/mandos/release : revision 24.1.141

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

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,

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;

554

534

size_t written;

555

int retval = -1;

535

int retval = 0;

556

536

gnutls_session_t session;

557

537

int pf; /* Protocol family */

558

538

559

errno = 0;

560

561

539

if(quit_now){

562

errno = EINTR;

563

540

return -1;

564

541

}

565

542

572

549

break;

573

550

default:

574

551

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

575

errno = EINVAL;

576

552

return -1;

577

553

}

578

554

588

564

589

565

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

566

if(tcp_sd < 0){

591

int e = errno;

592

567

perror("socket");

593

errno = e;

568

retval = -1;

594

569

goto mandos_end;

595

570

}

596

571

597

572

if(quit_now){

598

errno = EINTR;

599

573

goto mandos_end;

600

574

}

601

575

608

582

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

609

583

}

610

584

if(ret < 0 ){

611

int e = errno;

612

585

perror("inet_pton");

613

errno = e;

586

retval = -1;

614

587

goto mandos_end;

615

588

}

616

589

if(ret == 0){

617

int e = errno;

618

590

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

619

errno = e;

591

retval = -1;

620

592

goto mandos_end;

621

593

}

622

594

if(af == AF_INET6){

630

602

if(if_index == AVAHI_IF_UNSPEC){

631

603

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

632

604

" without a network interface\n");

633

errno = EINVAL;

605

retval = -1;

634

606

goto mandos_end;

635

607

}

636

608

/* Set the network interface number as scope */

643

615

}

644

616

645

617

if(quit_now){

646

errno = EINTR;

647

618

goto mandos_end;

648

619

}

649

620

680

651

}

681

652

682

653

if(quit_now){

683

errno = EINTR;

684

654

goto mandos_end;

685

655

}

686

656

690

660

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

691

661

}

692

662

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

663

perror("connect");

664

retval = -1;

698

665

goto mandos_end;

699

666

}

700

667

701

668

if(quit_now){

702

errno = EINTR;

703

669

goto mandos_end;

704

670

}

705

671

710

676

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

711

677

out_size - written));

712

678

if(ret == -1){

713

int e = errno;

714

679

perror("write");

715

errno = e;

680

retval = -1;

716

681

goto mandos_end;

717

682

}

718

683

written += (size_t)ret;

728

693

}

729

694

730

695

if(quit_now){

731

errno = EINTR;

732

696

goto mandos_end;

733

697

}

734

698

}

738

702

}

739

703

740

704

if(quit_now){

741

errno = EINTR;

742

705

goto mandos_end;

743

706

}

744

707

745

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

709

747

710

if(quit_now){

748

errno = EINTR;

749

711

goto mandos_end;

750

712

}

751

713

752

714

do {

753

715

ret = gnutls_handshake(session);

754

716

if(quit_now){

755

errno = EINTR;

756

717

goto mandos_end;

757

718

}

758

719

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

762

723

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

763

724

gnutls_perror(ret);

764

725

}

765

errno = EPROTO;

726

retval = -1;

766

727

goto mandos_end;

767

728

}

768

729

776

737

while(true){

777

738

778

739

if(quit_now){

779

errno = EINTR;

780

740

goto mandos_end;

781

741

}

782

742

783

743

buffer_capacity = incbuffer(&buffer, buffer_length,

784

744

buffer_capacity);

785

745

if(buffer_capacity == 0){

786

int e = errno;

787

746

perror("incbuffer");

788

errno = e;

747

retval = -1;

789

748

goto mandos_end;

790

749

}

791

750

792

751

if(quit_now){

793

errno = EINTR;

794

752

goto mandos_end;

795

753

}

796

754

809

767

ret = gnutls_handshake(session);

810

768

811

769

if(quit_now){

812

errno = EINTR;

813

770

goto mandos_end;

814

771

}

815

772

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

816

773

if(ret < 0){

817

774

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

818

775

gnutls_perror(ret);

819

errno = EPROTO;

776

retval = -1;

820

777

goto mandos_end;

821

778

}

822

779

break;

823

780

default:

824

781

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

825

782

" encrypted session with Mandos server\n");

