/mandos/trunk : revision 310

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

41

37

42

38

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

45

42

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

46

43

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

47

srand(), strtof() */

44

srand() */

48

45

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

49

46

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

50

47

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

59

56

#include <fcntl.h> /* open() */

60

57

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

58

*/

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

59

#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */

64

60

#include <assert.h> /* assert() */

65

61

#include <errno.h> /* perror(), errno */

66

62

#include <time.h> /* nanosleep(), time() */

71

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

68

*/

73

69

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

74

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

70

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

75

71

setgid() */

76

72

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

77

73

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

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

78

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

85

81

86

82

#ifdef __linux__

87

83

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

142

138

.dh_bits = 1024, .priority = "SECURE256"

143

139

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

144

140

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

147

148

141

/*

149

142

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

150

143

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

167

160

*/

168

161

static bool init_gpgme(const char *seckey,

169

162

const char *pubkey, const char *tempdir){

163

int ret;

170

164

gpgme_error_t rc;

171

165

gpgme_engine_info_t engine_info;

172

166

175

169

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

176

170

*/

177

171

bool import_key(const char *filename){

178

int ret;

179

172

int fd;

180

173

gpgme_data_t pgp_data;

181

174

252

245

return false;

253

246

}

254

247

255

return true;

248

return true;

256

249

}

257

250

258

251

/*

312

305

}

313

306

gpgme_recipient_t recipient;

314

307

recipient = result->recipients;

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;

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

}

323

318

}

324

319

}

325

320

}

477

472

static int init_gnutls_session(gnutls_session_t *session){

478

473

int ret;

479

474

/* GnuTLS session creation */

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);

475

ret = gnutls_init(session, GNUTLS_SERVER);

486

476

if(ret != GNUTLS_E_SUCCESS){

487

477

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

488

478

safer_gnutls_strerror(ret));

490

480

491

481

{

492

482

const char *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);

483

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

500

484

if(ret != GNUTLS_E_SUCCESS){

501

485

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

502

486

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

506

490

}

507

491

}

508

492

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);

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

517

495

if(ret != GNUTLS_E_SUCCESS){

518

496

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

519

497

safer_gnutls_strerror(ret));

522

500

}

523

501

524

502

/* ignore client certificate if any. */

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

526

505

527

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

528

507

537

516

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

538

517

AvahiIfIndex if_index,

539

518

int af){

540

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

541

520

ssize_t sret;

542

521

union {

543

522

struct sockaddr_in in;

547

526

char *decrypted_buffer;

548

527

size_t buffer_length = 0;

549

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

550

530

size_t written;

551

531

int retval = 0;

552

532

gnutls_session_t session;

553

533

int pf; /* Protocol family */

554

534

555

if(quit_now){

556

return -1;

557

}

558

559

535

switch(af){

560

536

case AF_INET6:

561

537

pf = PF_INET6;

581

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

558

if(tcp_sd < 0){

583

559

perror("socket");

584

retval = -1;

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

retval = -1;

590

goto mandos_end;

560

return -1;

591

561

}

592

562

593

563

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

594

564

if(af == AF_INET6){

595

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

596

566

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

597

567

} else { /* IPv4 */

598

568

to.in.sin_family = (sa_family_t)af;

600

570

}

601

571

if(ret < 0 ){

602

572

perror("inet_pton");

603

retval = -1;

604

goto mandos_end;

573

return -1;

605

574

}

606

575

if(ret == 0){

607

576

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

608

retval = -1;

609

goto mandos_end;

577

return -1;

610

578

}

611

579

if(af == AF_INET6){

612

580

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

619

587

if(if_index == AVAHI_IF_UNSPEC){

620

588

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

621

589

" without a network interface\n");

622

retval = -1;

623

goto mandos_end;

590

return -1;

624

591

}

625

592

/* Set the network interface number as scope */

626

593

to.in6.sin6_scope_id = (uint32_t)if_index;

