/mandos/trunk : revision 24.1.134

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

138

131

} mandos_context;

139

132

140

133

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

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;

134

mandos_context mc;

147

135

148

136

/*

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.

137

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

138

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

139

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

152

140

*/

153

141

size_t incbuffer(char **buffer, size_t buffer_length,

154

142

size_t buffer_capacity){

167

155

*/

168

156

static bool init_gpgme(const char *seckey,

169

157

const char *pubkey, const char *tempdir){

158

int ret;

170

159

gpgme_error_t rc;

171

160

gpgme_engine_info_t engine_info;

172

161

175

164

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

176

165

*/

177

166

bool import_key(const char *filename){

178

int ret;

179

167

int fd;

180

168

gpgme_data_t pgp_data;

181

169

208

196

}

209

197

210

198

if(debug){

211

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

199

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

212

200

}

213

201

214

202

/* Init GPGME */

252

240

return false;

253

241

}

254

242

255

return true;

243

return true;

256

244

}

257

245

258

246

/*

312

300

}

313

301

gpgme_recipient_t recipient;

314

302

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;

303

if(recipient){

304

while(recipient != NULL){

305

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

306

gpgme_pubkey_algo_name(recipient->pubkey_algo));

307

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

308

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

309

recipient->status == GPG_ERR_NO_SECKEY

310

? "No" : "Yes");

311

recipient = recipient->next;

312

}

323

313

}

324

314

}

325

315

}

477

467

static int init_gnutls_session(gnutls_session_t *session){

478

468

int ret;

479

469

/* 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);

470

ret = gnutls_init(session, GNUTLS_SERVER);

486

471

if(ret != GNUTLS_E_SUCCESS){

487

472

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

488

473

safer_gnutls_strerror(ret));

490

475

491

476

{

492

477

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);

478

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

500

479

if(ret != GNUTLS_E_SUCCESS){

501

480

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

502

481

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

506

485

}

507

486

}

508

487

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);

488

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

489

mc.cred);

517

490

if(ret != GNUTLS_E_SUCCESS){

518

491

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

519

492

safer_gnutls_strerror(ret));

522

495

}

523

496

524

497

/* ignore client certificate if any. */

525

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

498

gnutls_certificate_server_set_request(*session,

499

GNUTLS_CERT_IGNORE);

526

500

527

501

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

528

502

537

511

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

538

512

AvahiIfIndex if_index,

539

513

int af){

540

int ret, tcp_sd = -1;

514

int ret, tcp_sd;

541

515

ssize_t sret;

542

516

union {

543

517

struct sockaddr_in in;

544

518

struct sockaddr_in6 in6;

545

519

} to;

546

520

char *buffer = NULL;

547

char *decrypted_buffer = NULL;

521

char *decrypted_buffer;

548

522

size_t buffer_length = 0;

549

523

size_t buffer_capacity = 0;

524

ssize_t decrypted_buffer_size;

550

525

size_t written;

551

int retval = -1;

526

int retval = 0;

552

527

gnutls_session_t session;

553

528

int pf; /* Protocol family */

554

529

555

if(quit_now){

556

return -1;

557

}

558

559

530

switch(af){

560

531

case AF_INET6:

561

532

pf = PF_INET6;

581

552

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

553

if(tcp_sd < 0){

583

554

perror("socket");

584

goto mandos_end;

585

}

586

587

if(quit_now){

588

goto mandos_end;

555

return -1;

589

556

}

590

557

591

558

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

592

559

if(af == AF_INET6){

593

to.in6.sin6_family = (sa_family_t)af;

560

to.in6.sin6_family = (uint16_t)af;

594

561

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

595

562

} else { /* IPv4 */

596

563

to.in.sin_family = (sa_family_t)af;

598

565

}

599

566

if(ret < 0 ){

600

567

perror("inet_pton");

601

goto mandos_end;

568

return -1;

602

569

}

603

570

if(ret == 0){

604

571

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

605

goto mandos_end;

572

return -1;

606

573

}

607

574

if(af == AF_INET6){

608

575

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

615

582

if(if_index == AVAHI_IF_UNSPEC){

616

583

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

617

584

" without a network interface\n");

618

goto mandos_end;

585

return -1;

619

586

}

620

587

/* Set the network interface number as scope */

621

588

to.in6.sin6_scope_id = (uint32_t)if_index;

626

593

-Wunreachable-code */

627

594

}

628

595

629

if(quit_now){

630

goto mandos_end;

