/mandos/release : revision 24.2.5

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid() */

74

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

75

setgid(), pause() */

76

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

77

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

78

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

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

87

86

88

#ifdef __linux__

87

89

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

142

144

.dh_bits = 1024, .priority = "SECURE256"

143

145

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

144

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

145

150

/*

146

151

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

147

152

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

164

169

*/

165

170

static bool init_gpgme(const char *seckey,

166

171

const char *pubkey, const char *tempdir){

167

int ret;

168

172

gpgme_error_t rc;

169

173

gpgme_engine_info_t engine_info;

170

174

173

177

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

174

178

*/

175

179

bool import_key(const char *filename){

180

int ret;

176

181

int fd;

177

182

gpgme_data_t pgp_data;

178

183

474

479

static int init_gnutls_session(gnutls_session_t *session){

475

480

int ret;

476

481

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

478

488

if(ret != GNUTLS_E_SUCCESS){

479

489

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

480

490

safer_gnutls_strerror(ret));

482

492

483

493

{

484

494

const char *err;

485

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

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

486

502

if(ret != GNUTLS_E_SUCCESS){

487

503

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

488

504

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

492

508

}

493

509

}

494

510

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

497

519

if(ret != GNUTLS_E_SUCCESS){

498

520

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

499

521

safer_gnutls_strerror(ret));

502

524

}

503

525

504

526

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

528

508

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

530

514

535

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

515

536

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

516

537

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

538

/* Called when a Mandos server is found */

521

539

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

522

540

AvahiIfIndex if_index,

528

546

struct sockaddr_in6 in6;

529

547

} to;

530

548

char *buffer = NULL;

531

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

532

550

size_t buffer_length = 0;

533

551

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

552

size_t written;

536

int retval = 0;

553

int retval = -1;

537

554

gnutls_session_t session;

538

555

int pf; /* Protocol family */

539

556

557

errno = 0;

558

540

559

if(quit_now){

560

errno = EINTR;

541

561

return -1;

542

562

}

543

563

550

570

break;

551

571

default:

552

572

fprintf(stderr, "Bad address family: %d\n", af);

573

errno = EINVAL;

553

574

return -1;

554

575

}

555

576

565

586

566

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

588

if(tcp_sd < 0){

589

int e = errno;

568

590

perror("socket");

569

retval = -1;

591

errno = e;

570

592

goto mandos_end;

571

593

}

572

594

573

595

if(quit_now){

596

errno = EINTR;

574

597

goto mandos_end;

575

598

}

576

599

583

606

ret = inet_pton(af, ip, &to.in.sin_addr);

584

607

}

585

608

if(ret < 0 ){

609

int e = errno;

586

610

perror("inet_pton");

587

retval = -1;

611

errno = e;

588

612

goto mandos_end;

589

613

}

590

614

if(ret == 0){

615

int e = errno;

591

616

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

592

retval = -1;

617

errno = e;

593

618

goto mandos_end;

594

619

}

595

620

if(af == AF_INET6){

603

628

if(if_index == AVAHI_IF_UNSPEC){

604

629

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

605

630

" without a network interface\n");

606

retval = -1;

631

errno = EINVAL;

607

632

goto mandos_end;

608

633

}

609

634

/* Set the network interface number as scope */

616

641

}

617

642

618

643

if(quit_now){

644

errno = EINTR;

619

645

goto mandos_end;

620

646

}

621

647

652

678

}

653

679

654

680

if(quit_now){

681

errno = EINTR;

655

682

goto mandos_end;

656

683

}

657

684

661

688

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

662

689

}

663

690

if(ret < 0){

691

int e = errno;

664

692

perror("connect");

665

retval = -1;

693

errno = e;

666

694

goto mandos_end;

667

695

}

668

696

669

697

if(quit_now){

698

errno = EINTR;

670

699

goto mandos_end;

671

700

}

672

701

677

706

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

678

707

out_size - written));

679

708

if(ret == -1){

709

int e = errno;

680

710

perror("write");

681

retval = -1;

711

errno = e;

682

712

goto mandos_end;

683

713

}

684

714

written += (size_t)ret;

694

724

}

695

725

696

726

if(quit_now){

727

errno = EINTR;

697

728

goto mandos_end;

698

729

}

699

730

}

703

734

}

704

735

705

736

if(quit_now){

737

errno = EINTR;

706

738

goto mandos_end;

707

739

}

708

740

709

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

742

711

743

if(quit_now){

744

errno = EINTR;

712

745

goto mandos_end;

713

746

}

714

747

715

do{

748

do {

716

749

ret = gnutls_handshake(session);

717

750

if(quit_now){

751

errno = EINTR;

718

752

goto mandos_end;

719

753

}

720

754

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

724

758

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

725

759

gnutls_perror(ret);

726

760

}

727

retval = -1;

761

errno = EPROTO;

728

762

goto mandos_end;

729

763

}

730

764

738

772

while(true){

739

773

740

774

if(quit_now){

775

errno = EINTR;

