/mandos/trunk : revision 24.1.136

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

42

38

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

45

42

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

46

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

47

strtof(), abort() */

43

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

44

srand() */

48

45

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

49

46

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

50

47

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

59

56

#include <fcntl.h> /* open() */

60

57

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

58

*/

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

59

#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */

64

60

#include <assert.h> /* assert() */

65

61

#include <errno.h> /* perror(), errno */

66

62

#include <time.h> /* nanosleep(), time() */

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() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

87

81

88

82

#ifdef __linux__

89

83

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

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

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

535

switch(af){

565

536

case AF_INET6:

566

537

pf = PF_INET6;

570

541

break;

571

542

default:

572

543

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

573

errno = EINVAL;

574

544

return -1;

575

545

}

576

546

586

556

587

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

558

if(tcp_sd < 0){

589

int e = errno;

590

559

perror("socket");

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

560

return -1;

598

561

}

599

562

600

563

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

601

564

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

603

566

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

604

567

} else { /* IPv4 */

605

568

to.in.sin_family = (sa_family_t)af;

606

569

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

607

570

}

608

571

if(ret < 0 ){

609

int e = errno;

610

572

perror("inet_pton");

611

errno = e;

612

goto mandos_end;

573

return -1;

613

574

}

614

575

if(ret == 0){

615

int e = errno;

616

576

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

617

errno = e;

618

goto mandos_end;

577

return -1;

619

578

}

620

579

if(af == AF_INET6){

621

580

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

628

587

if(if_index == AVAHI_IF_UNSPEC){

629

588

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

630

589

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

590

return -1;

633

591

}

634

592

/* Set the network interface number as scope */

635

593

to.in6.sin6_scope_id = (uint32_t)if_index;

640

598

-Wunreachable-code */

641

599

}

642

600

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

648

601

if(debug){

649

602

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

650

603

char interface[IF_NAMESIZE];

677

630

}

678

631

}

679

632

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

633

if(af == AF_INET6){

686

634

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

687

635

} else {

688

636

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

689

637

}

690

638

if(ret < 0){

691

int e = errno;

692

639

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

640

return -1;

700

641

}

701

642

702

643

const char *out = mandos_protocol_version;

706

647

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

707

648

out_size - written));

708

649

if(ret == -1){

709

int e = errno;

710

650

perror("write");

711

errno = e;

651

retval = -1;

712

652

goto mandos_end;

713

653

}

714

654

written += (size_t)ret;

722

662

break;

723

663

}

724

664

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

665

}

731

666

732

667

if(debug){

733

668

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

734

669

}

735

670

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

741

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

672

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

673

do{

749

674

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

754

675

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

755

676

756

677

if(ret != GNUTLS_E_SUCCESS){

758

679

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

759

680

gnutls_perror(ret);

760

681

}

761

errno = EPROTO;

682

retval = -1;

762

683

goto mandos_end;

763

684

}

764

685

770

691

}

771

692

772

693

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

694

buffer_capacity = incbuffer(&buffer, buffer_length,

780

695

buffer_capacity);

781

696

if(buffer_capacity == 0){

782

int e = errno;

783

697

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

698

retval = -1;

790

699

goto mandos_end;

791

700

}

792

701

801

710

case GNUTLS_E_AGAIN:

802

711

break;

803

712

case GNUTLS_E_REHANDSHAKE:

804

do {

713

do{

805

714

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

715

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

812

716

if(ret < 0){

813

717

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

814

718

gnutls_perror(ret);

815

errno = EPROTO;

719

retval = -1;

816

720

goto mandos_end;

817

721

}

818

722

break;

819

723

default:

820

724

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

821

725

" encrypted session with Mandos server\n");

726

retval = -1;

822

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

728

goto mandos_end;

825

729

}

826

730

} else {

832

736

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

833

737

}

834

738

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);

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

740

848

741

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

850

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

743

buffer_length,

852

744

&decrypted_buffer);

853

745

if(decrypted_buffer_size >= 0){

854

855

746

written = 0;

856

747

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

862

748

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

863

749

(size_t)decrypted_buffer_size - written,

864

750

stdout);

865

751

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

866

int e = errno;

867

752

if(debug){

868

753

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

869

754

strerror(errno));

870

755

}

871

errno = e;

872

goto mandos_end;

756

retval = -1;

757

break;

873

758

}

874

759

written += (size_t)ret;

875

760

}

876

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

877

764

}

765

} else {

766

retval = -1;

878

767

}

879

768

880

769

/* Shutdown procedure */

881

770

882

771

mandos_end:

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;

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

902

776

}

777

gnutls_deinit(session);

903

778

return retval;

904

779

}

905

780

922

797

/* Called whenever a service has been resolved successfully or

923

798

timed out */

924

799

925

if(quit_now){

926

return;