783

retval = -1;

826

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

785

goto mandos_end;

829

786

}

830

787

} else {

837

794

}

838

795

839

796

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);

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

851

805

852

806

if(buffer_length > 0){

853

807

ssize_t decrypted_buffer_size;

859

813

written = 0;

860

814

while(written < (size_t) decrypted_buffer_size){

861

815

if(quit_now){

862

errno = EINTR;

863

816

goto mandos_end;

864

817

}

865

818

867

820

(size_t)decrypted_buffer_size - written,

868

821

stdout);

869

822

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

870

int e = errno;

871

823

if(debug){

872

824

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

873

825

strerror(errno));

874

826

}

875

errno = e;

876

goto mandos_end;

827

retval = -1;

828

break;

877

829

}

878

830

written += (size_t)ret;

879

831

}

880

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

881

835

}

836

} else {

837

retval = -1;

882

838

}

883

839

884

840

/* Shutdown procedure */

885

841

886

842

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;

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

906

853

}

907

854

return retval;

908

855

}

1024

971

errno = old_errno;

1025

972

}

1026

973

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

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

1036

return 0;

1037

}

1038

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

1039

if_entry->d_name);

1040

if(ret < 0){

1041

perror("asprintf");

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

free(flagname);

1048

return 0;

1049

}

1050

free(flagname);

1051

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

1052

/* read line from flags_fd */

1053

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

1054

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

1055

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

1056

if(flagstring == NULL){

1057

perror("malloc");

1058

close(flags_fd);

1059

return 0;

1060

}

1061

while(to_read > 0){

1062

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

1063

(size_t)to_read));

1064

if(ssret == -1){

1065

perror("read");

1066

free(flagstring);

1067

close(flags_fd);

1068

return 0;

1069

}

1070

to_read -= ssret;

1071

if(ssret == 0){

1072

break;

1073

}

1074

}

1075

close(flags_fd);

1076

intmax_t tmpmax;

1077

char *tmp;

1078

errno = 0;

1079

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

1080

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

1081

and not (isspace(*tmp)))

1082

or tmpmax != (ifreq_flags)tmpmax){

1083

if(debug){

1084

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

1085

flagstring, if_entry->d_name);

1086

}

1087

free(flagstring);

1088

return 0;

1089

}

1090

free(flagstring);

1091

ifreq_flags flags = (ifreq_flags)tmpmax;

1092

/* Reject the loopback device */

1093

if(flags & IFF_LOOPBACK){

1094

if(debug){

1095

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

1096

if_entry->d_name);

1097

}

1098

return 0;

1099

}

1100

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

1101

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

1102

if(debug){

1103

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

1104

if_entry->d_name);

1105

}

1106

return 1;

1107

}

1108

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

1109

if(not (flags & IFF_BROADCAST)){

1110

if(debug){

1111

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

1112

if_entry->d_name);

1113

}

1114

return 0;

1115

}

1116

/* Accept this device */

1117

if(debug){

1118

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

1119

if_entry->d_name);

1120

}

1121

return 1;

1122

}

1123

1124

974

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

1125

975

AvahiSServiceBrowser *sb = NULL;

1126

976

int error;

1128

978

intmax_t tmpmax;

1129

979

char *tmp;

1130

980

int exitcode = EXIT_SUCCESS;

1131

const char *interface = "";

981

const char *interface = "eth0";

1132

982

struct ifreq network;

1133

983

int sd = -1;

1134

984

bool take_down_interface = false;

1135

985

uid_t uid;

1136

986

gid_t gid;

987

char *connect_to = NULL;

1137

988

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

1138

989

bool tempdir_created = false;

1139

990

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1144

995

bool gpgme_initialized = false;

1145

996

float delay = 2.5f;

1146

997

1147

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1148

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1149

1000

1150

uid = getuid();

1151

gid = getgid();

1152

1153

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

1154

errno = 0;

1155

ret = setgid(gid);

1156

if(ret == -1){

1157

perror("setgid");

1158

}

1159

1160

/* Lower user privileges (temporarily) */

1161

errno = 0;

