/mandos/release : revision 237.5.1

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() */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid() */

74

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

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,

474

479

static int init_gnutls_session(gnutls_session_t *session){

475

480

int ret;

476

481

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

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);

478

488

if(ret != GNUTLS_E_SUCCESS){

479

489

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

480

490

safer_gnutls_strerror(ret));

482

492

483

493

{

484

494

const char *err;

485

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

486

502

if(ret != GNUTLS_E_SUCCESS){

487

503

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

488

504

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

492

508

}

493

509

}

494

510

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

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);

497

519

if(ret != GNUTLS_E_SUCCESS){

498

520

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

499

521

safer_gnutls_strerror(ret));

502

524

}

503

525

504

526

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

528

508

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

530

514

535

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

515

536

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

516

537

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

538

/* Called when a Mandos server is found */

521

539

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

522

540

AvahiIfIndex if_index,

528

546

struct sockaddr_in6 in6;

529

547

} to;

530

548

char *buffer = NULL;

531

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

532

550

size_t buffer_length = 0;

533

551

size_t buffer_capacity = 0;

534

552

size_t written;

535

int retval = 0;

553

int retval = -1;

536

554

gnutls_session_t session;

537

555

int pf; /* Protocol family */

538

556

557

errno = 0;

558

539

559

if(quit_now){

560

errno = EINTR;

540

561

return -1;

541

562

}

542

563

549

570

break;

550

571

default:

551

572

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

573

errno = EINVAL;

552

574

return -1;

553

575

}

554

576

564

586

565

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

566

588

if(tcp_sd < 0){

589

int e = errno;

567

590

perror("socket");

568

retval = -1;

591

errno = e;

569

592

goto mandos_end;

570

593

}

571

594

572

595

if(quit_now){

596

errno = EINTR;

573

597

goto mandos_end;

574

598

}

575

599

582

606

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

583

607

}

584

608

if(ret < 0 ){

609

int e = errno;

585

610

perror("inet_pton");

586

retval = -1;

611

errno = e;

587

612

goto mandos_end;

588

613

}

589

614

if(ret == 0){

615

int e = errno;

590

616

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

591

retval = -1;

617

errno = e;

592

618

goto mandos_end;

593

619

}

594

620

if(af == AF_INET6){

602

628

if(if_index == AVAHI_IF_UNSPEC){

603

629

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

604

630

" without a network interface\n");

605

retval = -1;

631

errno = EINVAL;

606

632

goto mandos_end;

607

633

}

608

634

/* Set the network interface number as scope */

615

641

}

616

642

617

643

if(quit_now){

644

errno = EINTR;

618

645

goto mandos_end;

619

646

}

620

647

651

678

}

652

679

653

680

if(quit_now){

681

errno = EINTR;

654

682

goto mandos_end;

655

683

}

656

684

660

688

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

661

689

}

662

690

if(ret < 0){

691

int e = errno;

663

692

perror("connect");

664

retval = -1;

693

errno = e;

665

694

goto mandos_end;

666

695

}

667

696

668

697

if(quit_now){

698

errno = EINTR;

669

699

goto mandos_end;

670

700

}

671

701

676

706

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

677

707

out_size - written));

678

708

if(ret == -1){

709

int e = errno;

679

710

perror("write");

680

retval = -1;

711

errno = e;

681

712

goto mandos_end;

682

713

}

683

714

written += (size_t)ret;

693

724

}

694

725

695

726

if(quit_now){

727

errno = EINTR;

696

728

goto mandos_end;

697

729

}

698

730

}

702

734

}

703

735

704

736

if(quit_now){

737

errno = EINTR;

705

738

goto mandos_end;

706

739

}

707

740

708

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

709

742

710

743

if(quit_now){

744

errno = EINTR;

711

745

goto mandos_end;

712

746

}

713

747

714

748

do {

715

749

ret = gnutls_handshake(session);

716

750

if(quit_now){

751

errno = EINTR;

717

752

goto mandos_end;

718

753

}

719

754

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

723

758

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

724

759

gnutls_perror(ret);

725

760

}

726

retval = -1;

761

errno = EPROTO;

727

762

goto mandos_end;

728

763

}

729

764

737

772

while(true){

738

773

739

774

if(quit_now){

775

errno = EINTR;

740

776

goto mandos_end;

741

777

}

742

778

743

779

buffer_capacity = incbuffer(&buffer, buffer_length,

744

780

buffer_capacity);

745

781

if(buffer_capacity == 0){

782

int e = errno;

