/mandos/trunk : revision 423

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid() */

74

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

75

setgid(), pause() */

76

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

77

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

78

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

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

87

86

88

#ifdef __linux__

87

89

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

125

127

static const char mandos_protocol_version[] = "1";

126

128

const char *argp_program_version = "mandos-client " VERSION;

127

129

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

130

static const char sys_class_net[] = "/sys/class/net";

131

char *connect_to = NULL;

128

132

129

133

/* Used for passing in values through the Avahi callback functions */

130

134

typedef struct {

142

146

.dh_bits = 1024, .priority = "SECURE256"

143

147

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

144

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

145

152

/*

146

153

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

147

154

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

164

171

*/

165

172

static bool init_gpgme(const char *seckey,

166

173

const char *pubkey, const char *tempdir){

167

int ret;

168

174

gpgme_error_t rc;

169

175

gpgme_engine_info_t engine_info;

170

176

173

179

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

174

180

*/

175

181

bool import_key(const char *filename){

182

int ret;

176

183

int fd;

177

184

gpgme_data_t pgp_data;

178

185

474

481

static int init_gnutls_session(gnutls_session_t *session){

475

482

int ret;

476

483

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

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

478

490

if(ret != GNUTLS_E_SUCCESS){

479

491

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

480

492

safer_gnutls_strerror(ret));

482

494

483

495

{

484

496

const char *err;

485

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

497

do {

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

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

486

504

if(ret != GNUTLS_E_SUCCESS){

487

505

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

488

506

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

492

510

}

493

511

}

494

512

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

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

497

521

if(ret != GNUTLS_E_SUCCESS){

498

522

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

499

523

safer_gnutls_strerror(ret));

502

526

}

503

527

504

528

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

530

508

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

532

514

537

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

515

538

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

516

539

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

540

/* Called when a Mandos server is found */

521

541

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

522

542

AvahiIfIndex if_index,

528

548

struct sockaddr_in6 in6;

529

549

} to;

530

550

char *buffer = NULL;

531

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

532

552

size_t buffer_length = 0;

533

553

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

554

size_t written;

536

int retval = 0;

555

int retval = -1;

537

556

gnutls_session_t session;

538

557

int pf; /* Protocol family */

539

558

559

errno = 0;

560

540

561

if(quit_now){

562

errno = EINTR;

541

563

return -1;

542

564

}

543

565

550

572

break;

551

573

default:

552

574

fprintf(stderr, "Bad address family: %d\n", af);

575

errno = EINVAL;

553

576

return -1;

554

577

}

555

578

565

588

566

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

590

if(tcp_sd < 0){

591

int e = errno;

568

592

perror("socket");

569

retval = -1;

593

errno = e;

570

594

goto mandos_end;

571

595

}

572

596

573

597

if(quit_now){

598

errno = EINTR;

574

599

goto mandos_end;

575

600

}

576

601

583

608

ret = inet_pton(af, ip, &to.in.sin_addr);

584

609

}

585

610

if(ret < 0 ){

611

int e = errno;

586

612

perror("inet_pton");

587

retval = -1;

613

errno = e;

588

614

goto mandos_end;

589

615

}

590

616

if(ret == 0){

617

int e = errno;

591

618

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

592

retval = -1;

619

errno = e;

593

620

goto mandos_end;

594

621

}

595

622

if(af == AF_INET6){

603

630

if(if_index == AVAHI_IF_UNSPEC){

604

631

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

605

632

" without a network interface\n");

606

retval = -1;

633

errno = EINVAL;

607

634

goto mandos_end;

608

635

}

609

636

/* Set the network interface number as scope */

616

643

}

617

644

618

645

if(quit_now){

646

errno = EINTR;

619

647

goto mandos_end;

620

648

}

621

649

652

680

}

653

681

654

682

if(quit_now){

683

errno = EINTR;

655

684

goto mandos_end;

656

685

}

657

686

661

690

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

662

691

}

663

692

if(ret < 0){

693

int e = errno;

664

694

perror("connect");

665

retval = -1;

695

errno = e;

666

696

goto mandos_end;

667

697

}

668

698

669

699

if(quit_now){

700

errno = EINTR;

670

701

goto mandos_end;

