/mandos/trunk : revision 24.1.154

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

38

42

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

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

42

45

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

43

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

44

srand() */

46

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

47

strtof(), abort() */

45

48

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

46

49

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

47

50

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

56

59

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

57

60

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

58

61

*/

59

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

62

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

63

strtoimax() */

60

64

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

61

65

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

62

66

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

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() */

134

140

} mandos_context;

135

141

136

142

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

137

mandos_context mc;

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;

138

149

139

150

/*

140

151

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

158

169

*/

159

170

static bool init_gpgme(const char *seckey,

160

171

const char *pubkey, const char *tempdir){

161

int ret;

162

172

gpgme_error_t rc;

163

173

gpgme_engine_info_t engine_info;

164

174

167

177

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

168

178

*/

169

179

bool import_key(const char *filename){

180

int ret;

170

181

int fd;

171

182

gpgme_data_t pgp_data;

172

183

243

254

return false;

244

255

}

245

256

246

return true;

257

return true;

247

258

}

248

259

249

260

/*

303

314

}

304

315

gpgme_recipient_t recipient;

305

316

recipient = result->recipients;

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

}

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;

316

325

}

317

326

}

318

327

}

470

479

static int init_gnutls_session(gnutls_session_t *session){

471

480

int ret;

472

481

/* GnuTLS session creation */

473

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);

474

488

if(ret != GNUTLS_E_SUCCESS){

475

489

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

476

490

safer_gnutls_strerror(ret));

478

492

479

493

{

480

494

const char *err;

481

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);

482

502

if(ret != GNUTLS_E_SUCCESS){

483

503

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

484

504

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

488

508

}

489

509

}

490

510

491

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

492

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);

493

519

if(ret != GNUTLS_E_SUCCESS){

494

520

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

495

521

safer_gnutls_strerror(ret));

498

524

}

499

525

500

526

/* ignore client certificate if any. */

501

gnutls_certificate_server_set_request(*session,

502

GNUTLS_CERT_IGNORE);

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

528

504

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

505

530

514

539

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

515

540

AvahiIfIndex if_index,

516

541

int af){

517

int ret, tcp_sd;

542

int ret, tcp_sd = -1;

518

543

ssize_t sret;

519

544

union {

520

545

struct sockaddr_in in;

521

546

struct sockaddr_in6 in6;

522

547

} to;

523

548

char *buffer = NULL;

524

char *decrypted_buffer;

549

char *decrypted_buffer = NULL;

525

550

size_t buffer_length = 0;

526

551

size_t buffer_capacity = 0;

527

ssize_t decrypted_buffer_size;

528

552

size_t written;

529

int retval = 0;

553

int retval = -1;

530

554

gnutls_session_t session;

531

555

int pf; /* Protocol family */

532

556

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

533

564

switch(af){

534

565

case AF_INET6:

535

566

pf = PF_INET6;

539

570

break;

540

571

default:

541

572

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

573

errno = EINVAL;

542

574

return -1;

543

575

}

544

576

554

586

555

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

556

588

if(tcp_sd < 0){

589

int e = errno;

557

590

perror("socket");

558

return -1;

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

559

598

}

560

599

561

600

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

562

601

if(af == AF_INET6){

563

to.in6.sin6_family = (uint16_t)af;

602

to.in6.sin6_family = (sa_family_t)af;

564

603

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

565

604

} else { /* IPv4 */

566

605

to.in.sin_family = (sa_family_t)af;

567

606

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

568

607

}

569

608

if(ret < 0 ){

609

int e = errno;

570

610

perror("inet_pton");

571

return -1;

611

errno = e;

612

goto mandos_end;

572

613

}

573

614

if(ret == 0){

615

int e = errno;

574

616

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

575

return -1;

617

errno = e;

618

goto mandos_end;

576

619

}

577

620

if(af == AF_INET6){

578

621

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

585

628

if(if_index == AVAHI_IF_UNSPEC){

586

629

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

587

630

" without a network interface\n");

