/mandos/trunk : revision 392

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

37

41

38

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

#include <stdint.h> /* uint16_t, uint32_t */

42

45

#include <stddef.h> /* NULL, size_t, ssize_t */

43

46

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

44

srand() */

47

srand(), strtof(), abort() */

45

48

#include <stdbool.h> /* bool, false, true */

46

49

#include <string.h> /* memset(), strcmp(), strlen(),

47

50

strerror(), asprintf(), strcpy() */

56

59

#include <fcntl.h> /* open() */

57

60

#include <dirent.h> /* opendir(), struct dirent, readdir()

58

61

*/

59

#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

60

64

#include <assert.h> /* assert() */

61

65

#include <errno.h> /* perror(), errno */

62

66

#include <time.h> /* nanosleep(), time() */

67

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

72

*/

69

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

70

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

71

setgid() */

74

getuid(), getgid(), seteuid(),

75

setgid(), pause() */

72

76

#include <arpa/inet.h> /* inet_pton(), htons */

73

77

#include <iso646.h> /* not, or, and */

74

78

#include <argp.h> /* struct argp_option, error_t, struct

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

82

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

81

85

82

86

#ifdef __linux__

83

87

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

134

138

} mandos_context;

135

139

136

140

/* global context so signal handler can reach it*/

137

mandos_context mc;

141

mandos_context mc = { .simple_poll = NULL, .server = NULL,

142

.dh_bits = 1024, .priority = "SECURE256"

143

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

144

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

138

147

139

148

/*

140

149

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

158

167

*/

159

168

static bool init_gpgme(const char *seckey,

160

169

const char *pubkey, const char *tempdir){

161

int ret;

162

170

gpgme_error_t rc;

163

171

gpgme_engine_info_t engine_info;

164

172

167

175

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

168

176

*/

169

177

bool import_key(const char *filename){

178

int ret;

170

179

int fd;

171

180

gpgme_data_t pgp_data;

172

181

243

252

return false;

244

253

}

245

254

246

return true;

255

return true;

247

256

}

248

257

249

258

/*

303

312

}

304

313

gpgme_recipient_t recipient;

305

314

recipient = result->recipients;

306

if(recipient){

307

while(recipient != NULL){

308

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

309

gpgme_pubkey_algo_name(recipient->pubkey_algo));

310

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

311

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

312

recipient->status == GPG_ERR_NO_SECKEY

313

? "No" : "Yes");

314

recipient = recipient->next;

315

}

315

while(recipient != NULL){

316

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

317

gpgme_pubkey_algo_name(recipient->pubkey_algo));

318

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

319

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

320

recipient->status == GPG_ERR_NO_SECKEY

321

? "No" : "Yes");

322

recipient = recipient->next;

316

323

}

317

324

}

318

325

}

470

477

static int init_gnutls_session(gnutls_session_t *session){

471

478

int ret;

472

479

/* GnuTLS session creation */

473

ret = gnutls_init(session, GNUTLS_SERVER);

480

do {

481

ret = gnutls_init(session, GNUTLS_SERVER);

482

if(quit_now){

483

return -1;

484

}

485

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

474

486

if(ret != GNUTLS_E_SUCCESS){

475

487

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

476

488

safer_gnutls_strerror(ret));

478

490

479

491

{

480

492

const char *err;

481

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

493

do {

494

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

495

if(quit_now){

496

gnutls_deinit(*session);

497

return -1;

498

}

499

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

482

500

if(ret != GNUTLS_E_SUCCESS){

483

501

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

484

502

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

488

506

}

489

507

}

490

508

491

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

492

mc.cred);

509

do {

510

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

511

mc.cred);

512

if(quit_now){

513

gnutls_deinit(*session);

514

return -1;

515

}

516

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

493

517

if(ret != GNUTLS_E_SUCCESS){

494

518

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

495

519

safer_gnutls_strerror(ret));

498

522

}

499

523

500

524

/* ignore client certificate if any. */

501

gnutls_certificate_server_set_request(*session,

502

GNUTLS_CERT_IGNORE);

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

526

504

527

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

505

528

514

537

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

515

538

AvahiIfIndex if_index,

516

539

int af){

517

int ret, tcp_sd;

540

int ret, tcp_sd = -1;

518

541

ssize_t sret;

519

542

union {

520

543

struct sockaddr_in in;

521

544

struct sockaddr_in6 in6;

