/mandos/release : revision 237.2.133

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() */

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

481

476

/* GnuTLS session creation */

482

477

do {

483

478

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

479

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

488

480

if(ret != GNUTLS_E_SUCCESS){

489

481

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

494

486

const char *err;

495

487

do {

496

488

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

489

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

502

490

if(ret != GNUTLS_E_SUCCESS){

503

491

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

511

499

do {

512

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

501

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

502

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

519

503

if(ret != GNUTLS_E_SUCCESS){

520

504

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

535

519

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

536

520

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

537

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

538

525

/* Called when a Mandos server is found */

539

526

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

540

527

AvahiIfIndex if_index,

546

533

struct sockaddr_in6 in6;

547

534

} to;

548

535

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

550

537

size_t buffer_length = 0;

551

538

size_t buffer_capacity = 0;

552

539

size_t written;

553

int retval = -1;

540

int retval = 0;

554

541

gnutls_session_t session;

555

542

int pf; /* Protocol family */

556

543

557

errno = 0;

558

559

544

if(quit_now){

560

errno = EINTR;

561

545

return -1;

562

546

}

563

547

570

554

break;

571

555

default:

572

556

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

573

errno = EINVAL;

574

557

return -1;

575

558

}

576

559

586

569

587

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

571

if(tcp_sd < 0){

589

int e = errno;

590

572

perror("socket");

591

errno = e;

573

retval = -1;

592

574

goto mandos_end;

593

575

}

594

576

595

577

if(quit_now){

596

errno = EINTR;

597

578

goto mandos_end;

598

579

}

599

580

606

587

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

607

588

}

608

589

if(ret < 0 ){

609

int e = errno;

610

590

perror("inet_pton");

611

errno = e;

591

retval = -1;

612

592

goto mandos_end;

613

593

}

614

594

if(ret == 0){

615

int e = errno;

616

595

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

617

errno = e;

596

retval = -1;

618

597

goto mandos_end;

619

598

}

620

599

if(af == AF_INET6){

628

607

if(if_index == AVAHI_IF_UNSPEC){

629

608

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

630

609

" without a network interface\n");

631

errno = EINVAL;

610

retval = -1;

632

611

goto mandos_end;

633

612

}

634

613

/* Set the network interface number as scope */

641

620

}

642

621

643

622

if(quit_now){

644

errno = EINTR;

645

623

goto mandos_end;

646

624

}

647

625

678

656

}

679

657

680

658

if(quit_now){

681

errno = EINTR;

682

659

goto mandos_end;

683

660

}

684

661

688

665

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

689

666

}

690

667

if(ret < 0){

691

int e = errno;

692

668

perror("connect");

693

errno = e;

669

retval = -1;

694

670

goto mandos_end;

695

671

}

696

672

697

673

if(quit_now){

698

errno = EINTR;

699

674

goto mandos_end;

700

675

}

701

676

706

681

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

707

682

out_size - written));

708

683

if(ret == -1){

709

int e = errno;

710

684

perror("write");

711

errno = e;

685

retval = -1;

712

686

goto mandos_end;

713

687

}

714

688

written += (size_t)ret;

724

698

}

725

699

726

700

if(quit_now){

727

errno = EINTR;

728

701

goto mandos_end;

729

702

}

730

703

}

734

707

}

735

708

736

709

if(quit_now){

737

errno = EINTR;

738

710

goto mandos_end;

739

711

}

740

712

741

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

714

743

715

if(quit_now){

744

errno = EINTR;

745

716

goto mandos_end;

746

717

}

747

718

748

719

do {

749

720

ret = gnutls_handshake(session);

750

721

if(quit_now){

751

errno = EINTR;

752

722

goto mandos_end;

753

723

}

754

724

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

758

728

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

759

729

gnutls_perror(ret);

760

730

}

761

errno = EPROTO;

731

retval = -1;

762

732

goto mandos_end;

763

733

}

764

734

772

742

while(true){

773

743

774

744

if(quit_now){

775

errno = EINTR;

776

745

goto mandos_end;

777

746

}

778

747

779

748

buffer_capacity = incbuffer(&buffer, buffer_length,

780

749

buffer_capacity);

781

750

if(buffer_capacity == 0){

782

int e = errno;

783

751

perror("incbuffer");

784

errno = e;

752

retval = -1;

785

753

goto mandos_end;

