/mandos/trunk : revision 24.1.155

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() */

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() */

72

*/

73

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

74

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

75

setgid() */

75

setgid(), pause() */

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 */

85

87

86

88

#ifdef __linux__

87

89

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

142

144

.dh_bits = 1024, .priority = "SECURE256"

143

145

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

144

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

145

150

/*

146

151

* Make additional room in "buffer" for at least BUFFER_SIZE more

147

152

* bytes. "buffer_capacity" is how much is currently allocated,

476

481

/* GnuTLS session creation */

477

482

do {

478

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

479

487

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

480

488

if(ret != GNUTLS_E_SUCCESS){

481

489

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

486

494

const char *err;

487

495

do {

488

496

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

489

501

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

490

502

if(ret != GNUTLS_E_SUCCESS){

491

503

fprintf(stderr, "Syntax error at: %s\n", err);

499

511

do {

500

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

502

518

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

503

519

if(ret != GNUTLS_E_SUCCESS){

504

520

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

519

535

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

520

536

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

521

537

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

525

538

/* Called when a Mandos server is found */

526

539

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

527

540

AvahiIfIndex if_index,

533

546

struct sockaddr_in6 in6;

534

547

} to;

535

548

char *buffer = NULL;

536

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

537

550

size_t buffer_length = 0;

538

551

size_t buffer_capacity = 0;

539

552

size_t written;

540

int retval = 0;

553

int retval = -1;

541

554

gnutls_session_t session;

542

555

int pf; /* Protocol family */

543

556

557

errno = 0;

558

544

559

if(quit_now){

560

errno = EINTR;

545

561

return -1;

546

562

}

547

563

554

570

break;

555

571

default:

556

572

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

573

errno = EINVAL;

557

574

return -1;

558

575

}

559

576

569

586

570

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

571

588

if(tcp_sd < 0){

589

int e = errno;

572

590

perror("socket");

573

retval = -1;

591

errno = e;

574

592

goto mandos_end;

575

593

}

576

594

577

595

if(quit_now){

596

errno = EINTR;

578

597

goto mandos_end;

579

598

}

580

599

587

606

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

588

607

}

589

608

if(ret < 0 ){

609

int e = errno;

590

610

perror("inet_pton");

591

retval = -1;

611

errno = e;

592

612

goto mandos_end;

593

613

}

594

614

if(ret == 0){

615

int e = errno;

595

616

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

596

retval = -1;

617

errno = e;

597

618

goto mandos_end;

598

619

}

599

620

if(af == AF_INET6){

607

628

if(if_index == AVAHI_IF_UNSPEC){

608

629

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

609

630

" without a network interface\n");

610

retval = -1;

631

errno = EINVAL;

611

632

goto mandos_end;

612

633

}

613

634

/* Set the network interface number as scope */

620

641

}

621

642

622

643

if(quit_now){

644

errno = EINTR;

623

645

goto mandos_end;

624

646

}

625

647

656

678

}

657

679

658

680

if(quit_now){

681

errno = EINTR;

659

682

goto mandos_end;

660

683

}

661

684

665

688

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

666

689

}

667

690

if(ret < 0){

691

int e = errno;

668

692

perror("connect");

669

retval = -1;

693

errno = e;

670

694

goto mandos_end;

671

695

}

672

696

673

697

if(quit_now){

698

errno = EINTR;

674

699

goto mandos_end;

675

700

}

676

701

681

706

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

682

707

out_size - written));

683

708

if(ret == -1){

709

int e = errno;

684

710

perror("write");

685

retval = -1;

711

errno = e;

686

712

goto mandos_end;

687

713

}

688

714

written += (size_t)ret;

698

724

}

699

725

700

726

if(quit_now){

727

errno = EINTR;

701

728

goto mandos_end;

702

729

}

703

730

}

707

734

}

708

735

709

736

if(quit_now){

737

errno = EINTR;

710

738

goto mandos_end;

711

739

}

712

740

713

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

714

742

715

743

if(quit_now){

744

errno = EINTR;

716

745

goto mandos_end;

717

746

}

718

747

719

748

do {

720

749

ret = gnutls_handshake(session);

721

750

if(quit_now){

751

errno = EINTR;

722

752

goto mandos_end;

