/mandos/release : revision 24.1.140

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() */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid(), pause() */

74

getuid(), getgid(), setuid(),

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,

479

474

static int init_gnutls_session(gnutls_session_t *session){

480

475

int ret;

481

476

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

488

478

if(ret != GNUTLS_E_SUCCESS){

489

479

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

490

480

safer_gnutls_strerror(ret));

492

482

493

483

{

494

484

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

485

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

502

486

if(ret != GNUTLS_E_SUCCESS){

503

487

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

504

488

fprintf(stderr, "GnuTLS error: %s\n",

508

492

}

509

493

}

510

494

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

519

497

if(ret != GNUTLS_E_SUCCESS){

520

498

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

521

499

safer_gnutls_strerror(ret));

524

502

}

525

503

526

504

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

528

507

529

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

509

535

514

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

536

515

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

537

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

538

520

/* Called when a Mandos server is found */

539

521

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

540

522

AvahiIfIndex if_index,

546

528

struct sockaddr_in6 in6;

547

529

} to;

548

530

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

550

532

size_t buffer_length = 0;

551

533

size_t buffer_capacity = 0;

552

534

size_t written;

553

int retval = -1;

535

int retval = 0;

554

536

gnutls_session_t session;

555

537

int pf; /* Protocol family */

556

538

557

errno = 0;

558

559

539

if(quit_now){

560

errno = EINTR;

561

540

return -1;

562

541

}

563

542

570

549

break;

571

550

default:

572

551

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

573

errno = EINVAL;

574

552

return -1;

575

553

}

576

554

586

564

587

565

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

566

if(tcp_sd < 0){

589

int e = errno;

590

567

perror("socket");

591

errno = e;

568

retval = -1;

592

569

goto mandos_end;

593

570

}

594

571

595

572

if(quit_now){

596

errno = EINTR;

597

573

goto mandos_end;

598

574

}

599

575

606

582

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

607

583

}

608

584

if(ret < 0 ){

609

int e = errno;

610

585

perror("inet_pton");

611

errno = e;

586

retval = -1;

612

587

goto mandos_end;

613

588

}

614

589

if(ret == 0){

615

int e = errno;

616

590

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

617

errno = e;

591

retval = -1;

618

592

goto mandos_end;

619

593

}

620

594

if(af == AF_INET6){

628

602

if(if_index == AVAHI_IF_UNSPEC){

629

603

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

630

604

" without a network interface\n");

631

errno = EINVAL;

605

retval = -1;

632

606

goto mandos_end;

633

607

}

634

608

/* Set the network interface number as scope */

641

615

}

642

616

643

617

if(quit_now){

644

errno = EINTR;

645

618

goto mandos_end;

646

619

}

647

620

678

651

}

679

652

680

653

if(quit_now){

681

errno = EINTR;

682

654

goto mandos_end;

683

655

}

684

656

688

660

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

689

661

}

690

662

if(ret < 0){

691

int e = errno;

692

663

perror("connect");

693

errno = e;

664

retval = -1;

694

665

goto mandos_end;

695

666

}

696

667

697

668

if(quit_now){

698

errno = EINTR;

699

669

goto mandos_end;

700

670

}

701

671

706

676

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

707

677

out_size - written));

708

678

if(ret == -1){

709

int e = errno;

710

679

perror("write");

711

errno = e;

680

retval = -1;

712

681

goto mandos_end;

713

682

}

714

683

written += (size_t)ret;

724

693

}

725

694

726

695

if(quit_now){

727

errno = EINTR;

728

696

goto mandos_end;

729

697

}

730

698

}

734

702

}

735

703

736

704

if(quit_now){

737

errno = EINTR;

738

705

goto mandos_end;

739

706

}

740

707

741

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

709

743

710

if(quit_now){

744

errno = EINTR;

745

711

goto mandos_end;

746

712

}

747

713

748

714

do {

749

715

ret = gnutls_handshake(session);

750

716

if(quit_now){

751

errno = EINTR;

752

717

goto mandos_end;

753

718

}

754

719

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

758

723

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

759

724

gnutls_perror(ret);

760

725

}

761

errno = EPROTO;

726

retval = -1;

762

727

goto mandos_end;

763

728

}

764

729

772

737

while(true){

773

738

774

739

if(quit_now){

775

errno = EINTR;

776

740

goto mandos_end;

777

741

}

778

742

779

743

buffer_capacity = incbuffer(&buffer, buffer_length,

780

744

buffer_capacity);

781

745

if(buffer_capacity == 0){

782

int e = errno;

783

746

perror("incbuffer");

784

errno = e;

747

retval = -1;

785

748

goto mandos_end;

786

749

}

787

750

788

751

if(quit_now){

789

errno = EINTR;

