/mandos/release : revision 237.2.131

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

38

42

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

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

42

45

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

43

46

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

44

srand() */

47

srand(), strtof() */

45

48

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

46

49

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

47

50

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

56

59

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

57

60

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

58

61

*/

59

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

62

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

63

strtoimax() */

60

64

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

61

65

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

62

66

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

67

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

72

*/

69

73

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

70

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

74

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

71

75

setgid() */

72

76

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

73

77

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

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 */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

80

85

81

86

#ifdef __linux__

82

87

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

83

#endif

88

#endif /* __linux__ */

84

89

85

90

/* Avahi */

86

91

/* All Avahi types, constants and functions

133

138

} mandos_context;

134

139

135

140

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

136

mandos_context mc;

141

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

142

.dh_bits = 1024, .priority = "SECURE256"

143

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

137

144

138

145

/*

139

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

140

* additional bytes. "buffer_capacity" is how much is currently

141

* allocated, "buffer_length" is how much is already used.

146

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

147

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

148

* "buffer_length" is how much is already used.

142

149

*/

143

150

size_t incbuffer(char **buffer, size_t buffer_length,

144

151

size_t buffer_capacity){

157

164

*/

158

165

static bool init_gpgme(const char *seckey,

159

166

const char *pubkey, const char *tempdir){

160

int ret;

161

167

gpgme_error_t rc;

162

168

gpgme_engine_info_t engine_info;

163

169

166

172

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

167

173

*/

168

174

bool import_key(const char *filename){

175

int ret;

169

176

int fd;

170

177

gpgme_data_t pgp_data;

171

178

242

249

return false;

243

250

}

244

251

245

return true;

252

return true;

246

253

}

247

254

248

255

/*

302

309

}

303

310

gpgme_recipient_t recipient;

304

311

recipient = result->recipients;

305

if(recipient){

306

while(recipient != NULL){

307

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

308

gpgme_pubkey_algo_name(recipient->pubkey_algo));

309

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

310

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

311

recipient->status == GPG_ERR_NO_SECKEY

312

? "No" : "Yes");

313

recipient = recipient->next;

314

}

312

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

319

recipient = recipient->next;

315

320

}

316

321

}

317

322

}

469

474

static int init_gnutls_session(gnutls_session_t *session){

470

475

int ret;

471

476

/* GnuTLS session creation */

472

ret = gnutls_init(session, GNUTLS_SERVER);

477

do {

478

ret = gnutls_init(session, GNUTLS_SERVER);

479

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

473

480

if(ret != GNUTLS_E_SUCCESS){

474

481

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

475

482

safer_gnutls_strerror(ret));

477

484

478

485

{

479

486

const char *err;

480

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

487

do {

488

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

489

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

481

490

if(ret != GNUTLS_E_SUCCESS){

482

491

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

483

492

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

487

496

}

488

497

}

489

498

490

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

491

mc.cred);

499

do {

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

mc.cred);

502

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

492

503

if(ret != GNUTLS_E_SUCCESS){

493

504

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

494

505

safer_gnutls_strerror(ret));

497

508

}

498

509

499

510

/* ignore client certificate if any. */

500

gnutls_certificate_server_set_request(*session,

501

GNUTLS_CERT_IGNORE);

511

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

502

512

503

513

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

504

514

509

519

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

510

520

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

511

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

512

525

/* Called when a Mandos server is found */

513

526

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

514

527

AvahiIfIndex if_index,

515

528

int af){

516

int ret, tcp_sd;

529

int ret, tcp_sd = -1;

517

530

ssize_t sret;

518

531

union {

519

532

struct sockaddr_in in;

523

536

char *decrypted_buffer;

524

537

size_t buffer_length = 0;

525

538

size_t buffer_capacity = 0;

526

ssize_t decrypted_buffer_size;

527

539

size_t written;

528

540

int retval = 0;

529

541

gnutls_session_t session;

530

542

int pf; /* Protocol family */

531

543

544

if(quit_now){

545

return -1;

546

}

547

532

548

switch(af){

533

549

case AF_INET6:

534

550

pf = PF_INET6;

554

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

555

571

if(tcp_sd < 0){

556

572

perror("socket");

557

return -1;

573

retval = -1;

574

goto mandos_end;

575

}

576

577

if(quit_now){

578

goto mandos_end;

558

579

}

559

580

560

581

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

561

582

if(af == AF_INET6){

562

to.in6.sin6_family = (uint16_t)af;

583

to.in6.sin6_family = (sa_family_t)af;

563

584

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

564

585

} else { /* IPv4 */

565

586

to.in.sin_family = (sa_family_t)af;

567

588

}

568

589

if(ret < 0 ){

569

590

perror("inet_pton");

570

return -1;

591

retval = -1;

592

goto mandos_end;

571

593

}

572

594

if(ret == 0){

573

595

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

574

return -1;

596

retval = -1;

597

goto mandos_end;

575

598

}

576

599

if(af == AF_INET6){

577

600

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

584

607

if(if_index == AVAHI_IF_UNSPEC){

585

608

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

586

609

" without a network interface\n");

587

return -1;

610

retval = -1;

611

goto mandos_end;

588

612

}

589

613

/* Set the network interface number as scope */

590

614

to.in6.sin6_scope_id = (uint32_t)if_index;

595

619

-Wunreachable-code */

596

620

}

597

621

622

if(quit_now){

623

goto mandos_end;

624

}

625

598

626

if(debug){

599

627

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

600

628

char interface[IF_NAMESIZE];

627

655

}

628

656

}

629

657

658

if(quit_now){

659

goto mandos_end;

660

}

661

630

662

if(af == AF_INET6){

631

663

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

632

664

} else {

634

666

}

635

667

if(ret < 0){

636

668

perror("connect");

637

return -1;

669

retval = -1;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

goto mandos_end;

638

675

}

639

676

640

677

const char *out = mandos_protocol_version;

659

696

break;

660

697

}

661

698

}

699

700

if(quit_now){

701

goto mandos_end;

702

}

662

703

}

663

704

664

705

if(debug){

665

706

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

666

707

}

667

708

709

if(quit_now){

710

goto mandos_end;

711

}

712

668

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

669

714

670

do{

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

do {

671

720

ret = gnutls_handshake(session);

721

if(quit_now){

722

goto mandos_end;

723

}

672

724

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

673

725

674

726

if(ret != GNUTLS_E_SUCCESS){

688

740

}

689

741

690

742

while(true){

743

744

if(quit_now){

745

goto mandos_end;

746

}

747

691

748

buffer_capacity = incbuffer(&buffer, buffer_length,

692

749

buffer_capacity);

693

750

if(buffer_capacity == 0){

696

753

goto mandos_end;

697

754

}

698

755

756

if(quit_now){

757

goto mandos_end;

758

}

759

699

760

sret = gnutls_record_recv(session, buffer+buffer_length,

700

761

BUFFER_SIZE);

701

762

if(sret == 0){

707

768

case GNUTLS_E_AGAIN:

708

769

break;

709

770

case GNUTLS_E_REHANDSHAKE:

710

do{

771

do {

711

772

ret = gnutls_handshake(session);

773

774

if(quit_now){

775

goto mandos_end;

776

}

712

777

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

713

778

if(ret < 0){

714

779

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

733

798

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

734

799

}

735

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

736

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

737

806

807

if(quit_now){

808

goto mandos_end;

809

}

810

738

811

if(buffer_length > 0){

812

ssize_t decrypted_buffer_size;

739

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

740

814

buffer_length,

741

815

&decrypted_buffer);

742

816

if(decrypted_buffer_size >= 0){

817

743

818

written = 0;

744

819

while(written < (size_t) decrypted_buffer_size){

820

if(quit_now){

821

goto mandos_end;

822

}

823

745

824

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

746

825

(size_t)decrypted_buffer_size - written,

747

826

stdout);

767

846

768

847

mandos_end:

769

848

free(buffer);

770

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

849

if(tcp_sd >= 0){

850

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

851

}

771

852

if(ret == -1){

772

853

perror("close");