927

}

928

929

800

switch(event){

930

801

default:

931

802

case AVAHI_RESOLVER_FAILURE:

968

839

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

969

840

is removed from the LAN */

970

841

971

if(quit_now){

972

return;

973

}

974

975

842

switch(event){

976

843

default:

977

844

case AVAHI_BROWSER_FAILURE:

987

854

the callback function is called the Avahi server will free the

988

855

resolver for us. */

989

856

990

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

991

name, type, domain, protocol, 0,

992

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)))

993

861

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

994

862

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

995

863

break;

1006

874

}

1007

875

}

1008

876

877

sig_atomic_t quit_now = 0;

878

1009

879

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

1010

static void handle_sigterm(int sig){

880

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

1011

881

if(quit_now){

1012

882

return;

1013

883

}

1014

884

quit_now = 1;

1015

signal_received = sig;

1016

885

int old_errno = errno;

1017

886

if(mc.simple_poll != NULL){

1018

887

avahi_simple_poll_quit(mc.simple_poll);

1025

894

int error;

1026

895

int ret;

1027

896

intmax_t tmpmax;

1028

char *tmp;

897

int numchars;

1029

898

int exitcode = EXIT_SUCCESS;

1030

899

const char *interface = "eth0";

1031

900

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

901

int sd;

1034

902

uid_t uid;

1035

903

gid_t gid;

1036

904

char *connect_to = NULL;

1040

908

const char *seckey = PATHDIR "/" SECKEY;

1041

909

const char *pubkey = PATHDIR "/" PUBKEY;

1042

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" };

1043

915

bool gnutls_initialized = false;

1044

916

bool gpgme_initialized = false;

1045

float delay = 2.5f;

1046

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

double delay = 2.5;

918

919

struct sigaction old_sigterm_action;

1048

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

921

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

1071

922

{

1072

923

struct argp_option options[] = {

1073

924

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

1102

953

.arg = "SECONDS",

1103

954

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

1104

955

.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 },

1114

956

{ .name = NULL }

1115

957

};

1116

958

1117

959

error_t parse_opt(int key, char *arg,

1118

960

struct argp_state *state){

1119

errno = 0;

1120

961

switch(key){

1121

962

case 128: /* --debug */

1122

963

debug = true;

1134

975

pubkey = arg;

1135

976

break;

1136

977

case 129: /* --dh-bits */

1137

errno = 0;

1138

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

1139

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

1140

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

1141

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

978

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

979

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

980

or arg[numchars] != '\0'){

981

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

982

exit(EXIT_FAILURE);

1142

983

}

1143

984

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

1144

985

break;

1146

987

mc.priority = arg;

1147

988

break;

1148

989

case 131: /* --delay */

1149

errno = 0;

1150

delay = strtof(arg, &tmp);

1151

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

1152

argp_error(state, "Bad delay");

990

ret = sscanf(arg, "%lf%n", &delay, &numchars);

991

if(ret < 1 or arg[numchars] != '\0'){

992

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

993

exit(EXIT_FAILURE);

1153

994

}

1154

995

break;

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);

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1168

999

break;

1169

1000

default:

1170

1001

return ARGP_ERR_UNKNOWN;

1171

1002

}

1172

return errno;

1003

return 0;

1173

1004

}

1174

1005

1175

1006

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

1176

1007

.args_doc = "",

1177

1008

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

1178

1009

" passwords from a Mandos server" };

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;

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

1192

1014

goto end;

1193

1015

}

1194

1016

}

1204

1026

mc.simple_poll = avahi_simple_poll_new();

1205

1027

if(mc.simple_poll == NULL){

1206

1028

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

1207

exitcode = EX_UNAVAILABLE;

1029

exitcode = EXIT_FAILURE;

1208

1030

goto end;

1209

1031

}

1210

1032

1212

1034

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

1213

1035

if(ret == -1){

1214

1036

perror("sigaddset");

1215

exitcode = EX_OSERR;

1037

exitcode = EXIT_FAILURE;

1216

1038

goto end;

1217

1039

}

1218

1040

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

1219

1041

if(ret == -1){

1220

1042

perror("sigaddset");

1221

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1222

1044

goto end;

1223

1045

}

1224

1046

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

1225

1047

if(ret == -1){

1226

1048

perror("sigaddset");

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

}

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1273

1058

1274

1059

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

1275

1060

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

1294

1061

#ifdef __linux__

1295

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1063

messages to mess up the prompt */

1297

1064

ret = klogctl(8, NULL, 5);

1298

1065

bool restore_loglevel = true;

1299

1066

if(ret == -1){

1305

1072

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1073

if(sd < 0){

1307

1074

perror("socket");

1308

exitcode = EX_OSERR;

1075

exitcode = EXIT_FAILURE;