723

753

}

724

754

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

728

758

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

729

759

gnutls_perror(ret);

730

760

}

731

retval = -1;

761

errno = EPROTO;

732

762

goto mandos_end;

733

763

}

734

764

742

772

while(true){

743

773

744

774

if(quit_now){

775

errno = EINTR;

745

776

goto mandos_end;

746

777

}

747

778

748

779

buffer_capacity = incbuffer(&buffer, buffer_length,

749

780

buffer_capacity);

750

781

if(buffer_capacity == 0){

782

int e = errno;

751

783

perror("incbuffer");

752

retval = -1;

784

errno = e;

753

785

goto mandos_end;

754

786

}

755

787

756

788

if(quit_now){

789

errno = EINTR;

757

790

goto mandos_end;

758

791

}

759

792

772

805

ret = gnutls_handshake(session);

773

806

774

807

if(quit_now){

808

errno = EINTR;

775

809

goto mandos_end;

776

810

}

777

811

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

778

812

if(ret < 0){

779

813

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

780

814

gnutls_perror(ret);

781

retval = -1;

815

errno = EPROTO;

782

816

goto mandos_end;

783

817

}

784

818

break;

785

819

default:

786

820

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

787

821

" encrypted session with Mandos server\n");

788

retval = -1;

789

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

790

824

goto mandos_end;

791

825

}

792

826

} else {

799

833

}

800

834

801

835

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

810

847

811

848

if(buffer_length > 0){

812

849

ssize_t decrypted_buffer_size;

818

855

written = 0;

819

856

while(written < (size_t) decrypted_buffer_size){

820

857

if(quit_now){

858

errno = EINTR;

821

859

goto mandos_end;

822

860

}

823

861

825

863

(size_t)decrypted_buffer_size - written,

826

864

stdout);

827

865

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

866

int e = errno;

828

867

if(debug){

829

868

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

830

869

strerror(errno));

831

870

}

832

retval = -1;

833

break;

871

errno = e;

872

goto mandos_end;

834

873

}

835

874

written += (size_t)ret;

836

875

}

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

876

retval = 0;

840

877

}

841

} else {

842

retval = -1;

843

878

}

844

879

845

880

/* Shutdown procedure */

846

881

847

882

mandos_end:

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

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;

858

902

}

859

903

return retval;

860

904

}

1058

1102

.arg = "SECONDS",

1059

1103

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

1060

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 },

1061

1114

{ .name = NULL }

1062

1115

};

1063

1116

1064

1117

error_t parse_opt(int key, char *arg,

1065

1118

struct argp_state *state){

1119

errno = 0;

1066

1120

switch(key){

1067

1121

case 128: /* --debug */

1068

1122

debug = true;

1084

1138

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

1085

1139

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

1086

1140

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

1087

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

1088

exit(EXIT_FAILURE);

1141

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

1089

1142

}

1090

1143

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

1091

1144

break;

1096

1149

errno = 0;

1097

1150

delay = strtof(arg, &tmp);

1098

1151

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

1099

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

1100

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

1101

1153

}

1102

1154

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

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);

1106

1168

break;

1107

1169

default:

1108

1170

return ARGP_ERR_UNKNOWN;

1109

1171

}

1110

return 0;

1172

return errno;

1111

1173

}

1112

1174

1113

1175

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

1114

1176

.args_doc = "",

1115

1177

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

1116

1178

" passwords from a Mandos server" };

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

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;

1121

1192

goto end;

1122

1193

}

1123

1194

}

1133

1204

mc.simple_poll = avahi_simple_poll_new();

1134

1205

if(mc.simple_poll == NULL){

1135

1206

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

1136

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1137

1208

goto end;

1138

1209

}

1139

1210

1141

1212

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

1142

1213

if(ret == -1){

1143

1214

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1145

1216

goto end;

1146

1217

}

1147

1218

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

1148

1219

if(ret == -1){

1149

1220

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1151

1222

goto end;

1152

1223

}

1153

1224

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

1154

1225

if(ret == -1){

1155

1226

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1227

exitcode = EX_OSERR;

1157

1228

goto end;

1158

1229

}

1159

1230

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

1163

1234

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

1164

1235

if(ret == -1){

1165

1236

perror("sigaction");

1166

return EXIT_FAILURE;

