/mandos/release : revision 24.1.141

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() */

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

int e = errno;

694

663

perror("connect");

695

errno = e;

664

retval = -1;

696

665

goto mandos_end;

697

666

}

698

667

699

668

if(quit_now){

700

errno = EINTR;

701

669

goto mandos_end;

702

670

}

703

671

708

676

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

709

677

out_size - written));

710

678

if(ret == -1){

711

int e = errno;

712

679

perror("write");

713

errno = e;

680

retval = -1;

714

681

goto mandos_end;

715

682

}

716

683

written += (size_t)ret;

726

693

}

727

694

728

695

if(quit_now){

729

errno = EINTR;

730

696

goto mandos_end;

731

697

}

732

698

}

736

702

}

737

703

738

704

if(quit_now){

739

errno = EINTR;

740

705

goto mandos_end;

741

706

}

742

707

743

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

744

709

745

710

if(quit_now){

746

errno = EINTR;

747

711

goto mandos_end;

748

712

}

749

713

750

714

do {

751

715

ret = gnutls_handshake(session);

752

716

if(quit_now){

753

errno = EINTR;

754

717

goto mandos_end;

755

718

}

756

719

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

760

723

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

761

724

gnutls_perror(ret);

762

725

}

763

errno = EPROTO;

726

retval = -1;

764

727

goto mandos_end;

765

728

}

766

729

774

737

while(true){

775

738

776

739

if(quit_now){

777

errno = EINTR;

778

740

goto mandos_end;

779

741

}

780

742

781

743

buffer_capacity = incbuffer(&buffer, buffer_length,

782

744

buffer_capacity);

783

745

if(buffer_capacity == 0){

784

int e = errno;

785

746

perror("incbuffer");

786

errno = e;

747

retval = -1;

787

748

goto mandos_end;

788

749

}

789

750

790

751

if(quit_now){

791

errno = EINTR;

792

752

goto mandos_end;

793

753

}

794

754

807

767

ret = gnutls_handshake(session);

808

768

809

769

if(quit_now){

810

errno = EINTR;

811

770

goto mandos_end;

812

771

}

813

772

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

814

773

if(ret < 0){

815

774

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

816

775

gnutls_perror(ret);

817

errno = EPROTO;

776

retval = -1;

818

777

goto mandos_end;

819

778

}

820

779

break;

821

780

default:

822

781

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

823

782

" encrypted session with Mandos server\n");

783

retval = -1;

824

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

826

785

goto mandos_end;

827

786

}

828

787

} else {

835

794

}

836

795

837

796

if(quit_now){

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);

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

849

805

850

806

if(buffer_length > 0){

851

807

ssize_t decrypted_buffer_size;

857

813

written = 0;

858

814

while(written < (size_t) decrypted_buffer_size){

859

815

if(quit_now){

860

errno = EINTR;

861

816

goto mandos_end;

862

817

}

863

818

865

820

(size_t)decrypted_buffer_size - written,

866

821

stdout);

867

822

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

868

int e = errno;

869

823

if(debug){

870

824

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

871

825

strerror(errno));

872

826

}

873

errno = e;

874

goto mandos_end;

827

retval = -1;

828

break;

875

829

}

876

830

written += (size_t)ret;

877

831

}

878

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

879

835

}

836

} else {

837

retval = -1;

880

838

}

881

839

882

840

/* Shutdown procedure */

883

841

884

842

mandos_end:

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;

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;

904

853

}

905

854

return retval;

906

855

}

1022

971

errno = old_errno;

1023

972

}

1024

973

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

1120

974

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

1121

975

AvahiSServiceBrowser *sb = NULL;

1122

976

int error;

1124

978

intmax_t tmpmax;

1125

979

char *tmp;

1126

980

int exitcode = EXIT_SUCCESS;

1127

const char *interface = "";

981

const char *interface = "eth0";

1128

982

struct ifreq network;

1129

983

int sd = -1;

1130

984

bool take_down_interface = false;

1131

985

uid_t uid;

1132

986

gid_t gid;

987

char *connect_to = NULL;

1133

988

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

1134

989

bool tempdir_created = false;

1135

990

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1140

995

bool gpgme_initialized = false;

1141

996

float delay = 2.5f;