790

752

goto mandos_end;

791

753

}

792

754

805

767

ret = gnutls_handshake(session);

806

768

807

769

if(quit_now){

808

errno = EINTR;

809

770

goto mandos_end;

810

771

}

811

772

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

812

773

if(ret < 0){

813

774

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

814

775

gnutls_perror(ret);

815

errno = EPROTO;

776

retval = -1;

816

777

goto mandos_end;

817

778

}

818

779

break;

819

780

default:

820

781

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

821

782

" encrypted session with Mandos server\n");

783

retval = -1;

822

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

785

goto mandos_end;

825

786

}

826

787

} else {

833

794

}

834

795

835

796

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);

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

847

805

848

806

if(buffer_length > 0){

849

807

ssize_t decrypted_buffer_size;

855

813

written = 0;

856

814

while(written < (size_t) decrypted_buffer_size){

857

815

if(quit_now){

858

errno = EINTR;

859

816

goto mandos_end;

860

817

}

861

818

863

820

(size_t)decrypted_buffer_size - written,

864

821

stdout);

865

822

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

866

int e = errno;

867

823

if(debug){

868

824

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

869

825

strerror(errno));

870

826

}

871

errno = e;

872

goto mandos_end;

827

retval = -1;

828

break;

873

829

}

874

830

written += (size_t)ret;

875

831

}

876

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

877

835

}

836

} else {

837

retval = -1;

878

838

}

879

839

880

840

/* Shutdown procedure */

881

841

882

842

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;

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

902

853

}

903

854

return retval;

904

855

}

1044

995

bool gpgme_initialized = false;

1045

996

float delay = 2.5f;

1046

997

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1048

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

1000

1050

uid = getuid();

1051

gid = getgid();

1052

1053

/* Lower any group privileges we might have, just to be safe */

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

1070

1071

1001

{

1072

1002

struct argp_option options[] = {

1073

1003

{ .name = "debug", .key = 128,

1102

1032

.arg = "SECONDS",

1103

1033

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

1104

1034

.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

1035

{ .name = NULL }

1115

1036

};

1116

1037

1117

1038

error_t parse_opt(int key, char *arg,

1118

1039

struct argp_state *state){

1119

errno = 0;

1120

1040

switch(key){

1121

1041

case 128: /* --debug */

1122

1042

debug = true;

1138

1058

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

1139

1059

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

1140

1060

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

1141

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

1061

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

1062

exit(EXIT_FAILURE);

1142

1063

}

1143

1064

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

1144

1065

break;

1149

1070

errno = 0;

1150

1071

delay = strtof(arg, &tmp);

1151

1072

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

1152

argp_error(state, "Bad delay");

1073

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

1074

exit(EXIT_FAILURE);

1153

1075

}

1154

1076

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);

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1168

1080

break;

1169

1081

default:

1170

1082

return ARGP_ERR_UNKNOWN;

1171

1083

}

1172

return errno;

1084

return 0;

1173

1085

}

1174

1086

1175

1087

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

1176

1088

.args_doc = "",

1177

1089

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

1178

1090

" 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;

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1192

1095

goto end;

1193

1096

}

1194

1097

}

1204

1107

mc.simple_poll = avahi_simple_poll_new();

1205

1108

if(mc.simple_poll == NULL){

1206

1109

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

1207

exitcode = EX_UNAVAILABLE;

1110

exitcode = EXIT_FAILURE;

1208

1111

goto end;

1209

1112

}

1210

1113

1212

1115

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

1213

1116

if(ret == -1){

1214

1117

perror("sigaddset");

1215

exitcode = EX_OSERR;

1118

exitcode = EXIT_FAILURE;

1216

1119

goto end;

1217

1120

}

1218

1121

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

1219

1122

if(ret == -1){

1220

1123

perror("sigaddset");

1221

exitcode = EX_OSERR;

1124

exitcode = EXIT_FAILURE;

1222

1125

goto end;

1223

1126

}

1224

1127

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

1225

1128

if(ret == -1){

1226

1129

perror("sigaddset");

1227

exitcode = EX_OSERR;

1130

exitcode = EXIT_FAILURE;

1228

1131

goto end;

1229

1132

}

1230

1133

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

1234

1137

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

1235

1138

if(ret == -1){

1236

1139

perror("sigaction");

1237

return EX_OSERR;

1140

return EXIT_FAILURE;

1238

1141

}

1239

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

1143

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

1241

1144

if(ret == -1){

1242

1145

perror("sigaction");

1243

exitcode = EX_OSERR;

1146

exitcode = EXIT_FAILURE;

1244

1147

goto end;

1245

1148

}

1246

1149

}

1247

1150

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

1248

1151

if(ret == -1){

1249

1152

perror("sigaction");

