/mandos/trunk : revision 24.1.138

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(), abort() */

47

srand(), strtof() */

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(), seteuid(),

75

setgid(), pause() */

74

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

75

setgid() */

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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

86

85

87

86

#ifdef __linux__

88

87

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

143

142

.dh_bits = 1024, .priority = "SECURE256"

144

143

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

145

144

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

149

145

/*

150

146

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

151

147

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

168

164

*/

169

165

static bool init_gpgme(const char *seckey,

170

166

const char *pubkey, const char *tempdir){

167

int ret;

171

168

gpgme_error_t rc;

172

169

gpgme_engine_info_t engine_info;

173

170

176

173

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

177

174

*/

178

175

bool import_key(const char *filename){

179

int ret;

180

176

int fd;

181

177

gpgme_data_t pgp_data;

182

178

253

249

return false;

254

250

}

255

251

256

return true;

252

return true;

257

253

}

258

254

259

255

/*

478

474

static int init_gnutls_session(gnutls_session_t *session){

479

475

int ret;

480

476

/* GnuTLS session creation */

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

487

478

if(ret != GNUTLS_E_SUCCESS){

488

479

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

489

480

safer_gnutls_strerror(ret));

491

482

492

483

{

493

484

const char *err;

494

do {

495

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

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

485

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

501

486

if(ret != GNUTLS_E_SUCCESS){

502

487

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

503

488

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

507

492

}

508

493

}

509

494

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

518

497

if(ret != GNUTLS_E_SUCCESS){

519

498

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

520

499

safer_gnutls_strerror(ret));

523

502

}

524

503

525

504

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

507

528

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

509

538

518

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

539

519

AvahiIfIndex if_index,

540

520

int af){

541

int ret, tcp_sd = -1;

521

int ret, tcp_sd;

542

522

ssize_t sret;

543

523

union {

544

524

struct sockaddr_in in;

545

525

struct sockaddr_in6 in6;

546

526

} to;

547

527

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

528

char *decrypted_buffer;

549

529

size_t buffer_length = 0;

550

530

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

551

532

size_t written;

552

int retval = -1;

533

int retval = 0;

553

534

gnutls_session_t session;

554

535

int pf; /* Protocol family */

555

536

556

if(quit_now){

557

return -1;

558

}

559

560

537

switch(af){

561

538

case AF_INET6:

562

539

pf = PF_INET6;

582

559

tcp_sd = socket(pf, SOCK_STREAM, 0);

583

560

if(tcp_sd < 0){

584

561

perror("socket");

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

goto mandos_end;

562

return -1;

590

563

}

591

564

592

565

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

599

572

}

600

573

if(ret < 0 ){

601

574

perror("inet_pton");

602

goto mandos_end;

575

return -1;

603

576

}

604

577

if(ret == 0){

605

578

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

606

goto mandos_end;

579

return -1;

607

580

}

608

581

if(af == AF_INET6){

609

582

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

616

589

if(if_index == AVAHI_IF_UNSPEC){

617

590

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

618

591

" without a network interface\n");

619

goto mandos_end;

592

return -1;

620

593

}

621

594

/* Set the network interface number as scope */

622

595

to.in6.sin6_scope_id = (uint32_t)if_index;

627

600

-Wunreachable-code */

628

601

}

629

602

630

if(quit_now){

631

goto mandos_end;

632

}

633

634

603

if(debug){

635

604

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

636

605

char interface[IF_NAMESIZE];

663

632

}

664

633

}

665

634

666

if(quit_now){

667

goto mandos_end;

668

}

669

670

635

if(af == AF_INET6){

671

636

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

672

637

} else {

674

639

}

675

640

if(ret < 0){

676

641

perror("connect");

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

642

return -1;

682

643

}

683

644

684

645

const char *out = mandos_protocol_version;

689

650

out_size - written));

690

651

if(ret == -1){

691

652

perror("write");

653

retval = -1;

692

654

goto mandos_end;

693

655

}

694

656

written += (size_t)ret;

702

664

break;

703

665

}

704

666

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

709

667

}

710

668

711

669

if(debug){

712

670

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

713

671

}

714

672

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

673

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

720

674

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

675

do{

726

676

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

730

677

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

731

678

732

679

if(ret != GNUTLS_E_SUCCESS){

734

681

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

735

682

gnutls_perror(ret);

736

683

}

684

retval = -1;

737

685

goto mandos_end;

738

686

}

739

687

745

693

}

746

694

747

695

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

753

696

buffer_capacity = incbuffer(&buffer, buffer_length,

754

697

buffer_capacity);

755

698

if(buffer_capacity == 0){

756

699

perror("incbuffer");

757

goto mandos_end;

758

}

759

760

if(quit_now){

700

retval = -1;

761

701

goto mandos_end;

762

702

}

763

703

772

712

case GNUTLS_E_AGAIN:

773

713

break;

774

714

case GNUTLS_E_REHANDSHAKE:

775

do {

715

do{

776

716

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

781

717

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

782

718

if(ret < 0){

783

719

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

784

720

gnutls_perror(ret);

721

retval = -1;

785

722

goto mandos_end;

