/mandos/release : revision 237.2.71

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() */

140

134

} mandos_context;

141

135

142

136

/* global context so signal handler can reach it*/

143

mandos_context mc = { .simple_poll = NULL, .server = NULL,

144

.dh_bits = 1024, .priority = "SECURE256"

145

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

146

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

137

mandos_context mc;

149

138

150

139

/*

151

140

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

169

158

*/

170

159

static bool init_gpgme(const char *seckey,

171

160

const char *pubkey, const char *tempdir){

161

int ret;

172

162

gpgme_error_t rc;

173

163

gpgme_engine_info_t engine_info;

174

164

177

167

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

178

168

*/

179

169

bool import_key(const char *filename){

180

int ret;

181

170

int fd;

182

171

gpgme_data_t pgp_data;

183

172

254

243

return false;

255

244

}

256

245

257

return true;

246

return true;

258

247

}

259

248

260

249

/*

314

303

}

315

304

gpgme_recipient_t recipient;

316

305

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;

306

if(recipient){

307

while(recipient != NULL){

308

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

309

gpgme_pubkey_algo_name(recipient->pubkey_algo));

310

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

311

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

312

recipient->status == GPG_ERR_NO_SECKEY

313

? "No" : "Yes");

314

recipient = recipient->next;

315

}

325

316

}

326

317

}

327

318

}

479

470

static int init_gnutls_session(gnutls_session_t *session){

480

471

int ret;

481

472

/* 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);

473

ret = gnutls_init(session, GNUTLS_SERVER);

488

474

if(ret != GNUTLS_E_SUCCESS){

489

475

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

490

476

safer_gnutls_strerror(ret));

492

478

493

479

{

494

480

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);

481

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

502

482

if(ret != GNUTLS_E_SUCCESS){

503

483

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

504

484

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

508

488

}

509

489

}

510

490

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);

491

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

492

mc.cred);

519

493

if(ret != GNUTLS_E_SUCCESS){

520

494

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

521

495

safer_gnutls_strerror(ret));

524

498

}

525

499

526

500

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

501

gnutls_certificate_server_set_request(*session,

502

GNUTLS_CERT_IGNORE);

528

503

529

504

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

505

539

514

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

540

515

AvahiIfIndex if_index,

541

516

int af){

542

int ret, tcp_sd = -1;

517

int ret, tcp_sd;

543

518

ssize_t sret;

544

519

union {

545

520

struct sockaddr_in in;

546

521

struct sockaddr_in6 in6;

547

522

} to;

548

523

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

524

char *decrypted_buffer;

550

525

size_t buffer_length = 0;

551

526

size_t buffer_capacity = 0;

527

ssize_t decrypted_buffer_size;

552

528

size_t written;

553

int retval = -1;

529

int retval = 0;

554

530

gnutls_session_t session;

555

531

int pf; /* Protocol family */

556

532

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

533

switch(af){

565

534

case AF_INET6:

566

535

pf = PF_INET6;

570

539

break;

571

540

default:

572

541

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

573

errno = EINVAL;

574

542

return -1;

575

543

}

576

544

586

554

587

555

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

556

if(tcp_sd < 0){

589

int e = errno;

590

557

perror("socket");

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

558

return -1;

598

559

}

599

560

600

561

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

601

562

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

563

to.in6.sin6_family = (uint16_t)af;

603

564

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

604

565

} else { /* IPv4 */

605

566

to.in.sin_family = (sa_family_t)af;

606

567

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

607

568

}

608

569

if(ret < 0 ){

609

int e = errno;

610

570

perror("inet_pton");

611

errno = e;

612

goto mandos_end;

571

return -1;

613

572

}

614

573

if(ret == 0){

615

int e = errno;

616

574

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

617

errno = e;

618

goto mandos_end;

575

return -1;

619

576

}

620

577

if(af == AF_INET6){

621

578

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

628

585

if(if_index == AVAHI_IF_UNSPEC){

629

586

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

630

587

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

588

return -1;

633

589

}

634

590

/* Set the network interface number as scope */

635

591

to.in6.sin6_scope_id = (uint32_t)if_index;

640

596

-Wunreachable-code */

641

597

}

642

598

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

648

599

if(debug){

649

600

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

650

601

char interface[IF_NAMESIZE];

677

628

}

678

629

}

679

630

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

631

if(af == AF_INET6){

686

632

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

687

633

} else {

688

634

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

689

635

}

690

636

if(ret < 0){

691

int e = errno;