746

783

perror("incbuffer");

747

retval = -1;

784

errno = e;

748

785

goto mandos_end;

749

786

}

750

787

751

788

if(quit_now){

789

errno = EINTR;

752

790

goto mandos_end;

753

791

}

754

792

767

805

ret = gnutls_handshake(session);

768

806

769

807

if(quit_now){

808

errno = EINTR;

770

809

goto mandos_end;

771

810

}

772

811

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

773

812

if(ret < 0){

774

813

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

775

814

gnutls_perror(ret);

776

retval = -1;

815

errno = EPROTO;

777

816

goto mandos_end;

778

817

}

779

818

break;

780

819

default:

781

820

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

782

821

" encrypted session with Mandos server\n");

783

retval = -1;

784

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

785

824

goto mandos_end;

786

825

}

787

826

} else {

794

833

}

795

834

796

835

if(quit_now){

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

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);

805

847

806

848

if(buffer_length > 0){

807

849

ssize_t decrypted_buffer_size;

813

855

written = 0;

814

856

while(written < (size_t) decrypted_buffer_size){

815

857

if(quit_now){

858

errno = EINTR;

816

859

goto mandos_end;

817

860

}

818

861

820

863

(size_t)decrypted_buffer_size - written,

821

864

stdout);

822

865

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

866

int e = errno;

823

867

if(debug){

824

868

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

825

869

strerror(errno));

826

870

}

827

retval = -1;

828

break;

871

errno = e;

872

goto mandos_end;

829

873

}

830

874

written += (size_t)ret;

831

875

}

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

876

retval = 0;

835

877

}

836

} else {

837

retval = -1;

838

878

}

839

879

840

880

/* Shutdown procedure */

841

881

842

882

mandos_end:

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;

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;

853

902

}

854

903

return retval;

855

904

}

995

1044

bool gpgme_initialized = false;

996

1045

float delay = 2.5f;

997

1046

998

struct sigaction old_sigterm_action;

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

999

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1000

1049

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

1001

1071

{

1002

1072

struct argp_option options[] = {

1003

1073

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

1032

1102

.arg = "SECONDS",

1033

1103

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

1034

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 },

1035

1114

{ .name = NULL }

1036

1115

};

1037

1116

1038

1117

error_t parse_opt(int key, char *arg,

1039

1118

struct argp_state *state){

1119

errno = 0;

1040

1120

switch(key){

1041

1121

case 128: /* --debug */

1042

1122

debug = true;

1058

1138

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

1059

1139

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

1060

1140

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

1061

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

1062

exit(EXIT_FAILURE);

1141

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

1063

1142

}

1064

1143

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

1065

1144

break;

1070

1149

errno = 0;

1071

1150

delay = strtof(arg, &tmp);

1072

1151

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

1073

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

1074

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

1075

1153

}

1076

1154

break;

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

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);

1080

1168

break;

1081

1169

default:

1082

1170

return ARGP_ERR_UNKNOWN;

1083

1171

}

1084

return 0;

1172

return errno;

1085

1173

}

1086

1174

1087

1175

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

1088

1176

.args_doc = "",

1089

1177

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

1090

1178

" passwords from a Mandos server" };

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;

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;

1095

1192

goto end;

1096

1193

}

1097

1194

}

1107

1204

mc.simple_poll = avahi_simple_poll_new();

1108

1205

if(mc.simple_poll == NULL){

1109

1206

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

1110

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1111

1208

goto end;

1112

1209

}

1113

1210

1115

1212

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

1116

1213

if(ret == -1){

1117

1214

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1119

1216

goto end;

1120

1217

}

1121

1218

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

1122

1219

if(ret == -1){

1123

1220

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1125

1222

goto end;

1126

1223

}

1127

1224

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

1128

1225

if(ret == -1){

1129

1226

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

1227

exitcode = EX_OSERR;

1131

1228

goto end;

1132

1229

}

1133

1230

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

1137

1234

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

1138

1235

if(ret == -1){

1139

1236

perror("sigaction");

1140

return EXIT_FAILURE;

1237

return EX_OSERR;

1141

1238

}

1142

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1143

1240

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

1144

1241

if(ret == -1){

1145

1242

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

1243

exitcode = EX_OSERR;

1147

1244

goto end;

1148

1245

}

1149

1246

}

1150

1247

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

1151

1248

if(ret == -1){

1152

1249

perror("sigaction");

1153

return EXIT_FAILURE;

