/mandos/trunk : revision 393

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(), abort() */

48

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

49

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

50

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

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() */

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;

592

584

goto mandos_end;

593

585

}

594

586

595

587

if(quit_now){

596

errno = EINTR;

597

588

goto mandos_end;

598

589

}

599

590

606

597

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

607

598

}

608

599

if(ret < 0 ){

609

int e = errno;

610

600

perror("inet_pton");

611

errno = e;

612

601

goto mandos_end;

613

602

}

614

603

if(ret == 0){

615

int e = errno;

616

604

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

617

errno = e;

618

605

goto mandos_end;

619

606

}

620

607

if(af == AF_INET6){

628

615

if(if_index == AVAHI_IF_UNSPEC){

629

616

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

630

617

" without a network interface\n");

631

errno = EINVAL;

632

618

goto mandos_end;

633

619

}

634

620

/* Set the network interface number as scope */

641

627

}

642

628

643

629

if(quit_now){

644

errno = EINTR;

645

630

goto mandos_end;

646

631

}

647

632

678

663

}

679

664

680

665

if(quit_now){

681

errno = EINTR;

682

666

goto mandos_end;

683

667

}

684

668

688

672

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

689

673

}

690

674

if(ret < 0){

691

int e = errno;

692

675

perror("connect");

693

errno = e;

694

676

goto mandos_end;

695

677

}

696

678

697

679

if(quit_now){

698

errno = EINTR;

699

680

goto mandos_end;

700

681

}

701

682

706

687

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

707

688

out_size - written));

708

689

if(ret == -1){

709

int e = errno;

710

690

perror("write");

711

errno = e;

712

691

goto mandos_end;

713

692

}

714

693

written += (size_t)ret;

724

703

}

725

704

726

705

if(quit_now){

727

errno = EINTR;

728

706

goto mandos_end;

729

707

}

730

708

}

734

712

}

735

713

736

714

if(quit_now){

737

errno = EINTR;

738

715

goto mandos_end;

739

716

}

740

717

741

718

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

719

743

720

if(quit_now){

744

errno = EINTR;

745

721

goto mandos_end;

746

722

}

747

723

748

724

do {

749

725

ret = gnutls_handshake(session);

750

726

if(quit_now){

751

errno = EINTR;

752

727

goto mandos_end;

753

728

}

754

729

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

758

733

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

759

734

gnutls_perror(ret);

760

735

}

761

errno = EPROTO;

762

736

goto mandos_end;

763

737

}

764

738

772

746

while(true){

773

747

774

748

if(quit_now){

775

errno = EINTR;

776

749

goto mandos_end;

777

750

}

778

751

779

752

buffer_capacity = incbuffer(&buffer, buffer_length,

780

753

buffer_capacity);

781

754

if(buffer_capacity == 0){

782

int e = errno;

783

755

perror("incbuffer");

784

errno = e;

785

756

goto mandos_end;

786

757

}

787

758

788

759

if(quit_now){

789

errno = EINTR;

790

760

goto mandos_end;

791

761

}

792

762

805

775

ret = gnutls_handshake(session);

806

776

807

777

if(quit_now){

808

errno = EINTR;

809

778

goto mandos_end;

810

779

}

811

780

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

812

781

if(ret < 0){

813

782

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

814

783

gnutls_perror(ret);

815

errno = EPROTO;

816

784

goto mandos_end;

817

785

}

818

786

break;

820

788

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

821

789

" encrypted session with Mandos server\n");

822

790

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

791

goto mandos_end;

825

792

}

826

793

} else {

833

800

}

834

801

835

802

if(quit_now){

836

errno = EINTR;

837

803

goto mandos_end;

838

804

}

839

805

840

806

do {

841

807

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

808

if(quit_now){

843

errno = EINTR;

844

809

goto mandos_end;

845

810

}

846

811

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

855

820

written = 0;