692

637

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

638

return -1;

700

639

}

701

640

702

641

const char *out = mandos_protocol_version;

706

645

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

707

646

out_size - written));

708

647

if(ret == -1){

709

int e = errno;

710

648

perror("write");

711

errno = e;

649

retval = -1;

712

650

goto mandos_end;

713

651

}

714

652

written += (size_t)ret;

722

660

break;

723

661

}

724

662

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

663

}

731

664

732

665

if(debug){

733

666

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

734

667

}

735

668

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

741

669

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

670

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

671

do{

749

672

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

754

673

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

755

674

756

675

if(ret != GNUTLS_E_SUCCESS){

758

677

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

759

678

gnutls_perror(ret);

760

679

}

761

errno = EPROTO;

680

retval = -1;

762

681

goto mandos_end;

763

682

}

764

683

770

689

}

771

690

772

691

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

692

buffer_capacity = incbuffer(&buffer, buffer_length,

780

693

buffer_capacity);

781

694

if(buffer_capacity == 0){

782

int e = errno;

783

695

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

696

retval = -1;

790

697

goto mandos_end;

791

698

}

792

699

801

708

case GNUTLS_E_AGAIN:

802

709

break;

803

710

case GNUTLS_E_REHANDSHAKE:

804

do {

711

do{

805

712

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

713

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

812

714

if(ret < 0){

813

715

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

814

716

gnutls_perror(ret);

815

errno = EPROTO;

717

retval = -1;

816

718

goto mandos_end;

817

719

}

818

720

break;

819

721

default:

820

722

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

821

723

" encrypted session with Mandos server\n");

724

retval = -1;

822

725

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

726

goto mandos_end;

825

727

}

826

728

} else {

832

734

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

833

735

}

834

736

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);

737

gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

738

848

739

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

850

740

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

741

buffer_length,

852

742

&decrypted_buffer);

853

743

if(decrypted_buffer_size >= 0){

854

855

744

written = 0;

856

745

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

862

746

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

863

747

(size_t)decrypted_buffer_size - written,

864

748

stdout);

865

749

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

866

int e = errno;

867

750

if(debug){

868

751

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

869

752

strerror(errno));

870

753

}

871

errno = e;

872

goto mandos_end;

754

retval = -1;

755

break;

873

756

}

874

757

written += (size_t)ret;

875

758

}

876

retval = 0;

759

free(decrypted_buffer);

760

} else {

761

retval = -1;

877

762

}

763

} else {

764

retval = -1;

878

765

}

879

766

880

767

/* Shutdown procedure */

881

768

882

769

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;

770

free(buffer);

771

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

772

if(ret == -1){

773

perror("close");

902

774

}

775

gnutls_deinit(session);

903

776

return retval;

904

777

}

905

778

922

795

/* Called whenever a service has been resolved successfully or

923

796

timed out */

924

797

925

if(quit_now){

926

return;

927

}

928

929

798

switch(event){

930

799

default:

931

800

case AVAHI_RESOLVER_FAILURE:

968

837

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

969

838

is removed from the LAN */

970

839

971

if(quit_now){

972

return;

973

}

974

975

840

switch(event){

976

841

default:

977

842

case AVAHI_BROWSER_FAILURE:

987

852

the callback function is called the Avahi server will free the

988

853

resolver for us. */

989

854

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

855

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

856

protocol, name, type, domain,

857

AVAHI_PROTO_INET6, 0,

858

resolve_callback, NULL)))

993

859

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

994

860

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

995

861

break;

1006

872

}

1007

873

}

1008

874

1009

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

1010

static void handle_sigterm(int sig){

875

sig_atomic_t quit_now = 0;

876

877

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

1011

878

if(quit_now){

1012

879

return;

1013

880

}

1014

881

quit_now = 1;

1015

signal_received = sig;

1016

882

int old_errno = errno;

1017

883

if(mc.simple_poll != NULL){

1018

884

avahi_simple_poll_quit(mc.simple_poll);

1025

891

int error;

1026

892

int ret;

1027

893

intmax_t tmpmax;

1028

char *tmp;

894

int numchars;

1029

895

int exitcode = EXIT_SUCCESS;

1030

896

const char *interface = "eth0";

1031

897

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

898

int sd;

1034

899

uid_t uid;

1035

900

gid_t gid;

1036

901

char *connect_to = NULL;

1040

905

const char *seckey = PATHDIR "/" SECKEY;

1041

906

const char *pubkey = PATHDIR "/" PUBKEY;

