/mandos/trunk : revision 309

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(), abort() */

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(),

75

setgid(), pause() */

70

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

71

setgid() */

76

72

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

77

73

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

78

74

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

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;

544

523

struct sockaddr_in6 in6;

545

524

} to;

546

525

char *buffer = NULL;

547

char *decrypted_buffer = NULL;

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

int retval = -1;

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

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

560

return -1;

589

561

}

590

562

591

563

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

592

564

if(af == AF_INET6){

593

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

594

566

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

595

567

} else { /* IPv4 */

596

568

to.in.sin_family = (sa_family_t)af;

598

570

}

599

571

if(ret < 0 ){

600

572

perror("inet_pton");

601

goto mandos_end;

573

return -1;

602

574

}

603

575

if(ret == 0){

604

576

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

605

goto mandos_end;

577

return -1;

606

578

}

607

579

if(af == AF_INET6){

608

580

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

615

587

if(if_index == AVAHI_IF_UNSPEC){

616

588

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

617

589

" without a network interface\n");

618

goto mandos_end;

590

return -1;

619

591

}

620

592

/* Set the network interface number as scope */

621

593

to.in6.sin6_scope_id = (uint32_t)if_index;

626

598

-Wunreachable-code */

627

599

}

628

600

629

if(quit_now){

630

goto mandos_end;

631

}

632

633

601

if(debug){

634

602

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

635

603

char interface[IF_NAMESIZE];

662

630

}

663

631

}

664

632

665

if(quit_now){

666

goto mandos_end;

667

}

668

669

633

if(af == AF_INET6){

670

634

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

671

635

} else {

673

637

}

674

638

if(ret < 0){

675

639

perror("connect");

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

640

return -1;

681

641

}

682

642

683

643

const char *out = mandos_protocol_version;

688

648

out_size - written));

689

649

if(ret == -1){

690

650

perror("write");

651

retval = -1;

691

652

goto mandos_end;

692

653

}

693

654

written += (size_t)ret;

701

662

break;

702

663

}

703

664

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

665

}

709

666

710

667

if(debug){

711

668

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

712

669

}

713

670

714

if(quit_now){

715

goto mandos_end;

716

}

717

718

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

672

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

673

do{

725

674

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

729

675

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

730

676

731

677

if(ret != GNUTLS_E_SUCCESS){

733

679

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

734

680

gnutls_perror(ret);

735

681

}

682

retval = -1;

736

683

goto mandos_end;

737

684

}

738

685

744

691

}

745

692

746

693

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

752

694

buffer_capacity = incbuffer(&buffer, buffer_length,

753

695

buffer_capacity);

754

696

if(buffer_capacity == 0){

755

697

perror("incbuffer");

756

goto mandos_end;

757

}

758

759

if(quit_now){

698

retval = -1;

760

699

goto mandos_end;

761

700

}

762

701

771

710

case GNUTLS_E_AGAIN:

772

711

break;

773

712

case GNUTLS_E_REHANDSHAKE:

774

do {

713

do{

775

714

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

780

715

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

781

716

if(ret < 0){

782

717

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

783

718

gnutls_perror(ret);

719

retval = -1;

784

720

goto mandos_end;

785

721

}

786

722

break;

787

723

default:

788

724

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

789

725

" encrypted session with Mandos server\n");

726

retval = -1;

790

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

791

728

goto mandos_end;

792

729

}

799

736

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

800

737

}

801

738

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);

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

812

740

813

741

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

815

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

743

buffer_length,

817

744

&decrypted_buffer);

818

745

if(decrypted_buffer_size >= 0){

819

820

746

written = 0;

821

747

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

826

748

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

827

749

(size_t)decrypted_buffer_size - written,

828

750

stdout);

831

753

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

832

754

strerror(errno));

833

755

}

834

goto mandos_end;

756

retval = -1;

757

break;

835

758

}

836

759

written += (size_t)ret;

837

760

}

838

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

839

764

}

765

} else {

766

retval = -1;

840

767

}

841

768

842

769

/* Shutdown procedure */

843

770

844

771

mandos_end:

845

free(decrypted_buffer);

846

772

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

773

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

850

774

if(ret == -1){

851

775

perror("close");

852

776

}

853

777

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

857

778

return retval;

858

779

}

859

780

876

797

/* Called whenever a service has been resolved successfully or

877

798

timed out */

878

799

879

if(quit_now){

880

return;

881

}

882

883

800

switch(event){

884

801

default:

885

802

case AVAHI_RESOLVER_FAILURE:

922

839

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

923

840

is removed from the LAN */

924

841

925

if(quit_now){

926

return;

927

}

928

929

842

switch(event){

930

843

default:

931

844

case AVAHI_BROWSER_FAILURE:

941

854

the callback function is called the Avahi server will free the

942

855

resolver for us. */

943

856

944

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

945

name, type, domain, protocol, 0,

946

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)))

947

861

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

948

862

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

949

863

break;

960

874

}

961

875

}

962

876

877

sig_atomic_t quit_now = 0;

878

963

879

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

964

static void handle_sigterm(int sig){

880

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

965

881

if(quit_now){

966

882

return;

967

883

}

968

884

quit_now = 1;

969

signal_received = sig;

970

885

int old_errno = errno;

