/mandos/release : revision 24.1.139

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

86

#ifdef __linux__

87

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

249

return false;

250

}

251

252

return true;

252

return true;

253

}

254

255

/*

309

}

310

gpgme_recipient_t recipient;

311

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

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;

322

320

}

323

321

}

324

322

}

516

514

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

517

515

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

518

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

/* Called when a Mandos server is found */

520

521

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

521

522

AvahiIfIndex if_index,

522

523

int af){

523

int ret, tcp_sd;

524

int ret, tcp_sd = -1;

524

525

ssize_t sret;

525

526

union {

526

527

struct sockaddr_in in;

536

537

gnutls_session_t session;

537

538

int pf; /* Protocol family */

538

539

540

if(quit_now){

541

return -1;

542

}

543

539

544

switch(af){

540

545

case AF_INET6:

541

546

pf = PF_INET6;

561

566

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

567

if(tcp_sd < 0){

563

568

perror("socket");

564

return -1;

569

retval = -1;

570

goto mandos_end;

571

}

572

573

if(quit_now){

574

goto mandos_end;

565

575

}

566

576

567

577

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

574

584

}

575

585

if(ret < 0 ){

576

586

perror("inet_pton");

577

return -1;

587

retval = -1;

588

goto mandos_end;

578

589

}

579

590

if(ret == 0){

580

591

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

581

return -1;

592

retval = -1;

593

goto mandos_end;

582

594

}

583

595

if(af == AF_INET6){

584

596

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

591

603

if(if_index == AVAHI_IF_UNSPEC){

592

604

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

593

605

" without a network interface\n");

594

return -1;

606

retval = -1;

607

goto mandos_end;

595

608

}

596

609

/* Set the network interface number as scope */

597

610

to.in6.sin6_scope_id = (uint32_t)if_index;

602

615

-Wunreachable-code */

603

616

}

604

617

618

if(quit_now){

619

goto mandos_end;

620

}

621

605

622

if(debug){

606

623

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

607

624

char interface[IF_NAMESIZE];

634

651

}

635

652

}

636

653

654

if(quit_now){

655

goto mandos_end;

656

}

657

637

658

if(af == AF_INET6){

638

659

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

639

660

} else {

641

662

}

642

663

if(ret < 0){

643

664

perror("connect");

644

return -1;

665

retval = -1;

666

goto mandos_end;

667

}

668

669

if(quit_now){

670

goto mandos_end;

645

671

}

646

672

647

673

const char *out = mandos_protocol_version;

666

692

break;

667

693

}

668

694

}

695

696

if(quit_now){

697

goto mandos_end;

698

}

669

699

}

670

700

671

701

if(debug){

672

702

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

673

703

}

674

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

675

709

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

710

711

if(quit_now){

712

goto mandos_end;

713

}

714

677

715

do{

678

716

ret = gnutls_handshake(session);

717

if(quit_now){

718

goto mandos_end;

719

}

679

720

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

680

721

681

722

if(ret != GNUTLS_E_SUCCESS){

695

736

}

696

737

697

738

while(true){

739

740

if(quit_now){

741

goto mandos_end;

742

}

743

698

744

buffer_capacity = incbuffer(&buffer, buffer_length,

699

745

buffer_capacity);

700

746

if(buffer_capacity == 0){

703

749

goto mandos_end;

704

750

}

705

751

752

if(quit_now){

753

goto mandos_end;

754

}

755

706

756

sret = gnutls_record_recv(session, buffer+buffer_length,

707

757

BUFFER_SIZE);

708

758

if(sret == 0){

716

766

case GNUTLS_E_REHANDSHAKE:

717

767

do{

718

768

ret = gnutls_handshake(session);

769

770

if(quit_now){

771

goto mandos_end;

772

}

719

773

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

720

774

if(ret < 0){

721

775

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

740

794

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

741

795

}

742

796

797

if(quit_now){

798

goto mandos_end;

799

}

800

743

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

744

802

803

if(quit_now){

804

goto mandos_end;

805

}

806

745

807

if(buffer_length > 0){

746

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

809

buffer_length,

749

811

if(decrypted_buffer_size >= 0){

750

812

written = 0;

751

813

while(written < (size_t) decrypted_buffer_size){

814

if(quit_now){

815

goto mandos_end;

816

}

817

752

818

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

753

819

(size_t)decrypted_buffer_size - written,

754

820

stdout);

774

840

775

841

mandos_end:

776

842

free(buffer);

777

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

843

if(tcp_sd >= 0){

844

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

845

}

778

846

if(ret == -1){

779

847

perror("close");

780

848

}

781

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

852

}

782

853

return retval;

783

854

}

784

855

801

872

/* Called whenever a service has been resolved successfully or

802

873

timed out */

803

874

875

if(quit_now){

876

return;

877

}

878

804

879

switch(event){

805

880

default:

806

881

case AVAHI_RESOLVER_FAILURE:

843

918

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

844

919

is removed from the LAN */

845

920

921

if(quit_now){

922

return;

923

}

924

846

925

switch(event){

847

926

default:

848

927

case AVAHI_BROWSER_FAILURE:

877

956

}

878

957

}

879

958

880

sig_atomic_t quit_now = 0;

881

882

959

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

883

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

960

static void handle_sigterm(int sig){

884

961

if(quit_now){

885

962

return;

886

963

}

887

964

quit_now = 1;

965

signal_received = sig;

888

966

int old_errno = errno;

889

967

if(mc.simple_poll != NULL){

890

968

avahi_simple_poll_quit(mc.simple_poll);

901

979

int exitcode = EXIT_SUCCESS;

902

980

const char *interface = "eth0";

903

981

struct ifreq network;

904

int sd;

982

int sd = -1;

983

bool take_down_interface = false;

905

984

uid_t uid;

906

985

gid_t gid;

907

986

char *connect_to = NULL;

1050

1129

exitcode = EXIT_FAILURE;

1051

1130

goto end;

1052

1131

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

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

}

1059

1175

1060

1176

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

1061

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

1062

1189

#ifdef __linux__

1063

1190

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

1191

messages to mess up the prompt */

1101

1228

}

1102

1229

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

1103

1230

network.ifr_flags |= IFF_UP;

1231

take_down_interface = true;

1104

1232

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

1105

1233

if(ret == -1){

1234

take_down_interface = false;

1106

1235

perror("ioctl SIOCSIFFLAGS");

1107

1236

exitcode = EXIT_FAILURE;

1108

1237

#ifdef __linux__

1130

1259

perror("nanosleep");

1131

1260

}

1132

1261

}

1133

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

1134

if(ret == -1){

1135

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

}

1136

1268

}

1137

1269

#ifdef __linux__

1138

1270

if(restore_loglevel){

1145

1277

#endif /* __linux__ */

1146

1278

}

1147

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1148

1284

uid = getuid();

1149

1285

gid = getgid();

1150

1286

1159

1295

perror("setuid");

1160

1296

}

1161

1297

1298

if(quit_now){

1299

goto end;

1300

}

1301

1162

1302

ret = init_gnutls_global(pubkey, seckey);

1163

1303

if(ret == -1){

1164

1304

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

1168

1308

gnutls_initialized = true;

1169

1309

}

1170

1310

1311

if(quit_now){

1312

goto end;

1313

}

1314

1315

tempdir_created = true;

1171

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1172

1318

perror("mkdtemp");

1173

1319

goto end;

1174

1320

}

1175

tempdir_created = true;

1321

1322

if(quit_now){

1323

goto end;

1324

}

1176

1325

1177

1326

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

1178

1327

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

1182

1331

gpgme_initialized = true;

1183

1332

}

1184

1333

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1334

if(quit_now){

1335

goto end;

1192

1336

}

1193

1337

1194

1338

if(connect_to != NULL){

1200

1344

exitcode = EXIT_FAILURE;

1201

1345

goto end;

1202

1346

}

1347

1348

if(quit_now){

1349

goto end;

1350

}

1351

1203

1352

uint16_t port;

1204

1353

errno = 0;

1205

1354

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

1209

1358

exitcode = EXIT_FAILURE;

1210

1359

goto end;

1211

1360

}

1361

1362

if(quit_now){

1363

goto end;

1364

}

1365

1212

1366

port = (uint16_t)tmpmax;

1213

1367

*address = '\0';

1214

1368

address = connect_to;

1219

1373

} else {

1220

1374

af = AF_INET;

1221

1375

}

1376

1377

if(quit_now){

1378

goto end;

1379

}

1380

1222

1381

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

1223

1382

if(ret < 0){

1224

1383

exitcode = EXIT_FAILURE;

1227

1386

}

1228

1387

goto end;

1229

1388

}

1230

1389

1390

if(quit_now){

1391

goto end;

1392

}

1393

1231

1394

{

1232

1395

AvahiServerConfig config;

1233

1396

/* Do not publish any local Zeroconf records */

1254

1417

goto end;

1255

1418

}

1256

1419

1420

if(quit_now){

1421

goto end;

1422

}

1423

1257

1424

/* Create the Avahi service browser */

1258

1425

sb = avahi_s_service_browser_new(mc.server, if_index,

1259

1426

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1265

1432

goto end;

1266

1433

}

1267

1434

1435

if(quit_now){

1436

goto end;

1437

}

1438

1268

1439

/* Run the main loop */

1269

1440

1270

1441

if(debug){

1299

1470

gpgme_release(mc.ctx);

1300

1471

}

1301

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

1302

1491

/* Removes the temp directory used by GPGME */

1303

1492

if(tempdir_created){

1304

1493

DIR *d;

1343

1532

}

1344

1533

}

1345

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

1346

1545

return exitcode;

1347

1546

}