671

702

}

672

703

677

708

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

678

709

out_size - written));

679

710

if(ret == -1){

711

int e = errno;

680

712

perror("write");

681

retval = -1;

713

errno = e;

682

714

goto mandos_end;

683

715

}

684

716

written += (size_t)ret;

694

726

}

695

727

696

728

if(quit_now){

729

errno = EINTR;

697

730

goto mandos_end;

698

731

}

699

732

}

703

736

}

704

737

705

738

if(quit_now){

739

errno = EINTR;

706

740

goto mandos_end;

707

741

}

708

742

709

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

744

711

745

if(quit_now){

746

errno = EINTR;

712

747

goto mandos_end;

713

748

}

714

749

715

do{

750

do {

716

751

ret = gnutls_handshake(session);

717

752

if(quit_now){

753

errno = EINTR;

718

754

goto mandos_end;

719

755

}

720

756

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

724

760

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

725

761

gnutls_perror(ret);

726

762

}

727

retval = -1;

763

errno = EPROTO;

728

764

goto mandos_end;

729

765

}

730

766

738

774

while(true){

739

775

740

776

if(quit_now){

777

errno = EINTR;

741

778

goto mandos_end;

742

779

}

743

780

744

781

buffer_capacity = incbuffer(&buffer, buffer_length,

745

782

buffer_capacity);

746

783

if(buffer_capacity == 0){

784

int e = errno;

747

785

perror("incbuffer");

748

retval = -1;

786

errno = e;

749

787

goto mandos_end;

750

788

}

751

789

752

790

if(quit_now){

791

errno = EINTR;

753

792

goto mandos_end;

754

793

}

755

794

764

803

case GNUTLS_E_AGAIN:

765

804

break;

766

805

case GNUTLS_E_REHANDSHAKE:

767

do{

806

do {

768

807

ret = gnutls_handshake(session);

769

808

770

809

if(quit_now){

810

errno = EINTR;

771

811

goto mandos_end;

772

812

}

773

813

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

774

814

if(ret < 0){

775

815

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

776

816

gnutls_perror(ret);

777

retval = -1;

817

errno = EPROTO;

778

818

goto mandos_end;

779

819

}

780

820

break;

781

821

default:

782

822

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

783

823

" encrypted session with Mandos server\n");

784

retval = -1;

785

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

786

826

goto mandos_end;

787

827

}

788

828

} else {

795

835

}

796

836

797

837

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

838

errno = EINTR;

839

goto mandos_end;

840

}

841

842

do {

843

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

844

if(quit_now){

845

errno = EINTR;

846

goto mandos_end;

847

}

848

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

806

849

807

850

if(buffer_length > 0){

851

ssize_t decrypted_buffer_size;

808

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

853

buffer_length,

810

854

&decrypted_buffer);

811

855

if(decrypted_buffer_size >= 0){

856

812

857

written = 0;

813

858

while(written < (size_t) decrypted_buffer_size){

814

859

if(quit_now){

860

errno = EINTR;

815

861

goto mandos_end;

816

862

}

817

863

819

865

(size_t)decrypted_buffer_size - written,

820

866

stdout);

821

867

if(ret == 0 and ferror(stdout)){

868

int e = errno;

822

869

if(debug){

823

870

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

824

871

strerror(errno));

825

872

}

826

retval = -1;

827

break;

873

errno = e;

874

goto mandos_end;

828

875

}

829

876

written += (size_t)ret;

830

877

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

878

retval = 0;

834

879

}

835

} else {

836

retval = -1;

837

880

}

838

881

839

882

/* Shutdown procedure */

840

883

841

884

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

885

{

886

int e = errno;

887

free(decrypted_buffer);

888

free(buffer);

889

if(tcp_sd >= 0){

890

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

891

}

892

if(ret == -1){

893

if(e == 0){

894

e = errno;

895

}

896

perror("close");

897

}

898

gnutls_deinit(session);

899

if(quit_now){

900

e = EINTR;

901

retval = -1;

902

}

903

errno = e;

852

904

}

853

905

return retval;

854

906

}

970

1022

errno = old_errno;

971

1023

}

972

1024

1025

/*

1026

* This function determines if a directory entry in /sys/class/net

1027

* corresponds to an acceptable network device.

