/mandos/trunk : revision 400

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

37

41

39

43

stdout, ferror(), remove() */

40

44

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

41

45

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

42

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

43

srand(), strtof() */

46

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

47

strtof(), abort() */

44

48

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

45

49

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

46

50

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

67

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

72

*/

69

73

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

70

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

71

setgid() */

74

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

75

setgid(), pause() */

72

76

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

73

77

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

74

78

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

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

82

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

81

87

82

88

#ifdef __linux__

83

89

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

138

144

.dh_bits = 1024, .priority = "SECURE256"

139

145

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

140

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

141

150

/*

142

151

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

143

152

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

160

169

*/

161

170

static bool init_gpgme(const char *seckey,

162

171

const char *pubkey, const char *tempdir){

163

int ret;

164

172

gpgme_error_t rc;

165

173

gpgme_engine_info_t engine_info;

166

174

169

177

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

170

178

*/

171

179

bool import_key(const char *filename){

180

int ret;

172

181

int fd;

173

182

gpgme_data_t pgp_data;

174

183

245

254

return false;

246

255

}

247

256

248

return true;

257

return true;

249

258

}

250

259

251

260

/*

305

314

}

306

315

gpgme_recipient_t recipient;

307

316

recipient = result->recipients;

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

}

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;

318

325

}

319

326

}

320

327

}

472

479

static int init_gnutls_session(gnutls_session_t *session){

473

480

int ret;

474

481

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

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);

476

488

if(ret != GNUTLS_E_SUCCESS){

477

489

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

478

490

safer_gnutls_strerror(ret));

480

492

481

493

{

482

494

const char *err;

483

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

484

502

if(ret != GNUTLS_E_SUCCESS){

485

503

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

486

504

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

490

508

}

491

509

}

492

510

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

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);

495

519

if(ret != GNUTLS_E_SUCCESS){

496

520

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

497

521

safer_gnutls_strerror(ret));

500

524

}

501

525

502

526

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

528

506

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

530

516

539

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

517

540

AvahiIfIndex if_index,

518

541

int af){

519

int ret, tcp_sd;

542

int ret, tcp_sd = -1;

520

543

ssize_t sret;

521

544

union {

522

545

struct sockaddr_in in;

523

546

struct sockaddr_in6 in6;

524

547

} to;

525

548

char *buffer = NULL;

526

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

527

550

size_t buffer_length = 0;

528

551

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

552

size_t written;

531

int retval = 0;

553

int retval = -1;

532

554

gnutls_session_t session;

533

555

int pf; /* Protocol family */

534

556

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

535

564

switch(af){

536

565

case AF_INET6:

537

566

pf = PF_INET6;

541

570

break;

542

571

default:

543

572

fprintf(stderr, "Bad address family: %d\n", af);

573

errno = EINVAL;

544

574

return -1;

545

575

}

546

576

556

586

557

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

588

if(tcp_sd < 0){

589

int e = errno;

559

590

perror("socket");

560

return -1;

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

561

598

}

562

599

563

600

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

564

601

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

602

to.in6.sin6_family = (sa_family_t)af;

566

603

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

567

604

} else { /* IPv4 */

568

605

to.in.sin_family = (sa_family_t)af;

569

606

ret = inet_pton(af, ip, &to.in.sin_addr);

570

607

}

571

608

if(ret < 0 ){

609

int e = errno;

572

610

perror("inet_pton");

573

return -1;

611

errno = e;

612

goto mandos_end;

574

613

}

575

614

if(ret == 0){

615

int e = errno;

576

616

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

577

return -1;

617

errno = e;

618

goto mandos_end;

578

619

}

579

620

if(af == AF_INET6){

580

621

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

587

628

if(if_index == AVAHI_IF_UNSPEC){

588

629

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

589

630

" without a network interface\n");

590

return -1;

631

errno = EINVAL;

632

goto mandos_end;

591

633

}

592

634

/* Set the network interface number as scope */

593

635

to.in6.sin6_scope_id = (uint32_t)if_index;

598

640

-Wunreachable-code */

599

641

}

600

642

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

601

648

if(debug){

602

649

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

603

650

char interface[IF_NAMESIZE];

630

677

}

631

678

}

632

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

633

685

if(af == AF_INET6){

634

686

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

635

687

} else {

636

688

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

637

689

}

638

690

if(ret < 0){

691

int e = errno;