631

}

632

633

596

if(debug){

634

597

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

635

598

char interface[IF_NAMESIZE];

662

625

}

663

626

}

664

627

665

if(quit_now){

666

goto mandos_end;

667

}

668

669

628

if(af == AF_INET6){

670

629

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

671

630

} else {

673

632

}

674

633

if(ret < 0){

675

634

perror("connect");

676

goto mandos_end;

677

}

678

679

if(quit_now){

680

goto mandos_end;

635

return -1;

681

636

}

682

637

683

638

const char *out = mandos_protocol_version;

688

643

out_size - written));

689

644

if(ret == -1){

690

645

perror("write");

646

retval = -1;

691

647

goto mandos_end;

692

648

}

693

649

written += (size_t)ret;

701

657

break;

702

658

}

703

659

}

704

705

if(quit_now){

706

goto mandos_end;

707

}

708

660

}

709

661

710

662

if(debug){

711

663

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

712

664

}

713

665

714

if(quit_now){

715

goto mandos_end;

716

}

717

718

666

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

667

720

if(quit_now){

721

goto mandos_end;

722

}

723

724

do {

668

do{

725

669

ret = gnutls_handshake(session);

726

if(quit_now){

727

goto mandos_end;

728

}

729

670

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

730

671

731

672

if(ret != GNUTLS_E_SUCCESS){

733

674

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

734

675

gnutls_perror(ret);

735

676

}

677

retval = -1;

736

678

goto mandos_end;

737

679

}

738

680

744

686

}

745

687

746

688

while(true){

747

748

if(quit_now){

749

goto mandos_end;

750

}

751

752

689

buffer_capacity = incbuffer(&buffer, buffer_length,

753

690

buffer_capacity);

754

691

if(buffer_capacity == 0){

755

692

perror("incbuffer");

756

goto mandos_end;

757

}

758

759

if(quit_now){

693

retval = -1;

760

694

goto mandos_end;

761

695

}

762

696

771

705

case GNUTLS_E_AGAIN:

772

706

break;

773

707

case GNUTLS_E_REHANDSHAKE:

774

do {

708

do{

775

709

ret = gnutls_handshake(session);

776

777

if(quit_now){

778

goto mandos_end;

779

}

780

710

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

781

711

if(ret < 0){

782

712

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

783

713

gnutls_perror(ret);

714

retval = -1;

784

715

goto mandos_end;

785

716

}

786

717

break;

787

718

default:

788

719

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

789

720

" encrypted session with Mandos server\n");

721

retval = -1;

790

722

gnutls_bye(session, GNUTLS_SHUT_RDWR);

791

723

goto mandos_end;

792

724

}

799

731

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

800

732

}

801

733

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);

734

gnutls_bye(session, GNUTLS_SHUT_RDWR);

812

735

813

736

if(buffer_length > 0){

814

ssize_t decrypted_buffer_size;

815

737

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

738

buffer_length,

817

739

&decrypted_buffer);

818

740

if(decrypted_buffer_size >= 0){

819

820

741

written = 0;

821

742

while(written < (size_t) decrypted_buffer_size){

822

if(quit_now){

823

goto mandos_end;

824

}

825

826

743

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

827

744

(size_t)decrypted_buffer_size - written,

828

745

stdout);

831

748

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

832

749

strerror(errno));

833

750

}

834

goto mandos_end;

751

retval = -1;

752

break;

835

753

}

836

754

written += (size_t)ret;

837

755

}

838

retval = 0;

756

free(decrypted_buffer);

757

} else {

758

retval = -1;

839

759

}

760

} else {

761

retval = -1;

840

762

}

841

763

842

764

/* Shutdown procedure */

843

765

844

766

mandos_end:

845

free(decrypted_buffer);

846

767

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

768

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

850

769

if(ret == -1){

851

770

perror("close");

852

771

}

853

772

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

856

}

857

773

return retval;

858

774

}

859

775

870

786

AVAHI_GCC_UNUSED AvahiStringList *txt,

871

787

AVAHI_GCC_UNUSED AvahiLookupResultFlags

872

788

flags,

873

AVAHI_GCC_UNUSED void* userdata){

789

__attribute__((unused)) void* userdata){

874

790

assert(r);

875

791

876

792

/* Called whenever a service has been resolved successfully or

877

793

timed out */

878

794

879

if(quit_now){

880

return;

881

}

882

883

795

switch(event){

884

796

default:

885

797

case AVAHI_RESOLVER_FAILURE:

916

828

const char *domain,

917

829

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

830

flags,

919

AVAHI_GCC_UNUSED void* userdata){

831

__attribute__((unused)) void* userdata){

920

832

assert(b);

921

833

922

834

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

923

835

is removed from the LAN */

924

836

925

if(quit_now){

926

return;

927

}

928

929

837

switch(event){

930

838

default:

931

839

case AVAHI_BROWSER_FAILURE:

941

849

the callback function is called the Avahi server will free the

942

850

resolver for us. */

943

851

944

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

945

name, type, domain, protocol, 0,

946

resolve_callback, NULL) == NULL)

852

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

853

protocol, name, type, domain,

854

AVAHI_PROTO_INET6, 0,

855

resolve_callback, NULL)))

947

856

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

948

857

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

949

858

break;

960

869

}

961

870

}

962

871

963

/* 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;

872

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

970

873

int old_errno = errno;

971

if(mc.simple_poll != NULL){

972

avahi_simple_poll_quit(mc.simple_poll);

973

}

874

avahi_simple_poll_quit(mc.simple_poll);

974

875

errno = old_errno;

975

876

}

976

877

979

880

int error;

980

881

int ret;

981

882

intmax_t tmpmax;

982

char *tmp;

883

int numchars;

983

884

int exitcode = EXIT_SUCCESS;

984

885

const char *interface = "eth0";

985

886

struct ifreq network;

986

int sd = -1;

987

bool take_down_interface = false;

887

int sd;

988

888

uid_t uid;

989

889

gid_t gid;

990

890

char *connect_to = NULL;

996

896

997

897

bool gnutls_initialized = false;

998

898

bool gpgme_initialized = false;

999

float delay = 2.5f;

1000

1001

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

899

double delay = 2.5;

900

901

struct sigaction old_sigterm_action;

1002

902

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

}

903

904

/* Initialize mandos context */

905

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

906

.dh_bits = 1024, .priority = "SECURE256"

907

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

1024

908

1025

909

{

1026

910

struct argp_option options[] = {

1078

962

pubkey = arg;

1079

963

break;

1080

964

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){

965

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

966

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

967

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

1085

968

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

1086

969

exit(EXIT_FAILURE);

1087

970

}

1091

974

mc.priority = arg;

1092

975

break;

1093

976

case 131: /* --delay */

1094

errno = 0;

1095

delay = strtof(arg, &tmp);

1096

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

977

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

978

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

1097

979

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

1098

980

exit(EXIT_FAILURE);

1099

981

}

1120

1002

}

1121

1003

}

1122

1004

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

1201

1005

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

1202

1006

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

1007

#ifdef __linux__

1222

1008

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

1009

messages to mess up the prompt */

1227

1013

restore_loglevel = false;

1228

1014

perror("klogctl");

1229

1015

}

1230

#endif /* __linux__ */

1016

#endif

1231

1017

1232

1018

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1019

if(sd < 0){

1240

1026

perror("klogctl");

1241

1027

}

1242

1028

}

1243

#endif /* __linux__ */

1244

/* Lower privileges */

1245

errno = 0;

1246

ret = seteuid(uid);

1247

if(ret == -1){

1248

perror("seteuid");

1249

}

1029

#endif

1250

1030

goto end;

1251

1031

}

1252

1032

strcpy(network.ifr_name, interface);

1260

1040

perror("klogctl");

1261

1041

}

1262

1042

}

1263

#endif /* __linux__ */

1043

#endif

1264

1044

exitcode = EXIT_FAILURE;

1265

/* Lower privileges */

1266

errno = 0;

1267

ret = seteuid(uid);

1268

if(ret == -1){

1269

perror("seteuid");

1270

}

1271

1045

goto end;

1272

1046

}

1273

1047

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

1274

1048

network.ifr_flags |= IFF_UP;

1275

take_down_interface = true;

1276

1049

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

1277

1050

if(ret == -1){

1278

take_down_interface = false;

1279

1051

perror("ioctl SIOCSIFFLAGS");

1280

1052

exitcode = EXIT_FAILURE;

1281

1053

#ifdef __linux__

1285

1057

perror("klogctl");

1286

1058

}

1287

1059

}

1288

#endif /* __linux__ */

1289

/* Lower privileges */

1290

errno = 0;

1291

ret = seteuid(uid);

1292

if(ret == -1){

1293

perror("seteuid");

1294

}

1060

#endif

1295

1061

goto end;

1296

1062

}

1297

1063

}

1309

1075

perror("nanosleep");

