/mandos/trunk : revision 24.1.135

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

41

37

42

38

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

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

45

42

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

46

43

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

47

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

44

srand() */

48

45

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

49

46

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

50

47

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

59

56

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

60

57

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

61

58

*/

62

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

63

strtoimax() */

59

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

64

60

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

65

61

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

66

62

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

71

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

68

*/

73

69

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

74

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

75

setgid(), pause() */

70

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

71

setgid() */

76

72

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

77

73

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

78

74

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

79

75

argp_state, struct argp,

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

78

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

86

79

#ifdef __linux__

87

80

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

88

#endif /* __linux__ */

81

#endif

89

82

90

83

/* Avahi */

91

84

/* All Avahi types, constants and functions

142

135

.dh_bits = 1024, .priority = "SECURE256"

143

136

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

144

137

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

147

148

138

/*

149

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

150

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

151

* "buffer_length" is how much is already used.

139

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

140

* additional bytes. "buffer_capacity" is how much is currently

141

* allocated, "buffer_length" is how much is already used.

152

142

*/

153

143

size_t incbuffer(char **buffer, size_t buffer_length,

154

144

size_t buffer_capacity){

167

157

*/

168

158

static bool init_gpgme(const char *seckey,

169

159

const char *pubkey, const char *tempdir){

160

int ret;

170

161

gpgme_error_t rc;

171

162

gpgme_engine_info_t engine_info;

172

163

175

166

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

176

167

*/

177

168

bool import_key(const char *filename){

178

int ret;

179

169

int fd;

180

170

gpgme_data_t pgp_data;

181

171

208

198

}

209

199

210

200

if(debug){

211

fprintf(stderr, "Initializing GPGME\n");

201

fprintf(stderr, "Initialize gpgme\n");

212

202

}

213

203

214

204

/* Init GPGME */

252

242

return false;

253

243

}

254

244

255

return true;

245

return true;

256

246

}

257

247

258

248

/*

312

302

}

313

303

gpgme_recipient_t recipient;

314

304

recipient = result->recipients;

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;

305

if(recipient){

306

while(recipient != NULL){

307

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

308

gpgme_pubkey_algo_name(recipient->pubkey_algo));

309

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

310

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

311

recipient->status == GPG_ERR_NO_SECKEY

312

? "No" : "Yes");

313

recipient = recipient->next;

314

}

323

315

}

324

316

}

325

317

}

477

469

static int init_gnutls_session(gnutls_session_t *session){

478

470

int ret;

479

471

/* GnuTLS session creation */

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);

472

ret = gnutls_init(session, GNUTLS_SERVER);

486

473

if(ret != GNUTLS_E_SUCCESS){

487

474

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

488

475

safer_gnutls_strerror(ret));

490

477

491

478

{

492

479

const char *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);

480

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

500

481

if(ret != GNUTLS_E_SUCCESS){

501

482

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

502

483

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

506

487

}

507

488

}

508

489

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);

490

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

491

mc.cred);

517

492

if(ret != GNUTLS_E_SUCCESS){

518

493

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

519

494

safer_gnutls_strerror(ret));

522

497

}

523

498

524

499

/* ignore client certificate if any. */

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

500

gnutls_certificate_server_set_request(*session,

501

GNUTLS_CERT_IGNORE);

526

502

527

503

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

528

504

537

513

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

538

514

AvahiIfIndex if_index,

539

515

int af){

540

int ret, tcp_sd = -1;

516

int ret, tcp_sd;

541

517

ssize_t sret;

542

518

union {

543

519

struct sockaddr_in in;

544

520

struct sockaddr_in6 in6;

545

521

} to;

546

522

char *buffer = NULL;

547

char *decrypted_buffer = NULL;

523

char *decrypted_buffer;

548

524

size_t buffer_length = 0;

549

525

size_t buffer_capacity = 0;

526

ssize_t decrypted_buffer_size;

550

527

size_t written;

551

int retval = -1;

528

int retval = 0;

552

529

gnutls_session_t session;

553

530

int pf; /* Protocol family */

554

531

555

if(quit_now){

556

return -1;

557

}

558

559

532

switch(af){

560

533

case AF_INET6:

561

534

pf = PF_INET6;

581

554

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

555

if(tcp_sd < 0){

583

556

perror("socket");