588

return -1;

631

errno = EINVAL;

632

goto mandos_end;

589

633

}

590

634

/* Set the network interface number as scope */

591

635

to.in6.sin6_scope_id = (uint32_t)if_index;

596

640

-Wunreachable-code */

597

641

}

598

642

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

599

648

if(debug){

600

649

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

601

650

char interface[IF_NAMESIZE];

628

677

}

629

678

}

630

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

631

685

if(af == AF_INET6){

632

686

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

633

687

} else {

634

688

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

635

689

}

636

690

if(ret < 0){

691

int e = errno;

637

692

perror("connect");

638

return -1;

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

639

700

}

640

701

641

702

const char *out = mandos_protocol_version;

645

706

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

646

707

out_size - written));

647

708

if(ret == -1){

709

int e = errno;

648

710

perror("write");

649

retval = -1;

711

errno = e;

650

712

goto mandos_end;

651

713

}

652

714

written += (size_t)ret;

660

722

break;

661

723

}

662

724

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

663

730

}

664

731

665

732

if(debug){

666

733

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

667

734

}

668

735

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

669

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

670

742

671

do{

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

672

749

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

673

754

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

674

755

675

756

if(ret != GNUTLS_E_SUCCESS){

677

758

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

678

759

gnutls_perror(ret);

679

760

}

680

retval = -1;

761

errno = EPROTO;

681

762

goto mandos_end;

682

763

}

683

764

689

770

}

690

771

691

772

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

692

779

buffer_capacity = incbuffer(&buffer, buffer_length,

693

780

buffer_capacity);

694

781

if(buffer_capacity == 0){

782

int e = errno;

695

783

perror("incbuffer");

696

retval = -1;

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

697

790

goto mandos_end;

698

791

}

699

792

708

801

case GNUTLS_E_AGAIN:

709

802

break;

710

803

case GNUTLS_E_REHANDSHAKE:

711

do{

804

do {

712

805

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

713

811

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

714

812

if(ret < 0){

715

813

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

716

814

gnutls_perror(ret);

717

retval = -1;

815

errno = EPROTO;

718

816

goto mandos_end;

719

817

}

720

818

break;

721

819

default:

722

820

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

723

821

" encrypted session with Mandos server\n");

724

retval = -1;

725

822

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

726

824

goto mandos_end;

727

825

}

728

826

} else {

734

832

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

735

833

}

736

834

737

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);

738

847

739

848

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

740

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

741

851

buffer_length,

742

852

&decrypted_buffer);

743

853

if(decrypted_buffer_size >= 0){

854

744

855

written = 0;

745

856

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

746

862

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

747

863

(size_t)decrypted_buffer_size - written,

748

864

stdout);

749

865

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

866

int e = errno;

750

867

if(debug){

751

868

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

752

869

strerror(errno));

753

870

}

754

retval = -1;

755

break;

871

errno = e;

872

goto mandos_end;

756

873

}

757

874

written += (size_t)ret;

758

875

}

759

free(decrypted_buffer);

760

} else {

761

retval = -1;

876

retval = 0;

762

877

}

763

} else {

764

retval = -1;

765

878

}

766

879

767

880

/* Shutdown procedure */

768

881

769

882

mandos_end:

770

free(buffer);

771

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

772

if(ret == -1){

773

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;

774

902

}

775

gnutls_deinit(session);

776

903

return retval;

777

904

}

778

905

795

922

/* Called whenever a service has been resolved successfully or

796

923

timed out */

797

924

925

if(quit_now){

926

return;

927

}

928

798

929

switch(event){

799

930

default:

800

931

case AVAHI_RESOLVER_FAILURE:

837

968

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

838

969

is removed from the LAN */

839

970

971

if(quit_now){

972

return;

973

}

974

840

975

switch(event){

841

976

default:

842

977

case AVAHI_BROWSER_FAILURE:

852

987

the callback function is called the Avahi server will free the

853

988

resolver for us. */

854

989

855

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

856

protocol, name, type, domain,

857

AVAHI_PROTO_INET6, 0,

858

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)

859

993

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

860

994

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

861

995

break;

872

1006

}

873

1007

}

874

1008

875

sig_atomic_t quit_now = 0;

876

877

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

1009

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

1010

static void handle_sigterm(int sig){

878

1011

if(quit_now){

879

1012

return;

880

1013

}

881

1014

quit_now = 1;

1015

signal_received = sig;

882

1016

int old_errno = errno;

883

1017

if(mc.simple_poll != NULL){

884

1018

avahi_simple_poll_quit(mc.simple_poll);

891

1025

int error;

892

1026

int ret;

893

1027

intmax_t tmpmax;

894

int numchars;

1028

char *tmp;

895

1029

int exitcode = EXIT_SUCCESS;

896

1030

const char *interface = "eth0";

897

1031

struct ifreq network;

898

int sd;

1032

int sd = -1;

1033

bool take_down_interface = false;

899

1034

uid_t uid;

900

1035

gid_t gid;

901

1036

char *connect_to = NULL;

905

1040

const char *seckey = PATHDIR "/" SECKEY;

906

1041

const char *pubkey = PATHDIR "/" PUBKEY;

907

1042

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" };

912

1043

bool gnutls_initialized = false;

913

1044

bool gpgme_initialized = false;

914

double delay = 2.5;

915

916

struct sigaction old_sigterm_action;

1045

float delay = 2.5f;

1046

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

1048

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

918

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

919

1071

{

920

1072

struct argp_option options[] = {

921

1073

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

950

1102

.arg = "SECONDS",

951

1103

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

952

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 },

953

1114

{ .name = NULL }

954

1115

};

955

1116

956

1117

error_t parse_opt(int key, char *arg,

957

1118

struct argp_state *state){

1119

errno = 0;

958

1120

switch(key){

959

1121

case 128: /* --debug */

960

1122

debug = true;

972

1134

pubkey = arg;

973

1135

break;

974

1136

case 129: /* --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);

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");

980

1142

}

981

1143

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

982

1144

break;

984

1146

mc.priority = arg;

985

1147

break;

986

1148

case 131: /* --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);

1149

errno = 0;

1150

delay = strtof(arg, &tmp);

1151

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

1152

argp_error(state, "Bad delay");

991

1153

}

992

1154

break;

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

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);

996

1168

break;

997

1169

default:

998

1170

return ARGP_ERR_UNKNOWN;

999

1171

}

1000

return 0;

1172

return errno;

1001

1173

}

1002

1174

1003

1175

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

1004

1176

.args_doc = "",

1005

1177

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

1006

1178

" passwords from a Mandos server" };

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;

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;

1011

1270

goto end;

1012

1271

}

1013

1272

}

1014

1273

1015

1274

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

1016

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

1017

1294

#ifdef __linux__

1018

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1019

messages to mess up the prompt */

1296

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

1020

1297

ret = klogctl(8, NULL, 5);

1021

1298

bool restore_loglevel = true;

1022

1299

if(ret == -1){

1028

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1029

1306

if(sd < 0){

1030

1307

perror("socket");

1031

exitcode = EXIT_FAILURE;

1308

exitcode = EX_OSERR;

1032

1309

#ifdef __linux__

1033

1310

if(restore_loglevel){

1034

1311

ret = klogctl(7, NULL, 0);

1037

1314

}

1038

1315

}

1039

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1040

1323

goto end;

1041

1324

}

1042

1325

strcpy(network.ifr_name, interface);

1051

1334

}

1052

1335

}

1053

1336

#endif /* __linux__ */

1054

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

}

1055

1344

goto end;

1056

1345

}

1057

1346

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

1058

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1059

1349

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

1060

1350

if(ret == -1){

1351

take_down_interface = false;

