/mandos/trunk : revision 371

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

46

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

47

srand(), strtof() */

48

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

49

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

50

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

72

*/

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

getuid(), getgid(), seteuid(),

75

setgid(), pause() */

75

setgid() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <iso646.h> /* not, or, and */

78

#include <argp.h> /* struct argp_option, error_t, struct

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

85

88

86

#ifdef __linux__

89

87

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

546

544

struct sockaddr_in6 in6;

547

545

} to;

548

546

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

547

char *decrypted_buffer;

550

548

size_t buffer_length = 0;

551

549

size_t buffer_capacity = 0;

552

550

size_t written;

553

int retval = -1;

551

int retval = 0;

554

552

gnutls_session_t session;

555

553

int pf; /* Protocol family */

556

554

557

errno = 0;

558

559

555

if(quit_now){

560

errno = EINTR;

561

556

return -1;

562

557

}

563

558

570

565

break;

571

566

default:

572

567

fprintf(stderr, "Bad address family: %d\n", af);

573

errno = EINVAL;

574

568

return -1;

575

569

}

576

570

586

580

587

581

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

582

if(tcp_sd < 0){

589

int e = errno;

590

583

perror("socket");

591

errno = e;

584

retval = -1;

592

585

goto mandos_end;

593

586

}

594

587

595

588

if(quit_now){

596

errno = EINTR;

589

retval = -1;

597

590

goto mandos_end;

598

591

}

599

592

606

599

ret = inet_pton(af, ip, &to.in.sin_addr);

607

600

}

608

601

if(ret < 0 ){

609

int e = errno;

610

602

perror("inet_pton");

611

errno = e;

603

retval = -1;

612

604

goto mandos_end;

613

605

}

614

606

if(ret == 0){

615

int e = errno;

616

607

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

617

errno = e;

608

retval = -1;

618

609

goto mandos_end;

619

610

}

620

611

if(af == AF_INET6){

628

619

if(if_index == AVAHI_IF_UNSPEC){

629

620

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

630

621

" without a network interface\n");

631

errno = EINVAL;

622

retval = -1;

632

623

goto mandos_end;

633

624

}

634

625

/* Set the network interface number as scope */

641

632

}

642

633

643

634

if(quit_now){

644

errno = EINTR;

635

retval = -1;

645

636

goto mandos_end;

646

637

}

647

638

678

669

}

679

670

680

671

if(quit_now){

681

errno = EINTR;

672

retval = -1;

682

673

goto mandos_end;

683

674

}

684

675

688

679

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

689

680

}

690

681

if(ret < 0){

691

int e = errno;

692

682

perror("connect");

693

errno = e;

683

retval = -1;

694

684

goto mandos_end;

695

685

}

696

686

697

687

if(quit_now){

698

errno = EINTR;

688

retval = -1;

699

689

goto mandos_end;

700

690

}

701

691

706

696

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

707

697

out_size - written));

708

698

if(ret == -1){

709

int e = errno;

710

699

perror("write");

711

errno = e;

700

retval = -1;

712

701

goto mandos_end;

713

702

}

714

703

written += (size_t)ret;

724

713

}

725

714

726

715

if(quit_now){

727

errno = EINTR;

716

retval = -1;

728

717

goto mandos_end;

729

718

}

730

719

}

734

723

}

735

724

736

725

if(quit_now){

737

errno = EINTR;

726

retval = -1;

738

727

goto mandos_end;

739

728

}

740

729

741

730

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

731

743

732

if(quit_now){

744

errno = EINTR;

733

retval = -1;

745

734

goto mandos_end;

746

735

}

747

736

748

737

do {

749

738

ret = gnutls_handshake(session);

750

739

if(quit_now){

751

errno = EINTR;

740

retval = -1;

752

741

goto mandos_end;

753

742

}

754

743

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

758

747

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

759

748

gnutls_perror(ret);

760

749

}

761

errno = EPROTO;

750

retval = -1;

762

751

goto mandos_end;

763

752

}

764

753

772

761

while(true){

773

762

774

763

if(quit_now){

775

errno = EINTR;

764

retval = -1;

776

765

goto mandos_end;

777

766

}

778

767

779

768

buffer_capacity = incbuffer(&buffer, buffer_length,

780

769

buffer_capacity);

781

770

if(buffer_capacity == 0){

782

int e = errno;

783

771

perror("incbuffer");

784

errno = e;

772

retval = -1;

785

773

goto mandos_end;

786

774

}

787

775

788

776

if(quit_now){

789

errno = EINTR;

777

retval = -1;

790

778

goto mandos_end;

791

779

}

792

780

805

793

ret = gnutls_handshake(session);

806

794

807

795

if(quit_now){

808

errno = EINTR;

796

retval = -1;

809

797

goto mandos_end;

810

798

}

811

799

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

812

800

if(ret < 0){

813

801

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

814

802

gnutls_perror(ret);

815

errno = EPROTO;

803

retval = -1;

816

804

goto mandos_end;

817

805

}

818

806

break;

819

807

default:

820

808

fprintf(stderr, "Unknown error while reading data from"

