/mandos/trunk : revision 312

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

37

44

40

#include <stdint.h> /* uint16_t, uint32_t */

45

41

#include <stddef.h> /* NULL, size_t, ssize_t */

46

42

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

47

srand(), strtof(), abort() */

43

srand(), strtof() */

48

44

#include <stdbool.h> /* bool, false, true */

49

45

#include <string.h> /* memset(), strcmp(), strlen(),

50

46

strerror(), asprintf(), strcpy() */

71

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

68

*/

73

69

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

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

75

setgid(), pause() */

70

getuid(), getgid(), setuid(),

71

setgid() */

76

72

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

77

73

#include <iso646.h> /* not, or, and */

78

74

#include <argp.h> /* struct argp_option, error_t, struct

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

78

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

86

81

87

82

#ifdef __linux__

88

83

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

143

138

.dh_bits = 1024, .priority = "SECURE256"

144

139

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

145

140

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

149

141

/*

150

142

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

151

143

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

168

160

*/

169

161

static bool init_gpgme(const char *seckey,

170

162

const char *pubkey, const char *tempdir){

163

int ret;

171

164

gpgme_error_t rc;

172

165

gpgme_engine_info_t engine_info;

173

166

176

169

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

177

170

*/

178

171

bool import_key(const char *filename){

179

int ret;

180

172

int fd;

181

173

gpgme_data_t pgp_data;

182

174

253

245

return false;

254

246

}

255

247

256

return true;

248

return true;

257

249

}

258

250

259

251

/*

313

305

}

314

306

gpgme_recipient_t recipient;

315

307

recipient = result->recipients;

316

while(recipient != NULL){

317

fprintf(stderr, "Public key algorithm: %s\n",

318

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

320

fprintf(stderr, "Secret key available: %s\n",

321

recipient->status == GPG_ERR_NO_SECKEY

322

? "No" : "Yes");

323

recipient = recipient->next;

308

if(recipient){

309

while(recipient != NULL){

310

fprintf(stderr, "Public key algorithm: %s\n",

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

313

fprintf(stderr, "Secret key available: %s\n",

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

324

318

}

325

319

}

326

320

}

478

472

static int init_gnutls_session(gnutls_session_t *session){

479

473

int ret;

480

474

/* 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);

475

ret = gnutls_init(session, GNUTLS_SERVER);

487

476

if(ret != GNUTLS_E_SUCCESS){

488

477

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

489

478

safer_gnutls_strerror(ret));

491

480

492

481

{

493

482

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);

483

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

501

484

if(ret != GNUTLS_E_SUCCESS){

502

485

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

503

486

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

507

490

}

508

491

}

509

492

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);

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

518

495

if(ret != GNUTLS_E_SUCCESS){

519

496

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

520

497

safer_gnutls_strerror(ret));

523

500

}

524

501

525

502

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

527

505

528

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

507

538

516

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

539

517

AvahiIfIndex if_index,

540

518

int af){

541

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

542

520

ssize_t sret;

543

521

union {

544

522

struct sockaddr_in in;

545

523

struct sockaddr_in6 in6;

546

524

} to;

547

525

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

549

527

size_t buffer_length = 0;

550

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

551

530

size_t written;

552

int retval = -1;

531

int retval = 0;

553

532

gnutls_session_t session;

554

533

int pf; /* Protocol family */

555

534

556

if(quit_now){

557

return -1;

558

}

559

560

535

switch(af){

561

536

case AF_INET6:

562

537

pf = PF_INET6;

582

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

583

558

if(tcp_sd < 0){

584

559

perror("socket");

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

goto mandos_end;

560

return -1;

590

561

}

591

562

592

563

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

593

564

if(af == AF_INET6){

594

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

595

566

ret = inet_pton(af, ip, &to.in6.sin6_addr);

596

567

} else { /* IPv4 */

597

568

to.in.sin_family = (sa_family_t)af;

599

570

}

600

571

if(ret < 0 ){

601

572

perror("inet_pton");

602

goto mandos_end;

573

return -1;

603

574

}

604

575

if(ret == 0){

605

576

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

606

goto mandos_end;

577

return -1;

607

578

}

608

579

if(af == AF_INET6){

609

580

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

616

587

if(if_index == AVAHI_IF_UNSPEC){

617

588

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

618

589

" without a network interface\n");