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

557

return -1;

589

558

}

590

559

591

560

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

592

561

if(af == AF_INET6){

593

to.in6.sin6_family = (sa_family_t)af;

562

to.in6.sin6_family = (uint16_t)af;

594

563

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

595

564

} else { /* IPv4 */

596

565

to.in.sin_family = (sa_family_t)af;

598

567

}

599

568

if(ret < 0 ){

600

569

perror("inet_pton");

601

goto mandos_end;

570

return -1;

602

571

}

603

572

if(ret == 0){

604

573

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

605

goto mandos_end;

574

return -1;

606

575

}

607

576

if(af == AF_INET6){

608

577

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

615

584

if(if_index == AVAHI_IF_UNSPEC){

616

585

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

617

586

" without a network interface\n");

618

goto mandos_end;

587

return -1;

619

588

}

620

589

/* Set the network interface number as scope */

621

590

to.in6.sin6_scope_id = (uint32_t)if_index;

626

595

-Wunreachable-code */

627

596

}

628

597

629

if(quit_now){

630

goto mandos_end;

631

}

632

633

598

if(debug){

634

599

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

635

600

char interface[IF_NAMESIZE];

662

627

}

663

628

}

664

629

665

if(quit_now){

666

goto mandos_end;

667

}

668

669

630

if(af == AF_INET6){

670

631

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

671

632

} else {

673

634

}

674

635

if(ret < 0){

675

636

perror("connect");

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

637

return -1;

681

638

}

682

639

683

640

const char *out = mandos_protocol_version;

688

645

out_size - written));

689

646

if(ret == -1){

690

647

perror("write");

648

retval = -1;

691

649

goto mandos_end;

692

650

}

693

651

written += (size_t)ret;

701

659

break;

702

660

}

703

661

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

662

}

709

663

710

664

if(debug){

711

665

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

712

666

}

713

667

714

if(quit_now){

715

goto mandos_end;

716

}

717

718

668

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

669

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

670

do{

725

671

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

729

672

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

730

673

731

674

if(ret != GNUTLS_E_SUCCESS){

733

676

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

734

677

gnutls_perror(ret);

735

678

}

679

retval = -1;

736

680

goto mandos_end;

737

681

}

738

682

744

688

}

745

689

746

690

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

752

691

buffer_capacity = incbuffer(&buffer, buffer_length,

753

692

buffer_capacity);

754

693

if(buffer_capacity == 0){

755

694

perror("incbuffer");

756

goto mandos_end;

757

}

758

759

if(quit_now){

695

retval = -1;

760

696

goto mandos_end;

761

697

}

762

698

771

707

case GNUTLS_E_AGAIN:

772

708

break;

773

709

case GNUTLS_E_REHANDSHAKE:

774

do {

710

do{

775

711

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

780

712

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

781

713

if(ret < 0){

782

714

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

783

715

gnutls_perror(ret);

716

retval = -1;

784

717

goto mandos_end;

785

718

}

786

719

break;

787

720

default:

788

721

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

789

722

" encrypted session with Mandos server\n");

723

retval = -1;

790

724

gnutls_bye(session, GNUTLS_SHUT_RDWR);

791

725

goto mandos_end;

792

726

}

799

733

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

800

734

}

801

735

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);

736

gnutls_bye(session, GNUTLS_SHUT_RDWR);

812

737

813

738

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

815

739

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

740

buffer_length,

817

741

&decrypted_buffer);

818

742

if(decrypted_buffer_size >= 0){

819

820

743

written = 0;

821

744

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

826

745

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

827

746

(size_t)decrypted_buffer_size - written,

828

747

stdout);

831

750

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

832

751

strerror(errno));

833

752

}

834

goto mandos_end;

753

retval = -1;

754

break;

835

755

}

836

756

written += (size_t)ret;

837

757

}

838

retval = 0;

758

free(decrypted_buffer);

759

} else {

760

retval = -1;

839

761

}

762

} else {

763

retval = -1;

840

764

}

841

765

842

766

/* Shutdown procedure */

843

767

844

768

mandos_end:

845

free(decrypted_buffer);

846

769

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

770

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

850

771

if(ret == -1){

851

772

perror("close");

852

773

}

853

774

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

857

775

return retval;

