/mandos/trunk : revision 321

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() */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

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;

130

128

131

129

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

132

130

typedef struct {

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

254

249

return false;

255

250

}

256

251

257

return true;

252

return true;

258

253

}

259

254

260

255

/*

314

309

}

315

310

gpgme_recipient_t recipient;

316

311

recipient = result->recipients;

317

while(recipient != NULL){

318

fprintf(stderr, "Public key algorithm: %s\n",

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

321

fprintf(stderr, "Secret key available: %s\n",

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

312

if(recipient){

313

while(recipient != NULL){

314

fprintf(stderr, "Public key algorithm: %s\n",

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

317

fprintf(stderr, "Secret key available: %s\n",

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

325

322

}

326

323

}

327

324

}

479

476

static int init_gnutls_session(gnutls_session_t *session){

480

477

int ret;

481

478

/* 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);

479

ret = gnutls_init(session, GNUTLS_SERVER);

488

480

if(ret != GNUTLS_E_SUCCESS){

489

481

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

490

482

safer_gnutls_strerror(ret));

492

484

493

485

{

494

486

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);

487

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

502

488

if(ret != GNUTLS_E_SUCCESS){

503

489

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

504

490

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

508

494

}

509

495

}

510

496

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

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

519

499

if(ret != GNUTLS_E_SUCCESS){

520

500

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

521

501

safer_gnutls_strerror(ret));

524

504

}

525

505

526

506

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

528

509

529

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

511

539

520

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

540

521

AvahiIfIndex if_index,

541

522

int af){

542

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

543

524

ssize_t sret;

544

525

union {

545

526

struct sockaddr_in in;

546

527

struct sockaddr_in6 in6;

547

528

} to;

548

529

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

550

531

size_t buffer_length = 0;

551

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

552

534

size_t written;

553

int retval = -1;

535

int retval = 0;

554

536

gnutls_session_t session;

555

537

int pf; /* Protocol family */

556

538

557

if(quit_now){

558

return -1;

559

}

560

561

539

switch(af){

562

540

case AF_INET6:

563

541

pf = PF_INET6;

583

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

562

if(tcp_sd < 0){

585

563

perror("socket");

586

goto mandos_end;

587

}

588

589

if(quit_now){

590

goto mandos_end;

564

return -1;

591

565

}

592

566

593

567

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

594

568

if(af == AF_INET6){

595

to.in6.sin6_family = (sa_family_t)af;

569

to.in6.sin6_family = (uint16_t)af;

596

570

ret = inet_pton(af, ip, &to.in6.sin6_addr);

597

571

} else { /* IPv4 */

598

572

to.in.sin_family = (sa_family_t)af;

600

574

}

601

575

if(ret < 0 ){

602

576

perror("inet_pton");

603

goto mandos_end;

577

return -1;

604

578

}

605

579

if(ret == 0){

606

580

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

607

goto mandos_end;

581

return -1;

608

582

}

609

583

if(af == AF_INET6){

610

584

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

617

591

if(if_index == AVAHI_IF_UNSPEC){

618

592

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

619

593

" without a network interface\n");

620

goto mandos_end;

594

return -1;

621

595

}

622

596

/* Set the network interface number as scope */

623

597

to.in6.sin6_scope_id = (uint32_t)if_index;

628

602

-Wunreachable-code */

629

603

}

630

604

631

if(quit_now){

632

goto mandos_end;

633

}

634

635

605

if(debug){

636

606

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

637

607

char interface[IF_NAMESIZE];

664

634

}

665

635

}

666

636

667

if(quit_now){

668

goto mandos_end;

669

}

670

671

637

if(af == AF_INET6){

672

638

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

673

639

} else {

675

641

}

676

642

if(ret < 0){

677

643

perror("connect");

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

644

return -1;

683

645

}

684

646

685

647

const char *out = mandos_protocol_version;

690

652

out_size - written));

691

653

if(ret == -1){

692

654

perror("write");

655

retval = -1;

693

656

goto mandos_end;

694

657

}

695

658

written += (size_t)ret;

703

666

break;

704

667

}

705

668

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

710

669

}

711

670

712

671

if(debug){

713

672

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

714

673

}

715

674

716

if(quit_now){

717

goto mandos_end;

718

}

719

720

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

676

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

677

do{

727

678

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

731

679

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

732

680

733

681

if(ret != GNUTLS_E_SUCCESS){

735

683

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

736

684

gnutls_perror(ret);

737

685

}

686

retval = -1;

738

687

goto mandos_end;

739

688

}

740

689

746

695

}

747

696

748

697

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

698

buffer_capacity = incbuffer(&buffer, buffer_length,

755

699

buffer_capacity);

