/mandos/trunk : revision 24.1.154

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,

523

541

int af){

524

int ret, tcp_sd;

542

int ret, tcp_sd = -1;

525

543

ssize_t sret;

526

544

union {

527

545

struct sockaddr_in in;

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

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

540

564

switch(af){

541

565

case AF_INET6:

542

566

pf = PF_INET6;

546

570

break;

547

571

default:

548

572

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

573

errno = EINVAL;

549

574

return -1;

550

575

}

551

576

561

586

562

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

563

588

if(tcp_sd < 0){

589

int e = errno;

564

590

perror("socket");

565

return -1;

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

566

598

}

567

599

568

600

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

574

606

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

575

607

}

576

608

if(ret < 0 ){

609

int e = errno;

577

610

perror("inet_pton");

578

return -1;

611

errno = e;

612

goto mandos_end;

579

613

}

580

614

if(ret == 0){

615

int e = errno;

581

616

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

582

return -1;

617

errno = e;

618

goto mandos_end;

583

619

}

584

620

if(af == AF_INET6){

585

621

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

592

628

if(if_index == AVAHI_IF_UNSPEC){

593

629

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

594

630

" without a network interface\n");

595

return -1;

631

errno = EINVAL;

632

goto mandos_end;

596

633

}

597

634

/* Set the network interface number as scope */

598

635

to.in6.sin6_scope_id = (uint32_t)if_index;

603

640

-Wunreachable-code */

604

641

}

605

642

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

606

648

if(debug){

607

649

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

608

650

char interface[IF_NAMESIZE];

635

677

}

636

678

}

637

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

638

685

if(af == AF_INET6){

639

686

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

640

687

} else {

641

688

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

642

689

}

643

690

if(ret < 0){

691

int e = errno;

644

692

perror("connect");

645

return -1;

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

646

700

}

647

701

648

702

const char *out = mandos_protocol_version;

652

706

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

653

707

out_size - written));

654

708

if(ret == -1){

709

int e = errno;

655

710

perror("write");

656

retval = -1;

711

errno = e;

657

712

goto mandos_end;

658

713

}

659

714

written += (size_t)ret;

667

722

break;

668

723

}

669

724

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

670

730

}

671

731

672

732

if(debug){

673

733

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

674

734

}

675

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

676

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

677

742

678

do{

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

679

749

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

680

754

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

681

755

682

756

if(ret != GNUTLS_E_SUCCESS){

684

758

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

685

759

gnutls_perror(ret);

686

760

}

687

retval = -1;

761

errno = EPROTO;

688

762

goto mandos_end;

689

763

}

690

764

696

770

}

697

771

698

772

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

699

779

buffer_capacity = incbuffer(&buffer, buffer_length,

700

780

buffer_capacity);

701

781

if(buffer_capacity == 0){

782

int e = errno;

702

783

perror("incbuffer");

703

retval = -1;

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

704

790

goto mandos_end;

705

791

}

706

792

715

801

case GNUTLS_E_AGAIN:

716

802

break;

717

803

case GNUTLS_E_REHANDSHAKE:

718

do{

804

do {

719

805

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

720

811

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

721

812

if(ret < 0){

722

813

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

723

814

gnutls_perror(ret);

724

retval = -1;

815

errno = EPROTO;

725

816

goto mandos_end;

726

817

}

727

818

break;

728

819

default:

729

820

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

730

821

" encrypted session with Mandos server\n");

731

retval = -1;

732

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

733

824

goto mandos_end;

734

825

}

735

826

} else {

741

832

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

742

833

}

743

834

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

745

847

746

848

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

747

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

748

851

buffer_length,

749

852

&decrypted_buffer);

750

853

if(decrypted_buffer_size >= 0){

854

751

855

written = 0;

752

856

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

753

862

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

754

863

(size_t)decrypted_buffer_size - written,

755

864

stdout);

756

865

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

866

int e = errno;

757

867

if(debug){

758

868

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

759

869

strerror(errno));

760

870

}

761

retval = -1;

762

break;

871

errno = e;

872

goto mandos_end;

763

873

}

764

874

written += (size_t)ret;

765

875

}

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

876

retval = 0;

769

877

}

770

} else {

771

retval = -1;

772

878

}

773

879

774

880

/* Shutdown procedure */

775

881

776

882

mandos_end:

777

free(buffer);

778

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

779

if(ret == -1){

780

perror("close");

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;

781

902

}

782

gnutls_deinit(session);

783

903

return retval;

784

904

}

785

905

848

968

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

849

969

is removed from the LAN */

850

970

971

if(quit_now){

972

return;

973

}

974

851

975

switch(event){

852

976

default:

853

977

case AVAHI_BROWSER_FAILURE:

920

1044

bool gpgme_initialized = false;

921

1045

float delay = 2.5f;

922

1046

923

struct sigaction old_sigterm_action;

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

924

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

925

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

926

1071

{

927

1072

struct argp_option options[] = {

928

1073

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

957

1102

.arg = "SECONDS",

958

1103

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

959

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 },

960

1114

{ .name = NULL }

961

1115

};

962

1116

963

1117

error_t parse_opt(int key, char *arg,

964

1118

struct argp_state *state){

1119

errno = 0;

