/mandos/trunk : revision 395

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() */

47

srand(), 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 */

85

86

87

#ifdef __linux__

87

88

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

142

143

.dh_bits = 1024, .priority = "SECURE256"

143

144

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

144

145

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

145

149

/*

146

150

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

147

151

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

164

168

*/

165

169

static bool init_gpgme(const char *seckey,

166

170

const char *pubkey, const char *tempdir){

167

int ret;

168

171

gpgme_error_t rc;

169

172

gpgme_engine_info_t engine_info;

170

173

176

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

174

177

*/

175

178

bool import_key(const char *filename){

179

int ret;

176

180

int fd;

177

181

gpgme_data_t pgp_data;

178

182

249

253

return false;

250

254

}

251

255

252

return true;

256

return true;

253

257

}

254

258

255

259

/*

309

313

}

310

314

gpgme_recipient_t recipient;

311

315

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

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;

322

324

}

323

325

}

324

326

}

476

478

static int init_gnutls_session(gnutls_session_t *session){

477

479

int ret;

478

480

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

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);

480

487

if(ret != GNUTLS_E_SUCCESS){

481

488

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

482

489

safer_gnutls_strerror(ret));

484

491

485

492

{

486

493

const char *err;

487

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

488

501

if(ret != GNUTLS_E_SUCCESS){

489

502

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

490

503

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

494

507

}

495

508

}

496

509

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

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);

499

518

if(ret != GNUTLS_E_SUCCESS){

500

519

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

501

520

safer_gnutls_strerror(ret));

504

523

}

505

524

506

525

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

527

510

528

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

529

520

538

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

521

539

AvahiIfIndex if_index,

522

540

int af){

523

int ret, tcp_sd;

541

int ret, tcp_sd = -1;

524

542

ssize_t sret;

525

543

union {

526

544

struct sockaddr_in in;

527

545

struct sockaddr_in6 in6;

528

546

} to;

529

547

char *buffer = NULL;

530

char *decrypted_buffer;

548

char *decrypted_buffer = NULL;

531

549

size_t buffer_length = 0;

532

550

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

551

size_t written;

535

int retval = 0;

552

int retval = -1;

536

553

gnutls_session_t session;

537

554

int pf; /* Protocol family */

538

555

556

if(quit_now){

557

return -1;

558

}

559

539

560

switch(af){

540

561

case AF_INET6:

541

562

pf = PF_INET6;

561

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

583

if(tcp_sd < 0){

563

584

perror("socket");

564

return -1;

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

goto mandos_end;

565

590

}

566

591

567

592

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

568

593

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

594

to.in6.sin6_family = (sa_family_t)af;

570

595

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

571

596

} else { /* IPv4 */

572

597

to.in.sin_family = (sa_family_t)af;

574

599

}

575

600

if(ret < 0 ){

576

601

perror("inet_pton");

577

return -1;

602

goto mandos_end;

578

603

}

579

604

if(ret == 0){

580

605

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

581

return -1;

606

goto mandos_end;

582

607

}

583

608

if(af == AF_INET6){

584

609

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

591

616

if(if_index == AVAHI_IF_UNSPEC){

592

617

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

593

618

" without a network interface\n");

594

return -1;

619

goto mandos_end;

595

620

}

596

621

/* Set the network interface number as scope */

597

622

to.in6.sin6_scope_id = (uint32_t)if_index;

602

627

-Wunreachable-code */

603

628

}

604

629

630

if(quit_now){

631

goto mandos_end;

632

}

633

605

634

if(debug){

606

635

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

607

636

char interface[IF_NAMESIZE];

634

663

}

635

664

}

636

665

666

if(quit_now){

667

goto mandos_end;

668

}

669

637

670

if(af == AF_INET6){

638

671

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

639

672

} else {

641

674

}

642

675

if(ret < 0){

643

676

perror("connect");

644

return -1;

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

645

682

}

646

683

647

684

const char *out = mandos_protocol_version;

652

689

out_size - written));

653

690

if(ret == -1){

654

691

perror("write");

655

retval = -1;

656

692

goto mandos_end;

657

693

}

658

694

written += (size_t)ret;

666

702

break;

667

703

}

668

704

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

669

709

}

670

710

671

711

if(debug){

672

712

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

673

713

}

674

714

715

if(quit_now){

716

goto mandos_end;