756

700

if(buffer_capacity == 0){

757

701

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

702

retval = -1;

762

703

goto mandos_end;

763

704

}

764

705

773

714

case GNUTLS_E_AGAIN:

774

715

break;

775

716

case GNUTLS_E_REHANDSHAKE:

776

do {

717

do{

777

718

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

782

719

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

783

720

if(ret < 0){

784

721

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

785

722

gnutls_perror(ret);

723

retval = -1;

786

724

goto mandos_end;

787

725

}

788

726

break;

789

727

default:

790

728

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

791

729

" encrypted session with Mandos server\n");

730

retval = -1;

792

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

793

732

goto mandos_end;

794

733

}

801

740

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

802

741

}

803

742

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);

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

814

744

815

745

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

817

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

747

buffer_length,

819

748

&decrypted_buffer);

820

749

if(decrypted_buffer_size >= 0){

821

822

750

written = 0;

823

751

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

828

752

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

829

753

(size_t)decrypted_buffer_size - written,

830

754

stdout);

833

757

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

834

758

strerror(errno));

835

759

}

836

goto mandos_end;

760

retval = -1;

761

break;

837

762

}

838

763

written += (size_t)ret;

839

764

}

840

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

841

768

}

769

} else {

770

retval = -1;

842

771

}

843

772

844

773

/* Shutdown procedure */

845

774

846

775

mandos_end:

847

free(decrypted_buffer);

848

776

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

777

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

852

778

if(ret == -1){

853

779

perror("close");

854

780

}

855

781

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

782

return retval;

860

783

}

861

784

878

801

/* Called whenever a service has been resolved successfully or

879

802

timed out */

880

803

881

if(quit_now){

882

return;

883

}

884

885

804

switch(event){

886

805

default:

887

806

case AVAHI_RESOLVER_FAILURE:

924

843

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

925

844

is removed from the LAN */

926

845

927

if(quit_now){

928

return;

929

}

930

931

846

switch(event){

932

847

default:

933

848

case AVAHI_BROWSER_FAILURE:

962

877

}

963

878

}

964

879

880

sig_atomic_t quit_now = 0;

881

965

882

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

966

static void handle_sigterm(int sig){

883

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

967

884

if(quit_now){

968

885

return;

969

886

}

970

887

quit_now = 1;

971

signal_received = sig;

972

888

int old_errno = errno;

973

889

if(mc.simple_poll != NULL){

974

890

avahi_simple_poll_quit(mc.simple_poll);

976

892

errno = old_errno;

977

893

}

978

894

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);

1005

if(flagstring == NULL){

1006

perror("malloc");

1007

close(flags_fd);

1008

return 0;

1009

}

1010

while(to_read > 0){

1011

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

1012

(size_t)to_read));

1013

if(ssret == -1){

1014

perror("read");

1015

free(flagstring);

1016

close(flags_fd);

1017

return 0;

1018

}

1019

to_read -= ssret;

1020

if(ssret == 0){

1021

break;

1022

}

1023

}

1024

close(flags_fd);

1025

intmax_t tmpmax;

1026

char *tmp;

1027

errno = 0;

1028

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

1029

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

1030

and not (isspace(*tmp)))

1031

or tmpmax != (ifreq_flags)tmpmax){

1032

free(flagstring);

1033

return 0;

1034

}

1035

free(flagstring);

1036

ifreq_flags flags = (ifreq_flags)tmpmax;

1037

/* Reject the loopback device */

1038

if(flags & IFF_LOOPBACK){

1039

return 0;

1040

}

1041

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

1042

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

1043

return 1;

1044

}

1045

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

1046

if(not (flags & IFF_BROADCAST)){

1047

return 0;

1048

}

1049

/* Accept this device */

1050

return 1;

1051

}

1052

1053

895

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

1054

896

AvahiSServiceBrowser *sb = NULL;

1055

897

int error;

1057

899

intmax_t tmpmax;

1058

900

char *tmp;

1059

901

int exitcode = EXIT_SUCCESS;

1060

const char *interface = "";

902

const char *interface = "eth0";

1061

903

struct ifreq network;

1062

int sd = -1;

1063

bool take_down_interface = false;

904

int sd;

1064

905

uid_t uid;

1065

906

gid_t gid;

907

char *connect_to = NULL;

1066

908

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

1067

909

bool tempdir_created = false;

1068

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1073

915

bool gpgme_initialized = false;

1074

916

float delay = 2.5f;

1075

917

1076

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1077

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1078

920

1079

uid = getuid();

1080

gid = getgid();

