/mandos/trunk : revision 24.1.145

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

75

79

argp_state, struct argp,

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

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

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

79

86

#ifdef __linux__

80

87

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

81

#endif

88

#endif /* __linux__ */

82

89

83

90

/* Avahi */

84

91

/* All Avahi types, constants and functions

135

142

.dh_bits = 1024, .priority = "SECURE256"

136

143

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

137

144

145

sig_atomic_t quit_now = 0;

146

int signal_received = 0;

147

138

148

/*

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.

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.

142

152

*/

143

153

size_t incbuffer(char **buffer, size_t buffer_length,

144

154

size_t buffer_capacity){

157

167

*/

158

168

static bool init_gpgme(const char *seckey,

159

169

const char *pubkey, const char *tempdir){

160

int ret;

161

170

gpgme_error_t rc;

162

171

gpgme_engine_info_t engine_info;

163

172

166

175

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

167

176

*/

168

177

bool import_key(const char *filename){

178

int ret;

169

179

int fd;

170

180

gpgme_data_t pgp_data;

171

181

198

208

}

199

209

200

210

if(debug){

201

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

211

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

202

212

}

203

213

204

214

/* Init GPGME */

242

252

return false;

243

253

}

244

254

245

return true;

255

return true;

246

256

}

247

257

248

258

/*

302

312

}

303

313

gpgme_recipient_t recipient;

304

314

recipient = result->recipients;

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

}

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;

315

323

}

316

324

}

317

325

}

469

477

static int init_gnutls_session(gnutls_session_t *session){

470

478

int ret;

471

479

/* GnuTLS session creation */

472

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);

473

486

if(ret != GNUTLS_E_SUCCESS){

474

487

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

475

488

safer_gnutls_strerror(ret));

477

490

478

491

{

479

492

const char *err;

480

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);

481

500

if(ret != GNUTLS_E_SUCCESS){

482

501

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

483

502

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

487

506

}

488

507

}

489

508

490

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

491

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);

492

517

if(ret != GNUTLS_E_SUCCESS){

493

518

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

494

519

safer_gnutls_strerror(ret));

497

522

}

498

523

499

524

/* ignore client certificate if any. */

500

gnutls_certificate_server_set_request(*session,

501

GNUTLS_CERT_IGNORE);

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

502

526

503

527

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

504

528

513

537

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

514

538

AvahiIfIndex if_index,

515

539

int af){

516

int ret, tcp_sd;

540

int ret, tcp_sd = -1;

517

541

ssize_t sret;

518

542

union {

519

543

struct sockaddr_in in;

520

544

struct sockaddr_in6 in6;

521

545

} to;

522

546

char *buffer = NULL;

523

char *decrypted_buffer;

547

char *decrypted_buffer = NULL;

524

548

size_t buffer_length = 0;

525

549

size_t buffer_capacity = 0;

526

ssize_t decrypted_buffer_size;

527

550

size_t written;

528

int retval = 0;

551

int retval = -1;

529

552

gnutls_session_t session;

530

553

int pf; /* Protocol family */

531

554

555

if(quit_now){

556

return -1;

557

}

558

532

559

switch(af){

533

560

case AF_INET6:

534

561

pf = PF_INET6;

554

581

tcp_sd = socket(pf, SOCK_STREAM, 0);

555

582

if(tcp_sd < 0){

556

583

perror("socket");

557

return -1;

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

558

589

}

559

590

560

591

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

561

592

if(af == AF_INET6){

562

to.in6.sin6_family = (uint16_t)af;

593

to.in6.sin6_family = (sa_family_t)af;

563

594

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

564

595

} else { /* IPv4 */

565

596

to.in.sin_family = (sa_family_t)af;

567

598

}

568

599

if(ret < 0 ){

569

600

perror("inet_pton");

570

return -1;

601

goto mandos_end;

571

602

}

572

603

if(ret == 0){

573

604

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

574

return -1;

605

goto mandos_end;

575

606

}

576

607

if(af == AF_INET6){

577

608

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

584

615

if(if_index == AVAHI_IF_UNSPEC){

585

616

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

586

617

" without a network interface\n");

587

return -1;

618

goto mandos_end;

588

619

}

589

620

/* Set the network interface number as scope */

590

621

to.in6.sin6_scope_id = (uint32_t)if_index;

595

626

-Wunreachable-code */

596

627

}

597

628

629

if(quit_now){

630

goto mandos_end;

631

}

632

598

633

if(debug){

599

634

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

600

635

char interface[IF_NAMESIZE];

627

662

}

628

663

}

629

664

665

if(quit_now){

666

goto mandos_end;

667

}

668

630

669

if(af == AF_INET6){

631

670

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

632

671

} else {

634

673

}

635

674

if(ret < 0){

636

675

perror("connect");

637

return -1;

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

638

681

}

639

682

640

683

const char *out = mandos_protocol_version;

645

688

out_size - written));

646

689

if(ret == -1){

647

690

perror("write");

648

retval = -1;

649

691

goto mandos_end;

650

692

}

651

693

written += (size_t)ret;

659

701

break;

