/mandos/trunk : revision 351

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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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 */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

87

85

88

86

#ifdef __linux__

89

87

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

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

169

164

*/

170

165

static bool init_gpgme(const char *seckey,

171

166

const char *pubkey, const char *tempdir){

167

int ret;

172

168

gpgme_error_t rc;

173

169

gpgme_engine_info_t engine_info;

174

170

177

173

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

178

174

*/

179

175

bool import_key(const char *filename){

180

int ret;

181

176

int fd;

182

177

gpgme_data_t pgp_data;

183

178

254

249

return false;

255

250

}

256

251

257

return true;

252

return true;

258

253

}

259

254

260

255

/*

479

474

static int init_gnutls_session(gnutls_session_t *session){

480

475

int ret;

481

476

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

488

478

if(ret != GNUTLS_E_SUCCESS){

489

479

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

490

480

safer_gnutls_strerror(ret));

492

482

493

483

{

494

484

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

485

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

502

486

if(ret != GNUTLS_E_SUCCESS){

503

487

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

504

488

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

508

492

}

509

493

}

510

494

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

519

497

if(ret != GNUTLS_E_SUCCESS){

520

498

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

521

499

safer_gnutls_strerror(ret));

524

502

}

525

503

526

504

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

528

507

529

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

509

539

518

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

540

519

AvahiIfIndex if_index,

541

520

int af){

542

int ret, tcp_sd = -1;

521

int ret, tcp_sd;

543

522

ssize_t sret;

544

523

union {

545

524

struct sockaddr_in in;

546

525

struct sockaddr_in6 in6;

547

526

} to;

548

527

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

528

char *decrypted_buffer;

550

529

size_t buffer_length = 0;

551

530

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

552

532

size_t written;

553

int retval = -1;

533

int retval = 0;

554

534

gnutls_session_t session;

555

535

int pf; /* Protocol family */

556

536

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

537

switch(af){

565

538

case AF_INET6:

566

539

pf = PF_INET6;

570

543

break;

571

544

default:

572

545

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

573

errno = EINVAL;

574

546

return -1;

575

547

}

576

548

586

558

587

559

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

560

if(tcp_sd < 0){

589

int e = errno;

590

561

perror("socket");

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

562

return -1;

598

563

}

599

564

600

565

memset(&to, 0, sizeof(to));

606

571

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

607

572

}

608

573

if(ret < 0 ){

609

int e = errno;

610

574

perror("inet_pton");

611

errno = e;

612

goto mandos_end;

575

return -1;

613

576

}

614

577

if(ret == 0){

615

int e = errno;

616

578

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

617

errno = e;

618

goto mandos_end;

579

return -1;

619

580

}

620

581

if(af == AF_INET6){

621

582

to.in6.sin6_port = htons(port); /* Spurious warnings from

628

589

if(if_index == AVAHI_IF_UNSPEC){

629

590

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

630

591

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

592

return -1;

633

593

}

634

594

/* Set the network interface number as scope */

635

595

to.in6.sin6_scope_id = (uint32_t)if_index;

640

600

-Wunreachable-code */

641

601

}

642

602

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

648

603

if(debug){

649

604

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

650

605

char interface[IF_NAMESIZE];

677

632

}

678

633

}

679

634

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

635

if(af == AF_INET6){

686

636

ret = connect(tcp_sd, &to.in6, sizeof(to));

687

637

} else {

688

638

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

689

639

}

690

640

if(ret < 0){

691

int e = errno;

692

641

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

642

return -1;

700

643

}

701

644

702

645

const char *out = mandos_protocol_version;

706

649

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

707

650

out_size - written));

708

651

if(ret == -1){

709

int e = errno;

710

652

perror("write");

711

errno = e;

653

retval = -1;

712

654

goto mandos_end;

713

655

}

714

656

written += (size_t)ret;

722

664

break;

723

665

}

724

666

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

667

}

731

668

732

669

if(debug){

733

670

fprintf(stderr, "Establishing TLS session with %s\n", ip);

