/mandos/trunk : revision 402

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, EXIT_FAILURE,

47

srand(), strtof() */

46

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

47

strtof(), abort() */

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(), setuid(),

75

setgid() */

74

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

75

setgid(), pause() */

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, sigaction,

84

sig_atomic_t */

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 */

85

87

86

88

#ifdef __linux__

87

89

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

142

144

.dh_bits = 1024, .priority = "SECURE256"

143

145

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

144

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

145

150

/*

146

151

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

147

152

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

164

169

*/

165

170

static bool init_gpgme(const char *seckey,

166

171

const char *pubkey, const char *tempdir){

167

int ret;

168

172

gpgme_error_t rc;

169

173

gpgme_engine_info_t engine_info;

170

174

173

177

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

174

178

*/

175

179

bool import_key(const char *filename){

180

int ret;

176

181

int fd;

177

182

gpgme_data_t pgp_data;

178

183

249

254

return false;

250

255

}

251

256

252

return true;

257

return true;

253

258

}

254

259

255

260

/*

474

479

static int init_gnutls_session(gnutls_session_t *session){

475

480

int ret;

476

481

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

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);

478

488

if(ret != GNUTLS_E_SUCCESS){

479

489

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

480

490

safer_gnutls_strerror(ret));

482

492

483

493

{

484

494

const char *err;

485

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

486

502

if(ret != GNUTLS_E_SUCCESS){

487

503

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

488

504

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

492

508

}

493

509

}

494

510

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

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);

497

519

if(ret != GNUTLS_E_SUCCESS){

498

520

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

499

521

safer_gnutls_strerror(ret));

502

524

}

503

525

504

526

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

528

508

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

530

518

539

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

519

540

AvahiIfIndex if_index,

520

541

int af){

521

int ret, tcp_sd;

542

int ret, tcp_sd = -1;

522

543

ssize_t sret;

523

544

union {

524

545

struct sockaddr_in in;

525

546

struct sockaddr_in6 in6;

526

547

} to;

527

548

char *buffer = NULL;

528

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

529

550

size_t buffer_length = 0;

530

551

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

552

size_t written;

533

int retval = 0;

553

int retval = -1;

534

554

gnutls_session_t session;

535

555

int pf; /* Protocol family */

536

556

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

537

564

switch(af){

538

565

case AF_INET6:

539

566

pf = PF_INET6;

543

570

break;

544

571

default:

545

572

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

573

errno = EINVAL;

546

574

return -1;

547

575

}

548

576

558

586

559

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

588

if(tcp_sd < 0){

589

int e = errno;

561

590

perror("socket");

562

return -1;

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

563

598

}

564

599

565

600

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

571

606

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

572

607

}

573

608

if(ret < 0 ){

609

int e = errno;

574

610

perror("inet_pton");

575

return -1;

611

errno = e;

612

goto mandos_end;

576

613

}

577

614

if(ret == 0){

615

int e = errno;

578

616

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

579

return -1;

617

errno = e;

618

goto mandos_end;

580

619

}

581

620

if(af == AF_INET6){

582

621

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

589

628

if(if_index == AVAHI_IF_UNSPEC){

590

629

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

591

630

" without a network interface\n");

592

return -1;

631

errno = EINVAL;

632

goto mandos_end;

593

633

}

594

634

/* Set the network interface number as scope */

595

635

to.in6.sin6_scope_id = (uint32_t)if_index;

600

640

-Wunreachable-code */

601

641

}

602

642

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

603

648

if(debug){

604

649

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

605

650

char interface[IF_NAMESIZE];

632

677

}

633

678

}

634

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

635

685

if(af == AF_INET6){

636

686

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

637

687

} else {

638

688

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

639

689

}

640

690

if(ret < 0){

691

int e = errno;

641

692

perror("connect");

642

return -1;

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

643

700

}

644

701

645

702

const char *out = mandos_protocol_version;

649

706

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

650

707

out_size - written));

651

708

if(ret == -1){

709

int e = errno;

652

710

perror("write");

653

retval = -1;

711

errno = e;

654

712

goto mandos_end;

655

713

}

656

714

written += (size_t)ret;

664

722

break;

665

723

}

666

724

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

667

730

}

668

731

669

732

if(debug){

670

733

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

671

734

}

672

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

673

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

742

675

do{

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

676

749

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

677

754

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

678

755

679

756

if(ret != GNUTLS_E_SUCCESS){

681

758

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

682

759

gnutls_perror(ret);

683

760

}

684

retval = -1;

761

errno = EPROTO;

685

762

goto mandos_end;

686

763

}

687

764

693

770

}

694

771

695

772

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

696

779

buffer_capacity = incbuffer(&buffer, buffer_length,

697

780

buffer_capacity);

