/mandos/release : revision 237.2.151

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

37

41

40

44

#include <stdint.h> /* uint16_t, uint32_t */

41

45

#include <stddef.h> /* NULL, size_t, ssize_t */

42

46

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

43

srand(), strtof() */

47

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

44

48

#include <stdbool.h> /* bool, false, true */

45

49

#include <string.h> /* memset(), strcmp(), strlen(),

46

50

strerror(), asprintf(), strcpy() */

67

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

72

*/

69

73

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

70

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

71

setgid() */

74

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

75

setgid(), pause() */

72

76

#include <arpa/inet.h> /* inet_pton(), htons */

73

77

#include <iso646.h> /* not, or, and */

74

78

#include <argp.h> /* struct argp_option, error_t, struct

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

82

#include <signal.h> /* sigemptyset(), sigaddset(),

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

81

85

82

86

#ifdef __linux__

83

87

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

138

142

.dh_bits = 1024, .priority = "SECURE256"

139

143

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

140

144

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

147

141

148

/*

142

149

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

143

150

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

160

167

*/

161

168

static bool init_gpgme(const char *seckey,

162

169

const char *pubkey, const char *tempdir){

163

int ret;

164

170

gpgme_error_t rc;

165

171

gpgme_engine_info_t engine_info;

166

172

169

175

* Helper function to insert pub and seckey to the engine keyring.

170

176

*/

171

177

bool import_key(const char *filename){

178

int ret;

172

179

int fd;

173

180

gpgme_data_t pgp_data;

174

181

245

252

return false;

246

253

}

247

254

248

return true;

255

return true;

249

256

}

250

257

251

258

/*

305

312

}

306

313

gpgme_recipient_t recipient;

307

314

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

fprintf(stderr, "Public key algorithm: %s\n",

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

313

fprintf(stderr, "Secret key available: %s\n",

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

315

while(recipient != NULL){

316

fprintf(stderr, "Public key algorithm: %s\n",

317

gpgme_pubkey_algo_name(recipient->pubkey_algo));

318

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

319

fprintf(stderr, "Secret key available: %s\n",

320

recipient->status == GPG_ERR_NO_SECKEY

321

? "No" : "Yes");

322

recipient = recipient->next;

318

323

}

319

324

}

320

325

}

472

477

static int init_gnutls_session(gnutls_session_t *session){

473

478

int ret;

474

479

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

480

do {

481

ret = gnutls_init(session, GNUTLS_SERVER);

482

if(quit_now){

483

return -1;

484

}

485

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

476

486

if(ret != GNUTLS_E_SUCCESS){

477

487

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

478

488

safer_gnutls_strerror(ret));

480

490

481

491

{

482

492

const char *err;

483

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

493

do {

494

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

495

if(quit_now){

496

gnutls_deinit(*session);

497

return -1;

498

}

499

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

484

500

if(ret != GNUTLS_E_SUCCESS){

485

501

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

486

502

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

490

506

}

491

507

}

492

508

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

509

do {

510

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

511

mc.cred);

512

if(quit_now){

513

gnutls_deinit(*session);

514

return -1;

515

}

516

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

495

517

if(ret != GNUTLS_E_SUCCESS){

496

518

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

497

519

safer_gnutls_strerror(ret));

500

522

}

501

523

502

524

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

526

506

527

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

528

516

537

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

517

538

AvahiIfIndex if_index,

518

539

int af){

519

int ret, tcp_sd;

540

int ret, tcp_sd = -1;

520

541

ssize_t sret;

521

542

union {

522

543

struct sockaddr_in in;

523

544

struct sockaddr_in6 in6;

524

545

} to;

525

546

char *buffer = NULL;

526

char *decrypted_buffer;

547

char *decrypted_buffer = NULL;

527

548

size_t buffer_length = 0;

528

549

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

550

size_t written;

531

int retval = 0;

551

int retval = -1;

532

552

gnutls_session_t session;

533

553

int pf; /* Protocol family */

534

554

555

if(quit_now){

556

return -1;

557

}

558

535

559

switch(af){

536

560

case AF_INET6:

537

561

pf = PF_INET6;

557

581

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

582

if(tcp_sd < 0){

559

583

perror("socket");

560

return -1;

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

561

589

}

562

590

563

591

memset(&to, 0, sizeof(to));

564

592

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

593

to.in6.sin6_family = (sa_family_t)af;

566

594

ret = inet_pton(af, ip, &to.in6.sin6_addr);

567

595

} else { /* IPv4 */

568

596

to.in.sin_family = (sa_family_t)af;

