/mandos/release : revision 237.2.81

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(), abort() */

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 */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

86

85

87

86

#ifdef __linux__

88

87

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

143

142

.dh_bits = 1024, .priority = "SECURE256"

144

143

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

145

144

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

149

145

/*

150

146

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

151

147

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

168

164

*/

169

165

static bool init_gpgme(const char *seckey,

170

166

const char *pubkey, const char *tempdir){

167

int ret;

171

168

gpgme_error_t rc;

172

169

gpgme_engine_info_t engine_info;

173

170

176

173

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

177

174

*/

178

175

bool import_key(const char *filename){

179

int ret;

180

176

int fd;

181

177

gpgme_data_t pgp_data;

182

178

253

249

return false;

254

250

}

255

251

256

return true;

252

return true;

257

253

}

258

254

259

255

/*

313

309

}

314

310

gpgme_recipient_t recipient;

315

311

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;

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

}

324

322

}

325

323

}

326

324

}

478

476

static int init_gnutls_session(gnutls_session_t *session){

479

477

int ret;

480

478

/* 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);

479

ret = gnutls_init(session, GNUTLS_SERVER);

487

480

if(ret != GNUTLS_E_SUCCESS){

488

481

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

489

482

safer_gnutls_strerror(ret));

491

484

492

485

{

493

486

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);

487

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

501

488

if(ret != GNUTLS_E_SUCCESS){

502

489

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

503

490

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

507

494

}

508

495

}

509

496

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);

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

518

499

if(ret != GNUTLS_E_SUCCESS){

519

500

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

520

501

safer_gnutls_strerror(ret));

523

504

}

524

505

525

506

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

527

509

528

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

511

538

520

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

539

521

AvahiIfIndex if_index,

540

522

int af){

541

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

542

524

ssize_t sret;

543

525

union {

544

526

struct sockaddr_in in;

545

527

struct sockaddr_in6 in6;

546

528

} to;

547

529

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

549

531

size_t buffer_length = 0;

550

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

551

534

size_t written;

552

int retval = -1;

535

int retval = 0;

553

536

gnutls_session_t session;

554

537

int pf; /* Protocol family */

555

538

556

if(quit_now){

557

return -1;

558

}

559

560

539

switch(af){

561

540

case AF_INET6:

562

541

pf = PF_INET6;

582

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

583

562

if(tcp_sd < 0){

584

563

perror("socket");

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

goto mandos_end;

564

return -1;

590

565

}

591

566

592

567

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

593

568

if(af == AF_INET6){

594

to.in6.sin6_family = (sa_family_t)af;

569

to.in6.sin6_family = (uint16_t)af;

595

570

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

596

571

} else { /* IPv4 */

597

572

to.in.sin_family = (sa_family_t)af;

599

574

}

600

575

if(ret < 0 ){

601

576

perror("inet_pton");

602

goto mandos_end;

577

return -1;

603

578

}

604

579

if(ret == 0){

605

580

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

606

goto mandos_end;

581

return -1;

607

582

}

608

583

if(af == AF_INET6){

609

584

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

616

591

if(if_index == AVAHI_IF_UNSPEC){

617

592

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

618

593

" without a network interface\n");

619

goto mandos_end;

594

return -1;

620

595

}

621

596

/* Set the network interface number as scope */

622

597

to.in6.sin6_scope_id = (uint32_t)if_index;

627

602

-Wunreachable-code */

628

603

}

629

604

630

if(quit_now){

631

goto mandos_end;

632

}

633

634

605

if(debug){

635

606

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

636

607

char interface[IF_NAMESIZE];

663

634

}

664

635

}

665

636

666

if(quit_now){

667

goto mandos_end;

668

}

669

670

637

if(af == AF_INET6){

671

638

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

672

639

} else {

674

641

}

675

642

if(ret < 0){

676

643

perror("connect");

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

644

return -1;

682

645

}

683

646

684

647

const char *out = mandos_protocol_version;

689

652

out_size - written));

690

653

if(ret == -1){

691

654

perror("write");

655

retval = -1;

692

656

goto mandos_end;

693

657

}

694

658

written += (size_t)ret;

702

666

break;