639

692

perror("connect");

640

return -1;

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

641

700

}

642

701

643

702

const char *out = mandos_protocol_version;

647

706

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

648

707

out_size - written));

649

708

if(ret == -1){

709

int e = errno;

650

710

perror("write");

651

retval = -1;

711

errno = e;

652

712

goto mandos_end;

653

713

}

654

714

written += (size_t)ret;

662

722

break;

663

723

}

664

724

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

665

730

}

666

731

667

732

if(debug){

668

733

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

669

734

}

670

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

671

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

742

673

do{

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

674

749

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

675

754

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

676

755

677

756

if(ret != GNUTLS_E_SUCCESS){

679

758

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

680

759

gnutls_perror(ret);

681

760

}

682

retval = -1;

761

errno = EPROTO;

683

762

goto mandos_end;

684

763

}

685

764

691

770

}

692

771

693

772

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

694

779

buffer_capacity = incbuffer(&buffer, buffer_length,

695

780

buffer_capacity);

696

781

if(buffer_capacity == 0){

782

int e = errno;

697

783

perror("incbuffer");

698

retval = -1;

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

699

790

goto mandos_end;

700

791

}

701

792

710

801

case GNUTLS_E_AGAIN:

711

802

break;

712

803

case GNUTLS_E_REHANDSHAKE:

713

do{

804

do {

714

805

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

715

811

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

716

812

if(ret < 0){

717

813

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

718

814

gnutls_perror(ret);

719

retval = -1;

815

errno = EPROTO;

720

816

goto mandos_end;

721

817

}

722

818

break;

723

819

default:

724

820

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

725

821

" encrypted session with Mandos server\n");

726

retval = -1;

727

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

728

824

goto mandos_end;

729

825

}

730

826

} else {

736

832

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

737

833

}

738

834

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

740

847

741

848

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

742

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

851

buffer_length,

744

852

&decrypted_buffer);

745

853

if(decrypted_buffer_size >= 0){

854

746

855

written = 0;

747

856

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

748

862

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

749

863

(size_t)decrypted_buffer_size - written,

750

864

stdout);

751

865

if(ret == 0 and ferror(stdout)){

866

int e = errno;

752

867

if(debug){

753

868

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

754

869

strerror(errno));

755

870

}

756

retval = -1;

757

break;

871

errno = e;

872

goto mandos_end;

758

873

}

759

874

written += (size_t)ret;

760

875

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

876

retval = 0;

764

877

}

765

} else {

766

retval = -1;

767

878

}

768

879

769

880

/* Shutdown procedure */

770

881

771

882

mandos_end:

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

776

902

}

777

gnutls_deinit(session);

778

903

return retval;

779

904

}

780

905

797

922

/* Called whenever a service has been resolved successfully or

798

923

timed out */

799

924

925

if(quit_now){

926

return;

927

}

928

800

929

switch(event){

801

930

default:

802

931

case AVAHI_RESOLVER_FAILURE:

839

968

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

840

969

is removed from the LAN */

841

970

971

if(quit_now){

972

return;

973

}

974

842

975

switch(event){

843

976

default:

844

977

case AVAHI_BROWSER_FAILURE:

854

987

the callback function is called the Avahi server will free the

855

988

resolver for us. */

856

989

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

861

993

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

862

994

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

863

995

break;

874

1006

}

875

1007

}

876

1008

877

sig_atomic_t quit_now = 0;

878

879

1009

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

880

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

1010

static void handle_sigterm(int sig){

881

1011

if(quit_now){

882

1012

return;

883

1013

}

884

1014

quit_now = 1;

1015

signal_received = sig;

885

1016

int old_errno = errno;

886

1017

if(mc.simple_poll != NULL){

887

1018

avahi_simple_poll_quit(mc.simple_poll);

898

1029

int exitcode = EXIT_SUCCESS;

899

1030

const char *interface = "eth0";

900

1031

struct ifreq network;

901

int sd;

1032

int sd = -1;

1033

bool take_down_interface = false;

902

1034

uid_t uid;

903

1035

gid_t gid;

904

1036

char *connect_to = NULL;

908

1040

const char *seckey = PATHDIR "/" SECKEY;

909

1041

const char *pubkey = PATHDIR "/" PUBKEY;

910

1042

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" };

