/mandos/release : revision 237.2.71

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() */

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(),

70

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

75

71

setgid() */

76

72

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

77

73

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

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

78

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

85

81

86

82

#ifdef __linux__

87

83

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

138

134

} mandos_context;

139

135

140

136

/* 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" };

137

mandos_context mc;

144

138

145

139

/*

146

140

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

164

158

*/

165

159

static bool init_gpgme(const char *seckey,

166

160

const char *pubkey, const char *tempdir){

161

int ret;

167

162

gpgme_error_t rc;

168

163

gpgme_engine_info_t engine_info;

169

164

172

167

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

173

168

*/

174

169

bool import_key(const char *filename){

175

int ret;

176

170

int fd;

177

171

gpgme_data_t pgp_data;

178

172

249

243

return false;

250

244

}

251

245

252

return true;

246

return true;

253

247

}

254

248

255

249

/*

309

303

}

310

304

gpgme_recipient_t recipient;

311

305

recipient = result->recipients;

312

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

319

recipient = recipient->next;

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

}

320

316

}

321

317

}

322

318

}

474

470

static int init_gnutls_session(gnutls_session_t *session){

475

471

int ret;

476

472

/* GnuTLS session creation */

477

do {

478

ret = gnutls_init(session, GNUTLS_SERVER);

479

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

473

ret = gnutls_init(session, GNUTLS_SERVER);

480

474

if(ret != GNUTLS_E_SUCCESS){

481

475

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

482

476

safer_gnutls_strerror(ret));

484

478

485

479

{

486

480

const char *err;

487

do {

488

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

489

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

481

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

490

482

if(ret != GNUTLS_E_SUCCESS){

491

483

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

492

484

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

496

488

}

497

489

}

498

490

499

do {

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

mc.cred);

502

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

491

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

492

mc.cred);

503

493

if(ret != GNUTLS_E_SUCCESS){

504

494

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

505

495

safer_gnutls_strerror(ret));

508

498

}

509

499

510

500

/* ignore client certificate if any. */

511

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

501

gnutls_certificate_server_set_request(*session,

502

GNUTLS_CERT_IGNORE);

512

503

513

504

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

514

505

519

510

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

520

511

__attribute__((unused)) const char *txt){}

521

512

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

525

513

/* Called when a Mandos server is found */

526

514

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

527

515

AvahiIfIndex if_index,

528

516

int af){

529

int ret, tcp_sd = -1;

517

int ret, tcp_sd;

530

518

ssize_t sret;

531

519

union {

532

520

struct sockaddr_in in;

536

524

char *decrypted_buffer;

537

525

size_t buffer_length = 0;

538

526

size_t buffer_capacity = 0;

527

ssize_t decrypted_buffer_size;

539

528

size_t written;

540

529

int retval = 0;

541

530

gnutls_session_t session;

542

531

int pf; /* Protocol family */

543

532

544

if(quit_now){

545

return -1;

546

}

547

548

533

switch(af){

549

534

case AF_INET6:

550

535

pf = PF_INET6;

570

555

tcp_sd = socket(pf, SOCK_STREAM, 0);

571

556

if(tcp_sd < 0){

572

557

perror("socket");

573

retval = -1;

574

goto mandos_end;

575

}

576

577

if(quit_now){

578

goto mandos_end;

558

return -1;

579

559

}

580

560

581

561

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

582

562

if(af == AF_INET6){

583

to.in6.sin6_family = (sa_family_t)af;

563

to.in6.sin6_family = (uint16_t)af;

584

564

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

585

565

} else { /* IPv4 */

586

566

to.in.sin_family = (sa_family_t)af;

588

568

}

589

569

if(ret < 0 ){

590

570

perror("inet_pton");

591

retval = -1;

592

goto mandos_end;

571

return -1;

593

572

}

594

573

if(ret == 0){

595

574

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

596

retval = -1;

597

goto mandos_end;

575

return -1;

598

576

}

599

577

if(af == AF_INET6){

600

578

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

607

585

if(if_index == AVAHI_IF_UNSPEC){

608

586

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

609

587

" without a network interface\n");

610

retval = -1;

611

goto mandos_end;

588

return -1;

612

589

}

613

590

/* Set the network interface number as scope */

614

591

to.in6.sin6_scope_id = (uint32_t)if_index;

