/mandos/release : revision 237.2.71

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() */

138

134

} mandos_context;

139

135

140

136

/* global context so signal handler can reach it*/

141

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

142

.dh_bits = 1024, .priority = "SECURE256"

143

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

144

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

137

mandos_context mc;

147

138

148

139

/*

149

140

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

167

158

*/

168

159

static bool init_gpgme(const char *seckey,

169

160

const char *pubkey, const char *tempdir){

161

int ret;

170

162

gpgme_error_t rc;

171

163

gpgme_engine_info_t engine_info;

172

164

175

167

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

176

168

*/

177

169

bool import_key(const char *filename){

178

int ret;

179

170

int fd;

180

171

gpgme_data_t pgp_data;

181

172

252

243

return false;

253

244

}

254

245

255

return true;

246

return true;

256

247

}

257

248

258

249

/*

312

303

}

313

304

gpgme_recipient_t recipient;

314

305

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;

306

if(recipient){

307

while(recipient != NULL){

308

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

309

gpgme_pubkey_algo_name(recipient->pubkey_algo));

310

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

311

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

312

recipient->status == GPG_ERR_NO_SECKEY

313

? "No" : "Yes");

314

recipient = recipient->next;

315

}

323

316

}

324

317

}

325

318

}

477

470

static int init_gnutls_session(gnutls_session_t *session){

478

471

int ret;

479

472

/* 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);

473

ret = gnutls_init(session, GNUTLS_SERVER);

486

474

if(ret != GNUTLS_E_SUCCESS){

487

475

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

488

476

safer_gnutls_strerror(ret));

490

478

491

479

{

492

480

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);

481

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

500

482

if(ret != GNUTLS_E_SUCCESS){

501

483

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

502

484

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

506

488

}

507

489

}

508

490

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);

491

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

492

mc.cred);

517

493

if(ret != GNUTLS_E_SUCCESS){

518

494

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

519

495

safer_gnutls_strerror(ret));

522

498

}

523

499

524

500

/* ignore client certificate if any. */

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

501

gnutls_certificate_server_set_request(*session,

502

GNUTLS_CERT_IGNORE);

526

503

527

504

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

528

505

537

514

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

538

515

AvahiIfIndex if_index,

539

516

int af){

540

int ret, tcp_sd = -1;

517

int ret, tcp_sd;

541

518

ssize_t sret;

542

519

union {

543

520

struct sockaddr_in in;

544

521

struct sockaddr_in6 in6;

545

522

} to;

546

523

char *buffer = NULL;

547

char *decrypted_buffer = NULL;

524

char *decrypted_buffer;

548

525

size_t buffer_length = 0;

549

526

size_t buffer_capacity = 0;

527

ssize_t decrypted_buffer_size;

550

528

size_t written;

551

int retval = -1;

529

int retval = 0;

552

530

gnutls_session_t session;

553

531

int pf; /* Protocol family */

554

532

555

if(quit_now){

556

return -1;

557

}

558

559

533

switch(af){

560

534

case AF_INET6:

561

535

pf = PF_INET6;

581

555

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

556

if(tcp_sd < 0){

583

557

perror("socket");

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

558

return -1;

589

559

}

590

560

591

561

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

592

562

if(af == AF_INET6){

593

to.in6.sin6_family = (sa_family_t)af;

563

to.in6.sin6_family = (uint16_t)af;

594

564

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

595

565

} else { /* IPv4 */

596

566

to.in.sin_family = (sa_family_t)af;

598

568

}

599

569

if(ret < 0 ){

600

570

perror("inet_pton");

601

goto mandos_end;

571

return -1;

602

572

}

603

573

if(ret == 0){

604

574

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

605

goto mandos_end;

575

return -1;

606

576

}

607

577

if(af == AF_INET6){

608

578

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

615

585

if(if_index == AVAHI_IF_UNSPEC){

616

586

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

617

587

" without a network interface\n");

618

goto mandos_end;

588

return -1;

619

589

}

620

590

/* Set the network interface number as scope */

621

591

to.in6.sin6_scope_id = (uint32_t)if_index;