821

809

" encrypted session with Mandos server\n");

810

retval = -1;

822

811

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

812

goto mandos_end;

825

813

}

826

814

} else {

833

821

}

834

822

835

823

if(quit_now){

836

errno = EINTR;

824

retval = -1;

837

825

goto mandos_end;

838

826

}

839

827

840

828

do {

841

829

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

830

if(quit_now){

843

errno = EINTR;

831

retval = -1;

844

832

goto mandos_end;

845

833

}

846

834

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

855

843

written = 0;

856

844

while(written < (size_t) decrypted_buffer_size){

857

845

if(quit_now){

858

errno = EINTR;

846

retval = -1;

859

847

goto mandos_end;

860

848

}

861

849

863

851

(size_t)decrypted_buffer_size - written,

864

852

stdout);

865

853

if(ret == 0 and ferror(stdout)){

866

int e = errno;

867

854

if(debug){

868

855

fprintf(stderr, "Error writing encrypted data: %s\n",

869

856

strerror(errno));

870

857

}

871

errno = e;

872

goto mandos_end;

858

retval = -1;

859

break;

873

860

}

874

861

written += (size_t)ret;

875

862

}

876

retval = 0;

863

free(decrypted_buffer);

864

} else {

865

retval = -1;

877

866

}

867

} else {

868

retval = -1;

878

869

}

879

870

880

871

/* Shutdown procedure */

881

872

882

873

mandos_end:

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

874

free(buffer);

875

if(tcp_sd >= 0){

876

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

877

}

878

if(ret == -1){

879

perror("close");

880

}

881

gnutls_deinit(session);

882

if(quit_now){

883

retval = -1;

902

884

}

903

885

return retval;

904

886

}

1102

1084

.arg = "SECONDS",

1103

1085

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

1104

1086

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

{ .name = "help", .key = '?',

1109

.doc = "Give this help list", .group = -1 },

1110

{ .name = "usage", .key = -3,

1111

.doc = "Give a short usage message", .group = -1 },

1112

{ .name = "version", .key = 'V',

1113

.doc = "Print program version", .group = -1 },

1114

1087

{ .name = NULL }

1115

1088

};

1116

1089

1117

1090

error_t parse_opt(int key, char *arg,

1118

1091

struct argp_state *state){

1119

errno = 0;

1120

1092

switch(key){

1121

1093

case 128: /* --debug */

1122

1094

debug = true;

1138

1110

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

1139

1111

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

1140

1112

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

1141

argp_error(state, "Bad number of DH bits");

1113

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

1114

exit(EXIT_FAILURE);

1142

1115

}

1143

1116

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1144

1117

break;

1149

1122

errno = 0;

1150

1123

delay = strtof(arg, &tmp);

1151

1124

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

1152

argp_error(state, "Bad delay");

1125

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

1126

exit(EXIT_FAILURE);

1153

1127

}

1154

1128

break;

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

case '?': /* --help */

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

case 'V': /* --version */

1166

fprintf(state->out_stream, "%s\n", argp_program_version);

1167

exit(argp_err_exit_status);

1129

case ARGP_KEY_ARG:

1130

argp_usage(state);

1131

case ARGP_KEY_END:

1168

1132

break;

1169

1133

default:

1170

1134

return ARGP_ERR_UNKNOWN;

1171

1135

}

1172

return errno;

1136

return 0;

1173

1137

}

1174

1138

1175

1139

struct argp argp = { .options = options, .parser = parse_opt,

1176

1140

.args_doc = "",

1177

1141

.doc = "Mandos client -- Get and decrypt"

1178

1142

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

1143

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1144

if(ret == ARGP_ERR_UNKNOWN){

1145

fprintf(stderr, "Unknown error while parsing arguments\n");

1146

exitcode = EXIT_FAILURE;

1192

1147

goto end;

1193

1148

}

1194

1149

}

1204

1159

mc.simple_poll = avahi_simple_poll_new();

1205

1160

if(mc.simple_poll == NULL){

1206

1161

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1207

exitcode = EX_UNAVAILABLE;

1162

exitcode = EXIT_FAILURE;

1208

1163

goto end;

1209

1164

}

1210

1165

1212

1167

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

1213

1168

if(ret == -1){

1214

1169

perror("sigaddset");

1215

exitcode = EX_OSERR;

1170

exitcode = EXIT_FAILURE;

1216

1171

goto end;

1217

1172

}

1218

1173

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

1219

1174

if(ret == -1){

1220

1175

perror("sigaddset");

1221

exitcode = EX_OSERR;

1176

exitcode = EXIT_FAILURE;

1222

1177

goto end;

1223

1178

}

1224

1179

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

1225

1180

if(ret == -1){

1226

1181

perror("sigaddset");

1227

exitcode = EX_OSERR;

1182

exitcode = EXIT_FAILURE;

1228

1183

goto end;

1229

1184

}

1230

1185

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

1234

1189

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

1235

1190

if(ret == -1){

1236

1191

perror("sigaction");

1237

return EX_OSERR;

