/mandos/trunk : revision 356

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, srand(),

47

strtof(), abort() */

46

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

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

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 */

87

85

88

86

#ifdef __linux__

89

87

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

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

169

164

*/

170

165

static bool init_gpgme(const char *seckey,

171

166

const char *pubkey, const char *tempdir){

167

int ret;

172

168

gpgme_error_t rc;

173

169

gpgme_engine_info_t engine_info;

174

170

177

173

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

178

174

*/

179

175

bool import_key(const char *filename){

180

int ret;

181

176

int fd;

182

177

gpgme_data_t pgp_data;

183

178

479

474

static int init_gnutls_session(gnutls_session_t *session){

480

475

int ret;

481

476

/* GnuTLS session creation */

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);

477

ret = gnutls_init(session, GNUTLS_SERVER);

488

478

if(ret != GNUTLS_E_SUCCESS){

489

479

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

490

480

safer_gnutls_strerror(ret));

492

482

493

483

{

494

484

const char *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);

485

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

502

486

if(ret != GNUTLS_E_SUCCESS){

503

487

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

504

488

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

508

492

}

509

493

}

510

494

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);

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

519

497

if(ret != GNUTLS_E_SUCCESS){

520

498

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

521

499

safer_gnutls_strerror(ret));

524

502

}

525

503

526

504

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

528

507

529

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

509

535

514

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

536

515

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

537

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

538

520

/* Called when a Mandos server is found */

539

521

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

540

522

AvahiIfIndex if_index,

541

523

int af){

542

int ret, tcp_sd = -1;

524

int ret, tcp_sd;

543

525

ssize_t sret;

544

526

union {

545

527

struct sockaddr_in in;

546

528

struct sockaddr_in6 in6;

547

529

} to;

548

530

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

550

532

size_t buffer_length = 0;

551

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

552

535

size_t written;

553

int retval = -1;

536

int retval = 0;

554

537

gnutls_session_t session;

555

538

int pf; /* Protocol family */

556

539

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

540

switch(af){

565

541

case AF_INET6:

566

542

pf = PF_INET6;

570

546

break;

571

547

default:

572

548

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

573

errno = EINVAL;

574

549

return -1;

575

550

}

576

551

586

561

587

562

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

563

if(tcp_sd < 0){

589

int e = errno;

590

564

perror("socket");

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

565

return -1;

598

566

}

599

567

600

568

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

606

574

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

607

575

}

608

576

if(ret < 0 ){

609

int e = errno;

610

577

perror("inet_pton");

611

errno = e;

612

goto mandos_end;

578

return -1;

613

579

}

614

580

if(ret == 0){

615

int e = errno;

616

581

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

617

errno = e;

618

goto mandos_end;

582

return -1;

619

583

}

620

584

if(af == AF_INET6){

621

585

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

628

592

if(if_index == AVAHI_IF_UNSPEC){

629

593

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

630

594

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

595

return -1;

633

596

}

634

597

/* Set the network interface number as scope */

635

598

to.in6.sin6_scope_id = (uint32_t)if_index;

640

603

-Wunreachable-code */

641

604

}

642

605

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

648

606

if(debug){

649

607

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

650

608

char interface[IF_NAMESIZE];

677

635

}

678

636

}

679

637

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

638

if(af == AF_INET6){

686

639

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

687

640

} else {

688

641

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

689

642

}

690

643

if(ret < 0){

691

int e = errno;

692

644

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

645

return -1;

700

646

}

701

647

702

648

const char *out = mandos_protocol_version;

706

652

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

707

653

out_size - written));

708

654

if(ret == -1){

709

int e = errno;

710

655

perror("write");

711

errno = e;

656

retval = -1;

712

657

goto mandos_end;

713

658

}

714

659

written += (size_t)ret;

722

667

break;

723

668

}

724

669

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

670

}

731

671

732

672

if(debug){

733

673

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

734

674

}

735

675

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

741

676

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

677

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

678

do{

749

679

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

754

680

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

755

681

756

682

if(ret != GNUTLS_E_SUCCESS){

758

684

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

759

685

gnutls_perror(ret);

760

686

}

761

errno = EPROTO;

687

retval = -1;

762

688

goto mandos_end;

763

689

}

764

690

770

696

}

771

697

772

698

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

699

buffer_capacity = incbuffer(&buffer, buffer_length,

780

700

buffer_capacity);

781

701

if(buffer_capacity == 0){

782

int e = errno;

783

702

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

703

retval = -1;

790

704

goto mandos_end;

791

705

}

792

706

801

715

case GNUTLS_E_AGAIN:

802

716

break;

803

717

case GNUTLS_E_REHANDSHAKE:

804

do {

718

do{

805

719

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

720

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

812

721

if(ret < 0){

813

722

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

814

723

gnutls_perror(ret);

815

errno = EPROTO;

724

retval = -1;

816

725

goto mandos_end;

817

726

}

818

727

break;

819

728

default:

820

729

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

821

730

" encrypted session with Mandos server\n");

731

retval = -1;

822

732

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

733

goto mandos_end;

825

734

}

826

735

} else {

832

741

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

833

742

}

834

743

835

if(quit_now){

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);

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

745

848

746

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

850

747

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

748

buffer_length,

852

749

&decrypted_buffer);

853

750

if(decrypted_buffer_size >= 0){

854

855

751

written = 0;

856

752

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

862

753

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

863

754

(size_t)decrypted_buffer_size - written,

864

755

stdout);

865

756

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

866

int e = errno;

867

757

if(debug){

868

758

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

869

759

strerror(errno));

870

760

}

871

errno = e;

872

goto mandos_end;

761

retval = -1;

762

break;

873

763

}

874

764

written += (size_t)ret;

875

765

}

876

retval = 0;

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

877

769

}

770

} else {

771

retval = -1;

878

772

}

879

773

880

774

/* Shutdown procedure */

881

775

882

776

mandos_end:

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;

777

free(buffer);

778

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

779

if(ret == -1){

780

perror("close");

902

781

}

782

gnutls_deinit(session);

903

783

return retval;

904

784

}

905

785

968

848

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

969

849

is removed from the LAN */

970

850

971

if(quit_now){

972

return;

973

}

974

975

851

switch(event){

976

852

default:

977

853

case AVAHI_BROWSER_FAILURE:

1044

920

bool gpgme_initialized = false;

1045

921

float delay = 2.5f;

1046

922

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1048

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

925

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

1071

926

{

1072

927

struct argp_option options[] = {

1073

928

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

1102

957

.arg = "SECONDS",

1103

958

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

1104

959

.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 },

1114

960

{ .name = NULL }

1115

961

};

1116

962

1117

963

error_t parse_opt(int key, char *arg,

1118

964

struct argp_state *state){

1119

errno = 0;

1120

965

switch(key){

1121

966

case 128: /* --debug */

1122

967

debug = true;

1138

983

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

1139

984

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

1140

985

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

1141

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

986

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

987

exit(EXIT_FAILURE);

1142

988

}

1143

989

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

1144

990

break;

1149

995

errno = 0;

1150

996

delay = strtof(arg, &tmp);

1151

997

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

1152

argp_error(state, "Bad delay");

998

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

999

exit(EXIT_FAILURE);

1153

1000

}

1154

1001

break;

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);

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

case ARGP_KEY_END:

1168

1005

break;

1169

1006

default:

1170

1007

return ARGP_ERR_UNKNOWN;

1171

1008

}

1172

return errno;

1009

return 0;

1173

1010

}

1174

1011

1175

1012

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

1176

1013

.args_doc = "",

1177

1014

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

1178

1015

" passwords from a Mandos server" };

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;

1016

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

1017

if(ret == ARGP_ERR_UNKNOWN){

1018

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

1019

exitcode = EXIT_FAILURE;

1192

1020

goto end;

1193

1021

}

1194

1022

}

1204

1032

mc.simple_poll = avahi_simple_poll_new();

1205

1033

if(mc.simple_poll == NULL){

1206

1034

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

1207

exitcode = EX_UNAVAILABLE;

1035

exitcode = EXIT_FAILURE;

1208

1036

goto end;

1209

1037

}

1210

1038

1212

1040

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

1213

1041

if(ret == -1){

1214

1042

perror("sigaddset");

1215

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1216

1044

goto end;

1217

1045

}

1218

1046

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

1219

1047

if(ret == -1){

1220

1048

perror("sigaddset");

1221

exitcode = EX_OSERR;

1049

exitcode = EXIT_FAILURE;

1222

1050

goto end;

1223

1051

}

1224

1052

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

1225

1053

if(ret == -1){

1226

1054

perror("sigaddset");

1227

exitcode = EX_OSERR;

1228

goto end;

1229

}

1230

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

1231

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

1232

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

1233

*/

1234

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

1235

if(ret == -1){

1236

perror("sigaction");

1237

return EX_OSERR;

1238

}

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

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

1241

if(ret == -1){

1242

perror("sigaction");

1243

exitcode = EX_OSERR;

1244

goto end;

1245

}

1246

}

1247

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

1248

if(ret == -1){

1249

perror("sigaction");

1250

return EX_OSERR;

1251

}

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

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

1254

if(ret == -1){

1255

perror("sigaction");

