/mandos/trunk : revision 396

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

46

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

44

srand() */

47

srand(), 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 */

81

86

82

87

#ifdef __linux__

83

88

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

138

143

.dh_bits = 1024, .priority = "SECURE256"

139

144

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

140

145

146

sig_atomic_t quit_now = 0;

147

int signal_received = 0;

148

141

149

/*

142

150

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

143

151

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

160

168

*/

161

169

static bool init_gpgme(const char *seckey,

162

170

const char *pubkey, const char *tempdir){

163

int ret;

164

171

gpgme_error_t rc;

165

172

gpgme_engine_info_t engine_info;

166

173

169

176

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

170

177

*/

171

178

bool import_key(const char *filename){

179

int ret;

172

180

int fd;

173

181

gpgme_data_t pgp_data;

174

182

245

253

return false;

246

254

}

247

255

248

return true;

256

return true;

249

257

}

250

258

251

259

/*

305

313

}

306

314

gpgme_recipient_t recipient;

307

315

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

316

while(recipient != NULL){

317

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

318

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

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

320

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

321

recipient->status == GPG_ERR_NO_SECKEY

322

? "No" : "Yes");

323

recipient = recipient->next;

318

324

}

319

325

}

320

326

}

472

478

static int init_gnutls_session(gnutls_session_t *session){

473

479

int ret;

474

480

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

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

476

487

if(ret != GNUTLS_E_SUCCESS){

477

488

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

478

489

safer_gnutls_strerror(ret));

480

491

481

492

{

482

493

const char *err;

483

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

494

do {

495

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

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

484

501

if(ret != GNUTLS_E_SUCCESS){

485

502

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

486

503

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

490

507

}

491

508

}

492

509

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

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

495

518

if(ret != GNUTLS_E_SUCCESS){

496

519

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

497

520

safer_gnutls_strerror(ret));

500

523

}

501

524

502

525

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

527

506

528

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

529

516

538

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

517

539

AvahiIfIndex if_index,

518

540

int af){

519

int ret, tcp_sd;

541

int ret, tcp_sd = -1;

520

542

ssize_t sret;

521

543

union {

522

544

struct sockaddr_in in;

523

545

struct sockaddr_in6 in6;

524

546

} to;

525

547

char *buffer = NULL;

526

char *decrypted_buffer;

548

char *decrypted_buffer = NULL;

527

549

size_t buffer_length = 0;

528

550

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

551

size_t written;

531

int retval = 0;

552

int retval = -1;

532

553

gnutls_session_t session;

533

554

int pf; /* Protocol family */

534

555

556

if(quit_now){

557

return -1;

558

}

559

535

560

switch(af){

536

561

case AF_INET6:

537

562

pf = PF_INET6;

557

582

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

583

if(tcp_sd < 0){

559

584

perror("socket");

560

return -1;

585

goto mandos_end;

586

}

587

588

if(quit_now){

589

goto mandos_end;

561

590

}

562

591

563

592

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

564

593

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

594

to.in6.sin6_family = (sa_family_t)af;

566

595

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

567

596

} else { /* IPv4 */

568

597

to.in.sin_family = (sa_family_t)af;

570

599

}

571

600

if(ret < 0 ){

572

601

perror("inet_pton");

573

return -1;

602

goto mandos_end;

574

603

}

575

604

if(ret == 0){

576

605

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

577

return -1;

606

goto mandos_end;

578

607

}

579

608

if(af == AF_INET6){

580

609

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

587

616

if(if_index == AVAHI_IF_UNSPEC){

588

617

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

589

618

" without a network interface\n");

590

return -1;

619

goto mandos_end;

591

620

}

592

621

/* Set the network interface number as scope */

593

622

to.in6.sin6_scope_id = (uint32_t)if_index;

598

627

-Wunreachable-code */

599

628

}

600

629

630

if(quit_now){

631

goto mandos_end;

632

}

633

601

634

if(debug){

602

635

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

603

636

char interface[IF_NAMESIZE];