856

821

while(written < (size_t) decrypted_buffer_size){

857

822

if(quit_now){

858

errno = EINTR;

859

823

goto mandos_end;

860

824

}

861

825

863

827

(size_t)decrypted_buffer_size - written,

864

828

stdout);

865

829

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

866

int e = errno;

867

830

if(debug){

868

831

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

869

832

strerror(errno));

870

833

}

871

errno = e;

872

834

goto mandos_end;

873

835

}

874

836

written += (size_t)ret;

880

842

/* Shutdown procedure */

881

843

882

844

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;

845

free(decrypted_buffer);

846

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

850

if(ret == -1){

851

perror("close");

852

}

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

902

856

}

903

857

return retval;

904

858

}

1102

1056

.arg = "SECONDS",

1103

1057

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

1104

1058

.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

1059

{ .name = NULL }

1115

1060

};

1116

1061

1117

1062

error_t parse_opt(int key, char *arg,

1118

1063

struct argp_state *state){

1119

errno = 0;

1120

1064

switch(key){

1121

1065

case 128: /* --debug */

1122

1066

debug = true;

1138

1082

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

1139

1083

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

1140

1084

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

1141

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

1085

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

1086

exit(EXIT_FAILURE);

1142

1087

}

1143

1088

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

1144

1089

break;

1149

1094

errno = 0;

1150

1095

delay = strtof(arg, &tmp);

1151

1096

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

1152

argp_error(state, "Bad delay");

1097

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

1098

exit(EXIT_FAILURE);

1153

1099

}

1154

1100

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);

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

case ARGP_KEY_END:

1168

1104

break;

1169

1105

default:

1170

1106

return ARGP_ERR_UNKNOWN;

1171

1107

}

1172

return errno;

1108

return 0;

1173

1109

}

1174

1110

1175

1111

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

1176

1112

.args_doc = "",

1177

1113

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

1178

1114

" 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;

1115

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

1116

if(ret == ARGP_ERR_UNKNOWN){

1117

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

1118

exitcode = EXIT_FAILURE;

1192

1119

goto end;

1193

1120

}

1194

1121

}

1204

1131

mc.simple_poll = avahi_simple_poll_new();

1205

1132

if(mc.simple_poll == NULL){

1206

1133

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

1207

exitcode = EX_UNAVAILABLE;

1134

exitcode = EXIT_FAILURE;

1208

1135

goto end;

1209

1136

}

1210

1137

1212

1139

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

1213

1140

if(ret == -1){

1214

1141

perror("sigaddset");

1215

exitcode = EX_OSERR;

1142

exitcode = EXIT_FAILURE;

1216

1143

goto end;

1217

1144

}

1218

1145

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

1219

1146

if(ret == -1){

1220

1147

perror("sigaddset");

1221

exitcode = EX_OSERR;

1148

exitcode = EXIT_FAILURE;

1222

1149

goto end;

1223

1150

}

1224

1151

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

1225

1152

if(ret == -1){

1226

1153

perror("sigaddset");

1227

exitcode = EX_OSERR;

1154

exitcode = EXIT_FAILURE;

1228

1155

goto end;

1229

1156

}

1230

1157

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

1234

1161

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

1235

1162

if(ret == -1){

1236

1163

perror("sigaction");

1237

return EX_OSERR;

1164

return EXIT_FAILURE;

1238

1165

}

1239

1166

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1167

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

1241

1168

if(ret == -1){

1242

1169

perror("sigaction");

1243

exitcode = EX_OSERR;

1170

exitcode = EXIT_FAILURE;

1244

1171

goto end;

1245

1172

}

1246

1173

}

1247

1174

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

1248

1175

if(ret == -1){

1249

1176

perror("sigaction");

1250

return EX_OSERR;

1177

return EXIT_FAILURE;

1251

1178

}

1252

1179

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1180

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

1254

1181

if(ret == -1){

1255

1182

perror("sigaction");