1237

return EX_OSERR;

1167

1238

}

1168

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1240

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

1170

1241

if(ret == -1){

1171

1242

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1243

exitcode = EX_OSERR;

1173

1244

goto end;

1174

1245

}

1175

1246

}

1176

1247

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

1177

1248

if(ret == -1){

1178

1249

perror("sigaction");

1179

return EXIT_FAILURE;

1250

return EX_OSERR;

1180

1251

}

1181

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

1253

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

1183

1254

if(ret == -1){

1184

1255

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1256

exitcode = EX_OSERR;

1186

1257

goto end;

1187

1258

}

1188

1259

}

1189

1260

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

1190

1261

if(ret == -1){

1191

1262

perror("sigaction");

1192

return EXIT_FAILURE;

1263

return EX_OSERR;

1193

1264

}

1194

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

1266

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

1196

1267

if(ret == -1){

1197

1268

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1269

exitcode = EX_OSERR;

1199

1270

goto end;

1200

1271

}

1201

1272

}

1205

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

1277

if(if_index == 0){

1207

1278

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

1208

exitcode = EXIT_FAILURE;

1279

exitcode = EX_UNAVAILABLE;

1209

1280

goto end;

1210

1281

}

1211

1282

1222

1293

1223

1294

#ifdef __linux__

1224

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1225

messages to mess up the prompt */

1296

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

1226

1297

ret = klogctl(8, NULL, 5);

1227

1298

bool restore_loglevel = true;

1228

1299

if(ret == -1){

1234

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1235

1306

if(sd < 0){

1236

1307

perror("socket");

1237

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1238

1309

#ifdef __linux__

1239

1310

if(restore_loglevel){

1240

1311

ret = klogctl(7, NULL, 0);

1263

1334

}

1264

1335

}

1265

1336

#endif /* __linux__ */

1266

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1267

1338

/* Lower privileges */

1268

1339

errno = 0;

1269

1340

ret = seteuid(uid);

1279

1350

if(ret == -1){

1280

1351

take_down_interface = false;

1281

1352

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1283

1354

#ifdef __linux__

1284

1355

if(restore_loglevel){

1285

1356

ret = klogctl(7, NULL, 0);

1351

1422

ret = init_gnutls_global(pubkey, seckey);

1352

1423

if(ret == -1){

1353

1424

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

1354

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1355

1426

goto end;

1356

1427

} else {

1357

1428

gnutls_initialized = true;

1374

1445

1375

1446

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

1376

1447

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

1377

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1378

1449

goto end;

1379

1450

} else {

1380

1451

gpgme_initialized = true;

1390

1461

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

1391

1462

if(address == NULL){

1392

1463

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

1393

exitcode = EXIT_FAILURE;

1464

exitcode = EX_USAGE;

1394

1465

goto end;

1395

1466

}

1396

1467

1404

1475

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

1405

1476

or tmpmax != (uint16_t)tmpmax){

1406

1477

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

1407

exitcode = EXIT_FAILURE;

1478

exitcode = EX_USAGE;

1408

1479

goto end;

1409

1480

}

1410

1481

1429

1500

1430

1501

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

1431

1502

if(ret < 0){

1432

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

}

1433

1522

} else {

1434

1523

exitcode = EXIT_SUCCESS;

1435

1524

}

1462

1551

if(mc.server == NULL){

1463

1552

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

1464

1553

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1466

1555

goto end;

1467

1556

}

1468

1557

1477

1566

if(sb == NULL){

1478

1567

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

1479

1568

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1481

1570

goto end;

1482

1571

}

1483

1572

1532

1621

if(ret == -1){

1533

1622

perror("ioctl SIOCGIFFLAGS");

1534

1623

} else if(network.ifr_flags & IFF_UP) {

1535

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

1624

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

1536

1625

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

1537

1626

if(ret == -1){

1538

1627

perror("ioctl SIOCSIFFLAGS");

1598

1687

if(quit_now){

1599

1688

sigemptyset(&old_sigterm_action.sa_mask);

1600

1689

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1602

1693

if(ret == -1){

1603

1694

perror("sigaction");

1604

1695

}

1605

raise(signal_received);

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());

1606

1704

}

1607

1705

1608

1706

return exitcode;