/mandos/trunk : revision 364

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() */

76

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

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

79

argp_state, struct argp,

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,

423

416

}

424

417

425

418

/* OpenPGP credentials */

426

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

427

420

if(ret != GNUTLS_E_SUCCESS){

428

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

421

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

422

from

423

-Wunreachable-code

424

*/

429

425

safer_gnutls_strerror(ret));

430

426

gnutls_global_deinit();

431

427

return -1;

478

474

static int init_gnutls_session(gnutls_session_t *session){

479

475

int ret;

480

476

/* GnuTLS session creation */

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

487

478

if(ret != GNUTLS_E_SUCCESS){

488

479

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

489

480

safer_gnutls_strerror(ret));

491

482

492

483

{

493

484

const char *err;

494

do {

495

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

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

485

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

501

486

if(ret != GNUTLS_E_SUCCESS){

502

487

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

503

488

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

507

492

}

508

493

}

509

494

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

518

497

if(ret != GNUTLS_E_SUCCESS){

519

498

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

520

499

safer_gnutls_strerror(ret));

523

502

}

524

503

525

504

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

507

528

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

509

534

514

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

535

515

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

536

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

537

520

/* Called when a Mandos server is found */

538

521

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

539

522

AvahiIfIndex if_index,

545

528

struct sockaddr_in6 in6;

546

529

} to;

547

530

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

549

532

size_t buffer_length = 0;

550

533

size_t buffer_capacity = 0;

551

534

size_t written;

552

int retval = -1;

535

int retval = 0;

553

536

gnutls_session_t session;

554

537

int pf; /* Protocol family */

555

538

556

errno = 0;

557

558

539

if(quit_now){

559

errno = EINTR;

560

540

return -1;

561

541

}

562

542

569

549

break;

570

550

default:

571

551

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

572

errno = EINVAL;

573

552

return -1;

574

553

}

575

554

585

564

586

565

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

566

if(tcp_sd < 0){

588

int e = errno;

589

567

perror("socket");

590

errno = e;

568

retval = -1;

591

569

goto mandos_end;

592

570

}

593

571

594

572

if(quit_now){

595

errno = EINTR;

596

573

goto mandos_end;

597

574

}

598

575

605

582

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

606

583

}

607

584

if(ret < 0 ){

608

int e = errno;

609

585

perror("inet_pton");

610

errno = e;

586

retval = -1;

611

587

goto mandos_end;

612

588

}

613

589

if(ret == 0){

614

int e = errno;

615

590

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

616

errno = e;

591

retval = -1;

617

592

goto mandos_end;

618

593

}

619

594

if(af == AF_INET6){

627

602

if(if_index == AVAHI_IF_UNSPEC){

628

603

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

629

604

" without a network interface\n");

630

errno = EINVAL;

605

retval = -1;

631

606

goto mandos_end;

632

607

}

633

608

/* Set the network interface number as scope */

640

615

}

641

616

642

617

if(quit_now){

643

errno = EINTR;

644

618

goto mandos_end;

645

619

}

646

620

677

651

}

678

652

679

653

if(quit_now){

680

errno = EINTR;

681

654

goto mandos_end;

682

655

}

683

656

687

660

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

688

661

}

689

662

if(ret < 0){

690

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

691

int e = errno;

692

perror("connect");

693

errno = e;

694

}

663

perror("connect");

664

retval = -1;

695

665

goto mandos_end;

696

666

}

697

667

698

668

if(quit_now){

699

errno = EINTR;

700

669

goto mandos_end;

701

670

}

702

671

707

676

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

708

677

out_size - written));

709

678

if(ret == -1){

710

int e = errno;

711

679

perror("write");

712

errno = e;

680

retval = -1;

713

681

goto mandos_end;

714

682

}

715

683

written += (size_t)ret;

725

693

}

726

694

727

695

if(quit_now){

728

errno = EINTR;

729

696

goto mandos_end;

730

697

}

731

698

}

735

702

}

736

703

737

704

if(quit_now){

738

errno = EINTR;

739

705

goto mandos_end;

740

706

}

741

707

742

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

709

744

710

if(quit_now){

745

errno = EINTR;

746

711

goto mandos_end;

747

712

}

748

713

749

714

do {

750

715

ret = gnutls_handshake(session);

751

716

if(quit_now){

752

errno = EINTR;

753

717

goto mandos_end;

754

718

}

755

719

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

759

723

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

760

724

gnutls_perror(ret);

761

725

}

762

errno = EPROTO;

726

retval = -1;

