/mandos/release : revision 269.1.3

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() */

47

srand(), 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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

86

#ifdef __linux__

87

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

125

static const char mandos_protocol_version[] = "1";

126

const char *argp_program_version = "mandos-client " VERSION;

127

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

128

static const char sys_class_net[] = "/sys/class/net";

129

char *connect_to = NULL;

128

130

129

131

/* Used for passing in values through the Avahi callback functions */

130

132

typedef struct {

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

249

254

return false;

250

255

}

251

256

252

return true;

257

return true;

253

258

}

254

259

255

260

/*

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

518

539

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

519

540

AvahiIfIndex if_index,

520

541

int af){

521

int ret, tcp_sd;

542

int ret, tcp_sd = -1;

522

543

ssize_t sret;

523

544

union {

524

545

struct sockaddr_in in;

525

546

struct sockaddr_in6 in6;

526

547

} to;

527

548

char *buffer = NULL;

528

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

529

550

size_t buffer_length = 0;

530

551

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

552

size_t written;

533

int retval = 0;

553

int retval = -1;

534

554

gnutls_session_t session;

535

555

int pf; /* Protocol family */

536

556

557

if(quit_now){

558

return -1;

559

}

560

537

561

switch(af){

538

562

case AF_INET6:

539

563

pf = PF_INET6;

559

583

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

584

if(tcp_sd < 0){

561

585

perror("socket");

562

return -1;

586

goto mandos_end;

587

}

588

589

if(quit_now){

590

goto mandos_end;

563

591

}

564

592

565

593

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

572

600

}

573

601

if(ret < 0 ){

574

602

perror("inet_pton");

575

return -1;

603

goto mandos_end;

576

604

}

577

605

if(ret == 0){

578

606

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

579

return -1;

607

goto mandos_end;

580

608

}

581

609

if(af == AF_INET6){

582

610

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

589

617

if(if_index == AVAHI_IF_UNSPEC){

590

618

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

591

619

" without a network interface\n");

592

return -1;

620

goto mandos_end;

593

621

}

594

622

/* Set the network interface number as scope */

595

623

to.in6.sin6_scope_id = (uint32_t)if_index;

600

628

-Wunreachable-code */

601

629

}

602

630

631

if(quit_now){

632

goto mandos_end;

633

}

634

603

635

if(debug){

604

636

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

605

637

char interface[IF_NAMESIZE];

632

664

}

633

665

}

634

666

667

if(quit_now){

668

goto mandos_end;

669

}

670

635

671

if(af == AF_INET6){

636

672

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

637

673

} else {

639

675

}

640

676

if(ret < 0){

641

677

perror("connect");

642

return -1;

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

643

683

}

644

684

645

685

const char *out = mandos_protocol_version;

650

690

out_size - written));

651

691

if(ret == -1){

652

692

perror("write");

653

retval = -1;

654

693

goto mandos_end;

655

694

}

656

695

written += (size_t)ret;

664

703

break;

665

704

}

666

705

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

667

710

}

668

711

669

712

if(debug){

670

713

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

671

714

}

672

715

716

if(quit_now){

717

goto mandos_end;

718

}

719

673

720

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

721

675

do{

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

676

727

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

677

731

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

678

732

679

733

if(ret != GNUTLS_E_SUCCESS){

681

735

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

682

736

gnutls_perror(ret);

683

737

}

684

retval = -1;

685

738

goto mandos_end;

686

739

}

687

740

693

746

}

694

747

695

748

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

696

754

buffer_capacity = incbuffer(&buffer, buffer_length,

697

755

buffer_capacity);

698

756

if(buffer_capacity == 0){

699

757

perror("incbuffer");

700

retval = -1;

758

goto mandos_end;

759

}

760

761

if(quit_now){

701

762

goto mandos_end;

702

763

}

703

764

712

773

case GNUTLS_E_AGAIN:

713

774

break;

714

775

case GNUTLS_E_REHANDSHAKE:

715

do{

776

do {

716

777

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

717

782

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

718

783

if(ret < 0){

719

784

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

720

785

gnutls_perror(ret);

721

retval = -1;

722

786

goto mandos_end;

723

787

}

724

788

break;

725

789

default:

726

790

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

727

791

" encrypted session with Mandos server\n");

728

retval = -1;

729

792

gnutls_bye(session, GNUTLS_SHUT_RDWR);

730

793

goto mandos_end;

731

794

}

738

801

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

739

802

}

740

803

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

804

if(quit_now){

805

goto mandos_end;