717

}

718

675

719

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

720

677

do{

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

678

726

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

679

730

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

680

731

681

732

if(ret != GNUTLS_E_SUCCESS){

683

734

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

684

735

gnutls_perror(ret);

685

736

}

686

retval = -1;

687

737

goto mandos_end;

688

738

}

689

739

695

745

}

696

746

697

747

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

698

753

buffer_capacity = incbuffer(&buffer, buffer_length,

699

754

buffer_capacity);

700

755

if(buffer_capacity == 0){

701

756

perror("incbuffer");

702

retval = -1;

757

goto mandos_end;

758

}

759

760

if(quit_now){

703

761

goto mandos_end;

704

762

}

705

763

714

772

case GNUTLS_E_AGAIN:

715

773

break;

716

774

case GNUTLS_E_REHANDSHAKE:

717

do{

775

do {

718

776

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

719

781

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

720

782

if(ret < 0){

721

783

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

722

784

gnutls_perror(ret);

723

retval = -1;

724

785

goto mandos_end;

725

786

}

726

787

break;

727

788

default:

728

789

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

729

790

" encrypted session with Mandos server\n");

730

retval = -1;

731

791

gnutls_bye(session, GNUTLS_SHUT_RDWR);

732

792

goto mandos_end;

733

793

}

740

800

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

741

801

}

742

802

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

744

813

745

814

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

746

816

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

817

buffer_length,

748

818

&decrypted_buffer);

749

819

if(decrypted_buffer_size >= 0){

820

750

821

written = 0;

751

822

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

752

827

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

753

828

(size_t)decrypted_buffer_size - written,

754

829

stdout);

757

832

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

758

833

strerror(errno));

759

834

}

760

retval = -1;

761

break;

835

goto mandos_end;

762

836

}

763

837

written += (size_t)ret;

764

838

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

839

retval = 0;

768

840

}

769

} else {

770

retval = -1;

771

841

}

772

842

773

843

/* Shutdown procedure */

774

844

775

845

mandos_end:

846

free(decrypted_buffer);

776

847

free(buffer);

777

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

848

if(tcp_sd >= 0){

849

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

850

}

778

851

if(ret == -1){

779

852

perror("close");

780

853

}

781

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

782

858

return retval;

783

859

}

784

860

801

877

/* Called whenever a service has been resolved successfully or

802

878

timed out */

803

879

880

if(quit_now){

881

return;

882

}

883

804

884

switch(event){

805

885

default:

806

886

case AVAHI_RESOLVER_FAILURE:

843

923

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

844

924

is removed from the LAN */

845

925

926

if(quit_now){

927

return;

928

}

929

846

930

switch(event){

847

931

default:

848

932

case AVAHI_BROWSER_FAILURE:

877

961

}

878

962

}

879

963

880

sig_atomic_t quit_now = 0;

881

882

964

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

883

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

965

static void handle_sigterm(int sig){

884

966

if(quit_now){

885

967

return;

886

968

}

887

969

quit_now = 1;

970

signal_received = sig;

888

971

int old_errno = errno;

889

972

if(mc.simple_poll != NULL){

890

973

avahi_simple_poll_quit(mc.simple_poll);

901

984

int exitcode = EXIT_SUCCESS;

902

985

const char *interface = "eth0";

903

986

struct ifreq network;

904

int sd;

987

int sd = -1;

988

bool take_down_interface = false;

905

989

uid_t uid;

906

990

gid_t gid;

907

991

char *connect_to = NULL;

915

999

bool gpgme_initialized = false;

916

1000

float delay = 2.5f;

917

1001

918

struct sigaction old_sigterm_action;

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1004

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

921

1026

{

922

1027

struct argp_option options[] = {

923

1028

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

952

1057

.arg = "SECONDS",

953

1058

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

954

1059

.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 },

955

1069

{ .name = NULL }

956

1070

};

957

1071

958

1072

error_t parse_opt(int key, char *arg,

959

1073

struct argp_state *state){

1074

errno = 0;

960

1075

switch(key){

961

1076

case 128: /* --debug */

962

1077

debug = true;

978

1093

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

979

1094

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

980

1095

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

981

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

982

exit(EXIT_FAILURE);

1096

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

983

1097

}

984

1098

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

985

1099

break;

990

1104

errno = 0;

991

1105

delay = strtof(arg, &tmp);

