/mandos/release : revision 24.1.139

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, srand(),

47

strtof(), abort() */

46

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

47

srand(), strtof() */

48

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

49

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

50

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

63

strtoimax() */

64

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

65

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

66

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

66

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

67

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid(), pause() */

74

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

75

setgid() */

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 */

87

85

88

86

#ifdef __linux__

89

87

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

127

125

static const char mandos_protocol_version[] = "1";

128

126

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

129

127

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;

132

128

133

129

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

134

130

typedef struct {

146

142

.dh_bits = 1024, .priority = "SECURE256"

147

143

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

148

144

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

145

/*

153

146

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

154

147

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

171

164

*/

172

165

static bool init_gpgme(const char *seckey,

173

166

const char *pubkey, const char *tempdir){

167

int ret;

174

168

gpgme_error_t rc;

175

169

gpgme_engine_info_t engine_info;

176

170

179

173

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

180

174

*/

181

175

bool import_key(const char *filename){

182

int ret;

183

176

int fd;

184

177

gpgme_data_t pgp_data;

185

178

481

474

static int init_gnutls_session(gnutls_session_t *session){

482

475

int ret;

483

476

/* GnuTLS session creation */

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);

477

ret = gnutls_init(session, GNUTLS_SERVER);

490

478

if(ret != GNUTLS_E_SUCCESS){

491

479

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

492

480

safer_gnutls_strerror(ret));

494

482

495

483

{

496

484

const char *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);

485

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

504

486

if(ret != GNUTLS_E_SUCCESS){

505

487

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

506

488

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

510

492

}

511

493

}

512

494

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);

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

521

497

if(ret != GNUTLS_E_SUCCESS){

522

498

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

523

499

safer_gnutls_strerror(ret));

526

502

}

527

503

528

504

/* ignore client certificate if any. */

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

530

507

531

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

509

537

514

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

538

515

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

539

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

540

520

/* Called when a Mandos server is found */

541

521

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

542

522

AvahiIfIndex if_index,

548

528

struct sockaddr_in6 in6;

549

529

} to;

550

530

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

552

532

size_t buffer_length = 0;

553

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

554

535

size_t written;

555

int retval = -1;

536

int retval = 0;

556

537

gnutls_session_t session;

557

538

int pf; /* Protocol family */

558

539

559

errno = 0;

560

561

540

if(quit_now){

562

errno = EINTR;

563

541

return -1;

564

542

}

565

543

572

550

break;

573

551

default:

574

552

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

575

errno = EINVAL;

576

553

return -1;

577

554

}

578

555

588

565

589

566

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

567

if(tcp_sd < 0){

591

int e = errno;

592

568

perror("socket");

593

errno = e;

569

retval = -1;

594

570

goto mandos_end;

595

571

}

596

572

597

573

if(quit_now){

598

errno = EINTR;

599

574

goto mandos_end;

600

575

}

601

576

608

583

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

609

584

}

610

585

if(ret < 0 ){

611

int e = errno;

612

586

perror("inet_pton");

613

errno = e;

587

retval = -1;

614

588

goto mandos_end;

615

589

}

616

590

if(ret == 0){

617

int e = errno;

618

591

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

619

errno = e;

592

retval = -1;

620

593

goto mandos_end;

621

594

}

622

595

if(af == AF_INET6){

630

603

if(if_index == AVAHI_IF_UNSPEC){

631

604

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

632

605

" without a network interface\n");

633

errno = EINVAL;

606

retval = -1;

634

607

goto mandos_end;

635

608

}

636

609

/* Set the network interface number as scope */

643

616

}

644

617

645

618

if(quit_now){

646

errno = EINTR;

647

619

goto mandos_end;

648

620

}

649

621

680

652

}

681

653

682

654

if(quit_now){

683

errno = EINTR;

684

655

goto mandos_end;

685

656

}

686

657

690

661

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

691

662

}

692

663

if(ret < 0){

693

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

664

perror("connect");

665

retval = -1;

698

666

goto mandos_end;

699

667

}

700

668

701

669

if(quit_now){

702

errno = EINTR;

703

670

goto mandos_end;

704

671

}

705

672

710

677

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

711

678

out_size - written));

712

679

if(ret == -1){

713

int e = errno;

714

680

perror("write");

715

errno = e;