626

596

-Wunreachable-code */

627

597

}

628

598

629

if(quit_now){

630

goto mandos_end;

631

}

632

633

599

if(debug){

634

600

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

635

601

char interface[IF_NAMESIZE];

662

628

}

663

629

}

664

630

665

if(quit_now){

666

goto mandos_end;

667

}

668

669

631

if(af == AF_INET6){

670

632

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

671

633

} else {

673

635

}

674

636

if(ret < 0){

675

637

perror("connect");

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

638

return -1;

681

639

}

682

640

683

641

const char *out = mandos_protocol_version;

688

646

out_size - written));

689

647

if(ret == -1){

690

648

perror("write");

649

retval = -1;

691

650

goto mandos_end;

692

651

}

693

652

written += (size_t)ret;

701

660

break;

702

661

}

703

662

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

663

}

709

664

710

665

if(debug){

711

666

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

712

667

}

713

668

714

if(quit_now){

715

goto mandos_end;

716

}

717

718

669

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

670

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

671

do{

725

672

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

729

673

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

730

674

731

675

if(ret != GNUTLS_E_SUCCESS){

733

677

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

734

678

gnutls_perror(ret);

735

679

}

680

retval = -1;

736

681

goto mandos_end;

737

682

}

738

683

744

689

}

745

690

746

691

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

752

692

buffer_capacity = incbuffer(&buffer, buffer_length,

753

693

buffer_capacity);

754

694

if(buffer_capacity == 0){

755

695

perror("incbuffer");

756

goto mandos_end;

757

}

758

759

if(quit_now){

696

retval = -1;

760

697

goto mandos_end;

761

698

}

762

699

771

708

case GNUTLS_E_AGAIN:

772

709

break;

773

710

case GNUTLS_E_REHANDSHAKE:

774

do {

711

do{

775

712

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

780

713

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

781

714

if(ret < 0){

782

715

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

783

716

gnutls_perror(ret);

717

retval = -1;

784

718

goto mandos_end;

785

719

}

786

720

break;

787

721

default:

788

722

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

789

723

" encrypted session with Mandos server\n");

724

retval = -1;

790

725

gnutls_bye(session, GNUTLS_SHUT_RDWR);

791

726

goto mandos_end;

792

727

}

799

734

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

800

735

}

801

736

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);

737

gnutls_bye(session, GNUTLS_SHUT_RDWR);

812

738

813

739

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

815

740

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

741

buffer_length,

817

742

&decrypted_buffer);

818

743

if(decrypted_buffer_size >= 0){

819

820

744

written = 0;

821

745

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

826

746

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

827

747

(size_t)decrypted_buffer_size - written,

828

748

stdout);

831

751

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

832

752

strerror(errno));

833

753

}

834

goto mandos_end;

754

retval = -1;

755

break;

835

756

}

836

757

written += (size_t)ret;

837

758

}

838

retval = 0;

759

free(decrypted_buffer);

760

} else {

761

retval = -1;

839

762

}

763

} else {

764

retval = -1;

840

765

}

841

766

842

767

/* Shutdown procedure */

843

768

844

769

mandos_end:

845

free(decrypted_buffer);

846

770

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

771

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

850

772

if(ret == -1){

851

773

perror("close");

852

774

}

853

775

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

857

776

return retval;

858

777

}

859

778

876

795

/* Called whenever a service has been resolved successfully or

877

796

timed out */

878

797

879

if(quit_now){

880

return;

881

}

882

883

798

switch(event){

884

799

default:

885

800

case AVAHI_RESOLVER_FAILURE:

922

837

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

923

838

is removed from the LAN */

924

839

925

if(quit_now){

926

return;

927

}

928

929

840

switch(event){

930

841

default:

931

842

case AVAHI_BROWSER_FAILURE:

941

852

the callback function is called the Avahi server will free the

942

853

resolver for us. */

943

854

944

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

945

name, type, domain, protocol, 0,

946

resolve_callback, NULL) == NULL)