660

702

}

661

703

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

662

708

}

663

709

664

710

if(debug){

665

711

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

666

712

}

667

713

714

if(quit_now){

715

goto mandos_end;

716

}

717

668

718

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

669

719

670

do{

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

671

725

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

672

729

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

673

730

674

731

if(ret != GNUTLS_E_SUCCESS){

676

733

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

677

734

gnutls_perror(ret);

678

735

}

679

retval = -1;

680

736

goto mandos_end;

681

737

}

682

738

688

744

}

689

745

690

746

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

691

752

buffer_capacity = incbuffer(&buffer, buffer_length,

692

753

buffer_capacity);

693

754

if(buffer_capacity == 0){

694

755

perror("incbuffer");

695

retval = -1;

756

goto mandos_end;

757

}

758

759

if(quit_now){

696

760

goto mandos_end;

697

761

}

698

762

707

771

case GNUTLS_E_AGAIN:

708

772

break;

709

773

case GNUTLS_E_REHANDSHAKE:

710

do{

774

do {

711

775

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

712

780

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

713

781

if(ret < 0){

714

782

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

715

783

gnutls_perror(ret);

716

retval = -1;

717

784

goto mandos_end;

718

785

}

719

786

break;

720

787

default:

721

788

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

722

789

" encrypted session with Mandos server\n");

723

retval = -1;

724

790

gnutls_bye(session, GNUTLS_SHUT_RDWR);

725

791

goto mandos_end;

726

792

}

733

799

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

734

800

}

735

801

736

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);

737

812

738

813

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

739

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

740

816

buffer_length,

741

817

&decrypted_buffer);

742

818

if(decrypted_buffer_size >= 0){

819

743

820

written = 0;

744

821

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

745

826

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

746

827

(size_t)decrypted_buffer_size - written,

747

828

stdout);

750

831

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

751

832

strerror(errno));

752

833

}

753

retval = -1;

754

break;

834

goto mandos_end;

755

835

}

756

836

written += (size_t)ret;

757

837

}

758

free(decrypted_buffer);

759

} else {

760

retval = -1;

838

retval = 0;

761

839

}

762

} else {

763

retval = -1;

764

840

}

765

841

766

842

/* Shutdown procedure */

767

843

768

844

mandos_end:

845

free(decrypted_buffer);

769

846

free(buffer);

770

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

847

if(tcp_sd >= 0){

848

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

849

}

771

850

if(ret == -1){

772

851

perror("close");

773

852

}

774

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

775

857

return retval;

776

858

}

777

859

788

870

AVAHI_GCC_UNUSED AvahiStringList *txt,

789

871

AVAHI_GCC_UNUSED AvahiLookupResultFlags

790

872

flags,

791

__attribute__((unused)) void* userdata){

873

AVAHI_GCC_UNUSED void* userdata){

792

874

assert(r);

793

875

794

876

/* Called whenever a service has been resolved successfully or

795

877

timed out */

796

878

879

if(quit_now){

880

return;

881

}

882

797

883

switch(event){

798

884

default:

799

885

case AVAHI_RESOLVER_FAILURE:

830

916

const char *domain,

831

917

AVAHI_GCC_UNUSED AvahiLookupResultFlags

832

918

flags,

833

__attribute__((unused)) void* userdata){

919

AVAHI_GCC_UNUSED void* userdata){

834

920

assert(b);

835

921

836

922

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

837

923

is removed from the LAN */

838

924

925

if(quit_now){

926

return;

927

}

928

839

929

switch(event){

840

930

default:

841

931

case AVAHI_BROWSER_FAILURE:

851

941

the callback function is called the Avahi server will free the

852

942

resolver for us. */

853

943

854

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

855

protocol, name, type, domain,

856

AVAHI_PROTO_INET6, 0,

857

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)

858

947

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

859

948

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

860

949

break;

872

961

}

873

962

874

963

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

875

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

964

static void handle_sigterm(int sig){

965

if(quit_now){

966

return;

967

}

968

quit_now = 1;

969

signal_received = sig;

876

970

int old_errno = errno;

877

avahi_simple_poll_quit(mc.simple_poll);

971

if(mc.simple_poll != NULL){

972

avahi_simple_poll_quit(mc.simple_poll);

973

}

878

974

errno = old_errno;

879

975

}

880

976

883

979

int error;

884

980

int ret;

885

981

intmax_t tmpmax;

886

int numchars;

982

char *tmp;

887

983

int exitcode = EXIT_SUCCESS;

888

984

const char *interface = "eth0";

889

985

struct ifreq network;

890

int sd;

986

int sd = -1;

987

bool take_down_interface = false;

891

988

uid_t uid;

892

989

gid_t gid;

893

990

char *connect_to = NULL;

899

996

900

997

bool gnutls_initialized = false;

901

998

bool gpgme_initialized = false;

902

double delay = 2.5;

903

904

struct sigaction old_sigterm_action;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

905

1002

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

906

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

907

1025

{

908

1026

struct argp_option options[] = {

909

1027

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

960

1078

pubkey = arg;

961

1079

break;