741

776

goto mandos_end;

742

777

}

743

778

744

779

buffer_capacity = incbuffer(&buffer, buffer_length,

745

780

buffer_capacity);

746

781

if(buffer_capacity == 0){

782

int e = errno;

747

783

perror("incbuffer");

748

retval = -1;

784

errno = e;

749

785

goto mandos_end;

750

786

}

751

787

752

788

if(quit_now){

789

errno = EINTR;

753

790

goto mandos_end;

754

791

}

755

792

764

801

case GNUTLS_E_AGAIN:

765

802

break;

766

803

case GNUTLS_E_REHANDSHAKE:

767

do{

804

do {

768

805

ret = gnutls_handshake(session);

769

806

770

807

if(quit_now){

808

errno = EINTR;

771

809

goto mandos_end;

772

810

}

773

811

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

774

812

if(ret < 0){

775

813

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

776

814

gnutls_perror(ret);

777

retval = -1;

815

errno = EPROTO;

778

816

goto mandos_end;

779

817

}

780

818

break;

781

819

default:

782

820

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

783

821

" encrypted session with Mandos server\n");

784

retval = -1;

785

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

786

824

goto mandos_end;

787

825

}

788

826

} else {

795

833

}

796

834

797

835

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

806

847

807

848

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

808

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

851

buffer_length,

810

852

&decrypted_buffer);

811

853

if(decrypted_buffer_size >= 0){

854

812

855

written = 0;

813

856

while(written < (size_t) decrypted_buffer_size){

814

857

if(quit_now){

858

errno = EINTR;

815

859

goto mandos_end;

816

860

}

817

861

819

863

(size_t)decrypted_buffer_size - written,

820

864

stdout);

821

865

if(ret == 0 and ferror(stdout)){

866

int e = errno;

822

867

if(debug){

823

868

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

824

869

strerror(errno));

825

870

}

826

retval = -1;

827

break;

871

errno = e;

872

goto mandos_end;

828

873

}

829

874

written += (size_t)ret;

830

875

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

876

retval = 0;

834

877

}

835

} else {

836

retval = -1;

837

878

}

838

879

839

880

/* Shutdown procedure */

840

881

841

882

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

852

902

}

853

903

return retval;

854

904

}

994

1044

bool gpgme_initialized = false;

995

1045

float delay = 2.5f;

996

1046

997

struct sigaction old_sigterm_action;

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1049

1050

uid = getuid();

1051

gid = getgid();

1052

1053

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

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

1070

1000

1071

{

1001

1072

struct argp_option options[] = {

1002

1073

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

1031

1102

.arg = "SECONDS",

1032

1103

.doc = "Maximum delay to wait for interface startup",

1033

1104

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

{ .name = "help", .key = '?',

1109

.doc = "Give this help list", .group = -1 },

1110

{ .name = "usage", .key = -3,

1111

.doc = "Give a short usage message", .group = -1 },

1112

{ .name = "version", .key = 'V',

1113

.doc = "Print program version", .group = -1 },

1034

1114

{ .name = NULL }

1035

1115

};

1036

1116

1037

1117

error_t parse_opt(int key, char *arg,

1038

1118

struct argp_state *state){

1119

errno = 0;

1039

1120

switch(key){

1040

1121

case 128: /* --debug */

1041

1122

debug = true;

1057

1138

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

1058

1139

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

1059

1140

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

1060

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

1061

exit(EXIT_FAILURE);

1141

argp_error(state, "Bad number of DH bits");

1062

1142

}

1063

1143

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1064

1144

break;

1069

1149

errno = 0;

1070

1150

delay = strtof(arg, &tmp);

1071

1151

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

1072

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

1073

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

1074

1153

}

1075

1154

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

case '?': /* --help */

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

case 'V': /* --version */

1166

fprintf(state->out_stream, "%s\n", argp_program_version);

1167

exit(argp_err_exit_status);

1079

1168

break;

1080

1169

default:

1081

1170

return ARGP_ERR_UNKNOWN;

1082

1171

}

1083

return 0;

1172

return errno;

1084

1173

}

1085

1174

1086

1175

struct argp argp = { .options = options, .parser = parse_opt,

1087

1176

.args_doc = "",

1088

1177

.doc = "Mandos client -- Get and decrypt"

1089

1178

" passwords from a Mandos server" };

1090

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

fprintf(stderr, "Unknown error while parsing arguments\n");

1093

exitcode = EXIT_FAILURE;

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

1094

1192

goto end;

1095

1193

}

1096

1194

}

1106

1204

mc.simple_poll = avahi_simple_poll_new();

1107

1205

if(mc.simple_poll == NULL){

1108

1206

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

1109

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1110

1208

goto end;

1111

1209

}

1112

1210

1114

1212

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

1115

1213

if(ret == -1){

1116

1214

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1118

1216

goto end;

1119

1217

}

1120

1218

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

1121

1219

if(ret == -1){

1122

1220

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1124

1222

goto end;