734

671

}

735

672

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

741

673

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

674

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

675

do{

749

676

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

754

677

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

755

678

756

679

if(ret != GNUTLS_E_SUCCESS){

758

681

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

759

682

gnutls_perror(ret);

760

683

}

761

errno = EPROTO;

684

retval = -1;

762

685

goto mandos_end;

763

686

}

764

687

770

693

}

771

694

772

695

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

696

buffer_capacity = incbuffer(&buffer, buffer_length,

780

697

buffer_capacity);

781

698

if(buffer_capacity == 0){

782

int e = errno;

783

699

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

700

retval = -1;

790

701

goto mandos_end;

791

702

}

792

703

801

712

case GNUTLS_E_AGAIN:

802

713

break;

803

714

case GNUTLS_E_REHANDSHAKE:

804

do {

715

do{

805

716

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

717

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

812

718

if(ret < 0){

813

719

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

814

720

gnutls_perror(ret);

815

errno = EPROTO;

721

retval = -1;

816

722

goto mandos_end;

817

723

}

818

724

break;

819

725

default:

820

726

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

821

727

" encrypted session with Mandos server\n");

728

retval = -1;

822

729

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

730

goto mandos_end;

825

731

}

826

732

} else {

832

738

fprintf(stderr, "Closing TLS session\n");

833

739

}

834

740

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

742

848

743

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

850

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

745

buffer_length,

852

746

&decrypted_buffer);

853

747

if(decrypted_buffer_size >= 0){

854

855

748

written = 0;

856

749

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

862

750

ret = (int)fwrite(decrypted_buffer + written, 1,

863

751

(size_t)decrypted_buffer_size - written,

864

752

stdout);

865

753

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

866

int e = errno;

867

754

if(debug){

868

755

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

869

756

strerror(errno));

870

757

}

871

errno = e;

872

goto mandos_end;

758

retval = -1;

759

break;

873

760

}

874

761

written += (size_t)ret;

875

762

}

876

retval = 0;

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

877

766

}

767

} else {

768

retval = -1;

878

769

}

879

770

880

771

/* Shutdown procedure */

881

772

882

773

mandos_end:

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

902

778

}

779

gnutls_deinit(session);

903

780

return retval;

904

781

}

905

782

922

799

/* Called whenever a service has been resolved successfully or

923

800

timed out */

924

801

925

if(quit_now){

926

return;

927

}

928

929

802

switch(event){

930

803

default:

931

804

case AVAHI_RESOLVER_FAILURE:

968

841

/* Called whenever a new services becomes available on the LAN or

969

842

is removed from the LAN */

970

843

971

if(quit_now){

972

return;

973

}

974

975

844

switch(event){

976

845

default:

977

846

case AVAHI_BROWSER_FAILURE:

1006

875

}

1007

876

}

1008

877

878

sig_atomic_t quit_now = 0;

879

1009

880

/* stop main loop after sigterm has been called */

1010

static void handle_sigterm(int sig){

881

static void handle_sigterm(__attribute__((unused)) int sig){

1011

882

if(quit_now){

1012

883

return;

1013

884

}

1014

885

quit_now = 1;

1015

signal_received = sig;

1016

886

int old_errno = errno;

1017

887

if(mc.simple_poll != NULL){

1018

888

avahi_simple_poll_quit(mc.simple_poll);

1030

900

const char *interface = "eth0";

1031

901

struct ifreq network;

1032

902

int sd = -1;

1033

bool take_down_interface = false;

903

bool interface_taken_up = false;

1034

904

uid_t uid;

1035

905

gid_t gid;

1036

906

char *connect_to = NULL;

1044

914

bool gpgme_initialized = false;

1045

915

float delay = 2.5f;

1046

916

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

struct sigaction old_sigterm_action;

1048

918

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

919

1050

uid = getuid();

1051

gid = getgid();

1052

1053

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

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

1070

1071

920

{

1072

921

struct argp_option options[] = {

1073

922

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

1102

951

.arg = "SECONDS",

1103

952

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

1104

953

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

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

1109

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

1110

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

1111

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

1112

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

1113

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

1114

954

{ .name = NULL }

1115

955

};