703

667

}

704

668

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

709

669

}

710

670

711

671

if(debug){

712

672

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

713

673

}

714

674

715

if(quit_now){

716

goto mandos_end;

717

}

718

719

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

720

676

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

677

do{

726

678

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

730

679

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

731

680

732

681

if(ret != GNUTLS_E_SUCCESS){

734

683

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

735

684

gnutls_perror(ret);

736

685

}

686

retval = -1;

737

687

goto mandos_end;

738

688

}

739

689

745

695

}

746

696

747

697

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

753

698

buffer_capacity = incbuffer(&buffer, buffer_length,

754

699

buffer_capacity);

755

700

if(buffer_capacity == 0){

756

701

perror("incbuffer");

757

goto mandos_end;

758

}

759

760

if(quit_now){

702

retval = -1;

761

703

goto mandos_end;

762

704

}

763

705

772

714

case GNUTLS_E_AGAIN:

773

715

break;

774

716

case GNUTLS_E_REHANDSHAKE:

775

do {

717

do{

776

718

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

781

719

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

782

720

if(ret < 0){

783

721

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

784

722

gnutls_perror(ret);

723

retval = -1;

785

724

goto mandos_end;

786

725

}

787

726

break;

788

727

default:

789

728

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

790

729

" encrypted session with Mandos server\n");

730

retval = -1;

791

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

792

732

goto mandos_end;

793

733

}

800

740

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

801

741

}

802

742

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);

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

813

744

814

745

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

816

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

817

747

buffer_length,

818

748

&decrypted_buffer);

819

749

if(decrypted_buffer_size >= 0){

820

821

750

written = 0;

822

751

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

827

752

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

828

753

(size_t)decrypted_buffer_size - written,

829

754

stdout);

832

757

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

833

758

strerror(errno));

834

759

}

835

goto mandos_end;

760

retval = -1;

761

break;

836

762

}

837

763

written += (size_t)ret;

838

764

}

839

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

840

768

}

769

} else {

770

retval = -1;

841

771

}

842

772

843

773

/* Shutdown procedure */

844

774

845

775

mandos_end:

846

free(decrypted_buffer);

847

776

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

777

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

851

778

if(ret == -1){

852

779

perror("close");

853

780

}

854

781

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

858

782

return retval;

859

783

}

860

784

877

801

/* Called whenever a service has been resolved successfully or

878

802

timed out */

879

803

880

if(quit_now){

881

return;

882

}

883

884

804

switch(event){

885

805

default:

886

806

case AVAHI_RESOLVER_FAILURE:

923

843

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

924

844

is removed from the LAN */

925

845

926

if(quit_now){

927

return;

928

}

929

930

846

switch(event){

931

847

default:

932

848

case AVAHI_BROWSER_FAILURE:

961

877

}

962

878

}

963

879

880

sig_atomic_t quit_now = 0;

881

964

882

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

965

static void handle_sigterm(int sig){

883

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

966

884

if(quit_now){

967

885

return;

968

886

}

969

887

quit_now = 1;

970

signal_received = sig;

971

888

int old_errno = errno;

972

889

if(mc.simple_poll != NULL){

973

890

avahi_simple_poll_quit(mc.simple_poll);

984

901

int exitcode = EXIT_SUCCESS;

985

902

const char *interface = "eth0";

986

903

struct ifreq network;

987

int sd = -1;

988

bool take_down_interface = false;

904

int sd;

989

905

uid_t uid;

990

906

gid_t gid;

991

907

char *connect_to = NULL;

999

915

bool gpgme_initialized = false;

1000

916

float delay = 2.5f;

1001

917

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1003

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1004

920

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

921

{

1027

922

struct argp_option options[] = {

1028

923

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

1057

952

.arg = "SECONDS",

1058

953

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

1059

954

.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

955

{ .name = NULL }

1070

956

};

1071

957

1072

958

error_t parse_opt(int key, char *arg,

1073

959

struct argp_state *state){

1074

errno = 0;

1075

960

switch(key){

1076

961

case 128: /* --debug */

1077

962

debug = true;

1093

978

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

1094

979

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

1095

980

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

1096

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

981

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

982

exit(EXIT_FAILURE);

1097

983

}

1098

984

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

1099

985

break;

1104

990

errno = 0;

1105

991

delay = strtof(arg, &tmp);