786

754

}

787

755

788

756

if(quit_now){

789

errno = EINTR;

790

757

goto mandos_end;

791

758

}

792

759

805

772

ret = gnutls_handshake(session);

806

773

807

774

if(quit_now){

808

errno = EINTR;

809

775

goto mandos_end;

810

776

}

811

777

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

812

778

if(ret < 0){

813

779

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

814

780

gnutls_perror(ret);

815

errno = EPROTO;

781

retval = -1;

816

782

goto mandos_end;

817

783

}

818

784

break;

819

785

default:

820

786

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

821

787

" encrypted session with Mandos server\n");

788

retval = -1;

822

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

790

goto mandos_end;

825

791

}

826

792

} else {

833

799

}

834

800

835

801

if(quit_now){

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);

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

847

810

848

811

if(buffer_length > 0){

849

812

ssize_t decrypted_buffer_size;

855

818

written = 0;

856

819

while(written < (size_t) decrypted_buffer_size){

857

820

if(quit_now){

858

errno = EINTR;

859

821

goto mandos_end;

860

822

}

861

823

863

825

(size_t)decrypted_buffer_size - written,

864

826

stdout);

865

827

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

866

int e = errno;

867

828

if(debug){

868

829

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

869

830

strerror(errno));

870

831

}

871

errno = e;

872

goto mandos_end;

832

retval = -1;

833

break;

873

834

}

874

835

written += (size_t)ret;

875

836

}

876

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

877

840

}

841

} else {

842

retval = -1;

878

843

}

879

844

880

845

/* Shutdown procedure */

881

846

882

847

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;

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;

902

858

}

903

859

return retval;

904

860

}

1102

1058

.arg = "SECONDS",

1103

1059

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

1104

1060

.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

1061

{ .name = NULL }

1115

1062

};

1116

1063

1117

1064

error_t parse_opt(int key, char *arg,

1118

1065

struct argp_state *state){

1119

errno = 0;

1120

1066

switch(key){

1121

1067

case 128: /* --debug */

1122

1068

debug = true;

1138

1084

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

1139

1085

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

1140

1086

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

1141

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

1087

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

1088

exit(EXIT_FAILURE);

1142

1089

}

1143

1090

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

1144

1091

break;

1149

1096

errno = 0;

1150

1097

delay = strtof(arg, &tmp);

1151

1098

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

1152

argp_error(state, "Bad delay");

1099

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

1100

exit(EXIT_FAILURE);

1153

1101

}

1154

1102

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);

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1168

1106

break;

1169

1107

default:

1170

1108

return ARGP_ERR_UNKNOWN;

1171

1109

}

1172

return errno;

1110

return 0;

1173

1111

}

1174

1112

1175

1113

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

1176

1114

.args_doc = "",

1177

1115

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

1178

1116

" 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;

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;

1192

1121

goto end;

1193

1122

}

1194

1123

}

1204

1133

mc.simple_poll = avahi_simple_poll_new();

1205

1134

if(mc.simple_poll == NULL){

1206

1135

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

1207

exitcode = EX_UNAVAILABLE;

1136

exitcode = EXIT_FAILURE;

1208

1137

goto end;

1209

1138

}

1210

1139

1212

1141

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

1213

1142

if(ret == -1){

1214

1143

perror("sigaddset");

1215

exitcode = EX_OSERR;

1144

exitcode = EXIT_FAILURE;

1216

1145

goto end;

1217

1146

}

1218

1147

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

1219

1148

if(ret == -1){

1220

1149

perror("sigaddset");

1221

exitcode = EX_OSERR;

1150

exitcode = EXIT_FAILURE;

1222

1151

goto end;

1223

1152

}

1224

1153

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

1225

1154

if(ret == -1){

1226

1155

perror("sigaddset");

1227

exitcode = EX_OSERR;

1156

exitcode = EXIT_FAILURE;

1228

1157

goto end;

1229

1158

}

1230

1159

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

1234

1163

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

1235

1164

if(ret == -1){

1236

1165

perror("sigaction");

1237

return EX_OSERR;

1166

return EXIT_FAILURE;

1238

1167

}

1239

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1169

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

1241

1170

if(ret == -1){

1242

1171

perror("sigaction");

1243

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1244

1173

goto end;

1245

1174

}

1246

1175

}

1247

1176

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

1248

1177

if(ret == -1){

1249

1178

perror("sigaction");

1250

return EX_OSERR;