619

goto mandos_end;

590

return -1;

620

591

}

621

592

/* Set the network interface number as scope */

622

593

to.in6.sin6_scope_id = (uint32_t)if_index;

627

598

-Wunreachable-code */

628

599

}

629

600

630

if(quit_now){

631

goto mandos_end;

632

}

633

634

601

if(debug){

635

602

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

636

603

char interface[IF_NAMESIZE];

663

630

}

664

631

}

665

632

666

if(quit_now){

667

goto mandos_end;

668

}

669

670

633

if(af == AF_INET6){

671

634

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

672

635

} else {

674

637

}

675

638

if(ret < 0){

676

639

perror("connect");

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

640

return -1;

682

641

}

683

642

684

643

const char *out = mandos_protocol_version;

689

648

out_size - written));

690

649

if(ret == -1){

691

650

perror("write");

651

retval = -1;

692

652

goto mandos_end;

693

653

}

694

654

written += (size_t)ret;

702

662

break;

703

663

}

704

664

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

709

665

}

710

666

711

667

if(debug){

712

668

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

713

669

}

714

670

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

720

672

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

673

do{

726

674

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

730

675

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

731

676

732

677

if(ret != GNUTLS_E_SUCCESS){

734

679

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

735

680

gnutls_perror(ret);

736

681

}

682

retval = -1;

737

683

goto mandos_end;

738

684

}

739

685

745

691

}

746

692

747

693

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

753

694

buffer_capacity = incbuffer(&buffer, buffer_length,

754

695

buffer_capacity);

755

696

if(buffer_capacity == 0){

756

697

perror("incbuffer");

757

goto mandos_end;

758

}

759

760

if(quit_now){

698

retval = -1;

761

699

goto mandos_end;

762

700

}

763

701

772

710

case GNUTLS_E_AGAIN:

773

711

break;

774

712

case GNUTLS_E_REHANDSHAKE:

775

do {

713

do{

776

714

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

781

715

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

782

716

if(ret < 0){

783

717

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

784

718

gnutls_perror(ret);

719

retval = -1;

785

720

goto mandos_end;

786

721

}

787

722

break;

788

723

default:

789

724

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

790

725

" encrypted session with Mandos server\n");

726

retval = -1;

791

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

792

728

goto mandos_end;

793

729

}

800

736

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

801

737

}

802

738

803

if(quit_now){

804

goto mandos_end;

805

}

806

807

do {

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

809

if(quit_now){

810

goto mandos_end;

811

}

812

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

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

813

740

814

741

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

816

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

817

743

buffer_length,

818

744

&decrypted_buffer);

819

745

if(decrypted_buffer_size >= 0){

820

821

746

written = 0;

822

747

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

827

748

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

828

749

(size_t)decrypted_buffer_size - written,

829

750

stdout);

832

753

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

833

754

strerror(errno));

834

755

}

835

goto mandos_end;

756

retval = -1;

757

break;

836

758

}

837

759

written += (size_t)ret;

838

760

}

839

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

840

764

}

765

} else {

766

retval = -1;

841

767

}

842

768

843

769

/* Shutdown procedure */

844

770

845

771

mandos_end:

846

free(decrypted_buffer);

847

772

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

773

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

851

774

if(ret == -1){

852

775

perror("close");

853

776

}

854

777

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

858

778

return retval;

859

779

}

860

780

877

797

/* Called whenever a service has been resolved successfully or

878

798

timed out */

879

799

880

if(quit_now){

881

return;

882

}

883

884

800

switch(event){

885

801

default:

886

802

case AVAHI_RESOLVER_FAILURE:

923

839

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

924

840

is removed from the LAN */

925

841

926

if(quit_now){

927

return;

928

}

929

930

842

switch(event){

931

843

default:

932

844

case AVAHI_BROWSER_FAILURE:

942

854

the callback function is called the Avahi server will free the

943

855

resolver for us. */

944

856

945

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

946

name, type, domain, protocol, 0,

947

resolve_callback, NULL) == NULL)

857

if(!(avahi_s_service_resolver_new(mc.server, interface,

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

948

861

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

949

862

name, avahi_strerror(avahi_server_errno(mc.server)));

950

863

break;

961

874

}

962

875

}

963

876

877

sig_atomic_t quit_now = 0;

878

964

879

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

965

static void handle_sigterm(int sig){

880

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

966

881

if(quit_now){

967

882

return;