806

}

807

808

do {

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

if(quit_now){

811

goto mandos_end;

812

}

813

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

742

814

743

815

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

744

817

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

818

buffer_length,

746

819

&decrypted_buffer);

747

820

if(decrypted_buffer_size >= 0){

821

748

822

written = 0;

749

823

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

750

828

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

751

829

(size_t)decrypted_buffer_size - written,

752

830

stdout);

755

833

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

756

834

strerror(errno));

757

835

}

758

retval = -1;

759

break;

836

goto mandos_end;

760

837

}

761

838

written += (size_t)ret;

762

839

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

840

retval = 0;

766

841

}

767

} else {

768

retval = -1;

769

842

}

770

843

771

844

/* Shutdown procedure */

772

845

773

846

mandos_end:

847

free(decrypted_buffer);

774

848

free(buffer);

775

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

849

if(tcp_sd >= 0){

850

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

851

}

776

852

if(ret == -1){

777

853

perror("close");

778

854

}

779

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

780

859

return retval;

781

860

}

782

861

799

878

/* Called whenever a service has been resolved successfully or

800

879

timed out */

801

880

881

if(quit_now){

882

return;

883

}

884

802

885

switch(event){

803

886

default:

804

887

case AVAHI_RESOLVER_FAILURE:

841

924

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

842

925

is removed from the LAN */

843

926

927

if(quit_now){

928

return;

929

}

930

844

931

switch(event){

845

932

default:

846

933

case AVAHI_BROWSER_FAILURE:

875

962

}

876

963

}

877

964

878

sig_atomic_t quit_now = 0;

879

880

965

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

881

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

966

static void handle_sigterm(int sig){

882

967

if(quit_now){

883

968

return;

884

969

}

885

970

quit_now = 1;

971

signal_received = sig;

886

972

int old_errno = errno;

887

973

if(mc.simple_poll != NULL){

888

974

avahi_simple_poll_quit(mc.simple_poll);

890

976

errno = old_errno;

891

977

}

892

978

979

/*

980

* This function determines if a directory entry in /sys/class/net

981

* corresponds to an acceptable network device.

982

* (This function is passed to scandir(3) as a filter function.)

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

if(if_entry->d_name[0] == '.'){

994

return 0;

995

}

996

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1002

/* read line from flags_fd */

1003

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1004

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1005

flagstring[(size_t)to_read] = '\0';

1006

if(flagstring == NULL){

1007

perror("malloc");

1008

close(flags_fd);

1009

return 0;

1010

}

1011

while(to_read > 0){

1012

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1013

(size_t)to_read));

1014

if(ssret == -1){

1015

perror("read");

1016

free(flagstring);

1017

close(flags_fd);

1018

return 0;

1019

}

1020

to_read -= ssret;

1021

if(ssret == 0){

1022

break;

1023

}

1024

}

1025

close(flags_fd);

1026

intmax_t tmpmax;

1027

char *tmp;

1028

errno = 0;

1029

tmpmax = strtoimax(flagstring, &tmp, 0);

1030

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

1031

and not (isspace(*tmp)))

1032

or tmpmax != (ifreq_flags)tmpmax){

1033

if(debug){

1034

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1035

flagstring, if_entry->d_name);

1036

}

1037

free(flagstring);

1038

return 0;

1039

}

1040

free(flagstring);

1041

ifreq_flags flags = (ifreq_flags)tmpmax;

1042

/* Reject the loopback device */

1043

if(flags & IFF_LOOPBACK){

1044

if(debug){

1045

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1046

if_entry->d_name);

1047

}

1048

return 0;

1049

}

1050

/* Accept point-to-point devices only if connect_to is specified */

1051

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1052

if(debug){

1053

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1054

if_entry->d_name);

1055

}

1056

return 1;

1057

}

1058

/* Otherwise, reject non-broadcast-capable devices */

1059

if(not (flags & IFF_BROADCAST)){

1060

if(debug){

1061

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1062

if_entry->d_name);

1063

}

1064

return 0;

1065

}

1066

/* Accept this device */

1067

if(debug){

1068

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1069

if_entry->d_name);

1070

}

1071

return 1;

1072

}

1073

893

1074

int main(int argc, char *argv[]){

894

1075

AvahiSServiceBrowser *sb = NULL;

895

1076

int error;

897

1078

intmax_t tmpmax;

898

1079

char *tmp;

899

1080

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1081

const char *interface = "";