522

545

} to;

523

546

char *buffer = NULL;

524

char *decrypted_buffer;

547

char *decrypted_buffer = NULL;

525

548

size_t buffer_length = 0;

526

549

size_t buffer_capacity = 0;

527

ssize_t decrypted_buffer_size;

528

550

size_t written;

529

int retval = 0;

551

int retval = -1;

530

552

gnutls_session_t session;

531

553

int pf; /* Protocol family */

532

554

555

if(quit_now){

556

return -1;

557

}

558

533

559

switch(af){

534

560

case AF_INET6:

535

561

pf = PF_INET6;

555

581

tcp_sd = socket(pf, SOCK_STREAM, 0);

556

582

if(tcp_sd < 0){

557

583

perror("socket");

558

return -1;

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

559

589

}

560

590

561

591

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

562

592

if(af == AF_INET6){

563

to.in6.sin6_family = (uint16_t)af;

593

to.in6.sin6_family = (sa_family_t)af;

564

594

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

565

595

} else { /* IPv4 */

566

596

to.in.sin_family = (sa_family_t)af;

568

598

}

569

599

if(ret < 0 ){

570

600

perror("inet_pton");

571

return -1;

601

goto mandos_end;

572

602

}

573

603

if(ret == 0){

574

604

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

575

return -1;

605

goto mandos_end;

576

606

}

577

607

if(af == AF_INET6){

578

608

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

585

615

if(if_index == AVAHI_IF_UNSPEC){

586

616

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

587

617

" without a network interface\n");

588

return -1;

618

goto mandos_end;

589

619

}

590

620

/* Set the network interface number as scope */

591

621

to.in6.sin6_scope_id = (uint32_t)if_index;

596

626

-Wunreachable-code */

597

627

}

598

628

629

if(quit_now){

630

goto mandos_end;

631

}

632

599

633

if(debug){

600

634

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

601

635

char interface[IF_NAMESIZE];

628

662

}

629

663

}

630

664

665

if(quit_now){

666

goto mandos_end;

667

}

668

631

669

if(af == AF_INET6){

632

670

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

633

671

} else {

635

673

}

636

674

if(ret < 0){

637

675

perror("connect");

638

return -1;

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

639

681

}

640

682

641

683

const char *out = mandos_protocol_version;

646

688

out_size - written));

647

689

if(ret == -1){

648

690

perror("write");

649

retval = -1;

650

691

goto mandos_end;

651

692

}

652

693

written += (size_t)ret;

660

701

break;

661

702

}

662

703

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

663

708

}

664

709

665

710

if(debug){

666

711

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

667

712

}

668

713

714

if(quit_now){

715

goto mandos_end;

716

}

717

669

718

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

670

719

671

do{

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

672

725

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

673

729

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

674

730

675

731

if(ret != GNUTLS_E_SUCCESS){

677

733

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

678

734

gnutls_perror(ret);

679

735

}

680

retval = -1;

681

736

goto mandos_end;

682

737

}

683

738

689

744

}

690

745

691

746

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

692

752

buffer_capacity = incbuffer(&buffer, buffer_length,

693

753

buffer_capacity);

694

754

if(buffer_capacity == 0){

695

755

perror("incbuffer");

696

retval = -1;

756

goto mandos_end;

757

}

758

759

if(quit_now){

697

760

goto mandos_end;

698

761

}

699

762

708

771

case GNUTLS_E_AGAIN:

709

772

break;

710

773

case GNUTLS_E_REHANDSHAKE:

711

do{

774

do {

712

775

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

713

780

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

714

781

if(ret < 0){

715

782

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

716

783

gnutls_perror(ret);

717

retval = -1;

718

784

goto mandos_end;

719

785

}

720

786

break;

721

787

default:

722

788

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

723

789

" encrypted session with Mandos server\n");

724

retval = -1;

725

790

gnutls_bye(session, GNUTLS_SHUT_RDWR);

726

791

goto mandos_end;

727

792

}

734

799

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

735

800

}

736

801

737

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

if(quit_now){

803

goto mandos_end;

804

}

805

806

do {

807

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

if(quit_now){

809

goto mandos_end;

810

}

811

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

738

812

739

813

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

740

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

741

816

buffer_length,

742

817

&decrypted_buffer);

743

818

if(decrypted_buffer_size >= 0){

819

744

820

written = 0;

