/mandos/trunk : revision 412

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, EXIT_FAILURE,

47

srand(), strtof(), abort() */

46

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

47

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 */

85

87

86

88

#ifdef __linux__

87

89

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

552

554

gnutls_session_t session;

553

555

int pf; /* Protocol family */

554

556

557

errno = 0;

558

555

559

if(quit_now){

560

errno = EINTR;

556

561

return -1;

557

562

}

558

563

565

570

break;

566

571

default:

567

572

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

573

errno = EINVAL;

568

574

return -1;

569

575

}

570

576

580

586

581

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

588

if(tcp_sd < 0){

589

int e = errno;

583

590

perror("socket");

591

errno = e;

584

592

goto mandos_end;

585

593

}

586

594

587

595

if(quit_now){

596

errno = EINTR;

588

597

goto mandos_end;

589

598

}

590

599

597

606

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

598

607

}

599

608

if(ret < 0 ){

609

int e = errno;

600

610

perror("inet_pton");

611

errno = e;

601

612

goto mandos_end;

602

613

}

603

614

if(ret == 0){

615

int e = errno;

604

616

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

617

errno = e;

605

618

goto mandos_end;

606

619

}

607

620

if(af == AF_INET6){

615

628

if(if_index == AVAHI_IF_UNSPEC){

616

629

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

617

630

" without a network interface\n");

631

errno = EINVAL;

618

632

goto mandos_end;

619

633

}

620

634

/* Set the network interface number as scope */

627

641

}

628

642

629

643

if(quit_now){

644

errno = EINTR;

630

645

goto mandos_end;

631

646

}

632

647

663

678

}

664

679

665

680

if(quit_now){

681

errno = EINTR;

666

682

goto mandos_end;

667

683

}

668

684

672

688

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

673

689

}

674

690

if(ret < 0){

691

int e = errno;

675

692

perror("connect");

693

errno = e;

676

694

goto mandos_end;

677

695

}

678

696

679

697

if(quit_now){

698

errno = EINTR;

680

699

goto mandos_end;

681

700

}

682

701

687

706

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

688

707

out_size - written));

689

708

if(ret == -1){

709

int e = errno;

690

710

perror("write");

711

errno = e;

691

712

goto mandos_end;

692

713

}

693

714

written += (size_t)ret;

703

724

}

704

725

705

726

if(quit_now){

727

errno = EINTR;

706

728

goto mandos_end;

707

729

}

708

730

}

712

734

}

713

735

714

736

if(quit_now){

737

errno = EINTR;

715

738

goto mandos_end;

716

739

}

717

740

718

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

742

720

743

if(quit_now){

744

errno = EINTR;

721

745

goto mandos_end;

722

746

}

723

747

724

748

do {

725

749

ret = gnutls_handshake(session);

726

750

if(quit_now){

751

errno = EINTR;

727

752

goto mandos_end;

728

753

}

729

754

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

733

758

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

734

759

gnutls_perror(ret);

735

760

}

761

errno = EPROTO;

736

762

goto mandos_end;

737

763

}

738

764

746

772

while(true){

747

773

748

774

if(quit_now){

775

errno = EINTR;

749

776

goto mandos_end;

750

777

}

751

778

752

779

buffer_capacity = incbuffer(&buffer, buffer_length,

753

780

buffer_capacity);

754

781

if(buffer_capacity == 0){

782

int e = errno;

755

783

perror("incbuffer");

784

errno = e;

756

785

goto mandos_end;

757

786

}

758

787

759

788

if(quit_now){

789

errno = EINTR;

760

790

goto mandos_end;

761

791

}

762

792

775

805

ret = gnutls_handshake(session);

776

806

777

807

if(quit_now){

808

errno = EINTR;

778

809

goto mandos_end;

779

810

}

780

811

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

781

812

if(ret < 0){

782

813

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

783

814

gnutls_perror(ret);

815

errno = EPROTO;

784

816

goto mandos_end;

785

817

}

786

818

break;

788

820

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

789

821

" encrypted session with Mandos server\n");

790

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

791

824

goto mandos_end;

792

825

}

793

826

} else {

800

833

}

801

834

802

835

if(quit_now){

836

errno = EINTR;

803

837

goto mandos_end;

804

838

}

805

839

806

840

do {

807

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

842

if(quit_now){

843

errno = EINTR;

809

844

goto mandos_end;

810

845

}

811

846

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

820

855

written = 0;

821

856

while(written < (size_t) decrypted_buffer_size){

822

857

if(quit_now){

858

errno = EINTR;

823

859

goto mandos_end;

824

860

}

825

861

827

863

(size_t)decrypted_buffer_size - written,

828

864

stdout);

829

865

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

866

int e = errno;

830

867

if(debug){

831

868

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

832

869

strerror(errno));

833

870

}

871

errno = e;

834

872

goto mandos_end;

835

873

}

836

874

written += (size_t)ret;

842

880

/* Shutdown procedure */

843

881

844

882

mandos_end:

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;

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;

856

902

}

857

903

return retval;

858

904

}

1056

1102

.arg = "SECONDS",

1057

1103

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

1058

1104

.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 },

1059

1114

{ .name = NULL }

1060

1115

};

1061

1116

1062

1117

error_t parse_opt(int key, char *arg,

1063

1118

struct argp_state *state){

1119

errno = 0;

1064

1120

switch(key){

1065

1121

case 128: /* --debug */

1066

1122

debug = true;

1082

1138

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

1083

1139

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

1084

1140

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

1085

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

1086

exit(EXIT_FAILURE);