901

1082

struct ifreq network;

902

1083

int sd = -1;

903

bool interface_taken_up = false;

1084

bool take_down_interface = false;

904

1085

uid_t uid;

905

1086

gid_t gid;

906

char *connect_to = NULL;

907

1087

char tempdir[] = "/tmp/mandosXXXXXX";

908

1088

bool tempdir_created = false;

909

1089

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1094

bool gpgme_initialized = false;

915

1095

float delay = 2.5f;

916

1096

917

struct sigaction old_sigterm_action;

1097

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

1098

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

919

1099

1100

uid = getuid();

1101

gid = getgid();

1102

1103

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

1104

errno = 0;

1105

ret = setgid(gid);

1106

if(ret == -1){

1107

perror("setgid");

1108

}

1109

1110

/* Lower user privileges (temporarily) */

1111

errno = 0;

1112

ret = seteuid(uid);

1113

if(ret == -1){

1114

perror("seteuid");

1115

}

1116

1117

if(quit_now){

1118

goto end;

1119

}

1120

920

1121

{

921

1122

struct argp_option options[] = {

922

1123

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

1018

1219

if(not debug){

1019

1220

avahi_set_log_function(empty_log);

1020

1221

}

1222

1223

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

1224

struct dirent **direntries;

1225

ret = scandir(sys_class_net, &direntries, good_interface,

1226

alphasort);

1227

if(ret >= 1){

1228

/* Pick the first good interface */

1229

interface = strdup(direntries[0]->d_name);

1230

if(debug){

1231

fprintf(stderr, "Using interface \"%s\"\n", interface);

1232

}

1233

if(interface == NULL){

1234

perror("malloc");

1235

free(direntries);

1236

exitcode = EXIT_FAILURE;

1237

goto end;

1238

}

1239

free(direntries);

1240

} else {

1241

free(direntries);

1242

fprintf(stderr, "Could not find a network interface\n");

1243

exitcode = EXIT_FAILURE;

1244

goto end;

1245

}

1246

}

1021

1247

1022

1248

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

1023

1249

from the signal handler */

1049

1275

exitcode = EXIT_FAILURE;

1050

1276

goto end;

1051

1277

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1278

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

1279

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

1280

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

1281

*/

1282

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

1283

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1286

}

1287

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

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

1289

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1292

goto end;

1293

}

1294

}

1295

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

1296

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1299

}

1300

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

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

1302

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1305

goto end;

1306

}

1307

}

1308

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

1309

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1312

}

1313

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

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

1315

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1318

goto end;

1319

}

1320

}

1058

1321

1059

1322

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

1060

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

1323

if(strcmp(interface, "none") != 0){

1324

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

if(if_index == 0){

1326

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

1327

exitcode = EXIT_FAILURE;

1328

goto end;

1329

}

1330

1331

if(quit_now){

1332

goto end;

1333

}

1334

1335

/* Re-raise priviliges */

1336

errno = 0;

1337

ret = seteuid(0);

1338

if(ret == -1){

1339

perror("seteuid");

1340

}

1341

1061

1342

#ifdef __linux__

1062

1343

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

1344

messages to mess up the prompt */

1081

1362

}

1082

1363

}

1083

1364

#endif /* __linux__ */

1365

/* Lower privileges */

1366

errno = 0;

1367

ret = seteuid(uid);

1368

if(ret == -1){

1369

perror("seteuid");

1370

}

1084

1371

goto end;

1085

1372

}

1086

1373

strcpy(network.ifr_name, interface);

1096

1383

}

1097

1384

#endif /* __linux__ */

1098

1385

exitcode = EXIT_FAILURE;

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1099

1392

goto end;

1100

1393

}

1101

1394

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

1102

1395

network.ifr_flags |= IFF_UP;

1396

take_down_interface = true;

1103

1397

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

1104

1398

if(ret == -1){

1105

perror("ioctl SIOCSIFFLAGS");

1399

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1106

1401

exitcode = EXIT_FAILURE;

1107

1402

#ifdef __linux__

1108

1403

if(restore_loglevel){

1112

1407

}

1113

1408

}

1114

1409

#endif /* __linux__ */

1410

/* Lower privileges */

1411

errno = 0;

1412

ret = seteuid(uid);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1115

1416

goto end;

1116

1417

}

1117

interface_taken_up = true;

1118

1418

}

1119

1419

/* sleep checking until interface is running */

1120

1420

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

1130

1430

perror("nanosleep");