745

821

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

746

826

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

747

827

(size_t)decrypted_buffer_size - written,

748

828

stdout);

751

831

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

752

832

strerror(errno));

753

833

}

754

retval = -1;

755

break;

834

goto mandos_end;

756

835

}

757

836

written += (size_t)ret;

758

837

}

759

free(decrypted_buffer);

760

} else {

761

retval = -1;

838

retval = 0;

762

839

}

763

} else {

764

retval = -1;

765

840

}

766

841

767

842

/* Shutdown procedure */

768

843

769

844

mandos_end:

845

free(decrypted_buffer);

770

846

free(buffer);

771

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

847

if(tcp_sd >= 0){

848

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

849

}

772

850

if(ret == -1){

773

851

perror("close");

774

852

}

775

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

776

857

return retval;

777

858

}

778

859

795

876

/* Called whenever a service has been resolved successfully or

796

877

timed out */

797

878

879

if(quit_now){

880

return;

881

}

882

798

883

switch(event){

799

884

default:

800

885

case AVAHI_RESOLVER_FAILURE:

837

922

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

838

923

is removed from the LAN */

839

924

925

if(quit_now){

926

return;

927

}

928

840

929

switch(event){

841

930

default:

842

931

case AVAHI_BROWSER_FAILURE:

852

941

the callback function is called the Avahi server will free the

853

942

resolver for us. */

854

943

855

if(!(avahi_s_service_resolver_new(mc.server, interface,

856

protocol, name, type, domain,

857

AVAHI_PROTO_INET6, 0,

858

resolve_callback, NULL)))

944

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

945

name, type, domain, protocol, 0,

946

resolve_callback, NULL) == NULL)

859

947

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

860

948

name, avahi_strerror(avahi_server_errno(mc.server)));

861

949

break;

872

960

}

873

961

}

874

962

875

sig_atomic_t quit_now = 0;

876

877

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

963

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

964

static void handle_sigterm(int sig){

878

965

if(quit_now){

879

966

return;

880

967

}

881

968

quit_now = 1;

969

signal_received = sig;

882

970

int old_errno = errno;

883

971

if(mc.simple_poll != NULL){

884

972

avahi_simple_poll_quit(mc.simple_poll);

891

979

int error;

892

980

int ret;

893

981

intmax_t tmpmax;

894

int numchars;

982

char *tmp;

895

983

int exitcode = EXIT_SUCCESS;

896

984

const char *interface = "eth0";

897

985

struct ifreq network;

898

int sd;

986

int sd = -1;

987

bool take_down_interface = false;

899

988

uid_t uid;

900

989

gid_t gid;

901

990

char *connect_to = NULL;

905

994

const char *seckey = PATHDIR "/" SECKEY;

906

995

const char *pubkey = PATHDIR "/" PUBKEY;

907

996

908

/* Initialize Mandos context */

909

mc = (mandos_context){ .simple_poll = NULL, .server = NULL,

910

.dh_bits = 1024, .priority = "SECURE256"

911

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

912

997

bool gnutls_initialized = false;

913

998

bool gpgme_initialized = false;

914

double delay = 2.5;

915

916

struct sigaction old_sigterm_action;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

1002

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

918

1003

1004

uid = getuid();

1005

gid = getgid();

1006

1007

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

1008

errno = 0;

1009

ret = setgid(gid);

1010

if(ret == -1){

1011

perror("setgid");

1012

}

1013

1014

/* Lower user privileges (temporarily) */

1015

errno = 0;

1016

ret = seteuid(uid);

1017

if(ret == -1){

1018

perror("seteuid");

1019

}

1020

1021

if(quit_now){

1022

goto end;

1023

}

1024

919

1025

{

920

1026

struct argp_option options[] = {

921

1027

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

972

1078

pubkey = arg;

973

1079

break;

974

1080

case 129: /* --dh-bits */

975

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

976

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

977

or arg[numchars] != '\0'){

1081

errno = 0;

1082

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

1083

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

1084

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

978

1085

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

979

1086

exit(EXIT_FAILURE);

980

1087

}

984

1091

mc.priority = arg;

985

1092

break;

986

1093

case 131: /* --delay */

987

ret = sscanf(arg, "%lf%n", &delay, &numchars);

988

if(ret < 1 or arg[numchars] != '\0'){

1094

errno = 0;

1095

delay = strtof(arg, &tmp);

1096

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

989

1097

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

990

1098

exit(EXIT_FAILURE);