992

1106

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

993

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

994

exit(EXIT_FAILURE);

1107

argp_error(state, "Bad delay");

995

1108

}

996

1109

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

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);

1000

1123

break;

1001

1124

default:

1002

1125

return ARGP_ERR_UNKNOWN;

1003

1126

}

1004

return 0;

1127

return errno;

1005

1128

}

1006

1129

1007

1130

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

1008

1131

.args_doc = "",

1009

1132

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

1010

1133

" passwords from a Mandos server" };

1011

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

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

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

1014

exitcode = EXIT_FAILURE;

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;

1015

1147

goto end;

1016

1148

}

1017

1149

}

1050

1182

exitcode = EXIT_FAILURE;

1051

1183

goto end;

1052

1184

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

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

}

1059

1228

1060

1229

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

1061

1230

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

1062

1249

#ifdef __linux__

1063

1250

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1251

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

1065

1252

ret = klogctl(8, NULL, 5);

1066

1253

bool restore_loglevel = true;

1067

1254

if(ret == -1){

1082

1269

}

1083

1270

}

1084

1271

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1085

1278

goto end;

1086

1279

}

1087

1280

strcpy(network.ifr_name, interface);

1097

1290

}

1098

1291

#endif /* __linux__ */

1099

1292

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1100

1299

goto end;

1101

1300

}

1102

1301

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

1103

1302

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1104

1304

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

1105

1305

if(ret == -1){

1306

take_down_interface = false;

1106

1307

perror("ioctl SIOCSIFFLAGS");

1107

1308

exitcode = EXIT_FAILURE;

1108

1309

#ifdef __linux__

1113

1314

}

1114

1315

}

1115

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1116

1323

goto end;

1117

1324

}

1118

1325

}

1130

1337

perror("nanosleep");

1131

1338

}

1132

1339

}

1133

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

1134

if(ret == -1){

1135

perror("close");

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

}

1136

1346

}

1137

1347

#ifdef __linux__

1138

1348

if(restore_loglevel){

1143

1353

}

1144

1354

}

1145

1355

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

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;

1160

1375

}

1161

1376

1162

1377

ret = init_gnutls_global(pubkey, seckey);

1168

1383

gnutls_initialized = true;

1169

1384

}

1170

1385

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1171

1391

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1172

1393

perror("mkdtemp");

1173

1394

goto end;

1174

1395

}

1175

tempdir_created = true;

1396

1397

if(quit_now){

1398

goto end;

1399

}

1176

1400

1177

1401

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

1178

1402

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

1182

1406

gpgme_initialized = true;

1183

1407

}

1184

1408

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1409

if(quit_now){

1410

goto end;

1192

1411

}

1193

1412

1194

1413

if(connect_to != NULL){

1200

1419

exitcode = EXIT_FAILURE;

1201

1420

goto end;

1202

1421

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1203

1427

uint16_t port;

1204

1428

errno = 0;

1205

1429

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

1209

1433

exitcode = EXIT_FAILURE;

1210

1434

goto end;

1211

1435

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1212

1441

port = (uint16_t)tmpmax;

1213

1442

*address = '\0';

1214

1443

address = connect_to;

1219

1448

} else {

1220

1449

af = AF_INET;

1221

1450

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1222

1456

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

1223

1457

if(ret < 0){

1224

1458

exitcode = EXIT_FAILURE;

1227

1461

}

1228

1462

goto end;

1229

1463

}

1230

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1231

1469

{

1232

1470

AvahiServerConfig config;

1233

1471

/* Do not publish any local Zeroconf records */

1254

1492

goto end;

1255

1493

}

1256

1494

1495

if(quit_now){

1496

goto end;

1497

}

1498

1257

1499

/* Create the Avahi service browser */

1258

1500

sb = avahi_s_service_browser_new(mc.server, if_index,

1259

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1265

1507

goto end;

1266

1508

}

1267

1509

1510

if(quit_now){

1511

goto end;

1512

}

1513

1268

1514

/* Run the main loop */

1269

1515

1270

1516

if(debug){

1299

1545

gpgme_release(mc.ctx);

1300

1546

}

1301

1547

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

1302

1580

/* Removes the temp directory used by GPGME */

1303

1581

if(tempdir_created){

1304

1582

DIR *d;

1343

1621

}

1344

1622

}

1345

1623

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

1346

1643

return exitcode;

1347

1644

}