681

retval = -1;

716

682

goto mandos_end;

717

683

}

718

684

written += (size_t)ret;

728

694

}

729

695

730

696

if(quit_now){

731

errno = EINTR;

732

697

goto mandos_end;

733

698

}

734

699

}

738

703

}

739

704

740

705

if(quit_now){

741

errno = EINTR;

742

706

goto mandos_end;

743

707

}

744

708

745

709

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

710

747

711

if(quit_now){

748

errno = EINTR;

749

712

goto mandos_end;

750

713

}

751

714

752

do {

715

do{

753

716

ret = gnutls_handshake(session);

754

717

if(quit_now){

755

errno = EINTR;

756

718

goto mandos_end;

757

719

}

758

720

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

762

724

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

763

725

gnutls_perror(ret);

764

726

}

765

errno = EPROTO;

727

retval = -1;

766

728

goto mandos_end;

767

729

}

768

730

776

738

while(true){

777

739

778

740

if(quit_now){

779

errno = EINTR;

780

741

goto mandos_end;

781

742

}

782

743

783

744

buffer_capacity = incbuffer(&buffer, buffer_length,

784

745

buffer_capacity);

785

746

if(buffer_capacity == 0){

786

int e = errno;

787

747

perror("incbuffer");

788

errno = e;

748

retval = -1;

789

749

goto mandos_end;

790

750

}

791

751

792

752

if(quit_now){

793

errno = EINTR;

794

753

goto mandos_end;

795

754

}

796

755

805

764

case GNUTLS_E_AGAIN:

806

765

break;

807

766

case GNUTLS_E_REHANDSHAKE:

808

do {

767

do{

809

768

ret = gnutls_handshake(session);

810

769

811

770

if(quit_now){

812

errno = EINTR;

813

771

goto mandos_end;

814

772

}

815

773

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

816

774

if(ret < 0){

817

775

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

818

776

gnutls_perror(ret);

819

errno = EPROTO;

777

retval = -1;

820

778

goto mandos_end;

821

779

}

822

780

break;

823

781

default:

824

782

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

825

783

" encrypted session with Mandos server\n");

784

retval = -1;

826

785

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

786

goto mandos_end;

829

787

}

830

788

} else {

837

795

}

838

796

839

797

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

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

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

851

806

852

807

if(buffer_length > 0){

853

ssize_t decrypted_buffer_size;

854

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

809

buffer_length,

856

810

&decrypted_buffer);

857

811

if(decrypted_buffer_size >= 0){

858

859

812

written = 0;

860

813

while(written < (size_t) decrypted_buffer_size){

861

814

if(quit_now){

862

errno = EINTR;

863

815

goto mandos_end;

864

816

}

865

817

867

819

(size_t)decrypted_buffer_size - written,

868

820

stdout);

869

821

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

870

int e = errno;

871

822

if(debug){

872

823

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

873

824

strerror(errno));

874

825

}

875

errno = e;

876

goto mandos_end;

826

retval = -1;

827

break;

877

828

}

878

829

written += (size_t)ret;

879

830

}

880

retval = 0;

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

881

834

}

835

} else {

836

retval = -1;

882

837

}

883

838

884

839

/* Shutdown procedure */

885

840

886

841

mandos_end:

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

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

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

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;

906

852

}

907

853

return retval;

908

854

}

1024

970

errno = old_errno;

1025

971

}

1026

972

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

1122

973

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

1123

974

AvahiSServiceBrowser *sb = NULL;

1124

975

int error;

1126

977

intmax_t tmpmax;

1127

978

char *tmp;

1128

979

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

980

const char *interface = "eth0";

1130

981

struct ifreq network;

1131

982

int sd = -1;

1132

983

bool take_down_interface = false;

1133

984

uid_t uid;

1134

985

gid_t gid;

986

char *connect_to = NULL;

1135

987

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

1136

988

bool tempdir_created = false;

1137

989

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1142

994

bool gpgme_initialized = false;

1143

995

float delay = 2.5f;

1144

996

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

997

struct sigaction old_sigterm_action;

1146

998

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1147

999

1148

uid = getuid();

1149

gid = getgid();

1150

1151

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

1152

errno = 0;

1153

ret = setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

/* Lower user privileges (temporarily) */

1159

errno = 0;

1160

ret = seteuid(uid);