698

781

if(buffer_capacity == 0){

782

int e = errno;

699

783

perror("incbuffer");

700

retval = -1;

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

701

790

goto mandos_end;

702

791

}

703

792

712

801

case GNUTLS_E_AGAIN:

713

802

break;

714

803

case GNUTLS_E_REHANDSHAKE:

715

do{

804

do {

716

805

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

717

811

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

718

812

if(ret < 0){

719

813

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

720

814

gnutls_perror(ret);

721

retval = -1;

815

errno = EPROTO;

722

816

goto mandos_end;

723

817

}

724

818

break;

725

819

default:

726

820

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

727

821

" encrypted session with Mandos server\n");

728

retval = -1;

729

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

730

824

goto mandos_end;

731

825

}

732

826

} else {

738

832

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

739

833

}

740

834

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

742

847

743

848

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

744

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

851

buffer_length,

746

852

&decrypted_buffer);

747

853

if(decrypted_buffer_size >= 0){

854

748

855

written = 0;

749

856

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

750

862

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

751

863

(size_t)decrypted_buffer_size - written,

752

864

stdout);

753

865

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

866

int e = errno;

754

867

if(debug){

755

868

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

756

869

strerror(errno));

757

870

}

758

retval = -1;

759

break;

871

errno = e;

872

goto mandos_end;

760

873

}

761

874

written += (size_t)ret;

762

875

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

876

retval = 0;

766

877

}

767

} else {

768

retval = -1;

769

878

}

770

879

771

880

/* Shutdown procedure */

772

881

773

882

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

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;

778

902

}

779

gnutls_deinit(session);

780

903

return retval;

781

904

}

782

905

799

922

/* Called whenever a service has been resolved successfully or

800

923

timed out */

801

924

925

if(quit_now){

926

return;

927

}

928

802

929

switch(event){

803

930

default:

804

931

case AVAHI_RESOLVER_FAILURE:

841

968

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

842

969

is removed from the LAN */

843

970

971

if(quit_now){

972

return;

973

}

974

844

975

switch(event){

845

976

default:

846

977

case AVAHI_BROWSER_FAILURE:

875

1006

}

876

1007

}

877

1008

878

sig_atomic_t quit_now = 0;

879

880

1009

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

881

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

1010

static void handle_sigterm(int sig){

882

1011

if(quit_now){

883

1012

return;

884

1013

}

885

1014

quit_now = 1;

1015

signal_received = sig;

886

1016

int old_errno = errno;

887

1017

if(mc.simple_poll != NULL){

888

1018

avahi_simple_poll_quit(mc.simple_poll);

900

1030

const char *interface = "eth0";

901

1031

struct ifreq network;

902

1032

int sd = -1;

903

bool interface_taken_up = false;

1033

bool take_down_interface = false;

904

1034

uid_t uid;

905

1035

gid_t gid;

906

1036

char *connect_to = NULL;

914

1044

bool gpgme_initialized = false;

915

1045

float delay = 2.5f;

916

1046

917

struct sigaction old_sigterm_action;

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

919

1049

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

920

1071

{

921

1072

struct argp_option options[] = {

922

1073

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

951

1102

.arg = "SECONDS",

952

1103

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

953

1104

.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 },

954

1114

{ .name = NULL }

955

1115

};

956

1116

957

1117

error_t parse_opt(int key, char *arg,

958

1118

struct argp_state *state){

1119

errno = 0;

959

1120

switch(key){

960

1121

case 128: /* --debug */

961

1122

debug = true;

977

1138

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

978

1139

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

979

1140

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

980

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

981

exit(EXIT_FAILURE);

1141

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

982

1142

}

983

1143

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

984

1144

break;

989

1149

errno = 0;

990

1150

delay = strtof(arg, &tmp);

991

1151

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

992

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

993

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

994

1153

}

995

1154

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

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);

999

1168

break;

1000

1169

default:

1001

1170

return ARGP_ERR_UNKNOWN;

1002

1171

}

1003

return 0;

1172

return errno;

1004

1173

}

1005

1174

1006

1175

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

1007

1176

.args_doc = "",

1008

1177

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

1009

1178

" passwords from a Mandos server" };

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;

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;

1014

1192

goto end;

1015

1193

}

1016

1194

}

1026

1204

mc.simple_poll = avahi_simple_poll_new();

1027

1205

if(mc.simple_poll == NULL){

1028

1206

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

1029

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1030

1208

goto end;

1031

1209

}

1032

1210

1034

1212

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

1035

1213

if(ret == -1){

1036

1214

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1038

1216

goto end;