1310

1076

}

1311

1077

}

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

}

1078

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

1079

if(ret == -1){

1080

perror("close");

1318

1081

}

1319

1082

#ifdef __linux__

1320

1083

if(restore_loglevel){

1324

1087

perror("klogctl");

1325

1088

}

1326

1089

}

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;

1090

#endif

1091

}

1092

1093

uid = getuid();

1094

gid = getgid();

1095

1096

errno = 0;

1097

setgid(gid);

1098

if(ret == -1){

1099

perror("setgid");

1100

}

1101

1102

ret = setuid(uid);

1103

if(ret == -1){

1104

perror("setuid");

1347

1105

}

1348

1106

1349

1107

ret = init_gnutls_global(pubkey, seckey);

1355

1113

gnutls_initialized = true;

1356

1114

}

1357

1115

1358

if(quit_now){

1359

goto end;

1360

}

1361

1362

tempdir_created = true;

1363

1116

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

1117

perror("mkdtemp");

1366

1118

goto end;

1367

1119

}

1368

1369

if(quit_now){

1370

goto end;

1371

}

1120

tempdir_created = true;

1372

1121

1373

1122

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

1374

1123

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

1378

1127

gpgme_initialized = true;

1379

1128

}

1380

1129

1381

if(quit_now){

1382

goto end;

1130

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

1131

if_index = (AvahiIfIndex) if_nametoindex(interface);

1132

if(if_index == 0){

1133

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

1134

exitcode = EXIT_FAILURE;

1135

goto end;

1136

}

1383

1137

}

1384

1138

1385

1139

if(connect_to != NULL){

1391

1145

exitcode = EXIT_FAILURE;

1392

1146

goto end;

1393

1147

}

1394

1395

if(quit_now){

1396

goto end;

1397

}

1398

1399

1148

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){

1149

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

1150

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

1151

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

1404

1152

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

1405

1153

exitcode = EXIT_FAILURE;

1406

1154

goto end;

1407

1155

}

1408

1409

if(quit_now){

1410

goto end;

1411

}

1412

1413

1156

port = (uint16_t)tmpmax;

1414

1157

*address = '\0';

1415

1158

address = connect_to;

1420

1163

} else {

1421

1164

af = AF_INET;

1422

1165

}

1423

1424

if(quit_now){

1425

goto end;

1426

}

1427

1428

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

1166

ret = start_mandos_communication(address, port, if_index,

1167

af);

1429

1168

if(ret < 0){

1430

1169

exitcode = EXIT_FAILURE;

1431

1170

} else {

1434

1173

goto end;

1435

1174

}

1436

1175

1437

if(quit_now){

1176

if(not debug){

1177

avahi_set_log_function(empty_log);

1178

}

1179

1180

/* Initialize the pseudo-RNG for Avahi */

1181

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

1182

1183

/* Allocate main Avahi loop object */

1184

mc.simple_poll = avahi_simple_poll_new();

1185

if(mc.simple_poll == NULL){

1186

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

1187

exitcode = EXIT_FAILURE;

1438

1188

goto end;

1439

1189

}

1440

1190

1464

1214

goto end;

1465

1215

}

1466

1216

1467

if(quit_now){

1468

goto end;

1469

}

1470

1471

1217

/* Create the Avahi service browser */

1472

1218

sb = avahi_s_service_browser_new(mc.server, if_index,

1473

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1219

AVAHI_PROTO_INET6, "_mandos._tcp",

1474

1220

NULL, 0, browse_callback, NULL);

1475

1221

if(sb == NULL){

1476

1222

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

1478

1224

exitcode = EXIT_FAILURE;

1479

1225

goto end;

1480

1226

}

1481

1482

if(quit_now){

1227

1228

sigemptyset(&sigterm_action.sa_mask);

1229

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

1230

if(ret == -1){

1231

perror("sigaddset");

1232

exitcode = EXIT_FAILURE;

1483

1233

goto end;

1484

1234

}

1235

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

1236

if(ret == -1){

1237

perror("sigaction");

1238

exitcode = EXIT_FAILURE;

1239

goto end;

1240

}

1485

1241

1486

1242

/* Run the main loop */

1487

1243

1517

1273

gpgme_release(mc.ctx);

1518

1274

}

1519

1275

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

1276

/* Removes the temp directory used by GPGME */

1553

1277

if(tempdir_created){

1554

1278

DIR *d;

1593

1317

}

1594

1318

}

1595

1319

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

1320

return exitcode;

1616

1321

}