763

727

goto mandos_end;

764

728

}

765

729

773

737

while(true){

774

738

775

739

if(quit_now){

776

errno = EINTR;

777

740

goto mandos_end;

778

741

}

779

742

780

743

buffer_capacity = incbuffer(&buffer, buffer_length,

781

744

buffer_capacity);

782

745

if(buffer_capacity == 0){

783

int e = errno;

784

746

perror("incbuffer");

785

errno = e;

747

retval = -1;

786

748

goto mandos_end;

787

749

}

788

750

789

751

if(quit_now){

790

errno = EINTR;

791

752

goto mandos_end;

792

753

}

793

754

806

767

ret = gnutls_handshake(session);

807

768

808

769

if(quit_now){

809

errno = EINTR;

810

770

goto mandos_end;

811

771

}

812

772

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

813

773

if(ret < 0){

814

774

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

815

775

gnutls_perror(ret);

816

errno = EPROTO;

776

retval = -1;

817

777

goto mandos_end;

818

778

}

819

779

break;

820

780

default:

821

781

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

822

782

" encrypted session with Mandos server\n");

783

retval = -1;

823

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

824

errno = EIO;

825

785

goto mandos_end;

826

786

}

827

787

} else {

834

794

}

835

795

836

796

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

841

do {

842

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

843

if(quit_now){

844

errno = EINTR;

845

goto mandos_end;

846

}

847

} 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

}

848

805

849

806

if(buffer_length > 0){

850

807

ssize_t decrypted_buffer_size;

856

813

written = 0;

857

814

while(written < (size_t) decrypted_buffer_size){

858

815

if(quit_now){

859

errno = EINTR;

860

816

goto mandos_end;

861

817

}

862

818

864

820

(size_t)decrypted_buffer_size - written,

865

821

stdout);

866

822

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

867

int e = errno;

868

823

if(debug){

869

824

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

870

825

strerror(errno));

871

826

}

872

errno = e;

873

goto mandos_end;

827

retval = -1;

828

break;

874

829

}

875

830

written += (size_t)ret;

876

831

}

877

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

878

835

}

836

} else {

837

retval = -1;

879

838

}

880

839

881

840

/* Shutdown procedure */

882

841

883

842

mandos_end:

884

{

885

int e = errno;

886

free(decrypted_buffer);

887

free(buffer);

888

if(tcp_sd >= 0){

889

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

890

}

891

if(ret == -1){

892

if(e == 0){

893

e = errno;

894

}

895

perror("close");

896

}

897

gnutls_deinit(session);

898

if(quit_now){

899

e = EINTR;

900

retval = -1;

901

}

902

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;

903

853

}

904

854

return retval;

905

855

}

1021

971

errno = old_errno;

1022

972

}

1023

973

1024

/*

1025

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

1026

* corresponds to an acceptable network device.

1027

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

1028

*/

1029

int good_interface(const struct dirent *if_entry){

1030

ssize_t ssret;

1031

char *flagname = NULL;

1032

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

1033

return 0;

1034

}

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

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

1042

if(flags_fd == -1){

1043

perror("open");

1044

free(flagname);

1045

return 0;

1046

}

1047

free(flagname);

1048

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

1049

/* read line from flags_fd */

1050

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

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

1052

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

1053

if(flagstring == NULL){

1054

perror("malloc");

1055

close(flags_fd);

1056

return 0;

1057

}

1058

while(to_read > 0){

1059

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

1060

(size_t)to_read));

1061

if(ssret == -1){

1062

perror("read");

1063

free(flagstring);

1064

close(flags_fd);

1065

return 0;

1066

}

1067

to_read -= ssret;

1068

if(ssret == 0){

1069

break;

1070

}

1071

}

1072

close(flags_fd);

1073

intmax_t tmpmax;

1074

char *tmp;

1075

errno = 0;

1076

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

1077

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

1078

and not (isspace(*tmp)))

1079

or tmpmax != (ifreq_flags)tmpmax){

1080

if(debug){

1081

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

1082

flagstring, if_entry->d_name);

1083

}

1084

free(flagstring);

1085

return 0;

1086

}

1087

free(flagstring);

1088

ifreq_flags flags = (ifreq_flags)tmpmax;

1089

/* Reject the loopback device */

1090

if(flags & IFF_LOOPBACK){

1091

if(debug){

1092

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

1093

if_entry->d_name);

1094

}

1095

return 0;

1096

}

1097

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

1098

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

1099

if(debug){

1100

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

1101

if_entry->d_name);

1102

}

1103

return 1;