1309

1076

#ifdef __linux__

1310

1077

if(restore_loglevel){

1311

1078

ret = klogctl(7, NULL, 0);

1314

1081

}

1315

1082

}

1316

1083

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1084

goto end;

1324

1085

}

1325

1086

strcpy(network.ifr_name, interface);

1334

1095

}

1335

1096

}

1336

1097

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1098

exitcode = EXIT_FAILURE;

1344

1099

goto end;

1345

1100

}

1346

1101

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

1347

1102

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

1103

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

1350

1104

if(ret == -1){

1351

take_down_interface = false;

1352

1105

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1106

exitcode = EXIT_FAILURE;

1354

1107

#ifdef __linux__

1355

1108

if(restore_loglevel){

1356

1109

ret = klogctl(7, NULL, 0);

1359

1112

}

1360

1113

}

1361

1114

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1115

goto end;

1369

1116

}

1370

1117

}

1382

1129

perror("nanosleep");

1383

1130

}

1384

1131

}

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

}

1132

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

1133

if(ret == -1){

1134

perror("close");

1391

1135

}

1392

1136

#ifdef __linux__

1393

1137

if(restore_loglevel){

1398

1142

}

1399

1143

}

1400

1144

#endif /* __linux__ */

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;

1145

}

1146

1147

uid = getuid();

1148

gid = getgid();

1149

1150

errno = 0;

1151

setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

ret = setuid(uid);

1157

if(ret == -1){

1158

perror("setuid");

1420

1159

}

1421

1160

1422

1161

ret = init_gnutls_global(pubkey, seckey);

1423

1162

if(ret == -1){

1424

1163

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

1425

exitcode = EX_UNAVAILABLE;

1164

exitcode = EXIT_FAILURE;

1426

1165

goto end;

1427

1166

} else {

1428

1167

gnutls_initialized = true;

1429

1168

}

1430

1169

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1436

1170

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

1171

perror("mkdtemp");

1439

1172

goto end;

1440

1173

}

1441

1442

if(quit_now){

1443

goto end;

1444

}

1174

tempdir_created = true;

1445

1175

1446

1176

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

1447

1177

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

1448

exitcode = EX_UNAVAILABLE;

1178

exitcode = EXIT_FAILURE;

1449

1179

goto end;

1450

1180

} else {

1451

1181

gpgme_initialized = true;

1452

1182

}

1453

1183

1454

if(quit_now){

1455

goto end;

1184

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

1185

if_index = (AvahiIfIndex) if_nametoindex(interface);

1186

if(if_index == 0){

1187

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

1188

exitcode = EXIT_FAILURE;

1189

goto end;

1190

}

1456

1191

}

1457

1192

1458

1193

if(connect_to != NULL){

1461

1196

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

1462

1197

if(address == NULL){

1463

1198

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

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1199

exitcode = EXIT_FAILURE;

1200

goto end;

1201

}

1472

1202

uint16_t port;

1473

errno = 0;

1474

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

1475

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

1476

or tmpmax != (uint16_t)tmpmax){

1203

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1204

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1205

or address[numchars+1] != '\0'){

1477

1206

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

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1207

exitcode = EXIT_FAILURE;

1208

goto end;

1209

}

1486

1210

port = (uint16_t)tmpmax;

1487

1211

*address = '\0';

1488

1212

address = connect_to;

1493

1217

} else {

1494

1218

af = AF_INET;

1495

1219

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1501

1220

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

1502

1221

if(ret < 0){

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

}

1222

exitcode = EXIT_FAILURE;

1522

1223

} else {

1523

1224

exitcode = EXIT_SUCCESS;

1524

1225

}

1525

1226

goto end;

1526

1227

}

1527

1528

if(quit_now){

1529

goto end;

1530

}

1531

1228

1532

1229

{

1533

1230

AvahiServerConfig config;

1534

1231

/* Do not publish any local Zeroconf records */

1551

1248

if(mc.server == NULL){

1552

1249

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

1553

1250

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1251

exitcode = EXIT_FAILURE;

1559

1252

goto end;

1560

1253

}

1561

1254

1562

1255

/* Create the Avahi service browser */

1563

1256

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1257

AVAHI_PROTO_INET6, "_mandos._tcp",

1565

1258

NULL, 0, browse_callback, NULL);

1566

1259

if(sb == NULL){

1567

1260

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

1568

1261

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1262

exitcode = EXIT_FAILURE;

1574

1263

goto end;

1575

1264

}

1576

1265

1608

1297

gpgme_release(mc.ctx);

1609

1298

}

1610

1299

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

1643

1300

/* Removes the temp directory used by GPGME */

1644

1301

if(tempdir_created){

1645

1302

DIR *d;

1684

1341

}

1685

1342

}

1686

1343

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

1706

1344

return exitcode;

1707

1345

}