915

1043

bool gnutls_initialized = false;

916

1044

bool gpgme_initialized = false;

917

1045

float delay = 2.5f;

918

1046

919

struct sigaction old_sigterm_action;

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

920

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

921

1049

1050

uid = getuid();

1051

gid = getgid();

1052

1053

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

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

1070

922

1071

{

923

1072

struct argp_option options[] = {

924

1073

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

953

1102

.arg = "SECONDS",

954

1103

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

955

1104

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

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

1109

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

1110

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

1111

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

1112

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

1113

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

956

1114

{ .name = NULL }

957

1115

};

958

1116

959

1117

error_t parse_opt(int key, char *arg,

960

1118

struct argp_state *state){

1119

errno = 0;

961

1120

switch(key){

962

1121

case 128: /* --debug */

963

1122

debug = true;

979

1138

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

980

1139

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

981

1140

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

982

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

983

exit(EXIT_FAILURE);

1141

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

984

1142

}

985

1143

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

986

1144

break;

991

1149

errno = 0;

992

1150

delay = strtof(arg, &tmp);

993

1151

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

994

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

995

exit(EXIT_FAILURE);

1152

argp_error(state, "Bad delay");

996

1153

}

997

1154

break;

998

case ARGP_KEY_ARG:

999

argp_usage(state);

1000

case ARGP_KEY_END:

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

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

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

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

1166

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

1167

exit(argp_err_exit_status);

1001

1168

break;

1002

1169

default:

1003

1170

return ARGP_ERR_UNKNOWN;

1004

1171

}

1005

return 0;

1172

return errno;

1006

1173

}

1007

1174

1008

1175

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

1009

1176

.args_doc = "",

1010

1177

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

1011

1178

" passwords from a Mandos server" };

1012

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

1013

if(ret == ARGP_ERR_UNKNOWN){

1014

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

1015

exitcode = EXIT_FAILURE;

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

1016

1192

goto end;

1017

1193

}

1018

1194

}

1028

1204

mc.simple_poll = avahi_simple_poll_new();

1029

1205

if(mc.simple_poll == NULL){

1030

1206

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1031

exitcode = EXIT_FAILURE;

1207

exitcode = EX_UNAVAILABLE;

1032

1208

goto end;

1033

1209

}

1034

1210

1036

1212

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1037

1213

if(ret == -1){

1038

1214

perror("sigaddset");

1039

exitcode = EXIT_FAILURE;

1215

exitcode = EX_OSERR;

1040

1216

goto end;

1041

1217

}

1042

1218

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1043

1219

if(ret == -1){

1044

1220

perror("sigaddset");

1045

exitcode = EXIT_FAILURE;

1221

exitcode = EX_OSERR;

1046

1222

goto end;

1047

1223

}

1048

1224

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1049

1225

if(ret == -1){

1050

1226

perror("sigaddset");

1051

exitcode = EXIT_FAILURE;

1052

goto end;

1053

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1227

exitcode = EX_OSERR;

1228

goto end;

1229

}

1230

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

1231

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

1232

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

1233

*/

1234

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

1235

if(ret == -1){

1236

perror("sigaction");

1237

return EX_OSERR;

1238

}

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

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

1241

if(ret == -1){

1242

perror("sigaction");

1243

exitcode = EX_OSERR;

1244

goto end;

1245

}

1246

}

1247

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

1248

if(ret == -1){

1249

perror("sigaction");

1250

return EX_OSERR;

1251

}

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

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

1254

if(ret == -1){

1255

perror("sigaction");

1256

exitcode = EX_OSERR;

1257

goto end;

1258

}

1259

}

1260

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

1261

if(ret == -1){

1262

perror("sigaction");

1263

return EX_OSERR;

1264

}

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

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

1267

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1060

1273

1061

1274

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

1062

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1063

1294

#ifdef __linux__

1064

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1065

messages to mess up the prompt */

1296

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

1066

1297

ret = klogctl(8, NULL, 5);

1067

1298

bool restore_loglevel = true;

1068

1299

if(ret == -1){

1074

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1075

1306

if(sd < 0){

1076

1307

perror("socket");

1077

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1078

1309

#ifdef __linux__

1079

1310

if(restore_loglevel){

1080

1311

ret = klogctl(7, NULL, 0);

