/mandos/release : revision 237.2.103

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() */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

85

86

#ifdef __linux__

87

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

125

static const char mandos_protocol_version[] = "1";

126

const char *argp_program_version = "mandos-client " VERSION;

127

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

128

static const char sys_class_net[] = "/sys/class/net";

129

char *connect_to = NULL;

130

128

131

129

/* Used for passing in values through the Avahi callback functions */

132

130

typedef struct {

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

169

164

*/

170

165

static bool init_gpgme(const char *seckey,

171

166

const char *pubkey, const char *tempdir){

167

int ret;

172

168

gpgme_error_t rc;

173

169

gpgme_engine_info_t engine_info;

174

170

177

173

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

178

174

*/

179

175

bool import_key(const char *filename){

180

int ret;

181

176

int fd;

182

177

gpgme_data_t pgp_data;

183

178

254

249

return false;

255

250

}

256

251

257

return true;

252

return true;

258

253

}

259

254

260

255

/*

314

309

}

315

310

gpgme_recipient_t recipient;

316

311

recipient = result->recipients;

317

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

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

}

325

322

}

326

323

}

327

324

}

479

476

static int init_gnutls_session(gnutls_session_t *session){

480

477

int ret;

481

478

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

479

ret = gnutls_init(session, GNUTLS_SERVER);

488

480

if(ret != GNUTLS_E_SUCCESS){

489

481

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

490

482

safer_gnutls_strerror(ret));

492

484

493

485

{

494

486

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

487

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

502

488

if(ret != GNUTLS_E_SUCCESS){

503

489

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

504

490

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

508

494

}

509

495

}

510

496

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

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

519

499

if(ret != GNUTLS_E_SUCCESS){

520

500

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

521

501

safer_gnutls_strerror(ret));

524

504

}

525

505

526

506

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

528

509

529

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

511

539

520

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

540

521

AvahiIfIndex if_index,

541

522

int af){

542

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

543

524

ssize_t sret;

544

525

union {

545

526

struct sockaddr_in in;

546

527

struct sockaddr_in6 in6;

547

528

} to;

548

529

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

550

531

size_t buffer_length = 0;

551

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

552

534

size_t written;

553

int retval = -1;

535

int retval = 0;

554

536

gnutls_session_t session;

555

537

int pf; /* Protocol family */

556

538

557

if(quit_now){

558

return -1;

559

}

560

561

539

switch(af){

562

540

case AF_INET6:

563

541

pf = PF_INET6;

583

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

562

if(tcp_sd < 0){

585

563

perror("socket");

586

goto mandos_end;

587

}

588

589

if(quit_now){

590

goto mandos_end;

564

return -1;

591

565

}

592

566

593

567

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

600

574

}

601

575

if(ret < 0 ){

602

576

perror("inet_pton");

603

goto mandos_end;

577

return -1;

604

578

}

605

579

if(ret == 0){

606

580

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

607

goto mandos_end;

581

return -1;

608

582

}

609

583

if(af == AF_INET6){

610

584

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

617

591

if(if_index == AVAHI_IF_UNSPEC){

618

592

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

619

593

" without a network interface\n");

620

goto mandos_end;

594

return -1;

621

595

}

622

596

/* Set the network interface number as scope */

623

597

to.in6.sin6_scope_id = (uint32_t)if_index;

628

602

-Wunreachable-code */

629

603

}

630

604

631

if(quit_now){

632

goto mandos_end;

633

}

634

635

605

if(debug){

636

606

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

637

607

char interface[IF_NAMESIZE];

664

634

}

665

635

}

666

636

667

if(quit_now){

668

goto mandos_end;

669

}

670

671

637

if(af == AF_INET6){

672

638

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

673

639

} else {

675

641

}

676

642

if(ret < 0){

677

643

perror("connect");

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

644

return -1;

683

645

}

684

646

685

647

const char *out = mandos_protocol_version;

690

652

out_size - written));

691

653

if(ret == -1){

692

654

perror("write");

655

retval = -1;

693

656

goto mandos_end;

694

657

}

695

658

written += (size_t)ret;

703

666

break;

704

667

}

705

668

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

710

669

}

711

670

712

671

if(debug){

713

672

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

714

673

}

715

674

716

if(quit_now){

717

goto mandos_end;

718

}

719

720

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

676

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

677

do{

727

678

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

731

679

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

732

680

733

681

if(ret != GNUTLS_E_SUCCESS){

735

683

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

736

684

gnutls_perror(ret);

737

685

}

686

retval = -1;

738

687

goto mandos_end;

739

688

}

740

689

746

695

}

747

696

748

697

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

698

buffer_capacity = incbuffer(&buffer, buffer_length,

755

699

buffer_capacity);