855

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

856

protocol, name, type, domain,

857

AVAHI_PROTO_INET6, 0,

858

resolve_callback, NULL)))

947

859

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

948

860

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

949

861

break;

960

872

}

961

873

}

962

874

963

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

964

static void handle_sigterm(int sig){

875

sig_atomic_t quit_now = 0;

876

877

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

965

878

if(quit_now){

966

879

return;

967

880

}

968

881

quit_now = 1;

969

signal_received = sig;

970

882

int old_errno = errno;

971

883

if(mc.simple_poll != NULL){

972

884

avahi_simple_poll_quit(mc.simple_poll);

979

891

int error;

980

892

int ret;

981

893

intmax_t tmpmax;

982

char *tmp;

894

int numchars;

983

895

int exitcode = EXIT_SUCCESS;

984

896

const char *interface = "eth0";

985

897

struct ifreq network;

986

int sd = -1;

987

bool take_down_interface = false;

898

int sd;

988

899

uid_t uid;

989

900

gid_t gid;

990

901

char *connect_to = NULL;

994

905

const char *seckey = PATHDIR "/" SECKEY;

995

906

const char *pubkey = PATHDIR "/" PUBKEY;

996

907

908

/* Initialize Mandos context */

909

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

910

.dh_bits = 1024, .priority = "SECURE256"

911

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

997

912

bool gnutls_initialized = false;

998

913

bool gpgme_initialized = false;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

914

double delay = 2.5;

915

916

struct sigaction old_sigterm_action;

1002

917

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1003

918

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

919

{

1026

920

struct argp_option options[] = {

1027

921

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

1078

972

pubkey = arg;

1079

973

break;

1080

974

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){

975

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

976

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

977

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

1085

978

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

1086

979

exit(EXIT_FAILURE);

1087

980

}

1091

984

mc.priority = arg;

1092

985

break;

1093

986

case 131: /* --delay */

1094

errno = 0;

1095

delay = strtof(arg, &tmp);

1096

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

987

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

988

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

1097

989

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

1098

990

exit(EXIT_FAILURE);

1099

991

}

1120

1012

}

1121

1013

}

1122

1014

1123

if(not debug){

1124

avahi_set_log_function(empty_log);

1125

}

1126

1127

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1128

from the signal handler */

1129

/* Initialize the pseudo-RNG for Avahi */

1130

srand((unsigned int) time(NULL));

1131

mc.simple_poll = avahi_simple_poll_new();

1132

if(mc.simple_poll == NULL){

1133

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

1134

exitcode = EXIT_FAILURE;

1135

goto end;

1136

}

1137

1138

sigemptyset(&sigterm_action.sa_mask);

1139

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

1140

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1143

goto end;

1144

}

1145

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

1146

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1149

goto end;

1150

}

1151

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

1152

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1155

goto end;

1156

}

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

}

1200

1201

1015

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

1202

1016

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

1017

#ifdef __linux__

1222

1018

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

1019

messages to mess up the prompt */

1241

1037

}

1242

1038

}

1243

1039

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1250

1040

goto end;

1251

1041

}

1252

1042

strcpy(network.ifr_name, interface);

1262

1052

}

1263

1053

#endif /* __linux__ */

1264

1054

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1271

1055

goto end;

1272

1056

}

1273

1057

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

1274

1058

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1276

1059

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

1277

1060

if(ret == -1){

1278

take_down_interface = false;

1279

1061

perror("ioctl SIOCSIFFLAGS");

1280

1062

exitcode = EXIT_FAILURE;

1281

1063

#ifdef __linux__

1286

1068

}

1287

1069

}

1288

1070

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1295

1071

goto end;

1296

1072

}

1297

1073

}

1309

1085

perror("nanosleep");

1310

1086

}

1311

1087

}

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

}

1088

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

1089

if(ret == -1){

1090

perror("close");

1318

1091

}

1319

1092

#ifdef __linux__

1320

1093

if(restore_loglevel){

1325

1098

}

1326

1099

}

1327

1100

#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;