786

723

}

787

724

break;

788

725

default:

789

726

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

790

727

" encrypted session with Mandos server\n");

728

retval = -1;

791

729

gnutls_bye(session, GNUTLS_SHUT_RDWR);

792

730

goto mandos_end;

793

731

}

800

738

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

801

739

}

802

740

803

if(quit_now){

804

goto mandos_end;

805

}

806

807

do {

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

809

if(quit_now){

810

goto mandos_end;

811

}

812

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

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

813

742

814

743

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

816

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

817

745

buffer_length,

818

746

&decrypted_buffer);

819

747

if(decrypted_buffer_size >= 0){

820

821

748

written = 0;

822

749

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

827

750

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

828

751

(size_t)decrypted_buffer_size - written,

829

752

stdout);

832

755

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

833

756

strerror(errno));

834

757

}

835

goto mandos_end;

758

retval = -1;

759

break;

836

760

}

837

761

written += (size_t)ret;

838

762

}

839

retval = 0;

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

840

766

}

767

} else {

768

retval = -1;

841

769

}

842

770

843

771

/* Shutdown procedure */

844

772

845

773

mandos_end:

846

free(decrypted_buffer);

847

774

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

775

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

851

776

if(ret == -1){

852

777

perror("close");

853

778

}

854

779

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

858

780

return retval;

859

781

}

860

782

877

799

/* Called whenever a service has been resolved successfully or

878

800

timed out */

879

801

880

if(quit_now){

881

return;

882

}

883

884

802

switch(event){

885

803

default:

886

804

case AVAHI_RESOLVER_FAILURE:

923

841

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

924

842

is removed from the LAN */

925

843

926

if(quit_now){

927

return;

928

}

929

930

844

switch(event){

931

845

default:

932

846

case AVAHI_BROWSER_FAILURE:

961

875

}

962

876

}

963

877

878

sig_atomic_t quit_now = 0;

879

964

880

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

965

static void handle_sigterm(int sig){

881

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

966

882

if(quit_now){

967

883

return;

968

884

}

969

885

quit_now = 1;

970

signal_received = sig;

971

886

int old_errno = errno;

972

887

if(mc.simple_poll != NULL){

973

888

avahi_simple_poll_quit(mc.simple_poll);

985

900

const char *interface = "eth0";

986

901

struct ifreq network;

987

902

int sd = -1;

988

bool take_down_interface = false;

903

bool interface_taken_up = false;

989

904

uid_t uid;

990

905

gid_t gid;

991

906

char *connect_to = NULL;

999

914

bool gpgme_initialized = false;

1000

915

float delay = 2.5f;

1001

916

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

struct sigaction old_sigterm_action;

1003

918

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1004

919

1005

uid = getuid();

1006

gid = getgid();

1007

1008

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

1009

errno = 0;

1010

ret = setgid(gid);

1011

if(ret == -1){

1012

perror("setgid");

1013

}

1014

1015

/* Lower user privileges (temporarily) */

1016

errno = 0;

1017

ret = seteuid(uid);

1018

if(ret == -1){

1019

perror("seteuid");

1020

}

1021

1022

if(quit_now){

1023

goto end;

1024

}

1025

1026

920

{

1027

921

struct argp_option options[] = {

1028

922

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

1057

951

.arg = "SECONDS",

1058

952

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

1059

953

.group = 2 },

1060

/*

1061

* These reproduce what we would get without ARGP_NO_HELP

1062

*/

1063

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

1064

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

1065

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

1066

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

1067

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

1068

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

1069

954

{ .name = NULL }

1070

955

};

1071

956

1072

957

error_t parse_opt(int key, char *arg,

1073

958

struct argp_state *state){

1074

errno = 0;

1075

959

switch(key){

1076

960

case 128: /* --debug */

1077

961

debug = true;

1093

977

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

1094

978

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

1095

979

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

1096

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

980

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

981

exit(EXIT_FAILURE);

1097

982

}

1098

983

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

1099

984

break;

1104

989

errno = 0;

1105

990

delay = strtof(arg, &tmp);

1106

991

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

1107

argp_error(state, "Bad delay");

992

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

993

exit(EXIT_FAILURE);

1108

994

}

1109

995

break;

1110

/*

1111

* These reproduce what we would get without ARGP_NO_HELP

1112

*/

1113

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

1114

argp_state_help(state, state->out_stream,

1115

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1116

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1117

case -3: /* --usage */

1118

argp_state_help(state, state->out_stream,

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1120

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

1121

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

1122

exit(argp_err_exit_status);

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1123

999

break;

1124

1000

default:

1125

1001

return ARGP_ERR_UNKNOWN;

1126

1002

}

1127

return errno;

1003

return 0;

1128

1004

}

1129

1005

1130

1006

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

1131

1007

.args_doc = "",

1132

1008

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

1133

1009

" passwords from a Mandos server" };

1134

ret = argp_parse(&argp, argc, argv,

1135

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1136

switch(ret){

1137

case 0:

1138

break;

1139

case ENOMEM:

1140

default:

1141

errno = ret;

1142

perror("argp_parse");

1143

exitcode = EX_OSERR;