858

776

}

859

777

870

788

AVAHI_GCC_UNUSED AvahiStringList *txt,

871

789

AVAHI_GCC_UNUSED AvahiLookupResultFlags

872

790

flags,

873

AVAHI_GCC_UNUSED void* userdata){

791

__attribute__((unused)) void* userdata){

874

792

assert(r);

875

793

876

794

/* Called whenever a service has been resolved successfully or

877

795

timed out */

878

796

879

if(quit_now){

880

return;

881

}

882

883

797

switch(event){

884

798

default:

885

799

case AVAHI_RESOLVER_FAILURE:

916

830

const char *domain,

917

831

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

832

flags,

919

AVAHI_GCC_UNUSED void* userdata){

833

__attribute__((unused)) void* userdata){

920

834

assert(b);

921

835

922

836

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

923

837

is removed from the LAN */

924

838

925

if(quit_now){

926

return;

927

}

928

929

839

switch(event){

930

840

default:

931

841

case AVAHI_BROWSER_FAILURE:

941

851

the callback function is called the Avahi server will free the

942

852

resolver for us. */

943

853

944

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

945

name, type, domain, protocol, 0,

946

resolve_callback, NULL) == NULL)

854

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

855

protocol, name, type, domain,

856

AVAHI_PROTO_INET6, 0,

857

resolve_callback, NULL)))

947

858

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

948

859

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

949

860

break;

961

872

}

962

873

963

874

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

964

static void handle_sigterm(int sig){

965

if(quit_now){

966

return;

967

}

968

quit_now = 1;

969

signal_received = sig;

875

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

970

876

int old_errno = errno;

971

if(mc.simple_poll != NULL){

972

avahi_simple_poll_quit(mc.simple_poll);

973

}

877

avahi_simple_poll_quit(mc.simple_poll);

974

878

errno = old_errno;

975

879

}

976

880

979

883

int error;

980

884

int ret;

981

885

intmax_t tmpmax;

982

char *tmp;

886

int numchars;

983

887

int exitcode = EXIT_SUCCESS;

984

888

const char *interface = "eth0";

985

889

struct ifreq network;

986

int sd = -1;

987

bool take_down_interface = false;

890

int sd;

988

891

uid_t uid;

989

892

gid_t gid;

990

893

char *connect_to = NULL;

996

899

997

900

bool gnutls_initialized = false;

998

901

bool gpgme_initialized = false;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

902

double delay = 2.5;

903

904

struct sigaction old_sigterm_action;

1002

905

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

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

906

1025

907

{

1026

908

struct argp_option options[] = {

1027

909

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

1078

960

pubkey = arg;

1079

961

break;

1080

962

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

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){

963

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

964

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

965

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

1085

966

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

1086

967

exit(EXIT_FAILURE);

1087

968

}

1091

972

mc.priority = arg;

1092

973

break;

1093

974

case 131: /* --delay */

1094

errno = 0;

1095

delay = strtof(arg, &tmp);

1096

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

975

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

976

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

1097

977

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

1098

978

exit(EXIT_FAILURE);

1099

979

}

1119

999

goto end;

1120

1000

}

1121

1001

}

1122

1002

1123

1003

if(not debug){

1124

1004

avahi_set_log_function(empty_log);

1125

1005

}

1126

1006

1127

1007

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

1128

1008

from the signal handler */

1129

1009

/* Initialize the pseudo-RNG for Avahi */

1134

1014

exitcode = EXIT_FAILURE;

1135

1015

goto end;

1136

1016

}

1137

1017

1138

1018

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

1019

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

1152

1020

if(ret == -1){

1153

1021

perror("sigaddset");

1154

1022

exitcode = EXIT_FAILURE;

1155

1023

goto end;

1156

1024

}

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

}

1025

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

1026

if(ret == -1){

1027

perror("sigaction");

1028

exitcode = EXIT_FAILURE;

1029

goto end;

1030

}

1031

1200

1032

1201

1033

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

1202

1034

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

1221

1035

#ifdef __linux__

1222

1036

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

1037

messages to mess up the prompt */

1227

1041

restore_loglevel = false;

1228

1042

perror("klogctl");

1229

1043

}

1230

#endif /* __linux__ */

1044

#endif

1231

1045

1232

1046

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1047

if(sd < 0){

1240

1054

perror("klogctl");

1241

1055

}

1242

1056

}

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1057

#endif

1250

1058

goto end;