1104

}

1105

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

1106

if(not (flags & IFF_BROADCAST)){

1107

if(debug){

1108

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

1109

if_entry->d_name);

1110

}

1111

return 0;

1112

}

1113

/* Reject non-ARP interfaces (including dummy interfaces) */

1114

if(flags & IFF_NOARP){

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 0;

1120

}

1121

/* Accept this device */

1122

if(debug){

1123

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

1124

if_entry->d_name);

1125

}

1126

return 1;

1127

}

1128

1129

974

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

1130

975

AvahiSServiceBrowser *sb = NULL;

1131

976

int error;

1133

978

intmax_t tmpmax;

1134

979

char *tmp;

1135

980

int exitcode = EXIT_SUCCESS;

1136

const char *interface = "";

981

const char *interface = "eth0";

1137

982

struct ifreq network;

1138

983

int sd = -1;

1139

984

bool take_down_interface = false;

1140

985

uid_t uid;

1141

986

gid_t gid;

987

char *connect_to = NULL;

1142

988

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

1143

989

bool tempdir_created = false;

1144

990

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1149

995

bool gpgme_initialized = false;

1150

996

float delay = 2.5f;

1151

997

1152

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1153

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1154

1000

1155

uid = getuid();

1156

gid = getgid();

1157

1158

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

1159

errno = 0;

1160

ret = setgid(gid);

1161

if(ret == -1){

1162

perror("setgid");

1163

}

1164

1165

/* Lower user privileges (temporarily) */

1166

errno = 0;

1167

ret = seteuid(uid);

1168

if(ret == -1){

1169

perror("seteuid");

1170

}

1171

1172

if(quit_now){

1173

goto end;

1174

}

1175

1176

1001

{

1177

1002

struct argp_option options[] = {

1178

1003

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

1207

1032

.arg = "SECONDS",

1208

1033

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

1209

1034

.group = 2 },

1210

/*

1211

* These reproduce what we would get without ARGP_NO_HELP

1212

*/

1213

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

1214

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

1215

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

1216

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

1217

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

1218

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

1219

1035

{ .name = NULL }

1220

1036

};

1221

1037

1222

1038

error_t parse_opt(int key, char *arg,

1223

1039

struct argp_state *state){

1224

errno = 0;

1225

1040

switch(key){

1226

1041

case 128: /* --debug */

1227

1042

debug = true;

1243

1058

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

1244

1059

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

1245

1060

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

1246

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

1061

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

1062

exit(EXIT_FAILURE);

1247

1063

}

1248

1064

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

1249

1065

break;

1254

1070

errno = 0;

1255

1071

delay = strtof(arg, &tmp);

1256

1072

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

1257

argp_error(state, "Bad delay");

1073

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

1074

exit(EXIT_FAILURE);

1258

1075

}

1259

1076

break;

1260

/*

1261

* These reproduce what we would get without ARGP_NO_HELP

1262

*/

1263

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

1264

argp_state_help(state, state->out_stream,

1265

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1266

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1267

case -3: /* --usage */

1268

argp_state_help(state, state->out_stream,

1269

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1270

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

1271

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

1272

exit(argp_err_exit_status);

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1273

1080

break;

1274

1081

default:

1275

1082

return ARGP_ERR_UNKNOWN;

1276

1083

}

1277

return errno;

1084

return 0;

1278

1085

}

1279

1086

1280

1087

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

1281

1088

.args_doc = "",

1282

1089

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

1283

1090

" passwords from a Mandos server" };

1284

ret = argp_parse(&argp, argc, argv,

1285

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1286

switch(ret){

1287

case 0:

1288

break;

1289

case ENOMEM:

1290

default:

1291

errno = ret;

1292

perror("argp_parse");

1293

exitcode = EX_OSERR;

1294

goto end;

1295

case EINVAL:

1296

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;

1297

1095

goto end;

1298

1096

}

1299

1097

}

1301

1099

if(not debug){

1302

1100

avahi_set_log_function(empty_log);

1303

1101

}

1304

1305

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

1306

struct dirent **direntries;

1307

ret = scandir(sys_class_net, &direntries, good_interface,

1308

alphasort);

1309

if(ret >= 1){

1310

/* Pick the first good interface */

1311

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

1312

if(debug){

1313

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

1314

}

1315

if(interface == NULL){

1316

perror("malloc");

1317

free(direntries);

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

free(direntries);

1322

} else {

1323

free(direntries);

1324

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

1325

exitcode = EXIT_FAILURE;

1326

goto end;