630

663

}

631

664

}

632

665

666

if(quit_now){

667

goto mandos_end;

668

}

669

633

670

if(af == AF_INET6){

634

671

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

635

672

} else {

637

674

}

638

675

if(ret < 0){

639

676

perror("connect");

640

return -1;

677

goto mandos_end;

678

}

679

680

if(quit_now){

681

goto mandos_end;

641

682

}

642

683

643

684

const char *out = mandos_protocol_version;

648

689

out_size - written));

649

690

if(ret == -1){

650

691

perror("write");

651

retval = -1;

652

692

goto mandos_end;

653

693

}

654

694

written += (size_t)ret;

662

702

break;

663

703

}

664

704

}

705

706

if(quit_now){

707

goto mandos_end;

708

}

665

709

}

666

710

667

711

if(debug){

668

712

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

669

713

}

670

714

715

if(quit_now){

716

goto mandos_end;

717

}

718

671

719

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

720

673

do{

721

if(quit_now){

722

goto mandos_end;

723

}

724

725

do {

674

726

ret = gnutls_handshake(session);

727

if(quit_now){

728

goto mandos_end;

729

}

675

730

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

676

731

677

732

if(ret != GNUTLS_E_SUCCESS){

679

734

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

680

735

gnutls_perror(ret);

681

736

}

682

retval = -1;

683

737

goto mandos_end;

684

738

}

685

739

691

745

}

692

746

693

747

while(true){

748

749

if(quit_now){

750

goto mandos_end;

751

}

752

694

753

buffer_capacity = incbuffer(&buffer, buffer_length,

695

754

buffer_capacity);

696

755

if(buffer_capacity == 0){

697

756

perror("incbuffer");

698

retval = -1;

757

goto mandos_end;

758

}

759

760

if(quit_now){

699

761

goto mandos_end;

700

762

}

701

763

710

772

case GNUTLS_E_AGAIN:

711

773

break;

712

774

case GNUTLS_E_REHANDSHAKE:

713

do{

775

do {

714

776

ret = gnutls_handshake(session);

777

778

if(quit_now){

779

goto mandos_end;

780

}

715

781

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

716

782

if(ret < 0){

717

783

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

718

784

gnutls_perror(ret);

719

retval = -1;

720

785

goto mandos_end;

721

786

}

722

787

break;

723

788

default:

724

789

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

725

790

" encrypted session with Mandos server\n");

726

retval = -1;

727

791

gnutls_bye(session, GNUTLS_SHUT_RDWR);

728

792

goto mandos_end;

729

793

}

736

800

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

737

801

}

738

802

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

803

if(quit_now){

804

goto mandos_end;

805

}

806

807

do {

808

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

809

if(quit_now){

810

goto mandos_end;

811

}

812

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

740

813

741

814

if(buffer_length > 0){

815

ssize_t decrypted_buffer_size;

742

816

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

817

buffer_length,

744

818

&decrypted_buffer);

745

819

if(decrypted_buffer_size >= 0){

820

746

821

written = 0;

747

822

while(written < (size_t) decrypted_buffer_size){

823

if(quit_now){

824

goto mandos_end;

825

}

826

748

827

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

749

828

(size_t)decrypted_buffer_size - written,

750

829

stdout);

753

832

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

754

833

strerror(errno));

755

834

}

756

retval = -1;

757

break;

835

goto mandos_end;

758

836

}

759

837

written += (size_t)ret;

760

838

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

839

retval = 0;

764

840

}

765

} else {

766

retval = -1;

767

841

}

768

842

769

843

/* Shutdown procedure */

770

844

771

845

mandos_end:

846

free(decrypted_buffer);

772

847

free(buffer);

773

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

848

if(tcp_sd >= 0){

849

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

850

}

774

851

if(ret == -1){

775

852

perror("close");

776

853

}

777

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

857

}

778

858

return retval;

779

859

}

780

860

797

877

/* Called whenever a service has been resolved successfully or

798

878

timed out */

799

879

880

if(quit_now){

881

return;