1251

1059

}

1252

1060

strcpy(network.ifr_name, interface);

1260

1068

perror("klogctl");

1261

1069

}

1262

1070

}

1263

#endif /* __linux__ */

1071

#endif

1264

1072

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1271

1073

goto end;

1272

1074

}

1273

1075

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

1274

1076

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1276

1077

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

1277

1078

if(ret == -1){

1278

take_down_interface = false;

1279

1079

perror("ioctl SIOCSIFFLAGS");

1280

1080

exitcode = EXIT_FAILURE;

1281

1081

#ifdef __linux__

1285

1085

perror("klogctl");

1286

1086

}

1287

1087

}

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1088

#endif

1295

1089

goto end;

1296

1090

}

1297

1091

}

1309

1103

perror("nanosleep");

1310

1104

}

1311

1105

}

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

}

1106

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

1107

if(ret == -1){

1108

perror("close");

1318

1109

}

1319

1110

#ifdef __linux__

1320

1111

if(restore_loglevel){

1324

1115

perror("klogctl");

1325

1116

}

1326

1117

}

1327

#endif /* __linux__ */

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;

1118

#endif

1119

}

1120

1121

uid = getuid();

1122

gid = getgid();

1123

1124

errno = 0;

1125

setgid(gid);

1126

if(ret == -1){

1127

perror("setgid");

1128

}

1129

1130

ret = setuid(uid);

1131

if(ret == -1){

1132

perror("setuid");

1347

1133

}

1348

1134

1349

1135

ret = init_gnutls_global(pubkey, seckey);

1355

1141

gnutls_initialized = true;

1356

1142

}

1357

1143

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1363

1144

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

1145

perror("mkdtemp");

1366

1146

goto end;

1367

1147

}

1368

1369

if(quit_now){

1370

goto end;

1371

}

1148

tempdir_created = true;

1372

1149

1373

1150

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

1374

1151

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

1378

1155

gpgme_initialized = true;

1379

1156

}

1380

1157

1381

if(quit_now){

1382

goto end;

1158

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

1159

if_index = (AvahiIfIndex) if_nametoindex(interface);

1160

if(if_index == 0){

1161

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

1162

exitcode = EXIT_FAILURE;

1163

goto end;

1164

}

1383

1165

}

1384

1166

1385

1167

if(connect_to != NULL){

1391

1173

exitcode = EXIT_FAILURE;

1392

1174

goto end;

1393

1175

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1399

1176

uint16_t port;

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){

1177

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

1178

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

1179

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

1404

1180

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

1405

1181

exitcode = EXIT_FAILURE;

1406

1182

goto end;

1407

1183

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1413

1184

port = (uint16_t)tmpmax;

1414

1185

*address = '\0';

1415

1186

address = connect_to;

1420

1191

} else {

1421

1192

af = AF_INET;

1422

1193

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1428

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

1194

ret = start_mandos_communication(address, port, if_index,

1195

af);

1429

1196

if(ret < 0){

1430

1197

exitcode = EXIT_FAILURE;

1431

1198

} else {

1433

1200

}

1434

1201

goto end;

1435

1202

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1203

1441

1204

{

1442

1205

AvahiServerConfig config;

1443

1206

/* Do not publish any local Zeroconf records */

1464

1227

goto end;

1465

1228

}

1466

1229

1467

if(quit_now){

1468

goto end;

1469

}

1470

1471

1230

/* Create the Avahi service browser */

1472

1231

sb = avahi_s_service_browser_new(mc.server, if_index,

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1232

AVAHI_PROTO_INET6, "_mandos._tcp",

1474

1233

NULL, 0, browse_callback, NULL);

1475

1234

if(sb == NULL){

1476

1235

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

1479

1238

goto end;

1480

1239

}

1481

1240

1482

if(quit_now){

1483

goto end;

1484

}

1485

1486

1241

/* Run the main loop */

1487

1242

1488

1243

if(debug){

1517

1272

gpgme_release(mc.ctx);

1518

1273

}

1519

1274

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

1552

1275

/* Removes the temp directory used by GPGME */

1553

1276

if(tempdir_created){

1554

1277

DIR *d;

1593

1316

}

1594

1317

}

1595

1318

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

1615

1319

return exitcode;

1616

1320

}