1039

1217

}

1040

1218

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

1041

1219

if(ret == -1){

1042

1220

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1044

1222

goto end;

1045

1223

}

1046

1224

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

1047

1225

if(ret == -1){

1048

1226

perror("sigaddset");

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

}

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

}

1058

1273

1059

1274

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

1060

1275

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

1061

1294

#ifdef __linux__

1062

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1296

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

1064

1297

ret = klogctl(8, NULL, 5);

1065

1298

bool restore_loglevel = true;

1066

1299

if(ret == -1){

1072

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

1306

if(sd < 0){

1074

1307

perror("socket");

1075

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1076

1309

#ifdef __linux__

1077

1310

if(restore_loglevel){

1078

1311

ret = klogctl(7, NULL, 0);

1081

1314

}

1082

1315

}

1083

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1084

1323

goto end;

1085

1324

}

1086

1325

strcpy(network.ifr_name, interface);

1095

1334

}

1096

1335

}

1097

1336

#endif /* __linux__ */

1098

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1099

1344

goto end;

1100

1345

}

1101

1346

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

1102

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1103

1349

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

1104

1350

if(ret == -1){

1351

take_down_interface = false;

1105

1352

perror("ioctl SIOCSIFFLAGS");

1106

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1107

1354

#ifdef __linux__

1108

1355

if(restore_loglevel){

1109

1356

ret = klogctl(7, NULL, 0);

1112

1359

}

1113

1360

}

1114

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1115

1368

goto end;

1116

1369

}

1117

interface_taken_up = true;

1118

1370

}

1119

1371

/* sleep checking until interface is running */

1120

1372

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

1130

1382

perror("nanosleep");

1131

1383

}

1132

1384

}

1133

if(not interface_taken_up){

1385

if(not take_down_interface){

1386

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

1134

1387

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

1135

1388

if(ret == -1){

1136

1389

perror("close");

1145

1398

}

1146

1399

}

1147

1400

#endif /* __linux__ */

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");

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;

1162

1420

}

1163

1421

1164

1422

ret = init_gnutls_global(pubkey, seckey);

1165

1423

if(ret == -1){

1166

1424

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

1167

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1168

1426

goto end;

1169

1427

} else {

1170

1428

gnutls_initialized = true;

1171

1429

}

1172

1430

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1173

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1174

1438

perror("mkdtemp");

1175

1439

goto end;

1176

1440

}

1177

tempdir_created = true;

1441

1442

if(quit_now){

1443

goto end;

1444

}

1178

1445

1179

1446

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

1180

1447

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

1181

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1182

1449

goto end;

1183

1450

} else {

1184

1451

gpgme_initialized = true;

1185

1452

}

1186

1453

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

}

1454

if(quit_now){

1455

goto end;

1194

1456

}

1195

1457

1196

1458

if(connect_to != NULL){

1199

1461

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

1200

1462

if(address == NULL){

1201

1463

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

1202

exitcode = EXIT_FAILURE;

1203

goto end;

1204

}

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1205

1472

uint16_t port;

1206

1473

errno = 0;

1207

1474

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

1208

1475

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

1209

1476

or tmpmax != (uint16_t)tmpmax){

1210

1477

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

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1214

1486

port = (uint16_t)tmpmax;

1215

1487

*address = '\0';

1216

1488

address = connect_to;

1221

1493

} else {

1222

1494

af = AF_INET;

1223

1495

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1224

1501

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

1225

1502

if(ret < 0){

1226

exitcode = EXIT_FAILURE;

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

}

1227

1522

} else {

1228

1523

exitcode = EXIT_SUCCESS;

1229

1524

}

1230

1525

goto end;

1231

1526

}

1232

1527

1528

if(quit_now){

1529

goto end;

1530

}

1531

1233

1532

{

1234

1533

AvahiServerConfig config;

1235

1534

/* Do not publish any local Zeroconf records */

1252

1551

if(mc.server == NULL){

1253

1552

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

1254

1553

avahi_strerror(error));

1255

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1256

1559

goto end;

1257

1560

}

1258

1561

1263

1566

if(sb == NULL){

1264

1567

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

1265

1568

avahi_strerror(avahi_server_errno(mc.server)));

1266

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1267

1574

goto end;

1268

1575

}

1269

1576

1302

1609

}

1303

1610

1304

1611

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1307

1616

if(ret == -1){

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

}

1617

perror("seteuid");

1315

1618

}

1316

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

1317

if(ret == -1){

1318

perror("close");

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

}

1319

1640

}

1320

1641

}

1321

1642

1363

1684

}

1364

1685

}

1365

1686

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

1366

1706

return exitcode;

1367

1707

}