1125

1223

}

1126

1224

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

1127

1225

if(ret == -1){

1128

1226

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1227

exitcode = EX_OSERR;

1130

1228

goto end;

1131

1229

}

1132

1230

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

1136

1234

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

1137

1235

if(ret == -1){

1138

1236

perror("sigaction");

1139

return EXIT_FAILURE;

1237

return EX_OSERR;

1140

1238

}

1141

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1240

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

1143

1241

if(ret == -1){

1144

1242

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1243

exitcode = EX_OSERR;

1146

1244

goto end;

1147

1245

}

1148

1246

}

1149

1247

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

1150

1248

if(ret == -1){

1151

1249

perror("sigaction");

1152

return EXIT_FAILURE;

1250

return EX_OSERR;

1153

1251

}

1154

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1253

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

1156

1254

if(ret == -1){

1157

1255

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1256

exitcode = EX_OSERR;

1159

1257

goto end;

1160

1258

}

1161

1259

}

1162

1260

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

1163

1261

if(ret == -1){

1164

1262

perror("sigaction");

1165

return EXIT_FAILURE;

1263

return EX_OSERR;

1166

1264

}

1167

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1266

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

1169

1267

if(ret == -1){

1170

1268

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1269

exitcode = EX_OSERR;

1172

1270

goto end;

1173

1271

}

1174

1272

}

1178

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1277

if(if_index == 0){

1180

1278

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

1181

exitcode = EXIT_FAILURE;

1279

exitcode = EX_UNAVAILABLE;

1182

1280

goto end;

1183

1281

}

1184

1282

1186

1284

goto end;

1187

1285

}

1188

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1189

1294

#ifdef __linux__

1190

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1296

messages about the network interface to mess up the prompt */

1192

1297

ret = klogctl(8, NULL, 5);

1193

1298

bool restore_loglevel = true;

1194

1299

if(ret == -1){

1200

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1306

if(sd < 0){

1202

1307

perror("socket");

1203

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1204

1309

#ifdef __linux__

1205

1310

if(restore_loglevel){

1206

1311

ret = klogctl(7, NULL, 0);

1209

1314

}

1210

1315

}

1211

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1212

1323

goto end;

1213

1324

}

1214

1325

strcpy(network.ifr_name, interface);

1223

1334

}

1224

1335

}

1225

1336

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1227

1344

goto end;

1228

1345

}

1229

1346

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

1233

1350

if(ret == -1){

1234

1351

take_down_interface = false;

1235

1352

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1237

1354

#ifdef __linux__

1238

1355

if(restore_loglevel){

1239

1356

ret = klogctl(7, NULL, 0);

1242

1359

}

1243

1360

}

1244

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1245

1368

goto end;

1246

1369

}

1247

1370

}

1275

1398

}

1276

1399

}

1277

1400

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1296

1416

}

1297

1417

1298

1418

if(quit_now){

1302

1422

ret = init_gnutls_global(pubkey, seckey);

1303

1423

if(ret == -1){

1304

1424

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

1305

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1306

1426

goto end;

1307

1427

} else {

1308

1428

gnutls_initialized = true;

1325

1445

1326

1446

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

1327

1447

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

1328

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1329

1449

goto end;

1330

1450

} else {

1331

1451

gpgme_initialized = true;

1341

1461

char *address = strrchr(connect_to, ':');

1342

1462

if(address == NULL){

1343

1463

fprintf(stderr, "No colon in address\n");

1344

exitcode = EXIT_FAILURE;

1464

exitcode = EX_USAGE;

1345

1465

goto end;

1346

1466

}

1347

1467

1355

1475

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

1356

1476

or tmpmax != (uint16_t)tmpmax){

1357

1477

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

1358

exitcode = EXIT_FAILURE;

1478

exitcode = EX_USAGE;

1359

1479

goto end;

1360

1480

}

1361

1481

1380

1500

1381

1501

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

1382

1502

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1384

1522

} else {

1385

1523

exitcode = EXIT_SUCCESS;

1386

1524

}

1413

1551

if(mc.server == NULL){

1414

1552

fprintf(stderr, "Failed to create Avahi server: %s\n",

1415

1553

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1417

1555

goto end;

1418

1556

}

1419

1557

1428

1566

if(sb == NULL){

1429

1567

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

1430

1568

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1432

1570

goto end;

1433

1571

}

1434

1572

1472

1610

1473

1611

/* Take down the network interface */

1474

1612

if(take_down_interface){

1475

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

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1476

1616

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

1617

perror("seteuid");

1484

1618

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1488

1640

}

1489

1641

}

1490

1642

1535

1687

if(quit_now){

1536

1688

sigemptyset(&old_sigterm_action.sa_mask);

1537

1689

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1539

1693

if(ret == -1){

1540

1694

perror("sigaction");

1541

1695

}

1542

raise(signal_received);

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1543

1704

}

1544

1705

1545

1706

return exitcode;