631

598

-Wunreachable-code */

632

599

}

633

600

634

if(quit_now){

635

retval = -1;

636

goto mandos_end;

637

}

638

639

601

if(debug){

640

602

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

641

603

char interface[IF_NAMESIZE];

668

630

}

669

631

}

670

632

671

if(quit_now){

672

retval = -1;

673

goto mandos_end;

674

}

675

676

633

if(af == AF_INET6){

677

634

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

678

635

} else {

680

637

}

681

638

if(ret < 0){

682

639

perror("connect");

683

retval = -1;

684

goto mandos_end;

685

}

686

687

if(quit_now){

688

retval = -1;

689

goto mandos_end;

640

return -1;

690

641

}

691

642

692

643

const char *out = mandos_protocol_version;

711

662

break;

712

663

}

713

664

}

714

715

if(quit_now){

716

retval = -1;

717

goto mandos_end;

718

}

719

665

}

720

666

721

667

if(debug){

722

668

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

723

669

}

724

670

725

if(quit_now){

726

retval = -1;

727

goto mandos_end;

728

}

729

730

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

731

672

732

if(quit_now){

733

retval = -1;

734

goto mandos_end;

735

}

736

737

do {

673

do{

738

674

ret = gnutls_handshake(session);

739

if(quit_now){

740

retval = -1;

741

goto mandos_end;

742

}

743

675

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

744

676

745

677

if(ret != GNUTLS_E_SUCCESS){

759

691

}

760

692

761

693

while(true){

762

763

if(quit_now){

764

retval = -1;

765

goto mandos_end;

766

}

767

768

694

buffer_capacity = incbuffer(&buffer, buffer_length,

769

695

buffer_capacity);

770

696

if(buffer_capacity == 0){

773

699

goto mandos_end;

774

700

}

775

701

776

if(quit_now){

777

retval = -1;

778

goto mandos_end;

779

}

780

781

702

sret = gnutls_record_recv(session, buffer+buffer_length,

782

703

BUFFER_SIZE);

783

704

if(sret == 0){

789

710

case GNUTLS_E_AGAIN:

790

711

break;

791

712

case GNUTLS_E_REHANDSHAKE:

792

do {

713

do{

793

714

ret = gnutls_handshake(session);

794

795

if(quit_now){

796

retval = -1;

797

goto mandos_end;

798

}

799

715

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

800

716

if(ret < 0){

801

717

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

820

736

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

821

737

}

822

738

823

if(quit_now){

824

retval = -1;

825

goto mandos_end;

826

}

827

828

do {

829

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

830

if(quit_now){

831

retval = -1;

832

goto mandos_end;

833

}

834

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

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

835

740

836

741

if(buffer_length > 0){

837

ssize_t decrypted_buffer_size;

838

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

839

743

buffer_length,

840

744

&decrypted_buffer);

841

745

if(decrypted_buffer_size >= 0){

842

843

746

written = 0;

844

747

while(written < (size_t) decrypted_buffer_size){

845

if(quit_now){

846

retval = -1;

847

goto mandos_end;

848

}

849

850

748

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

851

749

(size_t)decrypted_buffer_size - written,

852

750

stdout);

872

770

873

771

mandos_end:

874

772

free(buffer);

875

if(tcp_sd >= 0){

876

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

877

}

773

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

878

774

if(ret == -1){

879

775

perror("close");

880

776

}

881

777

gnutls_deinit(session);

882

if(quit_now){

883

retval = -1;

884

}

885

778

return retval;

886

779

}

887

780

904

797

/* Called whenever a service has been resolved successfully or

905

798

timed out */

906

799

907

if(quit_now){

908

return;

909

}

910

911

800

switch(event){

912

801

default:

913

802

case AVAHI_RESOLVER_FAILURE:

950

839

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

951

840

is removed from the LAN */

952

841

953

if(quit_now){

954

return;

955

}

956

957

842

switch(event){

958

843

default:

959

844

case AVAHI_BROWSER_FAILURE:

969

854

the callback function is called the Avahi server will free the

970

855

resolver for us. */

971

856

972

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

973

name, type, domain, protocol, 0,

974

resolve_callback, NULL) == NULL)

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

975

861

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

976

862

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

977

863

break;

988

874

}

989

875

}

990

876

877

sig_atomic_t quit_now = 0;

878

991

879

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

992

static void handle_sigterm(int sig){

880

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

993

881

if(quit_now){

994

882

return;

995

883

}

996

884

quit_now = 1;

997

signal_received = sig;

998

885

int old_errno = errno;

999

886

if(mc.simple_poll != NULL){

1000

887

avahi_simple_poll_quit(mc.simple_poll);

1007

894

int error;

1008

895

int ret;

1009

896

intmax_t tmpmax;

1010

char *tmp;

897

int numchars;

1011

898

int exitcode = EXIT_SUCCESS;

1012

899

const char *interface = "eth0";

1013

900

struct ifreq network;

1014

int sd = -1;

1015

bool take_down_interface = false;

901

int sd;

1016

902

uid_t uid;

1017

903

gid_t gid;

1018

904

char *connect_to = NULL;

1022

908

const char *seckey = PATHDIR "/" SECKEY;

1023

909

const char *pubkey = PATHDIR "/" PUBKEY;

1024

910

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" };

1025

915

bool gnutls_initialized = false;

1026

916

bool gpgme_initialized = false;

1027

float delay = 2.5f;

1028

1029

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

double delay = 2.5;

918

919

struct sigaction old_sigterm_action;

1030

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1031

921

1032

uid = getuid();

1033

gid = getgid();

1034

1035

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

1036

errno = 0;

1037

ret = setgid(gid);

1038

if(ret == -1){

1039

perror("setgid");

1040

}

1041

1042

/* Lower user privileges (temporarily) */

1043

errno = 0;

1044

ret = seteuid(uid);

1045

if(ret == -1){

1046

perror("seteuid");

1047

}

1048

1049

if(quit_now){

1050

goto end;

1051

}

1052

1053

922

{

1054

923

struct argp_option options[] = {

1055

924

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

1106

975

pubkey = arg;

1107

976

break;

1108

977

case 129: /* --dh-bits */

1109

errno = 0;

1110

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

1111

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

1112

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

978

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

979

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

980

or arg[numchars] != '\0'){

1113

981

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

1114

982

exit(EXIT_FAILURE);

1115

983

}

1119

987

mc.priority = arg;

1120

988

break;

1121

989

case 131: /* --delay */

1122

errno = 0;

1123

delay = strtof(arg, &tmp);

1124

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

990

ret = sscanf(arg, "%lf%n", &delay, &numchars);

991

if(ret < 1 or arg[numchars] != '\0'){

1125

992

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

1126

993

exit(EXIT_FAILURE);

1127

994

}

1182

1049

exitcode = EXIT_FAILURE;

1183

1050

goto end;

1184

1051

}

1185

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

1186

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

1187

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

1188

*/

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

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

1203

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1206

}

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

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

1209

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1214

}

1215

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

1216

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1219

}

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

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

1222

if(ret == -1){

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1225

goto end;

1226

}

1227

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1228

1058

1229

1059

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

1230

1060

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1249

1061

#ifdef __linux__

1250

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

1063

messages to mess up the prompt */

1269

1081

}

1270

1082

}

1271

1083

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

1084

goto end;

1279

1085

}

1280

1086

strcpy(network.ifr_name, interface);

1290

1096

}

1291

1097

#endif /* __linux__ */

1292

1098

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

1099

goto end;

1300

1100

}

1301

1101

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

1302

1102

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

1103

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

1305

1104

if(ret == -1){

1306

take_down_interface = false;

1307

1105

perror("ioctl SIOCSIFFLAGS");