1042

907

908

/* Initialize Mandos context */

909

mc = (mandos_context){ .simple_poll = NULL, .server = NULL,

910

.dh_bits = 1024, .priority = "SECURE256"

911

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

1043

912

bool gnutls_initialized = false;

1044

913

bool gpgme_initialized = false;

1045

float delay = 2.5f;

1046

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

914

double delay = 2.5;

915

916

struct sigaction old_sigterm_action;

1048

917

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

918

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

919

{

1072

920

struct argp_option options[] = {

1073

921

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

1102

950

.arg = "SECONDS",

1103

951

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

1104

952

.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

953

{ .name = NULL }

1115

954

};

1116

955

1117

956

error_t parse_opt(int key, char *arg,

1118

957

struct argp_state *state){

1119

errno = 0;

1120

958

switch(key){

1121

959

case 128: /* --debug */

1122

960

debug = true;

1134

972

pubkey = arg;

1135

973

break;

1136

974

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");

975

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

976

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

977

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

978

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

979

exit(EXIT_FAILURE);

1142

980

}

1143

981

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

1144

982

break;

1146

984

mc.priority = arg;

1147

985

break;

1148

986

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");

987

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

988

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

989

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

990

exit(EXIT_FAILURE);

1153

991

}

1154

992

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);

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

case ARGP_KEY_END:

1168

996

break;

1169

997

default:

1170

998

return ARGP_ERR_UNKNOWN;

1171

999

}

1172

return errno;

1000

return 0;

1173

1001

}

1174

1002

1175

1003

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

1176

1004

.args_doc = "",

1177

1005

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

1178

1006

" 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;

1192

goto end;

1193

}

1194

}

1195

1196

if(not debug){

1197

avahi_set_log_function(empty_log);

1198

}

1199

1200

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

1201

from the signal handler */

1202

/* Initialize the pseudo-RNG for Avahi */

1203

srand((unsigned int) time(NULL));

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

1207

exitcode = EX_UNAVAILABLE;

1208

goto end;

1209

}

1210

1211

sigemptyset(&sigterm_action.sa_mask);

1212

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

1213

if(ret == -1){

1214

perror("sigaddset");

1215

exitcode = EX_OSERR;

1216

goto end;

1217

}

1218

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

1219

if(ret == -1){

1220

perror("sigaddset");

1221

exitcode = EX_OSERR;

1222

goto end;

1223

}

1224

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

1225

if(ret == -1){

1226

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;

1007

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

1008

if(ret == ARGP_ERR_UNKNOWN){

1009

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

1010

exitcode = EXIT_FAILURE;

1270

1011

goto end;

1271

1012

}

1272

1013

}

1273

1014

1274

1015

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

1275

1016

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

1017

#ifdef __linux__

1295

1018

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1019

messages to mess up the prompt */

1297

1020

ret = klogctl(8, NULL, 5);

1298

1021

bool restore_loglevel = true;

1299

1022

if(ret == -1){

1305

1028

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1029

if(sd < 0){

1307

1030

perror("socket");

1308

exitcode = EX_OSERR;

1031

exitcode = EXIT_FAILURE;

1309

1032

#ifdef __linux__

1310

1033

if(restore_loglevel){

1311

1034

ret = klogctl(7, NULL, 0);

1314

1037

}

1315

1038

}

1316

1039

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1040

goto end;

1324

1041

}

1325

1042

strcpy(network.ifr_name, interface);

1334

1051

}

1335

1052

}

1336

1053

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1054

exitcode = EXIT_FAILURE;

1344

1055

goto end;

1345

1056

}

1346

1057

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

1347

1058

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

1059

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

1350

1060

if(ret == -1){

1351

take_down_interface = false;

1352

1061

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1062

exitcode = EXIT_FAILURE;

1354

1063

#ifdef __linux__

1355

1064

if(restore_loglevel){

1356

1065

ret = klogctl(7, NULL, 0);

1359

1068

}

1360

1069

}

1361

1070

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1071

goto end;

1369

1072

}

1370

1073

}

1382

1085

perror("nanosleep");

1383

1086

}

1384

1087

}

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

}

1088

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

1089

if(ret == -1){

1090

perror("close");

1391

1091

}

1392

1092

#ifdef __linux__

1393

1093

if(restore_loglevel){

1398

1098

}

1399

1099

}

1400

1100

#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;

1101

}

1102

1103

uid = getuid();

1104

gid = getgid();

1105

1106

errno = 0;

1107

setgid(gid);