773

854

}

774

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

775

859

return retval;

776

860

}

777

861

794

878

/* Called whenever a service has been resolved successfully or

795

879

timed out */

796

880

881

if(quit_now){

882

return;

883

}

884

797

885

switch(event){

798

886

default:

799

887

case AVAHI_RESOLVER_FAILURE:

836

924

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

837

925

is removed from the LAN */

838

926

927

if(quit_now){

928

return;

929

}

930

839

931

switch(event){

840

932

default:

841

933

case AVAHI_BROWSER_FAILURE:

851

943

the callback function is called the Avahi server will free the

852

944

resolver for us. */

853

945

854

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

855

protocol, name, type, domain,

856

AVAHI_PROTO_INET6, 0,

857

resolve_callback, NULL)))

946

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

947

name, type, domain, protocol, 0,

948

resolve_callback, NULL) == NULL)

858

949

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

859

950

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

860

951

break;

871

962

}

872

963

}

873

964

874

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

965

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

966

static void handle_sigterm(int sig){

967

if(quit_now){

968

return;

969

}

970

quit_now = 1;

971

signal_received = sig;

875

972

int old_errno = errno;

876

avahi_simple_poll_quit(mc.simple_poll);

973

if(mc.simple_poll != NULL){

974

avahi_simple_poll_quit(mc.simple_poll);

975

}

877

976

errno = old_errno;

878

977

}

879

978

882

981

int error;

883

982

int ret;

884

983

intmax_t tmpmax;

885

int numchars;

984

char *tmp;

886

985

int exitcode = EXIT_SUCCESS;

887

986

const char *interface = "eth0";

888

987

struct ifreq network;

889

int sd;

988

int sd = -1;

989

bool take_down_interface = false;

890

990

uid_t uid;

891

991

gid_t gid;

892

992

char *connect_to = NULL;

896

996

const char *seckey = PATHDIR "/" SECKEY;

897

997

const char *pubkey = PATHDIR "/" PUBKEY;

898

998

899

/* Initialize Mandos context */

900

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

901

.dh_bits = 1024, .priority = "SECURE256"

902

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

903

999

bool gnutls_initialized = false;

904

1000

bool gpgme_initialized = false;

905

double delay = 2.5;

906

1001

float delay = 2.5f;

1002

907

1003

struct sigaction old_sigterm_action;

908

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

909

1005

1006

uid = getuid();

1007

gid = getgid();

1008

1009

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

1010

errno = 0;

1011

ret = setgid(gid);

1012

if(ret == -1){

1013

perror("setgid");

1014

}

1015

1016

/* Lower user privileges (temporarily) */

1017

errno = 0;

1018

ret = seteuid(uid);

1019

if(ret == -1){

1020

perror("seteuid");

1021

}

1022

1023

if(quit_now){

1024

goto end;

1025

}

1026

910

1027

{

911

1028

struct argp_option options[] = {

912

1029

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

963

1080

pubkey = arg;

964

1081

break;

965

1082

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

966

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

967

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

968

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

1083

errno = 0;

1084

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

1085

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

1086

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

969

1087

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

970

1088

exit(EXIT_FAILURE);

971

1089

}

975

1093

mc.priority = arg;

976

1094

break;

977

1095

case 131: /* --delay */

978

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

979

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

1096

errno = 0;

1097

delay = strtof(arg, &tmp);

1098

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

980

1099

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

981

1100

exit(EXIT_FAILURE);

982

1101

}

1003

1122

}

1004

1123

}

1005

1124

1125

if(not debug){

1126

avahi_set_log_function(empty_log);

1127

}

1128

1129

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

1130

from the signal handler */

1131

/* Initialize the pseudo-RNG for Avahi */

1132

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

1133

mc.simple_poll = avahi_simple_poll_new();

1134

if(mc.simple_poll == NULL){

1135

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

1136

exitcode = EXIT_FAILURE;

1137

goto end;

1138

}

1139

1140

sigemptyset(&sigterm_action.sa_mask);

1141

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

1142

if(ret == -1){

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1145

goto end;