1192

return EXIT_FAILURE;

1238

1193

}

1239

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1195

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

1241

1196

if(ret == -1){

1242

1197

perror("sigaction");

1243

exitcode = EX_OSERR;

1198

exitcode = EXIT_FAILURE;

1244

1199

goto end;

1245

1200

}

1246

1201

}

1247

1202

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

1248

1203

if(ret == -1){

1249

1204

perror("sigaction");

1250

return EX_OSERR;

1205

return EXIT_FAILURE;

1251

1206

}

1252

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1208

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

1254

1209

if(ret == -1){

1255

1210

perror("sigaction");

1256

exitcode = EX_OSERR;

1211

exitcode = EXIT_FAILURE;

1257

1212

goto end;

1258

1213

}

1259

1214

}

1260

1215

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

1261

1216

if(ret == -1){

1262

1217

perror("sigaction");

1263

return EX_OSERR;

1218

return EXIT_FAILURE;

1264

1219

}

1265

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1221

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

1267

1222

if(ret == -1){

1268

1223

perror("sigaction");

1269

exitcode = EX_OSERR;

1224

exitcode = EXIT_FAILURE;

1270

1225

goto end;

1271

1226

}

1272

1227

}

1276

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1232

if(if_index == 0){

1278

1233

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

1279

exitcode = EX_UNAVAILABLE;

1234

exitcode = EXIT_FAILURE;

1280

1235

goto end;

1281

1236

}

1282

1237

1293

1248

1294

1249

#ifdef __linux__

1295

1250

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

messages about the network interface to mess up the prompt */

1251

messages to mess up the prompt */

1297

1252

ret = klogctl(8, NULL, 5);

1298

1253

bool restore_loglevel = true;

1299

1254

if(ret == -1){

1305

1260

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1261

if(sd < 0){

1307

1262

perror("socket");

1308

exitcode = EX_OSERR;

1263

exitcode = EXIT_FAILURE;

1309

1264

#ifdef __linux__

1310

1265

if(restore_loglevel){

1311

1266

ret = klogctl(7, NULL, 0);

1334

1289

}

1335

1290

}

1336

1291

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1292

exitcode = EXIT_FAILURE;

1338

1293

/* Lower privileges */

1339

1294

errno = 0;

1340

1295

ret = seteuid(uid);

1350

1305

if(ret == -1){

1351

1306

take_down_interface = false;

1352

1307

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1308

exitcode = EXIT_FAILURE;

1354

1309

#ifdef __linux__

1355

1310

if(restore_loglevel){

1356

1311

ret = klogctl(7, NULL, 0);

1422

1377

ret = init_gnutls_global(pubkey, seckey);

1423

1378

if(ret == -1){

1424

1379

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

1425

exitcode = EX_UNAVAILABLE;

1380

exitcode = EXIT_FAILURE;

1426

1381

goto end;

1427

1382

} else {

1428

1383

gnutls_initialized = true;

1445

1400

1446

1401

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

1447

1402

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

1448

exitcode = EX_UNAVAILABLE;

1403

exitcode = EXIT_FAILURE;

1449

1404

goto end;

1450

1405

} else {

1451

1406

gpgme_initialized = true;

1461

1416

char *address = strrchr(connect_to, ':');

1462

1417

if(address == NULL){

1463

1418

fprintf(stderr, "No colon in address\n");

1464

exitcode = EX_USAGE;

1419

exitcode = EXIT_FAILURE;

1465

1420

goto end;

1466

1421

}

1467

1422

1475

1430

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

1476

1431

or tmpmax != (uint16_t)tmpmax){

1477

1432

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

1478

exitcode = EX_USAGE;

1433

exitcode = EXIT_FAILURE;

1479

1434

goto end;

1480

1435

}

1481

1436

1500

1455

1501

1456

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

1502

1457

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1458

exitcode = EXIT_FAILURE;

1522

1459

} else {

1523

1460

exitcode = EXIT_SUCCESS;

1524

1461

}

1551

1488

if(mc.server == NULL){

1552

1489

fprintf(stderr, "Failed to create Avahi server: %s\n",

1553

1490

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1491

exitcode = EXIT_FAILURE;

1555

1492

goto end;

1556

1493

}

1557

1494

1566

1503

if(sb == NULL){

1567

1504

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

1568

1505

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1506

exitcode = EXIT_FAILURE;

1570

1507

goto end;

1571

1508

}

1572

1509

1621

1558

if(ret == -1){

1622

1559

perror("ioctl SIOCGIFFLAGS");

1623

1560

} else if(network.ifr_flags & IFF_UP) {

1624

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

1561

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

1625

1562

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

1626

1563

if(ret == -1){

1627

1564

perror("ioctl SIOCSIFFLAGS");

1687

1624

if(quit_now){

1688

1625

sigemptyset(&old_sigterm_action.sa_mask);

1689

1626

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1627

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

1693

1628

if(ret == -1){

1694

1629

perror("sigaction");

1695

1630

}

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1631

raise(signal_received);

1704

1632

}

1705

1633

1706

1634

return exitcode;