1142

997

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1144

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1145

1000

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

1167

1001

{

1168

1002

struct argp_option options[] = {

1169

1003

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

1198

1032

.arg = "SECONDS",

1199

1033

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

1200

1034

.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 },

1210

1035

{ .name = NULL }

1211

1036

};

1212

1037

1213

1038

error_t parse_opt(int key, char *arg,

1214

1039

struct argp_state *state){

1215

errno = 0;

1216

1040

switch(key){

1217

1041

case 128: /* --debug */

1218

1042

debug = true;

1234

1058

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

1235

1059

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

1236

1060

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

1237

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

1061

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

1062

exit(EXIT_FAILURE);

1238

1063

}

1239

1064

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

1240

1065

break;

1245

1070

errno = 0;

1246

1071

delay = strtof(arg, &tmp);

1247

1072

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

1248

argp_error(state, "Bad delay");

1073

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

1074

exit(EXIT_FAILURE);

1249

1075

}

1250

1076

break;

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);

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1264

1080

break;

1265

1081

default:

1266

1082

return ARGP_ERR_UNKNOWN;

1267

1083

}

1268

return errno;

1084

return 0;

1269

1085

}

1270

1086

1271

1087

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

1272

1088

.args_doc = "",

1273

1089

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

1274

1090

" passwords from a Mandos server" };

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;

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;

1288

1095

goto end;

1289

1096

}

1290

1097

}

1292

1099

if(not debug){

1293

1100

avahi_set_log_function(empty_log);

1294

1101

}

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

}

1320

1102

1321

1103

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

1322

1104

from the signal handler */

1325

1107

mc.simple_poll = avahi_simple_poll_new();

1326

1108

if(mc.simple_poll == NULL){

1327

1109

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

1328

exitcode = EX_UNAVAILABLE;

1110

exitcode = EXIT_FAILURE;

1329

1111

goto end;

1330

1112

}

1331

1113

1333

1115

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

1334

1116

if(ret == -1){

1335

1117

perror("sigaddset");

1336

exitcode = EX_OSERR;

1118

exitcode = EXIT_FAILURE;

1337

1119

goto end;

1338

1120

}

1339

1121

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

1340

1122

if(ret == -1){

1341

1123

perror("sigaddset");

1342

exitcode = EX_OSERR;

1124

exitcode = EXIT_FAILURE;

1343

1125

goto end;

1344

1126

}

1345

1127

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

1346

1128

if(ret == -1){

1347

1129

perror("sigaddset");

1348

exitcode = EX_OSERR;

1130

exitcode = EXIT_FAILURE;

1349

1131

goto end;

1350

1132

}

1351

1133

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

1355

1137

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

1356

1138

if(ret == -1){

1357

1139

perror("sigaction");

1358

return EX_OSERR;

1140

return EXIT_FAILURE;

1359

1141

}

1360

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

1143

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

1362

1144

if(ret == -1){

1363

1145

perror("sigaction");

1364

exitcode = EX_OSERR;

1146

exitcode = EXIT_FAILURE;

1365

1147

goto end;

1366

1148

}

1367

1149

}

1368

1150

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

1369

1151

if(ret == -1){

1370

1152

perror("sigaction");

1371

return EX_OSERR;

1153

return EXIT_FAILURE;

1372

1154

}

1373

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

1156

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

1375

1157

if(ret == -1){

1376

1158

perror("sigaction");

1377

exitcode = EX_OSERR;

1159

exitcode = EXIT_FAILURE;

1378

1160

goto end;

1379

1161

}

1380

1162

}

1381

1163

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

1382

1164

if(ret == -1){

1383

1165

perror("sigaction");

1384

return EX_OSERR;

1166

return EXIT_FAILURE;

1385

1167

}

1386

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

1169

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

1388

1170

if(ret == -1){

1389

1171

perror("sigaction");

1390

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1391

1173

goto end;

1392

1174

}

1393

1175

}

1394

1176

1395

1177

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

1396

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

1178

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

1397

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

1180

if(if_index == 0){

1399

1181

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

1400

exitcode = EX_UNAVAILABLE;

1182

exitcode = EXIT_FAILURE;

1401

1183

goto end;

1402

1184

}

1403

1185

1405

1187

goto end;

1406

1188

}

1407

1189

1408

/* Re-raise priviliges */

1409

errno = 0;