1116

956

1117

957

error_t parse_opt(int key, char *arg,

1118

958

struct argp_state *state){

1119

errno = 0;

1120

959

switch(key){

1121

960

case 128: /* --debug */

1122

961

debug = true;

1138

977

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

1139

978

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

1140

979

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

1141

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

980

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

981

exit(EXIT_FAILURE);

1142

982

}

1143

983

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

1144

984

break;

1149

989

errno = 0;

1150

990

delay = strtof(arg, &tmp);

1151

991

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

1152

argp_error(state, "Bad delay");

992

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

993

exit(EXIT_FAILURE);

1153

994

}

1154

995

break;

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

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

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

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

1166

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

1167

exit(argp_err_exit_status);

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1168

999

break;

1169

1000

default:

1170

1001

return ARGP_ERR_UNKNOWN;

1171

1002

}

1172

return errno;

1003

return 0;

1173

1004

}

1174

1005

1175

1006

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

1176

1007

.args_doc = "",

1177

1008

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

1178

1009

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

1192

1014

goto end;

1193

1015

}

1194

1016

}

1204

1026

mc.simple_poll = avahi_simple_poll_new();

1205

1027

if(mc.simple_poll == NULL){

1206

1028

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

1207

exitcode = EX_UNAVAILABLE;

1029

exitcode = EXIT_FAILURE;

1208

1030

goto end;

1209

1031

}

1210

1032

1212

1034

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

1213

1035

if(ret == -1){

1214

1036

perror("sigaddset");

1215

exitcode = EX_OSERR;

1037

exitcode = EXIT_FAILURE;

1216

1038

goto end;

1217

1039

}

1218

1040

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

1219

1041

if(ret == -1){

1220

1042

perror("sigaddset");

1221

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1222

1044

goto end;

1223

1045

}

1224

1046

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

1225

1047

if(ret == -1){

1226

1048

perror("sigaddset");

1227

exitcode = EX_OSERR;

1228

goto end;

1229

}

1230

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

1231

| [[info:libc:Initial Signal Actions]] |

1232

| [[info:libc:Basic Signal Handling]] |

1233

*/

1234

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

1235

if(ret == -1){

1236

perror("sigaction");

1237

return EX_OSERR;

1238

}

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

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

1241

if(ret == -1){

1242

perror("sigaction");

1243

exitcode = EX_OSERR;

1244

goto end;

1245

}

1246

}

1247

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

1248

if(ret == -1){

1249

perror("sigaction");

1250

return EX_OSERR;

1251

}

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

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

1254

if(ret == -1){

1255

perror("sigaction");

1256

exitcode = EX_OSERR;

1257

goto end;

1258

}

1259

}

1260

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

1261

if(ret == -1){

1262

perror("sigaction");

1263

return EX_OSERR;

1264

}

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

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

1267

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1273

1058

1274

1059

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

1275

1060

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

1061

#ifdef __linux__

1295

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1063

messages to mess up the prompt */

1297

1064

ret = klogctl(8, NULL, 5);

1298

1065

bool restore_loglevel = true;

1299

1066

if(ret == -1){

1305

1072

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1073

if(sd < 0){

1307

1074

perror("socket");

1308

exitcode = EX_OSERR;

1075

exitcode = EXIT_FAILURE;

1309

1076

#ifdef __linux__

1310

1077

if(restore_loglevel){

1311

1078

ret = klogctl(7, NULL, 0);

1314

1081

}

1315

1082

}

1316

1083

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1084

goto end;

1324

1085

}

1325

1086

strcpy(network.ifr_name, interface);

1334

1095

}

1335

1096

}

1336

1097

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1098

exitcode = EXIT_FAILURE;

1344

1099

goto end;

1345

1100

}

1346

1101

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

1347

1102

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

1103

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

1350

1104

if(ret == -1){

1351

take_down_interface = false;

1352

1105

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1106

exitcode = EXIT_FAILURE;

1354

1107

#ifdef __linux__

1355

1108

if(restore_loglevel){

1356

1109

ret = klogctl(7, NULL, 0);