570

598

}

571

599

if(ret < 0 ){

572

600

perror("inet_pton");

573

return -1;

601

goto mandos_end;

574

602

}

575

603

if(ret == 0){

576

604

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

577

return -1;

605

goto mandos_end;

578

606

}

579

607

if(af == AF_INET6){

580

608

to.in6.sin6_port = htons(port); /* Spurious warnings from

587

615

if(if_index == AVAHI_IF_UNSPEC){

588

616

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

589

617

" without a network interface\n");

590

return -1;

618

goto mandos_end;

591

619

}

592

620

/* Set the network interface number as scope */

593

621

to.in6.sin6_scope_id = (uint32_t)if_index;

598

626

-Wunreachable-code */

599

627

}

600

628

629

if(quit_now){

630

goto mandos_end;

631

}

632

601

633

if(debug){

602

634

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

603

635

char interface[IF_NAMESIZE];

630

662

}

631

663

}

632

664

665

if(quit_now){

666

goto mandos_end;

667

}

668

633

669

if(af == AF_INET6){

634

670

ret = connect(tcp_sd, &to.in6, sizeof(to));

635

671

} else {

637

673

}

638

674

if(ret < 0){

639

675

perror("connect");

640

return -1;

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

641

681

}

642

682

643

683

const char *out = mandos_protocol_version;

648

688

out_size - written));

649

689

if(ret == -1){

650

690

perror("write");

651

retval = -1;

652

691

goto mandos_end;

653

692

}

654

693

written += (size_t)ret;

662

701

break;

663

702

}

664

703

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

665

708

}

666

709

667

710

if(debug){

668

711

fprintf(stderr, "Establishing TLS session with %s\n", ip);

669

712

}

670

713

714

if(quit_now){

715

goto mandos_end;

716

}

717

671

718

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

719

673

do{

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

674

725

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

675

729

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

676

730

677

731

if(ret != GNUTLS_E_SUCCESS){

679

733

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

680

734

gnutls_perror(ret);

681

735

}

682

retval = -1;

683

736

goto mandos_end;

684

737

}

685

738

691

744

}

692

745

693

746

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

694

752

buffer_capacity = incbuffer(&buffer, buffer_length,

695

753

buffer_capacity);

696

754

if(buffer_capacity == 0){

697

755

perror("incbuffer");

698

retval = -1;

756

goto mandos_end;

757

}

758

759

if(quit_now){

699

760

goto mandos_end;

700

761

}

701

762

710

771

case GNUTLS_E_AGAIN:

711

772

break;

712

773

case GNUTLS_E_REHANDSHAKE:

713

do{

774

do {

714

775

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

715

780

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

716

781

if(ret < 0){

717

782

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

718

783

gnutls_perror(ret);

719

retval = -1;

720

784

goto mandos_end;

721

785

}

722

786

break;

723

787

default:

724

788

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

725

789

" encrypted session with Mandos server\n");

726

retval = -1;

727

790

gnutls_bye(session, GNUTLS_SHUT_RDWR);

728

791

goto mandos_end;

729

792

}

736

799

fprintf(stderr, "Closing TLS session\n");

737

800

}

738

801

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

if(quit_now){

803

goto mandos_end;

804

}

805

806

do {

807

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

if(quit_now){

809

goto mandos_end;

810

}

811

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

740

812

741

813

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

742

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

816

buffer_length,

744

817

&decrypted_buffer);

745

818

if(decrypted_buffer_size >= 0){

819

746

820

written = 0;

747

821

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

748

826

ret = (int)fwrite(decrypted_buffer + written, 1,

749

827

(size_t)decrypted_buffer_size - written,

750

828

stdout);

753

831

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

754

832

strerror(errno));

755

833

}

756

retval = -1;

757

break;

834

goto mandos_end;

758

835

}

759

836

written += (size_t)ret;

760

837

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

838

retval = 0;

764

839

}

765

} else {

766

retval = -1;

767

840

}

768

841

769

842

/* Shutdown procedure */

770

843

771

844

mandos_end:

845

free(decrypted_buffer);

772

846

free(buffer);

773

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

847

if(tcp_sd >= 0){

848

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

849

}

774

850

if(ret == -1){

775

851

perror("close");

776

852

}

777

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

778

857

return retval;

779

858

}

780

859

797

876

/* Called whenever a service has been resolved successfully or

798

877

timed out */

799

878

879

if(quit_now){

880

return;

881

}

882

800

883

switch(event){

801

884

default:

802

885

case AVAHI_RESOLVER_FAILURE:

839

922

/* Called whenever a new services becomes available on the LAN or

840

923

is removed from the LAN */

841

924

925

if(quit_now){

926

return;

927

}

928

842

929

switch(event){

843

930

default:

844

931

case AVAHI_BROWSER_FAILURE:

854

941

the callback function is called the Avahi server will free the

855

942

resolver for us. */

856

943

857

if(!(avahi_s_service_resolver_new(mc.server, interface,

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

944

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

945

name, type, domain, protocol, 0,

946

resolve_callback, NULL) == NULL)

861

947

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

862

948

name, avahi_strerror(avahi_server_errno(mc.server)));

863

949

break;

874

960

}

875

961

}

876

962

877

sig_atomic_t quit_now = 0;

878

879

963

/* stop main loop after sigterm has been called */

880

static void handle_sigterm(__attribute__((unused)) int sig){

964

static void handle_sigterm(int sig){

881

965

if(quit_now){

882

966

return;

883

967

}

884

968

quit_now = 1;

969

signal_received = sig;

885

970

int old_errno = errno;

886

971

if(mc.simple_poll != NULL){

887

972

avahi_simple_poll_quit(mc.simple_poll);

898

983

int exitcode = EXIT_SUCCESS;

899

984

const char *interface = "eth0";

900

985

struct ifreq network;

901

int sd;

986

int sd = -1;

987

bool take_down_interface = false;

902

988

uid_t uid;

903

989

gid_t gid;

904

990

char *connect_to = NULL;

908

994

const char *seckey = PATHDIR "/" SECKEY;

909

995

const char *pubkey = PATHDIR "/" PUBKEY;

910

996

911

/* Initialize Mandos context */

912

mc = (mandos_context){ .simple_poll = NULL, .server = NULL,

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

915

997

bool gnutls_initialized = false;

916

998

bool gpgme_initialized = false;

917

999

float delay = 2.5f;

918

1000

919

struct sigaction old_sigterm_action;

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

920

1002

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

921

1003

1004

uid = getuid();

1005

gid = getgid();

1006

1007

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

1008

errno = 0;

1009

ret = setgid(gid);

1010

if(ret == -1){

1011

perror("setgid");

1012

}

1013

1014

/* Lower user privileges (temporarily) */

1015

errno = 0;

1016

ret = seteuid(uid);

1017

if(ret == -1){

1018

perror("seteuid");

1019

}

1020

1021

if(quit_now){

1022

goto end;

1023

}

1024

922

1025

{

923

1026

struct argp_option options[] = {

924

1027

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

1051

1154

exitcode = EXIT_FAILURE;

1052

1155

goto end;

1053

1156

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1157

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

1158

| [[info:libc:Initial Signal Actions]] |

1159

| [[info:libc:Basic Signal Handling]] |

1160

*/

1161

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

1162

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1165

}

1166

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

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

1168

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1171

goto end;

1172

}

1173

}

1174

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

1175

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1178

}

1179

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

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

1181

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1184

goto end;

1185

}

1186

}

1187

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

1188

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1191

}

1192

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

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

1194

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

1199

}

1060

1200

1061

1201

/* If the interface is down, bring it up */

1062

1202

if(interface[0] != '\0'){

1203

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

if(if_index == 0){

1205

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

1206

exitcode = EXIT_FAILURE;

1207

goto end;

1208

}

1209

1210

if(quit_now){

1211

goto end;

1212

}

1213

1214

/* Re-raise priviliges */

1215

errno = 0;

1216

ret = seteuid(0);

1217

if(ret == -1){

1218

perror("seteuid");

1219

}

1220

1063

1221

#ifdef __linux__

1064

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1065

1223

messages to mess up the prompt */

1083

1241

}

1084

1242

}

1085

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1086

1250

goto end;

1087

1251

}

1088

1252

strcpy(network.ifr_name, interface);

1098

1262

}

1099

1263

#endif /* __linux__ */

1100

1264

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1101

1271

goto end;

1102

1272

}

1103

1273

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

1104

1274

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1105

1276

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

1106

1277

if(ret == -1){

1278

take_down_interface = false;

1107

1279

perror("ioctl SIOCSIFFLAGS");

1108

1280

exitcode = EXIT_FAILURE;

1109

1281

#ifdef __linux__

1114

1286

}

1115

1287

}

1116

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1117

1295

goto end;

1118

1296

}

1119

1297

}

1131

1309

perror("nanosleep");

1132

1310

}

1133

1311

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1312

if(not take_down_interface){

1313

/* We won't need the socket anymore */

1314

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

1315

if(ret == -1){

1316

perror("close");

