/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() */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

85

81

86

82

#ifdef __linux__

87

83

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

125

121

static const char mandos_protocol_version[] = "1";

126

122

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

127

123

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

124

131

125

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

132

126

typedef struct {

144

138

.dh_bits = 1024, .priority = "SECURE256"

145

139

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

146

140

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

141

/*

151

142

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

152

143

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

169

160

*/

170

161

static bool init_gpgme(const char *seckey,

171

162

const char *pubkey, const char *tempdir){

163

int ret;

172

164

gpgme_error_t rc;

173

165

gpgme_engine_info_t engine_info;

174

166

177

169

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

178

170

*/

179

171

bool import_key(const char *filename){

180

int ret;

181

172

int fd;

182

173

gpgme_data_t pgp_data;

183

174

254

245

return false;

255

246

}

256

247

257

return true;

248

return true;

258

249

}

259

250

260

251

/*

314

305

}

315

306

gpgme_recipient_t recipient;

316

307

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;

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

}

325

318

}

326

319

}

327

320

}

479

472

static int init_gnutls_session(gnutls_session_t *session){

480

473

int ret;

481

474

/* 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);

475

ret = gnutls_init(session, GNUTLS_SERVER);

488

476

if(ret != GNUTLS_E_SUCCESS){

489

477

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

490

478

safer_gnutls_strerror(ret));

492

480

493

481

{

494

482

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);

483

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

502

484

if(ret != GNUTLS_E_SUCCESS){

503

485

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

504

486

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

508

490

}

509

491

}

510

492

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);

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

519

495

if(ret != GNUTLS_E_SUCCESS){

520

496

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

521

497

safer_gnutls_strerror(ret));

524

500

}

525

501

526

502

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

528

505

529

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

507

539

516

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

540

517

AvahiIfIndex if_index,

541

518

int af){

542

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

543

520

ssize_t sret;

544

521

union {

545

522

struct sockaddr_in in;

546

523

struct sockaddr_in6 in6;

547

524

} to;

548

525

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

550

527

size_t buffer_length = 0;

551

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

552

530

size_t written;

553

int retval = -1;

531

int retval = 0;

554

532

gnutls_session_t session;

555

533

int pf; /* Protocol family */

556

534

557

if(quit_now){

558

return -1;

559

}

560

561

535

switch(af){

562

536

case AF_INET6:

563

537

pf = PF_INET6;

583

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

558

if(tcp_sd < 0){

585

559

perror("socket");

586

goto mandos_end;

587

}

588

589

if(quit_now){

590

goto mandos_end;

560

return -1;

591

561

}

592

562

593

563

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

594

564

if(af == AF_INET6){

595

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

596

566

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

597

567

} else { /* IPv4 */

598

568

to.in.sin_family = (sa_family_t)af;

600

570

}

601

571

if(ret < 0 ){

602

572

perror("inet_pton");

603

goto mandos_end;

573

return -1;

604

574

}

605

575

if(ret == 0){

606

576

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

607

goto mandos_end;

577

return -1;

608

578

}

609

579

if(af == AF_INET6){

610

580

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

617

587

if(if_index == AVAHI_IF_UNSPEC){

618

588

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

619

589

" without a network interface\n");

620

goto mandos_end;

590

return -1;

621

591

}

622

592

/* Set the network interface number as scope */

623

593

to.in6.sin6_scope_id = (uint32_t)if_index;

628

598

-Wunreachable-code */

629

599

}

630

600

631

if(quit_now){

632

goto mandos_end;

633

}

634

635

601

if(debug){

636

602

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

637

603

char interface[IF_NAMESIZE];

664

630

}

665

631

}

666

632

667

if(quit_now){

668

goto mandos_end;

669

}

670

671

633

if(af == AF_INET6){

672

634

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

673

635

} else {

675

637

}

676

638

if(ret < 0){

677

639

perror("connect");

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

640

return -1;

683

641

}

684

642

685

643

const char *out = mandos_protocol_version;

690

648

out_size - written));

691

649

if(ret == -1){

692

650

perror("write");

651

retval = -1;

693

652

goto mandos_end;

694

653

}

695

654

written += (size_t)ret;

703

662

break;

704

663

}

705

664

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

710

665

}

711

666

712

667

if(debug){

713

668

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

714

669

}

715

670

716

if(quit_now){

717

goto mandos_end;

718

}

719

720

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

672

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

673

do{

727

674

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

731

675

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

732

676

733

677

if(ret != GNUTLS_E_SUCCESS){

735

679

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

736

680

gnutls_perror(ret);

737

681

}

682

retval = -1;

738

683

goto mandos_end;

739

684

}

740

685

746

691

}

747

692

748

693

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

694

buffer_capacity = incbuffer(&buffer, buffer_length,

755

695

buffer_capacity);