1144

goto end;

1145

case EINVAL:

1146

exitcode = EX_USAGE;

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

1147

1014

goto end;

1148

1015

}

1149

1016

}

1182

1049

exitcode = EXIT_FAILURE;

1183

1050

goto end;

1184

1051

}

1185

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

1186

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

1187

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

1188

*/

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

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

1203

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1206

}

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

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

1209

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1214

}

1215

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

1216

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1219

}

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

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

1222

if(ret == -1){

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1225

goto end;

1226

}

1227

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1228

1058

1229

1059

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

1230

1060

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1249

1061

#ifdef __linux__

1250

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

1063

messages to mess up the prompt */

1252

1064

ret = klogctl(8, NULL, 5);

1253

1065

bool restore_loglevel = true;

1254

1066

if(ret == -1){

1269

1081

}

1270

1082

}

1271

1083

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

1084

goto end;

1279

1085

}

1280

1086

strcpy(network.ifr_name, interface);

1290

1096

}

1291

1097

#endif /* __linux__ */

1292

1098

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

1099

goto end;

1300

1100

}

1301

1101

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

1302

1102

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

1103

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

1305

1104

if(ret == -1){

1306

take_down_interface = false;

1307

1105

perror("ioctl SIOCSIFFLAGS");

1308

1106

exitcode = EXIT_FAILURE;

1309

1107

#ifdef __linux__

1314

1112

}

1315

1113

}

1316

1114

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1115

goto end;

1324

1116

}

1117

interface_taken_up = true;

1325

1118

}

1326

1119

/* sleep checking until interface is running */

1327

1120

for(int i=0; i < delay * 4; i++){

1337

1130

perror("nanosleep");

1338

1131

}

1339

1132

}

1340

if(not take_down_interface){

1341

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

1133

if(not interface_taken_up){

1342

1134

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

1343

1135

if(ret == -1){

1344

1136

perror("close");

1353

1145

}

1354

1146

}

1355

1147

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

1364

} else {

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

1371

}

1372

1373

if(quit_now){

1374

goto end;

1148

}

1149

1150

uid = getuid();

1151

gid = getgid();

1152

1153

errno = 0;

1154

setgid(gid);

1155

if(ret == -1){

1156

perror("setgid");

1157

}

1158

1159

ret = setuid(uid);

1160

if(ret == -1){

1161

perror("setuid");

1375

1162

}

1376

1163

1377

1164

ret = init_gnutls_global(pubkey, seckey);

1383

1170

gnutls_initialized = true;

1384

1171

}

1385

1172

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1391

1173

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

1174

perror("mkdtemp");

1394

1175

goto end;

1395

1176

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1177

tempdir_created = true;

1400

1178

1401

1179

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

1402

1180

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

1406

1184

gpgme_initialized = true;

1407

1185

}

1408

1186

1409

if(quit_now){

1410

goto end;

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

1411

1194

}

1412

1195

1413

1196

if(connect_to != NULL){

1419

1202

exitcode = EXIT_FAILURE;

1420

1203

goto end;

1421

1204

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1427

1205

uint16_t port;

1428

1206

errno = 0;

1429

1207

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

1433

1211

exitcode = EXIT_FAILURE;

1434

1212

goto end;

1435

1213

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1441

1214

port = (uint16_t)tmpmax;

1442

1215

*address = '\0';

1443

1216

address = connect_to;

1448

1221

} else {

1449

1222

af = AF_INET;

1450

1223

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1456

1224

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

1457

1225

if(ret < 0){

1458

1226

exitcode = EXIT_FAILURE;

1461

1229

}

1462

1230

goto end;

1463

1231

}

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1232

1469

1233

{

1470

1234

AvahiServerConfig config;

1471

1235

/* Do not publish any local Zeroconf records */

1492

1256

goto end;

1493

1257

}

1494

1258

1495

if(quit_now){

1496

goto end;

1497

}

1498

1499

1259

/* Create the Avahi service browser */

1500

1260

sb = avahi_s_service_browser_new(mc.server, if_index,

1501

1261

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1507

1267

goto end;

1508

1268

}

1509

1269

1510

if(quit_now){

1511

goto end;

1512

}

1513

1514

1270

/* Run the main loop */

1515

1271

1516

1272

if(debug){

1546

1302

}

1547

1303

1548

1304

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1305

if(interface_taken_up){

1306

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

1553

1307

if(ret == -1){

1554

perror("seteuid");

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1555

1315

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1577

1319

}

1578

1320

}

1579

1321

1621

1363

}

1622

1364

}

1623

1365

1624

if(quit_now){

1625

sigemptyset(&old_sigterm_action.sa_mask);

1626

old_sigterm_action.sa_handler = SIG_DFL;

1627

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1628

&old_sigterm_action,

1629

NULL));

1630

if(ret == -1){

1631

perror("sigaction");

1632

}

1633

do {

1634

ret = raise(signal_received);

1635

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

1636

if(ret != 0){

1637

perror("raise");

1638

abort();

1639

}

1640

TEMP_FAILURE_RETRY(pause());

1641

}

1642

1643

1366

return exitcode;

1644

1367

}