756

700

if(buffer_capacity == 0){

757

701

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

702

retval = -1;

762

703

goto mandos_end;

763

704

}

764

705

773

714

case GNUTLS_E_AGAIN:

774

715

break;

775

716

case GNUTLS_E_REHANDSHAKE:

776

do {

717

do{

777

718

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

782

719

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

783

720

if(ret < 0){

784

721

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

785

722

gnutls_perror(ret);

723

retval = -1;

786

724

goto mandos_end;

787

725

}

788

726

break;

789

727

default:

790

728

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

791

729

" encrypted session with Mandos server\n");

730

retval = -1;

792

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

793

732

goto mandos_end;

794

733

}

801

740

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

802

741

}

803

742

804

if(quit_now){

805

goto mandos_end;

806

}

807

808

do {

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

if(quit_now){

811

goto mandos_end;

812

}

813

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

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

814

744

815

745

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

817

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

747

buffer_length,

819

748

&decrypted_buffer);

820

749

if(decrypted_buffer_size >= 0){

821

822

750

written = 0;

823

751

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

828

752

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

829

753

(size_t)decrypted_buffer_size - written,

830

754

stdout);

833

757

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

834

758

strerror(errno));

835

759

}

836

goto mandos_end;

760

retval = -1;

761

break;

837

762

}

838

763

written += (size_t)ret;

839

764

}

840

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

841

768

}

769

} else {

770

retval = -1;

842

771

}

843

772

844

773

/* Shutdown procedure */

845

774

846

775

mandos_end:

847

free(decrypted_buffer);

848

776

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

777

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

852

778

if(ret == -1){

853

779

perror("close");

854

780

}

855

781

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

782

return retval;

860

783

}

861

784

878

801

/* Called whenever a service has been resolved successfully or

879

802

timed out */

880

803

881

if(quit_now){

882

return;

883

}

884

885

804

switch(event){

886

805

default:

887

806

case AVAHI_RESOLVER_FAILURE:

924

843

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

925

844

is removed from the LAN */

926

845

927

if(quit_now){

928

return;

929

}

930

931

846

switch(event){

932

847

default:

933

848

case AVAHI_BROWSER_FAILURE:

962

877

}

963

878

}

964

879

880

sig_atomic_t quit_now = 0;

881

965

882

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

966

static void handle_sigterm(int sig){

883

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

967

884

if(quit_now){

968

885

return;

969

886

}

970

887

quit_now = 1;

971

signal_received = sig;

972

888

int old_errno = errno;

973

889

if(mc.simple_poll != NULL){

974

890

avahi_simple_poll_quit(mc.simple_poll);

976

892

errno = old_errno;

977

893

}

978

894

979

/*

980

* This function determines if a directory entry in /sys/class/net

981

* corresponds to an acceptable network device.

982

* (This function is passed to scandir(3) as a filter function.)

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

if(if_entry->d_name[0] == '.'){

994

return 0;

995

}

996

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1002

/* read line from flags_fd */

1003

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1004

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1005

flagstring[(size_t)to_read] = '\0';

1006

if(flagstring == NULL){

1007

perror("malloc");

1008

close(flags_fd);

1009

return 0;

1010

}

1011

while(to_read > 0){

1012

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1013

(size_t)to_read));

1014

if(ssret == -1){

1015

perror("read");

1016

free(flagstring);

1017

close(flags_fd);

1018

return 0;

1019

}

1020

to_read -= ssret;

1021

if(ssret == 0){

1022

break;

1023

}

1024

}

1025

close(flags_fd);

1026

intmax_t tmpmax;

1027

char *tmp;

1028

errno = 0;

1029

tmpmax = strtoimax(flagstring, &tmp, 0);

1030

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

1031

and not (isspace(*tmp)))

1032

or tmpmax != (ifreq_flags)tmpmax){

1033

if(debug){

1034

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1035

flagstring, if_entry->d_name);

1036

}

1037

free(flagstring);

1038

return 0;

1039

}

1040

free(flagstring);

1041

ifreq_flags flags = (ifreq_flags)tmpmax;

1042

/* Reject the loopback device */

1043

if(flags & IFF_LOOPBACK){

1044

if(debug){

1045

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1046

if_entry->d_name);

1047

}

1048

return 0;

1049

}

1050

/* Accept point-to-point devices only if connect_to is specified */

1051

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1052

if(debug){

1053

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1054

if_entry->d_name);

1055

}

1056

return 1;

1057

}

1058

/* Otherwise, reject non-broadcast-capable devices */

1059

if(not (flags & IFF_BROADCAST)){

1060

if(debug){

1061

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1062

if_entry->d_name);

1063

}

1064

return 0;

1065

}

1066

/* Accept this device */

1067

if(debug){

1068

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1069

if_entry->d_name);