1359

1112

}

1360

1113

}

1361

1114

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1115

goto end;

1369

1116

}

1117

interface_taken_up = true;

1370

1118

}

1371

1119

/* sleep checking until interface is running */

1372

1120

for(int i=0; i < delay * 4; i++){

1382

1130

perror("nanosleep");

1383

1131

}

1384

1132

}

1385

if(not take_down_interface){

1386

/* We won't need the socket anymore */

1133

if(not interface_taken_up){

1387

1134

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

1388

1135

if(ret == -1){

1389

1136

perror("close");

1398

1145

}

1399

1146

}

1400

1147

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1416

}

1417

1418

if(quit_now){

1419

goto end;

1148

}

1149

1150

uid = getuid();

1151

gid = getgid();

1152

1153

errno = 0;

1154

setgid(gid);

1155

if(ret == -1){

1156

perror("setgid");

1157

}

1158

1159

ret = setuid(uid);

1160

if(ret == -1){

1161

perror("setuid");

1420

1162

}

1421

1163

1422

1164

ret = init_gnutls_global(pubkey, seckey);

1423

1165

if(ret == -1){

1424

1166

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

1425

exitcode = EX_UNAVAILABLE;

1167

exitcode = EXIT_FAILURE;

1426

1168

goto end;

1427

1169

} else {

1428

1170

gnutls_initialized = true;

1429

1171

}

1430

1172

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1436

1173

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

1174

perror("mkdtemp");

1439

1175

goto end;

1440

1176

}

1441

1442

if(quit_now){

1443

goto end;

1444

}

1177

tempdir_created = true;

1445

1178

1446

1179

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

1447

1180

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

1448

exitcode = EX_UNAVAILABLE;

1181

exitcode = EXIT_FAILURE;

1449

1182

goto end;

1450

1183

} else {

1451

1184

gpgme_initialized = true;

1452

1185

}

1453

1186

1454

if(quit_now){

1455

goto end;

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

1456

1194

}

1457

1195

1458

1196

if(connect_to != NULL){

1461

1199

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

1462

1200

if(address == NULL){

1463

1201

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

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1202

exitcode = EXIT_FAILURE;

1203

goto end;

1204

}

1472

1205

uint16_t port;

1473

1206

errno = 0;

1474

1207

tmpmax = strtoimax(address+1, &tmp, 10);

1475

1208

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

1476

1209

or tmpmax != (uint16_t)tmpmax){

1477

1210

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

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1486

1214

port = (uint16_t)tmpmax;

1487

1215

*address = '\0';

1488

1216

address = connect_to;

1493

1221

} else {

1494

1222

af = AF_INET;

1495

1223

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1501

1224

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

1502

1225

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1226

exitcode = EXIT_FAILURE;

1522

1227

} else {

1523

1228

exitcode = EXIT_SUCCESS;

1524

1229

}

1525

1230

goto end;

1526

1231

}

1527

1528

if(quit_now){

1529

goto end;

1530

}

1531

1232

1532

1233

{

1533

1234

AvahiServerConfig config;

1534

1235

/* Do not publish any local Zeroconf records */

1551

1252

if(mc.server == NULL){

1552

1253

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

1553

1254

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1255

exitcode = EXIT_FAILURE;

1559

1256

goto end;

1560

1257

}

1561

1258

1566

1263

if(sb == NULL){

1567

1264

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

1568

1265

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1266

exitcode = EXIT_FAILURE;

1574

1267

goto end;

1575

1268

}

1576

1269

1609

1302

}

1610

1303

1611

1304

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1305

if(interface_taken_up){

1306

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

1616

1307

if(ret == -1){

1617

perror("seteuid");

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1618

1315

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1640

1319

}

1641

1320

}

1642

1321

1684

1363

}

1685

1364

}

1686

1365

1687

if(quit_now){

1688

sigemptyset(&old_sigterm_action.sa_mask);

1689

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1693

if(ret == -1){

1694

perror("sigaction");

1695

}

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1704

}

1705

1706

1366

return exitcode;

1707

1367

}