1162

ret = seteuid(uid);

1163

if(ret == -1){

1164

perror("seteuid");

1165

}

1166

1167

if(quit_now){

1168

goto end;

1169

}

1170

1171

1001

{

1172

1002

struct argp_option options[] = {

1173

1003

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

1202

1032

.arg = "SECONDS",

1203

1033

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

1204

1034

.group = 2 },

1205

/*

1206

* These reproduce what we would get without ARGP_NO_HELP

1207

*/

1208

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

1209

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

1210

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

1211

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

1212

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

1213

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

1214

1035

{ .name = NULL }

1215

1036

};

1216

1037

1217

1038

error_t parse_opt(int key, char *arg,

1218

1039

struct argp_state *state){

1219

errno = 0;

1220

1040

switch(key){

1221

1041

case 128: /* --debug */

1222

1042

debug = true;

1238

1058

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

1239

1059

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

1240

1060

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

1241

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

1061

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

1062

exit(EXIT_FAILURE);

1242

1063

}

1243

1064

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

1244

1065

break;

1249

1070

errno = 0;

1250

1071

delay = strtof(arg, &tmp);

1251

1072

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

1252

argp_error(state, "Bad delay");

1073

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

1074

exit(EXIT_FAILURE);

1253

1075

}

1254

1076

break;

1255

/*

1256

* These reproduce what we would get without ARGP_NO_HELP

1257

*/

1258

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

1259

argp_state_help(state, state->out_stream,

1260

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1261

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1262

case -3: /* --usage */

1263

argp_state_help(state, state->out_stream,

1264

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1265

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

1266

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

1267

exit(argp_err_exit_status);

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1268

1080

break;

1269

1081

default:

1270

1082

return ARGP_ERR_UNKNOWN;

1271

1083

}

1272

return errno;

1084

return 0;

1273

1085

}

1274

1086

1275

1087

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

1276

1088

.args_doc = "",

1277

1089

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

1278

1090

" passwords from a Mandos server" };

1279

ret = argp_parse(&argp, argc, argv,

1280

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1281

switch(ret){

1282

case 0:

1283

break;

1284

case ENOMEM:

1285

default:

1286

errno = ret;

1287

perror("argp_parse");

1288

exitcode = EX_OSERR;

1289

goto end;

1290

case EINVAL:

1291

exitcode = EX_USAGE;

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1292

1095

goto end;

1293

1096

}

1294

1097

}

1296

1099

if(not debug){

1297

1100

avahi_set_log_function(empty_log);

1298

1101

}

1299

1300

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

1301

struct dirent **direntries;

1302

ret = scandir(sys_class_net, &direntries, good_interface,

1303

alphasort);

1304

if(ret >= 1){

1305

/* Pick the first good interface */

1306

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

1307

if(debug){

1308

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

1309

}

1310

if(interface == NULL){

1311

perror("malloc");

1312

free(direntries);

1313

exitcode = EXIT_FAILURE;

1314

goto end;

1315

}

1316

free(direntries);

1317

} else {

1318

free(direntries);

1319

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

1320

exitcode = EXIT_FAILURE;

1321

goto end;

1322

}

1323

}

1324

1102

1325

1103

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

1326

1104

from the signal handler */

1329

1107

mc.simple_poll = avahi_simple_poll_new();

1330

1108

if(mc.simple_poll == NULL){

1331

1109

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

1332

exitcode = EX_UNAVAILABLE;

1110

exitcode = EXIT_FAILURE;

1333

1111

goto end;

1334

1112

}

1335

1113

1337

1115

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

1338

1116

if(ret == -1){

1339

1117

perror("sigaddset");

1340

exitcode = EX_OSERR;

1118

exitcode = EXIT_FAILURE;

1341

1119

goto end;

1342

1120

}

1343

1121

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

1344

1122

if(ret == -1){

1345

1123

perror("sigaddset");

1346

exitcode = EX_OSERR;

1124

exitcode = EXIT_FAILURE;

1347

1125

goto end;

1348

1126

}

1349

1127

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

1350

1128

if(ret == -1){

1351

1129

perror("sigaddset");