882

}

883

800

884

switch(event){

801

885

default:

802

886

case AVAHI_RESOLVER_FAILURE:

839

923

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

840

924

is removed from the LAN */

841

925

926

if(quit_now){

927

return;

928

}

929

842

930

switch(event){

843

931

default:

844

932

case AVAHI_BROWSER_FAILURE:

854

942

the callback function is called the Avahi server will free the

855

943

resolver for us. */

856

944

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

945

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

946

name, type, domain, protocol, 0,

947

resolve_callback, NULL) == NULL)

861

948

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

862

949

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

863

950

break;

874

961

}

875

962

}

876

963

877

sig_atomic_t quit_now = 0;

878

879

964

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

880

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

965

static void handle_sigterm(int sig){

881

966

if(quit_now){

882

967

return;

883

968

}

884

969

quit_now = 1;

970

signal_received = sig;

885

971

int old_errno = errno;

886

972

if(mc.simple_poll != NULL){

887

973

avahi_simple_poll_quit(mc.simple_poll);

894

980

int error;

895

981

int ret;

896

982

intmax_t tmpmax;

897

int numchars;

983

char *tmp;

898

984

int exitcode = EXIT_SUCCESS;

899

985

const char *interface = "eth0";

900

986

struct ifreq network;

901

int sd;

987

int sd = -1;

988

bool take_down_interface = false;

902

989

uid_t uid;

903

990

gid_t gid;

904

991

char *connect_to = NULL;

908

995

const char *seckey = PATHDIR "/" SECKEY;

909

996

const char *pubkey = PATHDIR "/" PUBKEY;

910

997

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

915

998

bool gnutls_initialized = false;

916

999

bool gpgme_initialized = false;

917

double delay = 2.5;

918

919

struct sigaction old_sigterm_action;

1000

float delay = 2.5f;

1001

1002

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

920

1003

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

921

1004

1005

uid = getuid();

1006

gid = getgid();

1007

1008

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

1009

errno = 0;

1010

ret = setgid(gid);

1011

if(ret == -1){

1012

perror("setgid");

1013

}

1014

1015

/* Lower user privileges (temporarily) */

1016

errno = 0;

1017

ret = seteuid(uid);

1018

if(ret == -1){

1019

perror("seteuid");

1020

}

1021

1022

if(quit_now){

1023

goto end;

1024

}

1025

922

1026

{

923

1027

struct argp_option options[] = {

924

1028

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

953

1057

.arg = "SECONDS",

954

1058

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

955

1059

.group = 2 },

1060

/*

1061

* These reproduce what we would get without ARGP_NO_HELP

1062

*/

1063

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

1064

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

1065

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

1066

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

1067

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

1068

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

956

1069

{ .name = NULL }

957

1070

};

958

1071

959

1072

error_t parse_opt(int key, char *arg,

960

1073

struct argp_state *state){

1074

errno = 0;

961

1075

switch(key){

962

1076

case 128: /* --debug */

963

1077

debug = true;

975

1089

pubkey = arg;

976

1090

break;

977

1091

case 129: /* --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);

1092

errno = 0;

1093

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

1094

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

1095

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

1096

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

983

1097

}

984

1098

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

985

1099

break;

987

1101

mc.priority = arg;

988

1102

break;

989

1103

case 131: /* --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);

1104

errno = 0;

1105

delay = strtof(arg, &tmp);

1106

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

1107

argp_error(state, "Bad delay");

994

1108

}

995

1109

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1110

/*

1111

* These reproduce what we would get without ARGP_NO_HELP

1112

*/

1113

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

1114

argp_state_help(state, state->out_stream,

1115

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1116

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1117

case -3: /* --usage */

1118

argp_state_help(state, state->out_stream,

1119

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1120

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

1121

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

1122

exit(argp_err_exit_status);

999

1123

break;

1000

1124

default:

1001

1125

return ARGP_ERR_UNKNOWN;

1002

1126

}

1003

return 0;

1127

return errno;