1146

}

1147

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

1148

if(ret == -1){

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1151

goto end;

1152

}

1153

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

1154

if(ret == -1){

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1157

goto end;

1158

}

1159

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

1160

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

1161

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

1162

*/

1163

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

1164

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1167

}

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

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

1170

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1173

goto end;

1174

}

1175

}

1176

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

1177

if(ret == -1){

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1180

}

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

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

1183

if(ret == -1){

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

1188

}

1189

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

1006

1203

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

1007

1204

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

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

if(if_index == 0){

1207

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

1208

exitcode = EXIT_FAILURE;

1209

goto end;

1210

}

1211

1212

if(quit_now){

1213

goto end;

1214

}

1215

1216

/* Re-raise priviliges */

1217

errno = 0;

1218

ret = seteuid(0);

1219

if(ret == -1){

1220

perror("seteuid");

1221

}

1222

1008

1223

#ifdef __linux__

1009

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1010

1225

messages to mess up the prompt */

1014

1229

restore_loglevel = false;

1015

1230

perror("klogctl");

1016

1231

}

1017

#endif

1232

#endif /* __linux__ */

1018

1233

1019

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1020

1235

if(sd < 0){

1027

1242

perror("klogctl");

1028

1243

}

1029

1244

}

1030

#endif

1245

#endif /* __linux__ */

1246

/* Lower privileges */

1247

errno = 0;

1248

ret = seteuid(uid);

1249

if(ret == -1){

1250

perror("seteuid");

1251

}

1031

1252

goto end;

1032

1253

}

1033

1254

strcpy(network.ifr_name, interface);

1041

1262

perror("klogctl");

1042

1263

}

1043

1264

}

1044

#endif

1265

#endif /* __linux__ */

1045

1266

exitcode = EXIT_FAILURE;

1267

/* Lower privileges */

1268

errno = 0;

1269

ret = seteuid(uid);

1270

if(ret == -1){

1271

perror("seteuid");

1272

}

1046

1273

goto end;

1047

1274

}

1048

1275

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

1049

1276

network.ifr_flags |= IFF_UP;

1277

take_down_interface = true;

1050

1278

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

1051

1279

if(ret == -1){

1280

take_down_interface = false;

1052

1281

perror("ioctl SIOCSIFFLAGS");

1053

1282

exitcode = EXIT_FAILURE;

1054

1283

#ifdef __linux__

1058

1287

perror("klogctl");

1059

1288

}

1060

1289

}

1061

#endif

1290

#endif /* __linux__ */

1291

/* Lower privileges */

1292

errno = 0;

1293

ret = seteuid(uid);

1294

if(ret == -1){

1295

perror("seteuid");

1296

}

1062

1297

goto end;

1063

1298

}

1064

1299

}

1076

1311

perror("nanosleep");

1077

1312

}

1078

1313

}

1079

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

1080

if(ret == -1){

1081

perror("close");

1314

if(not take_down_interface){

1315

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

1316

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

1317

if(ret == -1){

1318

perror("close");

1319

}

1082

1320

}

1083

1321

#ifdef __linux__

1084

1322

if(restore_loglevel){

1088

1326

perror("klogctl");

1089

1327

}

1090

1328

}

1091

#endif

1092

}

1093

1094

uid = getuid();

1095

gid = getgid();

1096

1097

errno = 0;

1098

setgid(gid);

1099

if(ret == -1){

1100

perror("setgid");

1101

}

1102

1103

ret = setuid(uid);

1104

if(ret == -1){

1105

perror("setuid");

1329

#endif /* __linux__ */

1330

/* Lower privileges */

1331

errno = 0;

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

1344

}

1345

}

1346

1347

if(quit_now){

1348

goto end;

1106

1349

}

1107

1350

1108

1351

ret = init_gnutls_global(pubkey, seckey);

1114

1357

gnutls_initialized = true;

1115

1358

}

1116

1359

1360

if(quit_now){

1361

goto end;

1362

}

1363

1364

tempdir_created = true;