962

1080

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

963

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

964

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

965

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){

966

1085

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

967

1086

exit(EXIT_FAILURE);

968

1087

}

972

1091

mc.priority = arg;

973

1092

break;

974

1093

case 131: /* --delay */

975

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

976

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'){

977

1097

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

978

1098

exit(EXIT_FAILURE);

979

1099

}

999

1119

goto end;

1000

1120

}

1001

1121

}

1002

1122

1003

1123

if(not debug){

1004

1124

avahi_set_log_function(empty_log);

1005

1125

}

1006

1126

1007

1127

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

1008

1128

from the signal handler */

1009

1129

/* Initialize the pseudo-RNG for Avahi */

1014

1134

exitcode = EXIT_FAILURE;

1015

1135

goto end;

1016

1136

}

1017

1137

1018

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

}

1019

1151

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

1020

1152

if(ret == -1){

1021

1153

perror("sigaddset");

1022

1154

exitcode = EXIT_FAILURE;

1023

1155

goto end;

1024

1156

}

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

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

}

1032

1200

1033

1201

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

1034

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

1035

1221

#ifdef __linux__

1036

1222

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1037

1223

messages to mess up the prompt */

1041

1227

restore_loglevel = false;

1042

1228

perror("klogctl");

1043

1229

}

1044

#endif

1230

#endif /* __linux__ */

1045

1231

1046

1232

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1047

1233

if(sd < 0){

1054

1240

perror("klogctl");

1055

1241

}

1056

1242

}

1057

#endif

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1058

1250

goto end;

1059

1251

}

1060

1252

strcpy(network.ifr_name, interface);

1068

1260

perror("klogctl");

1069

1261

}

1070

1262

}

1071

#endif

1263

#endif /* __linux__ */

1072

1264

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1073

1271

goto end;

1074

1272

}

1075

1273

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

1076

1274

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1077

1276

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

1078

1277

if(ret == -1){

1278

take_down_interface = false;

1079

1279

perror("ioctl SIOCSIFFLAGS");

1080

1280

exitcode = EXIT_FAILURE;

1081

1281

#ifdef __linux__

1085

1285

perror("klogctl");

1086

1286

}

1087

1287

}

1088

#endif

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1089

1295

goto end;

1090

1296

}

1091

1297

}

1103

1309

perror("nanosleep");

1104

1310

}

1105

1311

}

1106

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

1107

if(ret == -1){

1108

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

}

1109

1318

}

1110

1319

#ifdef __linux__

1111

1320

if(restore_loglevel){

1115

1324

perror("klogctl");

1116

1325

}

1117

1326

}

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");

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;

1133

1347

}

1134

1348

1135

1349

ret = init_gnutls_global(pubkey, seckey);

1141

1355

gnutls_initialized = true;

1142

1356

}

1143

1357

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1144

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1145

1365

perror("mkdtemp");

1146

1366

goto end;

1147

1367

}

1148

tempdir_created = true;

1368

1369

if(quit_now){

1370

goto end;

1371

}

1149

1372

1150

1373

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

1151

1374

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

1155

1378

gpgme_initialized = true;

1156

1379

}

1157

1380

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

}

1381

if(quit_now){

1382

goto end;

1165

1383

}

1166

1384

1167

1385

if(connect_to != NULL){

1173

1391

exitcode = EXIT_FAILURE;

1174

1392

goto end;

1175

1393

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1176

1399

uint16_t port;

1177

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

1178

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

1179

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){

1180

1404

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

1181

1405

exitcode = EXIT_FAILURE;

1182

1406

goto end;

1183

1407

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1184

1413

port = (uint16_t)tmpmax;

1185

1414

*address = '\0';

1186

1415

address = connect_to;

1191

1420

} else {

1192

1421

af = AF_INET;

1193

1422

}

1194

ret = start_mandos_communication(address, port, if_index,

1195

af);

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1428

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

1196

1429

if(ret < 0){

1197

1430

exitcode = EXIT_FAILURE;

1198

1431

} else {

1200

1433

}

1201

1434

goto end;

1202

1435

}

1203

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1204

1441

{

1205

1442

AvahiServerConfig config;

1206

1443

/* Do not publish any local Zeroconf records */

1227

1464

goto end;

1228

1465

}

1229

1466

1467

if(quit_now){

1468

goto end;

1469

}

1470

1230

1471

/* Create the Avahi service browser */

1231

1472

sb = avahi_s_service_browser_new(mc.server, if_index,

1232

AVAHI_PROTO_INET6, "_mandos._tcp",

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1233

1474

NULL, 0, browse_callback, NULL);

1234

1475

if(sb == NULL){

1235

1476

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

1238

1479

goto end;

1239

1480

}

1240

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1241

1486

/* Run the main loop */

1242

1487

1243

1488

if(debug){

1272

1517

gpgme_release(mc.ctx);

1273

1518

}

1274

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

1275

1552

/* Removes the temp directory used by GPGME */

1276

1553

if(tempdir_created){

1277

1554

DIR *d;

1316

1593

}

1317

1594

}

1318

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

1319

1615

return exitcode;

1320

1616

}