1352

exitcode = EX_OSERR;

1130

exitcode = EXIT_FAILURE;

1353

1131

goto end;

1354

1132

}

1355

1133

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

1359

1137

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

1360

1138

if(ret == -1){

1361

1139

perror("sigaction");

1362

return EX_OSERR;

1140

return EXIT_FAILURE;

1363

1141

}

1364

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1365

1143

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

1366

1144

if(ret == -1){

1367

1145

perror("sigaction");

1368

exitcode = EX_OSERR;

1146

exitcode = EXIT_FAILURE;

1369

1147

goto end;

1370

1148

}

1371

1149

}

1372

1150

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

1373

1151

if(ret == -1){

1374

1152

perror("sigaction");

1375

return EX_OSERR;

1153

return EXIT_FAILURE;

1376

1154

}

1377

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1378

1156

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

1379

1157

if(ret == -1){

1380

1158

perror("sigaction");

1381

exitcode = EX_OSERR;

1159

exitcode = EXIT_FAILURE;

1382

1160

goto end;

1383

1161

}

1384

1162

}

1385

1163

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

1386

1164

if(ret == -1){

1387

1165

perror("sigaction");

1388

return EX_OSERR;

1166

return EXIT_FAILURE;

1389

1167

}

1390

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1391

1169

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

1392

1170

if(ret == -1){

1393

1171

perror("sigaction");

1394

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1395

1173

goto end;

1396

1174

}

1397

1175

}

1398

1176

1399

1177

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

1400

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

1178

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

1401

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1402

1180

if(if_index == 0){

1403

1181

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

1404

exitcode = EX_UNAVAILABLE;

1182

exitcode = EXIT_FAILURE;

1405

1183

goto end;

1406

1184

}

1407

1185

1409

1187

goto end;

1410

1188

}

1411

1189

1412

/* Re-raise priviliges */

1413

errno = 0;

1414

ret = seteuid(0);

1415

if(ret == -1){

1416

perror("seteuid");

1417

}

1418

1419

1190

#ifdef __linux__

1420

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1421

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

1192

messages to mess up the prompt */

1422

1193

ret = klogctl(8, NULL, 5);

1423

1194

bool restore_loglevel = true;

1424

1195

if(ret == -1){

1430

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1431

1202

if(sd < 0){

1432

1203

perror("socket");

1433

exitcode = EX_OSERR;

1204

exitcode = EXIT_FAILURE;

1434

1205

#ifdef __linux__

1435

1206

if(restore_loglevel){

1436

1207

ret = klogctl(7, NULL, 0);

1439

1210

}

1440

1211

}

1441

1212

#endif /* __linux__ */

1442

/* Lower privileges */

1443

errno = 0;

1444

ret = seteuid(uid);

1445

if(ret == -1){

1446

perror("seteuid");

1447

}

1448

1213

goto end;

1449

1214

}

1450

1215

strcpy(network.ifr_name, interface);

1459

1224

}

1460

1225

}

1461

1226

#endif /* __linux__ */

1462

exitcode = EX_OSERR;

1463

/* Lower privileges */

1464

errno = 0;

1465

ret = seteuid(uid);

1466

if(ret == -1){

1467

perror("seteuid");

1468

}

1227

exitcode = EXIT_FAILURE;

1469

1228

goto end;

1470

1229

}

1471

1230

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

1474

1233

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

1475

1234

if(ret == -1){

1476

1235

take_down_interface = false;

1477

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1478

exitcode = EX_OSERR;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1479

1238

#ifdef __linux__

1480

1239

if(restore_loglevel){

1481

1240

ret = klogctl(7, NULL, 0);

1484

1243

}

1485

1244

}

1486

1245

#endif /* __linux__ */

1487

/* Lower privileges */

1488

errno = 0;

1489

ret = seteuid(uid);

1490

if(ret == -1){

1491

perror("seteuid");

1492

}

1493

1246

goto end;

1494

1247

}

1495

1248

}

1523

1276

}

1524

1277

}

1525

1278

#endif /* __linux__ */

1526

/* Lower privileges */

1527

errno = 0;