1028

* (This function is passed to scandir(3) as a filter function.)

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

if(if_entry->d_name[0] == '.'){

1040

return 0;

1041

}

1042

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1048

/* read line from flags_fd */

1049

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1050

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1051

flagstring[(size_t)to_read] = '\0';

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

tmpmax = strtoimax(flagstring, &tmp, 0);

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1079

if(debug){

1080

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1081

flagstring, if_entry->d_name);

1082

}

1083

free(flagstring);

1084

return 0;

1085

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1088

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1090

if(debug){

1091

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1092

if_entry->d_name);

1093

}

1094

return 0;

1095

}

1096

/* Accept point-to-point devices only if connect_to is specified */

1097

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1098

if(debug){

1099

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1100

if_entry->d_name);

1101

}

1102

return 1;

1103

}

1104

/* Otherwise, reject non-broadcast-capable devices */

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1112

/* Accept this device */

1113

if(debug){

1114

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1115

if_entry->d_name);

1116

}

1117

return 1;

1118

}

1119

973

1120

int main(int argc, char *argv[]){

974

1121

AvahiSServiceBrowser *sb = NULL;

975

1122

int error;

977

1124

intmax_t tmpmax;

978

1125

char *tmp;

979

1126

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

1127

const char *interface = "";

981

1128

struct ifreq network;

982

1129

int sd = -1;

983

1130

bool take_down_interface = false;

984

1131

uid_t uid;

985

1132

gid_t gid;

986

char *connect_to = NULL;

987

1133

char tempdir[] = "/tmp/mandosXXXXXX";

988

1134

bool tempdir_created = false;

989

1135

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

994

1140

bool gpgme_initialized = false;

995

1141

float delay = 2.5f;

996

1142

997

struct sigaction old_sigterm_action;

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

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

1150

errno = 0;

1151

ret = setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

/* Lower user privileges (temporarily) */

1157

errno = 0;

1158

ret = seteuid(uid);

1159

if(ret == -1){

1160

perror("seteuid");

1161

}

1162

1163

if(quit_now){

1164

goto end;

1165

}

1166

1000

1167

{

1001

1168

struct argp_option options[] = {

1002

1169

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

1031

1198

.arg = "SECONDS",

1032

1199

.doc = "Maximum delay to wait for interface startup",

1033

1200

.group = 2 },

1201

/*

1202

* These reproduce what we would get without ARGP_NO_HELP

1203

*/

1204

{ .name = "help", .key = '?',

1205

.doc = "Give this help list", .group = -1 },

1206

{ .name = "usage", .key = -3,

1207

.doc = "Give a short usage message", .group = -1 },

1208

{ .name = "version", .key = 'V',

1209

.doc = "Print program version", .group = -1 },

1034

1210

{ .name = NULL }

1035

1211

};

1036

1212

1037

1213

error_t parse_opt(int key, char *arg,

1038

1214

struct argp_state *state){

1215

errno = 0;

1039

1216

switch(key){

1040

1217

case 128: /* --debug */

1041

1218

debug = true;

1057

1234

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

1058

1235

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

1059

1236

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

1060

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

1061

exit(EXIT_FAILURE);

1237

argp_error(state, "Bad number of DH bits");

1062

1238

}

1063

1239

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1064

1240

break;

1069

1245

errno = 0;

1070

1246

delay = strtof(arg, &tmp);

1071

1247

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

1072

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

1073

exit(EXIT_FAILURE);

1248

argp_error(state, "Bad delay");

1074

1249

}

1075

1250

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1251

/*

1252

* These reproduce what we would get without ARGP_NO_HELP

1253

*/

1254

case '?': /* --help */

1255

argp_state_help(state, state->out_stream,

1256

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1257

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1258

case -3: /* --usage */

1259

argp_state_help(state, state->out_stream,

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

case 'V': /* --version */

1262

fprintf(state->out_stream, "%s\n", argp_program_version);

1263

exit(argp_err_exit_status);

1079

1264

break;

1080

1265

default:

1081

1266

return ARGP_ERR_UNKNOWN;

1082

1267

}

1083

return 0;

1268

return errno;