1141

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

1087

1142

}

1088

1143

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

1089

1144

break;

1094

1149

errno = 0;

1095

1150

delay = strtof(arg, &tmp);

1096

1151

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

1097

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

1098

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

1099

1153

}

1100

1154

break;

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

case ARGP_KEY_END:

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);

1104

1168

break;

1105

1169

default:

1106

1170

return ARGP_ERR_UNKNOWN;

1107

1171

}

1108

return 0;

1172

return errno;

1109

1173

}

1110

1174

1111

1175

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

1112

1176

.args_doc = "",

1113

1177

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

1114

1178

" passwords from a Mandos server" };

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;

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;

1119

1192

goto end;

1120

1193

}

1121

1194

}

1131

1204

mc.simple_poll = avahi_simple_poll_new();

1132

1205

if(mc.simple_poll == NULL){

1133

1206

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

1134

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1135

1208

goto end;

1136

1209

}

1137

1210

1139

1212

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

1140

1213

if(ret == -1){

1141

1214

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1143

1216

goto end;

1144

1217

}

1145

1218

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

1146

1219

if(ret == -1){

1147

1220

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1149

1222

goto end;

1150

1223

}

1151

1224

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

1152

1225

if(ret == -1){

1153

1226

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1227

exitcode = EX_OSERR;

1155

1228

goto end;

1156

1229

}

1157

1230

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

1161

1234

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

1162

1235

if(ret == -1){

1163

1236

perror("sigaction");

1164

return EXIT_FAILURE;

1237

return EX_OSERR;

1165

1238

}

1166

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

1240

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

1168

1241

if(ret == -1){

1169

1242

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1243

exitcode = EX_OSERR;

1171

1244

goto end;

1172

1245

}

1173

1246

}

1174

1247

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

1175

1248

if(ret == -1){

1176

1249

perror("sigaction");

1177

return EXIT_FAILURE;

1250

return EX_OSERR;

1178

1251

}

1179

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

1253

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

1181

1254

if(ret == -1){

1182

1255

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1256

exitcode = EX_OSERR;

1184

1257

goto end;

1185

1258

}

1186

1259

}

1187

1260

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

1188

1261

if(ret == -1){

1189

1262

perror("sigaction");

1190

return EXIT_FAILURE;

1263

return EX_OSERR;

1191

1264

}

1192

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

1266

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

1194

1267

if(ret == -1){

1195

1268

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1269

exitcode = EX_OSERR;

1197

1270

goto end;

1198

1271

}

1199

1272

}

1203

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

1277

if(if_index == 0){

1205

1278

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

1206

exitcode = EXIT_FAILURE;

1279

exitcode = EX_UNAVAILABLE;

1207

1280

goto end;

1208

1281

}

1209

1282

1220

1293

1221

1294

#ifdef __linux__

1222

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

messages to mess up the prompt */

1296

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

1224

1297

ret = klogctl(8, NULL, 5);

1225

1298

bool restore_loglevel = true;

1226

1299

if(ret == -1){

1232

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1306

if(sd < 0){

1234

1307

perror("socket");

1235

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1236

1309

#ifdef __linux__

1237

1310

if(restore_loglevel){

1238

1311

ret = klogctl(7, NULL, 0);

1261

1334

}

1262

1335

}

1263

1336

#endif /* __linux__ */

1264

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1265

1338

/* Lower privileges */

1266

1339

errno = 0;

1267

1340

ret = seteuid(uid);

1277

1350

if(ret == -1){

1278

1351

take_down_interface = false;

1279

1352

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1281

1354

#ifdef __linux__

1282

1355

if(restore_loglevel){

1283

1356

ret = klogctl(7, NULL, 0);

1349

1422

ret = init_gnutls_global(pubkey, seckey);

1350

1423

if(ret == -1){

1351

1424

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

1352

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1353

1426

goto end;

1354

1427

} else {

1355

1428

gnutls_initialized = true;

1372

1445

1373

1446

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

1374

1447

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

1375

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1376

1449

goto end;

1377

1450

} else {

1378

1451

gpgme_initialized = true;

1388

1461

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

1389

1462

if(address == NULL){

1390

1463

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

1391

exitcode = EXIT_FAILURE;

1464

exitcode = EX_USAGE;

1392

1465

goto end;

1393

1466

}

1394

1467

1402

1475

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

1403

1476

or tmpmax != (uint16_t)tmpmax){

1404

1477

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

1405

exitcode = EXIT_FAILURE;

1478

exitcode = EX_USAGE;

1406

1479

goto end;

1407

1480

}

1408

1481

1427

1500

1428

1501

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

1429

1502

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

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

}

1431

1522

} else {

1432

1523

exitcode = EXIT_SUCCESS;

1433

1524

}

1460

1551

if(mc.server == NULL){

1461

1552

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

1462

1553

avahi_strerror(error));

1463

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1464

1555

goto end;

1465

1556

}

1466

1557

1475

1566

if(sb == NULL){

1476

1567

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

1477

1568

avahi_strerror(avahi_server_errno(mc.server)));

1478

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1479

1570

goto end;

1480

1571

}

1481

1572

1530

1621

if(ret == -1){

1531

1622

perror("ioctl SIOCGIFFLAGS");

1532

1623

} else if(network.ifr_flags & IFF_UP) {

1533

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

1624

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

1534

1625

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

1535

1626

if(ret == -1){

1536

1627

perror("ioctl SIOCSIFFLAGS");