1004

1128

}

1005

1129

1006

1130

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

1007

1131

.args_doc = "",

1008

1132

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

1009

1133

" passwords from a Mandos server" };

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;

1134

ret = argp_parse(&argp, argc, argv,

1135

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1136

switch(ret){

1137

case 0:

1138

break;

1139

case ENOMEM:

1140

default:

1141

errno = ret;

1142

perror("argp_parse");

1143

exitcode = EX_OSERR;

1144

goto end;

1145

case EINVAL:

1146

exitcode = EX_USAGE;

1014

1147

goto end;

1015

1148

}

1016

1149

}

1049

1182

exitcode = EXIT_FAILURE;

1050

1183

goto end;

1051

1184

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1185

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

1186

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

1187

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

1188

*/

1189

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

1190

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1193

}

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

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

1196

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

1201

}

1202

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

1203

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1206

}

1207

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

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

1209

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1214

}

1215

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

1216

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1219

}

1220

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

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

1222

if(ret == -1){

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1225

goto end;

1226

}

1227

}

1058

1228

1059

1229

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

1060

1230

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

1231

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

if(if_index == 0){

1233

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

1234

exitcode = EXIT_FAILURE;

1235

goto end;

1236

}

1237

1238

if(quit_now){

1239

goto end;

1240

}

1241

1242

/* Re-raise priviliges */

1243

errno = 0;

1244

ret = seteuid(0);

1245

if(ret == -1){

1246

perror("seteuid");

1247

}

1248

1061

1249

#ifdef __linux__

1062

1250

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1251

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

1064

1252

ret = klogctl(8, NULL, 5);

1065

1253

bool restore_loglevel = true;

1066

1254

if(ret == -1){

1081

1269

}

1082

1270

}

1083

1271

#endif /* __linux__ */

1272

/* Lower privileges */

1273

errno = 0;

1274

ret = seteuid(uid);

1275

if(ret == -1){

1276

perror("seteuid");

1277

}

1084

1278

goto end;

1085

1279

}

1086

1280

strcpy(network.ifr_name, interface);

1096

1290

}

1097

1291

#endif /* __linux__ */

1098

1292

exitcode = EXIT_FAILURE;

1293

/* Lower privileges */

1294

errno = 0;

1295

ret = seteuid(uid);

1296

if(ret == -1){

1297

perror("seteuid");

1298

}

1099

1299

goto end;

1100

1300

}

1101

1301

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

1102

1302

network.ifr_flags |= IFF_UP;

1303

take_down_interface = true;

1103

1304

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

1104

1305

if(ret == -1){

1306

take_down_interface = false;

1105

1307

perror("ioctl SIOCSIFFLAGS");

1106

1308

exitcode = EXIT_FAILURE;

1107

1309

#ifdef __linux__

1112

1314

}

1113

1315

}

1114

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1115

1323

goto end;

1116

1324

}

1117

1325

}

1129

1337

perror("nanosleep");

1130

1338

}

1131

1339

}

1132

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

1133

if(ret == -1){

1134

perror("close");

1340

if(not take_down_interface){

1341

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

1342

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

1343

if(ret == -1){

1344

perror("close");

1345

}

1135

1346

}

1136

1347

#ifdef __linux__

1137

1348

if(restore_loglevel){

1142

1353

}

1143

1354

}

1144

1355

#endif /* __linux__ */

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");

1356

/* Lower privileges */

1357

errno = 0;

1358

if(take_down_interface){

1359

/* Lower privileges */

1360

ret = seteuid(uid);

1361

if(ret == -1){

1362

perror("seteuid");

1363

}

1364

} else {

1365

/* Lower privileges permanently */

1366

ret = setuid(uid);

1367

if(ret == -1){

1368

perror("setuid");

1369

}

1370

}

1371

}

1372

1373

if(quit_now){

1374

goto end;

1159

1375

}

1160

1376

1161

1377

ret = init_gnutls_global(pubkey, seckey);

1167

1383

gnutls_initialized = true;

1168

1384

}

1169

1385

1386

if(quit_now){

1387

goto end;