1161

if(ret == -1){

1162

perror("seteuid");

1163

}

1164

1165

if(quit_now){

1166

goto end;

1167

}

1168

1169

1000

{

1170

1001

struct argp_option options[] = {

1171

1002

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

1200

1031

.arg = "SECONDS",

1201

1032

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

1202

1033

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

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

1207

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

1208

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

1209

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

1210

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

1211

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

1212

1034

{ .name = NULL }

1213

1035

};

1214

1036

1215

1037

error_t parse_opt(int key, char *arg,

1216

1038

struct argp_state *state){

1217

errno = 0;

1218

1039

switch(key){

1219

1040

case 128: /* --debug */

1220

1041

debug = true;

1236

1057

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

1237

1058

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

1238

1059

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

1239

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

1060

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

1061

exit(EXIT_FAILURE);

1240

1062

}

1241

1063

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

1242

1064

break;

1247

1069

errno = 0;

1248

1070

delay = strtof(arg, &tmp);

1249

1071

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

1250

argp_error(state, "Bad delay");

1072

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

1073

exit(EXIT_FAILURE);

1251

1074

}

1252

1075

break;

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

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

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

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

1264

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

1265

exit(argp_err_exit_status);

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1266

1079

break;

1267

1080

default:

1268

1081

return ARGP_ERR_UNKNOWN;

1269

1082

}

1270

return errno;

1083

return 0;

1271

1084

}

1272

1085

1273

1086

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

1274

1087

.args_doc = "",

1275

1088

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

1276

1089

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

exitcode = EX_USAGE;

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;

1290

1094

goto end;

1291

1095

}

1292

1096

}

1294

1098

if(not debug){

1295

1099

avahi_set_log_function(empty_log);

1296

1100

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

1101

1323

1102

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

1324

1103

from the signal handler */

1327

1106

mc.simple_poll = avahi_simple_poll_new();

1328

1107

if(mc.simple_poll == NULL){

1329

1108

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

1330

exitcode = EX_UNAVAILABLE;

1109

exitcode = EXIT_FAILURE;

1331

1110

goto end;

1332

1111

}

1333

1112

1335

1114

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

1336

1115

if(ret == -1){

1337

1116

perror("sigaddset");

1338

exitcode = EX_OSERR;

1117

exitcode = EXIT_FAILURE;

1339

1118

goto end;

1340

1119

}

1341

1120

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

1342

1121

if(ret == -1){

1343

1122

perror("sigaddset");

1344

exitcode = EX_OSERR;

1123

exitcode = EXIT_FAILURE;

1345

1124

goto end;

1346

1125

}

1347

1126

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

1348

1127

if(ret == -1){

1349

1128

perror("sigaddset");

1350

exitcode = EX_OSERR;

1129

exitcode = EXIT_FAILURE;

1351

1130

goto end;

1352

1131

}

1353

1132

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

1357

1136

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

1358

1137

if(ret == -1){

1359

1138

perror("sigaction");

1360

return EX_OSERR;

1139

return EXIT_FAILURE;

1361

1140

}

1362

1141

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1142

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

1364

1143

if(ret == -1){

1365

1144

perror("sigaction");

1366

exitcode = EX_OSERR;

1145

exitcode = EXIT_FAILURE;

1367

1146

goto end;

1368

1147

}

1369

1148

}

1370

1149

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

1371

1150

if(ret == -1){

1372

1151

perror("sigaction");

1373

return EX_OSERR;

1152

return EXIT_FAILURE;

1374

1153

}

1375

1154

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1155

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

1377

1156

if(ret == -1){

1378

1157

perror("sigaction");

1379

exitcode = EX_OSERR;

1158

exitcode = EXIT_FAILURE;

1380

1159

goto end;

1381

1160

}

1382

1161

}

1383

1162

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

1384

1163

if(ret == -1){

1385

1164

perror("sigaction");

1386

return EX_OSERR;

1165

return EXIT_FAILURE;

1387

1166

}

1388

1167

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1168

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

1390

1169

if(ret == -1){

1391

1170

perror("sigaction");

1392

exitcode = EX_OSERR;

1171

exitcode = EXIT_FAILURE;

1393

1172

goto end;