1061

1352

perror("ioctl SIOCSIFFLAGS");

1062

exitcode = EXIT_FAILURE;

1353

exitcode = EX_OSERR;

1063

1354

#ifdef __linux__

1064

1355

if(restore_loglevel){

1065

1356

ret = klogctl(7, NULL, 0);

1068

1359

}

1069

1360

}

1070

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1071

1368

goto end;

1072

1369

}

1073

1370

}

1085

1382

perror("nanosleep");

1086

1383

}

1087

1384

}

1088

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

1089

if(ret == -1){

1090

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

}

1091

1391

}

1092

1392

#ifdef __linux__

1093

1393

if(restore_loglevel){

1098

1398

}

1099

1399

}

1100

1400

#endif /* __linux__ */

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");

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;

1115

1420

}

1116

1421

1117

1422

ret = init_gnutls_global(pubkey, seckey);

1118

1423

if(ret == -1){

1119

1424

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

1120

exitcode = EXIT_FAILURE;

1425

exitcode = EX_UNAVAILABLE;

1121

1426

goto end;

1122

1427

} else {

1123

1428

gnutls_initialized = true;

1124

1429

}

1125

1430

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1126

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1127

1438

perror("mkdtemp");

1128

1439

goto end;

1129

1440

}

1130

tempdir_created = true;

1441

1442

if(quit_now){

1443

goto end;

1444

}

1131

1445

1132

1446

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

1133

1447

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

1134

exitcode = EXIT_FAILURE;

1448

exitcode = EX_UNAVAILABLE;

1135

1449

goto end;

1136

1450

} else {

1137

1451

gpgme_initialized = true;

1138

1452

}

1139

1453

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

}

1454

if(quit_now){

1455

goto end;

1147

1456

}

1148

1457

1149

1458

if(connect_to != NULL){

1152

1461

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

1153

1462

if(address == NULL){

1154

1463

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

1155

exitcode = EXIT_FAILURE;

1156

goto end;

1157

}

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1158

1472

uint16_t port;

1159

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

1160

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

1161

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

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){

1162

1477

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

1163

exitcode = EXIT_FAILURE;

1164

goto end;

1165

}

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1166

1486

port = (uint16_t)tmpmax;

1167

1487

*address = '\0';

1168

1488

address = connect_to;

1173

1493

} else {

1174

1494

af = AF_INET;

1175

1495

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1176

1501

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

1177

1502

if(ret < 0){

1178

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

}

1179

1522

} else {

1180

1523

exitcode = EXIT_SUCCESS;

1181

1524

}

1182

1525

goto end;

1183

1526

}

1184

1527

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;

1528

if(quit_now){

1197

1529

goto end;

1198

1530

}

1199

1531

1219

1551

if(mc.server == NULL){

1220

1552

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

1221

1553

avahi_strerror(error));

1222

exitcode = EXIT_FAILURE;

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1223

1559

goto end;

1224

1560

}

1225

1561

1226

1562

/* Create the Avahi service browser */

1227

1563

sb = avahi_s_service_browser_new(mc.server, if_index,

1228

AVAHI_PROTO_INET6, "_mandos._tcp",

1564

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1229

1565

NULL, 0, browse_callback, NULL);

1230

1566

if(sb == NULL){

1231

1567

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

1232

1568

avahi_strerror(avahi_server_errno(mc.server)));

1233

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1234

1570

goto end;

1235

1571

}

1236

1572

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

}

1573

if(quit_now){

1574

goto end;

1575

}

1262

1576

1263

1577

/* Run the main loop */

1264

1578

1294

1608

gpgme_release(mc.ctx);

1295

1609

}

1296

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

1297

1643

/* Removes the temp directory used by GPGME */

1298

1644

if(tempdir_created){

1299

1645

DIR *d;

1338

1684

}

1339

1685

}

1340

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

1341

1706

return exitcode;

1342

1707

}