965

1120

switch(key){

966

1121

case 128: /* --debug */

967

1122

debug = true;

983

1138

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

984

1139

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

985

1140

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

986

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

987

exit(EXIT_FAILURE);

1141

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

988

1142

}

989

1143

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

990

1144

break;

995

1149

errno = 0;

996

1150

delay = strtof(arg, &tmp);

997

1151

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

998

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

999

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

1000

1153

}

1001

1154

break;

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

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);

1005

1168

break;

1006

1169

default:

1007

1170

return ARGP_ERR_UNKNOWN;

1008

1171

}

1009

return 0;

1172

return errno;

1010

1173

}

1011

1174

1012

1175

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

1013

1176

.args_doc = "",

1014

1177

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

1015

1178

" passwords from a Mandos server" };

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;

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;

1020

1192

goto end;

1021

1193

}

1022

1194

}

1032

1204

mc.simple_poll = avahi_simple_poll_new();

1033

1205

if(mc.simple_poll == NULL){

1034

1206

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

1035

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1036

1208

goto end;

1037

1209

}

1038

1210

1040

1212

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

1041

1213

if(ret == -1){

1042

1214

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1044

1216

goto end;

1045

1217

}

1046

1218

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

1047

1219

if(ret == -1){

1048

1220

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1050

1222

goto end;

1051

1223

}

1052

1224

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

1053

1225

if(ret == -1){

1054

1226

perror("sigaddset");

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;

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

}

1075

1272

}

1076

1273

1077

1274

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

1079

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1080

1277

if(if_index == 0){

1081

1278

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

1082

exitcode = EXIT_FAILURE;

1279

exitcode = EX_UNAVAILABLE;

1083

1280

goto end;

1084

1281

}

1085

1282

1087

1284

goto end;

1088

1285

}

1089

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1090

1294

#ifdef __linux__

1091

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1092

messages to mess up the prompt */

1296

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

1093

1297

ret = klogctl(8, NULL, 5);

1094

1298

bool restore_loglevel = true;

1095

1299

if(ret == -1){

1101

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1102

1306

if(sd < 0){

1103

1307

perror("socket");

1104

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1105

1309

#ifdef __linux__

1106

1310

if(restore_loglevel){

1107

1311

ret = klogctl(7, NULL, 0);

1110

1314

}

1111

1315

}

1112

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1113

1323

goto end;

1114

1324

}

1115

1325

strcpy(network.ifr_name, interface);

1124

1334

}

1125

1335

}

1126

1336

#endif /* __linux__ */

1127

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

}

1128

1344

goto end;

1129

1345

}

1130

1346

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

1134

1350

if(ret == -1){

1135

1351

take_down_interface = false;

1136

1352

perror("ioctl SIOCSIFFLAGS");

1137

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1138

1354

#ifdef __linux__

1139

1355

if(restore_loglevel){

1140

1356

ret = klogctl(7, NULL, 0);

1143

1359

}

1144

1360

}

1145

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1146

1368

goto end;

1147

1369

}

1148

1370

}

1176

1398

}

1177

1399

}

1178

1400

#endif /* __linux__ */

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");

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

}

1197

1416

}

1198

1417

1199

1418

if(quit_now){

1203

1422

ret = init_gnutls_global(pubkey, seckey);

1204

1423

if(ret == -1){

1205

1424

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

1206

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1207

1426

goto end;

1208

1427

} else {

1209

1428

gnutls_initialized = true;

1226

1445

1227

1446

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

1228

1447

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

1229

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1230

1449

goto end;

1231

1450

} else {

1232

1451

gpgme_initialized = true;

1242

1461

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

1243

1462

if(address == NULL){

1244

1463

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

1245

exitcode = EXIT_FAILURE;

1464

exitcode = EX_USAGE;

1246

1465

goto end;

1247

1466

}

1248

1467

1256

1475

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

1257

1476

or tmpmax != (uint16_t)tmpmax){

1258

1477

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

1259

exitcode = EXIT_FAILURE;

1478

exitcode = EX_USAGE;

1260

1479

goto end;

1261

1480

}

1262

1481

1281

1500

1282

1501

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

1283

1502

if(ret < 0){

1284

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

}

1285

1522

} else {

1286

1523

exitcode = EXIT_SUCCESS;

1287

1524

}

1314

1551

if(mc.server == NULL){

1315

1552

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

1316

1553

avahi_strerror(error));

1317

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1318

1555

goto end;

1319

1556

}

1320

1557

1329

1566

if(sb == NULL){

1330

1567

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

1331

1568

avahi_strerror(avahi_server_errno(mc.server)));

1332

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1333

1570

goto end;

1334

1571

}

1335

1572

1373

1610

1374

1611

/* Take down the network interface */

1375

1612

if(take_down_interface){

1376

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

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1377

1616

if(ret == -1){

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

}

1617

perror("seteuid");

1385

1618

}

1386

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

1387

if(ret == -1){

1388

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

}

1389

1640

}

1390

1641

}

1391

1642

1434

1685

}

1435

1686

1436

1687

if(quit_now){

1437

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

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));

1438

1693

if(ret == -1){

1439

1694

perror("sigaction");

1440

1695

}

1441

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());

1442

1704

}

1443

1705

1444

1706

return exitcode;