1081

1082

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

1083

errno = 0;

1084

ret = setgid(gid);

1085

if(ret == -1){

1086

perror("setgid");

1087

}

1088

1089

/* Lower user privileges (temporarily) */

1090

errno = 0;

1091

ret = seteuid(uid);

1092

if(ret == -1){

1093

perror("seteuid");

1094

}

1095

1096

if(quit_now){

1097

goto end;

1098

}

1099

1100

921

{

1101

922

struct argp_option options[] = {

1102

923

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

1198

1019

if(not debug){

1199

1020

avahi_set_log_function(empty_log);

1200

1021

}

1201

1202

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

1203

struct dirent **direntries;

1204

ret = scandir(sys_class_net, &direntries, good_interface,

1205

alphasort);

1206

if(ret >= 1){

1207

/* Pick the first good interface */

1208

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

1209

if(interface == NULL){

1210

perror("malloc");

1211

free(direntries);

1212

exitcode = EXIT_FAILURE;

1213

goto end;

1214

}

1215

free(direntries);

1216

} else {

1217

free(direntries);

1218

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

1219

exitcode = EXIT_FAILURE;

1220

goto end;

1221

}

1222

}

1223

1022

1224

1023

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

1225

1024

from the signal handler */

1251

1050

exitcode = EXIT_FAILURE;

1252

1051

goto end;

1253

1052

}

1254

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

1255

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

1256

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

1257

*/

1258

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

1259

if(ret == -1){

1260

perror("sigaction");

1261

return EXIT_FAILURE;

1262

}

1263

if(old_sigterm_action.sa_handler != SIG_IGN){

1264

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

1265

if(ret == -1){

1266

perror("sigaction");

1267

exitcode = EXIT_FAILURE;

1268

goto end;

1269

}

1270

}

1271

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

1272

if(ret == -1){

1273

perror("sigaction");

1274

return EXIT_FAILURE;

1275

}

1276

if(old_sigterm_action.sa_handler != SIG_IGN){

1277

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

1278

if(ret == -1){

1279

perror("sigaction");

1280

exitcode = EXIT_FAILURE;

1281

goto end;

1282

}

1283

}

1284

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

1285

if(ret == -1){

1286

perror("sigaction");

1287

return EXIT_FAILURE;

1288

}

1289

if(old_sigterm_action.sa_handler != SIG_IGN){

1290

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

1291

if(ret == -1){

1292

perror("sigaction");

1293

exitcode = EXIT_FAILURE;

1294

goto end;

1295

}

1296

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1297

1059

1298

1060

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

1299

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

1300

if_index = (AvahiIfIndex) if_nametoindex(interface);

1301

if(if_index == 0){

1302

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

1303

exitcode = EXIT_FAILURE;

1304

goto end;

1305

}

1306

1307

if(quit_now){

1308

goto end;

1309

}

1310

1311

/* Re-raise priviliges */

1312

errno = 0;

1313

ret = seteuid(0);

1314

if(ret == -1){

1315

perror("seteuid");

1316

}

1317

1061

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

1318

1062

#ifdef __linux__

1319

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1320

1064

messages to mess up the prompt */

1338

1082

}

1339

1083

}

1340

1084

#endif /* __linux__ */

1341

/* Lower privileges */

1342

errno = 0;

1343

ret = seteuid(uid);

1344

if(ret == -1){

1345

perror("seteuid");

1346

}

1347

1085

goto end;

1348

1086

}

1349

1087

strcpy(network.ifr_name, interface);

1359

1097

}

1360

1098

#endif /* __linux__ */

1361

1099

exitcode = EXIT_FAILURE;

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1100

goto end;

1369

1101

}

1370

1102

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

1371

1103

network.ifr_flags |= IFF_UP;

1372

take_down_interface = true;

1373

1104

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

1374

1105

if(ret == -1){

1375

take_down_interface = false;

1376

1106

perror("ioctl SIOCSIFFLAGS");

1377

1107

exitcode = EXIT_FAILURE;

1378

1108

#ifdef __linux__

1383

1113

}

1384

1114

}

1385

1115

#endif /* __linux__ */

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1392

1116

goto end;

1393

1117

}

1394

1118

}

1406

1130

perror("nanosleep");

1407

1131

}

1408

1132

}

1409

if(not take_down_interface){

1410

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

1411

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

1412

if(ret == -1){

1413

perror("close");

1414

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1415

1136

}

1416

1137

#ifdef __linux__

1417

1138

if(restore_loglevel){

1422

1143

}

1423

1144

}

1424

1145

#endif /* __linux__ */

1425

/* Lower privileges */

1426

errno = 0;