1250

return EX_OSERR;

1154

1251

}

1155

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1156

1253

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

1157

1254

if(ret == -1){

1158

1255

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

1256

exitcode = EX_OSERR;

1160

1257

goto end;

1161

1258

}

1162

1259

}

1163

1260

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

1164

1261

if(ret == -1){

1165

1262

perror("sigaction");

1166

return EXIT_FAILURE;

1263

return EX_OSERR;

1167

1264

}

1168

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1266

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

1170

1267

if(ret == -1){

1171

1268

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1269

exitcode = EX_OSERR;

1173

1270

goto end;

1174

1271

}

1175

1272

}

1179

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1180

1277

if(if_index == 0){

1181

1278

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

1182

exitcode = EXIT_FAILURE;

1279

exitcode = EX_UNAVAILABLE;

1183

1280

goto end;

1184

1281

}

1185

1282

1187

1284

goto end;

1188

1285

}

1189

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1190

1294

#ifdef __linux__

1191

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1192

messages to mess up the prompt */

1296

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

1193

1297

ret = klogctl(8, NULL, 5);

1194

1298

bool restore_loglevel = true;

1195

1299

if(ret == -1){

1201

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1202

1306

if(sd < 0){

1203

1307

perror("socket");

1204

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1205

1309

#ifdef __linux__

1206

1310

if(restore_loglevel){

1207

1311

ret = klogctl(7, NULL, 0);

1210

1314

}

1211

1315

}

1212

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1213

1323

goto end;

1214

1324

}

1215

1325

strcpy(network.ifr_name, interface);

1224

1334

}

1225

1335

}

1226

1336

#endif /* __linux__ */

1227

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1228

1344

goto end;

1229

1345

}

1230

1346

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

1234

1350

if(ret == -1){

1235

1351

take_down_interface = false;

1236

1352

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1238

1354

#ifdef __linux__

1239

1355

if(restore_loglevel){

1240

1356

ret = klogctl(7, NULL, 0);

1243

1359

}

1244

1360

}

1245

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1246

1368

goto end;

1247

1369

}

1248

1370

}

1276

1398

}

1277

1399

}

1278

1400

#endif /* __linux__ */

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");

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

}

1297

1416

}

1298

1417

1299

1418

if(quit_now){

1303

1422

ret = init_gnutls_global(pubkey, seckey);

1304

1423

if(ret == -1){

1305

1424

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

1306

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1307

1426

goto end;

1308

1427

} else {

1309

1428

gnutls_initialized = true;

1326

1445

1327

1446

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

1328

1447

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

1329

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1330

1449

goto end;

1331

1450

} else {

1332

1451

gpgme_initialized = true;

1342

1461

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

1343

1462

if(address == NULL){

1344

1463

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

1345

exitcode = EXIT_FAILURE;

1464

exitcode = EX_USAGE;

1346

1465

goto end;

1347

1466

}

1348

1467

1356

1475

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

1357

1476

or tmpmax != (uint16_t)tmpmax){

1358

1477

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

1359

exitcode = EXIT_FAILURE;

1478

exitcode = EX_USAGE;

1360

1479

goto end;

1361

1480

}

1362

1481

1381

1500

1382

1501

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

1383

1502

if(ret < 0){

1384

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

}

1385

1522

} else {

1386

1523

exitcode = EXIT_SUCCESS;

1387

1524

}

1414

1551

if(mc.server == NULL){

1415

1552

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

1416

1553

avahi_strerror(error));

1417

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1418

1555

goto end;

1419

1556

}

1420

1557

1429

1566

if(sb == NULL){

1430

1567

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

1431

1568

avahi_strerror(avahi_server_errno(mc.server)));

1432

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1433

1570

goto end;

1434

1571

}

1435

1572

1473

1610

1474

1611

/* Take down the network interface */

1475

1612

if(take_down_interface){

1476

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

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1477

1616

if(ret == -1){

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

}

1617

perror("seteuid");

1485

1618

}

1486

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

1487

if(ret == -1){

1488

perror("close");

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

}

1489

1640

}

1490

1641

}

1491

1642

1536

1687

if(quit_now){

1537

1688

sigemptyset(&old_sigterm_action.sa_mask);

1538

1689

old_sigterm_action.sa_handler = SIG_DFL;

1539

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

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1540

1693

if(ret == -1){

1541

1694

perror("sigaction");

1542

1695

}

1543

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());

1544

1704

}

1545

1705

1546

1706

return exitcode;