968

883

}

969

884

quit_now = 1;

970

signal_received = sig;

971

885

int old_errno = errno;

972

886

if(mc.simple_poll != NULL){

973

887

avahi_simple_poll_quit(mc.simple_poll);

984

898

int exitcode = EXIT_SUCCESS;

985

899

const char *interface = "eth0";

986

900

struct ifreq network;

987

int sd = -1;

988

bool take_down_interface = false;

901

int sd;

989

902

uid_t uid;

990

903

gid_t gid;

991

904

char *connect_to = NULL;

995

908

const char *seckey = PATHDIR "/" SECKEY;

996

909

const char *pubkey = PATHDIR "/" PUBKEY;

997

910

911

/* Initialize Mandos context */

912

mc = (mandos_context){ .simple_poll = NULL, .server = NULL,

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

998

915

bool gnutls_initialized = false;

999

916

bool gpgme_initialized = false;

1000

917

float delay = 2.5f;

1001

918

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

struct sigaction old_sigterm_action;

1003

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1004

921

1005

uid = getuid();

1006

gid = getgid();

1007

1008

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

1009

errno = 0;

1010

ret = setgid(gid);

1011

if(ret == -1){

1012

perror("setgid");

1013

}

1014

1015

/* Lower user privileges (temporarily) */

1016

errno = 0;

1017

ret = seteuid(uid);

1018

if(ret == -1){

1019

perror("seteuid");

1020

}

1021

1022

if(quit_now){

1023

goto end;

1024

}

1025

1026

922

{

1027

923

struct argp_option options[] = {

1028

924

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

1057

953

.arg = "SECONDS",

1058

954

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

1059

955

.group = 2 },

1060

/*

1061

* These reproduce what we would get without ARGP_NO_HELP

1062

*/

1063

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

1064

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

1065

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

1066

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

1067

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

1068

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

1069

956

{ .name = NULL }

1070

957

};

1071

958

1072

959

error_t parse_opt(int key, char *arg,

1073

960

struct argp_state *state){

1074

errno = 0;

1075

961

switch(key){

1076

962

case 128: /* --debug */

1077

963

debug = true;

1093

979

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

1094

980

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

1095

981

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

1096

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

982

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

983

exit(EXIT_FAILURE);

1097

984

}

1098

985

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

1099

986

break;

1104

991

errno = 0;

1105

992

delay = strtof(arg, &tmp);

1106

993

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

1107

argp_error(state, "Bad delay");

994

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

995

exit(EXIT_FAILURE);

1108

996

}

1109

997

break;

1110

/*

1111

* These reproduce what we would get without ARGP_NO_HELP

1112

*/

1113

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

1114

argp_state_help(state, state->out_stream,

1115

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1116

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1117

case -3: /* --usage */

1118

argp_state_help(state, state->out_stream,

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1120

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

1121

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

1122

exit(argp_err_exit_status);

998

case ARGP_KEY_ARG:

999

argp_usage(state);

1000

case ARGP_KEY_END:

1123

1001

break;

1124

1002

default:

1125

1003

return ARGP_ERR_UNKNOWN;

1126

1004

}

1127

return errno;

1005

return 0;

1128

1006

}

1129

1007

1130

1008

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

1131

1009

.args_doc = "",

1132

1010

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

1133

1011

" passwords from a Mandos server" };

1134

ret = argp_parse(&argp, argc, argv,

1135

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1136

switch(ret){

1137

case 0:

1138

break;

1139

case ENOMEM:

1140

default:

1141

errno = ret;

1142

perror("argp_parse");

1143

exitcode = EX_OSERR;

1144

goto end;

1145

case EINVAL:

1146

exitcode = EX_USAGE;

1012

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

1013

if(ret == ARGP_ERR_UNKNOWN){

1014

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

1015

exitcode = EXIT_FAILURE;

1147

1016

goto end;

1148

1017

}

1149

1018

}

1182

1051

exitcode = EXIT_FAILURE;

1183

1052

goto end;

1184

1053

}

1185

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

1186

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

1187

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

1188

*/

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

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

1203

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1206

}

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

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

1209

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1214

}

1215

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

1216

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1219

}

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

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

1222

if(ret == -1){

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1225

goto end;