1083

1314

}

1084

1315

}

1085

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1086

1323

goto end;

1087

1324

}

1088

1325

strcpy(network.ifr_name, interface);

1097

1334

}

1098

1335

}

1099

1336

#endif /* __linux__ */

1100

exitcode = EXIT_FAILURE;

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1101

1344

goto end;

1102

1345

}

1103

1346

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

1104

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1105

1349

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

1106

1350

if(ret == -1){

1351

take_down_interface = false;

1107

1352

perror("ioctl SIOCSIFFLAGS");

1108

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1109

1354

#ifdef __linux__

1110

1355

if(restore_loglevel){

1111

1356

ret = klogctl(7, NULL, 0);

1114

1359

}

1115

1360

}

1116

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1117

1368

goto end;

1118

1369

}

1119

1370

}

1131

1382

perror("nanosleep");

1132

1383

}

1133

1384

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1137

1391

}

1138

1392

#ifdef __linux__

1139

1393

if(restore_loglevel){

1144

1398

}

1145

1399

}

1146

1400

#endif /* __linux__ */

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");

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1416

}

1417

1418

if(quit_now){

1419

goto end;

1161

1420

}

1162

1421

1163

1422

ret = init_gnutls_global(pubkey, seckey);

1164

1423

if(ret == -1){

1165

1424

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

1166

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1167

1426

goto end;

1168

1427

} else {

1169

1428

gnutls_initialized = true;

1170

1429

}

1171

1430

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1172

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1173

1438

perror("mkdtemp");

1174

1439

goto end;

1175

1440

}

1176

tempdir_created = true;

1441

1442

if(quit_now){

1443

goto end;

1444

}

1177

1445

1178

1446

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

1179

1447

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

1180

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1181

1449

goto end;

1182

1450

} else {

1183

1451

gpgme_initialized = true;

1184

1452

}

1185

1453

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

}

1454

if(quit_now){

1455

goto end;

1193

1456

}

1194

1457

1195

1458

if(connect_to != NULL){

1198

1461

char *address = strrchr(connect_to, ':');

1199

1462

if(address == NULL){

1200

1463

fprintf(stderr, "No colon in address\n");

1201

exitcode = EXIT_FAILURE;

1202

goto end;

1203

}

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1204

1472

uint16_t port;

1205

1473

errno = 0;

1206

1474

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

1207

1475

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1208

1476

or tmpmax != (uint16_t)tmpmax){

1209

1477

fprintf(stderr, "Bad port number\n");

1210

exitcode = EXIT_FAILURE;

1211

goto end;

1212

}

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1213

1486

port = (uint16_t)tmpmax;

1214

1487

*address = '\0';

1215

1488

address = connect_to;

1220

1493

} else {

1221

1494

af = AF_INET;

1222

1495

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1223

1501

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

1224

1502

if(ret < 0){

1225

exitcode = EXIT_FAILURE;

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1226

1522

} else {

1227

1523

exitcode = EXIT_SUCCESS;

1228

1524

}

1229

1525

goto end;

1230

1526

}

1231

1527

1528

if(quit_now){

1529

goto end;

1530

}

1531

1232

1532

{

1233

1533

AvahiServerConfig config;

1234

1534

/* Do not publish any local Zeroconf records */

1251

1551

if(mc.server == NULL){

1252

1552

fprintf(stderr, "Failed to create Avahi server: %s\n",

1253

1553

avahi_strerror(error));

1254

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1255

1559

goto end;

1256

1560

}

1257

1561

1258

1562

/* Create the Avahi service browser */

1259

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1261

1565

NULL, 0, browse_callback, NULL);

1262

1566

if(sb == NULL){

1263

1567

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

1264

1568

avahi_strerror(avahi_server_errno(mc.server)));

1265

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1266

1574

goto end;

1267

1575

}

1268

1576

1300

1608

gpgme_release(mc.ctx);

1301

1609

}

1302

1610

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1303

1643

/* Removes the temp directory used by GPGME */

1304

1644

if(tempdir_created){

1305

1645

DIR *d;

1344

1684

}

1345

1685

}

1346

1686

1687

if(quit_now){

1688

sigemptyset(&old_sigterm_action.sa_mask);

1689

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1693

if(ret == -1){

1694

perror("sigaction");

1695

}

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1704

}

1705

1347

1706

return exitcode;

1348

1707

}