971

886

if(mc.simple_poll != NULL){

972

887

avahi_simple_poll_quit(mc.simple_poll);

979

894

int error;

980

895

int ret;

981

896

intmax_t tmpmax;

982

char *tmp;

897

int numchars;

983

898

int exitcode = EXIT_SUCCESS;

984

899

const char *interface = "eth0";

985

900

struct ifreq network;

986

int sd = -1;

987

bool take_down_interface = false;

901

int sd;

988

902

uid_t uid;

989

903

gid_t gid;

990

904

char *connect_to = NULL;

994

908

const char *seckey = PATHDIR "/" SECKEY;

995

909

const char *pubkey = PATHDIR "/" PUBKEY;

996

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" };

997

915

bool gnutls_initialized = false;

998

916

bool gpgme_initialized = false;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

double delay = 2.5;

918

919

struct sigaction old_sigterm_action;

1002

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1003

921

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

1025

922

{

1026

923

struct argp_option options[] = {

1027

924

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

1078

975

pubkey = arg;

1079

976

break;

1080

977

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

1081

errno = 0;

1082

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

1083

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

1084

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'){

1085

981

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

1086

982

exit(EXIT_FAILURE);

1087

983

}

1091

987

mc.priority = arg;

1092

988

break;

1093

989

case 131: /* --delay */

1094

errno = 0;

1095

delay = strtof(arg, &tmp);

1096

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'){

1097

992

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

1098

993

exit(EXIT_FAILURE);

1099

994

}

1154

1049

exitcode = EXIT_FAILURE;

1155

1050

goto end;

1156

1051

}

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

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1200

1058

1201

1059

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

1202

1060

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

1221

1061

#ifdef __linux__

1222

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

1063

messages to mess up the prompt */

1241

1081

}

1242

1082

}

1243

1083

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1250

1084

goto end;

1251

1085

}

1252

1086

strcpy(network.ifr_name, interface);

1262

1096

}

1263

1097

#endif /* __linux__ */

1264

1098

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1271

1099

goto end;

1272

1100

}

1273

1101

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

1274

1102

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1276

1103

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

1277

1104

if(ret == -1){

1278

take_down_interface = false;

1279

1105

perror("ioctl SIOCSIFFLAGS");

1280

1106

exitcode = EXIT_FAILURE;

1281

1107

#ifdef __linux__

1286

1112

}

1287

1113

}

1288

1114

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1295

1115

goto end;

1296

1116

}

1297

1117

}

1309

1129

perror("nanosleep");

1310

1130

}

1311

1131

}

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

}

1132

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

1133

if(ret == -1){

1134

perror("close");

1318

1135

}

1319

1136

#ifdef __linux__

1320

1137

if(restore_loglevel){

1325

1142

}

1326

1143

}

1327

1144

#endif /* __linux__ */

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;

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");

1347

1159

}

1348

1160

1349

1161

ret = init_gnutls_global(pubkey, seckey);

1355

1167

gnutls_initialized = true;

1356

1168

}

1357

1169

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1363

1170

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

1171

perror("mkdtemp");

1366

1172

goto end;

1367

1173

}

1368

1369

if(quit_now){

1370

goto end;

1371

}

1174

tempdir_created = true;

1372

1175

1373

1176

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

1374

1177

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

1378

1181

gpgme_initialized = true;

1379

1182

}

1380

1183

1381

if(quit_now){

1382

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

}

1383

1191

}

1384

1192

1385

1193

if(connect_to != NULL){

1391

1199

exitcode = EXIT_FAILURE;

1392

1200

goto end;

1393

1201

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1399

1202

uint16_t port;

1400

errno = 0;

1401

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

1402

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

1403

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'){

1404

1206

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

1405

1207

exitcode = EXIT_FAILURE;

1406

1208

goto end;

1407

1209

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1413

1210

port = (uint16_t)tmpmax;

1414

1211

*address = '\0';

1415

1212

address = connect_to;

1420

1217

} else {

1421

1218

af = AF_INET;

1422

1219

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1428

1220

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

1429

1221

if(ret < 0){

1430

1222

exitcode = EXIT_FAILURE;

1433

1225

}

1434

1226

goto end;

1435

1227

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1228

1441

1229

{

1442

1230

AvahiServerConfig config;

1443

1231

/* Do not publish any local Zeroconf records */

1464

1252

goto end;

1465

1253

}

1466

1254

1467

if(quit_now){

1468

goto end;

1469

}

1470

1471

1255

/* Create the Avahi service browser */

1472

1256

sb = avahi_s_service_browser_new(mc.server, if_index,

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1257

AVAHI_PROTO_INET6, "_mandos._tcp",

1474

1258

NULL, 0, browse_callback, NULL);

1475

1259

if(sb == NULL){

1476

1260

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

1479

1263

goto end;

1480

1264

}

1481

1265

1482

if(quit_now){

1483

goto end;

1484

}

1485

1486

1266

/* Run the main loop */

1487

1267

1488

1268

if(debug){

1517

1297

gpgme_release(mc.ctx);

1518

1298

}

1519

1299

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

1552

1300

/* Removes the temp directory used by GPGME */

1553

1301

if(tempdir_created){

1554

1302

DIR *d;

1593

1341

}

1594

1342

}

1595

1343

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

1615

1344

return exitcode;

1616

1345

}