619

596

-Wunreachable-code */

620

597

}

621

598

622

if(quit_now){

623

goto mandos_end;

624

}

625

626

599

if(debug){

627

600

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

628

601

char interface[IF_NAMESIZE];

655

628

}

656

629

}

657

630

658

if(quit_now){

659

goto mandos_end;

660

}

661

662

631

if(af == AF_INET6){

663

632

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

664

633

} else {

666

635

}

667

636

if(ret < 0){

668

637

perror("connect");

669

retval = -1;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

goto mandos_end;

638

return -1;

675

639

}

676

640

677

641

const char *out = mandos_protocol_version;

696

660

break;

697

661

}

698

662

}

699

700

if(quit_now){

701

goto mandos_end;

702

}

703

663

}

704

664

705

665

if(debug){

706

666

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

707

667

}

708

668

709

if(quit_now){

710

goto mandos_end;

711

}

712

713

669

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

714

670

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

do {

671

do{

720

672

ret = gnutls_handshake(session);

721

if(quit_now){

722

goto mandos_end;

723

}

724

673

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

725

674

726

675

if(ret != GNUTLS_E_SUCCESS){

740

689

}

741

690

742

691

while(true){

743

744

if(quit_now){

745

goto mandos_end;

746

}

747

748

692

buffer_capacity = incbuffer(&buffer, buffer_length,

749

693

buffer_capacity);

750

694

if(buffer_capacity == 0){

753

697

goto mandos_end;

754

698

}

755

699

756

if(quit_now){

757

goto mandos_end;

758

}

759

760

700

sret = gnutls_record_recv(session, buffer+buffer_length,

761

701

BUFFER_SIZE);

762

702

if(sret == 0){

768

708

case GNUTLS_E_AGAIN:

769

709

break;

770

710

case GNUTLS_E_REHANDSHAKE:

771

do {

711

do{

772

712

ret = gnutls_handshake(session);

773

774

if(quit_now){

775

goto mandos_end;

776

}

777

713

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

778

714

if(ret < 0){

779

715

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

798

734

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

799

735

}

800

736

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

737

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

738

807

if(quit_now){

808

goto mandos_end;

809

}

810

811

739

if(buffer_length > 0){

812

ssize_t decrypted_buffer_size;

813

740

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

741

buffer_length,

815

742

&decrypted_buffer);

816

743

if(decrypted_buffer_size >= 0){

817

818

744

written = 0;

819

745

while(written < (size_t) decrypted_buffer_size){

820

if(quit_now){

821

goto mandos_end;

822

}

823

824

746

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

825

747

(size_t)decrypted_buffer_size - written,

826

748

stdout);

846

768

847

769

mandos_end:

848

770

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

771

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

852

772

if(ret == -1){

853

773

perror("close");

854

774

}

855

775

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

776

return retval;

860

777

}

861

778

878

795

/* Called whenever a service has been resolved successfully or

879

796

timed out */

880

797

881

if(quit_now){

882

return;

883

}

884

885

798

switch(event){

886

799

default:

887

800

case AVAHI_RESOLVER_FAILURE:

924

837

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

925

838

is removed from the LAN */

926

839

927

if(quit_now){

928

return;

929

}

930

931

840

switch(event){

932

841

default:

933

842

case AVAHI_BROWSER_FAILURE:

943

852

the callback function is called the Avahi server will free the

944

853

resolver for us. */

945

854

946

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

947

name, type, domain, protocol, 0,

948

resolve_callback, NULL) == NULL)

855

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

856

protocol, name, type, domain,

857

AVAHI_PROTO_INET6, 0,

858

resolve_callback, NULL)))

949

859

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

950

860

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

951

861

break;

962

872

}

963

873

}

964

874

965

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

966

static void handle_sigterm(int sig){

875

sig_atomic_t quit_now = 0;

876

877

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

967

878

if(quit_now){

968

879

return;

969

880

}

970

881

quit_now = 1;

971

signal_received = sig;

972

882

int old_errno = errno;

973

883

if(mc.simple_poll != NULL){

974

884

avahi_simple_poll_quit(mc.simple_poll);

981

891

int error;

982

892

int ret;

983

893

intmax_t tmpmax;

984

char *tmp;

894

int numchars;

985

895

int exitcode = EXIT_SUCCESS;

986

896

const char *interface = "eth0";

987

897

struct ifreq network;

988

int sd = -1;