1101

}

1102

1103

uid = getuid();

1104

gid = getgid();

1105

1106

errno = 0;

1107

setgid(gid);

1108

if(ret == -1){

1109

perror("setgid");

1110

}

1111

1112

ret = setuid(uid);

1113

if(ret == -1){

1114

perror("setuid");

1347

1115

}

1348

1116

1349

1117

ret = init_gnutls_global(pubkey, seckey);

1355

1123

gnutls_initialized = true;

1356

1124

}

1357

1125

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1363

1126

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

1127

perror("mkdtemp");

1366

1128

goto end;

1367

1129

}

1368

1369

if(quit_now){

1370

goto end;

1371

}

1130

tempdir_created = true;

1372

1131

1373

1132

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

1374

1133

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

1378

1137

gpgme_initialized = true;

1379

1138

}

1380

1139

1381

if(quit_now){

1382

goto end;

1140

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

1141

if_index = (AvahiIfIndex) if_nametoindex(interface);

1142

if(if_index == 0){

1143

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

1144

exitcode = EXIT_FAILURE;

1145

goto end;

1146

}

1383

1147

}

1384

1148

1385

1149

if(connect_to != NULL){

1391

1155

exitcode = EXIT_FAILURE;

1392

1156

goto end;

1393

1157

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1399

1158

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){

1159

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

1160

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

1161

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

1404

1162

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

1405

1163

exitcode = EXIT_FAILURE;

1406

1164

goto end;

1407

1165

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1413

1166

port = (uint16_t)tmpmax;

1414

1167

*address = '\0';

1415

1168

address = connect_to;

1420

1173

} else {

1421

1174

af = AF_INET;

1422

1175

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1428

1176

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

1429

1177

if(ret < 0){

1430

1178

exitcode = EXIT_FAILURE;

1434

1182

goto end;

1435

1183

}

1436

1184

1437

if(quit_now){

1185

if(not debug){

1186

avahi_set_log_function(empty_log);

1187

}

1188

1189

/* Initialize the pseudo-RNG for Avahi */

1190

srand((unsigned int) time(NULL));

1191

1192

/* Allocate main Avahi loop object */

1193

mc.simple_poll = avahi_simple_poll_new();

1194

if(mc.simple_poll == NULL){

1195

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

1196

exitcode = EXIT_FAILURE;

1438

1197

goto end;

1439

1198

}

1440

1199

1464

1223

goto end;

1465

1224

}

1466

1225

1467

if(quit_now){

1468

goto end;

1469

}

1470

1471

1226

/* Create the Avahi service browser */

1472

1227

sb = avahi_s_service_browser_new(mc.server, if_index,

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1228

AVAHI_PROTO_INET6, "_mandos._tcp",

1474

1229

NULL, 0, browse_callback, NULL);

1475

1230

if(sb == NULL){

1476

1231

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

1479

1234

goto end;

1480

1235

}

1481

1236

1482

if(quit_now){

1483

goto end;

1484

}

1237

sigemptyset(&sigterm_action.sa_mask);

1238

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

1239

if(ret == -1){

1240

perror("sigaddset");

1241

exitcode = EXIT_FAILURE;

1242

goto end;

1243

}

1244

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

1245

if(ret == -1){

1246

perror("sigaddset");

1247

exitcode = EXIT_FAILURE;

1248

goto end;

1249

}

1250

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

1251

if(ret == -1){

1252

perror("sigaddset");

1253

exitcode = EXIT_FAILURE;

1254

goto end;

1255

}

1256

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

1257

if(ret == -1){

1258

perror("sigaction");

1259

exitcode = EXIT_FAILURE;

1260

goto end;

1261

}

1485

1262

1486

1263

/* Run the main loop */

1487

1264

1517

1294

gpgme_release(mc.ctx);

1518

1295

}

1519

1296

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

1297

/* Removes the temp directory used by GPGME */

1553

1298

if(tempdir_created){

1554

1299

DIR *d;

1593

1338

}

1594

1339

}

1595

1340

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

1341

return exitcode;

1616

1342

}