1108

if(ret == -1){

1109

perror("setgid");

1110

}

1111

1112

ret = setuid(uid);

1113

if(ret == -1){

1114

perror("setuid");

1420

1115

}

1421

1116

1422

1117

ret = init_gnutls_global(pubkey, seckey);

1423

1118

if(ret == -1){

1424

1119

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

1425

exitcode = EX_UNAVAILABLE;

1120

exitcode = EXIT_FAILURE;

1426

1121

goto end;

1427

1122

} else {

1428

1123

gnutls_initialized = true;

1429

1124

}

1430

1125

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1436

1126

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

1127

perror("mkdtemp");

1439

1128

goto end;

1440

1129

}

1441

1442

if(quit_now){

1443

goto end;

1444

}

1130

tempdir_created = true;

1445

1131

1446

1132

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

1447

1133

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

1448

exitcode = EX_UNAVAILABLE;

1134

exitcode = EXIT_FAILURE;

1449

1135

goto end;

1450

1136

} else {

1451

1137

gpgme_initialized = true;

1452

1138

}

1453

1139

1454

if(quit_now){

1455

goto end;

1140

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

1141

if_index = (AvahiIfIndex) if_nametoindex(interface);

1142

if(if_index == 0){

1143

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

1144

exitcode = EXIT_FAILURE;

1145

goto end;

1146

}

1456

1147

}

1457

1148

1458

1149

if(connect_to != NULL){

1461

1152

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

1462

1153

if(address == NULL){

1463

1154

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

1155

exitcode = EXIT_FAILURE;

1156

goto end;

1157

}

1472

1158

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){

1159

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

1160

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

1161

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

1477

1162

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

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1163

exitcode = EXIT_FAILURE;

1164

goto end;

1165

}

1486

1166

port = (uint16_t)tmpmax;

1487

1167

*address = '\0';

1488

1168

address = connect_to;

1493

1173

} else {

1494

1174

af = AF_INET;

1495

1175

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1501

1176

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

1502

1177

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

}

1178

exitcode = EXIT_FAILURE;

1522

1179

} else {

1523

1180

exitcode = EXIT_SUCCESS;

1524

1181

}

1525

1182

goto end;

1526

1183

}

1527

1184

1528

if(quit_now){

1185

if(not debug){

1186

avahi_set_log_function(empty_log);

1187

}

1188

1189

/* Initialize the pseudo-RNG for Avahi */

1190

srand((unsigned int) time(NULL));

1191

1192

/* Allocate main Avahi loop object */

1193

mc.simple_poll = avahi_simple_poll_new();

1194

if(mc.simple_poll == NULL){

1195

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

1196

exitcode = EXIT_FAILURE;

1529

1197

goto end;

1530

1198

}

1531

1199

1551

1219

if(mc.server == NULL){

1552

1220

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

1553

1221

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1222

exitcode = EXIT_FAILURE;

1559

1223

goto end;

1560

1224

}

1561

1225

1562

1226

/* Create the Avahi service browser */

1563

1227

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1228

AVAHI_PROTO_INET6, "_mandos._tcp",

1565

1229

NULL, 0, browse_callback, NULL);

1566

1230

if(sb == NULL){

1567

1231

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

1568

1232

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1233

exitcode = EXIT_FAILURE;

1570

1234

goto end;

1571

1235

}

1572

1236

1573

if(quit_now){

1574

goto end;

1575

}

1237

sigemptyset(&sigterm_action.sa_mask);

1238

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

1239

if(ret == -1){

1240

perror("sigaddset");

1241

exitcode = EXIT_FAILURE;

1242

goto end;

1243

}

1244

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

1245

if(ret == -1){

1246

perror("sigaddset");

1247

exitcode = EXIT_FAILURE;

1248

goto end;

1249

}

1250

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

1251

if(ret == -1){

1252

perror("sigaddset");

1253

exitcode = EXIT_FAILURE;

1254

goto end;

1255

}

1256

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

1257

if(ret == -1){

1258

perror("sigaction");

1259

exitcode = EXIT_FAILURE;

1260

goto end;

1261

}

1576

1262

1577

1263

/* Run the main loop */

1578

1264

1608

1294

gpgme_release(mc.ctx);

1609

1295

}

1610

1296

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

1297

/* Removes the temp directory used by GPGME */

1644

1298

if(tempdir_created){

1645

1299

DIR *d;

1684

1338

}

1685

1339

}

1686

1340

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

1341

return exitcode;

1707

1342

}