989

bool take_down_interface = false;

898

int sd;

990

899

uid_t uid;

991

900

gid_t gid;

992

901

char *connect_to = NULL;

996

905

const char *seckey = PATHDIR "/" SECKEY;

997

906

const char *pubkey = PATHDIR "/" PUBKEY;

998

907

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" };

999

912

bool gnutls_initialized = false;

1000

913

bool gpgme_initialized = false;

1001

float delay = 2.5f;

1002

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

914

double delay = 2.5;

915

916

struct sigaction old_sigterm_action;

1004

917

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1005

918

1006

uid = getuid();

1007

gid = getgid();

1008

1009

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

1010

errno = 0;

1011

ret = setgid(gid);

1012

if(ret == -1){

1013

perror("setgid");

1014

}

1015

1016

/* Lower user privileges (temporarily) */

1017

errno = 0;

1018

ret = seteuid(uid);

1019

if(ret == -1){

1020

perror("seteuid");

1021

}

1022

1023

if(quit_now){

1024

goto end;

1025

}

1026

1027

919

{

1028

920

struct argp_option options[] = {

1029

921

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

1080

972

pubkey = arg;

1081

973

break;

1082

974

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

1083

errno = 0;

1084

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

1085

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

1086

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

975

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

976

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

977

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

1087

978

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

1088

979

exit(EXIT_FAILURE);

1089

980

}

1093

984

mc.priority = arg;

1094

985

break;

1095

986

case 131: /* --delay */

1096

errno = 0;

1097

delay = strtof(arg, &tmp);

1098

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

987

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

988

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

1099

989

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

1100

990

exit(EXIT_FAILURE);

1101

991

}

1122

1012

}

1123

1013

}

1124

1014

1125

if(not debug){

1126

avahi_set_log_function(empty_log);

1127

}

1128

1129

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

1130

from the signal handler */

1131

/* Initialize the pseudo-RNG for Avahi */

1132

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

1133

mc.simple_poll = avahi_simple_poll_new();

1134

if(mc.simple_poll == NULL){

1135

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

1136

exitcode = EXIT_FAILURE;

1137

goto end;

1138

}

1139

1140

sigemptyset(&sigterm_action.sa_mask);

1141

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

1142

if(ret == -1){

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1145

goto end;

1146

}

1147

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

1148

if(ret == -1){

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1151

goto end;

1152

}

1153

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

1154

if(ret == -1){

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1157

goto end;

1158

}

1159

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

1160

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

1161

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

1162

*/

1163

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

1164

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1167

}

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

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

1170

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1173

goto end;

1174

}

1175

}

1176

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

1177

if(ret == -1){

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1180

}

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

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

1183

if(ret == -1){

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

1188

}

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

1203

1015

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

1204

1016

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

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

if(if_index == 0){

1207

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

1208

exitcode = EXIT_FAILURE;

1209

goto end;

1210

}

1211

1212

if(quit_now){

1213

goto end;

1214

}

1215

1216

/* Re-raise priviliges */

1217

errno = 0;

1218

ret = seteuid(0);

1219

if(ret == -1){

1220

perror("seteuid");

1221

}

1222

1223

1017

#ifdef __linux__

1224

1018

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1225

1019

messages to mess up the prompt */

1243

1037

}

1244

1038

}

1245

1039

#endif /* __linux__ */

1246

/* Lower privileges */

1247

errno = 0;

1248

ret = seteuid(uid);

1249

if(ret == -1){

1250

perror("seteuid");

1251

}

1252

1040

goto end;

1253

1041

}

1254

1042

strcpy(network.ifr_name, interface);

1264

1052

}

1265

1053

#endif /* __linux__ */

1266

1054

exitcode = EXIT_FAILURE;

1267

/* Lower privileges */

1268

errno = 0;

1269

ret = seteuid(uid);

1270

if(ret == -1){

1271

perror("seteuid");

1272

}

1273

1055

goto end;

1274

1056

}

1275

1057

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

1276

1058

network.ifr_flags |= IFF_UP;

1277

take_down_interface = true;

1278

1059

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

1279

1060

if(ret == -1){

1280

take_down_interface = false;

1281

1061

perror("ioctl SIOCSIFFLAGS");

1282

1062

exitcode = EXIT_FAILURE;