1327

}

1328

}

1329

1102

1330

1103

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

1331

1104

from the signal handler */

1334

1107

mc.simple_poll = avahi_simple_poll_new();

1335

1108

if(mc.simple_poll == NULL){

1336

1109

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

1337

exitcode = EX_UNAVAILABLE;

1110

exitcode = EXIT_FAILURE;

1338

1111

goto end;

1339

1112

}

1340

1113

1342

1115

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

1343

1116

if(ret == -1){

1344

1117

perror("sigaddset");

1345

exitcode = EX_OSERR;

1118

exitcode = EXIT_FAILURE;

1346

1119

goto end;

1347

1120

}

1348

1121

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

1349

1122

if(ret == -1){

1350

1123

perror("sigaddset");

1351

exitcode = EX_OSERR;

1124

exitcode = EXIT_FAILURE;

1352

1125

goto end;

1353

1126

}

1354

1127

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

1355

1128

if(ret == -1){

1356

1129

perror("sigaddset");

1357

exitcode = EX_OSERR;

1130

exitcode = EXIT_FAILURE;

1358

1131

goto end;

1359

1132

}

1360

1133

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

1364

1137

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

1365

1138

if(ret == -1){

1366

1139

perror("sigaction");

1367

return EX_OSERR;

1140

return EXIT_FAILURE;

1368

1141

}

1369

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

1143

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

1371

1144

if(ret == -1){

1372

1145

perror("sigaction");

1373

exitcode = EX_OSERR;

1146

exitcode = EXIT_FAILURE;

1374

1147

goto end;

1375

1148

}

1376

1149

}

1377

1150

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

1378

1151

if(ret == -1){

1379

1152

perror("sigaction");

1380

return EX_OSERR;

1153

return EXIT_FAILURE;

1381

1154

}

1382

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

1156

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

1384

1157

if(ret == -1){

1385

1158

perror("sigaction");

1386

exitcode = EX_OSERR;

1159

exitcode = EXIT_FAILURE;

1387

1160

goto end;

1388

1161

}

1389

1162

}

1390

1163

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

1391

1164

if(ret == -1){

1392

1165

perror("sigaction");

1393

return EX_OSERR;

1166

return EXIT_FAILURE;

1394

1167

}

1395

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

1169

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

1397

1170

if(ret == -1){

1398

1171

perror("sigaction");

1399

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1400

1173

goto end;

1401

1174

}

1402

1175

}

1403

1176

1404

1177

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

1405

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

1178

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

1406

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1407

1180

if(if_index == 0){

1408

1181

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

1409

exitcode = EX_UNAVAILABLE;

1182

exitcode = EXIT_FAILURE;

1410

1183

goto end;

1411

1184

}

1412

1185

1414

1187

goto end;

1415

1188

}

1416

1189

1417

/* Re-raise priviliges */

1418

errno = 0;

1419

ret = seteuid(0);

1420

if(ret == -1){

1421

perror("seteuid");

1422

}

1423

1424

1190

#ifdef __linux__

1425

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1426

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

1192

messages to mess up the prompt */

1427

1193

ret = klogctl(8, NULL, 5);

1428

1194

bool restore_loglevel = true;

1429

1195

if(ret == -1){

1435

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1202

if(sd < 0){

1437

1203

perror("socket");

1438

exitcode = EX_OSERR;

1204

exitcode = EXIT_FAILURE;

1439

1205

#ifdef __linux__

1440

1206

if(restore_loglevel){

1441

1207

ret = klogctl(7, NULL, 0);

1444

1210

}

1445

1211

}

1446

1212

#endif /* __linux__ */

1447

/* Lower privileges */

1448

errno = 0;

1449

ret = seteuid(uid);

1450

if(ret == -1){

1451

perror("seteuid");

1452

}

1453

1213

goto end;

1454

1214

}

1455

1215

strcpy(network.ifr_name, interface);

1464

1224

}

1465

1225

}

1466

1226

#endif /* __linux__ */

1467

exitcode = EX_OSERR;

1468

/* Lower privileges */

1469

errno = 0;

1470

ret = seteuid(uid);

1471

if(ret == -1){

1472

perror("seteuid");

1473

}

1227

exitcode = EXIT_FAILURE;

1474

1228

goto end;

1475

1229

}

1476

1230

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

1479

1233

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

1480

1234

if(ret == -1){

1481

1235

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1483

exitcode = EX_OSERR;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1484

1238

#ifdef __linux__

1485

1239

if(restore_loglevel){

1486

1240

ret = klogctl(7, NULL, 0);