1394

1173

}

1395

1174

}

1396

1175

1397

1176

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

1398

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

1177

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

1399

1178

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1179

if(if_index == 0){

1401

1180

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

1402

exitcode = EX_UNAVAILABLE;

1181

exitcode = EXIT_FAILURE;

1403

1182

goto end;

1404

1183

}

1405

1184

1407

1186

goto end;

1408

1187

}

1409

1188

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

1189

#ifdef __linux__

1418

1190

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1191

messages to mess up the prompt */

1420

1192

ret = klogctl(8, NULL, 5);

1421

1193

bool restore_loglevel = true;

1422

1194

if(ret == -1){

1428

1200

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1201

if(sd < 0){

1430

1202

perror("socket");

1431

exitcode = EX_OSERR;

1203

exitcode = EXIT_FAILURE;

1432

1204

#ifdef __linux__

1433

1205

if(restore_loglevel){

1434

1206

ret = klogctl(7, NULL, 0);

1437

1209

}

1438

1210

}

1439

1211

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

1212

goto end;

1447

1213

}

1448

1214

strcpy(network.ifr_name, interface);

1457

1223

}

1458

1224

}

1459

1225

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1226

exitcode = EXIT_FAILURE;

1467

1227

goto end;

1468

1228

}

1469

1229

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

1472

1232

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

1473

1233

if(ret == -1){

1474

1234

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1477

1237

#ifdef __linux__

1478

1238

if(restore_loglevel){

1479

1239

ret = klogctl(7, NULL, 0);

1482

1242

}

1483

1243

}

1484

1244

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

1245

goto end;

1492

1246

}

1493

1247

}

1521

1275

}

1522

1276

}

1523

1277

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

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");

1539

1296

}

1540

1297

1541

1298

if(quit_now){

1545

1302

ret = init_gnutls_global(pubkey, seckey);

1546

1303

if(ret == -1){

1547

1304

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

1548

exitcode = EX_UNAVAILABLE;

1305

exitcode = EXIT_FAILURE;

1549

1306

goto end;

1550

1307

} else {

1551

1308

gnutls_initialized = true;

1568

1325

1569

1326

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

1570

1327

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

1571

exitcode = EX_UNAVAILABLE;

1328

exitcode = EXIT_FAILURE;

1572

1329

goto end;

1573

1330

} else {

1574

1331

gpgme_initialized = true;

1584

1341

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

1585

1342

if(address == NULL){

1586

1343

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

1587

exitcode = EX_USAGE;

1344

exitcode = EXIT_FAILURE;

1588

1345

goto end;

1589

1346

}

1590

1347

1598

1355

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

1599

1356

or tmpmax != (uint16_t)tmpmax){

1600

1357

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

1601

exitcode = EX_USAGE;

1358

exitcode = EXIT_FAILURE;

1602

1359

goto end;

1603

1360

}

1604

1361

1620

1377

if(quit_now){

1621

1378

goto end;

1622

1379

}

1623

1624

while(not quit_now){

1625

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

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

1380

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} else {

1633

1385

exitcode = EXIT_SUCCESS;

1634

1386

}

1635

1636

1387

goto end;

1637

1388

}

1638

1389

1662

1413

if(mc.server == NULL){

1663

1414

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

1664

1415

avahi_strerror(error));

1665

exitcode = EX_UNAVAILABLE;

1416

exitcode = EXIT_FAILURE;

1666

1417

goto end;

1667

1418

}

1668

1419

1677

1428

if(sb == NULL){

1678

1429

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

1679

1430

avahi_strerror(avahi_server_errno(mc.server)));

1680

exitcode = EX_UNAVAILABLE;

1431

exitcode = EXIT_FAILURE;

1681

1432

goto end;

1682

1433

}

1683

1434

1721

1472

1722

1473

/* Take down the network interface */

1723

1474

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1475

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

1727

1476

if(ret == -1){

1728

perror("seteuid");

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

}

1729

1484

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1751

1488

}

1752

1489

}

1753

1490

1798

1535

if(quit_now){

1799

1536

sigemptyset(&old_sigterm_action.sa_mask);

1800

1537

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1538

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

1804

1539

if(ret == -1){

1805

1540

perror("sigaction");

1806

1541

}

1807

do {

1808

ret = raise(signal_received);

1809

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

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1542

raise(signal_received);

1815

1543

}

1816

1544

1817

1545

return exitcode;