756

696

if(buffer_capacity == 0){

757

697

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

698

retval = -1;

762

699

goto mandos_end;

763

700

}

764

701

773

710

case GNUTLS_E_AGAIN:

774

711

break;

775

712

case GNUTLS_E_REHANDSHAKE:

776

do {

713

do{

777

714

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

782

715

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

783

716

if(ret < 0){

784

717

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

785

718

gnutls_perror(ret);

719

retval = -1;

786

720

goto mandos_end;

787

721

}

788

722

break;

789

723

default:

790

724

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

791

725

" encrypted session with Mandos server\n");

726

retval = -1;

792

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

793

728

goto mandos_end;

794

729

}

801

736

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

802

737

}

803

738

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);

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

814

740

815

741

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

817

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

743

buffer_length,

819

744

&decrypted_buffer);

820

745

if(decrypted_buffer_size >= 0){

821

822

746

written = 0;

823

747

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

828

748

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

829

749

(size_t)decrypted_buffer_size - written,

830

750

stdout);

833

753

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

834

754

strerror(errno));

835

755

}

836

goto mandos_end;

756

retval = -1;

757

break;

837

758

}

838

759

written += (size_t)ret;

839

760

}

840

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

841

764

}

765

} else {

766

retval = -1;

842

767

}

843

768

844

769

/* Shutdown procedure */

845

770

846

771

mandos_end:

847

free(decrypted_buffer);

848

772

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

773

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

852

774

if(ret == -1){

853

775

perror("close");

854

776

}

855

777

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

778

return retval;

860

779

}

861

780

878

797

/* Called whenever a service has been resolved successfully or

879

798

timed out */

880

799

881

if(quit_now){

882

return;

883

}

884

885

800

switch(event){

886

801

default:

887

802

case AVAHI_RESOLVER_FAILURE:

924

839

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

925

840

is removed from the LAN */

926

841

927

if(quit_now){

928

return;

929

}

930

931

842

switch(event){

932

843

default:

933

844

case AVAHI_BROWSER_FAILURE:

943

854

the callback function is called the Avahi server will free the

944

855

resolver for us. */

945

856

946

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

947

name, type, domain, protocol, 0,

948

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)))

949

861

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

950

862

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

951

863

break;

962

874

}

963

875

}

964

876

877

sig_atomic_t quit_now = 0;

878

965

879

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

966

static void handle_sigterm(int sig){

880

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

967

881

if(quit_now){

968

882

return;

969

883

}

970

884

quit_now = 1;

971

signal_received = sig;

972

885

int old_errno = errno;

973

886

if(mc.simple_poll != NULL){

974

887

avahi_simple_poll_quit(mc.simple_poll);

976

889

errno = old_errno;

977

890

}

978

891

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);

1005

if(flagstring == NULL){

1006

perror("malloc");

1007

close(flags_fd);

1008

return 0;

1009

}

1010

while(to_read > 0){

1011

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

1012

(size_t)to_read));

1013

if(ssret == -1){

1014

perror("read");

1015

free(flagstring);

1016

close(flags_fd);

1017

return 0;

1018

}

1019

to_read -= ssret;

1020

if(ssret == 0){

1021

break;

1022

}

1023

}

1024

close(flags_fd);

1025

intmax_t tmpmax;

1026

char *tmp;

1027

errno = 0;

1028

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

1029

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

1030

and not (isspace(*tmp)))

1031

or tmpmax != (ifreq_flags)tmpmax){

1032

free(flagstring);

1033

return 0;

1034

}

1035

free(flagstring);

1036

ifreq_flags flags = (ifreq_flags)tmpmax;

1037

/* Reject the loopback device */

1038

if(flags & IFF_LOOPBACK){

1039

return 0;

1040

}

1041

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

1042

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

1043

return 1;

1044

}

1045

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

1046

if(not (flags & IFF_BROADCAST)){

1047

return 0;

1048

}

1049

/* Accept this device */

1050

return 1;

1051

}

1052

1053

892

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

1054

893

AvahiSServiceBrowser *sb = NULL;

1055

894

int error;

1057

896

intmax_t tmpmax;

1058

897

char *tmp;

1059

898

int exitcode = EXIT_SUCCESS;

1060

const char *interface = "";

899

const char *interface = "eth0";

1061

900

struct ifreq network;

1062

int sd = -1;

1063

bool take_down_interface = false;

901

int sd;

1064

902

uid_t uid;

1065

903

gid_t gid;

904

char *connect_to = NULL;

1066

905

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

1067

906

bool tempdir_created = false;

1068

907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1069

908

const char *seckey = PATHDIR "/" SECKEY;

1070

909

const char *pubkey = PATHDIR "/" PUBKEY;

1071

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" };