1117

1365

if(mkdtemp(tempdir) == NULL){

1366

tempdir_created = false;

1118

1367

perror("mkdtemp");

1119

1368

goto end;

1120

1369

}

1121

tempdir_created = true;

1370

1371

if(quit_now){

1372

goto end;

1373

}

1122

1374

1123

1375

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

1124

1376

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

1128

1380

gpgme_initialized = true;

1129

1381

}

1130

1382

1131

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

1132

if_index = (AvahiIfIndex) if_nametoindex(interface);

1133

if(if_index == 0){

1134

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

1135

exitcode = EXIT_FAILURE;

1136

goto end;

1137

}

1383

if(quit_now){

1384

goto end;

1138

1385

}

1139

1386

1140

1387

if(connect_to != NULL){

1146

1393

exitcode = EXIT_FAILURE;

1147

1394

goto end;

1148

1395

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1400

1149

1401

uint16_t port;

1150

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

1151

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

1152

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

1402

errno = 0;

1403

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

1404

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

1405

or tmpmax != (uint16_t)tmpmax){

1153

1406

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

1154

1407

exitcode = EXIT_FAILURE;

1155

1408

goto end;

1156

1409

}

1410

1411

if(quit_now){

1412

goto end;

1413

}

1414

1157

1415

port = (uint16_t)tmpmax;

1158

1416

*address = '\0';

1159

1417

address = connect_to;

1164

1422

} else {

1165

1423

af = AF_INET;

1166

1424

}

1425

1426

if(quit_now){

1427

goto end;

1428

}

1429

1167

1430

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

1168

1431

if(ret < 0){

1169

1432

exitcode = EXIT_FAILURE;

1173

1436

goto end;

1174

1437

}

1175

1438

1176

if(not debug){

1177

avahi_set_log_function(empty_log);

1178

}

1179

1180

/* Initialize the pseudo-RNG for Avahi */

1181

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

1182

1183

/* Allocate main Avahi loop object */

1184

mc.simple_poll = avahi_simple_poll_new();

1185

if(mc.simple_poll == NULL){

1186

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

1187

exitcode = EXIT_FAILURE;

1439

if(quit_now){

1188

1440

goto end;

1189

1441

}

1190

1442

1214

1466

goto end;

1215

1467

}

1216

1468

1469

if(quit_now){

1470

goto end;

1471

}

1472

1217

1473

/* Create the Avahi service browser */

1218

1474

sb = avahi_s_service_browser_new(mc.server, if_index,

1219

AVAHI_PROTO_INET6, "_mandos._tcp",

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1220

1476

NULL, 0, browse_callback, NULL);

1221

1477

if(sb == NULL){

1222

1478

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

1225

1481

goto end;

1226

1482

}

1227

1483

1228

sigemptyset(&sigterm_action.sa_mask);

1229

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

1230

if(ret == -1){

1231

perror("sigaddset");

1232

exitcode = EXIT_FAILURE;

1484

if(quit_now){

1233

1485

goto end;

1234

1486

}

1235

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

1236

if(ret == -1){

1237

perror("sigaction");

1238

exitcode = EXIT_FAILURE;

1239

goto end;

1240

}

1241

1487

1242

1488

/* Run the main loop */

1243

1489

1273

1519

gpgme_release(mc.ctx);

1274

1520

}

1275

1521

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

1525

errno = 0;

1526

ret = seteuid(0);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

if(geteuid() == 0){

1531

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

1532

if(ret == -1){

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

1536

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

1537

if(ret == -1){

1538

perror("ioctl SIOCSIFFLAGS");

1539

}

1540

}

1541

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

1542

if(ret == -1){

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

1550

}

1551

}

1552

}

1553

1276

1554

/* Removes the temp directory used by GPGME */

1277

1555

if(tempdir_created){

1278

1556

DIR *d;

1317

1595

}

1318

1596

}

1319

1597

1598

if(quit_now){

1599

sigemptyset(&old_sigterm_action.sa_mask);

1600

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

1602

if(ret == -1){

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

1606

}

1607

1320

1608

return exitcode;

1321

1609

}