1528

if(take_down_interface){

1529

/* Lower privileges */

1530

ret = seteuid(uid);

1531

if(ret == -1){

1532

perror("seteuid");

1533

}

1534

} else {

1535

/* Lower privileges permanently */

1536

ret = setuid(uid);

1537

if(ret == -1){

1538

perror("setuid");

1539

}

1540

}

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

1541

1297

}

1542

1298

1543

1299

if(quit_now){

1547

1303

ret = init_gnutls_global(pubkey, seckey);

1548

1304

if(ret == -1){

1549

1305

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

1550

exitcode = EX_UNAVAILABLE;

1306

exitcode = EXIT_FAILURE;

1551

1307

goto end;

1552

1308

} else {

1553

1309

gnutls_initialized = true;

1570

1326

1571

1327

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

1572

1328

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

1573

exitcode = EX_UNAVAILABLE;

1329

exitcode = EXIT_FAILURE;

1574

1330

goto end;

1575

1331

} else {

1576

1332

gpgme_initialized = true;

1586

1342

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

1587

1343

if(address == NULL){

1588

1344

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

1589

exitcode = EX_USAGE;

1345

exitcode = EXIT_FAILURE;

1590

1346

goto end;

1591

1347

}

1592

1348

1600

1356

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

1601

1357

or tmpmax != (uint16_t)tmpmax){

1602

1358

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

1603

exitcode = EX_USAGE;

1359

exitcode = EXIT_FAILURE;

1604

1360

goto end;

1605

1361

}

1606

1362

1622

1378

if(quit_now){

1623

1379

goto end;

1624

1380

}

1625

1626

while(not quit_now){

1627

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

1628

if(quit_now or ret == 0){

1629

break;

1630

}

1631

sleep(15);

1632

};

1633

1634

if (not quit_now){

1381

1382

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

1383

if(ret < 0){

1384

exitcode = EXIT_FAILURE;

1385

} else {

1635

1386

exitcode = EXIT_SUCCESS;

1636

1387

}

1637

1638

1388

goto end;

1639

1389

}

1640

1390

1664

1414

if(mc.server == NULL){

1665

1415

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

1666

1416

avahi_strerror(error));

1667

exitcode = EX_UNAVAILABLE;

1417

exitcode = EXIT_FAILURE;

1668

1418

goto end;

1669

1419

}

1670

1420

1679

1429

if(sb == NULL){

1680

1430

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

1681

1431

avahi_strerror(avahi_server_errno(mc.server)));

1682

exitcode = EX_UNAVAILABLE;

1432

exitcode = EXIT_FAILURE;

1683

1433

goto end;

1684

1434

}

1685

1435

1723

1473

1724

1474

/* Take down the network interface */

1725

1475

if(take_down_interface){

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1476

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

1729

1477

if(ret == -1){

1730

perror("seteuid");

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1731

1485

}

1732

if(geteuid() == 0){

1733

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

1734

if(ret == -1){

1735

perror("ioctl SIOCGIFFLAGS");

1736

} else if(network.ifr_flags & IFF_UP) {

1737

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

1738

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

1739

if(ret == -1){

1740

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1741

}

1742

}

1743

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

1744

if(ret == -1){

1745

perror("close");

1746

}

1747

/* Lower privileges permanently */

1748

errno = 0;

1749

ret = setuid(uid);

1750

if(ret == -1){

1751

perror("setuid");

1752

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1753

1489

}

1754

1490

}

1755

1491

1800

1536

if(quit_now){

1801

1537

sigemptyset(&old_sigterm_action.sa_mask);

1802

1538

old_sigterm_action.sa_handler = SIG_DFL;

1803

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1804

&old_sigterm_action,

1805

NULL));

1539

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

1806

1540

if(ret == -1){

1807

1541

perror("sigaction");

1808

1542

}

1809

do {

1810

ret = raise(signal_received);

1811

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

1812

if(ret != 0){

1813

perror("raise");

1814

abort();

1815

}

1816

TEMP_FAILURE_RETRY(pause());

1543

raise(signal_received);

1817

1544

}

1818

1545

1819

1546

return exitcode;