1388

}

1389

1390

tempdir_created = true;

1170

1391

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1171

1393

perror("mkdtemp");

1172

1394

goto end;

1173

1395

}

1174

tempdir_created = true;

1396

1397

if(quit_now){

1398

goto end;

1399

}

1175

1400

1176

1401

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

1177

1402

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

1181

1406

gpgme_initialized = true;

1182

1407

}

1183

1408

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

}

1409

if(quit_now){

1410

goto end;

1191

1411

}

1192

1412

1193

1413

if(connect_to != NULL){

1199

1419

exitcode = EXIT_FAILURE;

1200

1420

goto end;

1201

1421

}

1422

1423

if(quit_now){

1424

goto end;

1425

}

1426

1202

1427

uint16_t port;

1203

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

1204

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

1205

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

1428

errno = 0;

1429

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

1430

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

1431

or tmpmax != (uint16_t)tmpmax){

1206

1432

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

1207

1433

exitcode = EXIT_FAILURE;

1208

1434

goto end;

1209

1435

}

1436

1437

if(quit_now){

1438

goto end;

1439

}

1440

1210

1441

port = (uint16_t)tmpmax;

1211

1442

*address = '\0';

1212

1443

address = connect_to;

1217

1448

} else {

1218

1449

af = AF_INET;

1219

1450

}

1451

1452

if(quit_now){

1453

goto end;

1454

}

1455

1220

1456

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

1221

1457

if(ret < 0){

1222

1458

exitcode = EXIT_FAILURE;

1225

1461

}

1226

1462

goto end;

1227

1463

}

1228

1464

1465

if(quit_now){

1466

goto end;

1467

}

1468

1229

1469

{

1230

1470

AvahiServerConfig config;

1231

1471

/* Do not publish any local Zeroconf records */

1252

1492

goto end;

1253

1493

}

1254

1494

1495

if(quit_now){

1496

goto end;

1497

}

1498

1255

1499

/* Create the Avahi service browser */

1256

1500

sb = avahi_s_service_browser_new(mc.server, if_index,

1257

AVAHI_PROTO_INET6, "_mandos._tcp",

1501

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1258

1502

NULL, 0, browse_callback, NULL);

1259

1503

if(sb == NULL){

1260

1504

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

1263

1507

goto end;

1264

1508

}

1265

1509

1510

if(quit_now){

1511

goto end;

1512

}

1513

1266

1514

/* Run the main loop */

1267

1515

1268

1516

if(debug){

1297

1545

gpgme_release(mc.ctx);

1298

1546

}

1299

1547

1548

/* Take down the network interface */

1549

if(take_down_interface){

1550

/* Re-raise priviliges */

1551

errno = 0;

1552

ret = seteuid(0);

1553

if(ret == -1){

1554

perror("seteuid");

1555

}

1556

if(geteuid() == 0){

1557

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

1558

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

1561

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

1562

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

1563

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

1565

}

1566

}

1567

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

1568

if(ret == -1){

1569

perror("close");

1570

}

1571

/* Lower privileges permanently */

1572

errno = 0;

1573

ret = setuid(uid);

1574

if(ret == -1){

1575

perror("setuid");

1576

}

1577

}

1578

}

1579

1300

1580

/* Removes the temp directory used by GPGME */

1301

1581

if(tempdir_created){

1302

1582

DIR *d;

1341

1621

}

1342

1622

}

1343

1623

1624

if(quit_now){

1625

sigemptyset(&old_sigterm_action.sa_mask);

1626

old_sigterm_action.sa_handler = SIG_DFL;

1627

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1628

&old_sigterm_action,

1629

NULL));

1630

if(ret == -1){

1631

perror("sigaction");

1632

}

1633

do {

1634

ret = raise(signal_received);

1635

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

1636

if(ret != 0){

1637

perror("raise");

1638

abort();

1639

}

1640

TEMP_FAILURE_RETRY(pause());

1641

}

1642

1344

1643

return exitcode;

1345

1644

}