1489

1243

}

1490

1244

}

1491

1245

#endif /* __linux__ */

1492

/* Lower privileges */

1493

errno = 0;

1494

ret = seteuid(uid);

1495

if(ret == -1){

1496

perror("seteuid");

1497

}

1498

1246

goto end;

1499

1247

}

1500

1248

}

1528

1276

}

1529

1277

}

1530

1278

#endif /* __linux__ */

1531

/* Lower privileges */

1532

errno = 0;

1533

if(take_down_interface){

1534

/* Lower privileges */

1535

ret = seteuid(uid);

1536

if(ret == -1){

1537

perror("seteuid");

1538

}

1539

} else {

1540

/* Lower privileges permanently */

1541

ret = setuid(uid);

1542

if(ret == -1){

1543

perror("setuid");

1544

}

1545

}

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");

1546

1297

}

1547

1298

1548

1299

if(quit_now){

1552

1303

ret = init_gnutls_global(pubkey, seckey);

1553

1304

if(ret == -1){

1554

1305

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

1555

exitcode = EX_UNAVAILABLE;

1306

exitcode = EXIT_FAILURE;

1556

1307

goto end;

1557

1308

} else {

1558

1309

gnutls_initialized = true;

1575

1326

1576

1327

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

1577

1328

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

1578

exitcode = EX_UNAVAILABLE;

1329

exitcode = EXIT_FAILURE;

1579

1330

goto end;

1580

1331

} else {

1581

1332

gpgme_initialized = true;

1591

1342

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

1592

1343

if(address == NULL){

1593

1344

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

1594

exitcode = EX_USAGE;

1345

exitcode = EXIT_FAILURE;

1595

1346

goto end;

1596

1347

}

1597

1348

1605

1356

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

1606

1357

or tmpmax != (uint16_t)tmpmax){

1607

1358

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

1608

exitcode = EX_USAGE;

1359

exitcode = EXIT_FAILURE;

1609

1360

goto end;

1610

1361

}

1611

1362

1627

1378

if(quit_now){

1628

1379

goto end;

1629

1380

}

1630

1631

while(not quit_now){

1632

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

1633

if(quit_now or ret == 0){

1634

break;

1635

}

1636

sleep(15);

1637

};

1638

1639

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 {

1640

1386

exitcode = EXIT_SUCCESS;

1641

1387

}

1642

1643

1388

goto end;

1644

1389

}

1645

1390

1669

1414

if(mc.server == NULL){

1670

1415

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

1671

1416

avahi_strerror(error));

1672

exitcode = EX_UNAVAILABLE;

1417

exitcode = EXIT_FAILURE;

1673

1418

goto end;

1674

1419

}

1675

1420

1684

1429

if(sb == NULL){

1685

1430

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

1686

1431

avahi_strerror(avahi_server_errno(mc.server)));

1687

exitcode = EX_UNAVAILABLE;

1432

exitcode = EXIT_FAILURE;

1688

1433

goto end;

1689

1434

}

1690

1435

1728

1473

1729

1474

/* Take down the network interface */

1730

1475

if(take_down_interface){

1731

/* Re-raise priviliges */

1732

errno = 0;

1733

ret = seteuid(0);

1476

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

1734

1477

if(ret == -1){

1735

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

}

1736

1485

}

1737

if(geteuid() == 0){

1738

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

1739

if(ret == -1){

1740

perror("ioctl SIOCGIFFLAGS");

1741

} else if(network.ifr_flags & IFF_UP) {

1742

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

1743

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

1744

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1746

}

1747

}

1748

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

1749

if(ret == -1){

1750

perror("close");

1751

}

1752

/* Lower privileges permanently */

1753

errno = 0;

1754

ret = setuid(uid);

1755

if(ret == -1){

1756

perror("setuid");

1757

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1758

1489

}

1759

1490

}

1760

1491

1805

1536

if(quit_now){

1806

1537

sigemptyset(&old_sigterm_action.sa_mask);

1807

1538

old_sigterm_action.sa_handler = SIG_DFL;

1808

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1809

&old_sigterm_action,

1810

NULL));

1539

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

1811

1540

if(ret == -1){

1812

1541

perror("sigaction");

1813

1542

}

1814

do {

1815

ret = raise(signal_received);

1816

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

1817

if(ret != 0){

1818

perror("raise");

1819

abort();

1820

}

1821

TEMP_FAILURE_RETRY(pause());

1543

raise(signal_received);

1822

1544

}

1823

1545

1824

1546

return exitcode;