1256

exitcode = EX_OSERR;

1257

goto end;

1258

}

1259

}

1260

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

1261

if(ret == -1){

1262

perror("sigaction");

1263

return EX_OSERR;

1264

}

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

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

1267

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1058

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

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

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

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

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

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1272

1075

}

1273

1076

1274

1077

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

1276

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

1080

if(if_index == 0){

1278

1081

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

1279

exitcode = EX_UNAVAILABLE;

1082

exitcode = EXIT_FAILURE;

1280

1083

goto end;

1281

1084

}

1282

1085

1284

1087

goto end;

1285

1088

}

1286

1089

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

1090

#ifdef __linux__

1295

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1092

messages to mess up the prompt */

1297

1093

ret = klogctl(8, NULL, 5);

1298

1094

bool restore_loglevel = true;

1299

1095

if(ret == -1){

1305

1101

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1102

if(sd < 0){

1307

1103

perror("socket");

1308

exitcode = EX_OSERR;

1104

exitcode = EXIT_FAILURE;

1309

1105

#ifdef __linux__

1310

1106

if(restore_loglevel){

1311

1107

ret = klogctl(7, NULL, 0);

1314

1110

}

1315

1111

}

1316

1112

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1113

goto end;

1324

1114

}

1325

1115

strcpy(network.ifr_name, interface);

1334

1124

}

1335

1125

}

1336

1126

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1127

exitcode = EXIT_FAILURE;

1344

1128

goto end;

1345

1129

}

1346

1130

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

1350

1134

if(ret == -1){

1351

1135

take_down_interface = false;

1352

1136

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1137

exitcode = EXIT_FAILURE;

1354

1138

#ifdef __linux__

1355

1139

if(restore_loglevel){

1356

1140

ret = klogctl(7, NULL, 0);

1359

1143

}

1360

1144

}

1361

1145

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1146

goto end;

1369

1147

}

1370

1148

}

1398

1176

}

1399

1177

}

1400

1178

#endif /* __linux__ */

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

}

1179

}

1180

1181

if(quit_now){

1182

goto end;

1183

}

1184

1185

uid = getuid();

1186

gid = getgid();

1187

1188

errno = 0;

1189

setgid(gid);

1190

if(ret == -1){

1191

perror("setgid");

1192

}

1193

1194

ret = setuid(uid);

1195

if(ret == -1){

1196

perror("setuid");

1416

1197

}

1417

1198

1418

1199

if(quit_now){

1422

1203

ret = init_gnutls_global(pubkey, seckey);

1423

1204

if(ret == -1){

1424

1205

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

1425

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1426

1207

goto end;

1427

1208

} else {

1428

1209

gnutls_initialized = true;

1445

1226

1446

1227

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

1447

1228

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

1448

exitcode = EX_UNAVAILABLE;

1229

exitcode = EXIT_FAILURE;

1449

1230

goto end;

1450

1231

} else {

1451

1232

gpgme_initialized = true;

1461

1242

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

1462

1243

if(address == NULL){

1463

1244

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

1464

exitcode = EX_USAGE;

1245

exitcode = EXIT_FAILURE;

1465

1246

goto end;

1466

1247

}

1467

1248

1475

1256

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

1476

1257

or tmpmax != (uint16_t)tmpmax){

1477

1258

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

1478

exitcode = EX_USAGE;

1259

exitcode = EXIT_FAILURE;

1479

1260

goto end;

1480

1261

}

1481

1262

1500

1281

1501

1282

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

1502

1283

if(ret < 0){

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

}

1284

exitcode = EXIT_FAILURE;

1522

1285

} else {

1523

1286

exitcode = EXIT_SUCCESS;

1524

1287

}

1551

1314

if(mc.server == NULL){

1552

1315

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

1553

1316

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1317

exitcode = EXIT_FAILURE;

1555

1318

goto end;

1556

1319

}

1557

1320

1566

1329

if(sb == NULL){

1567

1330

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

1568

1331

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1332

exitcode = EXIT_FAILURE;

1570

1333

goto end;

1571

1334

}

1572

1335

1610

1373

1611

1374

/* Take down the network interface */

1612

1375

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1376

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

1616

1377

if(ret == -1){

1617

perror("seteuid");

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

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

1381

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

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1618

1385

}

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

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1640

1389

}

1641

1390

}

1642

1391

1685

1434

}

1686

1435

1687

1436

if(quit_now){

1688

sigemptyset(&old_sigterm_action.sa_mask);

1689

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1437

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

1693

1438

if(ret == -1){

1694

1439

perror("sigaction");

1695

1440

}

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());

1441

raise(signal_received);

1704

1442

}

1705

1443

1706

1444

return exitcode;