1131

1431

}

1132

1432

}

1133

if(not interface_taken_up){

1433

if(not take_down_interface){

1434

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

1134

1435

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

1135

1436

if(ret == -1){

1136

1437

perror("close");

1145

1446

}

1146

1447

}

1147

1448

#endif /* __linux__ */

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");

1449

/* Lower privileges */

1450

errno = 0;

1451

if(take_down_interface){

1452

/* Lower privileges */

1453

ret = seteuid(uid);

1454

if(ret == -1){

1455

perror("seteuid");

1456

}

1457

} else {

1458

/* Lower privileges permanently */

1459

ret = setuid(uid);

1460

if(ret == -1){

1461

perror("setuid");

1462

}

1463

}

1464

}

1465

1466

if(quit_now){

1467

goto end;

1162

1468

}

1163

1469

1164

1470

ret = init_gnutls_global(pubkey, seckey);

1170

1476

gnutls_initialized = true;

1171

1477

}

1172

1478

1479

if(quit_now){

1480

goto end;

1481

}

1482

1483

tempdir_created = true;

1173

1484

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1174

1486

perror("mkdtemp");

1175

1487

goto end;

1176

1488

}

1177

tempdir_created = true;

1489

1490

if(quit_now){

1491

goto end;

1492

}

1178

1493

1179

1494

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

1180

1495

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

1184

1499

gpgme_initialized = true;

1185

1500

}

1186

1501

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

}

1502

if(quit_now){

1503

goto end;

1194

1504

}

1195

1505

1196

1506

if(connect_to != NULL){

1202

1512

exitcode = EXIT_FAILURE;

1203

1513

goto end;

1204

1514

}

1515

1516

if(quit_now){

1517

goto end;

1518

}

1519

1205

1520

uint16_t port;

1206

1521

errno = 0;

1207

1522

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

1211

1526

exitcode = EXIT_FAILURE;

1212

1527

goto end;

1213

1528

}

1529

1530

if(quit_now){

1531

goto end;

1532

}

1533

1214

1534

port = (uint16_t)tmpmax;

1215

1535

*address = '\0';

1216

1536

address = connect_to;

1221

1541

} else {

1222

1542

af = AF_INET;

1223

1543

}

1544

1545

if(quit_now){

1546

goto end;

1547

}

1548

1224

1549

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

1225

1550

if(ret < 0){

1226

1551

exitcode = EXIT_FAILURE;

1229

1554

}

1230

1555

goto end;

1231

1556

}

1232

1557

1558

if(quit_now){

1559

goto end;

1560

}

1561

1233

1562

{

1234

1563

AvahiServerConfig config;

1235

1564

/* Do not publish any local Zeroconf records */

1256

1585

goto end;

1257

1586

}

1258

1587

1588

if(quit_now){

1589

goto end;

1590

}

1591

1259

1592

/* Create the Avahi service browser */

1260

1593

sb = avahi_s_service_browser_new(mc.server, if_index,

1261

1594

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1267

1600

goto end;

1268

1601

}

1269

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1270

1607

/* Run the main loop */

1271

1608

1272

1609

if(debug){

1302

1639

}

1303

1640

1304

1641

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1642

if(take_down_interface){

1643

/* Re-raise priviliges */

1644

errno = 0;

1645

ret = seteuid(0);

1307

1646

if(ret == -1){

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

}

1647

perror("seteuid");

1315

1648

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1649

if(geteuid() == 0){

1650

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

1651

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_UP) {

1654

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

1655

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

1656

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1658

}

1659

}

1660

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

1661

if(ret == -1){

1662

perror("close");

1663

}

1664

/* Lower privileges permanently */

1665

errno = 0;

1666

ret = setuid(uid);

1667

if(ret == -1){

1668

perror("setuid");

1669

}

1319

1670

}

1320

1671

}

1321

1672

1363

1714

}

1364

1715

}

1365

1716

1717

if(quit_now){

1718

sigemptyset(&old_sigterm_action.sa_mask);

1719

old_sigterm_action.sa_handler = SIG_DFL;

1720

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1721

&old_sigterm_action,

1722

NULL));

1723

if(ret == -1){

1724

perror("sigaction");

1725

}

1726

do {

1727

ret = raise(signal_received);

1728

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

1729

if(ret != 0){

1730

perror("raise");

1731

abort();

1732

}

1733

TEMP_FAILURE_RETRY(pause());

1734

}

1735

1366

1736

return exitcode;

1367

1737

}