1084

1269

}

1085

1270

1086

1271

struct argp argp = { .options = options, .parser = parse_opt,

1087

1272

.args_doc = "",

1088

1273

.doc = "Mandos client -- Get and decrypt"

1089

1274

" passwords from a Mandos server" };

1090

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

fprintf(stderr, "Unknown error while parsing arguments\n");

1093

exitcode = EXIT_FAILURE;

1275

ret = argp_parse(&argp, argc, argv,

1276

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1277

switch(ret){

1278

case 0:

1279

break;

1280

case ENOMEM:

1281

default:

1282

errno = ret;

1283

perror("argp_parse");

1284

exitcode = EX_OSERR;

1285

goto end;

1286

case EINVAL:

1287

exitcode = EX_USAGE;

1094

1288

goto end;

1095

1289

}

1096

1290

}

1098

1292

if(not debug){

1099

1293

avahi_set_log_function(empty_log);

1100

1294

}

1295

1296

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

1297

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1299

alphasort);

1300

if(ret >= 1){

1301

/* Pick the first good interface */

1302

interface = strdup(direntries[0]->d_name);

1303

if(debug){

1304

fprintf(stderr, "Using interface \"%s\"\n", interface);

1305

}

1306

if(interface == NULL){

1307

perror("malloc");

1308

free(direntries);

1309

exitcode = EXIT_FAILURE;

1310

goto end;

1311

}

1312

free(direntries);

1313

} else {

1314

free(direntries);

1315

fprintf(stderr, "Could not find a network interface\n");

1316

exitcode = EXIT_FAILURE;

1317

goto end;

1318

}

1319

}

1101

1320

1102

1321

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

1103

1322

from the signal handler */

1106

1325

mc.simple_poll = avahi_simple_poll_new();

1107

1326

if(mc.simple_poll == NULL){

1108

1327

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

1109

exitcode = EXIT_FAILURE;

1328

exitcode = EX_UNAVAILABLE;

1110

1329

goto end;

1111

1330

}

1112

1331

1114

1333

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

1115

1334

if(ret == -1){

1116

1335

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1336

exitcode = EX_OSERR;

1118

1337

goto end;

1119

1338

}

1120

1339

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

1121

1340

if(ret == -1){

1122

1341

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1342

exitcode = EX_OSERR;

1124

1343

goto end;

1125

1344

}

1126

1345

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

1127

1346

if(ret == -1){

1128

1347

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1348

exitcode = EX_OSERR;

1130

1349

goto end;

1131

1350

}

1132

1351

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

1136

1355

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

1137

1356

if(ret == -1){

1138

1357

perror("sigaction");

1139

return EXIT_FAILURE;

1358

return EX_OSERR;

1140

1359

}

1141

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1361

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

1143

1362

if(ret == -1){

1144

1363

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1364

exitcode = EX_OSERR;

1146

1365

goto end;

1147

1366

}

1148

1367

}

1149

1368

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

1150

1369

if(ret == -1){

1151

1370

perror("sigaction");

1152

return EXIT_FAILURE;

1371

return EX_OSERR;

1153

1372

}

1154

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1374

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

1156

1375

if(ret == -1){

1157

1376

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1377

exitcode = EX_OSERR;

1159

1378

goto end;

1160

1379

}

1161

1380

}

1162

1381

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

1163

1382

if(ret == -1){

1164

1383

perror("sigaction");

1165

return EXIT_FAILURE;

1384

return EX_OSERR;

1166

1385

}

1167

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1387

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

1169

1388

if(ret == -1){

1170

1389

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1390

exitcode = EX_OSERR;

1172

1391

goto end;

1173

1392

}

1174

1393

}

1175

1394

1176

1395

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

1177

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

1396

if(strcmp(interface, "none") != 0){

1178

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1398

if(if_index == 0){

1180

1399

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

1181

exitcode = EXIT_FAILURE;

1400

exitcode = EX_UNAVAILABLE;

1182

1401

goto end;

1183

1402

}

1184

1403

1186

1405

goto end;

1187

1406

}

1188

1407

1408

/* Re-raise priviliges */

1409

errno = 0;

1410

ret = seteuid(0);

1411

if(ret == -1){

1412

perror("seteuid");

