retval = -1;

588

goto mandos_end;

574

589

}

575

590

if(ret == 0){

576

591

fprintf(stderr, "Bad address: %s\n", ip);

577

return -1;

592

retval = -1;

593

goto mandos_end;

578

594

}

579

595

if(af == AF_INET6){

580

596

to.in6.sin6_port = htons(port); /* Spurious warnings from

587

603

if(if_index == AVAHI_IF_UNSPEC){

588

604

fprintf(stderr, "An IPv6 link-local address is incomplete"

589

605

" without a network interface\n");

590

return -1;

606

retval = -1;

607

goto mandos_end;

591

608

}

592

609

/* Set the network interface number as scope */

593

610

to.in6.sin6_scope_id = (uint32_t)if_index;

598

615

-Wunreachable-code */

599

616

}

600

617

618

if(quit_now){

619

goto mandos_end;

620

}

621

601

622

if(debug){

602

623

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

603

624

char interface[IF_NAMESIZE];

630

651

}

631

652

}

632

653

654

if(quit_now){

655

goto mandos_end;

656

}

657

633

658

if(af == AF_INET6){

634

659

ret = connect(tcp_sd, &to.in6, sizeof(to));

635

660

} else {

637

662

}

638

663

if(ret < 0){

639

664

perror("connect");

640

return -1;

665

retval = -1;

666

goto mandos_end;

667

}

668

669

if(quit_now){

670

goto mandos_end;

641

671

}

642

672

643

673

const char *out = mandos_protocol_version;

662

692

break;

663

693

}

664

694

}

695

696

if(quit_now){

697

goto mandos_end;

698

}

665

699

}

666

700

667

701

if(debug){

668

702

fprintf(stderr, "Establishing TLS session with %s\n", ip);

669

703

}

670

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

671

709

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

710

711

if(quit_now){

712

goto mandos_end;

713

}

714

673

715

do{

674

716

ret = gnutls_handshake(session);

717

if(quit_now){

718

goto mandos_end;

719

}

675

720

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

676

721

677

722

if(ret != GNUTLS_E_SUCCESS){

691

736

}

692

737

693

738

while(true){

739

740

if(quit_now){

741

goto mandos_end;

742

}

743

694

744

buffer_capacity = incbuffer(&buffer, buffer_length,

695

745

buffer_capacity);

696

746

if(buffer_capacity == 0){

699

749

goto mandos_end;

700

750

}

701

751

752

if(quit_now){

753

goto mandos_end;

754

}

755

702

756

sret = gnutls_record_recv(session, buffer+buffer_length,

703

757

BUFFER_SIZE);

704

758

if(sret == 0){

712

766

case GNUTLS_E_REHANDSHAKE:

713

767

do{

714

768

ret = gnutls_handshake(session);

769

770

if(quit_now){

771

goto mandos_end;

772

}

715

773

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

716

774

if(ret < 0){

717

775

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

736

794

fprintf(stderr, "Closing TLS session\n");

737

795

}

738

796

797

if(quit_now){

798

goto mandos_end;

799

}

800

739

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

740

802

803

if(quit_now){

804

goto mandos_end;

805

}

806

741

807

if(buffer_length > 0){

742

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

809

buffer_length,

745

811

if(decrypted_buffer_size >= 0){

746

812

written = 0;

747

813

while(written < (size_t) decrypted_buffer_size){

814

if(quit_now){

815

goto mandos_end;

816

}

817

748

818

ret = (int)fwrite(decrypted_buffer + written, 1,

749

819

(size_t)decrypted_buffer_size - written,

750

820

stdout);

770

840

771

841

mandos_end:

772

842

free(buffer);

773

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

843

if(tcp_sd >= 0){

844

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

845

}

774

846

if(ret == -1){

775

847

perror("close");

776

848

}

777

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

852

}

778

853

return retval;

779

854

}

780

855

797

872

/* Called whenever a service has been resolved successfully or

798

873

timed out */

799

874

875

if(quit_now){

876

return;

877

}

878

800

879

switch(event){

801

880

default:

802

881

case AVAHI_RESOLVER_FAILURE:

839

918

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

840

919

is removed from the LAN */

841

920

921

if(quit_now){

922

return;

923

}

924

842

925

switch(event){

843

926

default:

844

927

case AVAHI_BROWSER_FAILURE:

873

956

}

874

957

}

875

958

876

sig_atomic_t quit_now = 0;

877

878

959

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

879

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

960

static void handle_sigterm(int sig){

880

961

if(quit_now){

881

962

return;

882

963

}

883

964

quit_now = 1;

965

signal_received = sig;

884

966

int old_errno = errno;

885

967

if(mc.simple_poll != NULL){

886

968

avahi_simple_poll_quit(mc.simple_poll);

897

979

int exitcode = EXIT_SUCCESS;

898

980

const char *interface = "eth0";

899

981

struct ifreq network;

900

int sd;

982

int sd = -1;

983

bool take_down_interface = false;

901

984

uid_t uid;

902

985

gid_t gid;

903

986

char *connect_to = NULL;

1046

1129

exitcode = EXIT_FAILURE;

1047

1130

goto end;

1048

1131

}

1049

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

1050

if(ret == -1){

1051

perror("sigaction");

1052

exitcode = EXIT_FAILURE;

1053

goto end;

1054

}

1132

/* Need to check if the handler is SIG_IGN before handling:

1133

| [[info:libc:Initial Signal Actions]] |

1134

| [[info:libc:Basic Signal Handling]] |

1135

*/

1136

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

1137

if(ret == -1){

1138

perror("sigaction");

1139

return EXIT_FAILURE;

1140

}

1141

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

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

1143

if(ret == -1){

1144

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1146

goto end;

1147

}

1148

}

1149

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

1150

if(ret == -1){

1151

perror("sigaction");

1152

return EXIT_FAILURE;

1153

}

1154

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

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

1156

if(ret == -1){

1157

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1159

goto end;

1160

}

1161

}

1162

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

1163

if(ret == -1){

1164

perror("sigaction");

1165

return EXIT_FAILURE;

1166

}

1167

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

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

1169

if(ret == -1){

1170

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1172

goto end;

1173

}

1174

}

1055

1175

1056

1176

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

1057

1177

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

1178

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

if(if_index == 0){

1180

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

1181

exitcode = EXIT_FAILURE;

1182

goto end;

1183

}

1184

1185

if(quit_now){

1186

goto end;

1187

}

1188

1058

1189

#ifdef __linux__

1059

1190

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1060

1191

messages to mess up the prompt */

1097

1228

}

1098

1229

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

1099

1230

network.ifr_flags |= IFF_UP;

1231

take_down_interface = true;

1100

1232

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

1101

1233

if(ret == -1){

1234

take_down_interface = false;

1102

1235

perror("ioctl SIOCSIFFLAGS");

1103

1236

exitcode = EXIT_FAILURE;

1104

1237

#ifdef __linux__

1126

1259

perror("nanosleep");

1127

1260

}

1128

1261

}

1129

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

1130

if(ret == -1){

1131

perror("close");

1262

if(not take_down_interface){

1263

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

1264

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

1265

if(ret == -1){

1266

perror("close");

1267

}

1132

1268

}

1133

1269

#ifdef __linux__

1134

1270

if(restore_loglevel){

1141

1277

#endif /* __linux__ */

1142

1278

}

1143

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1144

1284

uid = getuid();

1145

1285

gid = getgid();

1146

1286

1155

1295

perror("setuid");

1156

1296

}

1157

1297

1298

if(quit_now){

1299

goto end;

1300

}

1301

1158

1302

ret = init_gnutls_global(pubkey, seckey);

1159

1303

if(ret == -1){

1160

1304

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

1164

1308

gnutls_initialized = true;

1165

1309

}

1166

1310

1311

if(quit_now){

1312

goto end;

1313

}

1314

1315

tempdir_created = true;

1167

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1168

1318

perror("mkdtemp");

1169

1319

goto end;

1170

1320

}

1171

tempdir_created = true;

1321

1322

if(quit_now){

1323

goto end;

1324

}

1172

1325

1173

1326

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

1174

1327

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

1178

1331

gpgme_initialized = true;

1179

1332

}

1180

1333

1181

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

1182

if_index = (AvahiIfIndex) if_nametoindex(interface);

1183

if(if_index == 0){

1184

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

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

1334

if(quit_now){

1335

goto end;

1188

1336

}

1189

1337

1190

1338

if(connect_to != NULL){

1196

1344

exitcode = EXIT_FAILURE;

1197

1345

goto end;

1198

1346

}

1347

1348

if(quit_now){

1349

goto end;

1350

}

1351

1199

1352

uint16_t port;

1200

1353

errno = 0;

1201

1354

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

1205

1358

exitcode = EXIT_FAILURE;

1206

1359

goto end;

1207

1360

}

1361

1362

if(quit_now){

1363

goto end;

1364

}

1365

1208

1366

port = (uint16_t)tmpmax;

1209

1367

*address = '\0';

1210

1368

address = connect_to;

1215

1373

} else {

1216

1374

af = AF_INET;

1217

1375

}

1376

1377

if(quit_now){

1378

goto end;

1379

}

1380

1218

1381

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

1219

1382

if(ret < 0){

1220

1383

exitcode = EXIT_FAILURE;

1223

1386

}

1224

1387

goto end;

1225

1388

}

1226

1389

1390

if(quit_now){

1391

goto end;

1392

}

1393

1227

1394

{

1228

1395

AvahiServerConfig config;

1229

1396

/* Do not publish any local Zeroconf records */

1250

1417

goto end;

1251

1418

}

1252

1419

1420

if(quit_now){

1421

goto end;

1422

}

1423

1253

1424

/* Create the Avahi service browser */

1254

1425

sb = avahi_s_service_browser_new(mc.server, if_index,

1255

1426

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1261

1432

goto end;

1262

1433

}

1263

1434

1435

if(quit_now){

1436

goto end;

1437

}

1438

1264

1439

/* Run the main loop */

1265

1440

1266

1441

if(debug){

1295

1470

gpgme_release(mc.ctx);

1296

1471

}

1297

1472

1473

/* Take down the network interface */

1474

if(take_down_interface){

1475

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

1476

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

1484

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1488

}

1489

}

1490

1298

1491

/* Removes the temp directory used by GPGME */

1299

1492

if(tempdir_created){

1300

1493

DIR *d;

1339

1532

}

1340

1533

}

1341

1534

1535

if(quit_now){

1536

sigemptyset(&old_sigterm_action.sa_mask);

1537

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

1539

if(ret == -1){

1540

perror("sigaction");

1541

}

1542

raise(signal_received);

1543

}

1544

1342

1545

return exitcode;

1343

1546

}