1308

1106

exitcode = EXIT_FAILURE;

1309

1107

#ifdef __linux__

1314

1112

}

1315

1113

}

1316

1114

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1115

goto end;

1324

1116

}

1325

1117

}

1337

1129

perror("nanosleep");

1338

1130

}

1339

1131

}

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1132

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

1133

if(ret == -1){

1134

perror("close");

1346

1135

}

1347

1136

#ifdef __linux__

1348

1137

if(restore_loglevel){

1353

1142

}

1354

1143

}

1355

1144

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

1364

} else {

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

1371

}

1372

1373

if(quit_now){

1374

goto end;

1145

}

1146

1147

uid = getuid();

1148

gid = getgid();

1149

1150

errno = 0;

1151

setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

ret = setuid(uid);

1157

if(ret == -1){

1158

perror("setuid");

1375

1159

}

1376

1160

1377

1161

ret = init_gnutls_global(pubkey, seckey);

1383

1167

gnutls_initialized = true;

1384

1168

}

1385

1169

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1391

1170

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

1171

perror("mkdtemp");

1394

1172

goto end;

1395

1173

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1174

tempdir_created = true;

1400

1175

1401

1176

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

1402

1177

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

1406

1181

gpgme_initialized = true;

1407

1182

}

1408

1183

1409

if(quit_now){

1410

goto end;

1184

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

1185

if_index = (AvahiIfIndex) if_nametoindex(interface);

1186

if(if_index == 0){

1187

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

1188

exitcode = EXIT_FAILURE;

1189

goto end;

1190

}

1411

1191

}

1412

1192

1413

1193

if(connect_to != NULL){

1419

1199

exitcode = EXIT_FAILURE;

1420

1200

goto end;

1421

1201

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1427

1202

uint16_t port;

1428

errno = 0;

1429

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

1430

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

1431

or tmpmax != (uint16_t)tmpmax){

1203

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1204

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1205

or address[numchars+1] != '\0'){

1432

1206

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

1433

1207

exitcode = EXIT_FAILURE;

1434

1208

goto end;

1435

1209

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1441

1210

port = (uint16_t)tmpmax;

1442

1211

*address = '\0';

1443

1212

address = connect_to;

1448

1217

} else {

1449

1218

af = AF_INET;

1450

1219

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1456

1220

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

1457

1221

if(ret < 0){

1458

1222

exitcode = EXIT_FAILURE;

1461

1225

}

1462

1226

goto end;

1463

1227

}

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1228

1469

1229

{

1470

1230

AvahiServerConfig config;

1471

1231

/* Do not publish any local Zeroconf records */

1492

1252

goto end;

1493

1253

}

1494

1254

1495

if(quit_now){

1496

goto end;

1497

}

1498

1499

1255

/* Create the Avahi service browser */

1500

1256

sb = avahi_s_service_browser_new(mc.server, if_index,

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1257

AVAHI_PROTO_INET6, "_mandos._tcp",

1502

1258

NULL, 0, browse_callback, NULL);

1503

1259

if(sb == NULL){

1504

1260

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

1507

1263

goto end;

1508

1264

}

1509

1265

1510

if(quit_now){

1511

goto end;

1512

}

1513

1514

1266

/* Run the main loop */

1515

1267

1516

1268

if(debug){

1545

1297

gpgme_release(mc.ctx);

1546

1298

}

1547

1299

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1580

1300

/* Removes the temp directory used by GPGME */

1581

1301

if(tempdir_created){

1582

1302

DIR *d;

1621

1341

}

1622

1342

}

1623

1343

1624

if(quit_now){

1625

sigemptyset(&old_sigterm_action.sa_mask);

1626

old_sigterm_action.sa_handler = SIG_DFL;

1627

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

1628

if(ret == -1){

1629

perror("sigaction");

1630

}

1631

raise(signal_received);

1632

}

1633

1634

1344

return exitcode;

1635

1345

}