1179

return EXIT_FAILURE;

1251

1180

}

1252

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1182

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

1254

1183

if(ret == -1){

1255

1184

perror("sigaction");

1256

exitcode = EX_OSERR;

1185

exitcode = EXIT_FAILURE;

1257

1186

goto end;

1258

1187

}

1259

1188

}

1260

1189

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

1261

1190

if(ret == -1){

1262

1191

perror("sigaction");

1263

return EX_OSERR;

1192

return EXIT_FAILURE;

1264

1193

}

1265

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1195

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

1267

1196

if(ret == -1){

1268

1197

perror("sigaction");

1269

exitcode = EX_OSERR;

1198

exitcode = EXIT_FAILURE;

1270

1199

goto end;

1271

1200

}

1272

1201

}

1276

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1206

if(if_index == 0){

1278

1207

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

1279

exitcode = EX_UNAVAILABLE;

1208

exitcode = EXIT_FAILURE;

1280

1209

goto end;

1281

1210

}

1282

1211

1293

1222

1294

1223

#ifdef __linux__

1295

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1225

messages to mess up the prompt */

1297

1226

ret = klogctl(8, NULL, 5);

1298

1227

bool restore_loglevel = true;

1299

1228

if(ret == -1){

1305

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1235

if(sd < 0){

1307

1236

perror("socket");

1308

exitcode = EX_OSERR;

1237

exitcode = EXIT_FAILURE;

1309

1238

#ifdef __linux__

1310

1239

if(restore_loglevel){

1311

1240

ret = klogctl(7, NULL, 0);

1334

1263

}

1335

1264

}

1336

1265

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1338

1267

/* Lower privileges */

1339

1268

errno = 0;

1340

1269

ret = seteuid(uid);

1350

1279

if(ret == -1){

1351

1280

take_down_interface = false;

1352

1281

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1282

exitcode = EXIT_FAILURE;

1354

1283

#ifdef __linux__

1355

1284

if(restore_loglevel){

1356

1285

ret = klogctl(7, NULL, 0);

1422

1351

ret = init_gnutls_global(pubkey, seckey);

1423

1352

if(ret == -1){

1424

1353

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

1425

exitcode = EX_UNAVAILABLE;

1354

exitcode = EXIT_FAILURE;

1426

1355

goto end;

1427

1356

} else {

1428

1357

gnutls_initialized = true;

1445

1374

1446

1375

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

1447

1376

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

1448

exitcode = EX_UNAVAILABLE;

1377

exitcode = EXIT_FAILURE;

1449

1378

goto end;

1450

1379

} else {

1451

1380

gpgme_initialized = true;

1461

1390

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

1462

1391

if(address == NULL){

1463

1392

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

1464

exitcode = EX_USAGE;

1393

exitcode = EXIT_FAILURE;

1465

1394

goto end;

1466

1395

}

1467

1396

1475

1404

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

1476

1405

or tmpmax != (uint16_t)tmpmax){

1477

1406

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

1478

exitcode = EX_USAGE;

1407

exitcode = EXIT_FAILURE;

1479

1408

goto end;

1480

1409

}

1481

1410

1500

1429

1501

1430

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

1502

1431

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

}

1432

exitcode = EXIT_FAILURE;

1522

1433

} else {

1523

1434

exitcode = EXIT_SUCCESS;

1524

1435

}

1551

1462

if(mc.server == NULL){

1552

1463

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

1553

1464

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1465

exitcode = EXIT_FAILURE;

1555

1466

goto end;

1556

1467

}

1557

1468

1566

1477

if(sb == NULL){

1567

1478

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

1568

1479

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1480

exitcode = EXIT_FAILURE;

1570

1481

goto end;

1571

1482

}

1572

1483

1621

1532

if(ret == -1){

1622

1533

perror("ioctl SIOCGIFFLAGS");

1623

1534

} else if(network.ifr_flags & IFF_UP) {

1624

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

1535

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

1625

1536

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

1626

1537

if(ret == -1){

1627

1538

perror("ioctl SIOCSIFFLAGS");

1687

1598

if(quit_now){

1688

1599

sigemptyset(&old_sigterm_action.sa_mask);

1689

1600

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1601

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

1693

1602

if(ret == -1){

1694

1603

perror("sigaction");

1695

1604

}

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());

1605

raise(signal_received);

1704

1606

}

1705

1607

1706

1608

return exitcode;