1413

}

1414

1189

1415

#ifdef __linux__

1190

1416

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1417

messages about the network interface to mess up the prompt */

1192

1418

ret = klogctl(8, NULL, 5);

1193

1419

bool restore_loglevel = true;

1194

1420

if(ret == -1){

1200

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1427

if(sd < 0){

1202

1428

perror("socket");

1203

exitcode = EXIT_FAILURE;

1429

exitcode = EX_OSERR;

1204

1430

#ifdef __linux__

1205

1431

if(restore_loglevel){

1206

1432

ret = klogctl(7, NULL, 0);

1209

1435

}

1210

1436

}

1211

1437

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

1441

if(ret == -1){

1442

perror("seteuid");

1443

}

1212

1444

goto end;

1213

1445

}

1214

1446

strcpy(network.ifr_name, interface);

1223

1455

}

1224

1456

}

1225

1457

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

1462

if(ret == -1){

1463

perror("seteuid");

1464

}

1227

1465

goto end;

1228

1466

}

1229

1467

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

1232

1470

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

1233

1471

if(ret == -1){

1234

1472

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

1237

1475

#ifdef __linux__

1238

1476

if(restore_loglevel){

1239

1477

ret = klogctl(7, NULL, 0);

1242

1480

}

1243

1481

}

1244

1482

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1245

1489

goto end;

1246

1490

}

1247

1491

}

1275

1519

}

1276

1520

}

1277

1521

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1522

/* Lower privileges */

1523

errno = 0;

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

1536

}

1296

1537

}

1297

1538

1298

1539

if(quit_now){

1302

1543

ret = init_gnutls_global(pubkey, seckey);

1303

1544

if(ret == -1){

1304

1545

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

1305

exitcode = EXIT_FAILURE;

1546

exitcode = EX_UNAVAILABLE;

1306

1547

goto end;

1307

1548

} else {

1308

1549

gnutls_initialized = true;

1325

1566

1326

1567

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

1327

1568

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

1328

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1329

1570

goto end;

1330

1571

} else {

1331

1572

gpgme_initialized = true;

1341

1582

char *address = strrchr(connect_to, ':');

1342

1583

if(address == NULL){

1343

1584

fprintf(stderr, "No colon in address\n");

1344

exitcode = EXIT_FAILURE;

1585

exitcode = EX_USAGE;

1345

1586

goto end;

1346

1587

}

1347

1588

1355

1596

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

1356

1597

or tmpmax != (uint16_t)tmpmax){

1357

1598

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

1358

exitcode = EXIT_FAILURE;

1599

exitcode = EX_USAGE;

1359

1600

goto end;

1360

1601

}

1361

1602

1380

1621

1381

1622

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

1382

1623

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1384

1643

} else {

1385

1644

exitcode = EXIT_SUCCESS;

1386

1645

}

1413

1672

if(mc.server == NULL){

1414

1673

fprintf(stderr, "Failed to create Avahi server: %s\n",

1415

1674

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

1675

exitcode = EX_UNAVAILABLE;

1417

1676

goto end;

1418

1677

}

1419

1678

1428

1687

if(sb == NULL){

1429

1688

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

1430

1689

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

1690

exitcode = EX_UNAVAILABLE;

1432

1691

goto end;

1433

1692

}

1434

1693

1472

1731

1473

1732

/* Take down the network interface */

1474

1733

if(take_down_interface){

1475

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

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1476

1737

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

1738

perror("seteuid");

1484

1739

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1740

if(geteuid() == 0){

1741

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

1742

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

1745

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

1746

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

1747

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1749

}

1750

}

1751

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

1752

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

1760

}

1488

1761

}

1489

1762

}

1490

1763

1535

1808

if(quit_now){

1536

1809

sigemptyset(&old_sigterm_action.sa_mask);

1537

1810

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

1811

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1812

&old_sigterm_action,

1813

NULL));

1539

1814

if(ret == -1){

1540

1815

perror("sigaction");

1541

1816

}

1542

raise(signal_received);

1817

do {

1818

ret = raise(signal_received);

1819

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

1820

if(ret != 0){

1821

perror("raise");

1822

abort();

1823

}

1824

TEMP_FAILURE_RETRY(pause());

1543

1825

}

1544

1826

1545

1827

return exitcode;