1072

915

bool gnutls_initialized = false;

1073

916

bool gpgme_initialized = false;

1074

917

float delay = 2.5f;

1075

918

1076

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

struct sigaction old_sigterm_action;

1077

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1078

921

1079

uid = getuid();

1080

gid = getgid();

1081

1082

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

1083

errno = 0;

1084

ret = setgid(gid);

1085

if(ret == -1){

1086

perror("setgid");

1087

}

1088

1089

/* Lower user privileges (temporarily) */

1090

errno = 0;

1091

ret = seteuid(uid);

1092

if(ret == -1){

1093

perror("seteuid");

1094

}

1095

1096

if(quit_now){

1097

goto end;

1098

}

1099

1100

922

{

1101

923

struct argp_option options[] = {

1102

924

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

1198

1020

if(not debug){

1199

1021

avahi_set_log_function(empty_log);

1200

1022

}

1201

1202

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

1203

struct dirent **direntries;

1204

ret = scandir(sys_class_net, &direntries, good_interface,

1205

alphasort);

1206

if(ret >= 1){

1207

/* Pick the first good interface */

1208

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

1209

if(interface == NULL){

1210

perror("malloc");

1211

free(direntries);

1212

exitcode = EXIT_FAILURE;

1213

goto end;

1214

}

1215

free(direntries);

1216

} else {

1217

free(direntries);

1218

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

1219

exitcode = EXIT_FAILURE;

1220

goto end;

1221

}

1222

}

1223

1023

1224

1024

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

1225

1025

from the signal handler */

1251

1051

exitcode = EXIT_FAILURE;

1252

1052

goto end;

1253

1053

}

1254

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

1255

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

1256

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

1257

*/

1258

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

1259

if(ret == -1){

1260

perror("sigaction");

1261

return EXIT_FAILURE;

1262

}

1263

if(old_sigterm_action.sa_handler != SIG_IGN){

1264

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

1265

if(ret == -1){

1266

perror("sigaction");

1267

exitcode = EXIT_FAILURE;

1268

goto end;

1269

}

1270

}

1271

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

1272

if(ret == -1){

1273

perror("sigaction");

1274

return EXIT_FAILURE;

1275

}

1276

if(old_sigterm_action.sa_handler != SIG_IGN){

1277

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

1278

if(ret == -1){

1279

perror("sigaction");

1280

exitcode = EXIT_FAILURE;

1281

goto end;

1282

}

1283

}

1284

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

1285

if(ret == -1){

1286

perror("sigaction");

1287

return EXIT_FAILURE;

1288

}

1289

if(old_sigterm_action.sa_handler != SIG_IGN){

1290

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

1291

if(ret == -1){

1292

perror("sigaction");

1293

exitcode = EXIT_FAILURE;

1294

goto end;

1295

}

1296

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1297

1060

1298

1061

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

1299

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

1300

if_index = (AvahiIfIndex) if_nametoindex(interface);

1301

if(if_index == 0){

1302

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

1303

exitcode = EXIT_FAILURE;

1304

goto end;

1305

}

1306

1307

if(quit_now){

1308

goto end;

1309

}

1310

1311

/* Re-raise priviliges */

1312

errno = 0;

1313

ret = seteuid(0);

1314

if(ret == -1){

1315

perror("seteuid");

1316

}

1317

1062

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

1318

1063

#ifdef __linux__

1319

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1320

1065

messages to mess up the prompt */

1338

1083

}

1339

1084

}

1340

1085

#endif /* __linux__ */

1341

/* Lower privileges */

1342

errno = 0;

1343

ret = seteuid(uid);

1344

if(ret == -1){

1345

perror("seteuid");

1346

}

1347

1086

goto end;

1348

1087

}

1349

1088

strcpy(network.ifr_name, interface);

1359

1098

}

1360

1099

#endif /* __linux__ */

1361

1100

exitcode = EXIT_FAILURE;

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1101

goto end;

1369

1102

}

1370

1103

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

1371

1104

network.ifr_flags |= IFF_UP;

1372

take_down_interface = true;

1373

1105

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

1374

1106

if(ret == -1){

1375

take_down_interface = false;

1376

1107

perror("ioctl SIOCSIFFLAGS");

1377

1108

exitcode = EXIT_FAILURE;

1378

1109

#ifdef __linux__

1383

1114

}

1384

1115

}

1385

1116

#endif /* __linux__ */

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1392

1117

goto end;

1393

1118

}

1394

1119

}

1406

1131

perror("nanosleep");

1407

1132

}

1408

1133

}

1409

if(not take_down_interface){

1410

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

1411

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

1412

if(ret == -1){

1413

perror("close");

1414

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1415

1137

}

1416

1138

#ifdef __linux__

1417

1139

if(restore_loglevel){

1422

1144

}

1423

1145

}

1424

1146

#endif /* __linux__ */

1425

/* Lower privileges */

1426

errno = 0;