1106

992

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

1107

argp_error(state, "Bad delay");

993

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

994

exit(EXIT_FAILURE);

1108

995

}

1109

996

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);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1123

1000

break;

1124

1001

default:

1125

1002

return ARGP_ERR_UNKNOWN;

1126

1003

}

1127

return errno;

1004

return 0;

1128

1005

}

1129

1006

1130

1007

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

1131

1008

.args_doc = "",

1132

1009

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

1133

1010

" 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;

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;

1147

1015

goto end;

1148

1016

}

1149

1017

}

1182

1050

exitcode = EXIT_FAILURE;

1183

1051

goto end;

1184

1052

}

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

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1228

1059

1229

1060

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

1230

1061

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

1062

#ifdef __linux__

1250

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1251

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

1064

messages to mess up the prompt */

1252

1065

ret = klogctl(8, NULL, 5);

1253

1066

bool restore_loglevel = true;

1254

1067

if(ret == -1){

1269

1082

}

1270

1083

}

1271

1084

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1278

1085

goto end;

1279

1086

}

1280

1087

strcpy(network.ifr_name, interface);

1290

1097

}

1291

1098

#endif /* __linux__ */

1292

1099

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1299

1100

goto end;

1300

1101

}

1301

1102

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

1302

1103

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1304

1104

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

1305

1105

if(ret == -1){

1306

take_down_interface = false;

1307

1106

perror("ioctl SIOCSIFFLAGS");

1308

1107

exitcode = EXIT_FAILURE;

1309

1108

#ifdef __linux__

1314

1113

}

1315

1114

}

1316

1115

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1116

goto end;

1324

1117

}

1325

1118

}

1337

1130

perror("nanosleep");

1338

1131

}

1339

1132

}

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

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1346

1136

}

1347

1137

#ifdef __linux__

1348

1138

if(restore_loglevel){

1353

1143

}

1354

1144

}

1355

1145

#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;

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");

1375

1160

}

1376

1161

1377

1162

ret = init_gnutls_global(pubkey, seckey);

1383

1168

gnutls_initialized = true;

1384

1169

}

1385

1170

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1391

1171

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

1172

perror("mkdtemp");

1394

1173

goto end;

1395

1174

}

1396

1397

if(quit_now){

1398

goto end;

1399

}

1175

tempdir_created = true;

1400

1176

1401

1177

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

1402

1178

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

1406

1182

gpgme_initialized = true;

1407

1183

}

1408

1184

1409

if(quit_now){

1410

goto end;

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

}

1411

1192

}

1412

1193

1413

1194

if(connect_to != NULL){

1419

1200

exitcode = EXIT_FAILURE;

1420

1201

goto end;

1421

1202

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1427

1203

uint16_t port;

1428

1204

errno = 0;

1429

1205

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

1433

1209

exitcode = EXIT_FAILURE;

1434

1210

goto end;

1435

1211

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1441

1212

port = (uint16_t)tmpmax;

1442

1213

*address = '\0';

1443

1214

address = connect_to;

1448

1219

} else {

1449

1220

af = AF_INET;

1450

1221

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1456

1222

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

1457

1223

if(ret < 0){

1458

1224

exitcode = EXIT_FAILURE;

1461

1227

}

1462

1228

goto end;

1463

1229

}

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1230

1469

1231

{

1470

1232

AvahiServerConfig config;

1471

1233

/* Do not publish any local Zeroconf records */

1492

1254

goto end;

1493

1255

}

1494

1256

1495

if(quit_now){

1496

goto end;

1497

}

1498

1499

1257

/* Create the Avahi service browser */

1500

1258

sb = avahi_s_service_browser_new(mc.server, if_index,

1501

1259

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1507

1265

goto end;

1508

1266

}

1509

1267

1510

if(quit_now){

1511

goto end;

1512

}

1513

1514

1268

/* Run the main loop */

1515

1269

1516

1270

if(debug){

1545

1299

gpgme_release(mc.ctx);

1546

1300

}

1547

1301

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

1302

/* Removes the temp directory used by GPGME */

1581

1303

if(tempdir_created){

1582

1304

DIR *d;

1621

1343

}

1622

1344

}

1623

1345

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

1346

return exitcode;

1644

1347

}