1256

exitcode = EX_OSERR;

1183

exitcode = EXIT_FAILURE;

1257

1184

goto end;

1258

1185

}

1259

1186

}

1260

1187

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

1261

1188

if(ret == -1){

1262

1189

perror("sigaction");

1263

return EX_OSERR;

1190

return EXIT_FAILURE;

1264

1191

}

1265

1192

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1193

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

1267

1194

if(ret == -1){

1268

1195

perror("sigaction");

1269

exitcode = EX_OSERR;

1196

exitcode = EXIT_FAILURE;

1270

1197

goto end;

1271

1198

}

1272

1199

}

1276

1203

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1204

if(if_index == 0){

1278

1205

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

1279

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1280

1207

goto end;

1281

1208

}

1282

1209

1293

1220

1294

1221

#ifdef __linux__

1295

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1223

messages to mess up the prompt */

1297

1224

ret = klogctl(8, NULL, 5);

1298

1225

bool restore_loglevel = true;

1299

1226

if(ret == -1){

1305

1232

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1233

if(sd < 0){

1307

1234

perror("socket");

1308

exitcode = EX_OSERR;

1235

exitcode = EXIT_FAILURE;

1309

1236

#ifdef __linux__

1310

1237

if(restore_loglevel){

1311

1238

ret = klogctl(7, NULL, 0);

1334

1261

}

1335

1262

}

1336

1263

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1264

exitcode = EXIT_FAILURE;

1338

1265

/* Lower privileges */

1339

1266

errno = 0;

1340

1267

ret = seteuid(uid);

1350

1277

if(ret == -1){

1351

1278

take_down_interface = false;

1352

1279

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1280

exitcode = EXIT_FAILURE;

1354

1281

#ifdef __linux__

1355

1282

if(restore_loglevel){

1356

1283

ret = klogctl(7, NULL, 0);

1422

1349

ret = init_gnutls_global(pubkey, seckey);

1423

1350

if(ret == -1){

1424

1351

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

1425

exitcode = EX_UNAVAILABLE;

1352

exitcode = EXIT_FAILURE;

1426

1353

goto end;

1427

1354

} else {

1428

1355

gnutls_initialized = true;

1445

1372

1446

1373

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

1447

1374

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

1448

exitcode = EX_UNAVAILABLE;

1375

exitcode = EXIT_FAILURE;

1449

1376

goto end;

1450

1377

} else {

1451

1378

gpgme_initialized = true;

1461

1388

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

1462

1389

if(address == NULL){

1463

1390

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

1464

exitcode = EX_USAGE;

1391

exitcode = EXIT_FAILURE;

1465

1392

goto end;

1466

1393

}

1467

1394

1475

1402

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

1476

1403

or tmpmax != (uint16_t)tmpmax){

1477

1404

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

1478

exitcode = EX_USAGE;

1405

exitcode = EXIT_FAILURE;

1479

1406

goto end;

1480

1407

}

1481

1408

1500

1427

1501

1428

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

1502

1429

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

}

1430

exitcode = EXIT_FAILURE;

1522

1431

} else {

1523

1432

exitcode = EXIT_SUCCESS;

1524

1433

}

1551

1460

if(mc.server == NULL){

1552

1461

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

1553

1462

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1463

exitcode = EXIT_FAILURE;

1555

1464

goto end;

1556

1465

}

1557

1466

1566

1475

if(sb == NULL){

1567

1476

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

1568

1477

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1478

exitcode = EXIT_FAILURE;

1570

1479

goto end;

1571

1480

}

1572

1481

1621

1530

if(ret == -1){

1622

1531

perror("ioctl SIOCGIFFLAGS");

1623

1532

} else if(network.ifr_flags & IFF_UP) {

1624

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

1533

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

1625

1534

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

1626

1535

if(ret == -1){

1627

1536

perror("ioctl SIOCSIFFLAGS");