1410

ret = seteuid(0);

1411

if(ret == -1){

1412

perror("seteuid");

1413

}

1414

1415

1190

#ifdef __linux__

1416

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1417

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

1192

messages to mess up the prompt */

1418

1193

ret = klogctl(8, NULL, 5);

1419

1194

bool restore_loglevel = true;

1420

1195

if(ret == -1){

1426

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1427

1202

if(sd < 0){

1428

1203

perror("socket");

1429

exitcode = EX_OSERR;

1204

exitcode = EXIT_FAILURE;

1430

1205

#ifdef __linux__

1431

1206

if(restore_loglevel){

1432

1207

ret = klogctl(7, NULL, 0);

1435

1210

}

1436

1211

}

1437

1212

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

1441

if(ret == -1){

1442

perror("seteuid");

1443

}

1444

1213

goto end;

1445

1214

}

1446

1215

strcpy(network.ifr_name, interface);

1455

1224

}

1456

1225

}

1457

1226

#endif /* __linux__ */

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

1462

if(ret == -1){

1463

perror("seteuid");

1464

}

1227

exitcode = EXIT_FAILURE;

1465

1228

goto end;

1466

1229

}

1467

1230

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

1470

1233

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

1471

1234

if(ret == -1){

1472

1235

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1475

1238

#ifdef __linux__

1476

1239

if(restore_loglevel){

1477

1240

ret = klogctl(7, NULL, 0);

1480

1243

}

1481

1244

}

1482

1245

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1489

1246

goto end;

1490

1247

}

1491

1248

}

1519

1276

}

1520

1277

}

1521

1278

#endif /* __linux__ */

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

}

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");

1537

1297

}

1538

1298

1539

1299

if(quit_now){

1543

1303

ret = init_gnutls_global(pubkey, seckey);

1544

1304

if(ret == -1){

1545

1305

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

1546

exitcode = EX_UNAVAILABLE;

1306

exitcode = EXIT_FAILURE;

1547

1307

goto end;

1548

1308

} else {

1549

1309

gnutls_initialized = true;

1566

1326

1567

1327

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

1568

1328

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

1569

exitcode = EX_UNAVAILABLE;

1329

exitcode = EXIT_FAILURE;

1570

1330

goto end;

1571

1331

} else {

1572

1332

gpgme_initialized = true;

1582

1342

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

1583

1343

if(address == NULL){

1584

1344

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

1585

exitcode = EX_USAGE;

1345

exitcode = EXIT_FAILURE;

1586

1346

goto end;

1587

1347

}

1588

1348

1596

1356

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

1597

1357

or tmpmax != (uint16_t)tmpmax){

1598

1358

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

1599

exitcode = EX_USAGE;

1359

exitcode = EXIT_FAILURE;

1600

1360

goto end;

1601

1361

}

1602

1362

1621

1381

1622

1382

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

1623

1383

if(ret < 0){

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

exitcode = EXIT_FAILURE;

1643

1385

} else {

1644

1386

exitcode = EXIT_SUCCESS;

1645

1387

}

1672

1414

if(mc.server == NULL){

1673

1415

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

1674

1416

avahi_strerror(error));

1675

exitcode = EX_UNAVAILABLE;

1417

exitcode = EXIT_FAILURE;

1676

1418

goto end;

1677

1419

}

1678

1420

1687

1429

if(sb == NULL){

1688

1430

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

1689

1431

avahi_strerror(avahi_server_errno(mc.server)));

1690

exitcode = EX_UNAVAILABLE;

1432

exitcode = EXIT_FAILURE;

1691

1433

goto end;

1692

1434

}

1693

1435

1731

1473

1732

1474

/* Take down the network interface */

1733

1475

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1476

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

1737

1477

if(ret == -1){

1738

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

}

1739

1485

}

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

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1761

1489

}

1762

1490

}

1763

1491

1808

1536

if(quit_now){

1809

1537

sigemptyset(&old_sigterm_action.sa_mask);

1810

1538

old_sigterm_action.sa_handler = SIG_DFL;

1811

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1812

&old_sigterm_action,

1813

NULL));

1539

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

1814

1540

if(ret == -1){

1815

1541

perror("sigaction");

1816

1542

}

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

raise(signal_received);

1825

1544

}

1826

1545

1827

1546

return exitcode;