1070

}

1071

return 1;

1072

}

1073

1074

895

int main(int argc, char *argv[]){

1075

896

AvahiSServiceBrowser *sb = NULL;

1076

897

int error;

1078

899

intmax_t tmpmax;

1079

900

char *tmp;

1080

901

int exitcode = EXIT_SUCCESS;

1081

const char *interface = "";

902

const char *interface = "eth0";

1082

903

struct ifreq network;

1083

int sd = -1;

1084

bool take_down_interface = false;

904

int sd;

1085

905

uid_t uid;

1086

906

gid_t gid;

907

char *connect_to = NULL;

1087

908

char tempdir[] = "/tmp/mandosXXXXXX";

1088

909

bool tempdir_created = false;

1089

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1094

915

bool gpgme_initialized = false;

1095

916

float delay = 2.5f;

1096

917

1097

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1098

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1099

920

1100

uid = getuid();

1101

gid = getgid();

1102

1103

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

1104

errno = 0;

1105

ret = setgid(gid);

1106

if(ret == -1){

1107

perror("setgid");

1108

}

1109

1110

/* Lower user privileges (temporarily) */

1111

errno = 0;

1112

ret = seteuid(uid);

1113

if(ret == -1){

1114

perror("seteuid");

1115

}

1116

1117

if(quit_now){

1118

goto end;

1119

}

1120

1121

921

{

1122

922

struct argp_option options[] = {

1123

923

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

1219

1019

if(not debug){

1220

1020

avahi_set_log_function(empty_log);

1221

1021

}

1222

1223

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

1224

struct dirent **direntries;

1225

ret = scandir(sys_class_net, &direntries, good_interface,

1226

alphasort);

1227

if(ret >= 1){

1228

/* Pick the first good interface */

1229

interface = strdup(direntries[0]->d_name);

1230

if(debug){

1231

fprintf(stderr, "Using interface \"%s\"\n", interface);

1232

}

1233

if(interface == NULL){

1234

perror("malloc");

1235

free(direntries);

1236

exitcode = EXIT_FAILURE;

1237

goto end;

1238

}

1239

free(direntries);

1240

} else {

1241

free(direntries);

1242

fprintf(stderr, "Could not find a network interface\n");

1243

exitcode = EXIT_FAILURE;

1244

goto end;

1245

}

1246

}

1247

1022

1248

1023

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1249

1024

from the signal handler */

1275

1050

exitcode = EXIT_FAILURE;

1276

1051

goto end;

1277

1052

}

1278

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

1279

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

1280

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

1281

*/

1282

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

1283

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1286

}

1287

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

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

1289

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1292

goto end;

1293

}

1294

}

1295

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

1296

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1299

}

1300

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

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

1302

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1305

goto end;

1306

}

1307

}

1308

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

1309

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1312

}

1313

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

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

1315

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1318

goto end;

1319

}

1320

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1321

1059

1322

1060

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

1323

if(strcmp(interface, "none") != 0){

1324

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

if(if_index == 0){

1326

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

1327

exitcode = EXIT_FAILURE;

1328

goto end;

1329

}

1330

1331

if(quit_now){

1332

goto end;

1333

}

1334

1335

/* Re-raise priviliges */

1336

errno = 0;

1337

ret = seteuid(0);

1338

if(ret == -1){

1339

perror("seteuid");

1340

}

1341

1061

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

1342

1062

#ifdef __linux__

1343

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1344

1064

messages to mess up the prompt */

1362

1082

}

1363

1083

}

1364

1084

#endif /* __linux__ */

1365

/* Lower privileges */

1366

errno = 0;

1367

ret = seteuid(uid);

1368

if(ret == -1){

1369

perror("seteuid");

1370

}

1371

1085

goto end;

1372

1086

}

1373

1087

strcpy(network.ifr_name, interface);

1383

1097

}

1384

1098

#endif /* __linux__ */

1385

1099

exitcode = EXIT_FAILURE;

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1392

1100

goto end;

1393

1101

}

1394

1102

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

1395

1103

network.ifr_flags |= IFF_UP;

1396

take_down_interface = true;

1397

1104

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

1398

1105

if(ret == -1){

1399

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1106

perror("ioctl SIOCSIFFLAGS");

1401

1107

exitcode = EXIT_FAILURE;

1402

1108

#ifdef __linux__

1403

1109

if(restore_loglevel){

1407

1113

}

1408

1114

}

1409

1115

#endif /* __linux__ */

1410

/* Lower privileges */

1411

errno = 0;

1412

ret = seteuid(uid);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1116

goto end;

1417

1117

}

1418

1118

}

1430

1130

perror("nanosleep");