991

1099

}

1012

1120

}

1013

1121

}

1014

1122

1123

if(not debug){

1124

avahi_set_log_function(empty_log);

1125

}

1126

1127

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

1128

from the signal handler */

1129

/* Initialize the pseudo-RNG for Avahi */

1130

srand((unsigned int) time(NULL));

1131

mc.simple_poll = avahi_simple_poll_new();

1132

if(mc.simple_poll == NULL){

1133

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

1134

exitcode = EXIT_FAILURE;

1135

goto end;

1136

}

1137

1138

sigemptyset(&sigterm_action.sa_mask);

1139

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

1140

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1143

goto end;

1144

}

1145

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

1146

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1149

goto end;

1150

}

1151

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

1152

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1155

goto end;

1156

}

1157

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

1158

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

1159

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

1160

*/

1161

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

1162

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1165

}

1166

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

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

1168

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1171

goto end;

1172

}

1173

}

1174

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

1175

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1178

}

1179

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

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

1181

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1184

goto end;

1185

}

1186

}

1187

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

1188

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1191

}

1192

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

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

1194

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

1199

}

1200

1015

1201

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

1016

1202

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

1203

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

if(if_index == 0){

1205

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

1206

exitcode = EXIT_FAILURE;

1207

goto end;

1208

}

1209

1210

if(quit_now){

1211

goto end;

1212

}

1213

1214

/* Re-raise priviliges */

1215

errno = 0;

1216

ret = seteuid(0);

1217

if(ret == -1){

1218

perror("seteuid");

1219

}

1220

1017

1221

#ifdef __linux__

1018

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1019

1223

messages to mess up the prompt */

1037

1241

}

1038

1242

}

1039

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1040

1250

goto end;

1041

1251

}

1042

1252

strcpy(network.ifr_name, interface);

1052

1262

}

1053

1263

#endif /* __linux__ */

1054

1264

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1055

1271

goto end;

1056

1272

}

1057

1273

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

1058

1274

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1059

1276

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

1060

1277

if(ret == -1){

1278

take_down_interface = false;

1061

1279

perror("ioctl SIOCSIFFLAGS");

1062

1280

exitcode = EXIT_FAILURE;

1063

1281

#ifdef __linux__

1068

1286

}

1069

1287

}

1070

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1071

1295

goto end;

1072

1296

}

1073

1297

}

1085

1309

perror("nanosleep");

1086

1310

}

1087

1311

}

1088

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

1089

if(ret == -1){

1090

perror("close");

1312

if(not take_down_interface){

1313

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

1314

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

1315

if(ret == -1){

1316

perror("close");

1317

}

1091

1318

}

1092

1319

#ifdef __linux__

1093

1320

if(restore_loglevel){

1098

1325

}

1099

1326

}

1100

1327

#endif /* __linux__ */

1101

}

1102

1103

uid = getuid();

1104

gid = getgid();

1105

1106

errno = 0;

1107

setgid(gid);

1108

if(ret == -1){

1109

perror("setgid");

1110

}

1111

1112

ret = setuid(uid);

1113

if(ret == -1){

1114

perror("setuid");

1328

/* Lower privileges */

1329

errno = 0;

1330

if(take_down_interface){

1331

/* Lower privileges */

1332

ret = seteuid(uid);

1333

if(ret == -1){

1334

perror("seteuid");

1335

}

1336

} else {

1337

/* Lower privileges permanently */

1338

ret = setuid(uid);

1339

if(ret == -1){

1340

perror("setuid");

1341

}

1342

}

1343

}

1344

1345

if(quit_now){

1346

goto end;

1115

1347

}

1116

1348

1117

1349

ret = init_gnutls_global(pubkey, seckey);

1123

1355

gnutls_initialized = true;

1124

1356

}

1125

1357

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1126

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1127

1365

perror("mkdtemp");

1128

1366

goto end;

1129

1367

}

1130

tempdir_created = true;

1368

1369

if(quit_now){

1370

goto end;

1371

}

1131

1372

1132

1373

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

1133

1374

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

1137

1378

gpgme_initialized = true;

1138

1379

}

1139

1380

1140

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

1141

if_index = (AvahiIfIndex) if_nametoindex(interface);

1142

if(if_index == 0){

1143

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

1144

exitcode = EXIT_FAILURE;

1145

goto end;