1226

}

1227

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1228

1060

1229

1061

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

1230

1062

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1249

1063

#ifdef __linux__

1250

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

1065

messages to mess up the prompt */

1252

1066

ret = klogctl(8, NULL, 5);

1253

1067

bool restore_loglevel = true;

1254

1068

if(ret == -1){

1269

1083

}

1270

1084

}

1271

1085

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

1086

goto end;

1279

1087

}

1280

1088

strcpy(network.ifr_name, interface);

1290

1098

}

1291

1099

#endif /* __linux__ */

1292

1100

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

1101

goto end;

1300

1102

}

1301

1103

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

1302

1104

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

1105

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

1305

1106

if(ret == -1){

1306

take_down_interface = false;

1307

1107

perror("ioctl SIOCSIFFLAGS");

1308

1108

exitcode = EXIT_FAILURE;

1309

1109

#ifdef __linux__

1314

1114

}

1315

1115

}

1316

1116

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1117

goto end;

1324

1118

}

1325

1119

}

1337

1131

perror("nanosleep");

1338

1132

}

1339

1133

}

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1346

1137

}

1347

1138

#ifdef __linux__

1348

1139

if(restore_loglevel){

1353

1144

}

1354

1145

}

1355

1146

#endif /* __linux__ */

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

1364

} else {

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

1371

}

1372

1373

if(quit_now){

1374

goto end;

1147

}

1148

1149

uid = getuid();

1150

gid = getgid();

1151

1152

errno = 0;

1153

setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

ret = setuid(uid);

1159

if(ret == -1){

1160

perror("setuid");

1375

1161

}

1376

1162

1377

1163

ret = init_gnutls_global(pubkey, seckey);

1383

1169

gnutls_initialized = true;

1384

1170

}

1385

1171

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1391

1172

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

1173

perror("mkdtemp");

1394

1174

goto end;

1395

1175

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1176

tempdir_created = true;

1400

1177

1401

1178

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

1402

1179

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

1406

1183

gpgme_initialized = true;

1407

1184

}

1408

1185

1409

if(quit_now){

1410

goto end;

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

1411

1193

}

1412

1194

1413

1195

if(connect_to != NULL){

1419

1201

exitcode = EXIT_FAILURE;

1420

1202

goto end;

1421

1203

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1427

1204

uint16_t port;

1428

1205

errno = 0;

1429

1206

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

1433

1210

exitcode = EXIT_FAILURE;

1434

1211

goto end;

1435

1212

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1441

1213

port = (uint16_t)tmpmax;

1442

1214

*address = '\0';

1443

1215

address = connect_to;

1448

1220

} else {

1449

1221

af = AF_INET;

1450

1222

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1456

1223

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

1457

1224

if(ret < 0){

1458

1225

exitcode = EXIT_FAILURE;

1461

1228

}

1462

1229

goto end;

1463

1230

}

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1231

1469

1232

{

1470

1233

AvahiServerConfig config;

1471

1234

/* Do not publish any local Zeroconf records */

1492

1255

goto end;

1493

1256

}

1494

1257

1495

if(quit_now){

1496

goto end;

1497

}

1498

1499

1258

/* Create the Avahi service browser */

1500

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1502

1261

NULL, 0, browse_callback, NULL);

1503

1262

if(sb == NULL){

1504

1263

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

1507

1266

goto end;

1508

1267

}

1509

1268

1510

if(quit_now){

1511

goto end;

1512

}

1513

1514

1269

/* Run the main loop */

1515

1270

1516

1271

if(debug){

1545

1300

gpgme_release(mc.ctx);

1546

1301

}

1547

1302

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1580

1303

/* Removes the temp directory used by GPGME */

1581

1304

if(tempdir_created){

1582

1305

DIR *d;

1621

1344

}

1622

1345

}

1623

1346

1624

if(quit_now){

1625

sigemptyset(&old_sigterm_action.sa_mask);

1626

old_sigterm_action.sa_handler = SIG_DFL;

1627

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1628

&old_sigterm_action,

1629

NULL));

1630

if(ret == -1){

1631

perror("sigaction");

1632

}

1633

do {

1634

ret = raise(signal_received);

1635

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

1636

if(ret != 0){

1637

perror("raise");

1638

abort();

1639

}

1640

TEMP_FAILURE_RETRY(pause());

1641

}

1642

1643

1347

return exitcode;

1644

1348

}