1317

}

1137

1318

}

1138

1319

#ifdef __linux__

1139

1320

if(restore_loglevel){

1144

1325

}

1145

1326

}

1146

1327

#endif /* __linux__ */

1147

}

1148

1149

uid = getuid();

1150

gid = getgid();

1151

1152

errno = 0;

1153

setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

ret = setuid(uid);

1159

if(ret == -1){

1160

perror("setuid");

1328

/* Lower privileges */

1329

errno = 0;

1330

if(take_down_interface){

1331

/* Lower privileges */

1332

ret = seteuid(uid);

1333

if(ret == -1){

1334

perror("seteuid");

1335

}

1336

} else {

1337

/* Lower privileges permanently */

1338

ret = setuid(uid);

1339

if(ret == -1){

1340

perror("setuid");

1341

}

1342

}

1343

}

1344

1345

if(quit_now){

1346

goto end;

1161

1347

}

1162

1348

1163

1349

ret = init_gnutls_global(pubkey, seckey);

1169

1355

gnutls_initialized = true;

1170

1356

}

1171

1357

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1172

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1173

1365

perror("mkdtemp");

1174

1366

goto end;

1175

1367

}

1176

tempdir_created = true;

1368

1369

if(quit_now){

1370

goto end;

1371

}

1177

1372

1178

1373

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

1179

1374

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

1183

1378

gpgme_initialized = true;

1184

1379

}

1185

1380

1186

if(interface[0] != '\0'){

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

1381

if(quit_now){

1382

goto end;

1193

1383

}

1194

1384

1195

1385

if(connect_to != NULL){

1201

1391

exitcode = EXIT_FAILURE;

1202

1392

goto end;

1203

1393

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1204

1399

uint16_t port;

1205

1400

errno = 0;

1206

1401

tmpmax = strtoimax(address+1, &tmp, 10);

1210

1405

exitcode = EXIT_FAILURE;

1211

1406

goto end;

1212

1407

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1213

1413

port = (uint16_t)tmpmax;

1214

1414

*address = '\0';

1215

1415

address = connect_to;

1220

1420

} else {

1221

1421

af = AF_INET;

1222

1422

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1223

1428

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

1224

1429

if(ret < 0){

1225

1430

exitcode = EXIT_FAILURE;

1228

1433

}

1229

1434

goto end;

1230

1435

}

1231

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1232

1441

{

1233

1442

AvahiServerConfig config;

1234

1443

/* Do not publish any local Zeroconf records */

1255

1464

goto end;

1256

1465

}

1257

1466

1467

if(quit_now){

1468

goto end;

1469

}

1470

1258

1471

/* Create the Avahi service browser */

1259

1472

sb = avahi_s_service_browser_new(mc.server, if_index,

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1261

1474

NULL, 0, browse_callback, NULL);

1262

1475

if(sb == NULL){

1263

1476

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

1266

1479

goto end;

1267

1480

}

1268

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1269

1486

/* Run the main loop */

1270

1487

1271

1488

if(debug){

1300

1517

gpgme_release(mc.ctx);

1301

1518

}

1302

1519

1520

/* Take down the network interface */

1521

if(take_down_interface){

1522

/* Re-raise priviliges */

1523

errno = 0;

1524

ret = seteuid(0);

1525

if(ret == -1){

1526

perror("seteuid");

1527

}

1528

if(geteuid() == 0){

1529

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

1530

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

1532

} else if(network.ifr_flags & IFF_UP) {

1533

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

1534

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

1535

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

1537

}

1538

}

1539

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

1540

if(ret == -1){

1541

perror("close");

1542

}

1543

/* Lower privileges permanently */

1544

errno = 0;

1545

ret = setuid(uid);

1546

if(ret == -1){

1547

perror("setuid");

1548

}

1549

}

1550

}

1551

1303

1552

/* Removes the temp directory used by GPGME */

1304

1553

if(tempdir_created){

1305

1554

DIR *d;

1344

1593

}

1345

1594

}

1346

1595

1596

if(quit_now){

1597

sigemptyset(&old_sigterm_action.sa_mask);

1598

old_sigterm_action.sa_handler = SIG_DFL;

1599

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1600

&old_sigterm_action,

1601

NULL));

1602

if(ret == -1){

1603

perror("sigaction");

1604

}

1605

do {

1606

ret = raise(signal_received);

1607

} while(ret != 0 and errno == EINTR);

1608

if(ret != 0){

1609

perror("raise");

1610

abort();

1611

}

1612

TEMP_FAILURE_RETRY(pause());

1613

}

1614

1347

1615

return exitcode;

1348

1616

}