/mandos/trunk : revision 312

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

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

78

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

85

81

86

82

#ifdef __linux__

87

83

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

249

245

return false;

250

246

}

251

247

252

return true;

248

return true;

253

249

}

254

250

255

251

/*

309

305

}

310

306

gpgme_recipient_t recipient;

311

307

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;

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

}

320

318

}

321

319

}

322

320

}

514

512

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

515

513

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

516

514

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

515

/* Called when a Mandos server is found */

521

516

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

522

517

AvahiIfIndex if_index,

523

518

int af){

524

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

525

520

ssize_t sret;

526

521

union {

527

522

struct sockaddr_in in;

537

532

gnutls_session_t session;

538

533

int pf; /* Protocol family */

539

534

540

if(quit_now){

541

return -1;

542

}

543

544

535

switch(af){

545

536

case AF_INET6:

546

537

pf = PF_INET6;

566

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

558

if(tcp_sd < 0){

568

559

perror("socket");

569

retval = -1;

570

goto mandos_end;

571

}

572

573

if(quit_now){

574

goto mandos_end;

560

return -1;

575

561

}

576

562

577

563

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

578

564

if(af == AF_INET6){

579

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

580

566

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

581

567

} else { /* IPv4 */

582

568

to.in.sin_family = (sa_family_t)af;

584

570

}

585

571

if(ret < 0 ){

586

572

perror("inet_pton");

587

retval = -1;

588

goto mandos_end;

573

return -1;

589

574

}

590

575

if(ret == 0){

591

576

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

592

retval = -1;

593

goto mandos_end;

577

return -1;

594

578

}

595

579

if(af == AF_INET6){

596

580

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

603

587

if(if_index == AVAHI_IF_UNSPEC){

604

588

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

605

589

" without a network interface\n");

606

retval = -1;

607

goto mandos_end;

590

return -1;

608

591

}

609

592

/* Set the network interface number as scope */

610

593

to.in6.sin6_scope_id = (uint32_t)if_index;

615

598

-Wunreachable-code */

616

599

}

617

600

618

if(quit_now){

619

goto mandos_end;

620

}

621

622

601

if(debug){

623

602

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

624

603

char interface[IF_NAMESIZE];

651

630

}

652

631

}

653

632

654

if(quit_now){

655

goto mandos_end;

656

}

657

658

633

if(af == AF_INET6){

659

634

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

660

635

} else {

662

637

}

663

638

if(ret < 0){

664

639

perror("connect");

665

retval = -1;

666

goto mandos_end;

667

}

668

669

if(quit_now){

670

goto mandos_end;

640

return -1;

671

641

}

672

642

673

643

const char *out = mandos_protocol_version;

692

662

break;

693

663

}

694

664

}

695

696

if(quit_now){

697

goto mandos_end;

698

}

699

665

}

700

666

701

667

if(debug){

702

668

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

703

669

}

704

670

705

if(quit_now){

706

goto mandos_end;

707

}

708

709

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

672

711

if(quit_now){

712

goto mandos_end;

713

}

714

715

673

do{

716

674

ret = gnutls_handshake(session);

717

if(quit_now){

718

goto mandos_end;

719

}

720

675

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

721

676

722

677

if(ret != GNUTLS_E_SUCCESS){

736

691

}

737

692

738

693

while(true){

739

740

if(quit_now){

741

goto mandos_end;

742

}

743

744

694

buffer_capacity = incbuffer(&buffer, buffer_length,

745

695

buffer_capacity);

746

696

if(buffer_capacity == 0){

749

699

goto mandos_end;

750

700

}

751

701

752

if(quit_now){

753

goto mandos_end;

754

}

755

756

702

sret = gnutls_record_recv(session, buffer+buffer_length,

757

703

BUFFER_SIZE);

758

704

if(sret == 0){

766

712

case GNUTLS_E_REHANDSHAKE:

767

713

do{

768

714

ret = gnutls_handshake(session);

769

770

if(quit_now){

771

goto mandos_end;

772

}

773

715

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

774

716

if(ret < 0){

775

717

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

794

736

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

795

737

}

796

738

797

if(quit_now){

798

goto mandos_end;

799

}

800

801

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

740

803

if(quit_now){

804

goto mandos_end;

805

}

806

807

741

if(buffer_length > 0){

808

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

743

buffer_length,

811

745

if(decrypted_buffer_size >= 0){

812

746

written = 0;

813

747

while(written < (size_t) decrypted_buffer_size){

814

if(quit_now){

815

goto mandos_end;

816

}

817

818

748

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

819

749

(size_t)decrypted_buffer_size - written,

820

750

stdout);

840

770

841

771

mandos_end:

842

772

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

773

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

846

774

if(ret == -1){

847

775

perror("close");

848

776

}

849

777

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

852

}

853

778

return retval;

854

779

}

855

780

872

797

/* Called whenever a service has been resolved successfully or

873

798

timed out */

874

799

875

if(quit_now){

876

return;

877

}

878

879

800

switch(event){

880

801

default:

881

802

case AVAHI_RESOLVER_FAILURE:

918

839

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

919

840

is removed from the LAN */

920

841

921

if(quit_now){

922

return;

923

}

924

925

842

switch(event){

926

843

default:

927

844

case AVAHI_BROWSER_FAILURE:

937

854

the callback function is called the Avahi server will free the

938

855

resolver for us. */

939

856

940

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

941

name, type, domain, protocol, 0,

942

resolve_callback, NULL) == NULL)

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

943

861

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

944

862

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

945

863

break;

956

874

}

957

875

}

958

876

877

sig_atomic_t quit_now = 0;

878

959

879

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

960

static void handle_sigterm(int sig){

880

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

961

881

if(quit_now){

962

882

return;

963

883

}

964

884

quit_now = 1;

965

signal_received = sig;

966

885

int old_errno = errno;

967

886

if(mc.simple_poll != NULL){

968

887

avahi_simple_poll_quit(mc.simple_poll);

979

898

int exitcode = EXIT_SUCCESS;

980

899

const char *interface = "eth0";

981

900

struct ifreq network;

982

int sd = -1;

983

bool take_down_interface = false;

901

int sd;

984

902

uid_t uid;

985

903

gid_t gid;

986

904

char *connect_to = NULL;

990

908

const char *seckey = PATHDIR "/" SECKEY;

991

909

const char *pubkey = PATHDIR "/" PUBKEY;

992

910

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

993

915

bool gnutls_initialized = false;

994

916

bool gpgme_initialized = false;

995

917

float delay = 2.5f;

1129

1051

exitcode = EXIT_FAILURE;

1130

1052

goto end;

1131

1053

}

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

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1175

1060

1176

1061

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

1177

1062

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

1189

1063

#ifdef __linux__

1190

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

1065

messages to mess up the prompt */

1228

1102

}

1229

1103

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

1230

1104

network.ifr_flags |= IFF_UP;

1231

take_down_interface = true;

1232

1105

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

1233

1106

if(ret == -1){

1234

take_down_interface = false;

1235

1107

perror("ioctl SIOCSIFFLAGS");

1236

1108

exitcode = EXIT_FAILURE;

1237

1109

#ifdef __linux__

1259

1131

perror("nanosleep");

1260

1132

}

1261

1133

}

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

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1268

1137

}

1269

1138

#ifdef __linux__

1270

1139

if(restore_loglevel){

1277

1146

#endif /* __linux__ */

1278

1147

}

1279

1148

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

1149

uid = getuid();

1285

1150

gid = getgid();

1286

1151

1295

1160

perror("setuid");

1296

1161

}

1297

1162

1298

if(quit_now){

1299

goto end;

1300

}

1301

1302

1163

ret = init_gnutls_global(pubkey, seckey);

1303

1164

if(ret == -1){

1304

1165

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

1308

1169

gnutls_initialized = true;

1309

1170

}

1310

1171

1311

if(quit_now){

1312

goto end;

1313

}

1314

1315

tempdir_created = true;

1316

1172

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

1173

perror("mkdtemp");

1319

1174

goto end;

1320

1175

}

1321

1322

if(quit_now){

1323

goto end;

1324

}

1176

tempdir_created = true;

1325

1177

1326

1178

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

1327

1179

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

1331

1183

gpgme_initialized = true;

1332

1184

}

1333

1185

1334

if(quit_now){

1335

goto end;

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

1336

1193

}

1337

1194

1338

1195

if(connect_to != NULL){

1344

1201

exitcode = EXIT_FAILURE;

1345

1202

goto end;

1346

1203

}

1347

1348

if(quit_now){

1349

goto end;

1350

}

1351

1352

1204

uint16_t port;

1353

1205

errno = 0;

1354

1206

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

1358

1210

exitcode = EXIT_FAILURE;

1359

1211

goto end;

1360

1212

}

1361

1362

if(quit_now){

1363

goto end;

1364

}

1365

1366

1213

port = (uint16_t)tmpmax;

1367

1214

*address = '\0';

1368

1215

address = connect_to;

1373

1220

} else {

1374

1221

af = AF_INET;

1375

1222

}

1376

1377

if(quit_now){

1378

goto end;

1379

}

1380

1381

1223

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

1382

1224

if(ret < 0){

1383

1225

exitcode = EXIT_FAILURE;

1386

1228

}

1387

1229

goto end;

1388

1230

}

1389

1390

if(quit_now){

1391

goto end;

1392

}

1393

1231

1394

1232

{

1395

1233

AvahiServerConfig config;

1396

1234

/* Do not publish any local Zeroconf records */

1417

1255

goto end;

1418

1256

}

1419

1257

1420

if(quit_now){

1421

goto end;

1422

}

1423

1424

1258

/* Create the Avahi service browser */

1425

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

1426

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1427

1261

NULL, 0, browse_callback, NULL);

1428

1262

if(sb == NULL){

1429

1263

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

1432

1266

goto end;

1433

1267

}

1434

1268

1435

if(quit_now){

1436

goto end;

1437

}

1438

1439

1269

/* Run the main loop */

1440

1270

1441

1271

if(debug){

1470

1300

gpgme_release(mc.ctx);

1471

1301

}

1472

1302

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

1491

1303

/* Removes the temp directory used by GPGME */

1492

1304

if(tempdir_created){

1493

1305

DIR *d;

1532

1344

}

1533

1345

}

1534

1346

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

1545

1347

return exitcode;

1546

1348

}