1146

}

1381

if(quit_now){

1382

goto end;

1147

1383

}

1148

1384

1149

1385

if(connect_to != NULL){

1155

1391

exitcode = EXIT_FAILURE;

1156

1392

goto end;

1157

1393

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1158

1399

uint16_t port;

1159

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1160

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1161

or address[numchars+1] != '\0'){

1400

errno = 0;

1401

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

1402

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

1403

or tmpmax != (uint16_t)tmpmax){

1162

1404

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

1163

1405

exitcode = EXIT_FAILURE;

1164

1406

goto end;

1165

1407

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1166

1413

port = (uint16_t)tmpmax;

1167

1414

*address = '\0';

1168

1415

address = connect_to;

1173

1420

} else {

1174

1421

af = AF_INET;

1175

1422

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1176

1428

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

1177

1429

if(ret < 0){

1178

1430

exitcode = EXIT_FAILURE;

1182

1434

goto end;

1183

1435

}

1184

1436

1185

if(not debug){

1186

avahi_set_log_function(empty_log);

1187

}

1188

1189

/* Initialize the pseudo-RNG for Avahi */

1190

srand((unsigned int) time(NULL));

1191

1192

/* Allocate main Avahi loop object */

1193

mc.simple_poll = avahi_simple_poll_new();

1194

if(mc.simple_poll == NULL){

1195

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

1196

exitcode = EXIT_FAILURE;

1437

if(quit_now){

1197

1438

goto end;

1198

1439

}

1199

1440

1223

1464

goto end;

1224

1465

}

1225

1466

1467

if(quit_now){

1468

goto end;

1469

}

1470

1226

1471

/* Create the Avahi service browser */

1227

1472

sb = avahi_s_service_browser_new(mc.server, if_index,

1228

AVAHI_PROTO_INET6, "_mandos._tcp",

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1229

1474

NULL, 0, browse_callback, NULL);

1230

1475

if(sb == NULL){

1231

1476

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

1234

1479

goto end;

1235

1480

}

1236

1481

1237

sigemptyset(&sigterm_action.sa_mask);

1238

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

1239

if(ret == -1){

1240

perror("sigaddset");

1241

exitcode = EXIT_FAILURE;

1242

goto end;

1243

}

1244

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

1245

if(ret == -1){

1246

perror("sigaddset");

1247

exitcode = EXIT_FAILURE;

1248

goto end;

1249

}

1250

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

1251

if(ret == -1){

1252

perror("sigaddset");

1253

exitcode = EXIT_FAILURE;

1254

goto end;

1255

}

1256

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

1257

if(ret == -1){

1258

perror("sigaction");

1259

exitcode = EXIT_FAILURE;

1260

goto end;

1261

}

1482

if(quit_now){

1483

goto end;

1484

}

1262

1485

1263

1486

/* Run the main loop */

1264

1487

1294

1517

gpgme_release(mc.ctx);

1295

1518

}

1296

1519

1520

/* Take down the network interface */

1521

if(take_down_interface){

1522

/* Re-raise priviliges */

1523

errno = 0;

1524

ret = seteuid(0);

1525

if(ret == -1){

1526

perror("seteuid");

1527

}

1528

if(geteuid() == 0){

1529

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

1530

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

1532

} else if(network.ifr_flags & IFF_UP) {

1533

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

1534

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

1535

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

1537

}

1538

}

1539

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

1540

if(ret == -1){

1541

perror("close");

1542

}

1543

/* Lower privileges permanently */

1544

errno = 0;

1545

ret = setuid(uid);

1546

if(ret == -1){

1547

perror("setuid");

1548

}

1549

}

1550

}

1551

1297

1552

/* Removes the temp directory used by GPGME */

1298

1553

if(tempdir_created){

1299

1554

DIR *d;

1338

1593

}

1339

1594

}

1340

1595

1596

if(quit_now){

1597

sigemptyset(&old_sigterm_action.sa_mask);

1598

old_sigterm_action.sa_handler = SIG_DFL;

1599

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1600

&old_sigterm_action,

1601

NULL));

1602

if(ret == -1){

1603

perror("sigaction");

1604

}

1605

do {

1606

ret = raise(signal_received);

1607

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

1608

if(ret != 0){

1609

perror("raise");

1610

abort();

1611

}

1612

TEMP_FAILURE_RETRY(pause());

1613

}

1614

1341

1615

return exitcode;

1342

1616

}