1283

1063

#ifdef __linux__

1288

1068

}

1289

1069

}

1290

1070

#endif /* __linux__ */

1291

/* Lower privileges */

1292

errno = 0;

1293

ret = seteuid(uid);

1294

if(ret == -1){

1295

perror("seteuid");

1296

}

1297

1071

goto end;

1298

1072

}

1299

1073

}

1311

1085

perror("nanosleep");

1312

1086

}

1313

1087

}

1314

if(not take_down_interface){

1315

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

1316

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

1317

if(ret == -1){

1318

perror("close");

1319

}

1088

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

1089

if(ret == -1){

1090

perror("close");

1320

1091

}

1321

1092

#ifdef __linux__

1322

1093

if(restore_loglevel){

1327

1098

}

1328

1099

}

1329

1100

#endif /* __linux__ */

1330

/* Lower privileges */

1331

errno = 0;

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

1344

}

1345

}

1346

1347

if(quit_now){

1348

goto end;

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");

1349

1115

}

1350

1116

1351

1117

ret = init_gnutls_global(pubkey, seckey);

1357

1123

gnutls_initialized = true;

1358

1124

}

1359

1125

1360

if(quit_now){

1361

goto end;

1362

}

1363

1364

tempdir_created = true;

1365

1126

if(mkdtemp(tempdir) == NULL){

1366

tempdir_created = false;

1367

1127

perror("mkdtemp");

1368

1128

goto end;

1369

1129

}

1370

1371

if(quit_now){

1372

goto end;

1373

}

1130

tempdir_created = true;

1374

1131

1375

1132

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

1376

1133

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

1380

1137

gpgme_initialized = true;

1381

1138

}

1382

1139

1383

if(quit_now){

1384

goto end;

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

}

1385

1147

}

1386

1148

1387

1149

if(connect_to != NULL){

1393

1155

exitcode = EXIT_FAILURE;

1394

1156

goto end;

1395

1157

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1400

1401

1158

uint16_t port;

1402

errno = 0;

1403

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

1404

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

1405

or tmpmax != (uint16_t)tmpmax){

1159

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

1160

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

1161

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

1406

1162

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

1407

1163

exitcode = EXIT_FAILURE;

1408

1164

goto end;

1409

1165

}

1410

1411

if(quit_now){

1412

goto end;

1413

}

1414

1415

1166

port = (uint16_t)tmpmax;

1416

1167

*address = '\0';

1417

1168

address = connect_to;

1422

1173

} else {

1423

1174

af = AF_INET;

1424

1175

}

1425

1426

if(quit_now){

1427

goto end;

1428

}

1429

1430

1176

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

1431

1177

if(ret < 0){

1432

1178

exitcode = EXIT_FAILURE;

1436

1182

goto end;

1437

1183

}

1438

1184

1439

if(quit_now){

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;

1440

1197

goto end;

1441

1198

}

1442

1199

1466

1223

goto end;

1467

1224

}

1468

1225

1469

if(quit_now){

1470

goto end;

1471

}

1472

1473

1226

/* Create the Avahi service browser */

1474

1227

sb = avahi_s_service_browser_new(mc.server, if_index,

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1228

AVAHI_PROTO_INET6, "_mandos._tcp",

1476

1229

NULL, 0, browse_callback, NULL);

1477

1230

if(sb == NULL){

1478

1231

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

1481

1234

goto end;

1482

1235

}

1483

1236

1484

if(quit_now){

1485

goto end;

1486

}

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

}

1487

1262

1488

1263

/* Run the main loop */

1489

1264

1519

1294

gpgme_release(mc.ctx);

1520

1295

}

1521

1296

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

1525

errno = 0;

1526

ret = seteuid(0);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

if(geteuid() == 0){

1531

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

1532

if(ret == -1){

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

1536

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

1537

if(ret == -1){

1538

perror("ioctl SIOCSIFFLAGS");

1539

}

1540

}

1541

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

1542

if(ret == -1){

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

1550

}

1551

}

1552

}

1553

1554

1297

/* Removes the temp directory used by GPGME */

1555

1298

if(tempdir_created){

1556

1299

DIR *d;

1595

1338

}

1596

1339

}

1597

1340

1598

if(quit_now){

1599

sigemptyset(&old_sigterm_action.sa_mask);

1600

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

1602

if(ret == -1){

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

1606

}

1607

1608

1341

return exitcode;

1609

1342

}