1250

return EX_OSERR;

1153

return EXIT_FAILURE;

1251

1154

}

1252

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

1156

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

1254

1157

if(ret == -1){

1255

1158

perror("sigaction");

1256

exitcode = EX_OSERR;

1159

exitcode = EXIT_FAILURE;

1257

1160

goto end;

1258

1161

}

1259

1162

}

1260

1163

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

1261

1164

if(ret == -1){

1262

1165

perror("sigaction");

1263

return EX_OSERR;

1166

return EXIT_FAILURE;

1264

1167

}

1265

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

1169

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

1267

1170

if(ret == -1){

1268

1171

perror("sigaction");

1269

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1270

1173

goto end;

1271

1174

}

1272

1175

}

1276

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1180

if(if_index == 0){

1278

1181

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

1279

exitcode = EX_UNAVAILABLE;

1182

exitcode = EXIT_FAILURE;

1280

1183

goto end;

1281

1184

}

1282

1185

1284

1187

goto end;

1285

1188

}

1286

1189

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

1190

#ifdef __linux__

1295

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1192

messages to mess up the prompt */

1297

1193

ret = klogctl(8, NULL, 5);

1298

1194

bool restore_loglevel = true;

1299

1195

if(ret == -1){

1305

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1202

if(sd < 0){

1307

1203

perror("socket");

1308

exitcode = EX_OSERR;

1204

exitcode = EXIT_FAILURE;

1309

1205

#ifdef __linux__

1310

1206

if(restore_loglevel){

1311

1207

ret = klogctl(7, NULL, 0);

1314

1210

}

1315

1211

}

1316

1212

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1213

goto end;

1324

1214

}

1325

1215

strcpy(network.ifr_name, interface);

1334

1224

}

1335

1225

}

1336

1226

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1227

exitcode = EXIT_FAILURE;

1344

1228

goto end;

1345

1229

}

1346

1230

if((network.ifr_flags & IFF_UP) == 0){

1350

1234

if(ret == -1){

1351

1235

take_down_interface = false;

1352

1236

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1237

exitcode = EXIT_FAILURE;

1354

1238

#ifdef __linux__

1355

1239

if(restore_loglevel){

1356

1240

ret = klogctl(7, NULL, 0);

1359

1243

}

1360

1244

}

1361

1245

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1246

goto end;

1369

1247

}

1370

1248

}

1398

1276

}

1399

1277

}

1400

1278

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

1416

1297

}

1417

1298

1418

1299

if(quit_now){

1422

1303

ret = init_gnutls_global(pubkey, seckey);

1423

1304

if(ret == -1){

1424

1305

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

1425

exitcode = EX_UNAVAILABLE;

1306

exitcode = EXIT_FAILURE;

1426

1307

goto end;

1427

1308

} else {

1428

1309

gnutls_initialized = true;

1445

1326

1446

1327

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

1447

1328

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

1448

exitcode = EX_UNAVAILABLE;

1329

exitcode = EXIT_FAILURE;

1449

1330

goto end;

1450

1331

} else {

1451

1332

gpgme_initialized = true;

1461

1342

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

1462

1343

if(address == NULL){

1463

1344

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

1464

exitcode = EX_USAGE;

1345

exitcode = EXIT_FAILURE;

1465

1346

goto end;

1466

1347

}

1467

1348

1475

1356

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

1476

1357

or tmpmax != (uint16_t)tmpmax){

1477

1358

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

1478

exitcode = EX_USAGE;

1359

exitcode = EXIT_FAILURE;

1479

1360

goto end;

1480

1361

}

1481

1362

1500

1381

1501

1382

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

1502

1383

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

}

1384

exitcode = EXIT_FAILURE;

1522

1385

} else {

1523

1386

exitcode = EXIT_SUCCESS;

1524

1387

}

1551

1414

if(mc.server == NULL){

1552

1415

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

1553

1416

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1417

exitcode = EXIT_FAILURE;

1555

1418

goto end;

1556

1419

}

1557

1420

1566

1429

if(sb == NULL){

1567

1430

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

1568

1431

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1432

exitcode = EXIT_FAILURE;

1570

1433

goto end;

1571

1434

}

1572

1435

1610

1473

1611

1474

/* Take down the network interface */

1612

1475

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1476

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

1616

1477

if(ret == -1){

1617

perror("seteuid");

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1618

1485

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1640

1489

}

1641

1490

}

1642

1491

1687

1536

if(quit_now){

1688

1537

sigemptyset(&old_sigterm_action.sa_mask);

1689

1538

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1539

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

1693

1540

if(ret == -1){

1694

1541

perror("sigaction");

1695

1542

}

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());

1543

raise(signal_received);

1704

1544

}

1705

1545

1706

1546

return exitcode;