1431

1131

}

1432

1132

}

1433

if(not take_down_interface){

1434

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

1435

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

1436

if(ret == -1){

1437

perror("close");

1438

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1439

1136

}

1440

1137

#ifdef __linux__

1441

1138

if(restore_loglevel){

1446

1143

}

1447

1144

}

1448

1145

#endif /* __linux__ */

1449

/* Lower privileges */

1450

errno = 0;

1451

if(take_down_interface){

1452

/* Lower privileges */

1453

ret = seteuid(uid);

1454

if(ret == -1){

1455

perror("seteuid");

1456

}

1457

} else {

1458

/* Lower privileges permanently */

1459

ret = setuid(uid);

1460

if(ret == -1){

1461

perror("setuid");

1462

}

1463

}

1464

}

1465

1466

if(quit_now){

1467

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");

1468

1160

}

1469

1161

1470

1162

ret = init_gnutls_global(pubkey, seckey);

1476

1168

gnutls_initialized = true;

1477

1169

}

1478

1170

1479

if(quit_now){

1480

goto end;

1481

}

1482

1483

tempdir_created = true;

1484

1171

if(mkdtemp(tempdir) == NULL){

1485

tempdir_created = false;

1486

1172

perror("mkdtemp");

1487

1173

goto end;

1488

1174

}

1489

1490

if(quit_now){

1491

goto end;

1492

}

1175

tempdir_created = true;

1493

1176

1494

1177

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

1495

1178

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

1499

1182

gpgme_initialized = true;

1500

1183

}

1501

1184

1502

if(quit_now){

1503

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

}

1504

1192

}

1505

1193

1506

1194

if(connect_to != NULL){

1512

1200

exitcode = EXIT_FAILURE;

1513

1201

goto end;

1514

1202

}

1515

1516

if(quit_now){

1517

goto end;

1518

}

1519

1520

1203

uint16_t port;

1521

1204

errno = 0;

1522

1205

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

1526

1209

exitcode = EXIT_FAILURE;

1527

1210

goto end;

1528

1211

}

1529

1530

if(quit_now){

1531

goto end;

1532

}

1533

1534

1212

port = (uint16_t)tmpmax;

1535

1213

*address = '\0';

1536

1214

address = connect_to;

1541

1219

} else {

1542

1220

af = AF_INET;

1543

1221

}

1544

1545

if(quit_now){

1546

goto end;

1547

}

1548

1549

1222

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

1550

1223

if(ret < 0){

1551

1224

exitcode = EXIT_FAILURE;

1554

1227

}

1555

1228

goto end;

1556

1229

}

1557

1558

if(quit_now){

1559

goto end;

1560

}

1561

1230

1562

1231

{

1563

1232

AvahiServerConfig config;

1564

1233

/* Do not publish any local Zeroconf records */

1585

1254

goto end;

1586

1255

}

1587

1256

1588

if(quit_now){

1589

goto end;

1590

}

1591

1592

1257

/* Create the Avahi service browser */

1593

1258

sb = avahi_s_service_browser_new(mc.server, if_index,

1594

1259

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1600

1265

goto end;

1601

1266

}

1602

1267

1603

if(quit_now){

1604

goto end;

1605

}

1606

1607

1268

/* Run the main loop */

1608

1269

1609

1270

if(debug){

1638

1299

gpgme_release(mc.ctx);

1639

1300

}

1640

1301

1641

/* Take down the network interface */

1642

if(take_down_interface){

1643

/* Re-raise priviliges */

1644

errno = 0;

1645

ret = seteuid(0);

1646

if(ret == -1){

1647

perror("seteuid");

1648

}

1649

if(geteuid() == 0){

1650

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

1651

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_UP) {

1654

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

1655

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

1656

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1658

}

1659

}

1660

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

1661

if(ret == -1){

1662

perror("close");

1663

}

1664

/* Lower privileges permanently */

1665

errno = 0;

1666

ret = setuid(uid);

1667

if(ret == -1){

1668

perror("setuid");

1669

}

1670

}

1671

}

1672

1673

1302

/* Removes the temp directory used by GPGME */

1674

1303

if(tempdir_created){

1675

1304

DIR *d;

1714

1343

}

1715

1344

}

1716

1345

1717

if(quit_now){

1718

sigemptyset(&old_sigterm_action.sa_mask);

1719

old_sigterm_action.sa_handler = SIG_DFL;

1720

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1721

&old_sigterm_action,

1722

NULL));

1723

if(ret == -1){

1724

perror("sigaction");

1725

}

1726

do {

1727

ret = raise(signal_received);

1728

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

1729

if(ret != 0){

1730

perror("raise");

1731

abort();

1732

}

1733

TEMP_FAILURE_RETRY(pause());

1734

}

1735

1736

1346

return exitcode;

1737

1347

}