1427

if(take_down_interface){

1428

/* Lower privileges */

1429

ret = seteuid(uid);

1430

if(ret == -1){

1431

perror("seteuid");

1432

}

1433

} else {

1434

/* Lower privileges permanently */

1435

ret = setuid(uid);

1436

if(ret == -1){

1437

perror("setuid");

1438

}

1439

}

1440

}

1441

1442

if(quit_now){

1443

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");

1444

1161

}

1445

1162

1446

1163

ret = init_gnutls_global(pubkey, seckey);

1452

1169

gnutls_initialized = true;

1453

1170

}

1454

1171

1455

if(quit_now){

1456

goto end;

1457

}

1458

1459

tempdir_created = true;

1460

1172

if(mkdtemp(tempdir) == NULL){

1461

tempdir_created = false;

1462

1173

perror("mkdtemp");

1463

1174

goto end;

1464

1175

}

1465

1466

if(quit_now){

1467

goto end;

1468

}

1176

tempdir_created = true;

1469

1177

1470

1178

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

1471

1179

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

1475

1183

gpgme_initialized = true;

1476

1184

}

1477

1185

1478

if(quit_now){

1479

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

}

1480

1193

}

1481

1194

1482

1195

if(connect_to != NULL){

1488

1201

exitcode = EXIT_FAILURE;

1489

1202

goto end;

1490

1203

}

1491

1492

if(quit_now){

1493

goto end;

1494

}

1495

1496

1204

uint16_t port;

1497

1205

errno = 0;

1498

1206

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

1502

1210

exitcode = EXIT_FAILURE;

1503

1211

goto end;

1504

1212

}

1505

1506

if(quit_now){

1507

goto end;

1508

}

1509

1510

1213

port = (uint16_t)tmpmax;

1511

1214

*address = '\0';

1512

1215

address = connect_to;

1517

1220

} else {

1518

1221

af = AF_INET;

1519

1222

}

1520

1521

if(quit_now){

1522

goto end;

1523

}

1524

1525

1223

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

1526

1224

if(ret < 0){

1527

1225

exitcode = EXIT_FAILURE;

1530

1228

}

1531

1229

goto end;

1532

1230

}

1533

1534

if(quit_now){

1535

goto end;

1536

}

1537

1231

1538

1232

{

1539

1233

AvahiServerConfig config;

1540

1234

/* Do not publish any local Zeroconf records */

1561

1255

goto end;

1562

1256

}

1563

1257

1564

if(quit_now){

1565

goto end;

1566

}

1567

1568

1258

/* Create the Avahi service browser */

1569

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

1570

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1571

1261

NULL, 0, browse_callback, NULL);

1572

1262

if(sb == NULL){

1573

1263

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

1576

1266

goto end;

1577

1267

}

1578

1268

1579

if(quit_now){

1580

goto end;

1581

}

1582

1583

1269

/* Run the main loop */

1584

1270

1585

1271

if(debug){

1614

1300

gpgme_release(mc.ctx);

1615

1301

}

1616

1302

1617

/* Take down the network interface */

1618

if(take_down_interface){

1619

/* Re-raise priviliges */

1620

errno = 0;

1621

ret = seteuid(0);

1622

if(ret == -1){

1623

perror("seteuid");

1624

}

1625

if(geteuid() == 0){

1626

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

1627

if(ret == -1){

1628

perror("ioctl SIOCGIFFLAGS");

1629

} else if(network.ifr_flags & IFF_UP) {

1630

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

1631

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

1632

if(ret == -1){

1633

perror("ioctl SIOCSIFFLAGS");

1634

}

1635

}

1636

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

1637

if(ret == -1){

1638

perror("close");

1639

}

1640

/* Lower privileges permanently */

1641

errno = 0;

1642

ret = setuid(uid);

1643

if(ret == -1){

1644

perror("setuid");

1645

}

1646

}

1647

}

1648

1649

1303

/* Removes the temp directory used by GPGME */

1650

1304

if(tempdir_created){

1651

1305

DIR *d;

1690

1344

}

1691

1345

}

1692

1346

1693

if(quit_now){

1694

sigemptyset(&old_sigterm_action.sa_mask);

1695

old_sigterm_action.sa_handler = SIG_DFL;

1696

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1697

&old_sigterm_action,

1698

NULL));

1699

if(ret == -1){

1700

perror("sigaction");

1701

}

1702

do {

1703

ret = raise(signal_received);

1704

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

1705

if(ret != 0){

1706

perror("raise");

1707

abort();

1708

}

1709

TEMP_FAILURE_RETRY(pause());

1710

}

1711

1712

1347

return exitcode;

1713

1348

}