1427

if(take_down_interface){

1428

/* Lower privileges */

1429

ret = seteuid(uid);

1430

if(ret == -1){

1431

perror("seteuid");

1432

}

1433

} else {

1434

/* Lower privileges permanently */

1435

ret = setuid(uid);

1436

if(ret == -1){

1437

perror("setuid");

1438

}

1439

}

1440

}

1441

1442

if(quit_now){

1443

goto end;

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1444

1160

}

1445

1161

1446

1162

ret = init_gnutls_global(pubkey, seckey);

1452

1168

gnutls_initialized = true;

1453

1169

}

1454

1170

1455

if(quit_now){

1456

goto end;

1457

}

1458

1459

tempdir_created = true;

1460

1171

if(mkdtemp(tempdir) == NULL){

1461

tempdir_created = false;

1462

1172

perror("mkdtemp");

1463

1173

goto end;

1464

1174

}

1465

1466

if(quit_now){

1467

goto end;

1468

}

1175

tempdir_created = true;

1469

1176

1470

1177

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

1471

1178

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

1475

1182

gpgme_initialized = true;

1476

1183

}

1477

1184

1478

if(quit_now){

1479

goto end;

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1480

1192

}

1481

1193

1482

1194

if(connect_to != NULL){

1488

1200

exitcode = EXIT_FAILURE;

1489

1201

goto end;

1490

1202

}

1491

1492

if(quit_now){

1493

goto end;

1494

}

1495

1496

1203

uint16_t port;

1497

1204

errno = 0;

1498

1205

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

1502

1209

exitcode = EXIT_FAILURE;

1503

1210

goto end;

1504

1211

}

1505

1506

if(quit_now){

1507

goto end;

1508

}

1509

1510

1212

port = (uint16_t)tmpmax;

1511

1213

*address = '\0';

1512

1214

address = connect_to;

1517

1219

} else {

1518

1220

af = AF_INET;

1519

1221

}

1520

1521

if(quit_now){

1522

goto end;

1523

}

1524

1525

1222

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

1526

1223

if(ret < 0){

1527

1224

exitcode = EXIT_FAILURE;

1530

1227

}

1531

1228

goto end;

1532

1229

}

1533

1534

if(quit_now){

1535

goto end;

1536

}

1537

1230

1538

1231

{

1539

1232

AvahiServerConfig config;

1540

1233

/* Do not publish any local Zeroconf records */

1561

1254

goto end;

1562

1255

}

1563

1256

1564

if(quit_now){

1565

goto end;

1566

}

1567

1568

1257

/* Create the Avahi service browser */

1569

1258

sb = avahi_s_service_browser_new(mc.server, if_index,

1570

1259

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1576

1265

goto end;

1577

1266

}

1578

1267

1579

if(quit_now){

1580

goto end;

1581

}

1582

1583

1268

/* Run the main loop */

1584

1269

1585

1270

if(debug){

1614

1299

gpgme_release(mc.ctx);

1615

1300

}

1616

1301

1617

/* Take down the network interface */

1618

if(take_down_interface){

1619

/* Re-raise priviliges */

1620

errno = 0;

1621

ret = seteuid(0);

1622

if(ret == -1){

1623

perror("seteuid");

1624

}

1625

if(geteuid() == 0){

1626

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

1627

if(ret == -1){

1628

perror("ioctl SIOCGIFFLAGS");

1629

} else if(network.ifr_flags & IFF_UP) {

1630

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

1631

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

1632

if(ret == -1){

1633

perror("ioctl SIOCSIFFLAGS");

1634

}

1635

}

1636

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

1637

if(ret == -1){

1638

perror("close");

1639

}

1640

/* Lower privileges permanently */

1641

errno = 0;

1642

ret = setuid(uid);

1643

if(ret == -1){

1644

perror("setuid");

1645

}

1646

}

1647

}

1648

1649

1302

/* Removes the temp directory used by GPGME */

1650

1303

if(tempdir_created){

1651

1304

DIR *d;

1690

1343

}

1691

1344

}

1692

1345

1693

if(quit_now){

1694

sigemptyset(&old_sigterm_action.sa_mask);

1695

old_sigterm_action.sa_handler = SIG_DFL;

1696

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1697

&old_sigterm_action,

1698

NULL));

1699

if(ret == -1){

1700

perror("sigaction");

1701

}

1702

do {

1703

ret = raise(signal_received);

1704

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

1705

if(ret != 0){

1706

perror("raise");

1707

abort();

1708

}

1709

TEMP_FAILURE_RETRY(pause());

1710

}

1711

1712

1346

return exitcode;

1713

1347

}